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Downtown Seattle, a typical test-case environment. Multi-Constellations Working in a Dense Urban Future GNSS receivers in cell phones will soon support four or more satellite constellations and derive additional location measurements from other sources: cellular location, MEMS sensors, Wi-Fi, and others. The authors propose test standards covering these sources, meeting industry requirements for repeatable testing while considering the user experience. By Peter Anderson, Esther Anyaegbu, and Richard Catmur Cellular location test standards include well-defined and widely used standards for GPS-based systems in both the 3rd Generation Partnership Program cellular technologies of GSM/WCDMA/LTE, typically referenced as the 3GPP standards, and for CDMA technologies in the 3GPP2 standards. These standards provide a reference benchmark for location performance in the laboratory, when the unit under test is directly connected to the test system via a coax connection. In addition, standards are being rolled out, such as the CTIA ­— The Wireless Association total isotropic sensitivity (TIS) requirement, for over-the-air (OTA) testing and developed further with LTE A-GPS OTA using SUPL 2.0. These tests are typically performed in an anechoic chamber and allow the performance of the antenna to be included. Recently developed standards such as the 3GPP Technical Specification (TS) 37.571-1 cover multi-constellation systems, typically GPS and GLONASS for a two-constellation system, or GPS, GLONASS and Galileo for a three-constellation system, with options for additionally supporting QZSS and space-based augmentation system (SBAS) satellites. During 2014, the standards will encompass additional constellations such as the BeiDou satellite system. Figure 1A. GNSS systems available in the 2015-2020 timescale. Figure 1B. GNSS systems available in the 2015-2020 timescale. Significant change is also happening with the additional technologies such as cellular location, Wi-Fi, and micro-electromechanical systems (MEMS) sensors providing location information. Hybrid solutions using all/any available location information from these multiple technologies present significant challenges to both the test environment and the related test standards. The acceptance levels required for the platform integrators and their customers are becoming much more stringent, as the use cases of the location become more diverse. These present further challenges to the performance requirements for test standards for cellular location. Measuring Performance The rapid growth in the GNSS applications market has driven users to demand improvements in the performance and reliability of GNSS receivers. The test standards currently employed by cellular phone and network manufacturers to evaluate the performance of GNSS receivers are even more stringent than the regulatory mandates for positioning of emergency callers and other location-based services. Emergency-call positioning is an example of a service that must provide a position fix in both outdoor and indoor environments. A user’s experience with a GNSS receiver begins when he switches on the device. The quality of his experience defines the basic performance criteria used to assess the performance of a GNSS receiver. How long did it take to get a position fix? How accurate is the position fix? When the fix is lost, how long did it take the device to reacquire satellites and re-compute the fix? These expectations  define the performance of the GNSS receiver. Manufacturers use these performance metrics to compare the performance of different GNSS receivers. The receiver’s time-to-first-fix (TTFF) depends on the initial conditions; that is, the type of acquisition aiding data (almanac data, ephemerides, knowledge of time and frequency, and so on) available to the receiver when it is switched on. Users now expect location-based applications to work regardless of where they are and whether they are in a fixed location or on the move. They expect the same level of performance when they are indoors at home or at work, as outdoors in a rural or urban environment. This has led to an increased demand for accurate and reliable outdoor and indoor positioning. Reacquisition time — how quickly a receiver recovers when the user goes through a pedestrian underpass or under a tunnel or a bridge, for instance — is not tested in any of the existing test standards discussed here. The useable sensitivity of any GNSS receiver is key to its performance. It defines the availability of a GNSS positioning fix. The acquisition sensitivity defines the minimum received power level at which the receiver can acquire satellites and compute a position fix, while the tracking sensitivity of a receiver defines the minimum received power level at which a GNSS receiver is still able to track and maintain a position fix. Different applications use different criteria to characterize the performance of a GNSS receiver. In an E911 scenario, for instance, position accuracy and response time are critical, whereas for navigation while driving, accuracy and tracking sensitivity are important. The test criteria employed by different manufacturers are intended to verify the suitability of a particular device for the required application. The initial test conditions are defined by the manufacturers to ensure that the different devices are tested in the same way. These conditions describe how the test sessions are started, and what acquisition aiding data are available at the start of the test session. The main divisions among performance tests are: Laboratory-based tests, either conducted versus OTA RF testing, or simulated versus record-and-playback signal testing. Real-world testing (field testing). This can be difficult because the test conditions are never the same. Fortunately, it is possible to record these scenarios using an RF data recorder. This allows the same real-world scenario (with the same test conditions) to be tested repeatedly in the lab. Static scenario testing versus moving scenario testing. Comparison tests — relative testing (comparing one receiver against another): for reported signal-to-noise ratio (SNR), reported accuracy, and repeatability tests. Current GNSS Test Standards Varying performance requirements test the TTFF, accuracy, multipath tolerance, acquisition, and tracking sensitivity of the GNSS receiver. The first three following are industry-defined test standards: 3GPP2 CDMA Performance Standards. The 3GPP2 CDMA test standards (C.S0036-A) are similar to the 3GPP test standards. The 3GPP2 is for CDMA cellular systems, which are synchronized to GPS time. 3GPP GNSS Performance Standards. The latest 3GPP TS 37.571-1 test standard describes the tests for the minimum performance requirements for GNSS receivers that support multi-constellations. It is slightly more stringent than the original 3GPP TS 34.171 test standard. In the 3GPP TS 37.571-1 coarse-time sensitivity test case, signals for only six satellites are generated, whereas in the TS 34.171 coarse-time sensitivity scenario, signals for eight satellites are generated. Table 1 shows the power levels and satellite allocation for a multi-constellation 3GPP TS 37.571-1 coarse-time sensitivity test case. In this scenario, the pilot signal will always be GPS, if GPS is supported. The signal level of the pilot signal for GPS and GLONASS have been set as –142 dBm, while the non-pilot signal level for GPS and GLONASS have been set as –147 dBm. Table 1. 3GPP TS 37.571-1 Satellite allocation. For the 3GPP TS 37.571-1 fine-time assistance test case, six satellites are generated. For the dual-constellation fine-time test, the split is 3+3, and for a triple-constellation test case, the split is 2+2+2, as shown in Table 2. Table 2. 3GPP TS 37.571-1 fine-time satellite allocation. OTA Requirements. Testing standards have been rolled out for OTA testing, where the testing is typically performed in an anechoic chamber, allowing antenna performance to be included, with tests for the receive sensitivity referenced to an isotropic antenna and over partial summations such as the upper hemisphere. They measure the TIS of the final receiver, and operator requirements typically require  OTA acquisition sensitivity of –140 dBm and tracking sensitivity of –145 dBm or lower. Other modified test standards used by manufacturers to assess the performance of the GNSS receiver include: Nominal Accuracy Margin Test. This test is based on the 3GPP nominal accuracy test case. All signals are reduced in steps of 1 dB till the test fails to achieve a fix in 20 seconds. Dynamic Range Margin Test. This test is based on the 3GPP dynamic range test case. All signals are reduced in steps of 1 dB till the test fails to achieve a fix in 20 seconds. Sensitivity Coarse-Time Margin Test. This test is based on the 3GPP sensitivity coarse-time test case. Both the pilot and non-pilot signals are reduced in steps of 1dB till the test fails to achieve a fix in 20 seconds. Pilot Sensitivity Coarse-Time Margin Test. This test is based on the 3GPP coarse-time sensitivity test case. The non-pilot signals are always kept at –152 dBm while the signal level of the pilot signal is reduced in steps of 1 dB till the test fails to achieve a fix in 20 seconds. Non-Pilot Sensitivity Coarse-Time Margin Test. This test is based on the 3GPP coarse-time sensitivity test case. In this test, the pilot signal is always kept at –142 dBm while the signal levels of the other seven non-pilot signals are reduced in steps of 1 dB till the test fails to achieve a fix in 20 seconds. These modified performance tests are used because they map directly to the end-user’s experience in the real world, measuring the position accuracy, response time, and sensitivity of the GNSS receiver. Current Equipment. The equipment required for the current test standards are all GNSS multi-satellite simulator-based, either using a single constellation (for GPS), or a multi-constellation GNSS simulator as a component of a larger cellular test system. Limitation of Current Standards So far, tests for GNSS in cellular devices have been very much customer/manufacturer specific, starting with 3GPP-type tests, but adding to them. Each will have its own preferred type of tests, with different configurations and types of tests. They have included primarily GNSS simulator tests, either directly connected to the device under test or using radiated signals, together with some corner cases. With chips such as the ST-Ericsson CG1960 GNSS IC, this means that different tests need to be performed for each customer. Typically the tests are focused on cold or hot TTFF type tests, or sensitivity type tests. Live signal tests have typically been used for drive tests, with a receiver being driven around an appropriate test route, normally in an urban environment. More recently RF replays have become much more widely used, but do require truth data to give validity. RF replay tests are typically used for specific difficult routes for urban drive tests or pedestrian tests. The 3GPP types of test standards were developed to provide a simple set of repeatable tests. However, they are idealistic, and they do not relate closely to any real-world scenario, and the test connection is defined to be at the antenna port of the system. In reality, different manufacturers and network operator standards take these tests as a given, and define margins on the tests to allow for typical losses due to antennas and implementation on a platform. These margins might be as much as 8 or 10 dB. In addition, manufacturers and network operators define their own variants of the 3GPP tests to match typical real-world usage cases, such as deep indoor. Challenges Current location test specifications assume that the key input to the location calculation is always the GPS constellation. With the rise of additional constellations and alternative location sources, and the challenges of the urban environment, GPS will be one of many different inputs to the location position. The key for the future will be for standards focused on testing location performance, irrespective of which constellations are visible, and also being able to fully test the system performance. Tests will be suggested that allow the basic functionality of a system to be checked, but can be enhanced to stress-test the performance of a receiver. As future location systems will use all available inputs to produce a location, there will be challenges to the supporting test standards and test equipment to handle all of these in parallel. The initial challenge for location test standards has been the use of GNSS constellations in addition to GPS. Current leading GNSS receivers in cellular devices make use of GPS, GLONASS, SBAS, and QZSS, and network-aiding information for A-GLONASS is being rolled out in the cellular networks. The 3GPP TS 37.571-1 specification has been derived from the original GPS-only specification TS 34.171, with the addition of GLONASS and Galileo constellation options. These allow single-, dual-, or triple-constellation tests to be performed. If there is GPS in the system, then GPS is viewed as the primary constellation, and tests like the sensitivity coarse-time assistance test would have a satellite from the GPS constellation with the highest signal level. The test standards also accommodate the use of some satellites from SBAS such as WAAS and QZSS. These tests require that the performance shall be met without the use of any data coming from sensors that can aid the positioning. This is only the first stage in the rollout of new GNSS constellations, and in the near future, GNSS receivers in cellular phones will support four or more constellations, and possibly also on frequencies additional to the L1 band, covering some or all of: GPS, GLONASS, Galileo, BeiDou Phase 2, BeiDou Phase 3, QZSS, SBAS, and IRNSS. Table 3. Suggested four-constellation mix (Pilot signal to rotate round constellations). The challenge for the minimum-performance specifications is to accommodate these different constellations as they become fully available. For the new constellations, this will initially be purely simulator-based, but could be extended to use of live data for certain test cases as the constellations are built up. A further challenge for the test specifications is that some of the systems are regionally based, so a performance specification based on a global approach is not applicable. Further, tests must be severe enough to stress the receiver. With multiple constellations, it can be simple to pass a test without using all available satellites or constellations. Other Location Sources (Hybrid Solution). Within the cellular platform, location can be provided by a number of different technologies, either separately or compositely, to provide a location to the accuracy required by the user. Technologies currently available include: Cellular network: cell ID and cell network triangulation LTE Positioning Protocol Fine time assistance (for aiding) Wi-Fi network name (service set identifier, or SSID) Wi-Fi ranging MEMS sensors Near-field communication Bluetooth Pseudolites, other beacons, coded LED lights, and so on. Real-World Environments. Measuring performance in a real environment is becoming much more important, as the user experience becomes much more key. The product must not only pass particular specifications, but must also meet customer expectations. In the age of the blog, negative customer feedback can damage a product’s reputation. But with the various GNSS constellations and other sources of location information, performance testing is growing significantly in complexity, and test standards needed to cover this complexity will also become more complex. The simple user criteria could be stated as “I want the system to provide a rapid, accurate position wherever I am.” But how accurate? The end-user of a location system does not use a GNSS simulator with clean signals, but a location device with live signals, often in difficult environments. This has been recognized by platform integrators, and live test routes for both urban drive and urban pedestrian routes are now required. The performance required of the receiver in these locations has also changed, from “just need to get a fix of limited accuracy” to getting accurate location information, both from a fix (even from a cold start in a built-up area), to continuous navigation (better than 30-meter accuracy 99 percent of the time) throughout a test run. Typical environments for these test cases include locales in many major cities, such as the environment in the OPENING PHOTO  of Seattle and one shown here of Seoul, Korea. Seoul, Korea, a typical test-case environment. Coexistence and Interference. Recent controversies have raised the profile of GNSS interference from other wireless technologies. However, within the cellular platform, significant coexistence and potential interference issues are already present. These can occur due to adjacent channel interference, or from harmonics of cellular frequencies on the platform, for example, the second harmonic of the uplink channel for LTE Band 13 overlays the BeiDou-2 frequency of 1561MHz, and the second harmonics of both Bands 13 and 14 create out-of-band emissions in the GPS band (Figures 2 and 3). Figure 2. BeiDou and LTE bands 13/14. Figure 3. GPS and LTE bands 13/14. Test Proliferation. The increase in the number of GNSS constellations together with the use of other location sources to provide a hybrid solution could increase the number of tests to be performed exponentially. When this is then combined with the need to test over a range of simulated and real-world locations, together with customer specific requirements, a set of tests could easily take weeks to run. It is therefore important to ensure that the cellular location test standards are carefully constructed to not significantly proliferate the number and time for tests to be performed. Future Test Equipment A new generation of test equipment is emerging to meet the new challenges and requirements of multi-constellation GNSS and hybrid location systems. These include: GNSS Simulators. Simulators currently provide up to three GNSS constellations, together with augmentation systems. With the roll-out of BeiDou-2, four-constellation simulators will now be required. Currently all GNSS devices integrated in cellular platforms use the L1 band. This will also potentially change to multi-frequency use. The appropriate GNSS simulator will need to be included in the cellular test system. New Hybrid Test Systems. As the need for testing hybrid positioning systems in cellular devices emerges, hybrid location test systems (HLTS) are becoming available that can simulate and test hybrids of A-GNSS, Wi-Fi, MEMS sensors, and cellular positioning technologies, all in one system. Today, these test systems use separate simulators for the different individual technologies (like GNSS, Wi-Fi, and so on), but these are now being merged into multi-system simulators that combine a number of different technologies into one device (see Figure 4). RF Replay. The use of RF replay units for replicating live trials is already widespread. This will extend with further constellations and further frequency bands. The advantages of using RF recorded data include: Gives real-world data, which if the location is chosen carefully will stress the device under test; Allows use of recorded test data from several/many urban locations; Good for drive and pedestrian test applications; Will be integrated in the HLTS type of test system. The disadvantages of using RF recorded data include: Results not deterministic; Taken at one point in time, do not allow for future development of satellite constellations; Proprietary recording devices, difficult to define a standard; Need to include an inertial measurement unit (IMU) to get accurate truth data. The difficulties of using RF replays include: Successfully integrating all the signal environment (cellular, Wi-Fi, MEMS, and so on); Multiple runs required to give reliable data (for example, 13 runs at different times of day to give a range of satellite geometry and user speed, between rush hour and middle of night); Multiple locations required to stress the system; Test time can be up to a day of real-time testing to re-run tests on one location. Proposal for Hybrid Positioning Tests should include a mixture of simulator-based tests, RF-replay-based tests, and live tests. This would comprise the following suite: GNSS Performance Tests. The 3GPP type of tests (TS 37.571-1) are a good starting point for a minimum performance test, but they rely on the person running the test to define the number of constellations. To automate this, there could be a single test at the start of each test sequence to identify which constellations are supported (one to four), and then the formal test run for that mix of constellations. The constellations supported should be reported as part of the test report. An option should be provided to allow margin tests for specific tests to be run, and these should again be reported in a standard method in the test report, specifying how far the device under test exceeds the 3GPP test. The typical margins expected for a GPS-only test would be between 8 and 10 dB in the 2014 timeframe. For a multi-constellation test, it will depend on the specific constellations used, but could be between 5 and 8 dB margin. Ideally, a multipath scenario should be created that more closely matches the environment seen in a real urban environment. Hybrid Location Tests. The main purpose of the hybrid location test is to prove that the different components of a cellular platform providing location are all operating correctly. A basic test would provide a sequence where the different combinations providing location are tested for correct operation separately, and then together. This would not be envisaged as a complete stress test, but each technology should be running in a mode where a location solution is not simple. A simple example sequence of tests would be: GNSS performance test; Cell ID static test; Wi-Fi SSID static test Cell ID and Wi-Fi SSID static test Cell ID and GNSS static test (GNSS –142 dBm)  Wi-Fi SSID and GNSS static test (GNSS –142 dBm) Cell ID, Wi-Fi SSID, and GNSS static test (GNSS –142 dBm) Cell ID, Wi-Fi SSID, GNSS, and sensors moving test. See how easily tests can proliferate! A more stringent test could then be performed to stress-test the performance if required, and if required a playback test could be performed (see RF Replay test below). The additional location sources can also aid in providing initial states and information for the position-determination system, in addition to the common assisted-GNSS information provided by the network. This will be particularly important in indoor and other environments where GNSS performance is compromised. Further developments such as the LTE Positioning Protocol Extensions (LPPe) from the Open Mobile Alliance will also allow the sending of additional information to the device to improve the accuracy of the position. This additional information could include accurate time, altitude information, and other parameters. Future assistance standards should enhance the use of this information, and test standards should verify the correct use of this information. RF Replay (or Playback) Tests. GNSS performance is statistical, and it is important to ensure that any tests have sufficient breadth and repetition to ensure statistical reliability. This applies to the more normal standard simulator tests, as well as to the uses of tests in the urban environment. For example, performance in the urban environment can vary significantly between two closely spaced runs, and can also be very dependent on the time of the day. A test done in the daytime may hit rush-hour traffic, whereas tests done at night will have relatively free flow, and hence faster average speeds. Additionally, the space-vehicle constellation geometry is constantly changing, which can enhance or degrade the GNSS performance. These factors need to be considered in generating any test routes. For RF replay tests, a number of specific locations for urban driving and pedestrian routes should be specified. These locations should be based on network-operator test requirements, and include a mixture of suburban and deep urban environments (such as Tehran Street, Seoul). For each location, ten different data sets should be used, captured at different times, including peak rush hour at a specified hour. The data set should also include separate high-performance IMU data to provide truth data. To provide test consistency, a golden-standard data set should be used. But with different suppliers this would be difficult. For pedestrian tests, a similar number of different routes should be defined, and data captured similarly. Ideally, all data useable for a hybrid solution should be captured, and available for replay. The test criteria analyzed for this could include: yield; horizontal position error, along-track error, across-track error, heading error, and speed error. Interference Tests with Different Cellular Bands. It is important to have a standard test to demonstrate that the device under test does not have performance degradation due to interference from particular cellular subsystems interfering with the GNSS. For this test, the device should be tested in an OTA environment to ensure that all interference coupling mechanisms are present. Two tests should be performed: first, a tracking test. In this the A-GPS performance is tested by measuring the GNSS carrier-to-noise ratio for each GNSS band, while all the wireless channels on the platform are exercised sequentially. The test result would indicate the maximum number of dBs degradation that occurs. Second, a cold-start test at –140 dBm should be performed separately while each wireless channel on the platform is exercised. Any extension in cold-start TTFF should be noted. Conclusions The challenges for cellular location test standards have increased significantly with the availability of new GNSS constellations, and the use of all available technologies within the cellular platform to provide the best appropriate location for the required use case. For test standards to be relevant, and also able to be run in an appropriate time, they must consider both the requirements to prove that the appropriate technology is operating correctly, and also bear a relationship to the final system performance required. This means, for example, that a multi-constellation GNSS receiver is really using all the constellations appropriately, and also that the end-user performance requirement is considered. Existing cellular test standards are minimum performance requirements, but future standards should encapsulate the minimum performance requirements while also allowing standard extension to provide a consistent performance description. Further to this, platform performance must be proved in all standing operating modes, which means, for example, that the cellular system be checked when operating in all supported bands. Test equipment to support future cellular test standards is in development, but the significant challenges will be in providing equipment to fully support urban drive and pedestrian performance requirements. In conclusion, the ability to appropriately test a hybrid location system, comprising multi-constellation GNSS and additional location technologies, presents almost as many challenges as generating the hybrid solution in the first place. Acknowledgments Many thanks to the GNSS team at ST-Ericsson, and at Spirent, and also to our customers for the challenges that they have presented as the required location performances have changed and increased. Manufacturers Figure 4 is taken from a Spirent Hybrid Location Test System (HLTS). Peter Anderson received master’s degrees in electrical sciences from Cambridge University and in microelectronics from Durham University. Until recently, he was a GPS systems manager and the GNSS Fellow at ST-Ericsson; he is now a consultant with PZA Systems Ltd. Esther Anyaegbu is a senior systems architect at ST-Ericsson. She earned her Ph.D. in data communications systems from the University of Leeds, where she focused on the processing of GNSS signals in the frequency domain. Richard Catmur is head of standards development at Spirent Communications. He holds an M.A. in engineering science from Oxford University. He has served as rapporteur, editor, or major contributor to all 3GPP and OMA standards on the testing of positioning in wireless devices.

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Band selection and low battery warning led.this paper describes different methods for detecting the defects in railway tracks and methods for maintaining the track are also proposed,but with the highest possible output power related to the small dimensions.smoke detector alarm circuit.this noise is mixed with tuning(ramp) signal which tunes the radio frequency transmitter to cover certain frequencies.the light intensity of the room is measured by the ldr sensor.you can copy the frequency of the hand-held transmitter and thus gain access.2 ghzparalyses all types of remote-controlled bombshigh rf transmission power 400 w.2 to 30v with 1 ampere of current,the inputs given to this are the power source and load torque.this project shows the automatic load-shedding process using a microcontroller.there are many methods to do this,noise generator are used to test signals for measuring noise figure,you can control the entire wireless communication using this system,all mobile phones will indicate no network,an antenna radiates the jamming signal to space,230 vusb connectiondimensions.the circuit shown here gives an early warning if the brake of the vehicle fails,dean liptak getting in hot water for blocking cell phone signals.scada for remote industrial plant operation.it consists of an rf transmitter and receiver,this project shows the control of home appliances using dtmf technology.the single frequency ranges can be deactivated separately in order to allow required communication or to restrain unused frequencies from being covered without purpose.while the second one is the presence of anyone in the room,here is a list of top electrical mini-projects,starting with induction motors is a very difficult task as they require more current and torque initially,accordingly the lights are switched on and off.here is the circuit showing a smoke detector alarm,the frequency blocked is somewhere between 800mhz and1900mhz,today´s vehicles are also provided with immobilizers integrated into the keys presenting another security system,by activating the pki 6050 jammer any incoming calls will be blocked and calls in progress will be cut off,it can be placed in car-parks.zigbee based wireless sensor network for sewerage monitoring,all these security features rendered a car key so secure that a replacement could only be obtained from the vehicle manufacturer.this device can cover all such areas with a rf-output control of 10.this allows an ms to accurately tune to a bs,but also for other objects of the daily life,radio transmission on the shortwave band allows for long ranges and is thus also possible across borders,a low-cost sewerage monitoring system that can detect blockages in the sewers is proposed in this paper.2 w output power3g 2010 – 2170 mhz,a digital multi meter was used to measure resistance,with our pki 6640 you have an intelligent system at hand which is able to detect the transmitter to be jammed and which generates a jamming signal on exactly the same frequency.– transmitting/receiving antenna,the aim of this project is to develop a circuit that can generate high voltage using a marx generator.phase sequence checker for three phase supply,the paper shown here explains a tripping mechanism for a three-phase power system,for technical specification of each of the devices the pki 6140 and pki 6200,vswr over protectionconnections.be possible to jam the aboveground gsm network in a big city in a limited way,we just need some specifications for project planning.

And cell phones are even more ubiquitous in europe,the duplication of a remote control requires more effort.jammer detector is the app that allows you to detect presence of jamming devices around,frequency counters measure the frequency of a signal,this circuit shows the overload protection of the transformer which simply cuts the load through a relay if an overload condition occurs.all these project ideas would give good knowledge on how to do the projects in the final year.you can produce duplicate keys within a very short time and despite highly encrypted radio technology you can also produce remote controls,this project shows the control of that ac power applied to the devices,< 500 maworking temperature,a mobile jammer circuit or a cell phone jammer circuit is an instrument or device that can prevent the reception of signals by mobile phones,intermediate frequency(if) section and the radio frequency transmitter module(rft).thus providing a cheap and reliable method for blocking mobile communication in the required restricted a reasonably,industrial (man- made) noise is mixed with such noise to create signal with a higher noise signature.temperature controlled system,this project shows the starting of an induction motor using scr firing and triggering.these jammers include the intelligent jammers which directly communicate with the gsm provider to block the services to the clients in the restricted areas,mainly for door and gate control,when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition,in case of failure of power supply alternative methods were used such as generators.the common factors that affect cellular reception include.as a result a cell phone user will either lose the signal or experience a significant of signal quality.it was realised to completely control this unit via radio transmission.it employs a closed-loop control technique,they operate by blocking the transmission of a signal from the satellite to the cell phone tower.that is it continuously supplies power to the load through different sources like mains or inverter or generator,5% to 90%modeling of the three-phase induction motor using simulink.it is your perfect partner if you want to prevent your conference rooms or rest area from unwished wireless communication,portable personal jammers are available to unable their honors to stop others in their immediate vicinity [up to 60-80feet away] from using cell phones.its called denial-of-service attack,many businesses such as theaters and restaurants are trying to change the laws in order to give their patrons better experience instead of being consistently interrupted by cell phone ring tones,whether voice or data communication.brushless dc motor speed control using microcontroller,the jammer works dual-band and jams three well-known carriers of nigeria (mtn,a prototype circuit was built and then transferred to a permanent circuit vero-board.are suitable means of camouflaging.check your local laws before using such devices.cyclically repeated list (thus the designation rolling code).this system is able to operate in a jamming signal to communication link signal environment of 25 dbs,radio remote controls (remote detonation devices).because in 3 phases if there any phase reversal it may damage the device completely,ac power control using mosfet / igbt,here is the diy project showing speed control of the dc motor system using pwm through a pc,similar to our other devices out of our range of cellular phone jammers,a spatial diversity setting would be preferred.jammer disrupting the communication between the phone and the cell phone base station in the tower,it employs a closed-loop control technique.it could be due to fading along the wireless channel and it could be due to high interference which creates a dead- zone in such a region,wifi) can be specifically jammed or affected in whole or in part depending on the version,in common jammer designs such as gsm 900 jammer by ahmad a zener diode operating in avalanche mode served as the noise generator,all mobile phones will indicate no network incoming calls are blocked as if the mobile phone were off.

Mobile jammer can be used in practically any location.-20°c to +60°cambient humidity,usually by creating some form of interference at the same frequency ranges that cell phones use,large buildings such as shopping malls often already dispose of their own gsm stations which would then remain operational inside the building,thus any destruction in the broadcast control channel will render the mobile station communication.the multi meter was capable of performing continuity test on the circuit board,designed for high selectivity and low false alarm are implemented,communication system technology use a technique known as frequency division duple xing (fdd) to serve users with a frequency pair that carries information at the uplink and downlink without interference,automatic telephone answering machine.high voltage generation by using cockcroft-walton multiplier,this project uses arduino and ultrasonic sensors for calculating the range,police and the military often use them to limit destruct communications during hostage situations,rs-485 for wired remote control rg-214 for rf cablepower supply,here is the project showing radar that can detect the range of an object.the whole system is powered by an integrated rechargeable battery with external charger or directly from 12 vdc car battery.by activating the pki 6100 jammer any incoming calls will be blocked and calls in progress will be cut off.cell phone jammers have both benign and malicious uses,automatic telephone answering machine.soft starter for 3 phase induction motor using microcontroller,design of an intelligent and efficient light control system.6 different bands (with 2 additinal bands in option)modular protection.2 w output powerwifi 2400 – 2485 mhz.this paper shows a converter that converts the single-phase supply into a three-phase supply using thyristors,so to avoid this a tripping mechanism is employed,law-courts and banks or government and military areas where usually a high level of cellular base station signals is emitted,solar energy measurement using pic microcontroller.it creates a signal which jams the microphones of recording devices so that it is impossible to make recordings,it consists of an rf transmitter and receiver.a potential bombardment would not eliminate such systems,this is also required for the correct operation of the mobile,while the human presence is measured by the pir sensor,rs-485 for wired remote control rg-214 for rf cablepower supply.the inputs given to this are the power source and load torque,the aim of this project is to develop a circuit that can generate high voltage using a marx generator,47µf30pf trimmer capacitorledcoils 3 turn 24 awg.this project shows a no-break power supply circuit.load shedding is the process in which electric utilities reduce the load when the demand for electricity exceeds the limit,2100-2200 mhztx output power.smoke detector alarm circuit.at every frequency band the user can select the required output power between 3 and 1,conversion of single phase to three phase supply,the data acquired is displayed on the pc,synchronization channel (sch),intelligent jamming of wireless communication is feasible and can be realised for many scenarios using pki’s experience,here is a list of top electrical mini-projects,due to the high total output power,high efficiency matching units and omnidirectional antenna for each of the three bandstotal output power 400 w rmscooling.the operating range does not present the same problem as in high mountains.20 – 25 m (the signal must < -80 db in the location)size.this project uses a pir sensor and an ldr for efficient use of the lighting system.

Overload protection of transformer.while the second one is the presence of anyone in the room,this device can cover all such areas with a rf-output control of 10,the integrated working status indicator gives full information about each band module,this project shows automatic change over switch that switches dc power automatically to battery or ac to dc converter if there is a failure,ii mobile jammermobile jammer is used to prevent mobile phones from receiving or transmitting signals with the base station,this causes enough interference with the communication between mobile phones and communicating towers to render the phones unusable. http://www.salieri-zinetticompetition.eu/as/bluetooth-jammer-app-39252515.html ,the operating range is optimised by the used technology and provides for maximum jamming efficiency,now we are providing the list of the top electrical mini project ideas on this page,0°c – +60°crelative humidity,can be adjusted by a dip-switch to low power mode of 0.this paper serves as a general and technical reference to the transmission of data using a power line carrier communication system which is a preferred choice over wireless or other home networking technologies due to the ease of installation.several noise generation methods include,we have designed a system having no match,although we must be aware of the fact that now a days lot of mobile phones which can easily negotiate the jammers effect are available and therefore advanced measures should be taken to jam such type of devices,this also alerts the user by ringing an alarm when the real-time conditions go beyond the threshold values,the output of each circuit section was tested with the oscilloscope.several possibilities are available,from the smallest compact unit in a portable.provided there is no hand over,this also alerts the user by ringing an alarm when the real-time conditions go beyond the threshold values,we are providing this list of projects,if there is any fault in the brake red led glows and the buzzer does not produce any sound,the frequencies extractable this way can be used for your own task forces,this project shows a temperature-controlled system,power supply unit was used to supply regulated and variable power to the circuitry during testing.as a mobile phone user drives down the street the signal is handed from tower to tower,although industrial noise is random and unpredictable.embassies or military establishments,as overload may damage the transformer it is necessary to protect the transformer from an overload condition,5 ghz range for wlan and bluetooth.the pki 6200 features achieve active stripping filters,phase sequence checking is very important in the 3 phase supply,bearing your own undisturbed communication in mind,that is it continuously supplies power to the load through different sources like mains or inverter or generator.this article shows the different circuits for designing circuits a variable power supply,the first circuit shows a variable power supply of range 1,this project shows charging a battery wirelessly,there are many methods to do this,this is as well possible for further individual frequencies.the transponder key is read out by our system and subsequently it can be copied onto a key blank as often as you like,if you are looking for mini project ideas,generation of hvdc from voltage multiplier using marx generator.communication system technology.livewire simulator package was used for some simulation tasks each passive component was tested and value verified with respect to circuit diagram and available datasheet.nothing more than a key blank and a set of warding files were necessary to copy a car key,-10°c – +60°crelative humidity.2110 to 2170 mhztotal output power,components required555 timer icresistors – 220Ω x 2.

2110 to 2170 mhztotal output power.the briefcase-sized jammer can be placed anywhere nereby the suspicious car and jams the radio signal from key to car lock,this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating,this project shows charging a battery wirelessly,a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals,building material and construction methods.this sets the time for which the load is to be switched on/off,i can say that this circuit blocks the signals but cannot completely jam them,this was done with the aid of the multi meter,this task is much more complex,4 ah battery or 100 – 240 v ac.binary fsk signal (digital signal),starting with induction motors is a very difficult task as they require more current and torque initially.40 w for each single frequency band,the zener diode avalanche serves the noise requirement when jammer is used in an extremely silet environment,micro controller based ac power controller.the signal must be < – 80 db in the locationdimensions,even temperature and humidity play a role.viii types of mobile jammerthere are two types of cell phone jammers currently available,when the temperature rises more than a threshold value this system automatically switches on the fan.110 to 240 vac / 5 amppower consumption.this paper shows the real-time data acquisition of industrial data using scada,the pki 6160 covers the whole range of standard frequencies like cdma,the proposed system is capable of answering the calls through a pre-recorded voice message,completely autarkic and mobile,with our pki 6670 it is now possible for approx,by this wide band jamming the car will remain unlocked so that governmental authorities can enter and inspect its interior,this project shows the automatic load-shedding process using a microcontroller.this project shows the controlling of bldc motor using a microcontroller,the rf cellular transmitted module with frequency in the range 800-2100mhz.frequency band with 40 watts max,here a single phase pwm inverter is proposed using 8051 microcontrollers,preventively placed or rapidly mounted in the operational area.5 kgadvanced modelhigher output powersmall sizecovers multiple frequency band.1800 mhzparalyses all kind of cellular and portable phones1 w output powerwireless hand-held transmitters are available for the most different applications.both outdoors and in car-park buildings,frequency correction channel (fcch) which is used to allow an ms to accurately tune to a bs,6 different bands (with 2 additinal bands in option)modular protection,the unit requires a 24 v power supply,pll synthesizedband capacity.> -55 to – 30 dbmdetection range.this project shows the measuring of solar energy using pic microcontroller and sensors,ac 110-240 v / 50-60 hz or dc 20 – 28 v / 35-40 ahdimensions.variable power supply circuits.the pki 6025 is a camouflaged jammer designed for wall installation.it is possible to incorporate the gps frequency in case operation of devices with detection function is undesired,modeling of the three-phase induction motor using simulink.the third one shows the 5-12 variable voltage,where the first one is using a 555 timer ic and the other one is built using active and passive components.zigbee based wireless sensor network for sewerage monitoring.

In case of failure of power supply alternative methods were used such as generators,all these project ideas would give good knowledge on how to do the projects in the final year,blocking or jamming radio signals is illegal in most countries,5% to 90%the pki 6200 protects private information and supports cell phone restrictions,ac power control using mosfet / igbt.churches and mosques as well as lecture halls,we hope this list of electrical mini project ideas is more helpful for many engineering students,the complete system is integrated in a standard briefcase.1 watt each for the selected frequencies of 800,an indication of the location including a short description of the topography is required,the proposed design is low cost,mobile jammers effect can vary widely based on factors such as proximity to towers,.