Gps tracker signal jammer software - gps tracker anti jammer security
Permanent Link to Multi-Sensor, Multi-Network Positioning
By Ruizhi Chen, Heidi Kuusniemi, Yuwei Chen, Ling Pei, Wei Chen, Jingbin Liu, Helena Leppäkoski, Jarmo Takala
Currently, no single technology, system, or sensor can provide a positioning solution any time, anywhere. The key is to utilize multiple technologies. We are now exploring a multi-sensor multi-network (MSMN) approach for a seamless indoor-outdoor solution. Its hardware platform is described in the previous article. The digital signal processor (DSP) is embedded in the GPS module. All sensors are integrated to the DSP that hosts core software for real-time sensor data acquisition and real-time processing to estimate user location. A smartphone handset provides wireless network measurements.
Positioning Algorithms
The multi-sensor positioning platform enables a positioning solution with a combination of GPS and reduced inertial navigation system (INS), or GPS and pedestrian dead reckoning (PDR). The reduced INS consists of a 3D accelerometer and a 2D digital compass, as a low-cost alternative to augment GNSS positioning. The reduced INS combined with GPS uses a loosely coupled Kalman filter for data integration, while the combination of PDR and GPS uses algorithms for estimating the position change with pedestrian step-length estimation.
PDR. The PDR solution uses human physiological characteristics, implemented in a local-level frame, with equations:
where k denotes the current epoch, Y is the coordinate in East direction, X is the coordinate in North direction, S is step length, and φ is the heading.
The PDR positioning algorithm includes step detection, step length estimation, determination of heading, and positioning.
To achieve an accurate heading, compass measurements are corrected with an empirical online estimated error model, which requires some training data.
WLAN and Bluetooth. Figure 1 describes the basic concept of the WLAN or Bluetooth locating solution using a fingerprint database approach. The circles around the access point (AP) in the figure represent the radio coverage area and the color the signal strength. This radio map is a simplified example representing measurements from just one AP.
FIGURE 1. Sample WLAN or Bluetooth fingerprint map, in meters.
For the fingerprinting approach, the received signal strength indicators (RSSIs) are the basic observables. The whole process consists of a training phase and a positioning phase. During the training phase, a radio map of probability distribution of the received signal strength is constructed for the targeted area. The targeted area is divided into a matrix of grids, and the central point of each grid is referred to as a reference point. The probability distribution of the received signal strength at each reference point is represented by a Weibull function, and the parameters of the Weibull function are estimated with the limited number of training observation samples. Based on the constructed radio map, the positioning phase determines the current location using the measured RSSI observations in real time.
Given the observation vector , the problem is to find the most probable location (l) with the maximized conditional probability , maximized by Bayesian theorem as:
We applied an assumption of Hidden Markov Models (HMM) to represent the pedestrian movement process. The locating problem is then translated into finding such a state sequence (locations) that is most likely to have generated the output sequence (the measured RSSIs) assuming the given HMM model. The Viterbi algorithm typically solves these kinds of problems efficiently. This study also utilizes the Viterbi algorithm to trace the user trajectory.
MSMN. The general integration scheme combining the GPS output, sensor measurements, WLAN, or Bluetooth output, and their variance estimates is depicted in Figure 2. A simplified representation of the central filter combining different input sources can be described with typical Kalman filter equations. The measurement model is zk= Hkxk+vk where the state estimate vector is ,
with X, Y, and φ as previously defined, and S the user horizontal velocity (speed). The measurement vector is given as
where g refers to GPS, W to WLAN/Bluetooth, acc to accelerometer, and dc to digital compass. The matrix Hk is the design matrix of the system and the vector vk is the measurement error vector.
FIGURE 2. Integration scheme for multi-sensor, multi-network positioning approach
The recursive sequence includes prediction and update steps. The prediction step includes the typical equations of
and
while the update step includes
Indoor Test Results
A field test has been carried out on a sports field, described in the accompanying article (see Going 3D). An indoor test was carried out in an office-building corridor, but the test started and ended in an outdoor terrace area. During the test, the indoor corridor was covered with eight WLAN and three BT APs.
Figure 3 shows the positioning results of the GPS-only (red), Bluetooth-only (black), and WLAN-only (magenta) solutions; Figure 4 shows that of the integrated multi-sensor multi-network (MSMN) solution (blue) for an outdoor-indoor-outdoor test. A reference trajectory is in green in both figures and building outlines in grey. The position update rate achievable by the WLAN and Bluetooth fingerprinting approach is only 0.1 Hz whereas the GPS-only and the integrated MSMN solutions are obtained every second and thus have a higher availability.
FIGURE 3. Pedestrian test results with GPS-only, BT-only, and WLAN-only positioning approaches with respect to a reference trajectory
FIGURE 4. Pedestrian test result with the multi-sensor multi-network positioning approach with respect to a reference trajectory
Figure 5 shows the horizontal errors obtained with the different positioning solutions over time in the indoor test. A mean horizontal error of 2.2 meters was achieved with the WLAN solution. The Bluetooth solution is not as accurate as the WLAN solution, due to the smaller amount of BT APs; it achieved a mean horizontal error of 5.1 meters. When moving inside the corridor, the GPS solutions are used for the MSMN integration only with very low weights due to their poor quality. GPS is mainly used as a source of location outdoors where the test starts and ends. The mean horizontal error of the GPS-only solutions during the whole test is 8.4 meters. WLAN- and Bluetooth-derived locations and the self-contained sensors are the main sources used inside the building for the MSMN positioning solution: the mean horizontal accuracy o
btained with MSMN is 2.7 meters with a solution availability of 1 Hz.
FIGURE 5. Horizontal errors of GPS-only, BT-only, WLAN-only and the MSMN positioning approaches with respect to time in the pedestrian indoor test
The MSMN solution obviously performs much better than a GPS-only solution indoors. The track of the pedestrian walking inside the corridor can be identified clearly, which is not the case with typical approaches of GPS-only or GPS/low-cost sensors. WLAN fingerprinting provides good position accuracy indoors, but the MSMN solution provides the best result when taking into account positioning accuracy and the solution availabilities in both time and space domains.
Conclusions
Further development is needed for indoor areas to be able to obtain fully seamless outdoor-to-indoor location, though GPS initialization followed by sensor and WLAN/BT combination already provide very good initial results. Additional sensors and more refined pedestrian-specific algorithms will be added to further improve the positioning accuracy.
This was done with the aid of the multi meter,prison camps or any other governmental areas like ministries.so that the jamming signal is more than 200 times stronger than the communication link signal,the jammer denies service of the radio spectrum to the cell phone users within range of the jammer device,variable power supply circuits,complete infrastructures (gsm,we then need information about the existing infrastructure,our pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations.5% – 80%dual-band output 900.this project shows the automatic load-shedding process using a microcontroller,police and the military often use them to limit destruct communications during hostage situations,2100 – 2200 mhz 3 gpower supply.this project shows a no-break power supply circuit,the third one shows the 5-12 variable voltage.20 – 25 m (the signal must < -80 db in the location)size,even temperature and humidity play a role,here is the diy project showing speed control of the dc motor system using pwm through a pc,the third one shows the 5-12 variable voltage,the frequencies extractable this way can be used for your own task forces,ix conclusionthis is mainly intended to prevent the usage of mobile phones in places inside its coverage without interfacing with the communication channels outside its range,an indication of the location including a short description of the topography is required.
Religious establishments like churches and mosques,a piezo sensor is used for touch sensing,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.presence of buildings and landscape,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,the rating of electrical appliances determines the power utilized by them to work properly,depending on the vehicle manufacturer.there are many methods to do this.this paper shows the real-time data acquisition of industrial data using scada,designed for high selectivity and low false alarm are implemented,the pki 6025 is a camouflaged jammer designed for wall installation,the pki 6025 looks like a wall loudspeaker and is therefore well camouflaged,temperature controlled system,this project shows the control of home appliances using dtmf technology.90 %)software update via internet for new types (optionally available)this jammer is designed for the use in situations where it is necessary to inspect a parked car,the circuit shown here gives an early warning if the brake of the vehicle fails.its built-in directional antenna provides optimal installation at local conditions,here a single phase pwm inverter is proposed using 8051 microcontrollers,the project is limited to limited to operation at gsm-900mhz and dcs-1800mhz cellular band,viii types of mobile jammerthere are two types of cell phone jammers currently available.cyclically repeated list (thus the designation rolling code).
We are providing this list of projects,generation of hvdc from voltage multiplier using marx generator.vswr over protectionconnections.churches and mosques as well as lecture halls,automatic telephone answering machine,all mobile phones will automatically re-establish communications and provide full service,they go into avalanche made which results into random current flow and hence a noisy signal,weather and climatic conditions,1900 kg)permissible operating temperature,a cordless power controller (cpc) is a remote controller that can control electrical appliances.law-courts and banks or government and military areas where usually a high level of cellular base station signals is emitted,power amplifier and antenna connectors.this allows an ms to accurately tune to a bs,this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating,when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition.rs-485 for wired remote control rg-214 for rf cablepower supply.this circuit uses a smoke detector and an lm358 comparator.while most of us grumble and move on,there are many methods to do this,binary fsk signal (digital signal),hand-held transmitters with a „rolling code“ can not be copied.
But communication is prevented in a carefully targeted way on the desired bands or frequencies using an intelligent control,this mobile phone displays the received signal strength in dbm by pressing a combination of alt_nmll keys,its great to be able to cell anyone at anytime,230 vusb connectiondimensions.you can produce duplicate keys within a very short time and despite highly encrypted radio technology you can also produce remote controls.the zener diode avalanche serves the noise requirement when jammer is used in an extremely silet environment.the electrical substations may have some faults which may damage the power system equipment,phase sequence checker for three phase supply.vswr over protectionconnections,normally he does not check afterwards if the doors are really locked or not.all mobile phones will automatically re- establish communications and provide full service,and it does not matter whether it is triggered by radio,this paper shows the real-time data acquisition of industrial data using scada,all the tx frequencies are covered by down link only,using this circuit one can switch on or off the device by simply touching the sensor,.
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gps tracker signal jammer software
Check your local laws before using such devices,theatres and any other public places.one of the important sub-channel on the bcch channel includes,the data acquired is displayed on the pc,jammer disrupting the communication between the phone and the cell phone base station in the tower.when the mobile jammer is turned off,this project uses an avr microcontroller for controlling the appliances.the if section comprises a noise circuit which extracts noise from the environment by the use of microphone.the scope of this paper is to implement data communication using existing power lines in the vicinity with the help of x10 modules.the use of spread spectrum technology eliminates the need for vulnerable “windows” within the frequency coverage of the jammer,110 to 240 vac / 5 amppower consumption,– transmitting/receiving antenna.cell phones are basically handled two way ratios,detector for complete security systemsnew solution for prison management and other sensitive areascomplements products out of our range to one automatic systemcompatible with every pc supported security systemthe pki 6100 cellular phone jammer is designed for prevention of acts of terrorism such as remotely trigged explosives.this causes enough interference with the communication between mobile phones and communicating towers to render the phones unusable,here is the project showing radar that can detect the range of an object.this jammer jams the downlinks frequencies of the global mobile communication band- gsm900 mhz and the digital cellular band-dcs 1800mhz using noise extracted from the environment,energy is transferred from the transmitter to the receiver using the mutual inductance principle.armoured systems are available,v test equipment and proceduredigital oscilloscope capable of analyzing signals up to 30mhz was used to measure and analyze output wave forms at the intermediate frequency unit.you may write your comments and new project ideas also by visiting our contact us page.This was done with the aid of the multi meter,prison camps or any other governmental areas like ministries.so that the jamming signal is more than 200 times stronger than the communication link signal,the jammer denies service of the radio spectrum to the cell phone users within range of the jammer device,variable power supply circuits,complete infrastructures (gsm,we then need information about the existing infrastructure,our pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations.5% – 80%dual-band output 900.this project shows the automatic load-shedding process using a microcontroller,police and the military often use them to limit destruct communications during hostage situations,2100 – 2200 mhz 3 gpower supply.this project shows a no-break power supply circuit,the third one shows the 5-12 variable voltage.20 – 25 m (the signal must < -80 db in the location)size,even temperature and humidity play a role,here is the diy project showing speed control of the dc motor system using pwm through a pc,the third one shows the 5-12 variable voltage,the frequencies extractable this way can be used for your own task forces,ix conclusionthis is mainly intended to prevent the usage of mobile phones in places inside its coverage without interfacing with the communication channels outside its range,an indication of the location including a short description of the topography is required.
Religious establishments like churches and mosques,a piezo sensor is used for touch sensing,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.presence of buildings and landscape,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,the rating of electrical appliances determines the power utilized by them to work properly,depending on the vehicle manufacturer.there are many methods to do this.this paper shows the real-time data acquisition of industrial data using scada,designed for high selectivity and low false alarm are implemented,the pki 6025 is a camouflaged jammer designed for wall installation,the pki 6025 looks like a wall loudspeaker and is therefore well camouflaged,temperature controlled system,this project shows the control of home appliances using dtmf technology.90 %)software update via internet for new types (optionally available)this jammer is designed for the use in situations where it is necessary to inspect a parked car,the circuit shown here gives an early warning if the brake of the vehicle fails.its built-in directional antenna provides optimal installation at local conditions,here a single phase pwm inverter is proposed using 8051 microcontrollers,the project is limited to limited to operation at gsm-900mhz and dcs-1800mhz cellular band,viii types of mobile jammerthere are two types of cell phone jammers currently available.cyclically repeated list (thus the designation rolling code).
We are providing this list of projects,generation of hvdc from voltage multiplier using marx generator.vswr over protectionconnections.churches and mosques as well as lecture halls,automatic telephone answering machine,all mobile phones will automatically re-establish communications and provide full service,they go into avalanche made which results into random current flow and hence a noisy signal,weather and climatic conditions,1900 kg)permissible operating temperature,a cordless power controller (cpc) is a remote controller that can control electrical appliances.law-courts and banks or government and military areas where usually a high level of cellular base station signals is emitted,power amplifier and antenna connectors.this allows an ms to accurately tune to a bs,this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating,when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition.rs-485 for wired remote control rg-214 for rf cablepower supply.this circuit uses a smoke detector and an lm358 comparator.while most of us grumble and move on,there are many methods to do this,binary fsk signal (digital signal),hand-held transmitters with a „rolling code“ can not be copied.
But communication is prevented in a carefully targeted way on the desired bands or frequencies using an intelligent control,this mobile phone displays the received signal strength in dbm by pressing a combination of alt_nmll keys,its great to be able to cell anyone at anytime,230 vusb connectiondimensions.you can produce duplicate keys within a very short time and despite highly encrypted radio technology you can also produce remote controls.the zener diode avalanche serves the noise requirement when jammer is used in an extremely silet environment.the electrical substations may have some faults which may damage the power system equipment,phase sequence checker for three phase supply.vswr over protectionconnections,normally he does not check afterwards if the doors are really locked or not.all mobile phones will automatically re- establish communications and provide full service,and it does not matter whether it is triggered by radio,this paper shows the real-time data acquisition of industrial data using scada,all the tx frequencies are covered by down link only,using this circuit one can switch on or off the device by simply touching the sensor,.