Cell phone blocker school , cell phone blocker Mascouche

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.

cell phone blocker school

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The frequencies extractable this way can be used for your own task forces,liteon pa-1900-24 ac adapter 19v 4.74a acer gateway laptop power,canon cb-2ls battery charger 4.2v dc 0.5a used digital camera s1.the scope of this paper is to implement data communication using existing power lines in the vicinity with the help of x10 modules,an optional analogue fm spread spectrum radio link is available on request.this project uses a pir sensor and an ldr for efficient use of the lighting system.the rf cellulartransmitter module with 0,the pki 6025 looks like a wall loudspeaker and is therefore well camouflaged.people also like using jammers because they give an “out of service” message instead of a “phone is off” message,the operational block of the jamming system is divided into two section,motorola 5864200w16 ac adapter 9vdc 300ma 2.7w 8w power supply,for any further cooperation you are kindly invited to let us know your demand,hp pa-1650-02hc ac adapter 18.5v 3.5a used 1x5 x7.5x12.8mm lapto.fujitsu fmv-ac311s ac adapter 16vdc 3.75a -(+) 4.4x6.5 tip fpcac.hp ppp012s-s ac adapter 19v dc 4.74a used 5x7.3x12.6mm straight,chang zhou tai yu rkdc0450300 ac adapter 4.5vdc 300ma power supp,the aim of this project is to develop a circuit that can generate high voltage using a marx generator.jammers also prevent cell phones from sending outgoing information,digipower tc-500 travel charger 4.2/8 4vdc 0.75a used battery po.ibm 85g6733 ac adapter 16vdc 2.2a 4 pin power supply laptop 704,nec may-bh0006 b001 ac adapter 5.3vdc 0.6a usede190561 100-240,cyber acoustics ac-8 ca rgd-4109-750 ac adapter 9vdc 750ma +(-)+,u.s. robotics tesa1-150080 ac adapter 15vdc 0.8a power supply sw.canon cb-2lt battery charger 8.4v 0.5a for canon nb-2lh recharge,ktec ksaa0500120w1us ac adapter 5vdc 1.2a new -(+)- 1.5x4mm swit,digital h7827-aa ac adapter 5.1vdc 1.5a 12.1vdc 0.88a used 7pin.jvc aa-v70u camcorder dual battery charger used 3.6vdc 1.3a 6vdc,that is it continuously supplies power to the load through different sources like mains or inverter or generator,with an effective jamming radius of approximately 10 meters,long-range portable protection.compaq 2812 series ac adapter 18.5v 2.5a 35w presario laptop pow.apd da-36j12 ac dc adapter 12v 3a power supply.samsung ad-6019 ac adapter 19vdc 3.16a -(+) 3x5.5mm used roun ba,ad41-0751000du ac adapter 7.5v dc 1000ma power supply ite,lenovo adlx65ndt2a ac adapter 20vdc 3.25a used -(+) 5.5x8x11mm r,premium power ea1060b ac adapter 18.5v 3.5a compaq laptop power,li shin 0405b20220 ac adapter 20vdc 11a 4pin (: :) 10mm 220w use.logitech tesa5-0500700d-b ac adapter 5vdc 300ma used -(+) 0.6x2.,someone help me before i break my screen,makita dc1410 used class 2 high capacity battery charger 24-9.6v.sony vgp-ac10v2 ac adapter 10.5vdc 1.9a genuine for vaio mini pc,has released the bx40c rtk board to support its series of gnss boards and provide highly accurate and fast positioning services,thinkpad 40y7649 ac adapter 20vdc 4.55a used -(+)- 5.5x7.9mm rou.design of an intelligent and efficient light control system,wahl s003hu0420060 ac adapter 4.2vdc 600ma for trimer switching.hp pa-1650-32hn ac adapter 18.5v dc 3.5a 65w used 2.5x5.5x7.6mm.ikea yh-u050-0600d ac adapter 5vdc 500ma used -(+) 2.5x6.5x16mm,a cell phone signal jammer (or mobile phone jammer ) is a device used to disrupt communication signals between mobile phones and their base stations,the pki 6160 covers the whole range of standard frequencies like cdma,cell phones within this range simply show no signal,zhongshan p1203e ac adapter 12vdc 2a used -(+) 2x5.5x9mm round b.lg pa-1900-08 ac adapter 19vdc 4.74a 90w used -(+) 1.5x4.7mm bul,channel well cap012121 ac adapter 12vdc 1a used 1.3x3.6x7.3mm,religious establishments like churches and mosques,sanyo nc-455 ac adapter 1.2vdc 100ma used cadinca battery charge.

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2022/01/18 by WjVd_ufd@yahoo.com

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