Car tracker blocker | gps car tracker signal jammer guitar


Figure 1. Example of the GNSS signal propagation using ray-tracing and a 3D building map. A particle-filter-based positioning method using a 3D map to rectify the errors created by multipath and non-line-of-sight signals on the positioning result delivered by a low-cost single-frequency GPS receiver takes a multi-GNSS approach, using the combined signals of GPS, GLONASS and QZSS. The method outperforms conventional positioning in availability and positioning accuracy. It will likely be fused with other sensors in a future pedestrian navigation application. By Li-Ta Hsu, Shunsuke Miura and Shunsuke Kamijo GPS provides an accurate and reliable positioning/timing service for pedestrian application in open field environments. Unfortunately, its positioning performance in urban areas still has a lot of room for  improvement, due to signal blockages and reflections caused by tall buildings. The signal reflections can be divided into multipath and non-line-of-sight (NLOS) effects. Recently, use of 3D building models as aiding information to mitigate or exclude multipath and NLOS effects has become a promising area of study. At first, researchers used the 3D map model to simulate multipath effects to assess the single-reflection environment of a city. Subsequently, the metric of NLOS signal exclusion using an elevation-enhanced map, extracted from a 3D map, was developed and tested using real vehicular data. An extended idea of identifying NLOS signals using an infrared camera onboard a vehicle has been suggested. The potential of using a dynamic 3D map to design a multipath-exclusion filter for a vehicle-based tightly coupled GPS/INS integration system has also been studied. A forecast satellite visibility based on a 3D urban model to exclude NLOS signals in urban areas was developed. The research approaches outlined above seek to exclude the NLOS signal; however, the exclusion is very likely to cause a horizontal dilution of precision distortion scenario, due to the blockage of buildings along the two sides of streets. In other words, the lateral (cross direction) positioning error would be much larger than that of the along-track direction. Therefore, approaches applying multipath and NLOS signals as measurements become essential. One of the most common methods, the shadow-matching method, uses 3D building models to predict satellite visibility and compare it with measured satellite visibility to improve the cross street positioning accuracy. A multipath and NLOS delay estimation based on software-defined radio and a 3D surface model based on a particle filter was proposed and tested in a static experiment in the Shinjuku area of Tokyo.The research team of The University of Tokyo developed a particle-filter-based positioning method using a 3D map to rectify the positioning result of commercial GPS single-frequency receiver for pedestrian applications. An evaluation of the QZSS L1-submeter-class augmentation with integrity function (L1-SAIF) correction to the proposed pedestrian positioning method was also discussed in an earlier paper by the authors of this article. However, satellite visibility in the urban canyon using only GPS and QZSS would not be enough for this proposed method. The use of emerging multi-GNSS, encompassing GLONASS, Galileo and BeiDou, could furnish a potential solution to the lack of visible satellites for this method. This article assess the performance of the proposed pedestrian positioning method using GPS, GLONASS and QZSS. Building Models Construction Our work established a 3D building model by a 2D map that contained building location and height information of buildings from 3D point-clouds data. The Fundamental Geospatial Data (FGD) of Japan, which provided by Japan geospatial information authority, is open to the Japanese public. This FGD data is employed as 2D geographic information system (GIS) data. Thus, the layouts and positions of every building on the map could be obtained from the 2D GIS data. In this article, the 3D digital surface model (DSM) data is provided by Aero Asahi Corporation. Figure 2 shows the process of constructing the 3D building model used here. This process first extracts the coordinates of every building corner from FGD as shown in the left of Figure 2. Then, the 2D map is integrated with the height data from DSM. The right of Figure 2 illustrates an example of a 3D building model established in this way. The 3D building map contains a  very small amount of data for each building in comparison to that of the 3D graphic application. For our purposes, the file only contains the frame data of each building instead of the detail polygons data. This basic 3D building map is utilized in the simulation of ray-tracing. Figure 2. The construction of the 3D building map from a 2D map and DSM. Our version of the ray-tracing method does not consider diffractions or multiple reflections because these signals occurred under unfavorable conditions. Here, we utilize only the direct path and a single reflected path. The developed ray-tracing simulation can be used to distinguish reflected rays and to estimate the reflection delay distance. Our research work assumes that the surfaces of buildings are reflective smooth planes, that is, mirrors. Therefore, the rays in the simulation obey the laws of reflection. In the real world, the roughness and the absorption of the reflective surface might create a mismatch between the ray-tracing simulation and the real propagation. Here we ignore this effect, as the roughness of the building surface is much smaller than the propagation distance. The opening figure (Figure 1) shows an example of the GNSS signal propagation using ray-tracing and a 3D building map. Red, green and white lines denote the LOS path, reflected paths and the NLOS paths, respectively. In this environment, a conventional positioning method such as weighted least squares (WLS) usually estimates the position on the wrong side of street as shown in the red balloon. With the aid of 3D building model and ray-tracing, the map-based positioning method is able to provide a result close to the ground truth. Map-Based Pedestrian Positioning The flowchart of the 3D city building model-based particle filter is shown in Figure 3. This method first implements a particle filter to distribute position candidates (particles) around the ground-truth position. In Step 2, when a candidate position is given, the method can evaluate whether each satellite is in LOS, multipath or NLOS by applying the ray-tracing procedure with a 3D building model. According to the signal strength, namely carrier-to-noise ratio (C/N0), the satellite could be roughly classified into LOS, NLOS and multipath scenarios. If the type of signal is consistent between C/N0 and ray-tracing classification, the simulated pseudorange of the satellite for the candidate will be calculated. In the LOS case, simulated pseudoranges can be estimated as the distance of the direct path between the satellite and the assumed position. In the multipath and NLOS cases, simulated pseudoranges can be estimated as the distance of the reflected path between the satellite and the candidate position via the building surface. Figure 3. Flowchart of the particle filter using 3D city building models. Ideally, if the position of a candidate is located at the true position, the difference between the simulated and measured pseudoranges should be zero. In other words, the simulated and measured pseudoranges should be identical. Therefore, the likelihood of each valid candidate is evaluated based on the pseudorange difference between the pseudorange measurement and simulated pseudorange of the candidate, which is simulated by 3D building models and ray-tracing. Finally, the expectation of all the candidates is the rectified positioning of the proposed map method. This method can therefore find the optimum position through a dedicated optimization algorithm of these assumptions and evaluations. The positioning principle of the proposed method is very different from the conventional GPS positioning method, that is, WLS. As a result, the calculation of the positioning accuracy of the 3D map method should be also different. We define two positioning performance measures for the 3D map method: user range accuracy of the 3D map method (URA3Dmap) and positioning accuracy. The value of URA3Dmap is to indicate its level of positioning service, which is similar to the user range accuracy (URA) of conventional GPS. The URA3Dmap is defined based on the percentage of the valid candidates from all candidates outside the building. The higher percentage of the valid candidate implies a higher confidence of the estimated position. Ideally, if the center of the candidate distribution is not far from the ground truth, the simulated pseudorange of the candidates located at the center of distribution would be very similar to the measurement pseudorange. We define the URA3Dmap as shown in Table 1. Table 1. The definition of URA and URA3Dmap used in this article. Experiments and Discussion We selected the Hitotsubashi and Shinjuku areas in Tokyo to construct a 3D building model because of the density of the tall buildings. In this area, multipath and NLOS effect are frequently observed. We tested pedestrian navigation in a typical path that included walking both sides of street and passing through/waiting at a road intersection. The cut-off angle is 20 degrees. The data were collected in November and December 2014. We compare here two single point positioning methods: single-point positioning solutions provided by open source RTKLIB software (RTKLIB SPP), and the proposed 3D map method. RAIM FDE of the RTKLIB SPP is used here as a conventional NLOS detection algorithm. The test used a geodetic-grade GNSS receiver and a commercial grade receiver. The geodetic receiver was only used to collect the QZSS L1-SAIF correction signal. The antenna of the commercial receiver was attached in the strap of the backpack as shown in Figure 4. The receiver is connected to a tablet to record the GNSS measurements and is set to output pseudorange measurements and positioning results every second. Figure 4. Equipment set-up. We generated a quasi-ground truth using a topographical method.Video cameras were set in the ninth and18th floors of a building near the Hitotsubashi and Shinjuku areas, respectively, to record the traveled path. The video data output by the cameras are used in combination with one purchased high-resolution aerial photo to get the ground truth data. The aerial photo is 25 cm/pixel and therefore the error distance for each estimate can be calculated. The synchronization between video camera and commercial GNSS receiver is difficult to get as accurate as in the topographical method. As a result, we used point to “points” positioning error to evaluate the performance of the dynamic experiment. The synchronization error is limited to 1 second. Hence, for each estimated position x(t), the ground truth points used to calculate the positioning error is xGT (t-1), xGT (t) and xGT (t+1). The point to “points” positioning error is calculated as: Three performance metrics are used here: mean, standard deviation of the point to points error, and the availability of positioning solution. The availability defined here means the percentage of given solutions in a fixed period. For example, if a method outputs 80 epochs in 100 seconds, the availability of the method is 80 percent. This research demonstrates two dynamic data. The skyplot of the data are shown in Figure 5. The satellites are tracked by the commercial receiver. The grey areas indicate the obstruction of the surrounding buildings. The two dynamic data are typical signal receptions at Hitotsubashi (middle urban canyon) and Shinjuku (deep urban canyon) areas. Hitotsubashi Mid-Canyon. To study the benefit of using different GNSS constellations in the 3D map method, Figure 6 shows the trajectory estimated by the proposed method under different satellite constellations. The different colors indicate different values of URA3Dmap of each point. This walking trajectory is divided into five sections (identified as A, B, C, D and E in the right-most of the three plots). In the GPS-only case (left), results in A and B sections have much better performance than sections D and E, because more than half of the GPS satellites are blocked at D and E, as shown in the left of Figure 5. Figure 5. The left and right are the skyplot of the dynamic experiment at the Hitotsubashi and Shinjuku areas, respectively, in Tokyo. The middle plot in Figure 6 shows the trajectory using GLONASS. It is obvious that the positioning results located at the right side of street are greatly increased, derived from the greater number of satellites in view. However, the quality of the GLONASS signal is not as good as GPS because multipath has a double effect on GLONASS. Figure 6. Positioning results of the proposed 3D map method using different combinations of satellite constellations in a middle urban canyon. In summary, the positioning error of applying GLONASS maintains a similar level, and availability increases about 12 percent compared to using GPS only. The right plot of Figure 6 shows the result after adding QZSS L1 C/A and L1-SAIF. This increases the results of C, D and E sections, because QZSS provides a high-elevation-angle satellite to the 3D map method. As a result, the number of valid candidate points in C, D and E sections increases dramatically. The reliability in C, D and E sections is also much higher than that of GPS+GLONASS. In addition, the trajectory became smoother than before. Table 2 compares the positioning results of both RTKLIB SPP and the 3D map method, showing the 3D map method using GPS, GLONASS and QZSS to have the best performance among three scenarios. The positioning error mean and availability are 3.89 meters and 96.72 percent, respectively. The positioning error mean could be further improved to 3.23 meters if selecting the position point with URA3Dmap ≤ 3 (yellow, orange and red points in Figure 6). This selection will lose about 17 percent of availability. Table 2. Positioning results of the 3D map method using different combinations of satellite constellations in a middle urban canyon. Shinjuku Deep Canyon. We conducted a similar experiment in the Shinjuku area of Tokyo, the most urbanized area in Japan (Figure 7). The positioning results and skyplot are shown in Figure 8 and the right of Figure 5, respectively. Table 3 compares the results of the two methods using the three constellation configurations. Figure 7. Deep urban canyon environment, Shinjuku, Tokyo. (Courtesy Google Earth) Figure 8. Positioning results of the proposed 3D map method using different combinations of satellite constellations in a deep urban canyon. Table 3. Performance comparison of RTKLIB SPP and the proposed 3D map method using different combinations of satellite constellations in a deep urban canyon. As shown in the left of Figure 8, only half of the GPS-only solutions are on the correct side of the street. A few points are incorrect due to the insufficient number of satellites. Adding GLONASS measurements greatly increases the availability, and most of the GPS-only outliers are corrected. The positioning error mean improves from 12.7 to 10.3 meters, and the availability improves from 53.2 to 75.9 percent. GLONASS measurements provide such a significant improvement because the distribution of GPS and GLONASS satellites are complementary. After adding the QZSS measurements, availability further increases to 88.6 percent, and positioning error mean is reduced to 5.7 meters. The positioning error mean could be further improved to 4.2 meters if selecting the position points with URA3Dmap ≤ 3: the red, orange and yellow points in Figure 8. Although this selection will lose about 12 percent of availability, it could be easily compensated by a simple filtering technique. Comparing Table 2 and Table 3, we find the positioning error of the proposed method in the middle urban canyon is about 1 meter worse than that in the deep urban canyon. This is because of the increase of multiple reflected signals. The target application of this 3D map method is consumer-based pedestrian navigation. Most of these applications benefit from an integrated system of multiple sensors. The 3D map method could serve as one sensor for such an integrated system. The calculation of positioning accuracy is required to indicate the quality of the point solution estimated by this method. Figure 9 shows the relationship between the calculated accuracy and positioning error. We can find that the calculated accuracy is able to describe the performance of the proposed method. Figure 9. Positioning error of the 3D map method using GPS+GLONASS+QZSS. The purple line denotes the calculated 68 percent accuracy of the proposed method. The performance of the conventional method is very inaccurate in this deep urban canyon. Its positioning error is larger than 40 meters. Figure 10 shows the number of satellites in this data. Note the number of LOS satellites is determined by the ray-tracing simulation according to the ground truth trajectory. Figure 10. Number of LOS satellites, the number of satellites used in the 3D map method, and the total number of satellites tracked by the commercial-grade receiver. The number of LOS satellites means the light-of-sight path of satellite is not blocked by buildings. Note that the LOS signal also contains the multipath effect. In this deep urban canyon, the number of LOS signals is much less than that of all received satellites. This implies a lot of NLOS is received, which deteriorates the performance of the conventional method. The map-based method is able to correct most of the NLOS signals. The number of satellites used in the map-based method is close to the number of all the satellites received. Therefore the map-based method can achieve better performance than the conventional method. Figure 11 demonstrates the comparison between the map-based method and the commercial GNSS receiver. The map-based method is simply smoothed by a moving average filter with 3 seconds data. It is difficult to understand the pedestrian trajectory by the commercial-grade receiver result. In some cases, the commercial receiver will estimate the pedestrian to be on the wrong side of the streets. The proposed method, instead, is capable of estimating the result at the correct side of the street. Figure 11. Positioning results of the proposed 3D map method and commercial-grade receiver using GPS+GLONASS+QZSS in the deep urban canyon. Li-Ta Hsu is a post-doctoral researcher at the Institute of Industrial Science of the University of Tokyo. He received his Ph.D. degree in aeronautics and astronautics from National Cheng Kung University, Taiwan. Shunsuke Miura received an M.S. degree in information science from the University of Tokyo in 2013. Shunsuke Kamijo received a Ph.D. in information engineering from the University of Tokyo, where he is now an associate professor.

car tracker blocker

Extra shipping charges for international buyers (postal service),condor wp05120i ac adapter 12v dc 500ma power supply,nexxtech tca-01 ac adapter 5.3-5.7v dc 350-450ma used special ph.hp pa-1900-32hn ac adapter 19vdc 4.74a -(+) 5.1x7.5mm used 100-2.bti ac adapter used 3 x 6.3 x 10.6 mm straight round barrel batt.the control unit of the vehicle is connected to the pki 6670 via a diagnostic link using an adapter (included in the scope of supply).specialix 00-100000 ac adapter 12v 0.3a rio rita power supply un,circuit-test ad-1280 ac adapter 12v dc 800ma new 9pin db9 female,ridgid r86049 12vdc battery charger for drill impact driver cord.energizer jsd-2710-050200 ac adapter 5vdc 2a used 1.7x4x8.7mm m7783 ac adapter 24vdc 1.04a macintosh powerbook duo power,this project uses an avr microcontroller for controlling the appliances,my mobile phone was able to capture majority of the signals as it is displaying full bars.anta mw57-1801650a ac adapter 18v 1.65a power supply class 2,usb 2.0 cm102 car charger adapter 5v 700ma new for ipod iphone global wrg20f-05ba ac adapter 5vdc 4a -(+)- 2.5x5.5mm used,this device is a jammer that looks like a painting there is a hidden jammer inside the painting that will block mobile phone signals within a short distance (working radius is 60 meters),15 to 30 metersjamming control (detection first),motorola spn4569e ac adapter 4.4-6.5vdc 2.2-1.7a used 91-57539,digipower acd-kdx ac adapter 3.4vdc 2.5a 15pins travel charger k,canon ca-560 ac dc adapter 9.5v 2.7a power supply.

Yhi yc-1015xxx ac adapter 15vdc 1a - ---c--- + used 2.2 x 5.5 x.cell phone jammer is an electronic device that blocks transmission of …,hb hb12b-050200spa ac adapter 5vdc 2000ma used 2.3 x 5.3 x 11.2,adapter ads-0615pc ac adapter 6.5vdc 1.5a hr430 025280a xact sir, ,acbel api4ad19 ac adapter 15vdc 5a laptop power supply,jvc vu-v71u pc junction box 7.5vdc used power supply asip6h033.410906003ct ac adapter 9vdc 600ma db9 & rj11 dual connector,delta adp-51bb ac adapter 24vdc 2.3a 6pin 9mm mini din at&t 006-,delta adp-180hb b ac adapter 19v dc 9.5a 180w switching power su,sony ac-940 ac adapter 9vdc 600ma used +(-) 2x5.5x9mm round barr,at&t tp-m ac adapter 9vac 780ma used ~(~) 2x5.5x11mm round barre,wifi gps l1 all in one jammer high-capacity (usa version) us$282,tc-06 ac adapter dc 5v-12v travel charger for iphone ipod cond.dee ven ent dsa-0301-05 5v 3a 3pin power supply,black and decker etpca-180021u2 ac adapter 26vdc 210ma class 2,ambico ue-4112600d ac dc adapter 12v 7.2va power supply.linksys wa15-050 ac adapter 5vdc 2.5a used -(+) 2.5x5.5mm round,mobile jammers successfully disable mobile phones within the defined regulated zones without causing any interference to other communication means.we hope this list of electrical mini project ideas is more helpful for many engineering students,check your local laws before using such devices.

Nec pa-1700-02 ac adapter 19vdc 3.42a 65w switching power supply.lenovo pa-1900-171 ac adapter 20vdc 4.5a -(+) 5.5x7.9mm tip 100-,load shedding is the process in which electric utilities reduce the load when the demand for electricity exceeds the limit,liteon pa-1900-34 ac adapter 19v dc 4.74a used 1.7x5.5x11.2mm.jvc aa-v16 camcorder battery charger.condor a9-1a ac adapter 9vac 1a 2.5x5.5mm ~(~) 1000ma 18w power,so that we can work out the best possible solution for your special requirements,delta eadp-18cb a ac adapter 48vdc 0.375a used -(+) 2.5x5.5mm ci.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.usb a charger ac adapter 5v 1a wallmount us plug home power supp.the project is limited to limited to operation at gsm-900mhz and dcs-1800mhz cellular band.dual group au-13509 ac adapter 9v 1.5a used 2x5.5x12mm switching,insignia u090070d30 ac adapter 9vdc 700ma used +(-)+ 2x5.5mm rou.technics tesa2-1202100d ac adapter 12vdc 2.1a -(+)- switching po,kodak k4500-c+i ni-mh rapid batteries charger 2.4vdc 1.2a replacement ac adapter 19.5v dc 4.62a power supply,f10723-a ac adapter 24vdc 3a used -(+) 2x5.5mm rounnd barrel,so that the jamming signal is more than 200 times stronger than the communication link signal,umec up0351e-12p ac adapter +12vdc 3a 36w used -(+) 2.5x5.5mm ca-590 compact power adapter 8.4vdc 0.6a used mini usb pow.frequency band with 40 watts max.

Now type use wifi/wifi_ jammer (as shown in below image).citizen dpx411409 ac adapter 4.5vdc 600ma 9.5w power supply,.

are mobile phone signal jammers legal in the uk | electronic mobile phone signal jammer | handheld mobile phone jammer | jammer lte mobile phones | jammer mobile phone | jammer mobile phone jack | jammer mobile phone lookup | jammer mobile phone manual | mobile cell phone signal jammer | mobile phone jammer Manitoba | mobile phone jammer South Africa | mobile phone and gps jammer for hidden gps | mobile phone and gps jammer reviews | mobile phone jammer app | mobile phone jammer Armstrong | mobile phone jammer Barkmere | mobile phone jammer Beauharnois | mobile phone jammer Burlington | mobile phone jammer buy | mobile phone jammer Camrose | mobile phone jammer Cardiff | mobile phone jammer cheap | mobile phone jammer Contrecoeur | mobile phone jammer Courtenay | mobile phone jammer detector | mobile phone jammer Dorval | mobile phone jammer Inverness | mobile phone jammer karachi | mobile phone jammer Lethbridge | mobile phone jammer Longueuil | mobile phone jammer Lorraine | mobile phone jammer making | mobile phone jammer manufacturer | mobile phone jammer Marieville | mobile phone jammer Montreal | mobile phone jammer Nelson | mobile phone jammer Preston | mobile phone jammer Quesnel | mobile phone jammer Sunderland | mobile phone jammer train | mobile phone jammer Truro | mobile phone jammer Vaughan | mobile phone reception jammer | phone mobile jammer kennywood | portable mobile phone jammer | seminar report on mobile phone jammer | short range mobile phone jammer | simple mobile phone jammer | tg-110b portable mobile phone signal jammer | where to buy mobile phone jammer |