The directional antenna of cell phone jammer is widely seen in common use

After 20 years of proven, GPS system is a high-precision, all-weather and global radio navigation, positioning and timing of the multi-functional system. GPS technology has become a multi-area, multi-mode, multi-purpose, multi-model international high-tech industries.
Location-based services, also known as Mobile Location Services, which is moving through the telecom operator's network for mobile end-user location information , the electronic map platform support under the appropriate service to provide users with a value-added services. Mobile positioning is the use of cellular GSM mobile communications network technology to achieve location information query, GSM wireless communications network is composed of many different communities, like bees to build honeycomb formed, each cell has its own number, where the district through the phone identification number on the phone to know where the area. Current cell phone location technology is still being improved, largely in urban accuracy range of about 200 meters, roughly the range accuracy of the suburbs in the 1000 meters to 2000 meters, with the Mobile technology continues to evolve, I believe will further enhance the accuracy to 50 meters range. While the current show is still a landmark name being optimized, with further optimization, the landmark will be more accurate. The directional antenna of cell phone jammer is widely seen in common use.
Currently there are two ways to locate mobile phone, one is the WAP version, there is a text version. SMS version of the phone positioning is relatively simple to use, WAP version of the phone you can map showing the specific location. SMS version of the phone can be positioned across the country, the general to the more precise location in the province, the provinces can be positioned within the post can be targeted to specific regions were. SMS costs 0.10 yuan / article, information fee of 6 yuan / month, this information is generally equivalent to monthly fee charges. The directional antenna of cell phone jammer contains 2 pieces of antenna plates.
In fact, the receiver can often lock four or more satellites, then, a constellation of satellites the receiver can be distributed into several groups of four, and then selected by the algorithm a set of minimum error for positioning, which improve the accuracy. As the satellite orbits, satellite clock errors exist, troposphere, ionosphere on the signals, as well as man-made SA protection policy, making civilian GPS positioning accuracy is only 100 meters. To improve the positioning accuracy, commonly used differential GPS (DGPS) technology, a reference station (differential station) for GPS observations, using precise coordinates of known base stations, compared with observations to arrive at a correct number, and released .