Positioning principle of Tian Jiangjun's mobile phone

Tianjiangjun mobile phone positioning consists of GSM communication module, GPS module and base station positioning module. The GPS module completes the search and tracking of GPS satellites and the data acquisition of positioning speed.

As a supplement to the GPS positioning module, the base station positioning module completes the positioning in some special occasions when GPS cannot be positioned, so that there is no blind spot in the positioning.

The GSM communication module not only completes the short message function on our mobile phone, but also processes the collected position data and uploads it to the designated website, so as to check the position, speed and other information on the website and play back the movement track. Base station positioning is to obtain the location information (latitude and longitude coordinates) of mobile terminal users through the network of telecom mobile operators (such as GSM network). Its general principle is: the mobile phone measures the downlink pilot signals of different base stations to get the TOA (time of arrival) of the downlink pilot signals of different base stations. According to the measurement results and the coordinates of the base stations, the position of the mobile phone can be calculated by using the triangle formula estimation algorithm. So the algorithm is much more complicated. Generally speaking, the more base stations a mobile station measures, the higher the measurement accuracy and the more obvious the improvement of positioning performance. The characteristics of base station positioning are fast positioning speed and wide area. As long as there is a communication signal, it can be located without interference from natural weather. The disadvantage is that the positioning error is relatively large, which is not as accurate as GPS positioning.

Tian Jiangjun's mobile phone adopts the dual positioning technology of GPS positioning and base station positioning, and switches intelligently and seamlessly. When the GPS signal cannot be quickly located, General Tian's mobile phone system will automatically switch to the operator's base station information for quick location. Make mobile phone positioning comprehensive, accurate and without loopholes.