What is A-GPS technology and mobile applications

A-GPS

 A-GPS technology is a combination of network information and GPS base station to the mobile station to locate the information technology, can be GSM / GPRS, WCDMA and CDMA2000 networks. The technique requires an increase in the phone GPS receiver module, and the transformation of mobile phone antennas, while addition of the mobile network location server, the differential GPS base stations and other equipment. If you want to improve the program in interior areas such as GPS positioning signal shielding effectiveness, the program also addressed the need to add programs like EOTD bit measurement unit (LMU). AGPS specific works as follows:

AGPS mobile phone base station will first address itself to the location server through the network transmission;

Location server based on the approximate location of the mobile phone transmission and the location of GPS-related auxiliary information (including the GPS ephemeris and orientation of the pitch angle, etc.) to the phone;

The phone's AGPS module according to auxiliary information (to enhance the GPS signal capability of the first lock time TTFF) GPS receiver the original signal;

GPS mobile phone in the receives the original signal demodulated signal, computing the pseudo-range mobile phones to satellite (GPS pseudo-range as affected by various errors on the distance), and the information transmitted over the network to the location server;

Location server based on information coming from GPS pseudo-range positioning, and from other devices (such as differential GPS base station, etc.) of the auxiliary information to complete the GPS information processing, and to estimate the location of the phone;

Location server the location of the mobile phone to locate the gateway through the network transport or application platforms.

The advantage of AGPS solutions mainly in the positioning accuracy. Open area in the outdoors, the accuracy of GPS work in a normal environment, up to 10 meters, the highest posi