The development of GPS on the phone A-GPS status

However, GPS positioning applications are still in action to face three major problems. First of all, GPS must be in direct line of sight (line of sight) the case can receive satellite signals, therefore, enters the room or in tall buildings in the metropolitan area, will seriously interfere with the accuracy of GPS, or even not receive positioning signals; Secondly, the existing mobile phone chips or plug must be built-in GPS module to locate, but the built-in GPS chip, power consumption and cost increase after the problem will hinder the application of GPS in mobile phones; Last, but not affect the GPS on the phone Application of the biggest obstacles is the wireless communication system and mobile phone companies for cooperation. Existing wireless communication systems, in addition to CDMA system can accommodate the operation of AGPS, the use of the most populous of the GSM system and not with the GPS positioning signal processing technology, and thus affect the mobile phone companies to develop systems with GPS function GSM mobile phone.