A-GPS (Assisted GPS) is assisted GPS technology, which can improve the performance of GPS satellite positioning system. It can be quickly located through mobile communication base stations and is widely used on mobile phones with GPS capabilities. GPS locates by radio signals from satellites. When under poor signal conditions, such as in a city, these signals may be weakened by many irregular buildings, walls, or trees. Under such conditions, non-A-GPS navigation devices may not be able to quickly locate, and A-GPS systems can quickly locate the carrier's base station information.