Patent ID: 6919841
Filing Date: 2005-07-19
Classification: G01S

Abstract:
1. A GPS receiver system comprising: a standalone GPS receiver system that includes a standalone GPS receiver unit for a vehicle navigation system and independently performs a positioning operation; and an assisted GPS receiver system that includes an assisted GPS receiver unit for mobile communications and performs a positioning operation in cooperation with a location server, wherein the standalone GPS receiver unit starts and stops receiving power according to on and off operations of an ignition key switch of a vehicle, the assisted GPS receiver unit contains a transmitter section and a receiver section for the mobile communication, the standalone GPS receiver unit and the assisted GPS receiver unit share any one of a standalone GPS antenna for the standalone GPS receiver system and an assisted GPS antenna for the assisted GPS receiver system; and the transmitter section and the receiver section of the assisted GPS receiver unit receive power regardless of the on and off operation of the ignition key switch for transmitting position information acquired by the assisted GPS receiver unit to an external device and for supplying power to the GPS antenna.