Patent ID: 7348922

Claim:
An antenna system for a GPS (Global Positioning System) receiver having a casing and a micro processor, the antenna system comprising: at least two antenna units for receiving a satellite signal, each of said antenna units owning a different signal-receiving direction for guiding the satellite signal toward the GPS receiver; a micro controller for determining an optimal signal-receiving direction for receiving the satellite signal according to a use mode of the GPS receiver and generating a control signal for choosing a specific antenna from said at least two antenna units according to the optimal signal-receiving direction; a switching unit coupling to said antenna units and defining a receiving route for enabling the specific antenna to receive the satellite signal according to the control signal; a signal processor coupling to said switching unit for processing the satellite signal after the specific antenna receives the satellite signal and transmitting the satellite signal to the micro processor after processing; and a direction sensor for detecting the disposed orientation of the casing and generating an orientation signal for said micro controller to determine the optimal signal-receiving direction.