PURPOSE: To always receive the prescribed number or more of satellites neces sary for the measurement of a position by adding the receiving signals of a plurality of antennas and receiving the satellites using the added signal.
CONSTITUTION: The antenna 1A arranged inside a front window receives the radio waves of the GPS satellites within the range capable of being seen through from the front window to send the same to a signal adder 2 while the antenna 1B arranged inside a rear window receives the radio waves of the GPS satellites within the range capable of being seen through from the rear window to send the same to the signal adder 2. The adder 2 adds respective receiving signals and an RF receiving part 3 subjects the added signal to inverse diffusion to receive objective satellites necessary for the measurement of a position to send the same to a signal processing part 4. The signal processing part 4 calculates the position of the present place using the navigation data of the received satellites and sends the position measuring data to a navigation apparatus and displays necessary data such as the present place on the map of a CRT display.
TSUCHIYA TOSHIAKI
YOSHIHARA TORU
TSUJIMURA SHIGERU
