Fixed station for differential GPS, GPS positioning device for mobiles, navigation device, and radio receiver for GPS positioning device

摘要

In a differential GPS reference station (11) the accurate position of which is preknown, the position or pseudo range of the reference station is measured by a GPS stand-alone positioning unit on the basis of signals received from GPS satellites 131 through 134 and an error between the measured position or pseudo range of the reference station and its actual position or pseudo range is computed by a computer (14). A correction value for the error and the PRN number of each used satellite are broadcast, as reference station information, from RDS broadcasting equipment (12) while being multiplexed in an FM broadcast as an RDS signal. In a car (21), a car radio (22) receives the FM broadcast and extracts therefrom the reference station information and provides it to a computing part (23C). A GPS stand-alone positioning unit (23G) receives the signal from the GPS satellites of the same PRN number and performs GPS positioning, and the computing part (23C) corrects the measured value with the above-mentioned error and, if necessary, provides the corrected value to a navigation system (24). IMAGE