| 摘要 |
PURPOSE:To improve the position determining accuracy, by providing interference distance altering means adapted to measure distance by varying the antenna height of a master station or a slave station or both to change the interference generating distance between a direct wave and a reflected wave at the master station and the slave station. CONSTITUTION:An antenna control section 6 provides a target value to an antenna drive servo system made up of an antenna 1 and an antenna drive section 2. A transmitting/receiving section 3 supplies a transmission signal to the antenna 1 through an input/output line 201 and a drive section 2 with a transmitting/receiving circuit 31 while it receives a response signal emitted form several slave stations corresponding to the transmission signal. After a reception processing, distances to the slave stations are calculated 32 from a radio wave propagation speed and the distance data is outputted to an antenna height correction value computing section 4. Then, on the distance data, the computing section 4 judges on the access or separation between antennas and + or -DELTAh correction value of antenna height of the main station is calculated by plus or minus corresponding to the access or separation and the height of the antenna 1 is adjusted through a control section 5.
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