| 摘要 |
PURPOSE:To simplify the fetch processing of a position data by executing the fetch processing of a position data as to at least two satellites and acquiring the position data of other satellite from a parameter when the other satellite is commanded. CONSTITUTION:An input device 4 selects a parameter fetch mode and acquires position data Cx, Cy as to two satellites, then a unit change DELTAC of the position data to a change DELTAA of the unit quantity of a longitude is obtained and stored in a memory 11. When the input device 4 instruct a satellite different from satellites as to a satellite Z to be received, the longitude information Az of the satellite Z is read from the memory 11, the longitude information X of a 1st reference satellite and parameters DELTAA and DELTAC are read from the memory 11 and are calculated to obtain a position data Cz of the satellite Z, then the procedure is proceeded to the routine of adjusting the direction of the antenna 1. Thus, it is not required to fetch position data of all satellites at the installation of the antenna 1 and the installation of the antenna is facilitated.
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