| 摘要 |
PROBLEM TO BE SOLVED: To speedily control transmission power by comparing a received radio wave intensity measurement value from a GPS satellite with estimated received radio wave intensity, estimating radio wave attenuation quantity on a radio transmission line from the obtained result and control transmission power to the satellite according to the quantity. SOLUTION: An estimated received radio wave intensity calculation part 11 calculates the estimated value of GPS signal reception intensity by using position/track information of respective GPS satellites, which are obtained by a GPS signal processing part 10, and GPS satellite transmission antenna directivity information obtained in a GPS satellite transmission antenna directivity information storage part 15. A GPS signal reception intensity measuring part 12 measures received radio wave intensity from respective GPS satellites by a signal obtained with a GPS signal reception antenna 5. A radio wave attenuation state monitoring part 13 compares estimated received radio wave intensity obtained by the estimated radio wave intensity calculation part 11 with the measured received radio wave intensity, obtained in the GPS signal reception intensity measuring part 12 and obtains radio wave atmosphere attenuation information. An adaptive transmission power calculation part 14 decides adaptive transmission power by these pieces of information.
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