Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1997-05-28
2000-04-18
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
342359, H04B 7185, H01Q 300
Patent
active
060520841
ABSTRACT:
A vehicle-mounted satellite signal receiving system adopting a satellite tracking system combining gyro tracking and hybrid tracking is disclosed which can correct a sensitivity coefficient for correcting a gyro sensor output signal to make up for a sensitivity error, even when a drift is produced in the sensitivity error. In this system, gyro tracking is caused when the received power level is above a threshold power level. The gyro tracking is done by determining the angular velocity .omega. of an antenna as .omega.=-(.omega.G.times..DELTA.SB+.omega.G from a value obtained by inverting the sign of the product of a gyro tracking angular velocity .omega.G and a sensitivity coefficient .DELTA.SB for dealing with the sensitivity error and a predetermined offset error correction value .omega.G and setting the antenna to .omega.. When .DELTA.SB is inaccurate and a sensitivity error is generated in the gyro sensor output signal, the received power level is reduced. When the received power level becomes lower than a threshold power level LB, the sensitivity coefficient is corrected on the basis of the sense of the angular velocity .omega.S in the hybrid tracking (step tracking) and in the gyro tracking.
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Patent Abstracts of Japan vol. 17, No. 619 (P-1644), Nov. 15, 1993 & JP 05 196475 A (Japan Radio).
Aoshima Shigeki
Harada Tomohisa
Issing Gregory C.
Toyota Jidosha & Kabushiki Kaisha
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