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  • satellite clock bias estimation for igps

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1072
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the high integrity gps program seeks to provide enhanced navigation performance by combining conventional gps with a communications and ranging broadcast from the iridium® communications system. through clock and message aiding, it would enable existing gps receivers to acquire and track in more challenging environments. as is the case for standard gps, accurate and precise timing is key to performance. an approach is presented for estimating the bias of each iridium satellite clock using satellite-to-ground and satellite-to-satellite measurements. the satellite clock bias estimates are based on a kalman filter that incorporates code-type observations from the measurements at 10 s intervals. filter parameters are set based on the expected behavior of the clocks, allowing for discontinuous bias and frequency adjustments due to ground commands. typical results show the current filter to be accurate to within 200 ns while always meeting the initial system specification of half a microsecond.

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