Method and apparatus for non-coherent navigation using low frame rate telemetry
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United States of America Patent
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Nov 18, 2003
Grant Date -
May 15, 2003
app pub date -
Sep 12, 2002
filing date -
Feb 9, 2001
priority date (Note) -
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Abstract
A method and apparatus for obtaining measurements, on a spacecraft that employs a transceiver, at intervals that are shorter than the telemetry frame duration for use in correcting ground-based Doppler measurements so as to remove the effects of drift in the spacecraft oscillator frequency reference. Samples of navigation counters on the spacecraft that supply information that may be used to compare the uplink frequency with the downlink frequency at the spacecraft are triggered at intervals that are shorter than the duration of a telemetry frame; the samples are then included in a telemetry frame and are time tagged after they are received on the ground; the time tagged samples are then used to calculate precise two-way Doppler measurements.
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