Satellite-earth time delay measurement system and work method thereof

Abstract

The invention provides a satellite-earth time delay measurement system and a work method thereof. The system comprises a GPS receiver, a spaceborne computer, a responder, a down converter, GPS timing equipment, measurement and control base-band equipment and measurement and control center management equipment. The satellite-earth time delay measurement system has the following advantages: 1, time is calibrated by use of the GPS receiver and the GPS timing equipment through adoption of the same GPS signals, time of satellite and ground test systems is unified, first bit rising edge time of a satellite remote measurement frame is directly read by use of software, local time of a first bit rising edge is demodulated through a ground device, a satellite-earth time delay is obtained through calculation, and rapid measurement, querying and counting of the satellite-earth time delay can be conveniently realized by direct use of the software; 2, the rapid measurement of the satellite-earth time delay is realized without reliance on such auxiliary devices as an oscilloscope and the like; and 3, the system has certain versatility in tests of satellite-earth time delays of satellites of various models.

Description

technical field [0001] The invention relates to the field of satellite technology in aerospace technology, in particular to a satellite-ground delay measurement system and a working method thereof. Background technique [0002] Satellite on-board computers generally use high-precision clocks, but they still cannot keep in sync with ground clocks, so satellites need to be corrected. Before performing satellite time calibration, it is necessary to accurately know the satellite-ground time difference, and when calculating the satellite-ground time difference, the satellite-ground time delay is a very important factor. It is generally considered that the satellite-ground delay is a general term for the sum of the on-board processing delay caused by the channel coding and modulation of the transponder and the delay caused by the demodulation and channel decoding processes of the baseband equipment in the ground receiving equipment. Satellite-ground time delay is an important par...

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Problems solved by technology

[0003] According to the description of the prior art, the measurement of the satellite-ground delay is generally by measuring the time difference between the first leading edge pulse of the telemetry frame sent by the satellite and the first leading edge pulse of the telemetry frame demodulated by the ground measurement and control baseband equipment through an oscilloscope , because each measurement needs to be carried out with the help of an oscilloscope, it is inconvenient in actual use, and it is inconvenient to carry out statistical analysis of satellite-ground delay

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