A GPS time system test method for remote sensing satellites

Abstract

A remote sensing satellite GPS time system testing method, which makes the time of the attitude orbit control subsystem consistent with the time reference of the ground time system equipment, and the ground test equipment of the attitude orbit control subsystem is consistent with the time reference of the ground time system equipment, and finally realizes the attitude orbit The timing of the control subsystem is consistent with that of the ground test equipment for the attitude-orbit control subsystem. The present invention can reduce the start-up delay error of the attitude orbit control ground equipment and the GPS signal emulator by processing the time statistics of the attitude orbit control ground testing equipment, and eliminate the cumulative error between the satellite and the ground produced by the attitude orbit control ground equipment, Accurate synchronization between the satellite and the ground is achieved, thereby improving the time and orbit determination accuracy of the satellite attitude and orbit control subsystem.

Description

technical field [0001] The invention relates to a remote sensing satellite GPS time system test method, which belongs to the field of satellite comprehensive test. Background technique [0002] Remote sensing satellites use on-board GPS receivers to provide precise timing and orbit determination services for AOCS (Attitude and Orbit Control Subsystem). During the ground comprehensive test, the ground GPS signal simulator is used to output GPS signals to simulate the GPS signals received when the satellite is actually in orbit, and the AOCS ground test equipment provides test excitation signals for the satellite flight to verify the design of the AOCS satellite-ground simulation on-orbit flight program reasonableness and feasibility. The satellite-rocket separation signal is the trigger signal of the satellite's AOCS flight program. In previous tests, the satellite-rocket separation signal was generated by the AOCS ground test equipment to provide the satellite with a trigge...

AI Technical Summary

Problems solved by technology

The satellite-rocket separation signal is the trigger signal of the satellite's AOCS flight program. In previous tests, the satellite-rocket separation signal was generated by the AOCS ground test equipment to provide the satellite with a trigger excitation signal. This signal is not output externally. Manually click the start switch at all times, there are human operation errors, and the computer clock of the AOCS ground test equipment is unstable. When the satellite flies continuously for 20 days, the cumulative error of the satellite-ground time can reach 15s-20s at most, resulting in a decrease in the accuracy of the orbit determination of the satellite AOCS subsystem

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