Semi-physical test system and method based on high-orbit navigation compatible machine

Abstract

The invention discloses a semi-physical test system and method based on a high-orbit navigation compatible machine, and belongs to the technical field of space. The invention provides a real GNSS antenna and GNSS simulator combined semi-physical test method, and solves the problem that a high-orbit navigation compatible machine cannot realistically simulate a high-orbit weak signal in a semi-physical test. Meanwhile, synchronous triggering of the dynamics upper computer and the GNSS simulator is achieved in a reflective memory network handshake mode, and the problem that measurement data of the high-orbit navigation compatible machine cannot be connected into a control closed loop in real time during system-level semi-physical testing is solved.

Description

technical field [0001] The invention relates to a semi-physical test system and method based on a high-orbit navigation compatible machine, in particular a system-level test method for a high-orbit navigation compatible machine under the semi-physical simulation condition of a satellite platform. Background technique [0002] On the conventional satellite platform, the navigation compatible machine mainly provides the time correction function and the auxiliary ground orbit determination function, and only needs to output accurate time information and the original measurement data of the navigation star. The test method usually uses an outdoor actual receiving antenna to introduce GPS, GLONASS and BD signals into the navigation compatible machine through the frequency transponder, and uses the time correction function of the navigation compatible machine and the satellite-to-ground digital transmission link to download the time information and original measurement data to the ...

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Problems solved by technology

[0003] The GNSS simulator can simulate the radio frequency signal of the navigation constellation. The conventional low-orbit satellite platform adopts the offline trajectory driving method of the GNSS simulator for semi-physical testing of the system. The GNSS antenna is regarded as an omnidirectional antenna, that is, all the navigation star signals generated by the simulator are Introducing a navigation compatible computer for calculation, the GNSS antenna cut-off angle for high-orbit satellites is very small, and the navigation star signals generated by most simulators are rejected at the high-orbit GNSS antenna, so if it is regarded as an omnidirectional antenna, the test results will be negative Severe distortion; in addition, the offline drive will cause a navigation error of several kilometers per second due to time asynchrony, and it is impossible to achieve accurate orbit measurement and control

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