Satellite-ground combined carrier smoothing pseudo range ranging method

Abstract

The invention provides a satellite-ground combined carrier smoothing pseudo range ranging method, which can remarkably improve satellite ranging accuracy. The invention is realized by the following technical scheme: in a non-coherent mode, after receiving uplink signals of a ground station, the satellite performs despreading, demodulation and frame synchronization, and samples the uplink signals by using the downlink ranging information frames formed by the satellite, and transmits extracted ground station frame count, bit count, spread spectrum pseudo-code count, code phase and uplink Dopplervalue parameters to the ground station after packaging into downlink measuring frames directly; after receiving downlink ranging signals, the ground station performs dispreading, demodulation and frame synchronization so as to extract downlink measurement frame synchronization signals, implements a carrier phase smoothing pseudo range function through carrier phase and code phase measured on theground station, and utilizing uplink code phase and Doppler values sent by the satellite to complete on-satellite carrier phase smoothing pseudo range of satellite receiving signals on the ground; finally, the ground station uses the smoothed code phase to perform synthetical calculation so as to implement ranging.

Description

Technical field [0001] The invention relates to the field of high-precision ranging systems for high-orbit satellite ground stations, in particular to a high-precision orbit determination method based on carrier phase smoothing pseudoranges for high-orbit satellites in non-coherent spread spectrum mode, and specifically relates to a method based on incoherent Measured satellite-ground joint carrier smoothing pseudo-range ranging method. Background technique [0002] The aerospace measurement and control system generally includes several basic functions such as telemetry, remote control, ranging, speed measurement, and time difference measurement. Among them, ranging is to measure the distance between the satellite and the ground station by measuring the round-trip time delay of the signal. In the microwave unified measurement and control system, the ranging method is multi-side tone ranging. The ground station sends out the uplink side tone, and the answering machine directly for...

AI Technical Summary

Problems solved by technology

However, for the high-precision ranging of high-orbit satellites, especially the random error of ranging at the centimeter level, the code phase measurement error obtained by the satellite through the uplink frame will restrict the performance of the entire ranging system

The ground station uses the measurement information such as frame count, bit count, spread spectrum pseudo code count, and code phase obtained in the downlink measurement frame and the measurement information such as frame count, bit count, spread spectrum pseudo code count, and code phase obtained by ground station sampling to perform When calculating the round-trip time between the ground station and the satellite, the code phase extracted from the satellite has a large measurement noise, which cannot meet the high-precision ranging requirements

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