Short arc batch processing-based satellite autonomous orbit determination method and device

Abstract

The invention discloses a short arc batch processing-based satellite autonomous orbit determination method and device. The method includes the following steps that: S11, GNSS observation data of a current observation arc are acquired, and gross error-free inter-satellite single-difference observation data of the whole observation arc are obtained; S12, the satellite state information of the observation arc at all observation time points is subjected to integral prediction; S13, the satellite state information is iteratively estimated through a batch processing method; S14, a posterior residual sum is calculated based on the iteratively-estimated satellite state information, and the convergence and divergence of the iterative estimation are judged according to the posterior residual sum, if a judgment result indicates that the iterative estimation is convergent, a step S15 is executed; S15, the satellite state information of a next observation arc is subjected to integral prediction; S16, a receiver clock error is calculated according to the GNSS observation data, and a receiver clock error of the next observation arc is predicted in a unified manner; and the receiver clock error of the next observation arc is led into a navigation signal tracking loop, and the method enters the next observation arc. The method provided by the invention can satisfy orbit precision requirements of medium, low and high-orbit satellites.

Description

technical field [0001] The invention relates to the technical field of satellite measurement and control, in particular to a short-arc batch-processing satellite autonomous orbit determination method and device based on satellite-borne Global Navigation Satellite System (Global Navigation Satellite System, GNSS) observation data. Background technique [0002] Satellite autonomous orbit determination technology, referred to as satellite autonomous orbit determination, refers to the technology in which a satellite determines its own position and velocity in real time based entirely on its own instruments and equipment, rather than relying on ground support. There are currently three systems that can achieve autonomous orbit determination: one is the inertial navigation system. The system has the advantages of strong concealment and good autonomy. The disadvantage is that with the long-term operation of the satellite, the system error continues to accumulate, resulting in worse...

AI Technical Summary

Problems solved by technology

The first two methods cannot complete autonomous orbit determination when the number of visible navigation satellites is less than four, and the third method is not ideal for orbit determination when the number of visible navigation satellites is less than four for a long time

[0004] Since the GNSS satellites are all distributed on medium-altitude satellite orbits, and the navigation signal transmitting antennas transmit towards the ground, the medium-high orbit satellites can only receive navigation signals from the opposite side of the earth. First of all, due to the low signal strength and poor observation quality in this situation , the number of visible navigation satellites has been less than four for a long time, so these poor observation conditions limit the application of GNSS technology in the field of measurement and control of medium and high orbit satellites

In the case of maneuvering, the number of navigation satellites that can be observed by the GNSS receiver is often less than four, and the positioning cannot be guaranteed

When adjusting the antenna pointing, the GNSS antenna may be physically blocked, which will affect the number of navigation satellites captured by the GNSS receiver.

[0005] To sum up, the existing satellite autonomous orbit determination methods have a limited scope of application, are not suitable for satellites with poor observation conditions, and cannot meet the autonomous orbit determination requirements of medium and high orbit satellites and fast mobile satellites.

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