Short-arc orbit determination instantaneous element precision evaluation method for low-orbit spacecraft

Abstract

The invention provides a short-arc orbit determination instantaneous element precision evaluation method for a low-orbit spacecraft, and the method employs a prediction comparison method in an external coincidence precision evaluation method, achieves the prediction of the parameters of a rear measurement moment through the orbit determination result of front measurement data, and judges the orbitdetermination precision according to the external coincidence degree of the prediction parameters and the rear measurement data. According to the method, a measurement means with higher precision isnot needed, the calculation is rapid, the effect is obvious, and the precision orbit determination precision and the orbit prediction precision are improved.

Description

technical field [0001] The invention belongs to the field of aerospace measurement and control, and relates to an orbit prediction method. Background technique [0002] Accurate orbit prediction is very important for the management of spacecraft in orbit. For example, some high-precision earth observation satellites require stricter trajectory keeping control, which puts forward higher requirements for orbit forecasting. The first function of high-precision orbit forecast is to prompt the control time, and the accurate orbit forecast can predict the control time earlier; the second function is to accurately determine the control amount, so as to prolong the normal orbit working time as much as possible and reduce the control frequency. [0003] There are three factors that restrict the accuracy of spacecraft orbit prediction: one is the authenticity of the perturbation force model; the other is the accuracy of the initial root number; the third is the accuracy that can be a...

AI Technical Summary

Problems solved by technology

Among them, the observation value residual statistics is to statistically estimate the difference between the observation value of the short arc segment and the extrapolated value of the orbit determination result. The comprehensive effect of the combined effect, the error of one of the factors cannot be calculated separately; the overlapping arc comparison method reflects the difference in the orbit determination results of the two short-arc observation data, which can reflect the accuracy of the orbit determination to a certain extent, but cannot reveal the orbit determination process. systematic error

Images