An Improved Initial Value Correction Method for Space Target Orbit

Abstract

The invention relates to an initial value correcting method for space target track improvement, which relates to the space technical field. In the invention, a nonlinear spreading model of prediction error coefficient related to along-track / normal direction prediction errors is established based on the prediction error spreading regulation of a space target track; nonlinear equation sets related to the prediction error coefficient of the along-track and normal direction prediction errors are respectively established based on multiple sets of observation datum acquired in different times; the evaluation to the along-track and normal direction prediction error coefficient is completed by fitting the along-track and normal direction errors; and based on the relationship between the prediction error coefficient and the track initial value error, the track initial value correcting amount is acquired, thus realizing the correction to the track initial value. Through repeated iteration, the accuracy of the track improvement initial value is improved; the track improvement process is promoted to be reliable; and the convergence is rapid.

Description

technical field [0001] The invention belongs to the field of aerospace technology, relates to orbital dynamics technology, in particular to space object orbit determination technology. Background technique [0002] With the rapid development of space target measurement technology and the urgent need for space collision early warning, the number of space target detections (including the number of targets and the amount of measurement data) has increased significantly. The success rate of orbit determination, catalog accuracy and timeliness of space target catalog management etc. The demands are constantly increasing. [0003] The purpose of improving the orbit of the space target is to use a series of observations, adopt the weighted observation residual mean square and the minimum criterion, and obtain the initial value of the orbit improvement best estimate of The entire track improvement process is actually carried out iteratively. First, the non-linear function in the...

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to overcome the deficiencies in the background technology, provide a method for correcting the initial value of the orbit of a space object, and solve the difficult problem that the orbit improvement does not converge (or the convergence efficiency is low) due to the excessive error of the initial value

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