Spatial non-cooperative target space-based search method based on nonlinear deviation evolution

Abstract

The invention belongs to the field of spacecraft orbit dynamics and control. The invention discloses a spatial non-cooperative target space-based search method based on nonlinear deviation evolution,which comprises the following steps: 1) according to ground initial orbit determination data, obtaining the number of orbits of a space-based observation platform, and an initial relative state mean value and a covariance matrix of a spatial non-cooperative target relative to the space-based observation platform; 2) calculating a state transition tensor of relative state prediction and transitionto an angle measurement space by considering a second-order nonlinear term, and splicing the two sections of transition tensors by adopting a tensor product; 3) nonlinearly converting the initial relative state mean value and the covariance matrix into a mean value and a covariance matrix of the angle measurement quantity; 4) adopting a spiral moment camera to point to search strategy, searching atarget until the target is captured or the task is ended. According to the method, a nonlinear method is adopted to analyze and calculate the mean value and the covariance matrix of the angle measurement quantity, the dynamic change of the target position in the searching process is considered, the calculation precision and efficiency are high, and the applicability to actual tasks is good.

Description

technical field [0001] The invention relates to a space target space-based camera pointing search strategy, in particular to a space non-cooperative target space-based search method based on nonlinear deviation evolution, and belongs to the field of spacecraft orbital dynamics and control. Background technique [0002] The relative navigation of the spacecraft is the basis of space close operation missions. In recent years, with the development of aerospace technology, the demand for relative navigation has shifted from the traditional cooperative goal to the non-cooperative goal. For space cooperation targets, due to its cooperation, the accuracy of ground tracking and orbit determination is high, and it is easy for one's own spacecraft to determine the initial pointing of the spaceborne camera. For non-cooperative targets in space, due to the limited accuracy of ground tracking and orbit determination, there is great uncertainty in the position of space targets obtained, ...

AI Technical Summary

Problems solved by technology

The existing detection methods are basically ground-assisted operations, or by improving the performance of the sensor to ensure the detection effect, and do not consider the propagation of the deviation or only consider the first-order linear term, there are long detection time, low efficiency, low success rate, etc. insufficient

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