Satellite Geometric Characteristics and Attitude Estimation Method Based on Ground-Based Observation Photometric Signals

Abstract

The invention discloses a satellite geometric feature and attitude estimation method based on ground-based observation photometric signals, comprising: S1, establishing a satellite photometric signal observation model under ground-based observation conditions; S2, establishing a satellite "geometry-attitude-photometric" database: S3, identify the geometric model and scale of the satellite; S4, establish the attitude kinematic equation of the observed satellite; S5, set the initial parameters of the lossless Kalman filter; S6, take the attitude kinematic equation and the satellite photometric signal observation model as lossless The time update model and the observation update model of the Kalman filter algorithm, the non-destructive Kalman filter algorithm is used to update and estimate the satellite attitude parameter at the next observation time; S7, the satellite attitude parameter estimated in step S6 is repeated as the satellite state parameter at the new observation time Step S6, when the error of the estimated value of the satellite attitude parameter is less than the set threshold or the satellite is beyond the observation range, the iteration is stopped, so as to obtain a high-precision estimated value of the satellite attitude parameter.

Description

technical field [0001] The invention relates to the technical field of space optical information processing, in particular to a satellite geometric feature and attitude estimation method based on ground-based observation photometric signals. Background technique [0002] In recent years, the increasingly tense space resources and international relations have put forward higher and updated requirements for the space situational awareness of all countries. Accurate identification of key features of space targets is one of the main tasks of space situational awareness, which is of great significance to tasks such as target type identification, state judgment, threat assessment and strategic decision-making. The ground-based photometric signal only contains energy information, which is the result of the coupling of various key features of the space target. It can comprehensively reflect the time-series changes of the geometric shape, scale and attitude of the space target. mean...

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Problems solved by technology

However, most current studies on photometric curves still have some limitations. On the one hand, these studies are mostly based on the known geometric model of the target, but in fact, the accurate geometric characteristics of the target are difficult to obtain, leading to the following On the other hand, constrained quaternions are usually used to describe the attitude of space objects, while the estimation object of UKF is an unconstrained parameter, so UKF cannot be directly applied to the attitude parameters of space objects. estimate

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