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Method for improving attitude measurement precision of multi-probe star sensor

A technology of star sensor and measurement accuracy, applied in the field of satellite attitude control, can solve problems such as violations

Active Publication Date: 2020-02-14
BEIJING INST OF CONTROL ENG
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  • Claims
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Problems solved by technology

Because the attitude filter is necessarily initialized by attitude measurements, and the installation error of the system varies with temperature variables and other factors, this necessitates the use of process noise, however this violates the two main assumptions of Friedland's bias estimation method

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  • Method for improving attitude measurement precision of multi-probe star sensor

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Embodiment 1

[0103] A method for improving the attitude measurement accuracy of a multi-probe star sensor, the multi-probe star sensor includes 3 probes, respectively probe 1, probe 2 and probe 3, the steps of the method comprising:

[0104] (1) Through the method of ground simulation, the temperature fluctuation range of probe 1 is ±0.5°C, the temperature fluctuation range of probe 2 is ±1°C, and the temperature fluctuation range of probe 3 is ±1.2°C. Therefore, probe 1 is used as the reference probe;

[0105] (2) Use the Kalman filter algorithm to estimate the change in the installation array of probe 1 and probe 2 in real time. The specific steps are:

[0106] In the first step, the initial value of the filter at the given time is k0, and the initial value of the filter includes the initial value of the relative change State covariance matrix P 0 It is a 3rd-order diagonal matrix, and its diagonal elements are all 100. The system error covariance matrix Q is a 3rd-order diagonal matr...

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Abstract

The invention relates to a method for improving attitude measurement precision of a multi-probe star sensor, and belongs to the technical field of satellite attitude control. The method comprises thefollowing steps of deducing a relationship between the position of a star point in the field of view and the installation array variation between probes, and establishing a measurement model and a state model based on the star point position as the observed quantity; and analyzing star point error characteristics in the field of view of the product by a ground test result, and correcting filter estimation parameters based on star point noise characteristics, and the product installation array estimation accuracy is improved. The method can further improve the product attitude measurement precision, and according to a ground simulation and test result, the method can improve the product attitude measurement precision from 1" (3sigma) to 0.6" (3sigma).

Description

technical field [0001] The invention relates to a method for improving the attitude measurement accuracy of a multi-probe star sensor, belonging to the technical field of satellite attitude control. Background technique [0002] The star sensor obtains the star observation vector by imaging the stars in space, uses the star map matching method to determine the direction of the star sensor optical axis in the inertial space, and uses the conversion relationship between the star sensor body coordinate system and the satellite attitude coordinate system to determine the satellite attitude. [0003] The starting point of the multi-probe star sensor design is to benefit from the measurement data output by multiple probes, which can improve the accuracy and robustness of the star sensor. In his attitude determination algorithm research, he proposed the concept of data fusion. Its significance lies in the fusion of measurement data of various fields of view to achieve high-precis...

Claims

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Application Information

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IPC IPC(8): G01C25/00G01C21/02
CPCG01C21/025G01C25/00
Inventor 程会艳郑然武延鹏张腾飞隋杰关健彭宇李圣龙熊军李玉明王苗苗蒋志雄刘山山曹哲赵江涛王玉爽
Owner BEIJING INST OF CONTROL ENG
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