A Method for Improving Dynamic Accuracy of Space Pointing Measurement Sensor

Abstract

The invention relates to a method for improving the dynamic accuracy of a space pointing measurement sensor, which belongs to the field of pointing measurement sensors for space vehicles. The piezoelectric micro-movement stage is used to support the photodetector of the sensor to form an image stabilization system; when the sensor rotates, the micro-motion stage drives the detector to perform compensation movement during image exposure, reducing star point imaging smearing; after the image exposure is completed , combined with the precise displacement feedback of the micro-motion table, the exact coordinates of the star point are given, and the measurement results are calculated and output based on the exact coordinates of the star point. The invention improves the star point positioning accuracy of the dynamic downward pointing measurement sensor through image stabilization, thereby improving the dynamic accuracy of the sensor.

Description

technical field [0001] The invention belongs to the field of pointing measurement sensors for space vehicles, and relates to a method for improving the dynamic accuracy of a space pointing measurement sensor. Background technique [0002] The space pointing measurement sensor is based on the imaging detection of point light sources in space, and measures the target pointing measurement information and its own three-axis attitude information. Because of its high precision and high reliability, it is widely used in various spacecraft such as satellites and spacecraft. . The spatial pointing measurement sensor extracts and matches the image spots of the captured image, and then calculates the pointing and attitude information. The coordinate information obtained by image spot extraction is the basis for pointing and attitude information calculation. In actual use, affected by the angular velocity of the spacecraft, the point light source will be generated at the imaging positi...

AI Technical Summary

Problems solved by technology

The coordinate information obtained by image spot extraction is the basis for pointing and attitude information calculation. In actual use, affected by the angular velocity of the spacecraft, the point light source will be generated at the imaging position of the image surface of the sensor and within the integration time of the photodetector. Changes, such as speckles produce tailing, reduce the signal-to-noise ratio of imaging detection, and directly affect the dynamic accuracy of pointing and attitude measurement

[0003] The existing space pointing measurement sensor achieves the dynamic accuracy index of the sensor by reducing the integration time, increasing the aperture of the optical system, improving the performance of the detector, complex image processing, etc., and the effect is not good.

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