Study on the faint star extraction technology with MEMS gyro aided APS star tracker

Fei Xing; Borui Zhao; Ting Sun; Wei Xu; Zheng You

doi:10.1117/12.2034305

16 August 2013 Study on the faint star extraction technology with MEMS gyro aided APS star tracker

Fei Xing, Borui Zhao, Ting Sun, Wei Xu, Zheng You

Proceedings Volume 8912, International Symposium on Photoelectronic Detection and Imaging 2013: Low-Light-Level Technology and Applications; 891211 (2013) https://doi.org/10.1117/12.2034305
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

Star tracker is the most accurate attitude sensor for satellite. Generally speaking, the higher the accuracy, the fainter the star can be sensed by the star tracker. How to extract the faint star from a star image is becoming a critical technology in dynamic condition for star tracker, especially using the APS (Active Pixels Sensor) detector. A novel APS star tracker with MEMS Gyroscope aided system was proposed in this paper that could extremely improve the detection effect and capability for the faint stars. During the exposure time of star tracker, the trajectory of star projection on the detector maybe occupy more than ten pixels due to the satellite rotation. In this situation, the signal-to-noise ratio will decline sharply, and the traditional star extraction method for faint star will take no effect. As a result, the accuracy of star tracker would decline sharply, even more, couldn’t work. Using the MEMS Gyroscope, the track of star projection can be predicated and measured, on the basis of which the deconvolution algorithm could be taken to recover the faint star signal. The accuracy of the star projection centroid could be improved obviously, and the dynamic performance of the star tracker would be improved by a magnitude. Meanwhile, the MEMS gyroscope has not less volume, mass and power consumption, which make it more suitable for the application of APS star tracker.

Citation Download Citation

Fei Xing, Borui Zhao, Ting Sun, Wei Xu, and Zheng You "Study on the faint star extraction technology with MEMS gyro aided APS star tracker", Proc. SPIE 8912, International Symposium on Photoelectronic Detection and Imaging 2013: Low-Light-Level Technology and Applications, 891211 (16 August 2013); https://doi.org/10.1117/12.2034305

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KEYWORDS

Stars

Sensors

Gyroscopes

Point spread functions

Satellites

Microelectromechanical systems

Active sensors

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