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Correction of the relative thermal deformation of dual star sensors for remote-sensing satellites

  • role： First author第一作者
  • Affiliation：

    Shanghai Institute of Spaceflight Control Technology, Shanghai Key Laboratory of Spacecraft Intelligent Control Technology, Shanghai 201109, China

  • Email：zhongjinfeng822@126.com
  • Introduction：钟金凤(1985—　)，工程师，研究方向为卫星控制系统。E-mail：zhongjinfeng822@126.com
Jinfeng ZHONG,  
  • Affiliation：

    Shanghai Institute of Spaceflight Control Technology, Shanghai Key Laboratory of Spacecraft Intelligent Control Technology, Shanghai 201109, China

Siyan GUO,  
  • Affiliation：

    Shanghai Institute of Spaceflight Control Technology, Shanghai Key Laboratory of Spacecraft Intelligent Control Technology, Shanghai 201109, China

Jingyu WU,  
  • Affiliation：

    Shanghai Institute of Spaceflight Control Technology, Shanghai Key Laboratory of Spacecraft Intelligent Control Technology, Shanghai 201109, China

Jiarui PEI,  
  • Affiliation：

    Shanghai Institute of Spaceflight Control Technology, Shanghai Key Laboratory of Spacecraft Intelligent Control Technology, Shanghai 201109, China

Yansheng JIA

Resümee

A high-accuracy satellite platform is required to obtain remote-sensing images that meet the requirements of high image quality and high resolution for payload imaging. In practical engineering applications, the thermal deformation error caused by the thermal environment of star sensors is always neglected. Therefore, relative thermal deformation between star sensors will negatively affect altitude determination by dual sensors. Thus, the thermal deformation error must be identified and corrected. In this study, the thermal deformation model is established on the basis of satellite remote-sensing data and then corrected. The parameters of the thermal deformation model established using the Fourier series reflect the real results of on-orbit thermal deformation, and the magnitudes of sinusoidal and cosine functions in the Fourier series are determined. Then, the estimated parameters are used to compensate for the output of star sensors. Comparing the altitude error of star sensors before and after correction revealed that measurement precision improved by 40% after correction. Results showed that the proposed method for thermal deformation correction can improve the measurement precision of star sensors and reduce the influence of slow-frequency error on the precisions of altitude determination. The proposed method has potential engineering applications for obtaining high-quality images.

Schlüsselwort

remote sensing satellite;dual star sensors;thermal deformation;on-orbit correction;measurement precision

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