Optical System Design of Star Camera with High Precision Better than Second Level

Yanxiong, 伍雁雄 Wu; Hongbo, 吴洪波 Wu; Jizhen, 张继真 Zhang; Lingjie, 王灵杰 Wang; Yang, 朱杨 Zhu; Xin, 张鑫 Zhang

doi:10.3788/cjl201542.0716001

Cited by 2 publications

(2 citation statements)

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“…Since there was an installation angle error between the satellite attitude and the imaging coordinate systems, it was necessary to rotate the former to obtain the latter. According to the subsecond installation accuracy in [18] and the method of coordinate system conversion in [40], the fixed transformation matrix M was constructed. The attitude and the optical axis change in the imaging system were correspondingly solved through the internal or external rotation of the coordinate system, and the optical axis of the optical system was obtained.…”

Section: Image Pixel Offset Calculation Principlementioning

confidence: 99%

“…There has also been research into the attitude of high-orbit targets through space-based observation facilities [15] and using a new fiberoptic gyroscope design to improve the zero-bias stability and measurement accuracy [16]. Some research groups adopted the new optical design of a high-precision star camera and high-precision measurement method [17,18] and achieved an angle measurement accuracy of 1.5 × 10 −4• , but the output frequency of high-precision data was limited, generally in the range of 10-20 Hz. Some studies have pointed out that the frame frequency of complementary metal oxide semiconductor (CMOS) detectors in remote sensing can be as high as 500 Hz [19,20].…”

Section: Introductionmentioning

confidence: 99%

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Prediction Algorithm for Satellite Instantaneous Attitude and Image Pixel Offset Based on Synchronous Clocks

Lingfeng

Dong

2022

Remote Sensing

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To ensure a high signal-to-noise ratio and high image volume, a geostationary orbiting ocean remote-sensing system needs to maintain high platform stability over a long integration time because it is affected by satellite attitude changes. When the observation target is the ocean, it is difficult to extract image features because of the lack of characteristic objects in the target area. In this paper, we attempt to avoid using image data for satellite attitude and image pixel offset estimation. We obtain the satellite attitude by using equipment such as gyroscopes and performing time registration between the satellite attitude and the image data to achieve pixel offset matching between images. According to the law of satellite attitude change, we designed a Kalman-like filter fitting (KLFF) algorithm based on the satellite attitude change model and the Nelder–Mead search principle. The discrete attitude data were time-marked by a synchronization system, and high-precision estimation of the satellite attitude was achieved after fitting with the KLFF algorithm. When the measurement accuracy of the equipment was 1.0 × 10−3°, the average prediction error of the algorithm was 1.09 × 10−3°, 21.58% better than the traditional interpolation prediction result of 1.39 × 10−3°. The peak value of the fitting angle error reached 2.5 × 10−3°. Compared with the interpolation prediction result of 6.2 × 10−3°, the estimated stability of the satellite attitude improved by about 59.68%. After using the linear interpolation method to compensate for the estimated pixel offset, its discrete range was 0.697 pixels. Compared with the 1.476 pixels of the interpolation algorithm, it was 52.8% lower, which improved the noise immunity of the algorithm. Finally, a KLFF algorithm was designed based on the satellite attitude change model by using external measurement data and the synchronous clock as a benchmark. The instantaneous attitude of the satellite was accurately estimated in real time, and the offset matching between the images was realized, which lays the foundation for in-orbit satellite data processing.

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Section: Image Pixel Offset Calculation Principlementioning

confidence: 99%