Dr. Yongchang Li Profile

Dr. Yongchang Li

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Proceedings Article | 15 February 2022 Paper

Simulation and in-orbit verification of passive lunar calibration timing for Chinese ocean color satellite

Chao Wang, Yongchang Li, Jingyu Han, Qingjun Song, Keli Zhang, Jun Zhu, Lili Wang

Proceedings Volume 12166, 121662K (2022) https://doi.org/10.1117/12.2615549

KEYWORDS: Calibration, Satellites, Satellite imaging

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The lunar is a stable radiation source, which can be used as an ideal source for in-orbit calibration of remote sensors and evaluation of detector degradation performance. A passive lunar calibration method is proposed for Chinese ocean color satellite, which reuses field of view of cryogenic-deep-space calibration, periodically achieves monthly lunar calibration tasks. This work enriches ocean color satellite in-orbit calibration methods and improves data accuracy of products. The start and stop angle vector of cryogenic-deep-space, satellite-lunar pointing vector and imaging observation model are established in simulation software. The satellite and payload parameters are used as input conditions to carry out the simulation of the lunar calibration timing. The lunar calibration timing of payload COCTS (Chinese Ocean Color and Temperature Scanner) is simulated 00:00:00~24:00:00UTC on June 28, 2020. The result shows that lunar calibration was carried out for twice. The starting UTC (Universal Time Coordinated) time was 15:16:44 and 16:56:37, respectively. The duration was two seconds. Through analyzing the 0-level products of in-orbit satellite received by the application system, the cryogenic-deep-space data showed abnormal changes at 15:16:45 and 16:56:38 on June 28, 2020, and the DN (Digital Number) values dropped from 300 to 62 and 73, respectively. The in-orbit calibration timing is basically the same as the simulation results, and the numerical anomalies of cryogenic-deep-space data are consistent with the principle design, indicating that the simulation model can be used to predict the in-orbit lunar calibration timing of ocean color satellite. The analysis method can be used for cryogenic-deep-space imaging mission mode and payload design of the follow-up ocean color satellites.

Proceedings Article | 10 October 2019 Presentation + Paper

In-orbit lunar imaging and analysis for optical remote sensing satellite

Chunling Lu, Zhaoguang Bai, Yongchang Li

Proceedings Volume 11151, 111511N (2019) https://doi.org/10.1117/12.2532019

KEYWORDS: Satellites, Calibration, Satellite imaging, Cameras, Remote sensing, Image processing, Charge-coupled devices, Earth observing sensors

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This optical remote sensing satellite has a high-resolution PMS camera, which has a panchromatic band (PAN) and four multispectral bands (MS). The PMS camera do not contain onboard calibration subsystem. So, the satellite is designed to allow a three-axis attitude control system pointing the camera to the lunar. Through the lunar imaging, the cameras’ long-term stability of the radiances is hope to be evaluated. The lunar is known as an excellent radiometric reference because of the stable reflectance of its surface in the visible and near-infrared spectral regions. It is the nearest planet to the earth. In orbit lunar imaging does not rely on ground calibration site and weather. Although earth-orbit satellite lunar observation is efficient to monitoring camera’s radiation performance or achieving absolute radiation calibration, attitude control and imaging parameters matching problem should be solved. Some key points of lunar imaging were proposed to solve the mismatch of integration time and push-broom velocity. In addition, this paper summarizes the improved scheme for lunar imaging, obtains clear images at different lunar phase angles, and shows the preliminary results of the geometric parameters and irradiance of the lunar observation. It has accumulated experience in the follow-up satellite lunar observation.

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