Mr. Shijian Tang Profile

Shijian Tang

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Proceedings Article | 13 December 2024 Paper

High image quality and light-small commercial remote sensing camera design

Shijian Tang, Wei Huang, Xinglin Zheng, Jiaohong Shi, Xinhao Lian

Proceedings Volume 13496, 1349606 (2024) https://doi.org/10.1117/12.3045587

KEYWORDS: Cameras, Temperature control, Design, Star sensors, Signal to noise ratio, Mirrors, Image quality, Remote sensing, Thermal stability, Control systems

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A high image quality light-small remote sensing camera design conception is proposed to satisfy the requirement of the high resolution, light weight and high image quality commercial applications. Adopting three mirrors reflection coaxial optical system, combined with light weight, high stable opto-mechanical and TDICMOS imaging circuits, is achieving the design result of 80Kg weight and 150watt power consumption. and acquires images through push-broom mode. To achieve the high SNR, the Precision Loop Heat Pipe (LHP) is adopted to keep the TDICMOS sensor operating under stable and low temperature, and the fixed pattern noise is statistically analyzed in the lab and then removed by onboard processor in real time. For MTF, Modulation Transfer Function Compensation (MTFC) algorithm is used to improve the final MTF value. The interior orientation elements stability is achieved by dedicated design of reflection mirror and its supporting structure, and indirect high precision thermal control for opto-mechanical structure. The star sensor brackets are directly mounted on the primary camera structures, meanwhile, the thermal and stiffness performance of which is specially designed to keep the exterior orientation elements stable. The final design gives the result of the 48dB for SNR, 0.15 for static MTF and high geometrical stability.

Proceedings Article | 5 November 2020 Paper

The camera control technology of high reliability and multichannel imaging

Shijian Tang, Kai Li, Jian Wang, Fengping Chai

Proceedings Volume 11567, 1156725 (2020) https://doi.org/10.1117/12.2579779

KEYWORDS: Cameras, Control systems, Infrared imaging, Sensors, Infrared sensors, Satellites, Reliability, Imaging systems, Remote sensing

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The camera control system is the most important part of the space remote sensing camera. Due to the products in the camera of the Marine Satellite or the Meteorological Satellite are easily disturbed by the space environment, it is necessary to develop a high-reliability camera control technology to guarantee the camera reliable and long-life operation in orbit. Firstly, in this paper, a dynamic reconfiguration technology of a serial bus based on multi-node and extensible ways is carried out, and a fault detection and automatic recovery technology based on error detection and correction of hamming code and the periodic automatic refresh technology are applied. Meanwhile, the camera control system not only apply the single event immune memory to storage original program safely, but also carry out on-orbit maintenance technology which include parameter and program on-line reloading for the facilities in the whole camera, including control system itself. Secondly, In order to ensure the safety of infrared detection component, the control technology of early over-temperature warning and self-protection is also applied. Ultimately, The autonomous and interactive control technology of the multi-process imaging is developed for the multichannel camera, it can facilitate user to complete the imaging process to relay on ‘shortcuts’. Within conclusion, in this paper, The camera control technology realized can not only effectively guarantee the camera to cope with the harsh space environment, but also solve the convenience of users of the complex camera system, and it provides a technical guide for future development of space remote sensing camera control system.

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