Dr. Nan Liang Profile

Dr. Nan Liang

at Beijing Institute of Space Mechanics & Electricity

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Publications (4)

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Proceedings Article | 27 March 2022 Paper

Analysis and research on grounding technology of new remote sensing camera

Caili Shen, Nan Liang

Proceedings Volume 12169, 121693L (2022) https://doi.org/10.1117/12.2623780

KEYWORDS: Remote sensing, Cameras, Space operations, Satellites, Electromagnetic interference, Electromagnetism, Standards development, Signal processing, Analytical research, Power supplies

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As the main load of remote sensing satellite, the performance of remote sensing camera directly affects the performance of remote sensing image data. The working environment of remote sensing camera is harsh space, which is full of various space environmental effects. Among them, the charge and discharge effect will lead to the accumulation of charge in the remote sensing camera, resulting in high-voltage discharge, resulting in the damage of electronic products in the camera. In addition, the continuous improvement of miniaturization and integration of remote sensing camera leads to the worse electromagnetic environment of remote sensing camera electronics system. Good grounding can reduce the electromagnetic interference caused by electromagnetic environment and other forms of inductive coupling, and ensure the safe and stable operation of remote sensing camera system. Firstly, this paper briefly introduces several common grounding methods, and compares and analyzes their specific implementation methods and differences. Then, combined with the relevant standards and specifications at home and abroad and the actual needs, this paper introduces the selection standards and reasons of aerospace grounding mode, as well as the current situation of satellite grounding. Then, according to the characteristics of the new remote sensing camera, such as the high-speed, high-frequency and integration of visible focal plane electronics, and the integration of high-power electronics products in the camera, a new hybrid grounding scheme is proposed in this paper. The scheme not only considers the current status of satellite grounding, but also integrates the relevant grounding standards and principles at home and abroad. The new hybrid grounding scheme can meet the high-performance needs of remote sensing cameras in the future.

Proceedings Article | 27 March 2022 Paper

Research on the test methods of charge accumulating TDICMOS sensor

Liang Nan, Li Xin

Proceedings Volume 12169, 121693X (2022) https://doi.org/10.1117/12.2623921

KEYWORDS: Sensors, Interference (communication), Analog electronics, Amplifiers, Signal detection, Quantization, Video, Testing and analysis, Remote sensing, Light sources

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With the increasing demand for high resolution, high speed transmission and low power dissipation in space remote sensing, TDICMOS detector based on charge accumulating will become an important part of video detectors. No matter in process or in structure, the detector is essentially different from the traditional TDICCD and CMOS detector with digital accumulating. Therefore, many original methods of testing the performance parameters of the detector cannot be applied to the TDICMOS detector based on charge accumulating. This paper proposes the test methods of Charge-DN Factor, Full Well Charges, Transfer Efficiency, Readout Noise based on TDICMOS characteristics. We also verify these test methods by experiment, proves the correctness of these testing methods and the feasibility of the engineering. The results provides an important basis for the application of TDICMOS camera in the future.

Proceedings Article | 12 March 2021 Paper

Research on hybrid TDI accumulation technology base on image registration

Liang Nan, LiYang Zhai

Proceedings Volume 11763, 1176307 (2021) https://doi.org/10.1117/12.2585560

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With the increasing of the line frequency in the field of high resolution space remote sensing, the energy of the camera decreases gradually in an integral time, and the imaging ability of the camera in weak light decreases. Therefore, it is necessary to increase the number of TDI stages to make up for the lack of energy. The existing traditional digital domain accumulation will inevitably lead to excessive noise, while the charge domain is affected by sensor process, it can not achieve large series accumulation. This paper first proposes an accumulation method based on the hybrid of charge domain and digital domain. The main indexes that affect the image quality of weak light imaging are analyzed. Then,aiming at the degradation of image quality between multi sensitive units under the mode of hybrid domain accumulation, an imaging time adjustment method based on image registration is proposed. This method can effectively improve the mismatch between the charge motion and the scene motion. Finally, through the roller target test in the laboratory and the location imaging, this paper verifies the effectiveness of the imaging time adjustment method and the enhancement effect of imaging ability under weak light. The results show that the proposed method can effectively solve the main bottleneck problem of ultra-high resolution imaging in charge domain and digital domain, This paper provides an effective solution for the development of ultra-high resolution camera in the future.

Proceedings Article | 12 March 2021 Paper

Research on anti-SEU strategy for remote sensing camera based on SRAM-FPGA

Caili Shen, Nan Liang

Proceedings Volume 11763, 1176308 (2021) https://doi.org/10.1117/12.2585565

Read Abstract +

In order to meet the demand of high performance development of remote sensing camera, the design of camera software is becoming more and more complex. In this way, the large-scale processing devices, such as SRAM-FPGA demand is increasing. However, due to the complex space radiation environment faced by remote sensing cameras, especially the Single-Event Upset (SEU) effect, it has a great impact on SRAM devices, which may easily lead to abnormal system operation or functional interruption. In this paper, several commonly used strategies to deal with the SEU of SRAM-FPGA were studied, and their advantages and disadvantages were compared and analyzed respectively. Based on the characteristics of remote sensing camera mission, a comprehensive strategy of SEU-tolerant was proposed, and the implementation methods and the flow chart were given. Finally, this paper used the common fault injection method to verify the correctness and effectiveness of the strategy. It was proved that this strategy could well meet the mission needs of remote sensing cameras and provide a new way to upgrade the functions of remote sensing cameras in the future.

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