Design and data processing of TDICCD real-time radiation correction system

Ning Yonghui; Shi Junxia; Liu Chunxiang

doi:10.12086/oee.2019.190112

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Ning Yonghui, Shi Junxia, Liu Chunxiang. Design and data processing of TDICCD real-time radiation correction system[J]. Opto-Electronic Engineering, 2019, 46(12): 190112. doi: 10.12086/oee.2019.190112

Citation:

Ning Yonghui, Shi Junxia, Liu Chunxiang. Design and data processing of TDICCD real-time radiation correction system[J]. Opto-Electronic Engineering, 2019, 46(12): 190112. doi: 10.12086/oee.2019.190112

Design and data processing of TDICCD real-time radiation correction system

Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130031, China

Fund Project: Supported by Civil Aerospace Pre-research Project (D040101)

More Information

Corresponding author: Ning Yonghui, E-mail: way007@163.com

Received Date 16 March 2019

Revised Date 31 May 2019

Published Date 01 December 2019

Abstract

Abstract

In order to increase the lifetime of the TDICCD imaging system in space and decrease the impact on the imaging quality for a long-time working in orbit, a system of real-time radiation correction in space is designed. It generates real-time correction parameters of multi-TDICCD channels and pixels in-channel by rotating the focus plane before the calculation of the real-time calibration images, and improves the adaptability and PRNU (pixel response non-uniformity) values of the TDICCD mosaic camera imaging system. FPGA is used to calculate and save the parameters, and an optimization design is implemented to improve the system stability and reliability. This method can calculate the real-time PRNU correction parameters of the TDICCD mosaic camera in-orbit, and the PRNU value of TDICCD mosaic camera in-channel reaches 2.01% after real-time calibration. This method is potentially used in real-time radiation calibration, and has got a better result.
- TDICCD /
- real-time radiation correction /
- PRNU /
- memory control /
- FPGA

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References

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Overview

Overview

Overview: As to the radiation calibration process of the TDICCD mosaic imaging system in space, it rotates the focus panel of the camera 90 degrees, and then takes photos to the ground radiation calibration field, getting the real-time calibration images of the TDICCD mosaic system. It corrects the TDICCD PRNU with 1-spot algorithm based on the real-time calibration images, and calculates the differences among the pixels and the channels. It verifies the performance of the real-time pixel correction algorithm in space, and enhances the specifications of the TDI-CCD mosaic system.

When rotating the camera focus panel, for all the pixels of TDICCD pointing to the same spot-scene group in the ground calibration field, it makes sure that the real-time radiation calibration could get better results if the ground calibration filed is of the same attribute in reflectivity. We analyse the control method of the imaging period, give the final calculation method by the use of the calibration imaging data, and finally describe the relationship between the calibration field range and the valid calibration imaging data positions. These descriptions give a detail design method of the real-time calibration correction system in space.

The proposed method can distinguish the strange pixels and the normal pixels in TDICCD mosaic system, which gives processing methods separately when using 1-spot algorithm to implement the TDICCD real-time calibration correction system. Considering the efficiency of the TDICCD pixel correction parameters got in ground calibration, a tactic is designed to enhance the reliability of the real-time pixel correction parameters; meanwhile, we design the diagram of the real-time calibration algorithm and the control flow in Xilinx FPGA, which gives a detail description of the pixel correction parameters storage and applications methods.

FPGA is used to calculate and save the parameters, and an optimization design is implemented to improve the system stability and reliability. We enforce the simulation experiments in lab with respect to the real-time radiation calibration algorithm, and give a comparison among different imaging calibration cases, such as ground calibration experiments, real-time calibration simulation experiments, and no calibration experiments. The results show that the real-time radiation correction algorithm could improve the performances of the PRNU in TDICCD mosaic system, and the PRNU of the TDICCD mosaic camera system in-channel reaches 2.01% after real-time calibration. This method is useful in real-time radiation calibration, and could get a better result in project.