A qd spot detection system and detection method based on data judgment correlation

Abstract

The invention provides a QD light spot detection system and detection method based on data judgment correlation. The system of the present invention includes a sending optical path, a receiving optical path, a QD detector, an analog processing board, a digital processing board, and a four-channel data judgment and signal correlation processing module and a spot resolution processing module arranged in the digital processing board. The invention correlates the judged data with the delayed DC elimination received signal, which overcomes the shortcomings of the traditional QD four-quadrant spot position detection: the traditional QD four-quadrant current detection is heavily dependent on the accurate estimation of the DC current; The noise in the image is effectively suppressed; the spot detection position deviates seriously in the environment of low signal-to-noise ratio. The invention is applied to the detection of the receiving optical axis of a space laser communication terminal, can significantly improve the accuracy of light spot detection, and meets the requirements for a QD light spot detector in a space laser communication high-sensitivity receiving environment.

Description

technical field [0001] The invention relates to a QD spot detection system and detection method based on data judgment correlation, which can effectively suppress DC drift and noise in QD spot position detection, and belongs to the field of space laser communication. Background technique [0002] In laser communication, the extremely narrow beam signal has the advantages of high antenna gain, small terminal size, and high transmission rate compared with traditional electromagnetic wave methods. With the continuous development of space information transmission technology, space laser communication has become an important means of inter-satellite high-speed communication. [0003] In an extremely narrow beam environment, it is a key technology in laser communication to ensure that two laser terminals point to each other accurately and maintain this pointing: APT tracking technology. In the APT tracking and aiming technology, it is an important link in the APT technology to qu...

AI Technical Summary

Problems solved by technology

[0006] In view of the disadvantages of traditional QD spot position detection under the integrated laser communication system without beacon light and tracking / communication: it is sensitive to DC drift in the receiving channel, and the spot position detection performance is poor under low signal-to-noise ratio. A QD spot detection system and detection method based on data judgment correlation

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