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

A light spot detection and judgment technology, which is applied in the transmission system, electromagnetic wave transmission system, electrical components, etc., can solve the problems of DC drift sensitivity, poor spot position detection performance, etc., and achieve the effect of reducing complexity, ensuring performance and reducing impact

Active Publication Date: 2021-09-28
NANJING INTANE OPTICS ENG
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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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  • A qd spot detection system and detection method based on data judgment correlation
  • A qd spot detection system and detection method based on data judgment correlation
  • A qd spot detection system and detection method based on data judgment correlation

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Embodiment Construction

[0067] Such as Figure 1-2 As shown, the QD spot detection system based on data judgment correlation in this embodiment 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 processing board arranged in the digital processing board. Signal correlation processing module and spot resolution processing module;

[0068] The transmitted data is output by the optical modulator and connected to the input end of the collimator by an optical fiber; the output signal of the collimator is firstly expanded through the beam expander; The galvanometer FSM completes the correction of the sending optical axis; the beam expander 2 realizes the angle compression and emission of the sending beam. The optical signal received from the space enters the receiving optical axis correction galvanometer FSM through the beam expander 2; the separation of the receiving and receiving optical si...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/67H04B10/69H04B10/11
CPCH04B10/11H04B10/67H04B10/691
Inventor 陈建华刘红恩葛红丽魏笑
Owner NANJING INTANE OPTICS ENG
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