Laser capture and communication system and method based on satellites

Abstract

The invention discloses a laser capture and communication system and method based on satellites, and the system comprises an active terminal and a retroreflection modulation terminal. The retroreflection modulation terminal is configured to capture and scan from inside to outside in a spiral manner within an uncertain angle range and monitor signal light emitted by the active terminal in real time by using a capture detector; and the active terminal and the retro-reflection modulation terminal are configured to perform bidirectional spiral scanning, so that the capturing detectors detect light spots of the opposite side, the positions of the light spots are stably kept in the centers of the capturing detectors of the two sides, and the tracking detectors detect the light spots at the same time, thereby tracking steering communication.

Description

[0001] The present invention is a divisional application with the application number 201811653096.6, the application date is December 29, 2018, the application type is invention, and the application name is a signal light-based capture system. technical field [0002] The invention relates to the technical field of laser capture scanning, in particular to a capture system based on signal light. Background technique [0003] Compared with the existing radio frequency communication, satellite laser communication has many advantages such as high transmission rate, large communication capacity, low power consumption, small size, light weight, anti-interference and high confidentiality. The best solution for communication has gained wide attention in the military and civilian fields. The optical tracking and pointing system plays an extremely important role in satellite laser communication terminals. The optical tracking and pointing system determines the basic structure of a sat...

AI Technical Summary

Problems solved by technology

However, due to the long distance between the transceiver and the atmospheric channel interference, the signal intensity of the beacon spot is redistributed and attenuated seriously, and finally the imaging spot on the focal plane of the CCD / CMOS detector appears as a "micro" target, usually only From a few to tens of pixels in size

In near-ground wireless laser communication, especially air-ground and ground-ground communication, the ground environment and background of the communication terminal are complex, which has a serious impact on the detection and capture of "micro" targets, which is likely to cause false alarms in target detection ( That is, misjudgment of the communication target), which eventually leads to the failure of target capture

The main manifestations are: ① When the brightness of the target is similar to the brightness of the background, the detector cannot judge the imaging spot of the target in the field of view, and thus cannot effectively detect the target

② When there are interference targets in the detector's field of view (such as a real target, other false targets (false targets can be released by the enemy) or multiple communication targets in the wireless optical communication network (other targets interfere with the current communication target) )), especially when the imaging spot brightness, size and shape of the communication target and the interference target are similar in the field of view of the detector, it is very easy to cause a false alarm in the detection of the communication target, which will eventually lead to the failure of the establishment of the communication link; it may even be related to the false The target communicates, resulting in the disclosure of confidential information

However, when this method is applied to signal light, it is difficult to capture and the capture time is long, which is difficult to meet the requirements of high-performance applications

[0017] Chinese patent (publication number is CN107707297A) discloses an aviation laser communication system, the main purpose is to solve the problem that aviation communication is restricted by frequency spectrum and bandwidth

However, this system must also use beacon light for capture, which makes the capture process cumbersome, increases the structural complexity of the capture system, and has poor applicability

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