Capturing system based on signal light

Abstract

The invention discloses a capturing method based on a signal light and a capturing system based on a signal light. A signal light capture technology is used, aiming is initialized according to the prediction position of the ephemeris, an optimal uncertain area is determined, a scanning path is set, each area in the uncertain area is scanned by using a fine tracking fast reflector, and image processing is performed by using a gray scale enhancement method, so that the signal-to-noise ratio is improved, the signal capture difficulty is reduced, and the capture time is shortened. According to theinvention, the communication beam, namely signal light, is used as an alignment beam; A beacon light transmitting system and a beacon light receiving system of an existing active communication terminal are omitted, a target or an indicator light of a reverse modulation terminal is omitted, the system structure is effectively simplified, the size, the weight and the power consumption of the systemare reduced, and the applicability of the free space laser communication system to a small platform and a movable platform is improved.

Description

technical field [0001] The invention relates to the technical field of laser capture scanning, in particular to a capture system based on signal light. Background technique [0002] 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 satellite communication terminal, and is also one of the keys to the success of inter-satellite laser communication. [0003] At present, aeronautical communication is mainly realized through microwave satellites. When communicating through the mi...

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

[0016] 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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