A target extraction and tracking camera and method for an inter-satellite laser communication pat system

Abstract

The invention discloses a target extraction and tracking camera and method of an inter-satellite laser communication PAT system. The present invention integrates the three functions of detector driving and data processing, target detection and extraction, and galvanometer control and tracking in both software and hardware, which can reduce the delay of off-target amount, improve the system closed-loop control bandwidth, and further improve the tracking of the PAT system precision. The basic working principle of the camera is: the short-wave infrared detector receives the beacon light from Jingxin, and under the excitation of the analog voltage and the digital timing of the FPGA chip, it completes the detection and output of the Jingxin beacon light. The output signal passes through the amplification circuit and the analog The processing of the digital conversion circuit forms a digital image signal and enters the FPGA chip. The FPGA chip performs a series of processing on the digital image data, such as preprocessing of the digital image data, high-precision light spot extraction, and galvanometer control, and outputs digital quantities to the digital-to-analog converter to generate control voltages, and finally controls the fine-tracking galvanometer to complete high-precision, low-latency Gray beacon tracking.

Description

technical field [0001] The invention relates to the field of space laser communication, in particular to a target extraction and tracking camera and method of an inter-satellite laser communication PAT system. Background technique [0002] For the consideration of high speed, low power consumption and long distance, the inter-satellite laser communication system usually emits the communication light close to the diffraction limit (10μrad~30μrad). Affected by factors such as inter-satellite relative motion, satellite platform vibration, and satellite attitude, it is difficult for inter-satellites to directly use extremely narrow-angle communication light to complete the establishment and maintenance of high-speed communication links. In order to realize inter-satellite high-speed laser communication with a link distance of tens of thousands of kilometers, the initial pointing (Pointing), beam scanning acquisition (Acquisition), and beam tracking (Tracking) system, that is, th...

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Problems solved by technology

[0008] In view of the separation of the target extraction and the galvanometer control unit mentioned in the above background, the closed-loop control bandwidth of the system cannot be improved due to the delay of the off-target amount, which ultimately affects the problem that the tracking accuracy cannot be further improved; and the decentralized design of each functional module leads to the system The volume, power consumption, and weight cannot meet the requirements of the micro-satellite platform. The present invention provides a target extraction and tracking camera for the inter-satellite laser communication PAT system, and integrates the target extraction and galvanometer control function modules in terms of software and hardware. At the same time, it provides a target extraction and tracking method for the inter-satellite laser communication PAT system, which provides a strong guarantee for the lightweight and miniaturized design of the PAT system while improving the tracking performance of the system

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