Target extraction and tracking camera and method for 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 three functions of detector driving and data processing, target detection and extraction and galvanometer control tracking are integrally designed in the two aspects of software and hardware, the miss distance delay can be reduced, the closed-loop control bandwidth of the system is improved, and the tracking precision of the PAT system is further improved. The basic working principle of the camera is as follows that: a short-wave infrared detector receives fine beacon light, detection and output of the fine beacon light are completed under the excitation of analog voltage and a digital time sequence of an FPGA chip, and an output signal is processed by an amplifying circuit and an analog-to-digital conversion circuit to form a digital image signal to enter the FPGA chip. Digital image data are subjected to a series of processing such as preprocessing, high-precision light spot extraction and galvanometer control in the FPGA chip, digital quantity is output to the digital-to-analog converter to generate control voltage, and finally a fine tracking galvanometer is controlled to complete high-precision and low-delay fine beacon light 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...

AI Technical Summary

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

Images