Beam Tracking Method Based on Fixed Frequency Decoupling of Satellite Platform
A satellite platform and decoupling technology, applied in the field of laser communication, can solve problems such as inability to track beams of composite axes, and achieve the effects of improving tracking performance, stable tracking, and excellent tracking accuracy
Active Publication Date: 2021-12-28
NANJING INTANE OPTICS ENG
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[0012] The purpose of the present invention is to provide a beam tracking method based on fixed-frequency decoupling of the satellite platform, aiming at the technical problem that the micro-satellite platform cannot combine the axis beam tracking in the ground-to-ground laser communication tracking. , which reduces the influence of low signal transmission rate between the platform and the laser communication terminal on real-time control, realizes the high-precision compound control of coarse aiming and fine aiming, and can effectively improve the tracking performance of the satellite-to-earth laser link
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[0033] The beam tracking method based on the fixed-frequency decoupling of the satellite platform described in this embodiment includes the following steps:
[0034] Step 1. Before the satellite-to-ground laser link is captured, the laser communication terminal calculates the average aiming angular rate of the satellite-to-ground laser link period according to the satellite orbit and attitude prediction data ,in is the average angular rate along the azimuth axis, is the average angular rate along the pitch axis;
[0035] Step 2. Calculate the decoupling amount at each moment in the satellite-earth link period at intervals of 10 ms[ , ], where n represents the number of time intervals, s is the time unit second, and the link start time Time n=0, the time in the link process time , before the link starts, the Send to the satellite platform;
[0036] Step 3. After the laser communication terminal completes the beam capture, it controls the precise pointing device...
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The invention provides a beam tracking method based on satellite platform fixed-frequency decoupling. The method of the present invention includes step 1, before the satellite-ground laser link is captured, the laser communication terminal calculates the average aiming angular rate of the satellite-ground laser link period; The decoupling amount at the time is sent to the satellite platform; step 3, after the laser communication terminal completes the beam capture, control the fine pointing device and the CMOS detection device to perform photoelectric closed-loop fine tracking, the satellite platform calculates the n value according to the platform clock, and starts according to the decoupling amount Fixed-frequency decoupling; step 4, during the tracking process, the laser communication terminal calculates the average residual angle error of the CMOS detector as the decoupling correction value, and sends it to the satellite platform for fixed-frequency correction; step 5, the satellite platform uses the corrected solution The coupling quantity continues to be fixed-frequency decoupling and fixed-frequency correction until the end of the link. The invention can effectively improve the satellite-ground laser link tracking performance.
Description
technical field [0001] The invention relates to a beam tracking method based on fixed-frequency decoupling of a satellite platform, belonging to the technical field of laser communication. Background technique [0002] Compared with the existing microwave communication technology, satellite laser communication technology has significant advantages such as high data rate, anti-interference and good confidentiality, and can realize high-speed downlink transmission of remote sensing data from satellite platforms. [0003] The current satellite laser communication terminals generally weigh in the order of 10kg to 50kg and consume about 100W. Most of them are installed on low-orbit satellites or high-orbit satellite platforms. In recent years, with the development of space-based Internet, the application of micro-satellites in space has become more and more extensive. The weight of the microsatellite platform is generally 100 to 500kg. In addition to the weight of the platform i...
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IPC IPC(8): H04B10/118
CPCH04B10/118
Inventor 吴世臣黎发志权振陈彧龙王安解学彬周子元
Owner NANJING INTANE OPTICS ENG