Satellite laser range-measurement system based on tilt correction

Abstract

A satellite laser distance measurement system based on tilt calibration is featured as setting high speed tilt reflector in telescoping unit, using tilt tracking transducer to carry out wave front detection on light wave received by receiving telescope, outputting calibration control signal to high speed tilt mirror in telescope by high speed processor after error signal is restored, starting up satellite laser distance measurement system in telescoping unit to send out laser with specific wavelength for carrying out satellite laser distance measurement after tilt closed loop real time calibration is finished.

Description

technical field [0001] The invention is a system for high-precision laser satellite ranging, which is used for real-time correction of atmospheric turbulence and tilt tracking jitter introduced by the telescope itself so as to improve the pointing accuracy of the satellite. Background technique [0002] Satellite Laser Ranging (SLR) is a technical means initiated by NASA in the early 1960s to use space technology to study geodynamics, geodesy, geophysics and astronomy. The characteristic of the laser ranging satellite is that a corner reflector is installed on the surface of the satellite to reflect the laser emitted by the ground station. The ground station uses the receiving telescope to receive the laser returned from the satellite corner reflector, and uses the time interval counter to measure the time required for the laser to go back and forth, so that the distance from the ground station to the satellite can be accurately obtained. In the calculation process, the spe...

AI Technical Summary

Problems solved by technology

The disadvantage of this satellite laser ranging scheme is that satellites at different altitudes are affected by different perturbations, and their orbit prediction accuracy is also different. The prediction accuracy of high-orbit satellites is better than that of low-orbit satellites. Accuracy makes the tracking accuracy of satellites insufficient when performing satellite laser ranging, especially for low-orbit (orbital height < 800km), the fast target pointing accuracy will be worse

[0004] Xiang Qingge, Wei Zhibin, Cheng Bohui, Qu Feng, Wang Tanqiang and others designed an adjustable divergence angle system ("Design of divergence angle system for satellite laser range finder", 2004). For low-orbit satellites, by increasing the divergence The angle sacrifices the echo intensity to increase the probability of capture, but this puts forward higher requirements on the output power of the laser light source, and the utilization rate of laser energy is low, there are still too many uncertain factors, and there is no key to solving the problem

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