Simulation algorithm of echo waveform of laser pulse with large footprint

Abstract

An echo waveform artificial algorithm of wide foot print laser pulse includes decomposing emitted laser pulse to be innumerable Gauss pulses incoming to various points on wide footprint, receiving these Gauss pulses by laser height gauge after said Gauss pulses are emitted by corresponding point of wide footprint in order to obtain product formula of echo power corresponding to laser pulse, carrying out topographic division to obtain simple formula of said echo power and programming to obtain waveform of wide footprint laser pulse echo.

Description

Technical field: [0001] The invention relates to high-level simulation of space-borne laser altimeter measurement in aerial exploration, in particular to a simulation algorithm for large-footprint laser pulse-echo waveforms. Background technique: [0002] In aerospace science and technology, it is an indispensable technology to obtain the height data of the detection target through laser altimetry. For example, the laser altimeter, one of the important payloads of the spacecraft "Chang'e-1" satellite in the first phase of China's "Chang'e" lunar exploration project, will use active laser altimetry technology to measure the distance from the satellite to the nadir point on the lunar surface, and obtain After the data is processed by the ground application system, the height data of the lunar surface can be obtained, and combined with the photographed lunar texture photos, the three-dimensional terrain of the moon can be obtained. This not only further deepens the understandi...

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Problems solved by technology

[0003] However, due to the limitations of experimental conditions and the lack of information shared internationally on lunar exploration, it is not easy to conduct a satellite flight test to verify some theoretical research. Know some features, get some prior knowledge theoretically

However, at present, the simulation of laser altimetry echo waveforms at home and abroad is mainly focused on airborne laser altimetry. In this case, the distance between the laser altimeter and the measured target is only a few kilometers, resulting in a small laser spot (ie, laser footprint) , the general area is less than 1m 2 , and it is easy to test, and the simulation model can be verified and modified in combination with the actual situation, so the simulation of laser pulse echo with small footprints is relatively mature, and in terms of large footprints, because the laser altimeter is generally several hundred kilometers away from the detection celestial body, the corresponding The area of ​​the laser spot is as large as tens of thousands of square meters, and the test cost is high. The theoretical research on the airborne aspect is no longer suitable for the long-distance situation of large footprints. According to the survey, there is no special research in this area in China, and research in this area abroad also revealed little

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