Dual-channel electro-optical scanning direct-looking synthetic aperture imaging lidar launch system

Abstract

A bi-channel electrooptical scanning laser imaging radar transmitting system for down-looking synthetic aperture comprises a laser, a half wave plate, an aperture diaphragm, a first polarization beam splitter, a first electrooptical scanner, a first cylindrical mirror, a second polarization beam splitter, a first 1 / 4 wave plate, a first reflection mirror, a third polarization beam splitter, a second 1 / 4 wave plate, a second reflection mirror, a second electrooptical scanner, a second cylindrical mirror, a fourth polarization beam splitter, a transmitter-telescope primary mirror, a high-voltage power source and a signal generator. The bi-channel electrooptical scanning laser imaging radar transmitting system is capable of electro-optically scanning two channels of light beams and ultimately realizing parabolic equipotential line difference of two polarization orthogonal light beams at a far-field target, is used for scanning targets, simple in structure, free of mechanical scanning, small in size, light in weight, and particularly suitable for onboard or satellite-borne high-speed operating carrying platforms, and response speed for electrooptical phase modulation wave surfaces is fast and up to nanosecond level.

Description

technical field [0001] The invention relates to a laser radar, in particular to a dual-channel electro-optical scanning direct-view synthetic aperture laser imaging radar launching system, which is used as an optical transmitting device in the direct-view synthetic aperture laser imaging radar. The electro-optical scanner performs dual-line electro-optical scanning in the cross-track direction to generate linear phase modulation of the cross-track to the lateral position of the target point, and the cylindrical mirror performs phase modulation in the on-track direction to generate the vertical position of the on-track to the target point. The quadratic term phase history as the center, the parabolic isopotential phase difference wavefront with orthogonal polarization is finally obtained, which is the key technology to realize the imaging of radar two-dimensional plane target. Background technique [0002] The principle of synthetic aperture laser imaging radar is taken from ...

AI Technical Summary

Problems solved by technology

However, the emission system scheme proposed by the direct-looking synthetic aperture lidar is to use two beam deflectors to scan the two beams in opposite directions so that the light field distribution of the inner emission field is in the form of a quadratic spatial phase. Synchronization can obtain the linear phase modulation in the cross-track direction. It is difficult and complicated to make the precise synchronization of the two beams scanning oppositely. Applications on high-speed platforms such as airborne

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