Bi-channel electrooptical scanning laser imaging radar transmitting system for down-looking synthetic aperture

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-looking synthetic aperture laser imaging radar transmitting system, which is used as an optical transmitting device in a direct-looking synthetic aperture laser imaging radar. The electro-optic scanner performs dual-line linear electro-optic scanning in the cross-track direction to generate linear term phase modulation of the cross-track to the horizontal position of the target point, and performs phase modulation in the along-track direction through the cylindrical mirror to generate the longitudinal position of the target point along the track The quadratic term phase history centered on , and the finally obtained polarization orthogonal parabolic equipotential phase difference wavefront are the key technologies for realizing radar two-dimensional plane target imaging. Background technique [0002] The principle of synthetic aperture laser imaging ...

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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