Orthogonal Polarization Multiplexing Synthetic Aperture Imaging Lidar

Abstract

Provided is a phase encoding cross-polarization synthetic aperture laser imaging radar which comprises a laser light source, a fiber polarization beam splitter, a first optical phase modulator, a second optical phase modulator, a microwave signal waveform generator, a microwave amplifier, a first fiber collimator, a second fiber collimator, a first along-rail cylindrical lens, a second along-rail cylindrical lens, a emission polarization beam combiner, an emission primary mirror, a receiving telescope, a receiving half-wave plate, a receiving polarization beam splitter, a reflector, a balance detector, an A / D converter, and a signal acquiring and processing computer. The phase encoding cross-polarization synthetic aperture laser imaging radar have same advantages with an orthophoria synthetic aperture laser imaging radar, is not provided with a moving optical element so as to avoid errors and noise of mechanical elements for driving an optical element to move, uses reciprocal half-code phase modulation, reduces voltage values loaded onto the optical phase modulators, changes the encoding speed of the microwave signal generator, namely changes the system cross-rail resolution, and is high in flexibility.

Description

technical field [0001] The invention relates to a synthetic aperture laser imaging radar, in particular to a phase coded orthogonal polarization synthetic aperture laser imaging radar. Background technique [0002] In the field of coherent range-Doppler lidar imaging and scanning 3D imaging lidar, various phase encoding waveforms are usually used to obtain the relative distance information of the detection target, and the waveform compression processing based on matched filtering is the key to obtaining relative distance information from the phase encoding waveform The only means of information processing. [0003] Prior art [1] (Beck S M, Buck J R, Buell W F, et al.. Synthetic-aperture imaging laser radar: laboratory demonstration and signal processing [J]. Applied Optics, 2005, 44 (35): 7621-7629) The synthetic aperture laser imaging radar works in the side-view mode, emits chirp laser pulses, performs optical heterodyne reception with the chirp pulses that are locally sp...

AI Technical Summary

Problems solved by technology

However, this scheme only places an optical phase modulator on one of the two paths. The optical elements passed by the two orthogonally polarized paths are different, and the initial phase between the pulses will change, which will introduce a phase error between the two orthogonally polarized paths and affect the imaging results; And this scheme uses a large number of space optical body elements, so that the system has higher requirements for assembly accuracy and stability

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