Multi-wavelength synthesized aperture laser imaging radar

Abstract

The invention discloses a multi-wavelength synthesized aperture laser imaging radar. The multi-wavelength synthesized aperture laser imaging radar consists of a multi-wavelength chirp laser emitter and an optical heterodyne receiver which are in one time sequence, wherein the laser emitter periodically emits chirp laser pulse beams having different start wavelengths through one or more space channels; and the optical heterodyne receiver receives a target laser echo signal and performs image processing once so as to finally generate a target image of the aperture laser imaging radar and outputthe target image. The multi-wavelength synthesized aperture laser imaging radar effectively increases the receiving probability of the target laser echo signal and avoids the influence of the change of laser speckle strength.

Description

Technical field [0001] The invention involves the laser imaging radar of the synthetic aperture, especially a multi -wavelength synthetic aperture laser imaging radar. Background technique [0002] Laser imaging radar (referred to as optical SAR) is the only optical imaging observation method that can obtain centimeter -level imaging resolution at a long distance.The content is completely different. The implementation methods and key technologies of optical SAR and microwave SAR are completely different. The antenna of synthetic aperture laser imaging radar uses an optical telescope.When the optical antenna is used for laser beam launch, its divergent angle is equivalent to the diffraction angle of antenna diameter. When the optical antenna is used for optical absence, its receiving field angle is also equivalent to the diffraction angle of antenna caliber. In general, optical receiving the antennaThe same caliber as the optical launch antenna (references 1, 2, 3, 4, 5) or the sa...

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Problems solved by technology

The amplitude fluctuation shows that the echoes of the target distribution unit are randomly distributed speckle, and the average scale of the speckle is equal to the scale of the diffraction spot of the resolution unit scale aperture, so the average area of ​​the speckle is larger than the area of ​​the receiving antenna, because the central position of the speckle The uncertainty of the optical receiver antenna may receive the speckle signal or may not receive the speckle signal at all, which will seriously affect the imaging quality

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