Multi-subaperture optical receiving antenna system of synthetic aperture laser imaging radar
A technology of synthetic aperture laser and optical receiving antenna, which is applied in the direction of radio wave measurement system, electromagnetic wave re-radiation, instruments, etc. It can solve the problems of increasing the receiving aperture scale and affecting the imaging quality, and achieves small receiving field of view and large receiving The effect of large field of view and receiving area
Active Publication Date: 2013-01-23
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology
It should be noted that the laser speckle effect in the data collection process of the synthetic aperture lidar will cause additional phase and amplitude fluctuations of the target point echo, seriously affecting the imaging quality, and an important way to weaken the speckle effect is to increase the size of the receiving aperture , which in turn contradicts the requirement for a large optical footprint
Therefore, it is necessary to invent a solution that has a large energy receiving capability and an equivalent large-scale optical receiving antenna aperture that reduces speckle effects, but at the same time has a large heterodyne receiving field angle with a small-scale optical antenna aperture
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[0022] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.
[0023] see first figure 1 , figure 1 It is a schematic diagram of the multi-subaperture optical receiving antenna system of the synthetic aperture laser imaging radar of the present invention, and it is also a schematic diagram of an embodiment of the present invention. The working principle is shown in the figure, starting from the target echo beam 1 followed by the aperture stop 2, Receive main mirror 3 , multi-channel processor 4 , image combiner 8 and final output image 9 . Each sub-aperture channel in the multi-channel processor 4 includes an optical receiving unit 5 , a photodetector 6 and an image processor 7 . The example figure includes four sub-aperture channels. Four identical sub-apertures are opened above the aperture stop 2, the aperture stop 2 is positione...
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The invention relates to a multi-subaperture optical receiving antenna system of a synthetic aperture laser imaging radar. An optical antenna aperture is decomposed into a plurality of subapertures having the same shape and the same size; a plurality of corresponding photoelectric detectors and a processor are used for receiving and image processing of a multi-subaperture channel; and an image ofthe multi-subaperture channel is finally output through a digital recombiner in a non-coherence stacking way. The multi-subaperture optical receiving antenna system has the advantage of a large-aperture optical antenna for receiving higher echo energy and the characteristic of a larger heterodyne receiving visual field, so the contradiction between the smaller heterodyne receiving visual field ofthe large-aperture optical antenna and lower received energy of the small-aperture optical antenna is solved and the laser speckle effect of a target echo is weakened. The multi-subaperture optical receiving antenna system can be structurally combined with an emission optical antenna easily to form a coaxial optical receiving / emission antenna system of the synthetic aperture laser imaging radar.
Description
technical field [0001] The invention relates to a synthetic aperture laser imaging radar, which is a multi-sub-aperture optical receiving antenna system of a synthetic aperture laser imaging radar. Structurally, an optical antenna aperture is decomposed into a plurality of sub-apertures with the same shape and size, and then corresponding Multi-photodetectors and processors are used for receiving and image processing of multi-sub-aperture channels, and the images of multi-sub-aperture channels are generated by non-coherent superimposition through a digital multiplexer to produce a final imaging output. The present invention can realize the advantages of large-aperture optical antennas in receiving large echo energy, and can also realize the characteristics of large heterodyne receiving field of view in sub-aperture optical antennas, so it can solve the problem of large-aperture optical antenna heterodyne There is a contradiction between the small receiving field of view and th...
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IPC IPC(8): G01S7/481G01S17/89
Inventor 刘立人
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI