A non-coherent accumulation detection method for spaceborne lidar based on projection convolution
A non-coherent accumulation and laser radar technology, which is applied in the direction of measuring devices, electromagnetic wave re-radiation, radio wave measurement systems, etc., can solve the problem that fast moving targets cannot be effectively accumulated, achieve echo energy focusing, and the method is simple and effective. Good real-time effect
Active Publication Date: 2020-04-10
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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[0007] The technical problem of the present invention is: to overcome the deficiencies of the prior art, to provide a spaceborne lidar non-coherent accumulation detection method based on projection convolution, and to solve the problem that the traditional radar target non-coherent accumulation detection method cannot effectively accumulate fast moving targets The problem
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[0030] Definition 1: The distance interval length ∈, which is defined according to the detection index requirements of the system. The smaller ∈ is, the higher the precision of target detection is, but the number of accumulated resolution intervals increases, and the complexity of system operation and processing increases. The value of ∈ should be able to meet the accuracy requirements of the rough positioning of the target, and at the same time, it should minimize the number of accumulated resolution intervals and improve the processing speed.
[0031]
[0032] Among them, In is the adjustment factor, which can be selected according to the actual situation of the radar system, generally selected as
[0033] Definition 2: Single ranging echo distribution function f(m).
[0034] Divide the radar range L into M unit intervals with length ∈,
[0035]
[0036] The single ranging echo distribution function f(m) is defined as follows:
[0037]
[0038] Among them, d is...
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The invention relates to a projection convolution-based satellite-borne laser radar incoherent accumulation detection method. According to the method, the convolution operation mechanism of echo energy projection is introduced into the distance dimension of a satellite-borne laser radar, so that the moving target detection across multiple distance regions is achieved. The influence of energy accumulation dispersion caused by the migration of a moving target which is moving fast in the space within a plurality of distance intervals can be eliminated. The non-coherent accumulation detection capability of a weak and fast moving target is improved. The problem that the effective accumulation of a fast moving target cannot be realized based on a traditional radar target non-coherent accumulation detection method in the prior art can be solved. The method is particularly suitable for hardware implementation of digital circuits such as an FPGA (field programmable gate array) and the like.
Description
technical field [0001] The invention relates to a non-coherent accumulation detection method for spaceborne lidar based on projection convolution, and belongs to the technical field of radar weak target detection. Background technique [0002] Spaceborne lidar has the advantages of small size, light weight, high ranging resolution and strong anti-electromagnetic interference ability, and is one of the main development directions of satellite ranging payloads in the future. However, due to the limited resources of the satellite platform and the energy conversion efficiency of the laser, the transmission power and repetition frequency of the spaceborne lidar are greatly limited. In order to improve the ranging power of the radar, it is necessary to improve the target detection capability of the radar. [0003] The classic analog laser radar uses the threshold method for single pulse detection, which can only work under the condition of large signal-to-noise ratio, which greatl...
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IPC IPC(8): G01S17/50G01S17/66G01S7/48
CPCG01S7/4802G01S17/50G01S17/66
Inventor 郑伟武学英崔健永赵文峰宋博雷文平郑永超
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH