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Distance profile sticking method tolerant to Doppler effect

A technology of Doppler effect and distance imaging, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc., can solve the problems of target splitting, target recognition and detection effects, and achieve the effect of removing redundancy.

Inactive Publication Date: 2018-09-07
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

Therefore, when there is a speed estimation error in the motion compensation speed and the echo signal is still affected by the Doppler effect, the existing range image stitching algorithm is prone to "target splitting" and peak drop, etc. make an impact

Method used

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  • Distance profile sticking method tolerant to Doppler effect
  • Distance profile sticking method tolerant to Doppler effect
  • Distance profile sticking method tolerant to Doppler effect

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Embodiment

[0028] In this example, the parameters used are:

[0029] The sub-pulse width of the FM step signal is T=1us, the bandwidth is B=50MHz, and the sampling frequency is f s =60MHz, the number of pulses is N=32, the fixed frequency step is △f=40MHz, the speed of light c=3e8, r s = 2.5m, r τ =3.75m, Δr=0.1172m. The target distance is R 0 = 1000.5m = 400.2r s , R 1 = 1001.5m = 400.6r s , R 3 =1002m=400.8r s . Sampling and IFFT processing are performed on N target echoes. It can be seen that the target echo energy is mainly distributed on the 400th and 401st sampling points, and most of them are concentrated on the 401st sampling point. Since the processing method for each group of IFFT results is the same, only the processing of the 400th and 401st group of IFFT results will be described in detail below:

[0030] a will be an r s Divided into 10 small segments, the length of each segment is 0.1r s . When the center of the envelope is between two sampling points, Amp(i) ...

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Abstract

The invention belongs to the technical field of radar imaging, and particularly relates to a distance profile sticking method tolerant to the Doppler effect. The invention provides the novel distanceprofile sticking method. Against the problem that echo peaks are not necessarily capable of being collected at sampling points, a reasonable coefficient is used for weighted addition processing, whichgreatly improves the signal to noise ratio. In addition, according to the distribution of target echo energy, distance information with larger amplitude is found to perform distance profile sticking.Not only does the distance profile peak increase, but also data of a spliced sequence has energy continuity. Even if after motion compensation, the echo is still affected by Doppler due to a speed estimation error and the like. The distance profile sticking method tolerant to the Doppler effect has the advantages that the method not only can be used to extract complete effective information and remove redundancy, but also can be used to perform correct sticking on distance profiles under the influence of the Doppler effect caused by motion compensation errors, to obtain a complete panoramic high-resolution one-dimensional distance profile.

Description

technical field [0001] The invention belongs to the technical field of radar imaging, in particular to a range image mosaic method with tolerance to Doppler effect. Background technique [0002] Radar systems synthesize high-resolution one-dimensional range images through IFFT processing, which often introduces range mismatch redundancy and oversampling redundancy. The range mismatch redundancy causes the target to walk in range, resulting in a decrease in ranging accuracy. Oversampling redundancy makes target information appear in multiple sets of IFFT refinement results at the same time, forming false targets and increasing the difficulty of target recognition. If multiple groups of IFFT refinement results are simply connected directly, it is difficult to realize the detection and tracking of the target. There are a variety of distance image information extraction algorithms, such as the discarding method, the method of taking the same distance, etc. to extract effective...

Claims

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Application Information

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IPC IPC(8): G01S13/89
CPCG01S13/89
Inventor 宗竹林鄢思仪
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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