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Method for imaging uniformly accelerated motion rigid group targets based on parameterization

An imaging method and uniform acceleration technology, applied in the field of signal processing, can solve the problems of particle swarm optimization algorithm, such as large amount of calculation, large error, and insufficient precision of motion trajectory estimation, and achieve the effect of accurate motion compensation, less calculation amount and high efficiency

Active Publication Date: 2014-03-19
XIDIAN UNIV
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Problems solved by technology

However, the shortcomings of this method are that the particle swarm optimization method only uses the real envelope information when estimating the polynomial coefficients, resulting in large errors in motion compensation and insufficient accuracy of motion trajectory estimation. When the value is large, the particle swarm optimization algorithm has a large amount of computation

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  • Method for imaging uniformly accelerated motion rigid group targets based on parameterization
  • Method for imaging uniformly accelerated motion rigid group targets based on parameterization
  • Method for imaging uniformly accelerated motion rigid group targets based on parameterization

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Embodiment Construction

[0043] Attached belowfigure 1 , the specific embodiment of the present invention is described in further detail:

[0044] Step 1: Acquire the ISAR echo of the group target, the radar transmits and receives the pulse at the pulse repetition frequency, and obtains the ISAR echo with the distance as the row vector and the azimuth as the column vector.

[0045] Step 2, estimate the ambiguity number of the Doppler center of the ISAR echo and perform ambiguity compensation

[0046] 2a) Perform inverse Fourier transform on the ISAR echo recorded by the radar along the range-frequency dimension to obtain the range-slow time domain echo, and multiply the number of range walking units in the range-slow time domain echo by the range resolution to obtain the distance displacement;

[0047] 2b) Divide the distance displacement by the azimuth slow time to obtain the estimated value of the target's actual speed, divide the estimated value of the target's actual speed by the blind speed to o...

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Abstract

The invention discloses a method for imaging uniformly accelerated motion rigid group targets based on parameterization. The method comprises (1) radar echo recording; (2) estimation and compensation of fuzzy numbers; (3) coarse compensation of secondary phase items; (4) judgement of centers of sub-targets; (5) image segmentation; (6) joint estimation of the phase items; and (7) image synthesis of the group targets. Automatic compensation is performed through a parameterizing method, a sub-target area is estimated by combining the method and a K mean image segmentation algorithm, and fine imaging of the group targets is achieved. By means of the method, the shortcomings of large motion compensation error, poor motion trail estimation accuracy and low operation complexity of a method for imaging the group targets based on envelope trajectory fitting are overcome. In addition, the method has the advantages of being accurate in motion compensation, good in image focus, less in operation quantity and high in efficiency.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and further relates to a parameterization-based imaging method for uniformly accelerated moving rigid body group targets in the field of radar imaging. The invention can effectively image the rigid body group targets in the air, accurately describe the features such as the shape and size of the sub-targets, and provide a strong guarantee for target recognition. Background technique [0002] When high-resolution radar is used to image rigid objects in the air (such as aircraft formations, etc.), multiple targets may be included in the same radar beam width. For the convenience of description, multiple targets flying in formation or having similar motion states in the same radar beam are defined as group targets, and the targets contained in the group targets are defined as sub-targets. When the distance between the sub-targets is small, the corresponding echoes overlap in the range-slow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/89G01S7/41
Inventor 白雪茹周峰刘妍保铮
Owner XIDIAN UNIV
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