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A Genetic Algorithm-Based Method for Optimizing the Array Element Position of Mimo-SAR Area Array Antenna

A technology of MIMO-SAR and genetic algorithm, which is applied in the field of multi-input multi-output synthetic aperture radar imaging and radar, and can solve the problems of genetic algorithm population monotony, premature convergence, optimization problems that cannot reach the optimal solution, etc.

Active Publication Date: 2018-06-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

By changing the positions of the antenna transmitting and receiving elements in the array, suppressing the side lobe level of the equivalent transmitting and receiving antenna pattern and reducing the width of the main lobe as much as possible, the purpose of optimizing the array is achieved; in the selection of the optimization method, the genetic algorithm It is very suitable for nonlinear optimization problems, so a lot of research has been done to solve the optimization problem of sparse one-dimensional linear arrays. However, the genetic algorithm may produce population monotony and premature convergence, making the optimization problem unable to reach the optimum. untie

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  • A Genetic Algorithm-Based Method for Optimizing the Array Element Position of Mimo-SAR Area Array Antenna
  • A Genetic Algorithm-Based Method for Optimizing the Array Element Position of Mimo-SAR Area Array Antenna
  • A Genetic Algorithm-Based Method for Optimizing the Array Element Position of Mimo-SAR Area Array Antenna

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Embodiment Construction

[0081] The present invention mainly adopts the method of simulation experiment for verification, and all steps and conclusions are verified correctly on MATLAB2013a. The specific implementation steps are as follows:

[0082] Step 1. MIMO-SAR area array parameter initialization:

[0083] Initialize the MIMO-SAR area array parameters include: the carrier wavelength λ=0.03m of the radar transmitting signal; the propagation speed of the electromagnetic wave in the air, denoted as C=3×10 8 Hz; the minimum interval between array elements, dc=0.015m; the number of transmitting array elements, TN=30; the number of receiving array elements, RN=30; the total number of array elements, SN=60; the pitch angle of the target scattering point, θ 0 = 45 degrees; the azimuth angle of the target scattering point, According to the multiple-input multiple-output synthetic aperture radar imaging system scheme, the initialization parameters of the MIMO-SAR array are all known.

[0084] Step 2. G...

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Abstract

The present invention provides a method for optimizing the position of MIMO‑SAR area array antenna elements based on genetic algorithm, which establishes an optimization model of array pattern based on the antenna phase center approximation principle, and uses the minimum peak side lobe ratio and minimum main The lobe width is the optimization target. During the coding process of the genetic algorithm, the position of the array element is selected on the grid point; and two transmitting array elements and two receiving array elements are arranged at the four ends of the array area to ensure that the array The maximum length of the array element; the prematurity of the genetic algorithm is suppressed, and the optimal array element position is obtained; the planar array form with the minimum spacing constraint of the array elements is adopted, and the number of array elements required is greatly reduced, thereby effectively reducing the cost and cost of the antenna system. The amount of calculation is more suitable for the needs of engineering design, and it provides convenience for MIMO-SAR 3D imaging and target detection and recognition.

Description

Technical field: [0001] The invention belongs to the technical field of radar, and in particular relates to the technical field of multiple-input multiple-output synthetic aperture radar (MIMO-SAR) imaging. Background technique: [0002] With the in-depth research on MIMO (multi-input multi-output) radar, people put forward the concept of MIMO-SAR, that is, "put the coherent MIMO radar on the motion The reference image is defined as MIMO-SAR". It transmits multiple uncorrelated waveforms independently at the same time through multiple antennas at the transmitting end, and multiple antennas at the receiving end independently receive scene echoes at the same time, which can equivalently generate more observation channels, thereby reducing the number of actual antenna elements. The application of MIMO radar technology to SAR system provides a new way for high-resolution imaging to solve the contradiction between high-resolution and wide swath of conventional SAR, so it has bee...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G01S13/90
Inventor 张晓玲余鹏范小天郭立文
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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