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Optimization method of compressed sensing lasar sparse wiring array based on low coherence

An optimization method and wiring array technology, applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc., to achieve reasonable optimization of sparse line array and improve imaging performance

Inactive Publication Date: 2017-10-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, the RIP calculation of the compressed sensing measurement matrix in the linear array 3D SAR system is a non-deterministic polynomial (NP) problem, so it is difficult to use the RIP of the measurement matrix in the compressed sensing theory as an index to measure the optimization of the LASAR sparse linear array antenna (see References "Li Xiaobo. Research on Measurement Matrix Based on Compressive Sensing. Doctoral Thesis of Beijing Jiaotong University, 2010.")

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  • Optimization method of compressed sensing lasar sparse wiring array based on low coherence
  • Optimization method of compressed sensing lasar sparse wiring array based on low coherence

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Embodiment Construction

[0058] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified correct on MATLABR2012b software. The specific implementation steps are as follows:

[0059] Step 1. Initialize the LASAR system parameters:

[0060] Initialize LASAR system parameters include: radar platform height H = 1000m; radar working center frequency f c =35×10 9 Hz; radar carrier frequency wavelength λ = 0.00857m; signal bandwidth B of radar transmitting baseband signal r =1.5×10 8 Hz; Radar transmit signal pulse width T P =5×10 -6 s; the frequency modulation slope f of the radar transmitted signal dr =3×10 13 Hz / s; radar receiving gate duration T o =6×10 -4 s; the sampling frequency f of the radar receiving system s =3×10 8 Hz; the pulse repetition frequency PRF of the radar transmitting system = 600Hz; the pulse repetition time of the radar system PRI = 1×10 -3 s; the effective aperture length D of the antenna in the azimuth...

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Abstract

The invention discloses a low-coherence based compression sensing LASAR sparse line array optimization method, which uses the coherence characteristics of the measurement matrix in the compressed sensing theory as a reference basis for the compression sensing LASAR sparse line array optimization, and is based on the compression sensing method in the LASAR system. The minimization of the coherence of the perceptual measurement matrix, with the help of the Fourier transform iterative search method, realizes the optimal design of the array element distribution of the compressed sensing LASAR sparse wiring array antenna, which is more reasonable for the sparse linear array optimization and is conducive to improving the compressed sensing LASAR System imaging performance. The method proposed by the invention is also applicable to other technical fields of sparse wiring array antenna optimization based on compressed sensing.

Description

Technical field: [0001] The technical invention belongs to the technical field of radar, and in particular relates to the technical fields of synthetic aperture radar (SAR) imaging technology and array antenna design. Background technique: [0002] Due to its advantages of all-day, all-weather and large-scale scene observation, synthetic aperture radar (SAR) has become an important remote sensing technology for large-area topographic surveying and mapping. greater effect. Linear array SAR (LASAR) is an extension of the target dimension space resolution capability of traditional two-dimensional SAR imaging technology, which can obtain three-dimensional radar imaging of the observed target scene, and can more precisely describe the geometric and scattering characteristics of the target in the observed scene, compared with the traditional two-dimensional SAR imaging technology. Two-dimensional SAR has improved the target feature extraction and target recognition capabilities o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/02G01S13/90
CPCG01S7/02G01S13/90G01S13/9094G01S13/904
Inventor 韦顺军张晓玲余鹏张博军
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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