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Research on Angle Superresolution on Multi-frequency Signals in HF Radar

Author: LiuZhenZhen
Tutor: YangQiang
School: Harbin Institute of Technology
Course: Electronics and Communication Engineering
Keywords: multi-frequency signals music algorithm focusing process virtual array synthesis
CLC: TN957.51
Type: Master's thesis
Year: 2012
Downloads: 5
Quote: 0
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Abstract


Multi-carrier-frequency(MCF) signa ls is a type of MIMO radar signals,transmitting terminal radiates orthogonal frequency diversity signals, receivingterminal separates each frequency signals through matched filters. MCF signals canmake full use of HF radar dispersive clean band, compared with traditionalphased-array radar, and it is characteristic of the aperture extension of the array, lowsensitivity to RCS of target, and high resolution. This paper focuses on the study ofthe processing method of MCF signals in order to improve the angle resolution.First of all, this paper expands single-frequency signals model and MUSICalgorithm to MCF signals, analyzes the properties of MCF signals’ angle estimationthrough comparing the MUSIC spectrum of the two kinds of signals. Then,elaborate the effect of CSM method on resolution of MCF signals. Results ofsimulation show that direct calculated MUSIC algorithm of MCF signals has higherresolution, smaller impact by SNR while the algorithm after CSM processing haslower sidelobe. CSM processing is equiva lent to increasing exponentially snapshots.Second part, method of virtual array synthesize is presented for the problem ofthe existence of grating lobes in MCF signa l beamforming. When transmittingfrequency is higher than fundamental frequency, sampling of space is sparse,grating lobes appears in beamforming. In this paper we resets virtual array elementbased on real element spacing, and reserves virtual aperture extention to reduce thegrating lobes by virtual array synthesis. In processing progress, cubic splineinterpolation and preconditioned conjugate gradient algorithm are employed tohomogenize the non-uniform sampled data. Simulation results show that the methodof virtual array synthesis can efficiently reduce grating lobes while narrowing themainlobe, and preconditioned conjugate gradient algorithm can filter out the noisewith high stability and low sensitivity to SNR fluctuation.Finally, analyze different frequency selection problem and the situation of eachsignal having a different amplitude of multi-frequency signal. Give the curve of thebeam main lobe width and sidelobe level with the change of different frequencies asa reference for frequency selection. When each frequency has a different amplitude,employ the APES method to calculate the frequency range spatial spectrum, thesignal is normalized.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar > Radar equipment,radar > Radar receiving equipment > Radar signal detection and processing
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