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Array error on DOA estimation and correction

Author: ZhaoXueWei
Tutor: GongYaoZuo
School: University of Electronic Science and Technology
Course: Signal and Information Processing
Keywords: OTH radar (OTHR) Spatial spectrum estimation Array error Error correction
CLC: TN911.7
Type: Master's thesis
Year: 2008
Downloads: 272
Quote: 5
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Abstract


The space spectrum (DOA) estimation is an important research direction in the array signal processing, in many areas such as radar, communication, sonar extremely broad application prospects. Spatial spectrum estimation focused on the research space sensor array constituted by a processing system to the accurate estimation of the ability of the various parameters of the signal in space of interest, its main purpose is a parameter, or the position of the source of the estimated signal airspace, which is also the radar one of the important tasks, communication, sonar, and many other fields. This article is a subject of the research group Institute estimated in the over-the-horizon radar DOA cooperation projects. The OTHR general adaptive beamforming methods processing array (ADBF) signal. But in the process of the ADBF on the direction of arrival of the target echo signal and an interference signal must be estimated. Therefore, the signal direction of arrival (DOA) estimation methods play a crucial role in the over-the-horizon radar. But the error signal direction of arrival (DOA) estimates have a big impact on DOA estimation errors and fail, and therefore must be corrected error signal DOA improve target detection capability, to give full play to OTHR performance advantages. This paper studies the array error OTHR DOA estimation method and its correction. First, given the basic framework of the OTH radar signal processing and the azimuth signal extraction principle and source assumptions. OTHR for orientation detection DOA estimates as well as some of the relevant theoretical approaches, analysis and comparison, and gives the computer simulation, by comparing decided for error on multiple signal classification (MUSIC) law research and analysis. MUSIC algorithm array position error, channel error (gain and phase errors) preliminary research and analysis, and Expand MUSIC algorithm sensitivity formula is derived from the first-order Taylor formula MUSIC Spatial Spectrum exported sensitivity formula, to discuss the impact of different MUSIC Spatial Spectrum array of channel errors in different circumstances, and computer simulation analysis. Finally, the two types of error correction. Wherein based on the the subspace principle and the steepest descent method in the array position error correction method by means of the three directions from the far field need not be precisely known calibration signal to the error correction. The use of array covariance matrix Toeplitz array element channel error correction method to reduce the impact of the error. Simulation results verify the effectiveness of the two correction methods.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication theory > Signal processing
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