基于扩展孔径ESPRIT算法的高精度无模糊二维DOA估计

doi:10.3969/j.issn.1000-1093.2012.01.017

兵工学报 ›› 2012, Vol. 33 ›› Issue (1): 103-108.doi: 10.3969/j.issn.1000-1093.2012.01.017

基于扩展孔径ESPRIT算法的高精度无模糊二维DOA估计

顾陈, 何劲, 李洪涛, 朱晓华

(南京理工大学电子工程系，江苏南京 210094)

收稿日期:2010-05-31 修回日期:2010-05-31 上线日期:2014-03-04
作者简介:顾陈（1980—），女，博士
基金资助:
南京理工大学自主科研专项计划资助项目(2010ZYTS028)

High Accurate and Unambiguous 2D Direction Finding Estimation Based on Extended Aperture ESPRIT Algorithm

GU Chen, HE Jin, LI Hong-tao, ZHU Xiao-hua

(School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China)

Received:2010-05-31 Revised:2010-05-31 Online:2014-03-04

摘要/Abstract

摘要： 针对扩展阵列孔径会产生估计模糊的问题，本文提出一种基于双平行阵扩展孔径ESPRIT算法。算法首先设置双平行阵传感器之间距离远大于半波长以获得阵列扩展孔径；然后将传感器按照平行于x轴与平行于y轴分为2个子阵；对平行于x轴的子阵采用ESPRIT法，计算出低精度但不模糊的y轴方向余弦估计和高精度但模糊的x轴方向余弦估计，同样由平行于y轴的子阵算出低精度但不模糊的x轴方向余弦估计和高精度但模糊的y轴方向余弦估计；最后将低精度但不模糊的方向余弦估计作为参考值来解由于扩展孔径带来的模糊问题，并得到最终的波达方向估计值。本文提出的算法无需二维搜索，是一种低运算量高精度的算法。此外本文还针对特征值相等时的角度配对失效现象，提出一种基于子空间正交的新配对方法。计算机仿真实验验证了本文算法的性能。

关键词: 雷达工程, 阵列信号处理, ESPRIT, 扩展孔径, 解模糊

Abstract: A new high accurate azimuth and elevation angle estimation algorithm using ESPRIT algorithm is developed to avoid the ambiguous of extended aperture. Firstly the two-parallel-shape array geometry, which consists of sensors spaced much farther apart than a half-wavelength, is exploited to achieve array aperture extension, and the sensors are divided into 2 sub-arrays. The sub-array parallel with the x-axis is employed to extract low accurate but unambiguous y-axis direction cosines and high accurate but cyclically ambiguous x-axis direction cosines. Then, the sub-array parallel with the y-axis is employed to extract unambiguous x-axis direction cosines and cyclically ambiguous y-axis direction cosines. Finally, the low accurate unambiguous direction cosine estimates are used to resolve the cyclically ambiguous direction cosine estimates to obtain azimuth-elevation angle estimates. The proposed algorithm requires no 2D iterative searching, and thereby, offering high estimation precision with low computational complexity. Furthermore, a new pairing method based on the orthometric subspaces is proposed for the equivalent eigenvalues case. The simulation results indicate the performance of proposed algorithms.

Key words: radar engineering, array signal processing, ESPRIT, aperture extension, disambiguated

中图分类号:

TN951

顾陈, 何劲, 李洪涛, 朱晓华. 基于扩展孔径ESPRIT算法的高精度无模糊二维DOA估计[J]. 兵工学报, 2012, 33(1): 103-108.

GU Chen, HE Jin, LI Hong-tao, ZHU Xiao-hua. High Accurate and Unambiguous 2D Direction Finding Estimation Based on Extended Aperture ESPRIT Algorithm[J]. Acta Armamentarii, 2012, 33(1): 103-108.

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基于扩展孔径ESPRIT算法的高精度无模糊二维DOA估计

High Accurate and Unambiguous 2D Direction Finding Estimation Based on Extended Aperture ESPRIT Algorithm

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