DOA estimation of coherent NLFM signals based on DPT and virtual array

doi:10.3724/SP.J.1087.2011.02329

Journal of Computer Applications ›› 2011, Vol. 31 ›› Issue (09): 2329-2332.DOI: 10.3724/SP.J.1087.2011.02329

• Network and communications • Previous Articles Next Articles

DOA estimation of coherent NLFM signals based on DPT and virtual array

GAO Chun-xia¹,²,ZHANG Tian-qi¹,²,WEI Shi-peng¹,²,TAN Fang-qing¹,²

1. Key Laboratory of Signal and Information Processing of Chongqing, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
2. School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Received:2011-03-28 Revised:2011-05-19 Online:2011-09-01 Published:2011-09-01
Contact: GAO Chun-xia

DPT和虚拟阵列相结合的相干NLFM信号的DOA估计

高春霞¹,²,张天骐¹,²,魏世朋¹,²,谭方青¹,²

1. 重庆邮电大学通信与信息工程学院，重庆 400065
2. 重庆邮电大学信号与信息处理重庆市市级重点实验室，重庆 400065

通讯作者: 高春霞
作者简介:高春霞(1987-),女，河南周口人，硕士研究生，主要研究方向：宽带信号的波达方向估计、阵列信号处理；
张天骐(1971-),男，四川眉山人，教授，博士，主要研究方向：宽带微弱无线电信号处理、盲信号与信息处理、通信对抗；
魏世朋(1987-),男，河南洛阳人，硕士研究生，主要研究方向：微弱信号检测与估计；
谭方青(1987-),男，湖南祁阳人，硕士研究生，主要研究方向：多速率数字信号处理、滤波器组优化设计。
基金资助:
国家自然科学基金资助项目(30970780);国家自然科学基金—中国工程物理研究院NSAF联合基金资助项目(10776040);教育部新世纪优秀人才支持计划项目(NCET-10-0927);信号与信息处理重庆市市级重点实验室建设项目(CSTC 2009CA2003);重庆市自然科学基金资助项目(CSTC 2009BB2287；CSTC 2010BB2398；CSTC 2010BB2411)

Abstract

Abstract: Concerning the common multi-path transmission and reflection factors in the radio communications, broadband coherent sources must be considered. A new algorithm for the Direction Of Arrival (DOA) estimation of correlation wideband Non-Linear Frequency Modulation (NLFM) signals based on Discrete Polynomial-phase Transform (DPT) and virtual array was introduced. And comparison, analysis and improvement were done on the new algorithm. It can settle the problem of not finding coherent signals in routine MUSIC and ESPRIT algorithm. This approach can more accurately estimate and does not decrease effective array aperture, and it also can improve the utilization of array. Then the angle estimation algorithm of two closely-spaced emitters was proposed. The simulation results verify the correctness and efficiency of the new algorithm.

Key words: Discrete Polynomial PhaseTransform, Virtual array transformation, correlation wideband NLFM, Direction of arrival estimation.

摘要： 针对无线电通信领域中经常遇到多径传输和反射因素的现象，必须考虑宽带相干信号源的存在。提出一种离散多项式相位变换(DPT)与虚拟阵列变换法相结合的相干非线性调频(NLFM)信号的波达方向(DOA)估计方法，并对其中的算法做了对比、分析和改进。解决了常规MUSIC、ESPRIT算法不能估计宽带信号、相干信号的问题，不仅能更准确地进行DOA估计，而且不损失阵列的孔径，提高了阵元数的利用率。同时还提出了当两个信号源很近的情况下的角度估计算法。仿真实验证明了该算法的有效性。

关键词: 离散多项式变换, 虚拟阵列变换, 相干NLFM信号, DOA估计

CLC Number:

TN911.7

GAO Chun-xia ZHANG Tian-qi WEI Shi-peng TAN Fang-qing. DOA estimation of coherent NLFM signals based on DPT and virtual array[J]. Journal of Computer Applications, 2011, 31(09): 2329-2332.

高春霞张天骐魏世朋谭方青. DPT和虚拟阵列相结合的相干NLFM信号的DOA估计[J]. 计算机应用, 2011, 31(09): 2329-2332.

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DOA estimation of coherent NLFM signals based on DPT and virtual array

DPT和虚拟阵列相结合的相干NLFM信号的DOA估计

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