Systems Engineering and Electronics ›› 2018, Vol. 40 ›› Issue (5): 989-996.doi: 10.3969/j.issn.1001-506X.2018.05.05

Previous Articles     Next Articles

2D-DOA estimation on conical conformal array antennas for non-circular signals

ZHANG Ling1,3, GUO Ying1, ZOU Feng2, QI Zisen1   

  1. 1. School of Information and Navigation, Air Force Engineering University, Xi’an 710077, China; 2. The Office of Military Representatives Stationing in the XAC, Xi’an 710089, China; 3. Unit 94826 of the PLA, Shanghai 200433, China
  • Online:2018-04-28 Published:2018-04-24

PDF (PC)

Abstract:

In view of the single curvature surface of the conical carrier, combining with rationally-placed sensor elements and non-circular signal’s character that its oval covariance matrix is not equal to zero, the method of blind two dimensional-direction of arrival (2D-DOA) estimation on non-circular signals with conical conformal array antennas with respect to polarization diversity is proposed. The parameters of polarization diversity and DOA are decoupled by the method which is based on the idea of non-circular estimation of signal parameters via rotation invariant technique (NC-ESPRIT), thoroughly taking advantage of array augmentation of non-circular signals. On this basis, 2D-DOA is realized without knowing the polarization diversity of antennas by separable dimension processing of azimuth and pitch angles. In view of coherent signals, conical conformal array for noncircular signal de-correlation spatial smoothing algorithm is deduced. Applicability for coherent signals is ensured and the application range of the algorithm is extended by preprocessing of de-correlation. The computer simulation demonstrates that the proposed algorithm promotes the accuracy of DOA estimation greatly compared to the existed algorithm at low signal-to-noise ratio (lower than 10 dB) and has better effectiveness.

[an error occurred while processing this directive]