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Open AccessArticle

Spatial Signature Estimation with an Uncalibrated Uniform Linear Array

Institute of Artificial Intelligence and Robotics, Xi'an Jiaotong University, Xi'an 710049, China
Department of Electrical and Electronic Engineering, Tokushima University, Tokushima 770-8506, Japan
Author to whom correspondence should be addressed.
This paper is an extended version of our paper published in Sensor Signal Processing for Defence (SSPD 2012), 25–27 September 2012, London.
Academic Editor: Assefa M. Melesse
Sensors 2015, 15(6), 13899-13915;
Received: 13 March 2015 / Accepted: 10 June 2015 / Published: 12 June 2015
(This article belongs to the Section Remote Sensors)
In this paper, the problem of spatial signature estimation using a uniform linear array (ULA) with unknown sensor gain and phase errors is considered. As is well known, the directions-of-arrival (DOAs) can only be determined within an unknown rotational angle in this array model. However, the phase ambiguity has no impact on the identification of the spatial signature. Two auto-calibration methods are presented for spatial signature estimation. In our methods, the rotational DOAs and model error parameters are firstly obtained, and the spatial signature is subsequently calculated. The first method extracts two subarrays from the ULA to construct an estimator, and the elements of the array can be used several times in one subarray. The other fully exploits multiple invariances in the interior of the sensor array, and a multidimensional nonlinear problem is formulated. A Gauss–Newton iterative algorithm is applied for solving it. The first method can provide excellent initial inputs for the second one. The effectiveness of the proposed algorithms is demonstrated by several simulation results. View Full-Text
Keywords: array signal processing; auto-calibration; parameter estimation array signal processing; auto-calibration; parameter estimation
MDPI and ACS Style

Cao, X.; Xin, J.; Nishio, Y.; Zheng, N. Spatial Signature Estimation with an Uncalibrated Uniform Linear Array. Sensors 2015, 15, 13899-13915.

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