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| Direction Finding Method for Two-dimension Interferometer Using the Time Varying Long Baseline |
| Zhang Min① Guo Fu-cheng① Zhou Yi-yu① Yao Shan-feng② |
①(College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China)
②(National Defense Key Laboratory on Blind Signal Processing, Chengdu 610041, China) |
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Abstract Due to the issues in multichannel interferometer direction finding, such as system complexity and demanding geometry configuration requirement for ambiguity resolving, a Pseudo-linear Least Square (PLS) algorithm is proposed for virtual Two-Dimension (2D) interferometer using the time varying long baseline. It first obtains a set of initial values using a pair of measured phase differences, then applies PLS to each initial angle and finally picks out the estimate with the minimum cost function as the ultimate result. The equivalent relationship between Cramer-Rao Lower Bound (CRLB) and Mean Square Error (MSE) is also derived. The proposed method has no special requirement for the geometry configuration and no need of phase difference unwrapping. Simulation results show this method achieves moderate computation cost and the estimate precision can approach to the CRLB.
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Received: 22 March 2013
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Corresponding Authors:
Zhang Min
E-mail: zhangmin1984@126.com
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2013, Vol. 35 
