A 2-Dimensional Correlation Interferometer Algorithm Based on Dimension Separation
A 2-dimensional correlation interferometer algorithm based on dimension separation is proposed and can be widely applicable to arbitrary geometry arrays. The approach simplifies the original 2-dimensional angle searching by dividing it into two 1-dimensio
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A 2-Dimensional Correlation Interferometer Algorithm Based on Dimension Separation Xin Zhang, Ting Cheng, and Zishu He
Abstract A 2-dimensional correlation interferometer algorithm based on dimension separation is proposed and can be widely applicable to arbitrary geometry arrays. The approach simplifies the original 2-dimensional angle searching by dividing it into two 1-dimensional searching corresponding to azimuth angle and elevation angle, thus reduces the computational complexity. Meanwhile it ensures the direction finding precision of correlation interferometer. Simulation results indicate the effectiveness of the method, which highly improves the speed of the broadband direction finding system. Keywords Dimension separation • Correlation interferometer • 2-dimensional direction finding
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Introduction
The information contained in the phase of the signal received by the elements of an array is commonly used to determine the incoming angles of an incident wave [1]. Such a configuration is usually called direction finding system known as the interferometer. In the existing direction finding systems, interferometer has the advantages of high direction finding precision, simple algorithm and high speed, and is widely applied in military and civil fields. In military field, it not only can be applied to tracking and locating targets [2] for radar signal processing [3], but also plays an important role in carrying out pertinent electronic jamming and military
Project supported by the National Natural Science Foundation of China (Grant No.61101171) X. Zhang (*) School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, People’s Republic of China e-mail: [email protected] Q. Liang et al. (eds.), Communications, Signal Processing, and Systems, Lecture Notes in Electrical Engineering 202, DOI 10.1007/978-1-4614-5803-6_50, # Springer Science+Business Media New York 2012
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attack. And in civil field, it can be applied in traffic control, life rescue, management of radio spectrum etc. Phase interferometer calculates the direction-of-arrival signal with measured space phase differences between receiving elements [4]. Correlation interferometer is a direction finding system that utilizes the information residing in the measured phase vector consisting of phase differences between various elements of array and then compare it with the assumed phase vectors in sample database [5]. The issues such as ambiguities and the mutual coupling [6] between antennas are reduced to a lower level by virtue of the correlation computation process. However, phase difference vectors in sample database are different according to variable signal frequency, azimuth angle and elevation angle [7], which lead to large computational complexity of correlation calculation that may not satisfy the requirement of real-time broadband direction finding system [8]. To solve the problem mentioned above, this chapter proposes a 2-dimensional correlation interferom
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