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Research and Realization of Correlation Interferometer Fast Direction Finding Algorithm

Author: HanGuang
Tutor: WangBin
School: PLA Information Engineering University
Course: Military Communication
Keywords: Finding Phase interferometer Phase ambiguity Related interferometer Correlation coefficient FPGA Achieve
CLC: TH744.3
Type: Master's thesis
Year: 2010
Downloads: 122
Quote: 1
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Abstract


Interferometer algorithm as a fast finding algorithm, the algorithm is simple, high sensitivity, which is widely used in a variety of finding system. Interference Measuring algorithm can be divided into phase interferometer algorithm two algorithms and interferometer. Phase interferometer because of its simple, finding speed, most shortwave band direction finding equipment, but the algorithm is sensitive antenna amplitude and phase errors, poor immunity. Interferometer direction finding algorithm has the ability of anti-amplitude and phase errors antenna formation limit less, etc., will be applied to the short-wave band direction finding system can overcome the problems of phase interferometer, but Interferometer The algorithm computation great only using DSP difficult to achieve real-time processing. To solve this problem, in a project to be adopted FPGA and DSP combined operation mode, according to project requirements, verification platform to achieve a frequency domain interferometer algorithm to complete the assessment of the validation of the algorithm and system resources for the conduct of the project laid the foundation. The article reads as follows: the research phase interferometer and its solution fuzzy algorithm. First, the length of the baseline method, the virtual baseline method and three-dimensional baseline three commonly used defuzzification algorithm is studied. Then, for the length of the baseline method, the virtual the baseline method formation is limited and three-dimensional baseline method noise immunity is not strong, given a fuzzy algorithm based on the multiple correlation computing solution. The simulation results show that the algorithm is suitable for a variety of antenna array, and the anti-noise performance is better than the three-dimensional baseline method. 2, related interferometer algorithm. First of all, the basic principles of time domain and frequency domain two common interferometer algorithm. Then, for interferometer algorithm using FPGA need to consume a large number of chip resources, gives an improved algorithm - minimum spacing, and to assess the the traditional interferometer algorithm with minimum spacing occupied FPGA resources, compare each of the two algorithms processing time, the results show that the minimum spacing in the use of resources and processing time have improved. 3 related interferometer to achieve algorithm design verification platform. First, the short-wave band direction finding system, and one of the processing structure of the interferometer design. Second, related interferometer implementation steps of the algorithm, the combination of FPGA and DSP implementation mode analysis, the division of tasks completed in the two chips. Then details the role of various functional modules within the FPGA, and Intro of each functional module design process. Finally, a system of indicators, and finding performance was tested, the test results show that the text verification system can be realized on the hop rate is lower than 100Hops / s bandwidth of less than 500kHz real-time measurement of the the shortwave frequency hopping signal to.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Optical instruments > Physical optical instruments > Interferometer
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