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Research on Time-Frequency Interferometer Direction Finding Algorithm

Author: GaoJianMei
Tutor: LiShaoBin
School: Harbin Institute of Technology
Course: Information and Communication Engineering
Keywords: DOA Estimation Phase ambiguity Time-frequency interferometer Chirp signal
CLC: TH744.3
Type: Master's thesis
Year: 2007
Downloads: 242
Quote: 1
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Abstract


In the current signal -intensive, complex electronic warfare environment, the radar signal source in finding that electronic surveillance is a key technology . Given the traditional phase interferometer DF can only achieve a single pulse and frequency measurement equipment needed to complete the finding, does not have a multi-signal resolution and on the ability of LFM signal direction finding , this paper, in narrowband reception conditions , to achieve the single LFM pulse frequency pulses and high-precision time-frequency radar signal -DOA joint estimation interferometer algorithms. This paper first describes the interferometer 's basic theory, introduced the interferometer principle , constitute a finding system , analysis, discussion of the interferometer errors and direction fuzzy problems for the subsequent chapters and the theoretical groundwork. Then, given the research for narrowband IF digital receiver model and system parameter determination . Single-frequency pulse signal from the start of the phase interferometer and cross-spectral correlation phase interferometer method , focusing on cross-spectral analysis of the relevant phase interferometer frequency -DOA joint estimation performance and the ability to distinguish between the two signals , as the next step in this research foundation. Next, study the Wigner-Ville distribution based on mutual time-frequency interferometer method to analyze the performance of the algorithm ; through symmetric multi-baseline setting, defuzzification same time, using multi- baseline output signal of each array element symmetrical cross Wigner-Ville distribution the average length of time-frequency enhancement, has been single-frequency pulse signal and LFM pulse signal precision time and frequency - DOA joint estimation ; addition, for single-frequency pulse signal simulation compared three phase interferometer method , finding performance, and time-frequency interferometer, cross-spectral correlation phase interferometer method to distinguish between the two signals measured ability , and narrow-band signal reception conditions wideband LFM joint time-frequency -DOA estimation performance of the simulation analysis . Experimental results show that the time-frequency signal interferometer method better reflects the characteristics and details of the array element and the processing needed less treatment is relatively simple, suitable for practical engineering .

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