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Based on high-resolution direction finding passive radar technology research

Author: DongMing
Tutor: SiWeiJian
School: Harbin Engineering University
Course: Communication and Information System
Keywords: Passive direction finding techniques Spatial spectrum estimation Low SNR Small number of snapshots High resolution Modified MUSIC Algorithm
CLC: TN957.51
Type: Master's thesis
Year: 2011
Downloads: 76
Quote: 0
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Abstract


Spatial spectrum estimation techniques with high precision angle measurement, angle resolution and strong, without Rayleigh limit restrictions, etc.. In the maritime, aviation, civil, communications, electronic warfare radar, acoustic sonar have a wide range of applications. In today's electronic warfare radar field, especially in the aspect of passive testing, finding the old and new systems simultaneously, the electromagnetic environment is becoming increasingly complex and multi-target radar decoy for finding such circumstances, the spatial spectrum estimation technology research has important significance. This topic combines engineering applications in the context of the passive radar system in the direction finding method to study focuses on the multi-target precision, high-resolution direction finding method. Through the existing spatial spectrum estimation algorithm for analysis and improvement, to achieve improved algorithm in terms of accuracy and resolution performance improvement. First, the introduction to the technique of passive testing phase interferometer technology works, a brief analysis of the technology of the phase ambiguity and angle measurement accuracy and other related issues, and established through mathematical derivation incoherent source than under two-phase system interferometer to measure the dynamic mathematical model, simulation results are given in a non-coherent source than under two-phase interferometer to measure the performance of dynamic proved interferometer technology does not have the ability to distinguish between multiple targets. To this end, the introduction of spatial spectrum estimation to technology, and spectral estimation techniques in the classical MUSIC algorithm as the main object of study, the received signal is given antenna array typical mathematical models, including one-dimensional and three-dimensional space linear array model. Then, for classical algorithm MUSIC algorithm and other related problems in research, through a series of theoretical analysis and derivation of the classical MUSIC algorithm reasonable improvement in order to achieve such resolution direction finding accuracy and performance improvement. Next, in different simulation conditions, through different forms of MUSIC algorithm and improved MUSIC algorithm Matlab simulation analysis and comparison of simulation results show that at low SNR, small number of snapshots and other conditions improved MUSIC algorithm has more superior resolution performance. Finally, with the practical application of engineering signal processing hardware finding system for improving MUSIC algorithm software design processes and hardware schematic are described. And in laboratory conditions, the classical MUSIC algorithm and improved MUSIC algorithm for the actual test, through both analysis and comparison of measured data, further evidence Modified MUSIC Algorithm in resolution performance superiority, provides for the practical application of engineering basis, to meet the expected results.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar > Radar equipment,radar > Radar receiving equipment > Radar signal detection and processing
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