海雜波背景下機(jī)載雷達(dá)目標(biāo)檢測與性能評估
[Abstract]:The marine land area of our country is vast and the environment is complex. It is a very important way to use airborne radar to carry on reconnaissance and surveillance to our country's marine land. When the airborne radar works in the marine environment, receiving most of the backscattering echoes is unwanted. It is very important to study the characteristics of sea clutter and the method of target detection in the background of sea clutter for the economic and national defense construction of our country. Aiming at the problem of SNR loss of the target falling on the main lobe edge, an adaptive joint detection method of double pointing and differential beam is proposed, which can effectively compensate the edge gain loss of the receiving beam and realize the target angle estimation. In the research of sea clutter characteristics, aiming at the difficult problem of theoretical analysis of clutter characteristics after signal processing, this paper presents the analysis of clutter characteristics before and after signal processing based on the spherical invariant stochastic process (spherically invariant random processes SIRP method. The relationship of clutter characteristics before and after signal processing is obtained. The main work of this paper is as follows: 1. The model of airborne radar sea clutter signal and the basic space-time adaptive signal processing technology are analyzed. Then the conventional adaptive and beam detection methods and the conventional adaptive and differential beam combined detection methods are analyzed respectively. A new method of target joint detection based on adaptive double pointing and differential beam is proposed. Finally, the detection performance of these three methods is compared and analyzed by simulation experiments. Several commonly used models for statistical distribution of sea clutter are analyzed, and several common methods for estimating model parameters are analyzed. Then, two equivalent models, Gamma distribution and Gao Si distribution, are studied based on K distribution model. The accuracy of the two equivalent models is compared. Finally, according to the characteristic that K distribution can be equivalent to Gamma distribution in a certain range, a fast estimation method of K distribution. In this paper, a simulation model of K-distributed space-time two-dimensional sea clutter data based on SIRP is analyzed. Based on this model, the characteristics of K-distributed sea clutter before and after signal processing are simulated and analyzed. Finally, the calculation method of blind area map under 2 / 4 criterion is analyzed, and the blind area map of Rayleigh distributed sea clutter data processed by FA (factored approach) after 2 / 4 detection criterion is obtained by simulation experiment.
【學(xué)位授予單位】:西安電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TN957.51
【共引文獻(xiàn)】
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