海雜波AR譜擴(kuò)展分形特性及微弱目標(biāo)檢測(cè)方法
[Abstract]:In order to overcome the shortcoming of spectrum Fourier analysis, the power spectrum of sea clutter is calculated by using the method of autoregressive spectrum estimation. The autoregressive model is a linear predictive model which estimates the power spectrum by the autocorrelation function matrix of the sequence and has a more accurate spectral resolution. This paper mainly analyzes the extended fractal characteristics of sea clutter power spectrum based on autoregressive spectrum estimation and its application in weak target detection. Firstly, the fractional Brownian motion model is taken as an example to prove that the power spectrum is self-similar. Secondly, based on the measured sea clutter data of X-band radar, the multiscale Hurst exponent and its optimal scale range of sea clutter autoregressive spectrum are analyzed. Finally, a target detection method based on autoregressive multiscale Hurst exponents is proposed. The experimental results show that this detection method has the ability of weak target detection in sea clutter background. Compared with the existing target detection methods based on extended fractal and traditional CFAR detection methods, the proposed algorithm has better detection performance in the case of low signal-to-clutter ratio.
【作者單位】: 西安電子科技大學(xué)雷達(dá)信號(hào)處理國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】:國(guó)家重大科學(xué)儀器設(shè)備開(kāi)發(fā)專項(xiàng)基金資助項(xiàng)目(2013YQ20060705)
【分類號(hào)】:TN957.52
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