本文選題：非線性調(diào)頻信號(hào)　切入點(diǎn)：時(shí)頻分析　出處：《南京大學(xué)學(xué)報(bào)(自然科學(xué))》2017年06期 　論文類型：期刊論文

【摘要】：研究了微動(dòng)目標(biāo)的參數(shù)與其微多普勒特征之間的關(guān)系,針對(duì)旋轉(zhuǎn)目標(biāo)的微多普勒信號(hào)表現(xiàn)為三參數(shù)正弦調(diào)頻信號(hào)的特點(diǎn),提出了一種正弦調(diào)頻信號(hào)參數(shù)快速提取算法.該方法對(duì)目標(biāo)信號(hào)進(jìn)行時(shí)頻分析,并對(duì)分析的結(jié)果進(jìn)行時(shí)頻脊的提取,獲得正弦調(diào)頻信號(hào)的頻率變換曲線.最后在提取的時(shí)頻變換曲線上進(jìn)行正弦曲線的隨機(jī)Hough變換檢測(cè),從而得到正弦調(diào)頻信號(hào)的參數(shù)估計(jì).當(dāng)信噪比較小時(shí),該方法的估計(jì)精度優(yōu)于Time Frequency Distribution-Hough(TFD-Hough)變換方法.當(dāng)信噪比較大時(shí),兩種方法的估計(jì)精度相當(dāng),但該方法的運(yùn)算時(shí)間優(yōu)于TFD-Hough變換方法.仿真實(shí)驗(yàn)結(jié)果表明,相對(duì)于TFD-Hough變換方法,該方法的運(yùn)算量明顯減少,當(dāng)信噪比為0時(shí),該方法的運(yùn)算時(shí)間約為TFD-Hough變換方法的19.9%.在計(jì)算精度方面,該方法的計(jì)算精度與TFD-Hough變換方法相當(dāng).
[Abstract]:The relationship between the parameters of the micro-moving target and its micro-Doppler characteristics is studied. The micro-Doppler signal of the rotating target is characterized by a three-parameter sinusoidal frequency modulation signal. A fast algorithm for extracting the parameters of sinusoidal frequency modulation signal is proposed. The target signal is analyzed by time-frequency analysis, and the time and frequency ridges are extracted from the result of the analysis. The frequency transform curve of sinusoidal FM signal is obtained. Finally, the random Hough transform of sinusoidal signal is detected on the extracted time-frequency transform curve, and the parameter estimation of sinusoidal FM signal is obtained. The estimation accuracy of this method is better than that of Time Frequency Distribution-Hough-TFD-Hough. when the signal-to-noise ratio (SNR) is high, the estimation accuracy of the two methods is the same, but the computation time of the two methods is better than that of TFD-Hough transform. When the SNR is 0:00, the computation time of this method is about 19.9. in terms of calculation accuracy, the accuracy of this method is equivalent to that of TFD-Hough transform method.
【作者單位】： 南京大學(xué)電子科學(xué)與工程學(xué)院;
【基金】：江蘇省基礎(chǔ)研究計(jì)劃(BK20151391)
【分類號(hào)】：TJ761.3;TN957.51

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