| 一种低信噪比下LFM信号参数快速估计算法 |
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| 引用本文： | 韩孟飞,王永庆,吴嗣亮,崔嵬.一种低信噪比下LFM信号参数快速估计算法[J].北京理工大学学报,2009,29(2):147-151. |
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| 作者姓名： | 韩孟飞 王永庆 吴嗣亮 崔嵬 |
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| 作者单位： | 北京理工大学,雷达技术研究所,北京,100081;北京理工大学,雷达技术研究所,北京,100081;北京理工大学,雷达技术研究所,北京,100081;北京理工大学,雷达技术研究所,北京,100081 |
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| 摘 要： | 为了对线性调频(LFM)信号参数进行快速、准确的估计,提出了一种新算法.该算法根据LFM信号当能量一定时在相同时宽范围内频谱幅度平方与调频斜率成反比的特点,通过对若干组快速傅里叶变换(FFT)结果进行模值选大,同时给出了起始频率和调频斜率的估计.仿真结果表明,通过合理设置算法参数,算法可以用于信噪比低至-38dB的LFM信号的参数估计.
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| 关 键 词： | LFM信号参数估计 低信噪比 FFT运算 信噪比损失 |
| 收稿时间： | 2008/5/15 0:00:00 |
A Fast Algorithm on Parameter Estimation of LFM Signals Under Low SNR |
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| HAN Meng-fei,WANG Yong-qing,WU Si-liang and CUI Wei.A Fast Algorithm on Parameter Estimation of LFM Signals Under Low SNR[J].Journal of Beijing Institute of Technology(Natural Science Edition),2009,29(2):147-151. |
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| Authors: | HAN Meng-fei WANG Yong-qing WU Si-liang and CUI Wei |
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| Institution: | Radar Research Lab;Beijing Institute of Technology;Beijing 100081;China |
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| Abstract: | To attain fast and accurate estimation under low signal and noise ratio(SNR) conditions,a novel algorithm is presented.On the basis that when linear frequency modulation(LFM) signals possess the same energy and duration,their squares of spectrum amplitude are inversely proportional to their respective frequency rates,the algorithm can give estimations of initial frequency and frequency rate together only by means of searching the maximum among several groups of fast Fourier transform(FFT) maximum amplitudes... |
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| Keywords: | parameter estimation of LFM signals low signal and noise ratio FFT comput-ation signal and noise ratio loss |
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