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一种适用于低信噪比的LFM信号调频率估计新算法

A New Algorithm of Frequency Modulated Rate Estimation for Low SNR LFM Signal
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摘要 离散多项式相位变换(DPT)算法广泛应用于线性调频信号调频率参数的实时估计,但其缺点是不适用于低信噪比环境,针对这个问题,提出一种基于频率走动校正的积分离散多项式相位变换算法。该算法通过时频轨迹积分提高信号的能量,克服了DPT算法低信噪比下性能较差的缺点,同时,算法采用频率走动校正替代二维搜索,避免了计算量的快速增加。理论分析及仿真结果均验证了算法的有效性。 Discrete polynomial phase transform (DPT) algorithm is widely used in real-time pa- rameter estimation of frequency modulated rate for linear FM signal, but it is not proper in low SNR environment. To solve this problem, a frequency walking correction is proposed based on integration discrete polynomial phase algorithm. Integration is used in frequency-time domain to increase energy, so as to improve the poor performance in low SNR environment. At the same time, frequency walking correction is used in place of the two-dimensional search, which avoids a rapid increase in amount of computation. Theoretical analysis and simulation results confirm the validity of the algorithm.
出处 《电子信息对抗技术》 2014年第2期1-5,共5页 Electronic Information Warfare Technology
关键词 DPT算法 频率走动校正 KEYSTONE变换 DPT algorithm frequency walk correction Keystone transform
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