| 线性调频连续波雷达信号的参数估计 |
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| 引用本文： | 刘勇,张国毅,张旭洲. 线性调频连续波雷达信号的参数估计[J]. 信号处理, 2014, 30(7): 848-855 |
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| 作者姓名： | 刘勇 张国毅 张旭洲 |
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| 作者单位： | 空军航空大学信息对抗系 |
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| 摘 要： | 根据线性调频连续波（LFMCW）信号的周期特点，提出累积Wigner-Hough变换（CWHT）进行LFMCW信号的参数估计。首先分析了自相关函数的特点，通过搜索自相关函数的峰值，实现了信号调制周期的估计。然后根据调制周期将信号分段，进行CWHT。通过CWHT峰值和起始时间的搜索，最终估计出信号的调频斜率与起始频率。理论推导了CWHT的信噪比（SNR）公式，并分析了相关计算。该算法不仅减小了时频交叉项的影响，而且降低了计算的复杂度。同时由于进行了多个周期的非相干累积，提高了该算法的抗噪性能。仿真结果验证了本文算法在低SNR下具有较好的参数估计性能。
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| 关 键 词： | 线性调频连续波 自相关函数 累积Wigner-Hough变换 |
| 收稿时间： | 2013-09-24 |
Parameter Estimation of LFMCW Radar Signal |
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| Affiliation: | Department of Information Countermeasures, Aviation University of Air Force |
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| Abstract: | Cumulative Wigner-Hough Transform (CWHT) is proposed for parameter estimation of Linear Frequency Modulation Continuous Wave (LFMCW) signal according to the periodic characteristic of LFMCW signal. Firstly, the characteristic of autocorrelation function is analyzed and the modulated period of LFMCW signal is estimated by searching the peaks of autocorrelation function. Then, the LFMCW signal is segmented in several parts based on the modulated period in order to have CWHT. By searching the peak of CWHT and beginning time, the chirp rate and initial frequency of LFMCW signal are estimated eventually. The Signal-to-Noise Ratio (SNR) formula of CWHT is derived theoretically and related calculations about CWHT are analyzed. Not only does the proposed algorithm reduce the impact of time-frequency cross term, but also has low computational complexity. At the same time, the algorithm can get noncoherent integration in several periods, that improves the ability of immunity to noise. The results of simulation verify that the proposed algorithm has a good performance of parameter estimation at a low SNR. |
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