宽带LFM实信号多通道低速采样参数估计

基于余数定理解频率模糊和解线调方法,提出一种在低速采样条件下针对宽带线性调频实信号的参数估计算法。单路欠采样信号与其延迟信号共轭相乘,根据输出信号的单频特性利用谱峰检测进行调制斜率的无模糊估计。通过合成无载波的线性调频信号对三路欠采样信号解线调处理,运用余数定理进行初始频率的无模糊估计。该算法稳定性好,精度高,易于在硬件上实现,具有实用价值。

An Algorithm for Parameters Estimation of Wideband LFM Real Signal with Multiple Sub-Sampling Channels

Based on the remainder theorem and direct dechirp operation, the algorithm for pa-rameters estimation of the sub-sampling wideband LFM real signal is presented. Since the con-jugation multiplication product of the single sub-sampling signal and its different delay is single tone , the chirp rate is estimated unambiguously by spectrum peak search detection. Then the di-rect dechirp operations are finished by the digital synthesis chirp signal without carrier for three difference sub-sampling signals, and the initial frequency can be estimated unambiguously by the remainder theorem. The algorithm is realized with good stability and high precision, and is simple enough to be easily realized in the hardware. So it is of some practical value.