【摘要】 在深入分析线性调频(Linear Frequency Modem,LFM)信号特征和短波信道环境基础上,针对短波信道中LFM提出了一种宽带自动侦察和参数估计新算法。该算法合理规避了宽带信号转窄带信号处理过程中滤波器难于实现和运算量大的问题,并在兼顾运算速度和设备量的基础上,保证了算法的工作性能。仿真结果表明,在信噪比大于6 dB情况下该算法能从宽带信号中有效的识别出LFM信号,并估计出LFM信号的起始频率、调频斜率和带宽等调制参数。更多还原

【Abstract】 Based on the detailed analysis of the characteristics of LFM and short-wave channel,a new method of automatic reconnaissance and parameter measurement for LFM signal in short-wave channel is put forward.This method correctly solves the problem of too high operation cost and the difficulty in the implementation of filters which are necessary in the transformation from wideband signals to narrowband signals,and simultaneously ensures a good operating performance with a moderate operation cost and hardware requirements.The simulation result indicates that this algorithm can distinguish LFM signal from numerous wideband signals and correctly measure such parameters as start frequency,frequency modem slope and bandwidth when SNR is greater than 6 dB.更多还原