基于Laguerre变换的宽带LFM信号频谱压缩数字接收方法
doi: 10.3724/SP.J.1146.2005.00905
A Spectrum-Compressed Digital Receiving Method Using Laguerre Transformation for LFM Signal
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摘要: 该文提出了一种新的宽带线性调频(LFM)信号频谱压缩数字接收方法。文中分析了Laguerre变换的频率卷绕特性以及对LFM信号的频谱压缩特性，利用数字域Laguerre变换构建可变压缩度的频谱压缩网络，使信号带宽始终处于接收机处理带宽以内，相应达到改变接收机带宽的目的，有利于减小后续基带信号处理的数据量。压缩信号可利用频谱恢复网络实现信号的重构，LFM信号的初始频率和调频斜率在频谱恢复后仍可较精确估计。仿真结果验证了方法的正确性和有效性。Abstract: This paper proposes a novel spectrum-compressed digital receiving method using Laguerre transformation for LFM signal. Firstly, the frequency-warped characteristic of Laguerre transformation and its spectrum-compressed characteristic for LFM signal are discussed. Then, the spectrum-compressed network with variable compression degree is constructed by utilizing the digital structure of Laguerre transformation to keep the signal bandwidth within the receiver bandwidth, which reduces the amount of data to be processed in baseband. The spectrum-compressed signal can be reconstructed by using the spectrum-reconstructed network. The modulation rate and initial frequency of the spectrum-reconstructed LFM signal can be estimated precisely. Finally, the simulation results show the correctness and validity of the method.
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