获得可变带宽超宽带信号的频谱多次展宽方法

Multiple Spectrum Broadening to Obtain Variable Ultrawideband Signals

采用倍频器扩展LFM(线性调频)信号带宽所产生信号的性能受到倍频环节中非理想特性的影响,如倍频器失真、滤波失真和放大器误差等,针对该问题,提出一种基于频谱多次展宽方法获得可变带宽超宽带线性调频(LFM)信号的新方法。利用LFM信号的频谱多次展宽,获得超宽带LFM信号;通过频谱展宽次数的改变,实现超宽带LFM的带宽变化。仿真实验证明了该方法确实扩展了LFM信号的带宽,且得到了理想的超宽带信号。

A Linear Frequency modulation （LFM） signals which has its bandwidth expanded by multipliers can be affected by the non-ideal characteristics during the process,which may lead to multiplier distortion,filtration distortion,amplifier error,etc.To avoid these problems,this paper proposed a new method of multiple spectrum broadening to obtain a variable bandwidth LFM-UWB signal.Ultrawideband （UWB） signal could be obtained by multiple spectrum broadening; variable bandwidth could be realized by changing the number of times of spectrum broadening.The results of simulation experiment showed that the bandwidth of the LFM signal could be expanded by the method,and the ideal UWB signal was obtained.