一种扩展三角波线调频信号测距范围的新方法

针对线调频信号测距范围受到最大回波延时限制的问题,提出一种双差拍-傅立叶变换的处理方法。通过将回波信号与两种形式的发射信号分别混频,并对混频信号进行傅立叶变换获取目标距离信息。该方法在损失一定输出信噪比的代价下,扩展了信号的测距范围。理论分析和实验仿真均证明了该方法的有效性。

A New Way to Extend the Ranging Scope of the LFMCW Signal

The ranging scope of LFMCW signal is limited by the setting of maximum echo delay.A new way to use double beat- frequency-FT is proposed.In the method,the echo is mixed with two kinds of transmitted signal,then the mixed signals are Fourier trans- formed to frequency domain respectively.By comparing the location and amplitude of the peaks in the power spectrum,the ranging scope is extended to the whole FM duration.One point to emphasize is that this method bears some degradation in the output SNR.Theory anal- ysis and simulations testify the validation of the method.