A simulation and construction method of the target multi-highlight

The ocean environment is a time-varying system function, and the instability effect of single-frequency signal in the channel limits its application. However, the linear frequency modulation (LFM) signal has a certain bandwidth. Even if the loss of a frequency point is too large, the other frequency points are still returned by the echo energy, which can overcome the limitation of the instability effect of single frequency. When affected by Doppler in the ocean, it may cause the peak value to drop and widen. The hyperbolic frequency modulation (HFM) signal has Doppler invariance. Therefore, this paper uses the HFM signal for the target echo simulation and construction, which has a multi-highlight structure. This paper uses the up-sampling and down-sampling methods to achieve accurate time-delay. The situation of target without Doppler and different sizes of Doppler and different depths of the target are made, and the results of the target multi-highlight are proposed. This method can be useful in engineering application.