研究基于单个宽带去斜回波同时估计运动目标距离和速度的方法。首先通过分析与推导,得出运动目标宽带去斜回波是线性调频信号,其参数包含了目标的距离和速度等信息的结论。在此基础上提出一种基于FRFT的线性调频信号参数估计方法,利用单个宽带回波精确估计目标距离和速度。该法不仅可实现单/多目标同时测距测速,相比宽窄交替的工作方式,还可将宽带数据率提高一倍,这对宽带成像和目标识别非常有利。仿真分析表明,所提方法不仅计算量小、测距测速精度高,且广泛适用于不同信号时宽、带宽及信噪比情况,具有很好的普适性和稳健性。

A method for the simultaneous estimation of the range and velocity of moving targets based on the single dechirped wideband echo is researched.After accurate analysis and derivation, it is indicated that the dechirped wideband echo of a moving target is a kind of LFM signal, whose parameters contain the range and velocity information of the target.Based on this, a method for the parameter estimation of LFM signals based on FRFT is proposed to accurately estimate the range and velocity of the target by using the single wideband echo.This method can not only realize the simultaneous estimation of the range and velocity of a single target or multiple targets, but also double the PRF of the wideband system compared with the working mode switching between wideband and narrowband.This is very beneficial for wideband imaging and target identification.Simulation results indicate that the proposed method not only has low computational complexity and high estimation accuracy of the range and velocity, but also can adapt to situations of different duration and widebands of the signal and different SNRs.It is an adaptable and robust method.