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传统延时估计方法的精度受采样间隔的限制。为提高精度,提出一种新的适用于宽带信号的分数延时估计方法。该方法将周期图法与抛物线插值应用于带限随机信号的互相关谱,可以获得连续的延时估计。文中通过一系列仿真实验对该方法与其他分数延时估计方法的性能进行比较。结果表明,该方法的性能优于其他估计方法,在信噪比较高的情况下,可以接近克拉美罗下界。由于发射信号具有宽带和随机的特点,该方法适用于低截获概率雷达。
The accuracy of the traditional delay estimation method is limited by the sampling interval. In order to improve the accuracy, a new method of fractional delay estimation for wideband signals is proposed. The method applies the periodic graph method and the parabolic interpolation to the cross-correlation spectrum of the band-limited random signal, and obtains a continuous delay estimation. The paper compares the performance of this method with other fractional delay estimation methods through a series of simulation experiments. The results show that the performance of this method is superior to other estimation methods. Under the condition of high signal-to-noise ratio, the method can approach Keramide lower bound. Due to the wideband and random characteristics of the transmitted signal, this method is suitable for low probability of interception radar.