基于改进OMP算法的跳频信号跳变时刻精确估计

跳变时刻是跳频信号最重要的参数之一，精确估计跳变时刻有助于正确接收跳频信号，准确获取跳周期、跳频频率等参数。但是现有方法得到的跳变时刻精度不高，抗干扰能力较弱，为此提出了一种基于改进OMP算法的跳变时刻精确估计新方法。首先根据跳频信号原理建立了跳变时刻估计的稀疏表示模型；然后用改进OMP算法求解该模型提取跳变时刻。理论分析和仿真结果证明了该方法能够获取高精度的跳变时刻，估计性能优于现有算法。

Hop Timing Precise Estimation for Freqence-Hopping Signals Based on Improved OMP Algorithm

Hop Timing is one of the most important parameters of FH signals, which is crux to receive the FH signals and estimate other parameters, such as hop duration, hopping frequencies and so on. The problem is that hop timing estimates derived from existing methods are coarse and unreliable, therefore, a novel method for estimating hop timing for FH signals precisely is proposed based on improved OMP algorithm. Firstly, the sparse representation model for hop timing estimation is established according to the principle of FH signals. Then, the improved OMP is used to solute the model and get hop timing finally. The theoretical analysis and simulation results verify the method is capable of obtaining precise hop timing, and is better than current methods.