一种基于查表的解速度模糊算法

摘要

According to Nyquist sampling theorem, to make sure the signal is not distorted, the sampling frequency is required to be at least twice of the max frequency of the signal. As for radar, the pulse repetition frequency(PRF) and the Doppler frequency of the target don't satisfy this theory most of the time, then velocity ambiguity occurs. It becomes an important task for radar to solve velocity ambiguity and estimate the target velocity. However, most methods are complex and has high computational load and low precision. A new look-up method is proposed in this paper. Comparing with other methods, this method is effective, realizable and has low computational load. Finally, simulation results confirm the validity of this method.%根据奈奎斯特第一采样定理,采样频率要大于信号频率的两倍,信号才会不模糊.但是雷达的脉冲重复频率和目标的多普勒频率并不一定会满足此定理,这样就产生了速度模糊.解速度模糊并准确地估计目标的速度是雷达的一个重要任务,但通常的解模糊算法存在算法复杂、运算量大、精度不高等问题.提出了一种基于查表的解速度模糊算法,该方法在保证精度和容错的前提下,大大降低了运算量,是一种工程化的方法.最后仿真结果验证了该方法的有效性.