一种改进的频率步进雷达信号性能分析

Study of a Modified Stepped-Frequency Radar Signal and Its Performance

在分析目标运动对频率步进信号一维距离像影响的基础上,提出了一种改进的频率步进信号,即参差脉冲重复间隔频率步进信号,研究了这种信号的数学模型和处理方法。理论分析和仿真结果表明,与频率步进信号相比,参差脉冲重复间隔频率步进信号的多普勒性能有了很明显的改善,一维距离像不会随目标的运动而产生失真。另外,根据参差脉冲重复间隔频率步进信号的特点,提出了利用距离微分法实现速度粗补偿和利用脉组误差函数法实现速度精补偿的方法和步骤,仿真结果证明,这两种方法是有效、稳健、可靠的。

Based on analysis of the impact of target motion,Stagger PRI Stepped Frequency（ SPRI-SF） signal is presented. Then,the signal mathematic model and processing method are provided. Both theoretical analysis and simulation result prove,compared with SF signal,the Doppler performance of SPRI-SF signal is obviously improved. The 1-D range profile is distortionless with target motion. Finally,a method using distance differential algorithm to get velocity coarse compensation and using pulse train error function to get velocity accurate compensation is presented. Simulation results prove that two methods have validity,robustness and credibility.