HPRF脉冲多普勒频率步进雷达信号处理与参数设计

频率步进雷达是一种距离高分辨雷达,传统的处理方法是采用频时转换(IDFT)获得目标的一维距离像,实际上其处理也可以采用时频转换(DFT)的方式进行,这时也可把频率步进雷达看作是一种载频跳变的脉冲多普勒(PD)雷达.采用这种分析方法的优点是,在高重复频率(HPRF)的情况下,可以通过雷达系统的参数设计和信号处理,同时获得不模糊的测速性能和距离高分辨性能,并解决HPRF PD雷达的距离模糊问题.本论文在分析频率步进雷达时频转换(DFT)处理的基础上,给出了HPRF PD频率步进雷达系统参数设计准则及频时耦合的解决方法,以及距离模糊问题的解决方案.理论分析和仿真结果证明,这种雷达体制可以同时获得不模糊测速和距离高分辨性能.

Signal Processing and Parameter Design of HPRF Pulsed-Doppler Stepped-Frequency Radar

Stepped-frequency radar has the ability of high range resolution(HRR).It normally adopts frequency-time transformation(IDFT) processing to get the range profile of targets.Alternatively stepped-frequency radar can also use time-frequency transformation(DFT) processing,with which it is seen as a kind of pulsed-doppler(PD) radars that use stepped-frequency pulses.Through parametric design and signal processing methods of the radar system,DFT method can achieve both unambiguous velocity and high resolution ranging in a single dwell under HPRF circumstances.The range ambiguity problem in HPRF PD radars can be resolved by careful design of parameters and signal processing methods.This paper analyzes the time-frequency transformation processing of stepped-frequency radars,based on which the HPRF PD stepped-frequency radar system's parameter design principle,solutions to the frequency-time coupling issue and range ambiguity are also given.Both theoretical analysis and simulation result prove that this radar scheme can simultaneously achieve unambiguous velocity and high resolution ranging.