摘要
基于起伏散射截面积(RCS),对机载脉冲多普勒(PD)雷达的地杂波仿真问题,介绍了基于视频信号的模拟方法,给出了具体的计算公式、原理和步骤。该方法有三个优点:首先,有利于地面散射环境模拟;其次,用复散射起伏RCS代替平均RCS,增强了杂波模拟的真实性;最后,可以得出影响运动目标检测的杂波散射元的视频信号。文中对不同脉冲重复频率(PRF)下的地杂波进行了仿真和分析,讨论了其产生的多普勒模糊和距离模糊问题;同时,分析了杂波谱宽wf 的变化对主瓣杂波和旁瓣杂波的影响。仿真结果和理论分析吻合较好,表明这种估算地杂波的方法正确有效。
To solve the problem of simulation of ground clutter with fluctuant radar cross-section (RCS) received by airborne pulse doppler(PD) radar,a method based on the analysis of cohered video is illustrated in this paper. Its theory,basic principles, formula and program steps are discussed in detail. This method has three advantages. First, it is suited for the simulation of ground environment scattering. Next, the simulation authenticity is improved via replacing average RCS by complex fluctuant RCS. Finally, the cohered video of clutter affecting the detection of moving target can be obtained. Computer simulation is made for different pulse repetition frequencies(PRF) which affect the ground clutter. The Doppler and range ambiguities are discussed. This paper also discusses the influence of ground clutter spectrum width(w f) change on the spectrum of mainlobe and sidelobe clutter. The agreement of the simulation results with the theory analysis results indicates that this method can be used to estimate the ground clutter correctly and effectively.
出处
《雷达科学与技术》
2005年第1期25-30,42,共7页
Radar Science and Technology
关键词
起伏RCS
机载PD雷达
地杂渡
脉冲重复频率
仿真
模糊
fluctuant RCS
airborne PD radar
ground clutter
pulse repetition frequency
simulation
ambiguity
