低重频PD雷达的临界散射截面计算方法

提出了低脉冲重复频率PD(Pulse Doppler)雷达探测飞行器目标的临界散射截面的计算方法.针对低重频PD雷达对目标的发现概率计算过程中所遇到的问题,采用临界仰角法处理雷达的未知参数,将之合并为雷达系统特征常数.将低重频PD雷达的旁瓣杂波合理等效为白噪声,处理目标频移落在旁瓣杂波区的情况.采用等效杂波散射截面积叠加旁瓣杂波中目标临界散射截面处理目标频移落在主瓣杂波区的问题,并考虑偏置相位中心天线(DPCA)技术对目标频移落在主瓣杂波中时临界散射截面的影响,使计算结果更合理,从而完善低脉冲重复频率PD雷达在全频域中临界散射截面的计算方法.该方法可应用于计算目标突防时的发现概率.最后以E－2C预警机为例计算某目标突防过程中的临界散射截面. 

Calculation method of critical radar cross section of low pulse repetition frequency PD radar

A solution to the problem of calculation on critical radar cross section (RCS) of low pulse repetition frequency (LPRF) PD radar was given. The critical elevation method was adopted to deal with the unknown radar parameters, and combine those parameters into a radar character constant. When the target′s signallocated in sidelobe clutters area, the problem was dealt with by treating the sidelobe clutters of LPRF PD radar as noise. While the target′s signal located in main beam clutters area, the problem was dealt with by adding the equivalent clutters RCS into the critical RCS of sidelobe, the displaced phased center antenna(DPCA) technology′s effect on critical RCS was considered too. All of which complete the critical RCS calculating method in the whole spectrum of LPRF PD radar, and the method could be used to solve the problem on detection probability of target. At last, an example of E-2C detecting a target was given.