机载侦察设备中超外差接收机带宽选择

Bandwidth selection of a superheterodyne receiver in airborne reconnaissance equipment

超外差接收机应用于宽带侦察设备时存在截获概率问题,当侦察设备和雷达之间存在相互靠近的运动时,其真正的截获距离是小于最大探测距离的不定值,分析表明平均截获距离与超外差接收机带宽具有很大关系,不同的带宽对应着不同的平均截获距离。结合侦察设备的使用需求,提出了根据平均截获距离选择合适的超外差接收机带宽的方法,仿真结果表明该方法可行。

The problem of intercept probability may occur when a superheterodyne receiver is applied in the wideband reconnaissance equipment. If the reconnaissance equipment and the radar are approaching each other,the actual intercept range is a variable less than the maximum detection range. It is indicated that the average intercept range is closely associated with the bandwidth of the superheterodyne receiver. Different bandwidths correspond to different average intercept ranges.Based on the operation requirements of the reconnaissance equipment,a method of using the average intercept range to select the appropriate bandwidth of the superheterodyne receiver is presented. The results indicate that the method is feasible.