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本文主要讨论改善半主动雷达寻的中程舰空导弹低空性能的技术途径.除适当选择雷达参数如波长、波束宽度、脉冲宽度等来尽量减小海杂波强度外,抑制海杂波主要依靠多普勒效应.跟踪雷达中的动目标显示与动目标跟踪,以及全程连续波半主动雷达号的制导体制都是利用了多普勒效应来抑制海杂波,使目标从杂波中区分出来.此外也可利用频率捷变对海杂波进行去相关、然后积累的方法.对于海平面的镜面反射,可以选择垂直极化及利用其布鲁斯特效应来减弱镜象的影响.跟踪雷达可采用定角偏轴开环跟踪方式减弱多路径效应而实现低角跟踪.导引头也可利用目标与镜象的多普勒分辨力来区分目标与镜象,实现对目标的跟踪.
In this paper, we mainly discuss the technical ways to improve the low-altitude performance of the medium-range ship-to-air missiles that are found by semi-active radar.In order to minimize the sea clutter intensity, we choose the radar parameters such as wavelength, beam width and pulse width, Doppler effect.Track radar in the moving target display and moving target tracking, as well as the whole continuous wave semi-active radar number guidance system is the use of Doppler effect to suppress sea clutter, so that the target from the clutter to distinguish In addition, frequency agility can also be used to de-correlate sea clutter and then accumulate it. For sea level specular reflection, the vertical polarization can be selected and the Brewster effect can be used to attenuate the effects of the image. Tracking radars can be used Fixed angle off-axis open-loop tracking reduces the multipath effect and low-angle tracking. Seeker can also use the target and mirror Doppler resolution to distinguish between the target and the mirror to achieve the target tracking.