提出一种应用于高集成度相控阵雷达的时序匿影方法,阐述了其原理、工作过程及在某雷达样机上的试验验证情况。具体来说,通过给同一副接收天线加不同的权值,分时使用接收天线,将前帧数据当做匿影信号与后帧正常接收信号的幅度进行对比,确定后帧是否为主瓣照射时的目标回波,可以在无专用匿影辅助天线时,实现对副瓣回波的匿影,解决匿影系统设备量与高集成度的矛盾。文中还对工程验证过程中3 单元和8 单元时序匿影的做法、优缺点进行了对比,结果表明,3 单元时序匿影由于匿影波束宽,采用匿影和波束即可取得良好的匿影效果,但由于接收到的信号能量低且存在较大功分损失,目标较远时匿影信号被噪声淹没,造成匿影功能无法使用;采用8 单元时序匿影方法,选用合适的门限,且充分利用匿影和差路信息,可解决此问题,获得优异的匿影效果。

A time domain side lobe blanking (SLB) method which can be applied to high integration phased array has been proposed, whose working principle and working process are illustrated in detail and this approach has been successfully applied to a millimeter wave phased array radar. Specifically, reception antenna works with two different weights being used in turn, one with wide beam and anther, narrow beam. The ratio of the amplitude of the wide beam reception signal to that of the narrow beam reception signal is used to evaluate whether the target echo was the result of the main lobe irradiation, by which, side lobe blanking has been achieved without a dedicated blanking antenna, and thus contradiction between the complexity of the SLB system and high integration has been alleviated. 3-antenna-element and 8-antenna-element time-domain SLB have all been considered and put into practice in the development process. Working mechanism and advantages and disadvantages are compared. The results suggest that, benefiting from the wide beam, the SLB effect of 3-antenna-element time-domain SLB was satisfactory with only signal of the SLB sum beam being used, but due to poor echo energy and high power dividing loss, when the target was far away from the radar, the SLB signal would be submerged by noise and lead to malfunction of the time-domain SLB; while when 8-antenna-element timedomain SLB was adopted, good SLB effect was achieved with signals from both the SLB sum and difference beam.

TN958