A Time Domain Side Lobe Blanking Method Applied to High Integration Phased Array Radar
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Abstract:
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.