基于二维相控阵体制的“低慢小”目标探测雷达频率捷变技术

Frequency agility technology for“low-flying,slow and small”target detectionradar based on two-dimensional phased array system

“低慢小”无人机由于飞行高度低、飞行速度慢、体积小等特点,在多径效应的影响下,一直是雷达目标探测的一个难点。文章在分析了频率捷变带宽对于多径的改善效果后,提出了基于二维相控阵体制的频率捷变技术,通过频率捷变技术结合二维相控阵波束固定不会因为转动带来回波幅度调制的优点,采用相参积累的脉冲组间频率捷变改善雷达探测性能。在雷达整机上进行外场技术验证,在1 GHz的天线带宽内进行频率捷变。实测结果表明,采用该技术能够提升雷达对于极低空飞行目标的探测性能。

Due to the characteristics of low altitude,slow flight speed,and small size,the“low-flying,slow and small”drone has always been a difficulty in radar target detection under the influence of multi-path effects.After analyzing the improvement effect of frequency agility bandwidth on multi-path,the article proposes a frequency agility technology based on the two-dimensional phased array system.By combining frequency agility technology with the advantage that the two-dimensional phased array beam is fixed and does not cause echo amplitude modulation due to rotation,the coherent accumulation pulse group frequency agility is used to improve radar detection performance.Perform field technology verification on the entire radar system,and perform frequency agility within 1 GHz antenna bandwidth.The actual measurement results indicate that using this technology can improve the radar’s detection performance for extremely low altitude flying targets.