超宽带(UWB)冲激雷达目标探测中时域天线阵列波束延时控制扫描是通过天线阵列单元间精确的延时控制实现的。在介绍UWB时域波束延时控制扫描原理的基础上,研制了用于UWB天线时域波束扫描的延时控制器,其延时步进为50 ps,延时精度可达10 ps。利用该延时控制器对单元间距42 cm的4单元UWB天线阵列H面方向进行了单元间延时控制波束扫描测量,扫描步进角度小于2°。结果显示,在0°,10°,20°和30°扫描时,实际扫描角度分别为-0.5°,10.5°,20°和29.5°,与理论计算值之间误差小于1°。

The theory on beam scan of ultrawide-band (UWB) time-domain antenna is introduced,and it is pointed out that accurate delay between antenna units is the key problem. Therefore,an accurate delay-controller,used in beam scan of UWB time-domain antenna array,has been designed with 50 ps delay step and 10 ps precision. Experiments on beam scan of a 4-unit UWB antenna array with unit spacing of 42 cm has been conducted with this controller controlling the delay between units. The scan step of angle is less than 2°,and the actual scan angles are -0.5°,10.5°,20°and 29.5° respectively for the objective angles of 0°,10°,20° and 30°. The error between experimental result and theoretical caculation is under 1°.