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引言在中频波束形成系统中,天线阵每个单元输出的信号送至各个独立的接收信道上,各个接收信道的输出由波束形成网络(BFN)在中频上组合。各信道上的增益和频率调整装置,可使多波束中频波束形成网络,比在雷达信号频率上能达到更高的设计精度。原因是,射频波束形成网络不可避免的损耗及误差会严重限制低副瓣多波束的形成。中频波束形成网络通常是按以下的假設设计的,即来自每路接收信道的信号的相对
INTRODUCTION In IF beamforming systems, the signals output from each unit of the antenna array are sent to separate receive channels whose outputs are combined at the IF by a beam forming network (BFN). The gain and frequency adjustment on each channel allows the multi-beam IF beam to form a network with higher design accuracy than the radar signal frequency. The reason is that the unavoidable losses and errors in the RF beamforming network can severely limit the formation of low sidelobe multibeam. The IF beamforming network is usually designed on the assumption that the relative signal from each receive channel