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军用雷达常用辅助接收天线来对抗通过主天线副瓣进入的“假”目标或干扰。常用的两种方法是副瓣匿影(SLB)和相参副瓣对消(CSLC),其原理图示于图1a和图1b。在图中所示的例子中,主天线是增益为G_(A1)的仰角波束赋形(余割平方)反射器天线,它带有一个装在其顶部的全向低增益(G_(A2)辅助天线。两个天线各接有单独的接收机RX_1和RX_2,接收机的有效增益分别为G_(RX1)和G_(RX2)。在图1a所示的SLB系统中,将来自两个通道的信号加以比较。如果发现低增益天线比主天线接收到更多的功率,就将主通道信号匿影。这种匿影消除
Military radars commonly use secondary receive antennas to counter “false” targets or interference coming in through the main antenna’s sidelobes. Two commonly used methods are Sidelobe Anchorage (SLB) and Coherent Sidelobe Cancellation (CSLC), the schematic of which is shown in Figure 1a and Figure 1b. In the example shown, the main antenna is an elevation beamforming (cosecant-squared) reflector antenna with a gain of G_ (A1) with an omnidirectional low-gain (G_ (A2) Auxiliary antenna. The two antennas are each connected to a separate receiver RX_1 and RX_2, the receiver effective gain G_ (RX1) and G_ (RX2) .In the SLB system shown in Figure 1a, the two channels from Signal to compare If the low-gain antenna is found to receive more power than the main antenna, the main channel signal is hidden.