7-1 同时比较信号的ACH系统的结构图 a)定向设备对于“无源”和“有源”的定向,即在系统中用定向天线只是接收信号,或者既照射目标而又相应地接收信号的情况,我们以相位定向系统为例(图6-8a),更详细地研究定向特性方程。如果天线系统的能流密度等于P,那么在“无源”定向的情况下,中频放大器输出端的电压(图6-8a)可写成: 7-1 Block diagram of the ACH system for comparison of signals at the same time a) Directional equipment For both “passive” and “active” orientation, directional antennas are used in the system to receive signals only or to receive signals , We take the phase orientation system as an example (Figure 6-8a) to study the directional characteristic equation in more detail. If the energy density of the antenna system is equal to P, the voltage at the output of the IF amplifier (Figure 6-8a) can be written as: “passive”