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前言在很多无线电和雷达应用中,特别是评价系统性能时,接收信号的射频信噪比是一具有理论价值和实用意义的参量。因此,这一参量的测量很重要。但此参量不容易直接测量。直接测量时,要直接在接收机射频电路中应用辐射热测量计或热偶之类功率敏感器件进行测量。如果无信号时噪声功率读数为P_n,有信号时读数为P_s+P_n,从而就可算出信噪比P_s/P_n。也可用比较法进行测量,即将校准过的射频信号发生器连接到输入端,比较此时接收机
Preface In many radio and radar applications, especially when evaluating system performance, the RF signal-to-noise ratio of the received signal is a theoretical and practical parameter. Therefore, the measurement of this parameter is very important. But this parameter is not easy to measure directly. Direct measurement, the radio frequency circuit to be used directly in the receiver using a bolometer or thermocouple and other power-sensitive devices to measure. If there is no signal when the noise power reading P_n, the signal reading P_s + P_n, which can be calculated signal to noise ratio P_s / P_n. Comparison can also be used to measure the calibration of the RF signal generator is connected to the input, compare the receiver