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本发明提供的频率扫描截获接收机能够把任一给定的接收目标信号压缩成具有单一频率的谱线,这种接收机比只提供sin x/x曲线的一般频率扫描接收机增添了两个新部件:一个鉴频器和一个差分放大器。鉴频器提供的误差电压E_e与接收机的中频和混频器输出信号的瞬时频率之差成比例。差分放大器的输入信号是误差信号E_e和与频率扫描振荡器的瞬时频率成比例的电压E_f。差分放器输出一个与目标信号频率成比例的频率补偿电压E_e此电压并用作显示部分的水平扫描电压。
The present invention provides a frequency sweep acquisition receiver capable of compressing any given reception target signal into a spectrum having a single frequency which adds two more than a conventional frequency sweep receiver which provides only sin x / x curves New parts: a frequency discriminator and a differential amplifier. The error voltage E_e provided by the frequency discriminator is proportional to the difference between the instantaneous frequency of the intermediate frequency of the receiver and the output signal of the mixer. The input signal of the differential amplifier is the error signal E_e and the voltage E_f proportional to the instantaneous frequency of the frequency swept oscillator. The differential amplifier outputs a frequency compensation voltage E_e proportional to the target signal frequency and serves as the horizontal scanning voltage of the display section.