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超外差接收机的最新发展是在频率合成器作为可控本振和完善的控制电路诸方面。频率合成器可以改善接收机的测频精度;控制电路可以改善信号显示的质量和使接收机具有多用途性。同时,宽带微波超外差接收机前端往往接入YIG预选滤波器,以避免接收机工作于密集信号环境时产生许多互调分量。YIG预选器和频率合成器自动跟踪锁定技术对警戒接收机和电子对抗用的频率瞄准接收机来说是十分理想的。一、采用频率合成器的超外差接收机超外差接收机的本振源采用频率合成器后获得的测频精度可比用YIG振荡器或VCO振荡器作本振源提高1～2个数量级,且可用计算机对它的工作状态进行灵活控制。因此频率
The latest development of superheterodyne receivers is the use of frequency synthesizers as a controllable local oscillator and a complete control circuit. The frequency synthesizer can improve the frequency precision of the receiver; The control circuit can improve the signal display quality and make the receiver versatile. Meanwhile, the front end of the broadband microwave superheterodyne receiver often accesses the YIG preselection filter to avoid many intermodulation components when the receiver operates in a dense signal environment. YIG Preselector and Frequency Synthesizer Auto-Tracking Locking is ideal for alert receivers and frequency-aiming receivers for electronic warfare. First, the use of frequency synthesizer superheterodyne receiver superheterodyne receiver using frequency synthesizer obtained after the frequency measurement accuracy than with YIG oscillator or VCO oscillator for the local oscillator to increase by 1 to 2 orders of magnitude , And can use computer to flexibly control its working status. So the frequency