三十年来,瞬时测频(IFM)接收机已发展成为现代EW系统的关键性设备,其基本功能是通过测量所收到的雷达信号的射频(RF)频率和其它参数(如幅度、脉宽、到达时间、脉内频率及相位调制特征)对分选和识别这些信号助一臂之力。照通常的定义,我们可以把IFM接收机视为一部完整的接收机,其中的频率测量部分是数字鉴频器(DFD),它只产生数字频率数据。IFM的基本特点是能够在宽动态范围内(80dB)和很宽的RF带宽内迅速地(数百ns量级)给出脉冲或连续波信号的数字化参数数据。举例来说,标准设备覆盖的频段为0.75～1.5GHz,2～4 GHz,2～6GHz,6～18GHz,但超宽带设计能瞬时覆盖整个2-18GHz的微波频段。基本的没计目的是在宽的微波频段内给出其中所观察到的最强 For thirty years instantaneous frequency measurement (IFM) receivers have evolved into key devices in modern EW systems. Their basic function is to measure the radio frequency (RF) frequency of received radar signals and other parameters such as amplitude, pulse width , Time of arrival, intra-pulse frequency, and phase modulation characteristics help to sort and identify these signals. As a general definition, we can think of an IFM receiver as a complete receiver, where the frequency measurement part is the digital frequency discriminator (DFD), which produces only digital frequency data. The basic feature of IFM is the ability to quickly (digitally hundreds of ns) digitize parametric data of pulsed or continuous wave signals over a wide dynamic range (80dB) and a wide RF bandwidth. For example, the standard equipment covers the frequency band 0.75 ~ 1.5GHz, 2 ~ 4GHz, 2 ~ 6GHz, 6 ~ 18GHz, but the ultra-wideband design can instantly cover the entire 2-18GHz microwave band. The basic not-for-purpose is to give the strongest observed in the wide microwave band