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引言微波和数字技术的不断进展已引起了数字瞬时测频(IFM)接收机(有时称为数字鉴频器)的发展。由于 IFM 接收机对雷达信号有高的截获概率,当然还由于它能在逐个脉冲的基础上测量频率,所以它是任何监视系统的重要组成部分。在本文中,我们将讨论 IFM 接收机的一般系统应用,然后重点讨论具有500MHz 带宽的覆盖0.5～18GHz频域的可调谐的 IFM 接收机。这种接收机由一个宽中频带宽的0.5～18GHz 的微波调谐器和一部 IFM 接收机组成,其中后者包括一个能提供粗的和精的正弦和余弦视频输出的
INTRODUCTION The continuous development of microwave and digital technologies has led to the development of digital transient frequency-measuring (IFM) receivers, sometimes referred to as digital frequency discriminators. Since IFM receivers have a high probability of interception of radar signals and, of course, they are an important part of any monitoring system because of their ability to measure frequency on a pulse-by-pulse basis. In this article, we will discuss the general system applications for IFM receivers, and then focus on tunable IFM receivers covering the 500-1800 MHz band covering the 0.5-18 GHz frequency band. The receiver consists of a wide mid-band 0.5 to 18 GHz microwave tuner and an IFM receiver, which includes a coarse and fine sine and cosine video output