Research on Digital Instantaneous Frequency Measurement Based on Passive Positioning System

The passive microwave detection and positioning technology is introduced into the low-altitude area alert and azimuth system for near-earth ground. The technique of single pulse orientation measurement receiver and digital instantaneous frequency measurement are used to locate the pulse description word (PDW) of the enemy target parameters. This paper studies an instantaneous frequency measurement technique using a seven-channel digital delay line frequency discriminating system in the frequency range of 8 to 18 GHz, and monitors and corrects the frequency measurement error caused by temperature in real time. Theoretically, it has a high accuracy of frequency measurement.