Method for measuring instantaneous frequency of band-limited signal

• Main Authors: WANG ZIQIAN, XIONG CHEN, MA LIANG, GUO XUCHEN, ZHOU WEIGUANG, XU CHENGLIANG
• Format: Patent
• Language: Chinese; English
• Published: 21.04.2023
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention provides a band-limited signal instantaneous frequency measurement method, which comprises the following steps of: S1, determining instantaneous pulse string sampling parameters based on spectrum distribution of band-limited signals; s2, sampling a band-limited signal s based on the instantaneous pulse string sampling parameter, and obtaining a discrete digital signal sequence xr of the band-limited signal s; s3, determining a guide frequency sequence fg in combination with the instantaneous pulse string sampling parameters and the frequency spectrum information of the signal to be measured, and finally generating an analysis reconstruction operator Rpa; s4, based on the analytic reconstruction operator Rpa and the sampling real sequence xr, calculating an analytic signal z of the band-limited signal s at the tref moment; and S5, calculating the instantaneous frequency at the sampling reference time tref, z, and realizing reconstruction of a complete signal at the sampling reference time tref. 本