Method and device for generating any time-bandwidth nonlinear frequency modulation signal in real time

• Main Authors: WEI YIHAI, ZHANG YONGWEI, QIU JINGSONG, WANG PEI, LIU YANG
• Format: Patent
• Language: Chinese; English
• Published: 30.04.2024
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING

The invention discloses a method and a device for generating any time-bandwidth nonlinear frequency modulation signals in real time. The method comprises the following steps: determining power spectral density according to an integral sidelobe ratio, bandwidth and time width; calculating a discrete numerical value of the instantaneous frequency function through integration of the power spectrum density; constructing a loss function, fitting a polynomial instantaneous frequency function through the instantaneous frequency function, normalizing the bandwidth and the time width, minimizing the loss function, and solving to obtain a group of optimal polynomial coefficients irrelevant to the bandwidth and the time width; integrating the fitted polynomial instantaneous frequency function to obtain a polynomial phase function; reading a polynomial coefficient, calculating a nonlinear frequency modulation signal phase by using a polynomial phase function, and performing real-time calculation to obtain a discrete inte