AUTOMATIC IMAGE REJECTION CALIBRATION FOR RADAR SYSTEMS USING QUADRATURE TRANSCEIVERS

• Main Author: Tzadok, Asaf
• Format: Patent
• Language: English
• Published: 25.08.2022
• 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

A method of automatic image rejection and monitoring of a frequency modulated continuous-wave (FMCW) radar system, includes generating a quadrature FMCW signal comprising an in-phase signal and a quadrature signal by a dual output FMCW signal generator. The in-phase signal and the quadrature signal are transmitted. A radar signal comprising a response in-phase and a quadrature signal is received in response to the transmitted in-phase signal and the quadrature signal. The response in-phase signal and quadrature signals are provided to an analog to digital converter (ADC). An in-phase beat signal (Beat-I) and a quadrature beat signal (Beat-Q) are extracted from the ADC, based on a received windowing signal. A relative phase and/or amplitude adjustment is generated by providing a phase calibration variable (θt) and/or an amplitude calibration variable (At) as input to the dual output FMCW signal generator, based on a correlation between the Beat-I and the Beat-Q.