US 11,796,663 B2
Automatic image rejection calibration for radar systems using quadrature transceivers
Asaf Tzadok, New Castle, NY (US)
Assigned to INTERNATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US)
Filed by INTERNATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US)
Filed on Feb. 20, 2021, as Appl. No. 17/180,778.
Prior Publication US 2022/0268914 A1, Aug. 25, 2022
Int. Cl. G01S 13/34 (2006.01); G01S 13/36 (2006.01); G01S 7/40 (2006.01); G01S 7/35 (2006.01)
CPC G01S 13/34 (2013.01) [G01S 7/354 (2013.01); G01S 7/40 (2013.01); G01S 13/36 (2013.01); G01S 7/356 (2021.05)] 20 Claims
OG exemplary drawing
 
1. A frequency modulated continuous-wave (FMCW) radar system comprising:
a quadrature transceiver comprising:
a transmitter having an in-phase input and a quadrature input; and
a receiver having an in-phase output and a quadrature output;
a dual channel FMCW signal generator having two direct digital synthesizers (DDSs), comprising:
a first output coupled to the in-phase input of the transmitter; and
a second output coupled to the quadrature input of the transmitter;
a first splitter coupled between the first output of the dual channel FMCW signal generator and the in-phase input of the transmitter;
a second splitter coupled between the second output of the dual channel FMCW signal generator and the quadrature input of the transmitter;
a first mixer comprising:
a first input coupled to a second output of the first splitter;
a second input coupled to the in-phase output of the receiver; and
an output of the first mixer;
a second mixer comprising:
a first input coupled to a second output of the second splitter;
a second input coupled to the quadrature output of the receiver; and
an output of the second mixer;
a dual channel analog to digital converter (ADC) comprising:
a first input coupled to the output of the first mixer; and
a second input coupled to the output of the second mixer; and
a controller coupled between the dual channel FMCW signal generator and the dual channel ADC.