US 12,078,749 B2
Cascaded radar system calibration of baseband imbalances
Karthik Subburaj, Bangalore (IN); Vashishth Dudhia, Gujarat (IN); and Shailesh Joshi, Karnataka (IN)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Mar. 10, 2023, as Appl. No. 18/181,938.
Application 18/181,938 is a division of application No. 17/097,390, filed on Nov. 13, 2020, granted, now 11,630,185.
Claims priority of application No. 201941046299 (IN), filed on Nov. 14, 2019.
Prior Publication US 2023/0213615 A1, Jul. 6, 2023
Int. Cl. G01S 7/40 (2006.01); G01S 7/35 (2006.01); G01S 13/34 (2006.01)
CPC G01S 7/40 (2013.01) [G01S 7/352 (2013.01); G01S 7/4021 (2013.01); G01S 7/4073 (2021.05); G01S 13/341 (2013.01); G01S 7/4017 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A cascaded radar calibration system comprising:
a plurality of radar devices, each including a transmitter and a receiver, in which:
a first radar device of the plurality of radar devices is configured to transmit a first radar transmission signal at a baseline, unmodulated intermediate frequency (IF) range;
each of the plurality of radar devices is configured to receive and demodulate first radar reflection signals, corresponding to the first radar transmission signal, to generate a respective first IF baseband signal including first range information;
the first radar device further is configured to generate a second radar transmission signal at a modulated IF range; and
each of the plurality of radar devices is configured to receive and demodulate second reflection signals, corresponding to the second radar transmission signal, to generate a respective second IF baseband signal including second range information; and
a calibration component is coupled to each of the plurality of radar devices and configured to compare second range information in a second IF baseband signal from one of the plurality of radar devices to second range information in a second IF baseband signal from another of the plurality of radar devices.