US 12,228,680 B2
Methods and apparatus to compensate for radar system calibration changes
Karthik Subburaj, Bangalore (IN); Shankar Narayanamoorthy, Bangalore (IN); Karthik Ramasubramanian, Bangalore (IN); Anand Gadiyar, Bangalore (IN); Dheeraj Kumar Shetty, Bangalore (IN); and Shailesh Joshi, Bengaluru (IN)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by Texas Instruments Incorporated, Dallas, TX (US)
Filed on Jul. 12, 2022, as Appl. No. 17/862,738.
Application 17/862,738 is a continuation of application No. 16/513,361, filed on Jul. 16, 2019, granted, now 11,391,815.
Claims priority of application No. 201841040934 (IN), filed on Oct. 26, 2018.
Prior Publication US 2023/0204717 A1, Jun. 29, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G01S 7/40 (2006.01)
CPC G01S 7/40 (2013.01) [G01S 7/4008 (2013.01); G01S 7/4021 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A radar system comprising:
a transmit channel including a programmable shifter;
a receive channel;
a loopback path including at least a portion of the transmit channel and at least a portion of the receive channel;
a loopback measurer configured to:
measure a first loopback response for a first configuration of the transmit and receive channels, wherein, in the first configuration, one of the transmit and receive channels has a current configuration and the other of the transmit and receive channels has a new configuration; and
measure a second loopback response for a second configuration of the transmit and receive channels, wherein, in the second configuration, one of the transmit and receive channels has a different configuration than in the first configuration and the other of the transmit and receive channels has the same configuration as in the first configuration; and
a compensator configured to adjust the programmable shifter based on a difference between the first loopback response and the second loopback response.