US 11,988,769 B2
Methods and apparatus for velocity detection in MIMO radar including velocity ambiguity resolution
Sandeep Rao, Bangalore (IN); Karthik Subburaj, Bangalore (IN); Dan Wang, Allen, TX (US); and Adeel Ahmad, Richardson, TX (US)
Assigned to Texas Instruments Incorporated, Dallas, TX (US)
Filed by Texas Instruments Incorporated, Dallas, TX (US)
Filed on Jul. 1, 2022, as Appl. No. 17/856,109.
Application 17/856,109 is a continuation of application No. 16/814,531, filed on Mar. 10, 2020, granted, now 11,378,649.
Application 16/814,531 is a continuation of application No. 15/371,754, filed on Dec. 7, 2016, granted, now 10,627,483, issued on Apr. 21, 2020.
Claims priority of application No. 201641023530 (IN), filed on Jul. 9, 2016.
Prior Publication US 2022/0342036 A1, Oct. 27, 2022
Int. Cl. G01S 13/34 (2006.01); G01S 7/35 (2006.01); G01S 13/42 (2006.01); G01S 13/92 (2006.01)
CPC G01S 7/354 (2013.01) [G01S 13/343 (2013.01); G01S 13/42 (2013.01); G01S 13/92 (2013.01); G01S 7/356 (2021.05)] 20 Claims
OG exemplary drawing
 
1. A circuit comprising:
a port adapted to be coupled to a receiver and configured to receive a plurality of chirps; and
a processor coupled to the port and configured to:
estimate a phase shift in a virtual array vector S of signals based on the plurality of chirps received by the port;
correct phases of each element of the virtual array vector S using the phase shift to generate a corrected virtual array vector Sc;
compute a correlation matrix for the corrected virtual array vector Sc;
compute a ratio of two eigenvalues of the correlation matrix;
compare the ratio to a threshold level; and
determine that more than one object is present in the corrected virtual array vector Sc in response to determining that the ratio is greater than the threshold level.