US 12,392,885 B2
Multi-static radar detection system for a vehicle
Kamran Ali, Troy, MI (US); Fan Bai, Ann Arbor, MI (US); Andreas Molisch, Los Angeles, CA (US); Nikhil Kowshika Nataraja, Los Angeles, CA (US); and Sudhanshu Sharma, Los Angeles, CA (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US); and UNIVERSITY OF SOUTHERN CALIFORNIA, Los Angeles, CA (US)
Filed by GM Global Technology Operations LLC, Detroit, MI (US); and University of Southern California, Los Angeles, CA (US)
Filed on Oct. 21, 2022, as Appl. No. 18/048,551.
Prior Publication US 2024/0134032 A1, Apr. 25, 2024
Prior Publication US 2024/0230879 A9, Jul. 11, 2024
Int. Cl. G01S 13/58 (2006.01); G01S 13/50 (2006.01)
CPC G01S 13/582 (2013.01) [G01S 13/505 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A multi-static radar detection system for a vehicle, the multi-static radar detection system comprising:
one or more receivers for collecting multi-carrier modulation signals emitted by one or more transmitters that are positioned at base stations located in an environment surrounding the vehicle, wherein the multi-carrier modulation signals include one or more types of reference signals; and
one or more controllers in electronic communication with the one or more receivers, wherein the one or more controllers execute instructions to:
collect, by the one or more receivers, a multi-carrier modulation signal emitted by the one or more transmitters, wherein a time-frequency grid representing the multi-carrier modulation signal is divided into a plurality of resource elements;
calculate a time-varying frequency response for each resource element that is part of the time-frequency grid that contains a corresponding reference signal based on a time-frequency analysis;
perform non-uniform interpolation on at least a portion of unoccupied resource elements that are part of the time-frequency grid to determine a corresponding transfer function, wherein an interpolated time-frequency grid includes the time-varying frequency response and the corresponding transfer function for the unoccupied resource elements, wherein performing non-uniform interpolation on at least the portion of unoccupied resource elements that are part of the time-frequency grid comprises:
performing one-dimensional non-uniform interpolation only for unoccupied resource elements located at the same time interval as a reference signal to determine the corresponding transfer function for the unoccupied resource elements that are part of the time-frequency grid;
determine a Doppler shift and a time delay of a respective object located within the environment surrounding the vehicle based on the interpolated time-frequency grid;
transform a value for the Doppler shift into a velocity value and a value for the time delay into a range value;
cross-correlate the time-varying frequency response for each resource element containing the corresponding reference signal and the corresponding transfer function for the unoccupied resource elements of the interpolated time-frequency grid with a corresponding Doppler shift and a corresponding time delay to determine a correlation sum; and
fill a two-dimensional ambiguity grid with the correlation sum determined for each grid element of the two-dimensional ambiguity grid.