Granted Patent B2

US 12,552,407 · App. 18/305,059 · Granted Feb 17, 2026

Inventors: Jessica Bartholdy Sanson (Munich, DE); Jorge Julio Jácome Muñoz (Munich, DE); Kalin Hristov Kabakchiev (Munich, DE); Gustavo Adolfo Guarín Aristizabal (Munich, DE); Andre Giere (Oberpframmern, DE)

Assignee: GM CRUISE HOLDINGS LLC

B60W60/001G01S13/00B60W2420/408

Abstract

Claims (45)

1 . A method performed by a radar system, the method comprising:

transmitting toward a target a radar signal from a first antenna and a second antenna, wherein the first antenna transmits a first transmitted signal comprising a first space-time block code (STBC) over a first channel during a first time slot and the second antenna transmits a second transmitted signal comprising a second STBC over a second channel during the first time slot and the first antenna transmits a third transmitted signal comprising a conjugate of the second STBC over the first channel during a second time slot and the second antenna transmits a fourth transmitted signal comprising a conjugate of the first STBC over the second channel during the second time slot;

receiving at a plurality of receive antennas a first radar return comprising the first transmitted signal and the second transmitted signal reflected by the target during the first time slot and a second radar return comprising the third transmitted signal and the fourth transmitted signal reflected by the target during the second time slot;

applying a matched filter to the first radar return and the second radar return to estimate a filtered signal based on a first product of the first transmitted signal with the first radar return and a second product of the second transmitted signal with the second radar return;

decoding the filtered signal to generate a decoded signal;

estimating a range to the target based on the decoded signal;

performing Doppler estimation on the decoded signal to generate a plurality of Doppler estimations;

performing an angle estimation using the plurality of Doppler estimations;

estimating a position and velocity of the target from the range and the angle estimation; and

providing the estimated position and velocity of the target to an operational environment of a vehicle.

2 . The method of claim 1 , wherein decoding the filtered signals comprises accumulating a signal for respective space-time block codes.

3 . The method of claim 2 , wherein accumulating the signal for respective spacetime block codes comprises generating a sum of time slots in which a given space-time block code is received during a predetermined period of time.

4 . The method of claim 1 , wherein no two transmit antennas employ the same space-time block code in a given time slot.

5 . The method of claim 1 , wherein the radar system is deployed in an autonomous vehicle.

6 . The method of claim 1 , wherein the radar system is configured for phase-modulated continuous wave (PMCW) operation.

7 . A method performed by a radar system, the method

comprising:

transmitting toward a target a radar signal from a first antenna and a second antenna, wherein the first antenna transmits a first transmitted signal comprising a first space-time block code (STBC) over a first channel during a first time slot and the second antenna transmits a second transmitted signal comprising a second STBC over a second channel during the first time slot and the first antenna transmits a third transmitted signal comprising a conjugate of the second STBC over the first channel during a second time slot and the second antenna transmits a fourth transmitted signal comprising a conjugate of the first STBC over the second channel during the second time slot;

receiving at a plurality of receive antennas a first radar return comprising the first transmitted signal and the second transmitted signal reflected by the target during the first time slot and a second radar return comprising the third transmitted signal and the fourth transmitted signal reflected by the target during the second time slot;

applying a fast Fourier transform and a matched filter to the first radar return and the second radar return-to estimate a filtered signal based on a first product of the first transmitted signal with the first radar return and a second product of the second transmitted signal with the second radar return;

decoding the filtered signal to generate a decoded signal;

estimating a range to the target based on the decoded signal;

performing Doppler estimation on the decoded signal to generate a plurality of Doppler estimations;

performing an angle estimation using the plurality of Doppler estimations;

estimating a position and velocity of the target from the range and the angle estimation; and p 1 providing the estimated position and velocity of the target to an operational environment of a vehicle.

8 . The method of claim 7 , wherein decoding the filtered signals comprises accumulating a signal for respective space-time block codes.

9 . The method of claim 8 , wherein accumulating the signal for respective space-time block codes comprises generating a sum of time slots in which a given space-time block code is received during a predetermined period of time.

10 . The method of claim 7 , wherein no two transmit antennas employ the same space-time block code in a given time slot.

11 . The method of claim 7 , wherein the radar system is deployed in an autonomous vehicle.

12 . The method of claim 7 , wherein the radar system is configured for orthogonal frequency division multiplexing (OFDM) operation.

13 . A radar system comprising:

a first antenna and a second antenna, wherein the first antenna transmits a first transmitted signal comprising a first space-time block code (STBC) over a first channel during a first time slot and the second antenna transmits a second transmitted signal comprising a second STBC over a second channel during the first time slot and the first antenna transmits a third transmitted signal comprising a conjugate of the second STBC over the first channel during a second time slot and the second antenna transmits a fourth transmitted signal comprising a conjugate of the first STBC over the second channel during the second time slot

a plurality of receive antennas that receive a first radar return comprising the first transmitted signal and the second transmitted signal reflected by a target during the first time slot and a second radar return comprising the third transmitted signal and the fourth transmitted signal reflected by the target during the second time slot;

a matched filter configured to estimate a filtered signal based on a first product of the first transmitted signal with the first radar return and a second product of the second transmitted signal with the second radar return;

a decoder component that decodes the filtered signal to generate a decoded signal;

a Doppler estimation component that generates a Doppler estimation based on the decoded signal; and

an angle estimation component that generates an angle estimation based on the Doppler estimation;

wherein the radar system is configured to estimate a range to the target based on the filtered signal, estimate a position and velocity of the target from the range and the angle estimation and provide the estimated position and velocity of the target to an operational environment of a vehicle.

14 . The radar system of claim 13 , wherein the decoder component accumulates a signal for the respective space-time block codes.

15 . The radar system of claim 14 , wherein for respective space-time block codes, the decoder accumulates a sum of time slots in which a given space-time block code is received during a predetermined period of time.

16 . The radar system of claim 13 , wherein no two transmit antennas employ the same space-time block code in a given time slot.

17 . The radar system of claim 13 , wherein the radar system is deployed in an autonomous vehicle.

18 . The radar system of claim 13 , further comprising a fast Fourier transform component that operates on the received reflected signal prior to the matched filter.

19 . The radar system of claim 18 , wherein the radar system is configured for orthogonal frequency division multiplexing (OFDM) operation.

20 . The radar system of claim 13 , wherein the radar system is configured for phase-modulated continuous wave (PMCW) operation.

Assignments (2)

Priority Claims (1)

Continuity (1)

References Cited (12)