US 12,146,947 B2
OFDM radar sensor system having an actively retransmitting repeater
Benedikt Schweizer, Neu-Ulm (DE); Benedikt Meinecke, Ulm (DE); Christian Waldschmidt, Ulm (DE); and Juergen Hasch, Stuttgart (DE)
Assigned to ROBERT BOSCH GMBH, Stuttgart (DE)
Appl. No. 17/620,365
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed May 5, 2020, PCT No. PCT/EP2020/062382
§ 371(c)(1), (2) Date Dec. 17, 2021,
PCT Pub. No. WO2020/259903, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 10 2019 209 310.8 (DE), filed on Jun. 27, 2019.
Prior Publication US 2022/0236403 A1, Jul. 28, 2022
Int. Cl. G01S 13/75 (2006.01); G01S 13/00 (2006.01); G01S 13/87 (2006.01); G01S 13/931 (2020.01)
CPC G01S 13/751 (2013.01) [G01S 13/003 (2013.01); G01S 13/872 (2013.01); G01S 13/931 (2013.01); G01S 2013/93271 (2020.01)] 10 Claims
OG exemplary drawing
 
1. An OFDM radar sensor system, comprising:
an OFDM radar sensor; and
a repeater;
wherein:
the OFDM radar sensor is installed in a vehicle and is configured to generate and transmit a first signal;
the repeater is installed in the vehicle and is configured to:
receive a first reflection of the first signal;
generate, from the reflection of the first signal, a second signal by modulating the reflection of the first signal with a frequency shift to be orthogonal to the reflection of the first signal; and
transmit the second signal, which has been generated using the reflection of the first signal;
the OFDM radar sensor is configured to:
receive a second reflection of the first signal in a monostatic portion of reflection signals;
receive a reflection of the second signal in a bistatic portion of reflection signals;
separate the bistatic portion of the reflection signals from the monostatic portion of the reflection signals; and
based on the separation:
evaluate the second reflection of the first signal to obtain first object information; and
evaluate the reflection of the second signal to obtain second object information;
correlate the first object information and the second object information to each other; and
detect characteristics of one or more objects in surroundings of the vehicle based on the correlation; and
the correlation includes at least one of the following:
(a) correlating respective object representations at respective frequency positions of the reflection of the second signal, which frequency positions correspond to a double Doppler shift relative to the first signal, to respective object representations at respective frequency positions of the second reflection of the first signal, which frequency positions correspond to a single Doppler shift relative to the first signal; and
(b) correlating respective object representations at respective frequency positions of the reflection of the second signal, which frequency positions correspond to a double travel time from a time of transmission of the first signal to a target, to respective object representations at respective frequency positions of the second reflection of the first signal, which frequency positions correspond to a single travel time from the time of transmission of the first signal to the target.