US 11,656,322 B2
Method for reducing mutual interference in radars
Canan Aydogdu, Gothenburg (SE); and Henk Wymeersch, Gothenburg (SE)
Assigned to RADCHAT AB, Gothenburg (SE)
Filed by Chalmers Ventures AB, Gothenburg (SE)
Filed on Jul. 3, 2019, as Appl. No. 16/502,414.
Prior Publication US 2021/0003662 A1, Jan. 7, 2021
Int. Cl. G01S 7/02 (2006.01); G01S 7/00 (2006.01); G01S 7/35 (2006.01); G01S 13/931 (2020.01)
CPC G01S 7/023 (2013.01) [G01S 7/006 (2013.01); G01S 7/0235 (2021.05); G01S 7/35 (2013.01); G01S 13/931 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A distributed FMCW radar communication system for interference mitigation in an ego unit comprising a RadCom unit configured for radar sensing in a radar mode and for data communication in a communication mode with at least one target unit comprising a RadCom unit by switching between the radar mode and the communication mode in time and using separate frequency bands for the radar mode and the communication mode, using a random medium access technique for communication, the distributed FMCW radar communication system being configured such that a communicated control message information is used for co-allocated multiple FMCW radar sensors in both the ego unit and the at least one target unit to a portion of a radar frame duration (Tf) which is one of a plurality of radar frame durations (Tf), wherein the ego unit and the at least one target unit transmit a control message, in each radar frame duration (Tf), the control message comprising a starting time of radar transmission of each unit to the other units prior to radar transmission of each unit, such that each unit selects a non-overlapping starting time for its radar transmission and wherein the starting times of different FMCW radar sensors are separated sufficiently such that they are orthogonal,
wherein one of the plurality of radar frame durations (Tf) of the FMCW radar communication system is divided in a number of time slots (Tk), where the RadCom unit of the ego unit is in the communication mode in a first time slot and transmits a radar control message which is one of the control messages, and where in the following time slot the RadCom unit of the ego unit is in the radar mode and transmits radar chirps, and where the RadCom unit of the ego unit is in the communication mode configured to receive a control message in all time slots except the time slot in which it is in the radar mode.