公开(公告)号：US20240103128A1

公开(公告)日：2024-03-28

申请号：US18358215

申请日：2023-07-25

Applicant: Axis AB

Inventor： Anders LLOYD ,  Anders MANNESSON ,  Bertil ROSLUND ,  Mattias SIMONSSON ,  Stefan ADALBJÖRNSSON

IPC: G01S7/35 ,  G01S7/03 ,  G01S13/58

CPC classification number: G01S7/354 ,  G01S7/03 ,  G01S13/584 ,  G01S2013/0263

Abstract: A TDM MIMO FMCW radar comprises an array of physical receivers with a first spacing in a first direction and a plurality of physical transmitters arranged with a second spacing in said first direction. A virtual array signal of a range-Doppler bin relating to a scene with a moving object is processed by a phase compensation method, which introduces a phase ambiguity between the subarrays. A positive or negative spatial phase change rate with respect to the first direction is computed based on elements of the compensated virtual array signal corresponding to one subarray at a time. From this, based on the spacings, a spatial phase change between a pair of the subarrays is predicted. Next, a residual phase shift between said pair of subarrays is determined by comparing an actual phase shift of the compensated virtual array signal and the predicted spatial phase shift.