公开(公告)号：US20240103129A1

公开(公告)日：2024-03-28

申请号：US18446012

申请日：2023-08-08

Applicant: Axis AB

Inventor： Anders MANNESSON ,  Mattias Simonsson ,  Stefan Adalbjörnsson ,  Anders Lloyd ,  Bertil Roslund

IPC: G01S7/35 ,  G01S13/36

CPC classification number: G01S7/356 ,  G01S13/36

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. For each of the subarrays, a frequency spectrum is computed of those elements of the compensated virtual array signal which correspond to consecutive virtual antenna elements generated by physical receivers belonging to the same row. Next, an amplitude-peak frequency is identified jointly for the frequency spectra of the subarrays. Next, a residual phase shift between a pair of the subarrays is determined by comparing, at the amplitude-peak frequency, the respective phases of the frequency spectra.

公开(公告)号：US12146981B2

公开(公告)日：2024-11-19

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 ,  G01S13/02 ,  G01S13/58

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.