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.

公开(公告)号：US20210349179A1

公开(公告)日：2021-11-11

申请号：US17216749

申请日：2021-03-30

Applicant: Axis AB

Inventor： Adham SAKHNINI ,  Andreas GLATZ ,  Axel LANDGREN ,  Mattias SIMONSSON ,  Anders SKOOG ,  Anders MANNESSON ,  Sebastian HEUNISCH ,  Stefan ADALBJÖRNSSON ,  Karl NORDIN

IPC: G01S7/02 ,  G01S7/35 ,  G01S13/87

Abstract: A method for interference reduction between radar units. The method is performed by a radar unit and comprises: receiving one or more radar frames, wherein the one or more radar frames correspond to one or more respective time intervals during which the radar unit was activated to transmit and receive signals to produce data samples of the one or more radar frames; and determining whether the one or more radar frames have a higher presence of data samples that are subject to interference from other radar units in a first half of their corresponding time intervals than in a second, later, half of their corresponding time intervals. In case the presence is higher in the first half of their corresponding time intervals, a scheduled time interval of an upcoming radar frame to be produced by the radar unit is postponed, and otherwise it is advanced.