Resolving doppler unambiguity in TDM-MIMO radars based on spatial phase change rate

US12146981B2 · kind B2 · utility

Assignee

• Axis AB · SE

Inventors

• Anders Lloyd · Lund, SE
• Anders Mannesson · Lund, SE
• Bertil Roslund · Lund, SE
• Mattias Simonsson · Lund, SE
• Stefan Adalbjörnsson · Lund, SE

Key dates

• Filing date: Jul 25, 2023
• Grant date: Nov 19, 2024
• Expiry date: Jul 25, 2043

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S2013/0263
• WIPO field: Measurement
• WIPO sector: Instruments

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.