Automotive Radar Maximum Unambiguous Velocity Extension via High-Order Phase Components

Michael Dikshtein, Oren Longman, Shahar Villeval, Igal Bilik

Research output: Contribution to journalArticlepeer-review


—Doppler ambiguity in the range-Doppler domain
of linear frequency modulated (LFM) continuous wave radars
occurs when a target’s Doppler frequency exceeds half of the
chirp repetition frequency. Doppler ambiguity is common in a
variety of civil and military radar applications, and an extension
of the maximal unambiguous Doppler shift is critical for their
practical use. This work utilizes previously neglected high-order
phase terms in the received LFM radar echo for extension
of maximum unambiguous velocity. A computationally feasible
velocity estimation algorithm using hypotheses testing with local
maximum likelihood is derived. The ability of the proposed lowcomplexity algorithm to estimate previously ambiguous target
velocity is investigated using recorded automotive radar measurements and via simulations. The performance of the proposed
algorithm is evaluated using a novel model of the Doppler
estimation errors that accounts for Doppler ambiguity. The
ability of the derived model to predict the threshold phenomenon
is demonstrated via simulations.
Original languageEnglish
JournalIEEE Transactions on Aerospace and Electronic Systems
StatePublished - 2021


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