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 article 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 low-complexity 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
Pages (from-to)743-751
Number of pages9
JournalIEEE Transactions on Aerospace and Electronic Systems
Issue number1
StatePublished - 1 Feb 2022


  • Ambiguity mitigation
  • Automotive radar
  • Doppler ambiguity
  • Doppler estimation error model
  • High-order phase terms
  • Linear frequency modulated (LFM) radar ambiguity

ASJC Scopus subject areas

  • Aerospace Engineering
  • Electrical and Electronic Engineering


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