Doppler Shift Tolerance of Typical Pseudorandom Binary Sequences in PMCW Radar

Lucas Giroto de Oliveira; Theresa Antes; Benjamin Nuss; Elizabeth Bekker; Akanksha Bhutani; Axel Diewald; Mohamad Basim Alabd; Yueheng Li; Mario Pauli; Thomas Zwick

doi:10.20944/preprints202203.0396.v2

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preprints.org > engineering > electrical and electronic engineering > doi: 10.20944/preprints202203.0396.v2

Preprint Article Version 2 Preserved in Portico This version is not peer-reviewed

Doppler Shift Tolerance of Typical Pseudorandom Binary Sequences in PMCW Radar

Lucas Giroto de Oliveira

^* ,

Version 1 : Received: 29 March 2022 / Approved: 31 March 2022 / Online: 31 March 2022 (07:07:12 CEST)
Version 2 : Received: 13 April 2022 / Approved: 14 April 2022 / Online: 14 April 2022 (12:08:53 CEST)

A peer-reviewed article of this Preprint also exists.

Giroto de Oliveira, L.; Antes, T.; Nuss, B.; Bekker, E.; Bhutani, A.; Diewald, A.; Alabd, M.B.; Li, Y.; Pauli, M.; Zwick, T. Doppler Shift Tolerance of Typical Pseudorandom Binary Sequences in PMCW Radar. Sensors 2022, 22, 3212. Giroto de Oliveira, L.; Antes, T.; Nuss, B.; Bekker, E.; Bhutani, A.; Diewald, A.; Alabd, M.B.; Li, Y.; Pauli, M.; Zwick, T. Doppler Shift Tolerance of Typical Pseudorandom Binary Sequences in PMCW Radar. Sensors 2022, 22, 3212.

Abstract

In the context of all-digital radar systems, phase-modulated continuous wave (PMCW) based on pseudorandom binary sequences (PRBSs) appears a prominent candidate modulation scheme for applications such as autonomous driving. Among the reasons for that are its simplified transmitter architecture and lower linearity requirements, e.g., compared to orthogonal-frequency division multiplexing radars, as well as its high velocity unambiguity and multiple-input multiple-output operation capability that are characteristic of digital radars. For appropriate operation of a PMCW radar, choosing a PRBS whose periodic autocorrelation function (PACF) has low sidelobes and high robustness to Doppler shifts is paramount. In this sense, this article performs an analysis of Doppler shift tolerance of the PACFs of typically adopted PRBSs in PMCW radar systems supported by simulation and measurement results. To accurately measure the Doppler-shift-induced degradation of PACFs, peak power loss ratio (PPLR), peak sidelobe level ratio (PSLR), and integrated-sidelobe level ratio (ISLR) were used as metrics. Furthermore, to account for effects on targets whose ranges are not multiples of the range resolution, oversampled PACFs are analyzed.

Keywords

Doppler shift; periodic autocorrelation function; phase-modulated continuous wave; pseudorandom sequence; radar

Subject

Engineering, Electrical and Electronic Engineering

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Comments (1)

Comment 1

Received: 14 April 2022
Commenter: Lucas Giroto de Oliveira
Commenter's Conflict of Interests: Author

Comment: Revised paper according to anonymous Reviewers' comments. Equations in the system model have been rewritten in more detail and additional explanations to both the system model and the physical meaning of PPLR have been added.

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