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Locating close-range radar reflections measured using time-varying clock offsets

Jansson, Andreas LU orcid and Jakobsson, Andreas LU orcid (2026) In Signal Processing 242.
Abstract

Many forms of small-size radars suffer from minor clock oscillations due to crystalline impurities in their internal clocks, causing time-varying clock offsets between the transmitter and the receivers. This offset causes a bias and an increased variance in the positioning of close-range targets, limiting the achievable accuracy well beyond the expected estimation limitations. Furthermore, an approximative model ignoring the curvature of the impinging wavefront is generally also used to form computationally efficient estimators. Such approximations will further limit the achievable performance, especially for close-range targets. In this paper, we examine the effects of both these forms of performance degradations, deriving analytical... (More)

Many forms of small-size radars suffer from minor clock oscillations due to crystalline impurities in their internal clocks, causing time-varying clock offsets between the transmitter and the receivers. This offset causes a bias and an increased variance in the positioning of close-range targets, limiting the achievable accuracy well beyond the expected estimation limitations. Furthermore, an approximative model ignoring the curvature of the impinging wavefront is generally also used to form computationally efficient estimators. Such approximations will further limit the achievable performance, especially for close-range targets. In this paper, we examine the effects of both these forms of performance degradations, deriving analytical bounds on the expected achievable performance due to both forms of model mismatches. We further introduce a computationally efficient and robust direction of arrival estimator that partly allows for these model mismatches, significantly improving the estimation performance for close-range reflectors as compared to traditional estimators.

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author
and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Clock jitter, DOA estimation, Near-field localization, Radar
in
Signal Processing
volume
242
article number
110418
publisher
Elsevier
external identifiers
  • scopus:105024429061
ISSN
0165-1684
DOI
10.1016/j.sigpro.2025.110418
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2025
id
62334b5c-b150-4817-b6ce-c6a1bdaac3a5
date added to LUP
2026-03-13 14:39:37
date last changed
2026-03-13 14:39:37
@article{62334b5c-b150-4817-b6ce-c6a1bdaac3a5,
  abstract     = {{<p>Many forms of small-size radars suffer from minor clock oscillations due to crystalline impurities in their internal clocks, causing time-varying clock offsets between the transmitter and the receivers. This offset causes a bias and an increased variance in the positioning of close-range targets, limiting the achievable accuracy well beyond the expected estimation limitations. Furthermore, an approximative model ignoring the curvature of the impinging wavefront is generally also used to form computationally efficient estimators. Such approximations will further limit the achievable performance, especially for close-range targets. In this paper, we examine the effects of both these forms of performance degradations, deriving analytical bounds on the expected achievable performance due to both forms of model mismatches. We further introduce a computationally efficient and robust direction of arrival estimator that partly allows for these model mismatches, significantly improving the estimation performance for close-range reflectors as compared to traditional estimators.</p>}},
  author       = {{Jansson, Andreas and Jakobsson, Andreas}},
  issn         = {{0165-1684}},
  keywords     = {{Clock jitter; DOA estimation; Near-field localization; Radar}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Signal Processing}},
  title        = {{Locating close-range radar reflections measured using time-varying clock offsets}},
  url          = {{http://dx.doi.org/10.1016/j.sigpro.2025.110418}},
  doi          = {{10.1016/j.sigpro.2025.110418}},
  volume       = {{242}},
  year         = {{2026}},
}