Target Doppler Rate Estimation Based on the Complex Phase of STFT in Passive Forward Scattering Radar

Karol Abratkiewicz , Piotr Krysik , Zbigniew Gajo , Piotr Jerzy Samczyński

Abstract

This article presents a novel approach to the estimation of motion parameters of objects in passive forward scattering radars (PFSR). In such systems, most frequency modulated signals which are used have parameters that depend on the geometry of a radar scene and an object’s motion. Worth noting is that in bistatic (or multistatic) radars forward scattering geometry is present thus in this case only Doppler measurements are available while the range measurement is unambiguous. In this article the modulation factor, also called the Doppler rate, was determined based on the chirp rate (equivalent Doppler rate) estimation concept in the time-frequency (TF) domain. This approach utilizes the idea of the complex phase of the short-time Fourier transform (STFT) and its modification known from the literature. Mathematical dependencies were implemented and verified and the simulation results were described. The accuracy of the considered estimators were also verified using the Cramer-Rao lower bound (CRLB) to which simulated data for the considered estimators was compared. The proposed method was validated using a real-life signal collected from a radar operating in PFSR geometry. The Doppler rate provided by a car crossing the baseline between the receiver and the GSM transmitter was estimated. Finally, the concept of using CR estimation, which in the case of PFSR can be understood as Doppler rate, was confirmed on the basis of both simulated and real-life data.
Author Karol Abratkiewicz (FEIT / PE)
Karol Abratkiewicz,,
- The Institute of Electronic Systems
, Piotr Krysik (FEIT / PE)
Piotr Krysik,,
- The Institute of Electronic Systems
, Zbigniew Gajo (FEIT / PE)
Zbigniew Gajo,,
- The Institute of Electronic Systems
, Piotr Jerzy Samczyński (FEIT / PE)
Piotr Jerzy Samczyński,,
- The Institute of Electronic Systems
Journal seriesSensors, [SENSORS-BASEL], ISSN 1424-8220, e-ISSN 1424-3210, (N/A 100 pkt)
Issue year2019
Vol19
No16
Pages1 - 13
Publication size in sheets181.35
Keywords in Englishpassive forward scattering radar; chirp rate estimation; passive radar; forward scattering radar; radar measurements; time-frequency analysis
ASJC Classification1303 Biochemistry; 1602 Analytical Chemistry; 2208 Electrical and Electronic Engineering; 3107 Atomic and Molecular Physics, and Optics
DOIDOI:10.3390/s19163627
URL https://www.mdpi.com/1424-8220/19/16/3627
Languageen angielski
File
sensors-19-03627-v2.pdf 6.22 MB
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 31-12-2019, ArticleFromJournal
Publication indicators Scopus Citations = 1; WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2016 = 1.393; WoS Impact Factor: 2018 = 3.031 (2) - 2018=3.302 (5)
Citation count*1 (2020-01-22)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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