Investigation of Doppler Features From Wind Turbine Scattering

Naqvi, Aale; Yang, Shi-Nine; Líu, Hao

doi:10.1109/lawp.2010.2050672

Cited by 59 publications

(28 citation statements)

References 4 publications

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“…Numerous studies have characterized wind turbine RF scattering behavior, either in isolation or in a farm [25,26,27,28,29,30,31,32,33,34,35,36]. Due to the significant effort required to measure a structure as large as a wind turbine while calibrating for outdoor effects (interfering RF signals, wind speed and direction, etc.…”

Section: Radar-windfarm Interactionmentioning

confidence: 99%

“…), several of these studies are restricted to simulated results. An alternative approach to full-scale measurement is measuring a scaled turbine at higher frequency in a controlled anechoic chamber [28,35], assuming the high frequency radar signature of a miniaturized turbine mimics that of an actual turbine at low frequency. This is a valid assumption if material properties are stable over frequency, and it appears that turbine RF scattering shows similar behavior at both low and high frequencies.…”

Section: Radar-windfarm Interactionmentioning

confidence: 99%

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Radar-cross-section reduction of wind turbines. part 1.

Brock¹,

Loui²,

McDonald³

et al. 2012

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In recent years, increasing deployment of large wind-turbine farms has become an issue of growing concern for the radar community. The large radar cross section (RCS) presented by wind turbines interferes with radar operation, and the Doppler shift caused by blade rotation causes problems identifying and tracking moving targets. Each new wind-turbine farm installation must be carefully evaluated for potential disruption of radar operation for air defense, air traffic control, weather sensing, and other applications. Several approaches currently exist to minimize conflict between wind-turbine farms and radar installations, including procedural adjustroents, radar upgrades, and proper choice of low-impact wind-farm sites, but each has problems with limited effectiveness or prohibitive cost. An alternative approach, heretofore not techoically feasible, is to reduce the RCS of wind turbines to the extent that they can be installed near existing radar installations. This report summarizes efforts to reduce wind-turbine RCS, with a particular emphasis on the blades. The report begins with a survey of the wind-turbine RCS-reduction literature to establish a baseline for comparison. The following topics are then addressed: electromagnetic model development and validation, novel material development, integration into wind-turbine fabrication processes, integrated-absorber design, and wind-turbine RCS modeling. Related topics of interest, including alternative mitigation techoiques (procedural, at-the-radar, etc.), an introduction to RCS and electromagnetic scattering, and RCS-reduction modeling techniques, can be found in a previous report.

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Section: Radar-windfarm Interactionmentioning

confidence: 99%

Section: Radar-windfarm Interactionmentioning

confidence: 99%

Radar-cross-section reduction of wind turbines. part 1.

Brock¹,

Loui²,

McDonald³

et al. 2012

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show abstract

“…Significant research has been carried out to develop accurate and computationally efficient models of RCS [8][9][10][11][12][13][14], and to measure scaled models of turbines in controlled setups to investigate the effect of different yaw angles and rotation speeds on the resulting radar signature [15][16]. The performance of realistic radar systems affected by wind farm clutter has also been characterised, for example for the effectiveness of Ground Moving Target Indication (GMTI) algorithms for targets within the wind farm area [17], for the behaviour of weather radar stations [18][19][20], for maritime radar systems [21][22], and for the detection and tracking of unauthorised aircraft entering restricted zones [23].…”

Section: Introductionmentioning

confidence: 99%

Practical investigation of multiband mono‐ and bistatic radar signatures of wind turbines

Fioranelli¹,

Ritchie

Balleri

et al. 2017

IET Radar, Sonar & Navigation

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The negative effects wind farm clutter has on the performance of radar systems for Air Traffic Control and Air Surveillance is well-known in the radar research community and several mitigation techniques have been proposed to address this problem. These include bistatic and multistatic radar systems providing multiple views of the area under surveillance, and hence potential additional information that can be used to improve the receiver performance. This paper presents the analysis of a set of experimental data collected simultaneously by two radar systems, one operating at S-band and one at Xband, of echoes from an operational wind farm in the UK near Oxford. This analysis presents several parameters extracted from the time domain data and the Doppler spectra, such as Doppler centroid and bandwidth of the micro-Doppler signature as well as amplitude statistics of the time domain returns.These parameters are characterised using data recorded at monostatic and bistatic nodes, as well as at different polarisation combinations.

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“…Understanding the clutter features in detail is a necessary step towards developing mitigation techniques. A number of previous studies have reported the Doppler features of turbines in isolated as well as complex settings [8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Time-Frequency and Isar Characteristics of Wind Turbines With Higher Order Motions

Naqvi¹,

Líu²

2013

PIER

Self Cite

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Abstract-Radar features from higher order motions of a wind turbine undergoing rotation are studied. Mathematical models for the motions are proposed and used to simulate the joint time-frequency (JTF) and inverse synthetic radar aperture (ISAR) characteristics of the motions. The motions are studied for an isolated turbine as well as for a turbine rotating above a ground. Selected motions are corroborated by laboratory model measurements.

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Investigation of Doppler Features From Wind Turbine Scattering

Cited by 59 publications

References 4 publications

Radar-cross-section reduction of wind turbines. part 1.

Radar-cross-section reduction of wind turbines. part 1.

Practical investigation of multiband mono‐ and bistatic radar signatures of wind turbines

Time-Frequency and Isar Characteristics of Wind Turbines With Higher Order Motions

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