Using sources of opportunity to compensate for receiver mismatch in HF arrays

Fabrizio, G.A.; Gray, Douglas A.; Turley, M.D.

doi:10.1109/7.913693

Cited by 7 publications

(2 citation statements)

References 5 publications

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“…Cost-effective and real-time array calibration methods for phased-array HF radars have received significant attention in the past several years. For example, Fabrizio et al developed an adaptive algorithm that estimates the receiver frequency response corrections for HF radar arrays [24]. Later, a maximum-likelihood (ML)-based phase error calibration method in which sea echoes are regarded as disparate sources was developed for the Ocean State Monitor and Analysis Radar (OSMAR) [25].…”

Section: Introductionmentioning

confidence: 99%

Validation and Evaluation of a Ship Echo-Based Array Phase Manifold Calibration Method for HF Surface Wave Radar DOA Estimation and Current Measurement

Zhao

Chen

et al. 2020

Remote Sensing

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Shore-based phased-array HF radars have been widely used for remotely sensing ocean surface current, wave, and wind around the world. However, phase uncertainties, especially phase distortions, in receiving elements significantly degrade the performance of beam forming and direction-of-arrival (DOA) estimation for phased-array HF radar. To address this problem, the conventional array signal model is modified by adding a direction-based phase error matrix. Subsequently, an array phase manifold calibration method using antenna responses of incoming ship echoes is proposed. Later, an assessment on the proposed array calibration method is made based on the DOA estimations and current measurements that are obtained from the datasets that were collected with a multi-frequency HF (MHF) radar. MHF radar-estimated DOAs using three calibration strategies are compared with the ship directions that are provided by an Automatic Identification System (AIS). Additionally, comparisons between the MHF radar-derived currents while using three calibration strategies and Acoustic Doppler Current Profilers (ADCP)-measured currents are made. The results indicate that the proposed array calibration method is effective in DOA estimation and current measurement for phased-array HF radars, especially in the phase distortion situation.

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Section: Introductionmentioning

confidence: 99%

Validation and Evaluation of a Ship Echo-Based Array Phase Manifold Calibration Method for HF Surface Wave Radar DOA Estimation and Current Measurement

Zhao

Chen

et al. 2020

Remote Sensing

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“…The antenna position errors can also be neglected as the positions can be easily and accurately measured in such a small‐aperture array considered here. Lots of research work has been put forward in calibration of array errors, including use of known and unknown sources [10–15]. The use of known signals incident from the far field (e.g.…”

Section: Introductionmentioning

confidence: 99%

Calibration of antenna pattern and phase errors of a cross‐loop/monopole antenna array in high‐frequency surface wave radars

Zhou

Wen

2014

IET Radar, Sonar & Navigation

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High-frequency surface wave radar has now been widely used as a regular instrument in remote sensing of sea states. To solve the contradiction of the array pattern beamwidth and array aperture, multiple cross-loop/monopole (CM) antennas are used as sub-arrays to form a uniform linear array, which is called the CM-uniform linear array (ULA). Adaptive beamforming via virtual interferences is used to synthesize the desired pattern and a half beamwidth of about 20°is achieved by a two-unit CM-ULA with a spacing of 0.75λ (λ is the radar wavelength). A novel iterative method is proposed to calibrate the array errors, including the individual antenna pattern distortions and the channel gain/phase errors, without resorting to any known signals such as a beacon or transponder signal. Simulations are executed and the results show the validity of the proposed method.

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Impact of Mutual-Coupling in HF-band Uniform Linear Receiving Arrays

Frazer¹,

Williams²

2022

2022 IEEE International Symposium on Phased Array Systems &Amp; Technology (PAST)

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Using sources of opportunity to compensate for receiver mismatch in HF arrays

Cited by 7 publications

References 5 publications

Validation and Evaluation of a Ship Echo-Based Array Phase Manifold Calibration Method for HF Surface Wave Radar DOA Estimation and Current Measurement

Validation and Evaluation of a Ship Echo-Based Array Phase Manifold Calibration Method for HF Surface Wave Radar DOA Estimation and Current Measurement

Calibration of antenna pattern and phase errors of a cross‐loop/monopole antenna array in high‐frequency surface wave radars

Impact of Mutual-Coupling in HF-band Uniform Linear Receiving Arrays

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