Proceedings ArticleDOI
Adaptive nulling and spatial spectral estimation using an iterated principal components decomposition
D.O. Carhoun
- pp 3309-3312
TLDR
An iterative algorithm for computing a reduced-rank principal component least squares estimate of the adaptive weight vector to be used for spatially nulling interference received in the sidelobes of the formed beams of an array of antenna elements is described.Abstract:
An iterative algorithm for computing a reduced-rank principal component least squares estimate of the adaptive weight vector to be used for spatially nulling interference received in the sidelobes of the formed beams of an array of antenna elements is described. Based on a power/deflation method for extraction estimates of the dominant eigenstructure components, the algorithm is used to approximate the subspace spanned by the sample covariance eigenvectors associated with the directions of arrival of spatially coherent interference. Side information that can aid the discrimination between interference and noise subspaces is also produced. Performance is illustrated by the results of processing signals recorded from the individual elements of a linear antenna array operating in the HF band. >read more
Citations
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Journal ArticleDOI
RFI suppression for ultra wideband radar
TL;DR: An estimate-and-subtract algorithm is presented for the real-time digital suppression of radio frequency interference in ultrawideband (UWB) synthetic aperture radar (SAR) systems used for foliage- and ground-penetrating imaging, thereby reducing target energy loss and sidelobe levels in SAR imagery.
Journal ArticleDOI
Efficient and Robust RFI Extraction Via Sparse Recovery
Lam H. Nguyen,Trac D. Tran +1 more
TL;DR: This paper presents a simple adaptive framework for robust separation and extraction of multiple sources of radio-frequency interference (RFI) from raw ultra-wideband (UWB) radar signals in challenging bandwidth management environments.
Journal ArticleDOI
RFI Mitigation for UWB Radar Via Hyperparameter-Free Sparse SPICE Methods
TL;DR: A modified group SPICE algorithm is devised and it is proved that it is equivalent to a special case of the -PLAD method and can be applied to data from a coherent processing interval for effective RFI mitigation.
Journal ArticleDOI
A direction‐sensitive model of atmospheric noise and its application to the analysis of HF receiving antennas
TL;DR: In this article, the authors combined global maps of lightning occurrence with ray tracing propagation calculations to form a direction-sensitive model of atmospheric noise, which suggests a very complex directional behavior that can vary strongly with location, time, season, sunspot number, and frequency.
Proceedings ArticleDOI
RFI Mitigation for One-Bit UWB Radar Systems
TL;DR: This paper considers RFI mitigation for a one-bit UWB radar system, with its measurements obtained via a low-cost and high-rate sampling strategy using a known threshold varying with slow-time.
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