3-D IIR filtering using decimated DFT-polyphase filter bank structures

Kuenzle, Bernhard; Bruton, L.T.

doi:10.1109/tcsi.2005.856663

Cited by 23 publications

(4 citation statements)

References 27 publications

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“…In previous work [9]- [12], the axis of the passband of cone filer banks may be oriented to point at the DOA. However, for radio astronomy applications having the requirement that the passband be circularly symmetric around the temporal frequency axis, a relatively simple 3-D cone filter bank architecture is described (first proposed in [14] and consisting of 1-D FIR filters and 2-D circularly symmetric FIR filters).…”

Section: Space-time Digital Filtering Of Radio Astronomical Signals Umentioning

confidence: 99%

Space-Time Digital Filtering of Radio Astronomical Signals using 3-D Cone Filters

Liyanage¹,

Bruton²,

Agathoklis³

et al. 2010

Proceedings of RFI Mitigation Workshop — PoS(RFI2010)

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In this paper, 3-D space-time (ST) processing is proposed as a technique to enhance signals of interest (SOIs) by attenuating near-over-the-horizon radio frequency interferences (RFIs) that exist on dense phased arrays used in the next generation of radio telescopes. The proposed approach is based on the difference between the regions of support (ROSs) in the 3-D frequency domain of the Fourier transforms of the SOIs and RFIs. A 3-D linear phase filter bank structure, consisting of 1-D FIR filters and 2-D circularly symmetric FIR filters, is employed to suppress the RFIs. The performance of the proposed 3-D ST filtering approach is illustrated using synthesized broadband (BB) SOIs and BB RFIs on dense aperture arrays (DAAs) and on focal plane arrays (FPAs). Results are presented that indicate the potential for successful mitigation of near-over-the-horizon BB RFIs without significantly distorting the BB SOIs. The advantage of the proposed ST filtering approach is its inherent capability of BB processing. RFI mitigation workshop

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Section: Space-time Digital Filtering Of Radio Astronomical Signals Umentioning

confidence: 99%

Space-Time Digital Filtering of Radio Astronomical Signals using 3-D Cone Filters

Liyanage¹,

Bruton²,

Agathoklis³

et al. 2010

Proceedings of RFI Mitigation Workshop — PoS(RFI2010)

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“…It is typically required, by subsequent beamforming operations, that the 3D cone filter have a linear phase transfer function. The 3D cone filters that proposed in [11][12] [13] do not have a linear phase transfer function and are therefore not used here.…”

Section: Broadband Mutually-coupled St Signals On the Antenna Arraymentioning

confidence: 99%

On the attenuation of interference and mutual coupling in antenna arrays using 3D space-time filters

Liyanage

Bruton

Agathoklis

2009

2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

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A 3D space-time filtering method is proposed for attenuating undesirable electromagnetic signals that propagate at or close to light speed across the surface of the plane that contains an array of antennas. Such signals may include the so-called radio frequency interference (RFI) that emanate from sources that lie well outside the directions of arrival (DOAs) of the signals of interest (SOIs). They may also include the intra-plane inter-antenna signals that result from the undesirable electromagnetic mutual coupling that exists between rectangularly-spaced antennas in aperture arrays (AAs) and in the focal plane arrays (FPAs) of paraboloidal dishes. Such signals have 3D space-time spectra possessing regions of support (ROSs) that are close to the surface of the 3D spectral light cone. They can therefore be attenuated by means of 3D space-time filters having 3D stopbands that include and encompass the surface of this light cone. Such a 3D space-time filter is described here and used to evaluate the validity of the proposed approach. Numerical results confirm that the proposed method significantly attenuates broadband RFI signals and moderately suppresses mutual coupling.

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“…Three-dimensional (3-D) filters provide a convenient mechanism for the integration of the spatial and temporal axes into a coherent framework and offer a wide range of design alternatives 9 finite impulse response (FIR) or infinite impulse response (IIR), recursive or non recursive, with nominal pass-bands of arbitrary shape (e.g. plane, beam, wedge/fan 9,10,11 , pyramid 12 , cone 13 , donut 14 , etc.). While these filters have proven to be very effective in novel imaging, audio/acoustic and radio-frequency applications 9 , they offer rapidly diminishing returns when they are applied to the problem of foreground enhancement and background cancellation in infrared sensors, because typical scenes of interest are highly non-stationary, due to object edges/boundaries for instance.…”

Section: Introductionmentioning

confidence: 99%

Multidimensional digital filters for point-target detection in cluttered infrared scenes

Kennedy

2014

J. Electron. Imaging

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A 3-D spatiotemporal prediction-error filter (PEF), is used to enhance foreground/background contrast in (real and simulated) sensor image sequences. Relative velocity is utilized to extract point-targets that would otherwise be indistinguishable on spatial frequency alone. An optical-flow field is generated using local estimates of the 3-D autocorrelation function via the application of the fast Fourier transform (FFT) and inverse FFT. Velocity estimates are then used to 'tune in' a background-whitening PEF that is matched to the motion and texture of the local background. Finite-impulse-response (FIR) filters are designed and implemented in the frequency domain. An analytical expression for the frequency response of velocity-tuned FIR filters, of odd or even dimension, with an arbitrary 'delay' in each dimension, is derived.

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3-D IIR filtering using decimated DFT-polyphase filter bank structures

Abstract: Kuenzle, Bernhard Kuenzle, B. (2005). 3D IIR filtering using decimated DFT-polyphase filter bank structures (Unpublished master's thesis).

Cited by 23 publications

References 27 publications

Space-Time Digital Filtering of Radio Astronomical Signals using 3-D Cone Filters

Space-Time Digital Filtering of Radio Astronomical Signals using 3-D Cone Filters

On the attenuation of interference and mutual coupling in antenna arrays using 3D space-time filters

Multidimensional digital filters for point-target detection in cluttered infrared scenes

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