Broadband Beamforming of Focal Plane Array (FPA) Signals Using Real-Time Spatio-Temporal 3D FIR Frustum Digital Filters

Autor:	L.T. Bruton, T.K. Gunaratne, P Agathoklis
Rok vydání:	2011
Předmět:	Beamforming Physics Frustum business.industry Filter (signal processing) Noise Optics Band-pass filter Distortion Electrical and Electronic Engineering business Digital filter Passband Computer Science::Information Theory
Zdroj:	IEEE Transactions on Antennas and Propagation. 59:2029-2040
ISSN:	1558-2221 0018-926X
DOI:	10.1109/tap.2011.2122221
Popis:	A real-time spatio-temporal (ST) 3D FIR Frustum filter is proposed for improving the SNR of broadband focal plane array (FPA) signals. The 3D stop band of the proposed filter attenuates non-reflected off-dish signals, such as radio frequency interference (RFI), and also attenuates noise due to local thermal sources (e.g., ground) as well as receiver noise. The frustum-shaped 3D pass band transmits, with low distortion, desired broadband reflected celestial signals, as received by the focal plane array (FPA) of receiving elements. It is shown that, for pulsar-timing and pulsar-profile studies, the pre-processing of FPA signals using the proposed 3D ST Frustum filter-based beamforming method, prior to coherent de-dispersion, yields lower distortion than the 3D conjugate field matching (CFM) method (when appropriately extended from 2D to 3D) and also lower distortion than the conventional 2D spatial-only beamforming method.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a7be2d83bef44ac2715a4d7ad0ff21b5 https://doi.org/10.1109/tap.2011.2122221 Zobrazit plný text záznamu