2 research outputs found
Digital Prototype Filter Alternatives for Processing Frequency-Stacked Mobile Subbands Deploying a Single ADC for Beamforming Satellites
This article presents a two-stage approach for the processing of
frequency-stacked mobile subbands. The frequency stacking is performed in the
analog domain to enable the use of a wideband analog-to-digital converter
(ADC), instead of employing multiple narrowband ADCs, to support multiple
antenna elements for digital satellite beamforming. This analog front end
provides a common broadband digital interface to the on-board processor and can
be configured to support multiple satellite missions, reducing the cost of
commissioning a digital processor for individual satellite missions. This
article proposes a framework on the specification of digital prototype filter
for the analysis of frequency-stacked mobile subbands. The computational
complexity of the analysis operation, with two digital filter alternatives, are
evaluated. A series of results, taken from our European Space Agency sponsored
project, are presented here to demonstrate the applicability of the proposed
two stage approach, reporting on the savings in power consumption when an
Nth-band all-pass-based recursive filter having an infinite impulse response is
used as the digital prototype filter
Abstracts on Radio Direction Finding (1899 - 1995)
The files on this record represent the various databases that originally composed the CD-ROM issue of "Abstracts on Radio Direction Finding" database, which is now part of the Dudley Knox Library's Abstracts and Selected Full Text Documents on Radio Direction Finding (1899 - 1995) Collection. (See Calhoun record https://calhoun.nps.edu/handle/10945/57364 for further information on this collection and the bibliography).
Due to issues of technological obsolescence preventing current and future audiences from accessing the bibliography, DKL exported and converted into the three files on this record the various databases contained in the CD-ROM.
The contents of these files are:
1) RDFA_CompleteBibliography_xls.zip [RDFA_CompleteBibliography.xls: Metadata for the complete bibliography, in Excel 97-2003 Workbook format; RDFA_Glossary.xls: Glossary of terms, in Excel 97-2003 Workbookformat; RDFA_Biographies.xls: Biographies of leading figures, in Excel 97-2003 Workbook format];
2) RDFA_CompleteBibliography_csv.zip [RDFA_CompleteBibliography.TXT: Metadata for the complete bibliography, in CSV format; RDFA_Glossary.TXT: Glossary of terms, in CSV format; RDFA_Biographies.TXT: Biographies of leading figures, in CSV format];
3) RDFA_CompleteBibliography.pdf: A human readable display of the bibliographic data, as a means of double-checking any possible deviations due to conversion