Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991tdar.nasa..132z&link_type=abstract
In its The Telecommunications and Data Acquisition Report p 132-140 (SEE N92-14237 05-32)
Astronomy and Astrophysics
Astronomy
Fast Fourier Transformations, Fixed Point Arithmetic, Preprocessing, Project Seti, Real Time Operation, Spectrum Analysis, Very Large Scale Integration, Algorithms, Bandwidth, Computerized Simulation, Low Cost, Radio Astronomy, Sky Surveys (Astronomy)
Scientific paper
A polyphase fast Fourier transform (FFT) spectrum analyzer being designed for NASA's Search for Extraterrestrial Intelligence (SETI) Sky Survey at the Jet Propulsion Laboratory is described. By replacing the time domain multiplicative window preprocessing with polyphase filter processing, much of the processing loss of windowed FFTs can be eliminated. Polyphase coefficient memory costs are minimized by effective use of run length compression. Finite word length effects are analyzed, producing a balanced system with 8 bit inputs, 16 bit fixed point polyphase arithmetic, and 24 bit fixed point FFT arithmetic. Fixed point renormalization midway through the computation is seen to be naturally accommodated by the matrix FFT algorithm proposed. Simulation results validate the finite word length arithmetic analysis and the renormalization technique.
Charny B.
Garyantes M. F.
Grimm M. J.
Zimmerman G. A.
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