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Polyphase-discrete fourier transform spectrum analysis for the search for extraterrestrial intelligence sky survey
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Gulkis, S. Zimmerman, G. A. |
| Copyright Year | 1991 |
| Description | The sensitivity of a matched filter-detection system to a finite-duration continuous wave (CW) tone is compared with the sensitivities of a windowed discrete Fourier transform (DFT) system and an ideal bandpass filter-bank system. These comparisons are made in the context of the NASA Search for Extraterrestrial Intelligence (SETI) microwave observing project (MOP) sky survey. A review of the theory of polyphase-DFT filter banks and its relationship to the well-known windowed-DFT process is presented. The polyphase-DFT system approximates the ideal bandpass filter bank by using as few as eight filter taps per polyphase branch. An improvement in sensitivity of approx. 3 dB over a windowed-DFT system can be obtained by using the polyphase-DFT approach. Sidelobe rejection of the polyphase-DFT system is vastly superior to the windowed-DFT system, thereby improving its performance in the presence of radio frequency interference (RFI). |
| File Size | 720486 |
| Page Count | 14 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19920005033 |
| Archival Resource Key | ark:/13960/t78s9n43n |
| Language | English |
| Publisher Date | 1991-11-15 |
| Access Restriction | Open |
| Subject Keyword | Space Biology Matched Filters Sensitivity Fourier Transformation Low Pass Filters Comparison Spectrum Analysis Bandpass Filters Continuous Radiation Sky Surveys Astronomy Project Seti Signal Detection Microwaves Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
