Very High Frequency (VHF) and Ultrahigh Frequency (UHF) Band Sky Noise Estimates From Analysis of 34.5 MHz and 408 MHz Sky Surveys
Abstract
Ultrawideband (UWB) radars operating in the UHF and VHF frequency bands, 30,000 MHz, are subject to a variety of environmental noise sources (non-man-made sources). Chief among these are strong radio emitting astronomical sources, notably the center of the Milky Way galaxy and supernova remnants. Two recent radio sky surveys, one at 408 MHz and the other at 34.5 MHz, are analyzed to evaluate the impact of radio sky noise on the performance of UWB radars. To this end, sky temperatures are estimated throughout the 301,000 MHz range for a hypothetical radar with a 300 beam half-width. Effective temperatures are also estimated for evaluating system temperatures for a spot receiver operating in the 40-400 MHz band and a UWB synthetic aperture radar (SAR) operating in the 30-100 MHz band.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1998
- Accession Number
- ADA350931
Entities
People
- James F. Heagy
- James M. Ralston
- Joel Iams
Organizations
- Institute for Defense Analyses