Environmental/Noise Effects on VHF/UHF UWB SAR

Abstract

This paper presents a straightforward approach to estimating the impact of natural environmental noise on an overall system noise temperature for very high frequency/ultrahigh frequency synthetic aperture radar (VHF/UHF SAR), emphasizing the 30-600 MHz band. The most important external noise sources included are galactic noise, solar noise, and unintended man-made noise. In addition, the estimate of system noise temperature includes the effect of thermal noise due to ground and antenna losses as well as receiver noise. Atmospheric noise is generally much less than other sources in the band of interest here and so has not been specifically included. Similarly, thermal noise originating in atmospheric absorption losses is not significant in this band. We consider first the contributions of various sources to an overall sky temperature and then a model for estimating the effect of sky temperature on the system noise temperature of a practical, non-ideal, radar receiver.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1998
Accession Number
ADA359931

Entities

People

  • James Heagy
  • James Ralston
  • Roger Sullivan

Organizations

  • Institute for Defense Analyses

Tags

Communities of Interest

  • Air Platforms
  • Autonomy

DTIC Thesaurus Topics

  • Absorption
  • Atmospheric Attenuation
  • Bandwidth
  • Frequency
  • Frequency Bands
  • Losses
  • Radar
  • Radar Equipment
  • Radar Receivers
  • Radiation
  • Radio Frequency
  • Radio Frequency Interference
  • Reflectance
  • Solar Activity
  • Synthetic Aperture Radar
  • Ultrahigh Frequency
  • Very High Frequency

Readers

  • Acoustics.
  • Radar Systems Engineering.