A Comprehensive Investigation of Advanced Range Telemetry

Abstract

Data from ARTM channel sounding flights has been analyzed. A three-path model consisting of a line-of-sight path and two reflected paths adequately captures all the essential multipath features of the aeronautical telemetry channel. The amplitudes and delays of the multipath reflections are the same for L-Band and S-Band. Antenna diameter does have an effect: larger antenna diameters result in lower amplitudes on the short-delay multipath reflection. Flight 18 data demonstrated a great deal of spatial diversity for two antennas with 40-foot vertical separation. An analysis of the effects of multipath on the bit error rate for BPSK matches measurements taken during the channel sounding flights. The dynamic behavior of the channel is measured using the Doppler power spectrum which have a bandwidth of about 10 Hz. Thus the coherence time of the channel is approximately 100 ms.

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Document Details

Document Type
Technical Report
Publication Date
Nov 30, 1999
Accession Number
ADA396785

Entities

People

  • Michael Rice

Organizations

  • Brigham Young University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aircrafts
  • Altitude
  • Amplitude
  • Bandwidth
  • Carrier Frequencies
  • Diameters
  • Doppler Effect
  • Frequency
  • Frequency Bands
  • Frequency Shift
  • Geometry
  • L Band
  • Line Of Sight
  • Power Spectra
  • Spectra
  • Telemetry
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Radar Systems Engineering.
  • Radio communications and signal processing.