A SIMULATION STUDY OF HF DIRECTION FINDING IN THE PRESENCE OF A F-REGION SCATTERING AND SPORADIC-E

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Authors
  1. Jenkins, R.W.
Corporate Authors
Communications Research Centre, Ottawa ONT (CAN);Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
An HF direction finding (DF) system employing sampled-aperture techniques on high-latitude signals is simulated. The propagation is treated as scatter from moving patches of field-aligned F-region irregularities modelled as vertical "thin-wire" scatterers in a horizontally stratified ionosphere, plus a weak sporadic-E (Es) reflection from a horizontal mirror-like surface. The resultant simulated received signals are analyzed by plane wave fitting and multiple-signal classification (MUSIC) DF algorithms. Simulations of DF operations on scattered signals, using system parameters similar to those used for actual high-latitude observations, reveal results similar to those observed. The observed directions reflect the locations of the scattering patches rather than the transmitter. The detection of a patch depends strongly on its location, the radio frequency, and the ionospheric parameters. When a patch is seen, the time history of estimated directions indicated its width, well as its location. MUSIC provides a picture of the width and number of scattering patches present in a short time. TRUNCATED
Keywords
Computerized simulation;High-latitude ionosphere
Report Number
CRC-TN-93-004 — Technical Note
Date of publication
01 Jan 1994
Number of Pages
62
DSTKIM No
95-02232
CANDIS No
149362
Format(s):
Document Image stored on Optical Disk;Hardcopy

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