A Maximum Likelihood HF Direction Finding Estimator for High Latitude Distributed Signals

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Authors
  1. Read, W.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
This report details the development and evaluation of a new direction finding estimator, the Spread Maximum Likelihood algorithm, targeted for high latitude HF propagation conditions. Of particular concern are patches of enhanced electron density and associated instabilities in the ionosphere which drift across the polar cap during darkness causing scattering of the propagated signal over a range of azimuth and elevation directions (the signals are spatially spread). The new estimator incorporates a spatial spreading model allowing it to simultaneously deal with both patch scattered signals and signals propagated by more normal propagation mechanisms, as well as to distinguish between the two types. Evaluation of the new estimator using both simulation and collected data show it to be considerably superior to both conventional and modern superresolution approaches for high latitude propagation conditions.
Keywords
Bearing estimation;N-Channel;High latitudes;Maximum Likelihood Method;Northern regions;HF direction finding;MUSIC;High latitude HF radio propagation
Report Number
DREO-TR-1999-085 — Technical Report
Date of publication
01 Apr 1999
Number of Pages
100
DSTKIM No
CA000105
CANDIS No
512114
Format(s):
Hardcopy;Document Image stored on Optical Disk

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