Modification of a high frequency radar echo spatial correlation function by propagation in a linear plasma density profile

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Authors
  1. Riddolls, R.J.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
This memorandum examines the spatial autocorrelation function for echoes from an ionospheric plasma in the High Frequency (HF) range. Conventional treatments of this problem assume that the amount of signal phase shift for a given plasma density fluctuation in the ionospheric propagation medium remains constant along the propagation path. For HF radar signal propagation through an ionospheric plasma with field-aligned density structures, the spatial phase autocorrelation is predicted to be highly anisotropic, with essentially perfect correlation in the magnetic north- south direction. In this memorandum a revised theory is provided that accounts for a spatial-dependent derivative of signal wavenumber with respect to plasma density in an ionosphere with a linear plasma density profile. This revised theory leads to a prediction of a far more isotropic autocorrelation, with an axial ratio equal to the cosecant of the local magnetic dip angle. This theory provides a more realistic basis for predicting the performance of spatial adaptive antenna arrays for the rejection of vertical incidence ionospheric clutter in HF Surface Wave Radar (HFSWR) systems.

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Report Number
DRDC-OTTAWA-TM-2011-219 — Technical Memorandum
Date of publication
01 Nov 2011
Number of Pages
30
DSTKIM No
CA036921
CANDIS No
536584
Format(s):
Electronic Document(PDF)

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