THE EFFECTS OF ANTENNA ARRAY GEOMETRY AND ELEMENT PATTERN UNCERTAINTY ON HIGH-LATITUDE HF DIRECTION FINDING

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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
Simulation studies are described which model the performance of a sampled-aperture HF direction-finding (DF) system operating with specified array geometries in the presence of both single-reflection (point-source) and multiple reflection/scattering (extended-source) ionospheric radio propagation typical of observed high-latitude nighttime conditions. A multiple-direction estimator was used to obtain direction estimates; the deterministic maximum-likelihood algorithm was selected for this, following a comparison between it and the MUSIC algorithm. Array pattern errors, based on previous phase and amplitude pattern measurements and numerical modelling, were included in the simulation. The performance is characterised in terms of the ability of the DF system to see a weaker point source in the presence of the extended source. The array apertures in wavelengths (or alternatively operating frequencies for a fixed-size array) over which good performance was obtained was limited at the low end by the resolving power of the array, and at the high end by the narrow array beamwidth and the limited number of directions available to the DF algorithm to describe the situation. Pattern errors reduced performance significantly; much more at small array apertures (2.5 wavelengths or less) than at larger apertures (5 wavelengths or more). TRUNCATED
Keywords
Antenna Pattern Errors;High Latitudes
Report Number
CRC-97-006;DREO-97-344 —
Date of publication
01 Dec 1997
Number of Pages
40
DSTKIM No
98-00603
CANDIS No
507429
Format(s):
Hardcopy;Document Image stored on Optical Disk

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