THE DEPENDENCE OF HF DIRECTION FINDING ACCURACY ON APERTURE SIZE

Authors
  1. Montbriand, L.E.
Corporate Authors
Communications Research Centre, Ottawa ONT (CAN)
Abstract
A 1943 m by 236 m crossed linear array located at Ottawa was used to investigate the relationships between direction finding accuracy, wavefront planarity, and aperture size. Two tests were carried out: Test A: transmissions from Sept Iles, Quebec to Ottawa (a 911 km path), and Test B: from San Antonio, Texas to Ottawa (2654 km path). An FMCW sounding technique was employed which made it possible to resolve modes differing in time of arrival by as little as 20 mus. The data for the long arm of the array were processed in sub-sets so as to provide results for 9 different aperture sizes. Three basic comparisons were made. The first concerned the relationship of apparent wavefront planarity to aperture size, where the measure of the planarity (RMSD) was the RMS of phase deviations from a straight line fit of phases along the array. TRUNCATED
Report Number
1343 —
Date of publication
15 Jun 1981
Number of Pages
28
DSTKIM No
82-00527
CANDIS No
35188
Format(s):
Hardcopy;Originator's fiche received by DSIS

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