total of 10 pages only may be xeroxed - Memorial University's Digital ...
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Chapter 2<br />
Technique<br />
2.1 Introduction<br />
The radar coverage zone he partitioned into a polar grid <strong>of</strong> radar scattering<br />
cells, eaeh <strong>of</strong> which 1s specified by the radar's range and azimuthal mlution. A HF<br />
Doppler spectrum from each <strong>of</strong> these ceb is charmterized by two dominant pe&<br />
spaced symmetrically about the carrier. The frequencies <strong>of</strong> these peeks are used by all<br />
HF GWRwtems for the m-uement <strong>of</strong> ocean surface m t s since they indirectly<br />
trace the underlying average surfme -rent component. These camponents, or radial<br />
current projections, can hs estimated for all eeUs in the radar ewerage zone to yeld<br />
a grid d the radial current field. How these datagrids are generated will <strong>be</strong> discussed<br />
m the following sections.<br />
For the estimation <strong>of</strong> wetor currents, a technique will he presented which as-<br />
sumes that the current is uniform about the estimation point. In this ease adjacent<br />
azimuthal radial current components will he different projections <strong>of</strong> this mrrent. A<br />
geometric linear equation descri<strong>be</strong>s this relationship for one radar cell. A <strong>be</strong>t <strong>of</strong> these<br />
equations can <strong>be</strong> generated for dl cells which fall within the assumed uniform c mnt<br />
ream. These equations can then he subjected to a linear regression analysis to yield<br />
an estimate <strong>of</strong> the vector current components.