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for then <strong>be</strong>ams is therefore 3, 5 and 9 for the lZO, 20° and 3V c-, respectively.<br />
The num<strong>be</strong>r <strong>of</strong> deetiw rsnge elk, m, is 4.<br />
4.6.6 Processing<br />
The output hom the data reduction step was processed for ortor nureots using the<br />
three region sizes dehed in the prwious mtion. The central position <strong>of</strong> tbs region<br />
coincided with the position where a drifter estimate computed. Hence, for each<br />
drifter position used in the cornpaikon. 12,213 and 36 input data points were awilable<br />
for the regreion algorithm. Each <strong>of</strong> the points, which comprised the sectors, also<br />
had to meet the SNR criteria <strong>of</strong> at least <strong>10</strong> dB to <strong>be</strong> considered as valid. If this<br />
resalted in any missing data points in a seetor, or 'holes', which did not meet the<br />
SNR criteria, the estimate computd from the sector was not used in the comparison.<br />
A regression analysis arss then applied to the drifter and radar computed current<br />
components in order to study the correlation <strong>be</strong>tween the two estimates.