Figure 21
On the left, the line graph is labeled “(a)”. The vertical axis, labeled “Error percentage”, ranges from 0 to 30 percent in increments of 5 percent. The horizontal axis, labeled “Distance in meters”, ranges from 5 to 50 meters in increments of 5 meters. A single solid line begins at (8, 29.497), decreases steeply to (18, 1.812), rises gently to (25, 3.624), decreases again to (40, 2.012), and ends at (49, 3.636). On the right, the line graph is labeled “(b)”. The vertical axis, labeled “Error in meters”, ranges from 0 to 2.5 meters in increments of 0.5 meters. The horizontal axis, labeled “Distance in meters”, ranges from 5 to 50 meters in increments of 5 meters. A single solid line begins at (9, 2.037), decreases sharply to (19, 0.149), increases to (30, 0.708), decreases again to (40, 0.149), and ends at (49, 1.163). Note: All numerical data values are approximated.The trend of (a) percentage error and (b) absolute error, calculated from the difference between radar and GPS sensors during Test 1 in the along-track modality