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This corresponds to about 500 km between reflection points for Beams 0 and 15.
The prediction of the reflection points for this experiment is shown in Figure 10.
Figure 1 shows the approximate location of the ionospheric reflection points for the SuperDARN Hokkaido radar (red circles).
Figure 3 shows the reflection points for satellites PRN 15 and PRN 18 for elevations below 30°.
These satellites were chosen among the available GPS satellites of the constellation because their azimuth angle tracks were close to the axis of the receiving antenna's main beam center of 110°. Figure 3 Multipath reflection points for GPS satellites recorded at the measurement site.
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Fig. 4 Simulated phase shift (top), elevation (middle) and virtual height (bottom) variations vs group range for the reflection points of ground scatter in Fig. 3.
The yellow contour shows "reflection" point locations for the Pedersen and the low-angle rays.
This configuration can be easily extended to support two different front ends, one of them connected to an up-looking RH antenna, in order to allow the collection also of the direct GPS signals for positioning purposes and for georeferencing specular reflection points into the terrain.
The upper limit is determined from the spacing between reflection points, increasing the uncertainty in velocity for events with velocities higher than this limit.
Figure 9 Moving measurement setup for experiment B. Figure 10 Experiment B: Prediction of reflection points on ( x, y ) plane.
Concretely, we check, for each reflection point, if the angle of reflection θr equals the angle of incidence θ i, as shown in Figure 3.
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