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Chapter 8: GPS and a Real- T ime Situational Displa y 195
Figure 8.2 Beacon test area.
travels nominally at 1100 feet/s (second) in air, a 5-second delay would represent a
5500-ft distance. The receiver must then be located somewhere on a 5500-ft radius
sphere that is centered on B1. Figure 8.3 illustrates this abstraction in a graphical
representation taken from a Mathworks Matlab application.
• B2 flashes next. Suppose it takes 4 seconds for the B2 sound pulse to reach the GPS
receiver. This delay represents a 4400-ft sphere centered on B2. The B1 sphere and B2
sphere are shown intersecting in Figure 8.4. The heavily dashed line represents the
Figure 8.3 One sphere.
