Figure 4: Modernization Milestone

FIGURE 4: The L5 spectrum of GPS SVN 49 satellite, captured at 5:40 a.m. PDT on April 11, 2009, at Stanford, California. Satellite elevation was 74 degrees and azimuth was 249 degrees. The satellite elevation is identical to that in Figure 3, to ensure that the antenna pattern and the received L5 signal power are the same. The Woodside DME was on. Clearly visible in the spike around -4 MHz is the DME signal captured through a side lobe of the 1.8-meter parabolic antenna gain pattern.