The Global Positioning System A Shared National Asset (1995) / Chapter Skim
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Pages 72-77
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From page 72... ...
SPS receivers can eliminate the effects of SA through the use of local or w~de-area DGPS broadcasts of differential corrections. DGPS reference stations typically broadcast observed range and range-rate errors.
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Figure 3-1 DGPS coverage provided by commercially available systems, including Skyfix and Sercel. (Courtesy of the National Air Intelligence Center)
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Figure 3-2 DGPS coverage provided by the planned FAA WAAS (Wide-Area Augmentation System)
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Local-area DGPS reference stations are small and can be installed in less than an hour. Signals from such systems are difficult to detect because they can be broadcast at low power and at spread-spectrum frequencies or in rapid on/off cycles, with very short transmission times.
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