Global Positioning System Reference
In-Depth Information
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19 July 2004, 0000Z -2359Z
GPS OCS monitor station -- Kaena Point, Hawaii
FAA NSTB reference station -- Honolulu, Hawaii
Stations are approximately 43 kilometers apart
18
RMS 3D AIV position
Error -- OCS MS:
2.9 meters
RMS 3D 4-SV position
Error -- OCS MS:
4.1 meters
RMS 3D 4-SV position
Error -- NSTB RS:
4.8 meters (raw)
4.3 meters (filtered)
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14
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10
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6
4
2
0
0
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4
6
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24
Time of day (UTC)
Best 4-SV 3D position error -- Hawaii NSTB RS, based on
raw dual-frequency SPS measurements
Best 4-SV 3D position error -- Hawaii NSTB RS, based on
filtered position error measurements
Best 4-SV 3D position error -- OCS Hawaii MS, based on
PPS observed range deviations (ORDs)
AIV 3D position error -- OCS Hawaii MS, based on PPS
observed range deviations (ORDs)
ANALYSIS NOTES
- Best four-satellite position solution with 5-degree mask angle
computed every minute over 24 hours.
- Raw dual-frequency PR residuals generated for each satellite
tracked at the reference station, with clock removed prior to
inputing
- GPS OCS ORDs are generated from raw measurements every
15 minutes. Interpolation is used to generate 1-minute samples
for input to position solution. Noise injected to emulate specific
user receiver.
Figure 7.29 Contrast between performance measurements from the FAA NSTB Hawaii reference
station and the GPS CS Hawaii monitor station.
Core performance paradigm: global in nature, includes all of the parameters
associated with the design of the core GPS program, lowest correlation with
individual user performance, provides the mechanisms for effects-based sus-
tainment and operations of the GPS constellation;
Regional performance paradigm: tailored to a specified user category for any
area of interest, supports performance monitoring for a specific application
within a region such as general aviation across the U.S. national airspace,
often used to support performance predictions for military planning;
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