RAIM fault detection availability determination

L3NAV Systems
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RAIM fault detection availability determination

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   RAIM FAULT DETECTION AVAILABILITY TEST SUMMARY

For Non-Precision Approach with All-In-View satellites:
- horizontal alarm limit (meters):   555.600
- GPS receiver mode: SPS with SA On
- almanac: svprime.dat
- number of satellites in constellation = 24
- number of locations:    24
- number of time samples:   48
- time increment (seconds):   1800
- std. dev. of pseudorange error (meters):   33.300
- elevation angle limit (degrees):   5.0000
- probability of false alarm: 6.6667000e-005
- probability of missed detection: 1.0000000e-003
- total space-time sample points:   1152

RAIM fault detection available   =   1129, percentage: 98.00347
RAIM fault detection unavailable =     23, percentage: 1.99653

Repartition of RAIM fault detection available/unavailable cases:
- when < 5 visible satellites:    0 available,    0 unavailable
- when   5 visible satellites:    0 available,    3 unavailable
- when   6 visible satellites:   33 available,   10 unavailable
- when   7 visible satellites: 310 available,   10 unavailable
- when   8 visible satellites: 441 available,    0 unavailable
- when   9 visible satellites: 276 available,    0 unavailable
- when 10 visible satellites:   64 available,    0 unavailable
- when 11 visible satellites:    5 available,    0 unavailable
- when 12 visible satellites:    0 available,    0 unavailable

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             SATELLITE VISIBILITY STATISICS

Number of cases with < 5 visible satellites =    0
Number of cases with   5 visible satellites =    3
Number of cases with   6 visible satellites =   43
Number of cases with   7 visible satellites = 320
Number of cases with   8 visible satellites = 441
Number of cases with   9 visible satellites = 276
Number of cases with 10 visible satellites =   64
Number of cases with 11 visible satellites =    5
Number of cases with 12 visible satellites =    0

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Figure 3-26.1. Fault detection availability statistics summary

Table 3-26. RAIM Fault detection availability
Phase of flight	pfa = 6.6667e-5, pmd = 0.001		pfa = 3.3333e-7, pmd = 0.001
Phase of flight	SA On (std. dev. = 33.3 m)	SA Off (std. dev. = 6.5 m)	SA On (std. dev. = 33.3 m)	SA Off (std. dev. = 6.5 m)
Non-Precision Approach	98.003	99.913	97.135	99.913
Terminal	99.913	99.913	99.826	99.913
En-Route	99.913	100.000	99.913	100.000
Oceanic	99.913	100.000	99.913	100.000

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