report of the action team on global navigation satellite systems (gnss)

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Conditions and Constraints58. Defined for position solution meeting <strong>the</strong> representative user conditions and operatingwithin <strong>the</strong> service volume over any 24-hour interval. Based on using only satellites transmittingstandard code and indicating “healthy” in <strong>the</strong> broadcast navigation message (sub-frame 1).59. In support <strong>of</strong> <strong>the</strong> service availability standard, 24 operational satellites must be availableon orbit with 0.95 probability (averaged over any day). At least 21 satellites in <strong>the</strong> 24 nominalplane/slot positions must be set healthy and transmitting a navigation signal with 0.98 probability(yearly averaged).60. SPS Service Availability Standard conditions and constraints:> 99% Horizontal Service Availability average location.> 99% Vertical Service Availability average location.> 90% Horizontal Service Availability worst case location.> 90% Vertical Service Availability worst case location.61. The United States Government commits to providing SPS service reliability inaccordance with <strong>the</strong> following tolerances:Service Reliability Standard Conditions and Constraints:>= 99.94% global average 30-meter Not-to-Exceed (NTE) SPS SIS URE.• Standard based on a measurement interval <strong>of</strong> one year; average <strong>of</strong> daily values within <strong>the</strong>service volume.• Standard based on 3 service failures per year, lasting no more than 6 hours.>99.79% worst case single point average, 30-meters Not-to-Exceed (NTE) SPS SIS URE.• Standard based on a measurement interval <strong>of</strong> one year; average <strong>of</strong> daily values from <strong>the</strong>worst case point within <strong>the</strong> service volume.• Standard based on 3 service failures per year lasting no more than 6 hours each.Standard Global Average Positioning Domain Accuracy:> 13 meters 95% All-in-View Horizontal Error (SIS Only).> 22 meters 95% All-in-View Vertical Error!(SIS Only) Worst Site Positioning Domain:• Defined for position solution meeting <strong>the</strong> representative user conditions.• Standard based on a measurement interval <strong>of</strong> 24 hours for any point within <strong>the</strong> servicevolume defined for time transfer solution meeting <strong>the</strong> Accuracy = 36 meters 95% All-in-View Horizontal Error (SIS Only).>77 meters 95% All-in-View Vertical Error (SIS Only) Time Transfer Accuracy.>40 nanoseconds time transfer error 95% <strong>of</strong> time (SIS Only) representative user conditionsStandard based on a measurement interval <strong>of</strong> 24 hours averaged over all points within <strong>the</strong>service volume.16
Service Availability Standard62. The United States Government commits to maintaining <strong>the</strong> Position Dilution <strong>of</strong> Precision(PDOP) in accordance with <strong>the</strong> following tolerances:= 98% global Position Dilution <strong>of</strong> Precision (PDOP) <strong>of</strong> 6 or less.= 88% worst site PDOP <strong>of</strong> 6 or less.• Defined for position solution meeting <strong>the</strong> representative user conditions and operatingwithin <strong>the</strong> service volume over any 24-hour interval.• Based on using only satellites transmitting standard code and indicating “healthy” in <strong>the</strong>broadcast navigation message (sub-frame 1).• In support <strong>of</strong> <strong>the</strong> service availability standard, 24 operational satellites must be availableon orbit with 0.95 probability (averaged over any day). At least 21 satellites in <strong>the</strong> 24nominal plane/slot positions must be set healthy and transmitting a navigation signal with0.98 probability (yearly averaged).• Constellation availability: Representative Performance <strong>of</strong> 25-28 healthy satellites.63. The United States Government’s commitments for maintaining PDOP and constellationSPS SIS URE result in support for a service availability standard as presented below.SPS Service Availability Standard/Service Availability Standard Conditions and Constraints:= 99% Horizontal Service Availability average location.= 99% Vertical Service Availability average location.• 36 meter horizontal (SIS only) 95% threshold.• 77 meter vertical (SIS only) 95% threshold.• Defined for position solution meeting <strong>the</strong> representative user conditions and operatingwithin <strong>the</strong> service volume over any 24-hour interval.• Based on using only satellites transmitting standard code and indicating “healthy” in <strong>the</strong>broadcast navigation message (sub-frame 1).= 90% Horizontal Service Availability worst case location.= 90% Vertical Service Availability worst case location.• 36 meter horizontal (SIS only) 95% threshold.• 77 meter vertical (SIS only) 95% threshold.• Defined for position solution meeting <strong>the</strong> representative user conditions and operatingwithin <strong>the</strong> service volume over any 24-hour interval.• Based on using only satellites transmitting standard code and indicating “healthy” in <strong>the</strong>broadcast navigation message (sub-frame 1).• Constellation RMS User Range Error = SPS Performance Standard (October 2001) = 6meters with Representative Performance = 1.6 meters.• Service Reliability = SPS Performance Standard (October 2001) = 99.94% global,99.79% worst site, with Representative Performance = 100% global and 100% worst site.17
Page 1 and 2: REPORT OF THE ACTION TEAM ONGLOBAL
Page 3 and 4: This document has not been formally
Page 5 and 6: CONTENTSIntroduction ..............
Page 7 and 8: REPORT OF THE ACTION TEAMON GLOBAL
Page 9 and 10: Product4. The product of</s
Page 11 and 12: II.OVERVIEW OF PLANNED AND EXISTING
Page 13 and 14: virtually every facet of</s
Page 15 and 16: 27. Time and frequency disseminatio
Page 17 and 18: Service Availability Standard39. Th
Page 19 and 20: Table 1-4. Service Reliability Stan
Page 21: 50. The GPS Control Segment (CS) is
Page 25 and 26: 71. The GPS Navigation Message cons
Page 27 and 28: the Board, mainly
Page 29 and 30: • Vertical :• Velocity:• User
Page 31 and 32: • The network of
Page 33 and 34: 126. The EU and ESA have concluded
Page 35 and 36: • The Search and Rescue Service (
Page 37 and 38: invitation to tender to this effect
Page 39 and 40: 2. EGNOS169. As previously mentione
Page 41 and 42: 183. Three phases have been identif
Page 43 and 44: an air navigation service dedicated
Page 45 and 46: • Aviation: a representative desi
Page 47 and 48: 222. The information is openly avai
Page 49 and 50: 234. The United Nations Office for
Page 51 and 52: • Provide consultancy and advice
Page 53 and 54: 255. Methods to compare distant clo
Page 55 and 56: measurements are used to evaluate <
Page 57 and 58: market can begin to develop. That a
Page 59 and 60: Nations and voluntary contributions
Page 61 and 62: IV.GNSS APPLICATIONSA. General appl
Page 63 and 64: 317. Agricultural applications incl
Page 65 and 66: 326. The regional activity in <stro
Page 67 and 68: GNSS SBAS-WAAS trials in th
Page 69 and 70: 356. Other activit
Page 71 and 72: with respect to the</strong
Page 73 and 74:
379. Argentina has at present a “
Page 75 and 76:
Brazilian Continuous GPS Network (R
Page 77 and 78:
all mapping-related works in <stron
Page 79 and 80:
monitoring, national reference <str
Page 81 and 82:
Programs: B.Sc/M.Sc/Ph.D. in geomat
Page 83 and 84:
• University of
Page 85 and 86:
V. NEEDS AND CONCERNS OF DEVELOPING
Page 87 and 88:
Surveying, Mapping, Land Use• Pre
Page 89 and 90:
include Special Implementation Proj
Page 91 and 92:
VI.EXISTING TRAINING OPPORTUNITIES
Page 93 and 94:
465. Many other GN
Page 95 and 96:
• Theory and practice of<
Page 97 and 98:
D. GNSS training opportunities <str
Page 99 and 100:
VII.INSTITUTIONAL MODELS FOR INTERN
Page 101 and 102:
Environment Programme (UNEP), and <
Page 103 and 104:
appropriate national security reaso
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VIII.RECOMMENDATIONS541. A number <
Page 107 and 108:
for Outer Space Affairs, developmen
Page 109 and 110:
• Develop the sk
Page 111 and 112:
Recommendation 2. The development <
Page 113 and 114:
583. The need to develop th
Page 115 and 116:
589. Project 2:Pilot Projects (4 pr
Page 117 and 118:
Annex I: Indian universities, resea
Page 119 and 120:
University/researchinstitute/compan
Page 121 and 122:
Annex III: Italian universities and
Page 123 and 124:
Annex IV: Italian non-governmental
Page 125 and 126:
Annex IV: Italian non-governmental
Page 127 and 128:
APPENDIXList of we
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report of the action team on global navigation satellite systems (gnss)

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