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2.1.2Standards3
2.1.2.1FAAStandards3
2.1.2.2FAAOrders3
2.2Non-GovernmentDocuments4
3.0Requirements5
3.1WAASFOCDefinition5
3.1.1WAASObjectives5
3.1.3WAASFunctions5
3.1.3.1WAASMessageBroadcastandRanging5
3.1.3.1.1MessageFormat6
3.1.3.1.2RepetitionofGPS/WAASSISAlarmMessages6
3.1.3.1.3MessageBroadcastandRanging6
3.1.3.1.4MonitorWAASSignalQuality6
3.1.3.1.5UpdateIntervals6
3.1.3.1.5.1PRNandIGPMaskUpdate6
3.1.3.1.6Test………………………………………………………………………………..6
3.1.3.2WAASOperationsandMaintenance（O&
M）6
3.1.3.2.1OperationsandMaintenanceDataCollection7
3.1.3.2.1.1WAASConfigurationData7
3.1.3.2.1.2WAASStatusData7
3.1.3.2.1.3WAASPerformanceData7
3.1.3.2.1.4ManualInputs7
3.1.3.2.2SystemMonitorandControl7
3.1.3.2.2.1Off-LineMonitoring7
3.1.3.2.2.2Processing8
3.1.3.2.3CorrectiveMaintenance8
3.2SystemCharacteristics9
3.2.1UserServicePerformanceRequirements9
3.2.1.1LNAVService9
3.2.1.1.1LNAVServiceAreas9
3.2.1.1.1.1LNAVCONUSServiceVolume10
3.2.1.1.1.2LNAVAlaskaServiceVolume10
3.2.1.1.1.3EnRouteOutsideofCONUS（OCONUS）ServiceVolume10
3.2.1.1.2LNAVAccuracy10
3.2.1.1.3LNAVAvailability10
3.2.1.1.3.1LNAVCONUSAvailability10
3.2.1.1.3.2LNAVAlaskaAvailability11
3.2.1.1.3.3EnRouteOCONUSAvailability11
3.2.1.1.5LNAVIntegrity11
3.2.1.1.5.1LNAVProbabilityofHazardouslyMisleadingInformation（P（HMI））11
3.2.1.1.5.2LNAVWAASCorrectedAccuracy11
3.2.1.1.5.3GEOUserRangeAccuracy（URA）11
3.2.1.1.5.4WAASNetworkTimetoGPSNetworkTimeMaximumOffset11
3.2.1.2LPVService12
3.2.1.2.1LPVServiceAreas12
3.2.1.2.1.1LPVCONUSServiceVolume12
3.2.1.2.1.2LPVAlaskaServiceVolume12
3.2.1.2.2LPVAccuracy12
3.2.1.2.2.1CONUSLPVHorizontalAccuracy12
3.2.1.2.2.2CONUSLPVVerticalAccuracy12
3.2.1.2.3LPVAvailability12
3.2.1.2.3.1LPVCONUSAvailability12
3.2.1.2.3.2LPVAlaskaAvailability12
3.2.1.2.5LPVIntegrity12
3.2.1.2.5.1LPVProbabilityofHazardouslyMisleadingInformation（P（HMI））13
3.2.1.3TimetoAlarm13
3.2.1.3.1LPVTimetoAlarm13
3.2.1.3.2LNAVTimetoAlarm13
3.2.2ProcessingRequirements13
3.2.2.1SystemCapacity13
3.2.2.1.1WAAS13
3.2.2.2SoftwareDevelopment13
3.2.2.2.1ComputerResourceReserveCapacity13
3.2.2.2.2ComputerMemory14
3.2.2.2.2.1VolatileMemory14
3.2.2.2.2.2Non-VolatileMemory14
3.2.2.2.3ProcessingSpeed14
3.2.2.3AntennaPhaseCenterLocationRequirements14
3.2.2.3.1LocalMonumentLocationRequirements14
3.2.2.4SignalProcessingRequirements15
3.2.2.4.1SensitivityandDynamicRange15
3.2.2.4.1.1L1-C/ASignalProcessingRequirements15
3.2.2.4.1.2L2-P（Y）SignalProcessingRequirements15
3.2.2.4.2RFInterferenceRejection15
3.2.2.4.2.1In-Band15
3.2.2.4.2.2Out-Of-Band16
3.2.2.4.2.3GEOUplinkProtection17
3.2.3InterfaceRequirements17
3.2.3.1ExternalInterfaceRequirements17
3.2.3.1.1GPSSatellitestotheWAAS18
3.2.3.1.2WAAStoUser18
3.2.3.1.3WAASExternalInterface18
3.2.3.1.4NAStoWAAS18
3.2.3.2InternalInterfaceRequirements18
3.2.4GroundBasedElectronicEquipment18
3.2.4.1Electrical18
3.2.4.1.1PowerFactor18
3.2.4.1.2InrushCurrent19
3.2.4.1.3Harmonics21
3.2.4.1.4GroundingandBonding21
3.2.4.2TransformerIsolationofNon-SwitchingDCPowerSupplies22
3.2.4.3MechanicalInstallation22
3.2.4.3.1EquipmentRacks22
3.2.4.3.1.1PulloutDrawers22
3.2.4.3.1.2RackPanels22
3.2.4.4Moisture22
3.2.4.5Accessibility22
3.2.4.5.1General22
3.2.4.5.2LineReplaceableUnits（LRUs）23
3.2.4.6InteriorEquipmentDesignRanges23
3.2.4.6.1IndoorOperatingEnvironments23
3.2.4.7ExteriorEquipmentDesignRanges23
3.2.4.7.1OutdoorOperatingEnvironmentalConditions23
3.2.4.8SeismicZoneDesign23
3.2.4.9BarCoding23
3.2.5SystemQualityFactors23
3.2.5.1Reliability24
3.2.5.1.1WAASReliabilityandRedundancy24
3.2.5.1.2MeanTimeBetweenFailure（MTBF）24
3.2.5.1.3WAASReliabilityandAvailability24
3.2.5.2Maintainability24
3.2.5.2.1PeriodicMaintenanceInterval24
3.2.5.2.2PeriodicMaintenanceServiceInterruptions24
3.2.5.2.3CorrectiveMaintenanceServiceInterruptions24
3.2.5.2.4RedundantEquipmentSwitching24
3.2.5.2.5Fail-Safe,Fail-SoftOperation24
3.2.6HumanEngineering24
3.2.7SystemSecurity24
3.2.7.1PhysicalSecurity25
3.2.7.1.1PhysicalAccessSecurity25
3.2.7.1.2PhysicalAccessSecurityofLeasedGEOUplinkFacilities25
3.2.7.1.3PhysicalAccessSecurityofInternationalWAASReferenceStations25
3.2.7.2ComputerSecurity25
3.2.7.2.1IsolationofCriticalWAASAssetsFromNon-WAASSubsystems25
3.2.7.2.1.1WAASOnlyUse25
3.2.7.2.1.2CriticalSubsystemInterfaceIsolation25
3.2.7.2.2BootOnlyToWAASApplication26
3.2.7.2.2.1BaselineConfigurationofWAASWorkstations26
3.2.7.2.3LoginOnlyViaWAASApplication26
3.2.7.2.3.1AccesstoOperatingSystem26
3.2.7.2.3.2LoginAccounts26
3.2.7.2.3.3Passwords26
3.2.7.2.3.4PasswordExpiration26
3.2.7.2.3.5UnsuccessfulLogin27
3.2.7.2.3.6Logoff27
3.2.7.2.3.7EncryptedPasswordStorageandTransmittal27
3.2.7.2.3.8AccountPrivilegeRestrictions27
3.2.7.2.4Copying,Moving,Loading,andDownloadingofFiles27
3.2.7.2.4.1LoadingandDownloadingofWAASApplicationSoftware27
3.2.7.2.4.2ApplicationSoftwareFileIntegrityChecksatStartup27
3.2.7.2.4.3O&
MExternalFileIntegrityChecks27
3.2.7.2.4.4UpdatingofSoftwareVersions28
3.2.7.2.4.5O&
MSoftwareVersionDisplays28
3.2.7.2.5OperatorInadvertentActionSafeguards28
3.2.7.2.5.1RedundancyofSystemStatusAlertsandDisplays28
3.2.7.2.6MessageCenterProcessor（MCP）Security28
3.2.7.3NetworkSecurity28
3.2.7.3.1IndependentNetworks28
3.2.7.3.2Point-to-PointConnectivity28
3.2.7.3.3FOCBackboneNetworkIntrusionDetection&
Firewalls28
3.2.7.3.4EncryptionoftheFOCBackboneNetworks29
3.2.7.3.5BackboneRouterSecurityConfigurationProtection29
3.2.7.3.5.1EncryptionKeyDistributionFail-SoftCapability29
3.2.7.3.6WAASApplicationCommunicationProtocol29
3.2.7.3.6.1WAASCommunicationProtocolMessageValidation29
3.2.7.3.6.2NotificationofFailedCommands29
3.2.7.3.7WAASExternalInterfaceExternalSecurityRequirements29
3.2.7.4CollectionofSecurityAuditData29
3.2.7.4.1LogonandLogoffRecords30
3.2.7.4.2AccountChanges30
3.2.7.4.3IntrusionDetectionRecords30
3.2.7.4.4ConfigurationChangeRecords30
3.2.7.4.5PeriodicConfigurationCheckRecords（needtoverify）30
3.2.7.4.6ConsolidationofAttackDataintoRecordingEvents30
3.2.7.4.7DownloadofAuditRecords30
4.0QualityAssurance31
4.1TestProgram31
4.1.1WAASTestProgram31
4.1.1.1SoftwareQualification31
4.1.1.2HardwareQualityAssurance31
4.1.1.3VerificationRequirementsTraceabilityMatrix（VRTM）31
4.1.1.4TypesofTesting31
4.1.1.4.1DevelopmentTestandEvaluation（DT&
E）31
4.1.1.4.1.1EngineeringEvaluationandTestRequirements31
4.1.1.4.1.2QualificationTesting32
4.1.1.4.1.3FormalTestVerificationofPerformance32
4.1.1.4.2ProductionAcceptanceTestandEvaluation（PAT&
E）32
4.2GeneralTestingRequirements32
4.2.1FAAWitnessingofTesting32
4.2.2QualityAssuranceProgram32
4.2.2.1QualityAssuranceProgramGuidance32
4.2.2.2HardwareandSoftwareQualityControlSystems32
4.2.2.3TestConduct32
4.2.3ConfigurationManagement32
4.2.4RegressionTesting33
4.3SpecialTestsandExaminationRequirements33
4.3.1UseofSimulation33
4.3.2TestSamples33
4.3.3InterruptionofTests33
4.3.4FailureReportingandTracking33
4.3.5QualificationofTestEnvironment33
4.4UserServicePerformanceTestingandAnalysis33
4.4.1P（HMI）Analysis33
AppendixA.FOCVerificationRequirementsTestMatrix34
LISTOFFIGURES
Figure31.Out-of-BandRejectionCharacteristicsforCWInterference17
Figure33.InrushCurrentLimitRatios20
LISTOFTABLES
Table11.WAASWide-areaReferenceStation（WRS）Sites2
Table31.In-BandPulsedInterference15
Table33.Out-of-BandRejectionCharacteristics16
Table35.LimitsofIndividualHarmonicsDistortion21
1.0Scope
1.1Identification
ThisSpecificationestablishesthefunctionalandperformancerequirementsfortheWideAreaAugmentationSystem（WAAS）FullOperationalCapability（FOC）.
1.2SystemOverview
TheWAASisasafety-criticalsystemconsistingoftheequipmentandsoftwarethataugmentstheDepartmentofDefense（DOD）GlobalPositioningSystem（GPS）StandardPositioningService（SPS）.TheWAASprovidesasignal-in-spacetoWAASUserstosupportallphasesofflight.WAASUsersincludeallaircraftwithapprovedWAASavionicsusingtheWAASforanyapprovedphaseofflight.Thebroadcastsignal-in-spaceprovidestwofunctions:
（1）messaging（dataonGPSandGEOsatellites）;
and,
（2）arangingcapability.BackgroundinformationregardingtheGPScanbefoundtheGPSSPSPerformanceStandard.
DatafromtheGPSsatellitesarereceivedandprocessedatwidelydispersedsites,referredtoasWide-areaReferenceStations（WRSs）（SeeTable11）.Thesedataareforwardedtodataprocessingsites,referredtoasWide-areaMasterStations（WMSs）,whichprocessthedatatodeterminetheintegrity,differentialcorrections,residualerrors,andionosp
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