MIT ICAT Altimetry · MIT ICAT Altimetry yStandard Atmosphere ... yGyro Compass Precession ......
Transcript of MIT ICAT Altimetry · MIT ICAT Altimetry yStandard Atmosphere ... yGyro Compass Precession ......
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MIT ICATMIT ICAT Altimetry
Standard Atmosphere Referenced29.92 inches of Hg3014 mb
Pressure AltitudeAltitude of Pressure in Std AtmosphereUsed above reference Flight Level (FL180 in US)
Density AltitudeAltitude of density in Std AtmosphereUsed for performance (TO)
Barometric AltitudeEstimated altitude corrected for surface pressureMSL Altitude above Mean Sea Level (QNH)AGL Altitude above Ground Level (QFE)
Radar Altitude (Cat II and III Approaches)5 cm radar - normally only below 3000ft (Terrain Noise)
Cabin Altitude (Pressurization)
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MIT ICATMIT ICAT Airspeed
Pneumatic Measurement based on Dynamic PressurePitot and Static
Indicated AirspeedIndicated on InstrumentMeasurement of pressure on Aircraft (ie Load)Used for structural operating limits
Calibrated AirspeedPitot-Static Errors Calibrated outUsed for Flight Test and Performance
GroundspeedAchieved speed over ground
Mach NumberRequires Static Air Temperature
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MIT ICATMIT ICAT Air Data Sensors
Pitot TubeHeated for De-Ice
Static PortLocation SensitiveTypically 1/3 Back on Fuselage on Conventional aircraftBilateral with crosstie to avoid Side Slip ErrorsWater Drain
Alpha VaneHeated for De-Ice
TAT ProbeInertial Separator for WaterHeated for De-Ice
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MIT ICATMIT ICAT Temperature
Static Air Temperature
Ram Rise
Total Air Temperature
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MIT ICATMIT ICAT Integrated Air Data Systems
Air Data ComputerCompensates out Static System ErrorsCitation Example
Air Data Heading and Reference Systems (ADHARS)
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MIT ICATMIT ICAT Heading
Magnetic CompassVariation (Magnetic DeviationDeviation (Magnetic materials)
DC9 ExampleCompass Card (Calibrated with Radios and Equip on)
Flux Gate CompassElectronic Magnetic Compass
Normally in Tail for deviation
Gyro CompassPrecessionSlaved Flux Gate
Turn Coordinator(Rate Gyro)
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MIT ICATMIT ICAT Inertial Reference Unit
Integrate acceleration from known position and velocityVelocityPosition
Need HeadingGyros
MechanicalLaser
Can get AttitudeArtificial Horizon (PFD. HUD)
Drift ErrorsIRU unusable in vertical direction (need baro alt)Inflight Correction
DMEGPSStar Sighting for Space Vehicles
Measurement Give Attitude Also
777 Analytical Redundancy
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MIT ICATMIT ICAT Communications
RequirementsCommunicate necessary information between formation elements andcommand node (LAN and Air-Ground)BandwidthLow-Observable?Synchronous vs asynchronous
ConstraintsSpectrumAntenna Location
TechnologiesRadio
UHF, VHF, MMWOptical
LaserProtocols
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MIT ICATMIT ICAT COMMUNICATION
VoiceVHF (line of sight)
118.0-135.0 Mhz.025 spacing in US, 0.083 spacing in Europe)
UHF 230-400 Mhz (guess)
HF (over the horizon)Optical (secure)
DatalinkACARS (VHF) - VDL Mode 2VDL Modes 3 and 4 (split voice and data) HF Datalink (China and Selcal)
Geosynchronous (Inmarsatt)Antenna Requirements
LEO and MEO Networks
Software Radios
Antenna Requirements
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MIT ICATMIT ICAT Bandwidth Growth Trend
Source: DOD UAVRoadmap, 2000
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MIT ICATMIT ICAT
Navigation (relates to Surveillance)
RequirementsGeneral Navigation (medium precision)Station Keeping (high precision)IntegrityAvailability
ConstraintsExisting nav systemsLoss of signal
TechnologiesGPS/Galileo (need Differential)
Code vs Carrier Phase ApproachesIRS/GPSSensor Based Approaches for Station Keeping
Image (Visible, IR)Range Finders (Laser, Ultrasonic)
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MIT ICATMIT ICAT NAVIGATION (ENROUTE)
Radionavigation beaconVHF Omnidirectional Range (VOR)Non-Directional Beacon (NDB)Distance Measuring Equipment (DME)TACAN
Area navigation systems (ground based)OmegaLORAN
Inertial navigation systems
Satellite navigation systemsGPS (CA)GNSS (Galileo?)
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MIT ICATMIT ICAT GPS
From http://www.Colorado.Edu/geography/gcraft/notes/gps/gps_f.html
(Courtesy of Peter Dana. Used with permission.)
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MIT ICATMIT ICAT GPS
From http://www.colorado.Edu/geography/gcraft/notes/gps/gps_f.html
Courtesy of Peter H. Dana, The Geographer's Craft Project, Department of Geography, The University of Colorado at Boulder. Used with permission.
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MIT ICATMIT ICAT
GPS ISSUES
RequirementsAccuracyIntegrityAvailability
Selective Availability (SA)Degraded to 100m accuracy
Control by US DoDInternational concerns
US guarantee of service free to worldthrough 2005
Vulnerability to jamming
DGPSWAASEGNOSLAAS
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MIT ICATMIT ICAT
NAVIGATION TRENDS (APPROACH)
Instrument Landing System (ILS)Cat. I (200 ft; 1/4 mile)Cat. II (50 ft; 800 RVR)Cat. III (0,0)
Microwave Landing System (MLS)
GPS (100m)Wide Areas Augmentation System (5m)
LNAV-VNAV (250, 1/4 mile)Local Area Augmentation System (0.1m)
Cat. III?
Change to Required Navigation Performance (RNP)RNP X X is 95% lateral containment on NM
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MIT ICATMIT ICAT
NAVIGATION TRENDS (APPROACH)
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MIT ICATMIT ICAT
NAVIGATION TRENDS (APPROACH)
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MIT ICATMIT ICAT
GPS Approach Navigation
RequirementsAccuracy (RNP)AvailabilityIntegrity
Differential GPSWide Area Augmentation System (WAAS)Local Area Augmentation System (LAAS)
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MIT ICATMIT ICAT
Surveillance
RequirementsObserved states of lead elements sufficient to form-up and maintain Feed forward states (intent)
ConstraintsSight AnglesInstallation (weight, cost, power, etc)Cooperative Targets
TechnologiesAutomatic Dependant Surveillance Broadcast (ADS-B)Image Based Systems (Vis, IR)Radar (X Band, MMW0Range Finders (Laser)Sensor Fusion Systems
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MIT ICATMIT ICAT RADAR
Weather Radar (10 CM)
Search and TrackDoppler
Synthetic Aperture Radar
Radar Altimeter
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MIT ICATMIT ICAT RADAR
Wavelength λS Band (10 cm)X Band (3 cm)Ku Band (1 (cm)Millimeter Wave (94 Ghz pass band)
Radar Range Equation
Beamwidth ΘΘ = λ/DD = Diameter of Circular AntennaPencil beam vs Fan Beam
Mechanically Steered AntennasScan and Tilt
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MIT ICATMIT ICAT Imaging and Night Vision Systems
InfraredSpecial Optics (eg Gallium Arsinide)Water ContaminationSensor Cooling Requirements
Image Intensifier Systems
Pointing Systems
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MIT ICATMIT ICAT Datalink Based Systems
JTIDS
Mode S TranspondersTraffic Information Service
ADS-B
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MIT ICATMIT ICAT
Self Reporting Aircraft StatesADS-B
Bob HilbUPS/Cargo Airline Association
(Image removed due to copyright considerations.)
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MIT ICATMIT ICAT
INTENT REPRESENTATION(consider other states)
Intent formalized in “Surveillance State Vector”
Accurately mimics intent communication & execution in ATC
⎪⎪⎪⎪
⎭
⎪⎪⎪⎪
⎬
⎫
⎪⎪⎪⎪
⎩
⎪⎪⎪⎪
⎨
⎧
D(t) states, nDestinatioT(t) states, trajectory Planned
C(t) states, target CurrentA(t) states, onAccelerati
V(t) states,Velocity P(t) states, Position
Traditional dynamicstates
Defined intentstates
Surveillance StateVector, X(t) =
FMS
Currenttarget state, C(t)
Destination, D(t)
Plannedtrajectory, T(t)
MCP
PILOT
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MIT ICATMIT ICAT
ADS-B SURVEILLANCE ENVIRONMENT
Potential access to more states (e.g. dynamic and intent)
Need to assess benefits for conformance monitoring
A/CINTENT
CONTROLSYSTEM
AIRCRAFTDYNAMICS
Position, P(t)Velocity, V(t)Accel., A(t)
PILOTINTENT
Targetstates,
Guidancemode
Nav.accuracye.g. ANP
Controlsurfaceinputs
A/cproperty
e.g. weight
Trajectory,Destination
Position,Baro altitude
Heading, SpeedsRoll, ...
Targetstates
ACTUAL SYSTEM REPRESENTATION
Trajectory
ADS-B SURVEILLANCE SYSTEM
Other usefulstates???
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MIT ICATMIT ICAT Engine Instrumentation
Rotation RatesN1
Exhaust Pressure Ratio
TemperaturesTurbine Inlet Temperature
Oil Pressure
Oil Temp
Vibration
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MIT ICATMIT ICAT Warning Systems
Master CautionFireLow Pressure (eg oil)…
Stall WarningStick Shaker
Traffic Collision Avoidance System (TCAS)
Enhanced Ground Proximity Warning System (EGPWS)
Envelope Protection
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MIT ICATMIT ICAT Envelope Protection
FlyFly--byby--wire protection wire protection -- Normal LawNormal Law
Pitchattitude
Loadfactor
High*AOA
Bankangle
Overspeed
* Angle of Attack (AOA)* Angle of Attack (AOA)
Ground mode
Flaremode
Flight mode
Flight mode
Takeoffmode
Ground mode
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MIT ICATMIT ICAT
VLS
Vα Prot
Vα Max
Vα Floor
140
120
CLAirspeed scalescale
α Angle of Attack (AOA)
α Stall: Sudden loss of lift and or aircraft control
Angle of attack reached with full aft stick (max aircraft performance) Angle of attack, where TOGA thrust isautomatically applied by the A/THRAngle of attack from which stick input is converted into angle of attack demand (stick neutral α Prot)
α VLS: Angle of attack reached at approach speed (VLS)
α Max:
α Prot:
α Floor:
High Angle of Attack Protection
CL