International Flight Inspection Symposium

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Presentation transcript:

International Flight Inspection Symposium Oklahoma City, OK USA June 2008 Initial Federal Aviation Administration (FAA) Flight Inspection Criteria for Precision Instrument Approach Procedures Supported by the Local Area Augmentation System (LAAS) Michael F. DiBenedetto, Ph.D. Avionics Engineering Center, Ohio University Co-Author Dan G. Burdette FAA Flight Inspection Policy

Overview Background FAA LAAS flight inspection criteria Global Positioning System (GPS) Local Area Augmentation System (LAAS) Conceptual discussions (i.e. equation free!) FAA LAAS flight inspection criteria Why flight inspection is needed Rationale used to develop FAA criteria Overview of FAA draft Order 8200.LAAS Closing comments Initial FAA Flight Inspection Criteria for Procedures Supported by LAAS IFIS 2008, OKC

GPS Overview Provides position, velocity and time (PVT) determination Components Satellite constellation Operational control segment User segment (receiver) Standard Positioning Service (SPS) Augmentation needed to meet aviation accuracy, integrity, availability and/or continuity requirements Augmentations: Airborne based augmentation system (ABAS) Space based augmentation system (SBAS) Ground based augmentation system (GBAS) Initial FAA Flight Inspection Criteria for Procedures Supported by LAAS IFIS 2008, OKC

LAAS Overview LAAS is the USA “realization” of GBAS Provides more accurate position, velocity and time with integrity Components Satellite subsystem Ground subsystem > LAAS Ground Facility (LGF) User subsystem (LAAS receiver) Supports Typical service: 20 nm, 10,000 feet Approach/precision approach Departures Terminal Area Path (TAP) Airport surface operations PVT source for Automatic Dependent Surveillance Broadcast (ADS-B) Uses earth-centered, earth-fixed (ECEF) reference system (WGS-84 datum) Not source reference like conventional radio navigation system Importance of relative/absolute survey accuracy Initial FAA Flight Inspection Criteria for Procedures Supported by LAAS IFIS 2008, OKC

LGF Overview It is the subsystem that is “flight inspected” Paper discusses in detail Components Reference receivers, associated antennas VHF Data Broadcast (VDB) equipment, associated antennas Processor (hardware, software, database….) Operations and Maintenance Provides Broadcast of monitored differential range corrections Satellite health/status information Procedure path point data, including FAS data block Initial FAA Flight Inspection Criteria for Procedures Supported by LAAS IFIS 2008, OKC

GPS/LAAS Components Processor Operations Maintenance Control Initial FAA Flight Inspection Criteria for Procedures Supported by LAAS IFIS 2008, OKC

Reference Receiver Antenna AEC Reference Receiver Antennas (Demonstration system at Dallas-Fort Worth International Airport) Initial FAA Flight Inspection Criteria for Procedures Supported by LAAS IFIS 2008, OKC

LAAS Implementation in USA Implementation Process Develop operational requirements Formulate candidate system architectures Specify minimum performance in terms of system architecture specific parameters Generate performance verification procedures Includes the development and validation of LAAS flight inspection criteria Initial FAA Flight Inspection Criteria for Procedures Supported by LAAS IFIS 2008, OKC

LAAS Inspection Criteria Development High-level Process Identify objectives and parameters to be assessed Generate assessment procedures and tolerances Conditions required to put facility/procedure in service Develop inspection criteria and procedure that facilitate effective, efficient sampling of service volume Verify inspection criteria and procedures Implementation of initial criteria/procedures Assessment based on operational experience Revision to improve effectiveness, efficiency Initial FAA Flight Inspection Criteria for Procedures Supported by LAAS IFIS 2008, OKC

LAAS Inspection Criteria Development Rationale Consider test/qualification activities accomplished prior to flight inspection Airborne equipment/installation LGF equipment/installation Flight inspection not intended/required to accomplish above activities Assess site-specific elements of LAAS procedures and confirm availability of service Confirm procedure design Verify segment alignments Assess obstacle clearance Confirm GPS/VDB signal reception in service volume System accuracy performance Traditionally assessed for ground-based navigation aids LAAS accuracy time varying on sub-hourly basis Must be monitored by LGF in range domain In-tolerance position domain accuracy performance necessary condition Position domain measurement made during flight inspection provide meaningful functional test Initial FAA Flight Inspection Criteria for Procedures Supported by LAAS IFIS 2008, OKC

LAAS Inspection Criteria Development Require flight inspection Prior to commissioning on each runway served for each procedure When interference is reported, suspected and elimination cannot be verified on ground Existing procedures are revised or new procedures are introduced Specific changes to LGF hardware/software Physical site changes that could effect VDB coverage or GPS signal reception Initial FAA Flight Inspection Criteria for Procedures Supported by LAAS IFIS 2008, OKC

Overview FAA Draft Order 8200.LAAS Contains inspection procedures, requirements, and evaluation methods for LAAS Applies to LAAS approach procedures with decision altitudes ≥ 200 ft AGL Placeholders for TAP and airport surface Contents Cover letter Appendix 1, background material on LAAS Appendix 2, flight inspection procedures Appendix 3, flight inspection records and reports Appendix 4 acronyms and definitions Paper focuses on overview of appendix 2 Presentation highlights this overview (~overview2) Initial FAA Flight Inspection Criteria for Procedures Supported by LAAS IFIS 2008, OKC

Appendix 2 - Draft Order 8200.LAAS Addresses Pre-flight requirements Required system calibrations Determine LAAS maximum use distance (Dmax) FAS data block coding, download, confirmation Pre-flight requirements for parallel runways sites Flight inspection procedures Commissioning, periodic, special inspections Periodic: change in environment, modification of procedure Special: select maintenance/repair, user complaints VDB coverage assessment Instrument approach procedure assessments Flight inspection analysis and tolerances Initial FAA Flight Inspection Criteria for Procedures Supported by LAAS IFIS 2008, OKC

Parallel Runway Sites Define approach sectors Bound airspace common to all approach procedures have same landing direction Fictitious Approach Sector Alignment Point (FASAP) Fictitious Approach Sector Landing Threshold Point (FASLTP) Right Boundary Alignment Points #1, #2 (RBAP1/2) Left Boundary Alignment Points #1, #2 (LBAP1/2) Two approach sectors per parallel runway group Permits sufficient assessment of each procedure Improves efficiency by eliminating redundant VDB coverage assessments Initial FAA Flight Inspection Criteria for Procedures Supported by LAAS IFIS 2008, OKC

Parallel Runway Sites DETERMINE -Fictitious Approach Sector Alignment Point (FASAP) -Fictitious Approach Sector Landing Threshold Point (FASLTP) DETERMINE -Right Boundary Alignment Points #1, #2 (RBAP1/2) -Left Boundary Alignment Points #1, #2 (LBAP1/2) Initial FAA Flight Inspection Criteria for Procedures Supported by LAAS IFIS 2008, OKC

Condensed/Combined Tables 1 & 2 Requirement Evaluation Area Basic Method (Single Runway) Modified Method (Parallel Runways) Done for Measured Value Normal Approach From 20 NM to LTP Fly on path, on course No change Each approach procedure 1) LAAS Receiver maintains “GBAS” Integrity 2) No CDI Flags Lower-Limit of Approach From 21 NM and 5000 above LGF, fly on course, intercept and fly glide path within 1 dot of full scale below path Same as above ………………………………………………………………………………. Left-Limit of Approach From 21 NM, fly on path and offset course to within 1 dot of full scale of “fly right” From 21 NM, on path and fly along left limit of approach sector boundary For left limit of each approach sector Right-Limit of Approach From 21 NM, fly on path and offset course to within 1 dot of full scale of “fly left” From 21 NM, on path and fly along right limit of approach sector boundary For right limit of each approach sector Missed Approach From Runway Stop End to 4 NM Fly runway course, climb at 200 feet per NM Roll Out From Runway End to Runway End Taxi along runway Once for each runway 2) No Lateral CDI Flags Initial FAA Flight Inspection Criteria for Procedures Supported by LAAS IFIS 2008, OKC

Parameters Recorded, Tolerances Table 3. GPS Satellite Parameters Recorded Table 4. Tolerances for LAAS Flight Inspection Parameter Expected Values Horizontal Protection Level (HPLGBAS)  10m Vertical Protection Level (VPLGBAS) Horizontal Dilution of Precision (HDOP)  4.0 Vertical Dilution of Precision (VDO)P Horizontal Integrity Limit (HIL)  0.3nm Figure of Merit (FOM)  22meters Satellites Tracked 5 Minimum Signal-to-Noise Ratio (SNR) 30 dB/ Hz minimum Parameter Tolerances Terminal Area Path (Reserved) Initial/Intermediate Approach Segment FAA Order 8200.1 Final Approach Segment FAS data: Bearing to LTP Glidepath Angle FAS Data CRC Threshold Crossing Height Course Alignment w/runway C/L  0.1 true course  0.050 No Corruption 2 m Centerline Missed Approach Segment Coverage VDB signal Indicates GBAS mode Horizontal Protection Level Vertical Protection Level 40m 10m Co-channel / adjacent channels (VOR or ILS) Annex 10, V1, Attch D Para 7.2 No misleading information RFI Maximum Usable Distance (Dmax) As defined by LGF Site. Initial FAA Flight Inspection Criteria for Procedures Supported by LAAS IFIS 2008, OKC

Closing Comments Provided overview of FAA DRAFT Order 8200.LAAS Not intended to provide verbatim citation Inform flight inspection community of its status Share insight used to develop order Promote continued discussion of subject Future activities TAP and Airport Surface Under development Initial criteria/procedures expected fall 2008 Order Revisions As experience is gained As Category II/III equipment becomes available Initial FAA Flight Inspection Criteria for Procedures Supported by LAAS IFIS 2008, OKC