Gbas Flight Test

Flight Testing of GBAS in Tianjin Airport
Liu Shuming
Flight Inspection Center of CAAC, China
2019.06.05
Introduction
During the past 4 years, Flight Inspection Center of CAAC has

made several flight tests for the certification of GBAS ground
equipment LGF-1A(at Tianjin airport) and SLS-4000(at Pudong
airport).
The flight tests theory and method are the same, and the flight
tests at Tianjin airport is introduced here.
Contents
01 GBAS Flight Testing Standards
02 GBAS Flight Testing Theory
03 Flight Testing Procedure and Method
04 Conclusion and Data Analysis

Standards
• ICAO ANNEX 10 • Testing Requirements for GBAS ( Cat-I PA) CAAC

• ICAO DOC-8071 Volume II • Technical Requirements for GBAS ground
• FAA DOC-8200.1D equipment ( Cat-I PA) CAAC
1.1 Flight tests of GBAS are required when:
• Commissioning
• Interference
• Procedure modification or the introduction of a new procedure
• Changes occur to the GBAS configuration
• Site changes
• Following certain maintenance activities
• Certification
1.2 Preparation for flight testing

3. FAS DATA
1. Measure runway coordinates, VDB antenna
position, and verify the coordinates and
height of the DGPS station reference point Data Content
Airport ID
required by the inpection aircraft.
Runway Number
LTP Latitude
Runway length
Magnetic variation LTP Longitude
VHF frequency LTP Height
GLS channel FPAP Latitude
VDB position FPAP Longitude
RTK reference point Approach Threshold
Crossing Height (TCH)
Glide Path Angle (GPA)
2. GBAS Procedure
1.3 Parameters
1.3 Parameters
FAS Data Block Validation VDB Coverage

The FAS data received Within the minimum required
by the receiver is GBAS coverage volume of each final
consistent with the approach segment served, the
published data. minimum and maximum VDB field
strength requirements must be met.
Approach Procedure Validation GNSS signals

Guide accuracy meets GPS satellite number, signal to noise
the requirements of ratio and DOP value during flight.
precision approach.
VDB Service volume

VDB field strength
8071 Requirements
GBAS/H field >-99dBW/m2 to -35dBW/m2

strength
GBAS/E field
strength
Horizontal >-99dBW/m2 to -35dBW/m2
Vertical >-103dBW/m2 to -39dBW/m2

GPS Satellite Parameters
The question proposed at the meeting yesterday:
Could you provide more detailed explanation on "Check

GNSS Signal Quality" in p.5 and 6 (Requirements of GBAS
and SBAS)? Could you specify which part of Doc 8071
requires this?
GNLU-930 Multimode Receiver
GBAS DATA MMR FIS Software

Receiver Horizontal
GPS Differential vertical
VDB STATION correction data deviation
information
FAS DATA BLOCK FAS

DATA Output
The
Result
Calculate
deviation
informati
RTK STATION DGPS DATA on
(FIS)
Reasons for choosing Tianjin Airport:

1. The amount of flights is moderate.
2. The dual runway verifies the ability of a GBAS facility to cover multiple directions of multiple
runways.
3. Airspace resources are relatively constrained , and GBAS can optimize flight procedures after
installation, which can solve the problem of flight flow control that may be faced in the future.
4. Located in the plain, the transportation is convenient, there is no special demand for the
construction of the project, which is conducive to the implementation of the project and
equipment testing.
Ground taxiing Orbit Arcs
Check item: Flight method: Flight method:

FAS Data Validation , Verifying Take the FTP/LTP (landing entry Fly an arc ±10 degrees across the
course Deviation point) as the center, the flight extended Final Approach Segment
VDB Coverage height is 1500m, 3000m, and course at 37 km
the radius is 20 NM. (20 NM) from the FTP/LTP. Fly an arc
Check item: ±35 degrees across the extended
Coverage and interference of Final Approach Segment at 28 km (15
VDB signals. NM).
Check item:
Coverage of the VDB signal in the
approach direction
LEVEL RUN APPROACH
Flight method:
Flight method:
The flight inspection aircraft flies
Proceed inbound along the final
towards the FTP at 3000m height,
approach course following the procedure.
following the localizer center line,
Intercept the glidepath and fly to an
commencing at a distance of 23NM
altitude of 30 m (100 ft).
and ends at 2.5NM.
Check item:
Check item:
VDB signal coverage and DGPS positioning
VDB signal coverage in approach
accuracy in the approach direction.
segment.
Validation of flight procedure and missed
approach procedure.
GLS PROCEDURE
RWY 16R、34L RWY 16R、34L
01 02
.
1、Runway round-trip
2、 Taxiing along the centerline of the
Flight
runway
method
3、S-Line Taxiing along the centerline of
the runway
Take the FTP/LTP (landing entry point)
1、Signal reception, record field strength Flight as the center, the flight height is
2、FAS Data Validation , Verifying course method 1500m, 3000m, and the radius is 20
Check
item
deviation NM.
3、VDB Coverage
Check Coverage and interference of VDB

item signals.
RWY 34L RWY 16R、34L
03 04
.
Fly an arc ±10 degrees across the

extended Final Approach Segment The flight inspection aircraft flies towards the
Flight course at 37 km Flight FTP at 3000m height, following the localizer
method (20 NM) from the FTP/LTP. Fly an arc method center line, commencing at a distance of
±35 degrees across the extended Final 23NM and ends at 2.5NM.
Approach Segment at 28 km (15 NM).
Check VDB signal coverage in the approach
Check Coverage of the VDB signal in the item segment.
item approach direction
05 Flight
Proceed inbound along the final
approach course following the
procedure.
method
Intercept the glidepath and fly to an
.
altitude of 30 m (100 ft).
VDB signal coverage and DGPS

positioning accuracy in the approach
Check
direction
item
Validation of flight procedure and
missed approach procedure
Orbit flight real-time curve

Arc flight real-time curve and results LEVEL RUN flight real-time curve and results
Approach flight real-time curve and results

About US—CFIC(Flight Inspection Center of CAAC)
 Conduct flight inspection for more than 250 airports in China.

 10,000 flight hours each year.
 IEC/ISO 17025 certification.
 21 flight inspection aircrafts:1 King Air 350, 5 Citation XLS, 11 Citation XLS+, 3 Citation
Sovereign and 1 G450.
 ILS, VOR/DME, NDB, SSR/PSR, PAPI, VHF, PBN(RNP&RNAV), ADS-B, RFI, HUD,GBAS, VDL-2……
THANK YOU!

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Flight Testing of GBAS in Tianjin Airport

During the past 4 years, Flight Inspection Center of CAAC has

01 GBAS Flight Testing Standards

02 GBAS Flight Testing Theory

03 Flight Testing Procedure and Method

04 Conclusion and Data Analysis

• ICAO ANNEX 10 • Testing Requirements for GBAS ( Cat-I PA) CAAC

1.1 Flight tests of GBAS are required when:

1.2 Preparation for flight testing

FAS Data Block Validation VDB Coverage

Approach Procedure Validation GNSS signals

VDB Service volume

VDB field strength

GBAS/H field >-99dBW/m2 to -35dBW/m2

Horizontal >-99dBW/m2 to -35dBW/m2

Vertical >-103dBW/m2 to -39dBW/m2

The question proposed at the meeting yesterday:

Could you provide more detailed explanation on "Check

GNLU-930 Multimode Receiver

GBAS DATA MMR FIS Software

FAS DATA BLOCK FAS

Reasons for choosing Tianjin Airport:

Ground taxiing Orbit Arcs

Check item: Flight method: Flight method:

LEVEL RUN APPROACH

RWY 16R、34L RWY 16R、34L

Check Coverage and interference of VDB

RWY 34L RWY 16R、34L

Fly an arc ±10 degrees across the

VDB signal coverage and DGPS

Orbit flight real-time curve

Approach flight real-time curve and results

 Conduct flight inspection for more than 250 airports in China.

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