Policy on Intellectual Property Right (IPR)
Annex 1 Interference mechanisms, system parameters and compatibility
assessment criteria
1 Background and introduction
2 Types of interference mechanisms
2.1 Type A interference
2.1.1 Introduction
2.1.2 Type A1 interference
2.1.3 Type A2 interference
2.2 Type B interference
2.2.1 Introduction
2.2.2 Type B1 interference
2.2.3 Type B2 interference
3 Compatibility assessment parameters
3.1 Introduction
3.2 Characteristics of aeronautical systems
3.2.1 Designated operational coverage
3.2.2 Field strength
3.2.3 Frequencies
3.2.4 Polarization
3.3 Characteristics of FM broadcasting stations
3.3.1 Maximum effective radiated power
3.3.2 Horizontal radiation pattern
3.3.3 Vertical radiation pattern
3.3.4 Spurious emission suppression
3.3.5 Frequencies
3.3.6 Polarization
3.3.7 Free-space field-strength calculation for
broadcasting signals
3.4 Receiver input power
4 Compatibility assessment criteria
4.1 Standard interference thresholds
4.1.1 GBAS
4.2 Interference assessment criteria – GBAS receivers
4.2.1 Type A1 interference
4.2.2 Type A2 interference
4.2.3 Type B1 interference
4.2.4 Type B2 interference
Appendix 1 to Annex 1 GBAS coverage and minimum field strengths
Annex 2 General assessment method
1 Introduction
1.1 Philosophy of the general
assessment method
1.2 GBAS
2 Location and height of GBAS test points
for each DOC
2.1 GBAS precision approach test
points
2.1.1 Fixed test points
2.1.2 Test points related
to broadcasting stations
2.2 GBAS positioning test points
2.2.1 Test points related
to broadcasting stations that are inside each DOC
2.2.2 Test points related
to broadcasting stations that are outside each DOC
2.2.3 Additional test
points
3 Application of general assessment method
3.1 General
3.1.1 Test point selection
3.1.2 Broadcasting
stations to be included in the analysis at a test point
3.1.3 Compatibility
calculations
3.2 Special considerations regarding
compatibility assessments
3.2.1 Test point heights
greater than the minimum values
3.2.2 GBAS precision
approach test points
3.2.3 GBAS positioning
test points
3.2.4 Calculation of GBAS
field strength at test points
3.2.5 Calculation of Type
A1 potential interference
3.2.6 Calculation of Type
B1 potential interference
3.2.7 Calculation of Type
B2 potential interference
3.2.8 Multiple
interference
4 Broadcasting station antenna corrections
4.1 General
4.2 Polarization discrimination
4.3 Horizontal radiation pattern
4.4 Vertical radiation pattern
correction
4.4.1 v.r.p. corrections
for vertical apertures of two or more wavelengths
4.4.2 v.r.p. corrections
for vertical apertures of less than two wavelengths
4.4.3 v.r.p. corrections
for spurious emissions in the band 108-118 MHz
4.5 Combination of horizontal and
vertical radiation patterns
Appendix 1 to Annex 2 Location of test points with maximum
interference potential
1 Aircraft at the same height as a
broadcasting station antenna
2 Aircraft at a greater height than a
broadcasting station antenna
3 Relationship between vertical and
horizontal separation distances
4 Location of maximum interference
potential
5 Test points for GBAS positioning service
6 Test points for GBAS precision approach
service
7 Effect of increased test point height
Appendix 2 to Annex 2 Considerations regarding maximum field
strength and interference potential
1 Maximum field strength
2 Maximum Type B1 interference potential
Annex 3 Detailed compatibility assessment and practical
verification
1 Introduction
2 Matters requiring special attention
2.1 Prediction of broadcasting field
strengths
2.2 Test point considerations
2.3 Consideration of operating
stations
3 Multiple interference
4 Detailed compatibility assessment
5 Practical verification process
6 Summary
Annex 4 Definitions