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