Annex 1
Methodology for determining statistics of short-term interference
between co-frequency, codirectional non-GSO FSS systems in circular orbits and other non-GSO FSS systems in circular orbits
or GSO FSS networks
1 Method and simulation approach
description
2 Simulation assumptions
2.1 Orbit model
2.1.1 Discussion
2.1.2 Perturbations
2.2 Consideration
of polarization isolation
2.3 Operational assumptions
2.3.1 Non-GSO
earth stations location
2.3.2 Tracking strategy
2.3.3 Power control on range
2.3.4 Traffic
2.4 Antenna parameters
2.4.1 GSO
earth station antenna parameters
2.4.2 Non-GSO
space station antenna parameters
2.4.3 GSO space
station antenna patterns
2.5 Input data
2.5.1 Orbit
parameters
2.5.2 Antenna
parameters
2.5.3 Operational
and computational parameters
2.5.4 Frequency
to be used for the assessment of interference
2.6 Output data
2.7 Calculation of the total simulation time, simulation time increment and
precession
2.7.1 Introduction
2.7.2 Simulation
time increment
2.7.3 Precession
and total simulation time
2.7.4 Dual
time step sizes
Annex 2 Methodology
for determining statistics of codirectional, co-frequency interference levels
between non-GSO FSS systems having circular
orbits and GSO FSS networks in frequency bands below 30 GHz
1 Introduction
2 Interference
scenario
3 Terminology
3.1 Earth related constants
3.2 Non-GSO satellite system space station related constants
3.3 GSO satellite network space station related constants
3.4 Earth station related
constants
4 Interference
computation
4.1 Step 1: Worst‑case identification
4.2 Step 2: Interference calculations
at worst case
4.2.1 Uplink interference computation
4.2.2 Downlink interference computation
5 Method to compute
the aggregate interfering noise power from a single non-GSO system
5.1 Method to compute the interference on the uplink
5.2 Method to compute
the interference in the downlink
5.2.1 Monte Carlo method for choosing GSO
ground station locations and their associated GSO satellite coverage
Annex 3 Description and example of computational
methodology in Annex 1
1 Introduction
2 Description of
computation methodology
2.1 Block
A – Constellation selection and set-up
2.2 Block
B – Initialize program constants
2.3 Block
C – Position constellation to time t
2.4 Block
D – Check visibility of satellites (interfering and wanted)
2.5 Block
E – Compute I0/N0 or epfd for all
interference paths
2.6 Accounting for
the aggregate impact of multiple earth stations/satellites on the interference
levels
2.6.1 Aggregate based on multiple
simulations
2.6.2 Aggregate based on one simulation
2.7 Expressions of
interference in terms of epfd and epfd¯
3 Example of
non-GSO and GSO interference methodology
3.1 Validation of
interference results
Annex 4 Continuing work programme