harmful interference and geolocation in china - itu · 2016. 6. 14. · space monitoring network in...
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International Satellite Communication SymposiumJune 2016, Geneva
The State Radio Monitoring Center, MIIT, China
Harmful interference and geolocationin China
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Space monitoring networkin China
Trends and Question
01 02 03Harmful
interference
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Space monitoring network in China 01
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Spectrum efficiency evaluation• Spectrum occupancy measurement• GSO Satellite Orbit usage evaluation
Signal parameter and transmitter inspection• Signal interception (signal of interest)• Parameter measurements• Demodulation and recognition• Data recording and report produce
Enforcement• Geolocation• Investigation of illegal transmitter / illegal acts
Participation of major events
Spectrum Monitoring
Tasks
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Deployment of national space monitoring network
Beijing
Shenzhen
Urumqi
China
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Facilities and staffs
Fixed stations Geolocationsystems
Mobile stations
Portable equipment
3 42 925
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Staffs
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Monitoring coverage
Beijing
Shenzhen
0°E 180°E44°E
10°E~180°E
Urumqi
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• Monitoring band• GSO satellite in L/S/X/C/Ku/Ka band
• NGSO satellite in L/S/X band
• RF Parameter measurement• Frequency, bandwidth, power, PFD, EIRP, symbol rate and modulation
• Satellite orbit and spectrum occupancy measurement
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Monitoring Capability
1. Spectrum parameter and occupancy measurement
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• Monitoring band
• GSO satellites in C/Ku band
• Geolocation principle• TDOA/FDOA algorithm with two satellites
• TDOA/TDOA algorithm with three satellites
• Geolocation performance• Location accuracy: ≤10km
• Operating time: ≤30 min
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Monitoring Capability
2. Geolocation
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Harmful interference02
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Interference Types
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Interference Sources
4 35
298
43 23
75 33 36
0
50
100
150
200
250
300
350
2012 2013 2014 2015
The amount of Satellite Interferences in 2012‐2015
interference from VSAT interference from traditional earth station
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• Emitting frequency, bandwidth, power change with no regularity
• Emitting duration and time are normally short, typically from 10 min to 2 hours
• Emitter established both in fixed place and mobile vehicle
• Emitters placed in different cities with different locations
• No relations between emitting frequency and emitter location
• Huge amount of interference carriers and locations
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Characteristics of Interference from VSAT network
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Trends and Question03
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• Widely use of HDFSS service in Ka band, which installed numerous micro‐earth stations with small diameter (less than 30 centimeter) that may easily cause interferences and hardly manage on licensing
• WRC‐19 Issue 9.1.7: Studies towards unauthorized operation of earth station terminals
• In the event of an interference case involving unauthorized terminals
• what roles should ITU, satellite operator, administration, inspection department and spectrum monitoring department play?
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Continuously increased difficulties in geolocation and interference elimination
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• According to the characteristics of unauthorized VSAT networks, it has hardly enough time for geolocation and interference elimination
• Difficulty in geolocation, because several interference appears simultaneously and the interference frequency changes arbitrarily
• Difficulty in ground search of interference emitter, because of the short duration of the interference and constantly changing of the emitter location
• In the event of an interference case involving VAST networks
• Is the traditional geolocation methods, like TDOA/FDOA with 2 satellites in C/Ku band, still suitable for geolocation in Ka band?
• Is there some alternative solutions to get the interference location much quicker instead of geolocation?
• Is there some effective solutions for interference elimination and enforcement?51
Continuously increased difficulties in geolocation and interference elimination
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