Presentation is loading. Please wait.

Presentation is loading. Please wait.

1 FIXED SATELLITE SERVICE and UAS (22 September 2010) ACP WGF23/IP26 Abdolmajid Khalilzadeh.

Similar presentations

Presentation on theme: "1 FIXED SATELLITE SERVICE and UAS (22 September 2010) ACP WGF23/IP26 Abdolmajid Khalilzadeh."— Presentation transcript:

1 1 FIXED SATELLITE SERVICE and UAS (22 September 2010) ACP WGF23/IP26 Abdolmajid Khalilzadeh

2 2 COMMERCIAL SATELLITES The FSS may be able to fulfill the UAS spectrum requirements without the need for a new AMS(R)S allocation Existing commercial FSS systems at Ku and Ka- band offer immediate access to spectrum for UAS ITU-R studies have shown that the commercial Ku/Ka bands can support UAS control links and meet the desired UAS link availability.

3 3 UAS OPERATING UNDER FSS Requires modification of ITU Radio Regulations to permit UAS to communicate with a FSS satellite Requires a WRC Resolution that contains the UAS technical and regulatory requirements The performance, responsibilities and liabilities of the FSS and UAS operators would be specified in a commercial contract UAS would not be operating under the AMS(R)S service allocation, but rather as an FSS application

4 4 Space-to-Earth Direction – GHz – GHz – GHz (Region 2) – GHz (Region 3) – GHz (Regions 1 and 3) Earth-to-Space Direction – GHz Non-Planned Ku Band FSS Frequencies

5 5 Non-Planned Ka Band FSS Frequencies Space-to-Earth Direction – GHz (Region 1) – GHz – GHz Earth-to-Space Direction – GHz – GHz

6 6 SATELLITE CHARACTERISTICS Long lifetime ( 15 years) Low satellite and transponder failure rates High EIRP and G/T levels over large geographic areas Well suited for links that utilize small transmit/receive antennas High radio link availability Connectivity over large geographic areas, which terrestrial links cannot provide Multiple transponders are available on each satellite, e.g. 24 Ku-band 36 MHz transponders Bandwidths typically range from 24 to 120 MHz – the most common bandwidth being 36 MHz

7 7 Uplink Coverage Downlink Coverage SATELLITE COVERAGE Note: This is an example coverage map; actual coverage varies depending on actual satellite design.

8 8 COMMERCIAL SATELLITE CAPACITY TRANSPONDER LEASING –Customer can lease all or portion of a transponder –Transponder can be leased on a non-premptible basis Carrier cannot be moved to restore another carrier BACK-UP CAPACITY –Due to large number of satellites and transponders, back-up (bandwidth) capacity can be provided. Back-up capacity available on the same satellite Back-up capacity available on another satellite

9 9 LINK DEGRADATION A satellite link can be degraded by two primary sources –Atmospheric effects –Adjacent satellite interference Typical commercial satellite link availabilities range from 99.50% to 99.96%

10 10 ADJACENT SATELLITE INTERFERNCE A satellite link is subject to interference from the transmissions of other co- frequency satellite networks Interference can occur in the Earth-to- space direction or in the space-to-Earth direction. Adjacent satellite interference are managed through ITU coordination.

11 11 Note: 2 º orbital separation is typical of the separation between adjacent satellites ADJACENT SATELLITE INTERFERNCE ES1ES2ES A C B D SAT 1SAT 2SAT 3 UA E F G H 2º±0.05º I J

12 12 COORDINATION Satellite operators coordinate the maximum power and EIRP density level of their transmissions, the off-axis gain characteristics of their antennas and the placement of any high power density carriers, e.g. TV/FM –A known and stable interference environment –Links are designed to withstand the expected interference Internationally, coordination agreements are contained in a formal document that is approved by the involved satellite operators and their respective administrations Domestically, a formal agreement may or may not be required – depends on the regulations of each administration

13 13 ATMOSPHERIC DEGRADATION Rain is the primary atmospheric source of link degradation at Ku and Ka-band frequencies The effects of rain can be overcome in various ways –Increasing carrier power level –Changing the carrier modulation & FEC scheme –Increasing the transmitting and/or receiving antenna size Typical commercial Ku-band link availabilities range from 99.50% to 99.96%

14 14 At some point in time, links will degrade or drop-out for various reasons UAS systems need to incorporate hardware redundancy UAS systems need to incorporate spectrum redundancy –Capacity –Frequency UAS REDUNDANCY

Download ppt "1 FIXED SATELLITE SERVICE and UAS (22 September 2010) ACP WGF23/IP26 Abdolmajid Khalilzadeh."

Similar presentations

Ads by Google