Presentation on theme: "1 FIXED SATELLITE SERVICE and UAS (22 September 2010) ACP WGF23/IP26 Abdolmajid Khalilzadeh."— Presentation transcript:
1 FIXED SATELLITE SERVICE and UAS (22 September 2010) ACP WGF23/IP26 Abdolmajid Khalilzadeh
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 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 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 Non-Planned Ka Band FSS Frequencies Space-to-Earth Direction – GHz (Region 1) – GHz – GHz Earth-to-Space Direction – GHz – GHz
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 Uplink Coverage Downlink Coverage SATELLITE COVERAGE Note: This is an example coverage map; actual coverage varies depending on actual satellite design.
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 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 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 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 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 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 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