Space Radiocommunication Services and Frequency Allocations Dr. Francis Lau Dr. Francis CM Lau, Associate Professor, EIE, PolyU 1 Space Radiocommunication Services • Fixed Satellite Service (FSS) • Mobile Satellite Service (MSS) – Maritime Mobile Satellite Service (MMS) – Aeronautical Mobile Satellite Service (AMS) – Land Mobile Satellite Service (LMS) • Broadcasting Satellite Service (BSS) • Earth Exploration Satellite Service (EES) Dr. Francis CM Lau, Associate Professor, EIE, PolyU 2 Space Radiocommunication Services • Space Research Service (SRS) • Space Operation Service (SOS) • Radiodetermination Satellite Service (RSS) • Inter-Satellite Service (ISS) • Amateur Satellite Service (ASS) Dr. Francis CM Lau, Associate Professor, EIE, PolyU 3 Space Radiocommunication Services Type of link Applications Space radio- (•= uplink, communications ¯= downlink) services Broadcasting ¯ Time signals FSS Data BSS Sound programs BSS Television programmes BSS Links with •¯ Land MSS (LMS) mobiles Maritime MSS (MMS) Aeronautical MSS (AMS) Radio location •¯ Navigation RSS Downlink ¯ Radiolocation and RSS transmission navigation of a radio Earth atmosphere SRS, EES beacon monitoring Dr. Francis CM Lau, Associate Professor, EIE, PolyU 4 Frequency Allocations • Frequency allocations to a given service can depend on the region – Region 1: Europe, Africa, the Middle East and the countries of the former USSR – Region 2: The Americas – Region 3: Asia except the Middle East and the countries of the former USSR, Oceania • bands allocated can be exclusive or shared Dr. Francis CM Lau, Associate Professor, EIE, PolyU 5 Frequency Allocations • Fixed satellite service links – C band or 6/4 GHz • around 6GHz for the uplink and around 4GHz for the downlink • occupied by the oldest systems and tend to be saturated – X band or 8/7 GHz • reserved for government use Dr. Francis CM Lau, Associate Professor, EIE, PolyU 6 Frequency Allocations • Fixed satellite service links – Ku band or 14/12 GHz • current operational developments – Ka band or 30/20 GHz • raising interest due to large available bandwidth and little interference due to present little use Dr. Francis CM Lau, Associate Professor, EIE, PolyU 7 Frequency Allocations • Mobile satellite service links – L band or 1.6/1.5GHz • around 1.6 GHz for the uplink and 1.5GHz for the downlink • Broadcasting Satellite Service links – contain only downlinks using bands around 12 GHz – uplink belongs to the Fixed-Satellite Service • a feeder link Dr. Francis CM Lau, Associate Professor, EIE, PolyU 8 Frequency Allocations Frequency allocations Typical frequency bands for Radiocommunications service Uplink / Downlink Usual terminology Fixed satellite service (FSS) 6 / 4 GHz C band 8 / 7 GHz X band 14 / 12 – 11 GHz Ku band 30 / 20 GHz Ka band Mobile satellite service (MSS) 1.6 / 1.5 GHz L band 30 / 20 GHz Ka band Broadcasting satellite service (BSS) 12 GHz Ku band Dr. Francis CM Lau, Associate Professor, EIE, PolyU 9 Conclusions • various space radiocommunication services have been defined as transmission and/or reception of radio waves for specific telecommunication applications • frequency allocations to a given service can depend on the region • bands allocated can be exclusive or shared Dr. Francis CM Lau, Associate Professor, EIE, PolyU 10.