NAVISAT Middle East & Africa
1) NAVISAT System description 2) NAVISAT and worldwide estimated spectrum requirements for AMS(R)S3) Views on WRC-12 Agenda item 1.7 Summary
1) NAVISAT System description • NAVISAT is a satellite aeronautical communications and navigation system planned to cover the Africa and Middle East region. The NAVISAT system is expected to start its operations in 20/3/2014. • For the Africa and Middle East region, a key driver is to fulfil the numerous AMS(R)S communication gaps with a global coverage aimed at increasing safety.
NAVISAT satellite beams configuration in L-band 6 spot beams and 1 global beam to cover Africa, Middle-East and oceanic surrounding areas
2) Estimated spectrum requirements for AMS(R)S for NAVISAT EGYPT document 4C/487: 1) Assumptions made in the ITU studies need to be representative of all planned regional systems. 2) Explains Region 1 global estimated spectrum requirements for AMS(R)S, not only driven by European requirements (ESA documents 333 and 424derive figures of 3.3 MHz (forward link) and 1.3 MHz (return link)). 3) It also clarifies some assumptions for the Africa and Middle East region, and concludes that the European requirements may be too optimistic when considering the planned regional systems; EGYPT document 4C/394.
The elements, identifying differences in approaches between the documents 4C/ 333,424 and 4C/394, leading to different spectrum requirements for the Africa and Middle East Region: • Aircraft count: different approaches have been taken for aircraft count estimates, as well as traffic growth projections. • Service level: NAVISAT service portfolio is extracted from the COCR. In ESA estimates, the concepts of operation made for Europe have been assumed valid for the Africa and Middle East Region. • Complementarities with terrestrial systems: NAVISAT provides service in areas not served by VHF. • Communication standard: NAVISAT spectrum estimates assume the use of Classic Aero standard.
Estimated NAVISAT Spectrum Requirements* (Year 2027) * NAVISAT is to be launched in 2013/2014 and will therefore rely on existing technologies and standards.
Worldwide estimated spectrum requirements for AMS(R)S are 4.8 MHz (forward link) and 1.8 MHz (return link), which is less than 2*10 MHz anyway. Estimated Spectrum Requirements (Year 2027)
3) WRC-12 Agenda Item 1.7 WRC-12 Agenda item 1.7 is seen as a key to achieve spectrum access for AMS(R)S communications over the Africa and Middle East region. NAVISAT overall objective: • AMS(R)S should remain in L-band; no other allocation should be considered under AI 1.7.This can be achieved while retaining MSS allocation and avoid putting undue constraints on existing systems. • Develop regulatory solutions which ensure priority spectrum access for the AMS(R)S within the bands 1545-1555 MHz and 1646.5-1656.5 MHz as per RR No. 5.357A, in accordance with justified spectrum requirements. This is optimum achieved by a modification of ITU-R Resolution 222 to ensure priority of AMS(R)S in the 2*10MHz is met at coordination level.
to satisfy the Agenda Item, the relevant solution outlines: • Remove reported difficulties and deficiencies that memberships encountered in implementation of Resolution 222 (WRC-7). • Invite ICAO to the process of determining yearly AMS(R)S communications requirements. • Used as basis for deriving AMS(R)S spectrum requirements. • Instruct Administration of AMS(R)S systems to also oversee the process of estimating spectrum requirements for AMS(R)S systems. • Instruct Administrations of MSS systems taking part in the MLM/ORM process, to give priority access to AMS(R)S spectrum requirements as validated by ICAO. In case ORM does not achieve any agreement, then the Administrations taking part in the ORM/MLM shall make spectrum available to the AMS(R)S requirements as validated by ICAO.