1

Report to CCSDS/PlaCom on SFCG/LMSG work progress

Reply to SLS-PCOM AI-05 of Spring’11 Meeting

Jean-Luc Gerner JLG Consulting/CNES

Member of SFCG

2

Report to CCSDS/PlaCom on SFCG/LMSG work progressWithin the SFCG, the Lunar-Mars Spectrum Group (LMSG) has the following TORs (RES A-26-1):

3

Report to CCSDS/PlaCom on SFCG/LMSG work progress

The LMSG met on 8th June 2011, at the yearly meeting of the SFCG. The work concentrated on the review of three input documents:

31-18/D (NASA) DRAFT NEW REPORT: COMPATIBILITY STUDIES FOR COMMUNICATIONS IN THE LUNAR REGION

31-43/D (CNES) FREQUENCIES CONSIDERATION FOR COMMUNICATIONS IN THE LUNAR REGION

31-19/D (NASA) FREQUENCY ASSIGNMENT GUIDELINES FOR COMMUNICATIONS IN THE LUNAR REGION

4

Report to CCSDS/PlaCom on SFCG/LMSG work progress

31-18/D (NASA) DRAFT NEW REPORT: COMPATIBILITY STUDIES FOR COMMUNICATIONS IN THE LUNAR REGION

This document provided a consolidated SFCG baseline lunar communications service requirement. A compatibility study for identified lunar surface and Earth-based communication requirements, using the baseline service requirements, was included in this document.

The LMSG considered that more work is needed to further mature the content of this proposed report. A new action item was agreed to capture this point.

5

Report to CCSDS/PlaCom on SFCG/LMSG work progress

31-43/D (CNES) FREQUENCIES CONSIDERATION FOR COMMUNICATIONS IN THE LUNAR REGION

This input document provided technical basis for Mobile Satellite Service (MSS) downlink S-Band 2483.5 – 2500 MHz and MSS uplink L-Band 1610 – 1626.5 MHz as suitable in the Lunar vicinity, for Orbit to Surface and Surface to Orbit communications. The LMSG agreed to incorporate these new bands under section 3.0 of the SFCG baseline lunar communications service requirements. This baseline will be used as a starting point for the new action item.

6

Report to CCSDS/PlaCom on SFCG/LMSG work progress

31-19/D (NASA) FREQUENCY ASSIGNMENT GUIDELINES FOR COMMUNICATIONS IN THE LUNAR REGION

This input contribution was proposing language for a SFCG recommendation on frequency usage for the lunar region based on multi-agency mission plans. Discussion and review of this document concluded that additional compatibility analysis is required to provide defined usage guidelines for each frequency bands, especially the non-SRS bands with special consideration of passive sensing protection and active sensing operations in the Lunar Region. The LMSG agreed to incorporate forward work into the new action item for the lunar region.

7

Report to CCSDS/PlaCom on SFCG/LMSG work progress

SFCG New Action Item (AI 31-09)

SFCG developed a new AI under the subject of Radio Communication Frequency Allocation in the Lunar RegionThe AI is split into 4 subactions:1. Define system characterisctics for each type of link

as per table beside2. Conduct compatibility analysis for non-SRS bands

between lunar vicinity/surface operations and existing/allocated services and earth-based operations.

3. Evaluate each recommended frequency band w.r.t. the protection of the SZM

4. Submit a draft recommendation on frequency usage for the lunar region to SFCG-32

8

Report to CCSDS/PlaCom on SFCG/LMSG work progress

A draft recommendation is attached to the AI, as working material, with the following draft recommends:

Table 1 provides recommended frequency bands and Table 2 lists lunar services baseline requirements.

9

10

11

Report to CCSDS/PlaCom on SFCG/LMSG work progress

12

Report to CCSDS/PlaCom on SFCG/LMSG work progress

13

14

15

Report to CCSDS/PlaCom on SFCG/LMSG work progress

Conclusion

SFCG has put in place the Lunar/Mars Spectrum Group to work at :

Identifying spectrum needs for future radio communication operations in the lunar region

Selecting suitable frequency bands to cover these needs For the SRS bands, ensuring pre-coordination of their use For non-SRS bands, ensuring that there is no risk of interfering

into the Earth based users of these bands Evaluating each recommended frequency band w.r.t. the

protection of the SZM

CCSDS has the competence to contribute to this work

CNES has indicated intention to progress on surface-orbit coms and report to CCSDSAny other agency volunteering?

16

Report to CCSDS/PlaCom on SFCG/LMSG work progress

BACK-UP SLIDE

CNES STUDIES

17

Report to CCSDS/PlaCom on SFCG/LMSG work progress

Design choices for future planetary in-situ communication systems:

•Lean wherever possible upon development of terrestrial systems

• E.g. Wimax for surface coms

• E.g. MSS for surface-orbit coms

• Identify necessary adaptations to the specific needs of planetary coms

CNES approach is to lean upon Globalstar MSS system design and technologies for surface-orbit coms

CNES demonstrated that a Globalstar-like system in the lunar region would not interfer into the existing Globalstar system

Further work is needed to:

•Consolidate surface-orbit coms requirements

•Design a surface-orbit coms system maximizing the reuse of terrestrial technologies, with special focus in this case on Globalstar MSS

•Confirm no-interference into terrestrial system