[CESG] SLS Area input for the CCSDS Strategic Plan

[Gian.Paolo.Calzolari at esa.int]

Dear All,
        here below the SLS Area input for the CCSDS Strategic Plan.
Best regards

Gian Paolo
--------------------------------------------------------



Strategic Plan of the Consultative Committee for Space Data Systems

5.  SPACE LINK SERVICES AREA

The objective of the Space Link Services (SLS) Area is to address all of 
the point-to-point communications links and protocols that interconnect a 
spacecraft with its ground support system, or with another spacecraft by 
developing standards for efficient space link communications systems. 
Specific attention is given by SLS to needs for higher data rates, better 
link performances, together with lower cost, mass and power and higher 
security.

SLS area objectives concentrate on layers 1 & 2 (of OSI protocol stack), 
namely: RF & Modulation, Channel Coding and Data Link layer, for both 
long-haul (e.g. spacecraft to ground) and proximity links (e.g. orbiter to 
lander) and on two additional functions essential on the space link: data 
compression for end to end data transfer optimization, and ranging for 
accurate orbit determination.

The strategic goals of the SLS Area are:

a       By 2015: to finalize standardization of Low-density Parity-Check, 
Serially Concatenated Convolutional and DVB-S2 coding schemes with high 
power and spectral efficiency, and with low residual frame and bit error 
rates for telemetry applications producing standards and supporting Green 
books.
b       By 2014: to produce a Next Generation Uplink Green book providing 
the high level system view and associated performance requirements to 
allow starting the definition and development of new recommendations 
complementing the current Telecommand (TC) Standard. 
c       By 2017: to develop new synchronization and channel coding schemes 
to be used with the Telecommand (TC) Space Data Link Protocol over 
ground-to-space communications links improving performance in term of 
distance and data rate.
d       By 2020: to develop standards for Erasure Correcting Codes for 
Near Earth and Deep Space communications to provide efficient 
countermeasures for guaranteeing reliable communications even at low 
signal-to-noise ratio regimes when conventional channel coding may fail to 
provide down/up-link reliability and especially when ARQ strategies are 
not feasible, 
e       By 2014: to develop a set of recommended modulation schemes for 
26GHz Earth Exploration satellites.
f       By 2014: to create a standard enabling the simultaneous 
transmission of high rate telemetry and ranging signals.
g       By 2016: to develop standards on Multiple Spacecraft Per Aperture 
(MSPA) techniques, on 22 GHz modulations and on emergency communications. 
h       By 2017: to develop recommendations for higher-order modulations 
for deep space applications.
i       By 2014: to refurbish the Proximity-1 Protocol suite (including 
Physical Layer, Coding & Synchronization Sublayer, and Data Link Sublayer 
) and concurrently update the related Proximity-1 Green book.
j       By 2014:  to update the services of the Telemetry, Telecommand 
(TC) and AOS data link protocols to incorporate interfaces to Space Data 
Link Security functions; 
k       By 2018: to develop a new Space Data Link Protocol integrating the 
best features of TM, TC, AOS, and Proximity-1 and providing a common link 
layer transfer frame format able to satisfy future space data link needs.
l       By 2014: to provide a standard providing security services 
(authentication, integrity and/or confidentiality) to TM/TC space-ground 
links using TM, TC or AOS data link protocols.
m       By 2016: to develop a standard providing key management, secure 
links monitoring & control, and security associations management for TM/TC 
space-ground links using TM, TC or AOS data link protocols.
n       By 2015:  to collect Agency requirements for short-haul radio 
links and protocols for in-situ communication of landed element on e.g. 
Moon, Mars, etc.
o       By 2020: to develop standards for in-situ communication of landed 
element on e.g. Moon, Mars, etc.
p       To create new standards for optical links (ISO layers 1&2) with 
the targets below and support other areas as needed in adapting/creating 
standards for e.g. service management, higher layers protocols, best 
practices, ? to accommodate optical communications needs.
i.      By 2018 agree the basic characteristics of optical terminals;
ii.     By 2020 develop standards for modulation and coding for return 
links;
iii.    By 2020 identify new optical communication-specific data link 
protocols to be developed for optimizing communications over optical 
links.
iv.     By 2020 identify and define if necessary standards for data 
exchange of forecasts and meteorological data from ground sites relevant 
for optical communication.
v.      By 2025 develop standards for combinations of modulation and 
coding for channel-dependent effects considering e.g., first VCM and then 
ACM techniques;
vi.     By 2025 develop standards for modulation and coding for forward 
links.
q       By 2015: to create a standard for a 1D spectral transform to be 
used as a pre-processing spectral decorrelation stage to provide effective 
lossy compression of multispectral & hyperspectral imagery when used with 
the existing (2D) image compressor.
r       By 2020: to create a standard that provides effective 
low-complexity lossless, near-lossless, and region-of-interest (ROI) 
capabilities for multispectral and hyperspectral imagery.
s       By 2023: Identify requirements and define standards for on-board 
compression of Synthetic Aperture Radar (SAR) data.


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