M00001613
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ISO 20207 1st Edition, August 15, 2015 Space data and information transfer systems - CCSDS Space Link Protocols over ETSI DVB-S2 Standard
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Availability date: 07/13/2021
Description / Abstract:
The DVB-S2 standard (reference [1]) proposes advanced modulation
techniques (QPSK, 8PSK, 16APSK, and 32APSK) and a wide range of
coding rates (from 1/4 to 9/10) with near-Shannon coding schemes
(LDPC codes). This high number of modulation and coding schemes
allows a wide range of possibilities to satisfy specific mission
constraints.
Moreover, to maximize the telemetry system throughput, it
appears possible to adapt the transmitted waveform (and the useful
data rate) to the variable conditions of the link. The DVB-S2
standard can actually implement Variable Coding and Modulation
(VCM) mode, which adapts the transmission scheme to the channel
conditions following a predetermined schedule (for example,
following a dynamic link budget). When a channel is available to
provide feedback (e.g., via a telecommand link), the transmission
scheme can be dynamically adjusted using the Adaptive Coding and
Modulation (ACM) mode.
The use of the DVB-S2 standard for telemetry makes possible the
use of generic Very High Scale Integrated Circuits (VHSIC) Hardware
Description Language (VHDL) Intellectual Property (IP) modules for
developments. The use of a widely implemented standard simplifies
finding transmitting or receiving equipment to check compatibility.
Finally, for the ground part, some telecom DVB-S2 receivers or
Application Specific Integrated Circuits (ASICs) developed for the
telecom market could be reused.
This Recommended Standard is an adaptation profile describing
how to use the DVB-S2 standard to transmit CCSDS Transfer Frames
for telemetry purpose. The interface between CCSDS and DVB-S2 is
based on the Attached Synchronization Marker (ASM) and Channel
Access Data Unit (CADU) already introduced in reference [2].
DVB-S2 is used in this adaptation profile as a complete and
self-sufficient standard, and definitions and specifications taken
from DVB-S2 are applicable only in the context of this Recommended
Standard. However, individual DVB-S2 functions or components (e.g.,
VCM/ACM, 8-PSK, and higher-order modulations) might be reused,
redefined, and/or respecified by CCSDS in future Recommended
Standards.
PURPOSE
The purpose of this document is to define a recommended
interface between CCSDS Space Link Protocols (references [3] and
[4]) and the DVB-S2 telecom standard (reference [1]), and to
recommend options of the DVB-S2 standard suited to high data rate
telemetry applications, such as Earth Exploration Satellite
Services (EESS) payload telemetry.
APPLICABILITY
This Recommended Standard applies to the creation of Agency
standards and to data communications over space links between CCSDS
Agencies in cross-support situations for near Earth Exploration
Satellite Services (EESS) payload telemetry. This Recommended
Standard includes comprehensive specification of the data formats
and procedures for inter- Agency cross support. It is neither a
specification of, nor a design for, real systems that may be
implemented for existing or future missions.
The Recommended Standard specified in this document is to be
invoked through the normal standards programs of each CCSDS Agency
and is applicable to those missions for which cross support based
on capabilities described in this Recommended Standard is
anticipated. Where mandatory capabilities are clearly indicated in
sections of this Recommended Standard, it is mandatory to implement
them when this document is used as a basis for cross support. Where
options are allowed or implied, implementation of these options is
subject to specific bilateral cross-support agreements between the
Agencies involved.