Study on feasibility of SATCOM for railway communication

Final Report
GEO / X-band
Criterion ID Criterion Evaluation Justification
CRT-TECH-15
CRT-TECH-16
CRT-TECH-17
CRT-TECH-18
The proposed satcom system shall be flexible to support (at
least) new created apps in the future.
The proposed satcom system shall be highly and easily
scalable.
The proposed satcom system shall allow the use of the
following types of terminals: “On-board (mobile)”, “Handheld”
and “Fixed”.
The proposed satcom system shall provide high level of safety
in the information exchanged.
C (High)
C
PC
C (High)
DVB-S2X/RCS2+M standards have been designed to provide high level of
flexibility with lots of modcods and bandwidth channelization. Therefore, this
GEO/X-band system based on these standards can be considered highly flexible,
enabling higher modcods that increase the efficiency of the system.
This solution can offer high scalability by means of techniques such as multi-beam
and frequency reuse.
Handhelds are not available for GEO satellites on X-band.
DVB-S2X/RCS2+M standards can provide techniques for safety purposes, such
as diversity, enhanced FECs, fast signal acquisition… Therefore, this GEO/X-band
solution can make use of these mechanisms to provide the level of safety
required.
CRT-TECH-19
The proposed satcom system shall provide high level of
security in the information exchanged.
NC
Commercial standards such as DVB-D2X/RCS2+M are not implementing specific
functionalities to counteract intentional interferences effects on the L1 and L2.
Table 60: GEO / X-band (DVB-S2X and DVB-RCS2 CS) assessment
C.8.1
C.8.1.1
Additional information useful for the assessment
Delay study
Since this system is based on a GEO satellite operating with an low frequency band (X-band), the theoretical delay expected is very similar to the one
calculated with the Inmarsat 4 system. Therefore, see section §C.3.1.1 for more details.
Doc.Nº: SRAIL-FNR-010-IND
Edit./Rev.: 1/1
Date: 16/02/2017
Page 263 of 285