Study on feasibility of SATCOM for railway communication

Final Report
GEO / L-band + ANTARES CS (IRIS FOC)
Criterion ID Criterion Evaluation Justification
CRT-TECH-16
CRT-TECH-17
CRT-TECH-18
CRT-TECH-19
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.
The proposed satcom system shall provide high level of
security in the information exchanged.
C (Low)
PC
C (High)
NC
Table 56: GEO / L-band based on ANTARES CS (IRIS FOC) assessment
ANTARES CS can make use of different techniques (such as channelisation of
200 kHz or frequency reuse) to offer scalability (but considering intrinsic limitations
of the L-band).
Handhelds were not taken into account in the ANTARES communication standard
definition. Therefore, handhelds are not supported.
This standard was designed in order to meet the stringent safety requirements for
the ATM applications.
This standard is not implementing specific functionality to tackle the intentional
interferences effect on the L1 and L2.
C.4.1
C.4.1.1
Additional information useful for the assessment
Delay study
Since this solution is based in a GEO satellite, the main part of the transmission delay will be the propagation delay between terminal and satellite and
vice-versa. Therefore, the following approximation is done:
Where,
T tx is the transmission time for a given packet
T rx is the reception time for a given packet
Doc.Nº: SRAIL-FNR-010-IND
Edit./Rev.: 1/1
Date: 16/02/2017
Page 242 of 285