Study on feasibility of SATCOM for railway communication

Final Report
Thuraya
Criterion ID Criterion Evaluation Justification
CRT-TECH-19
The proposed satcom system shall provide high level of
security in the information exchanged.
NC
Table 57: Thuraya assessment
Thuraya, just like most of the commercial satcom solutions, do not provide
mechanisms to prevent intentional attacks and/or RF interferences.
C.5.1
C.5.1.1
Additional information useful for the assessment
Delay study
Since this system is based on a GEO satellite operating with an L-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.
Thuraya can provide data communications up to 60 kbps downlink and 15 kbps uplink. Therefore, in this example we assume a transmission data rate in
the return link of 15 kbps. To calculate the transmission time the following approximation is done:
Where,
T tx is the transmission time for a given packet
T up is the propagation delay from ground to the overhead satellite
T down is the propagation time from the satellite to the ground
In order to provide an example, following data is assumed:
Data packet: 120 bytes
Doc.Nº: SRAIL-FNR-010-IND
Edit./Rev.: 1/1
Date: 16/02/2017
Page 247 of 285