ANNEX I CRequirements for construction, testing, installation, and inspection
POSITIONING BASED ON GLOBAL NAVIGATION SATELLITE SYSTEM (GNSS)
4.VEHICLE UNIT WITH AN EXTERNAL GNSS FACILITY
4.1.Configuration
4.1.1Main components and interfaces
In this configuration, the GNSS receiver is a part of the external GNSS facility.
GNS_8
The external GNSS facility must be powered with a specific vehicle interface.
GNS_9The external GNSS facility shall consist of the following components (see Figure 4):
- (a)
A commercial GNSS receiver to provide the position data through the GNSS data interface. For example, the GNSS data interface can be NMEA standard V4.10 where The GNSS receiver acts as a talker and transmit NMEA sentences to the GNSS Secure Transceiver with a frequency of 1Hz for the pre-defined set of NMEA sentences, which must include at least the RMC and GSA sentences. The implementation of the GNSS data interface is a choice of the manufacturers of the external GNSS facility.
- (b)
A transceiver unit (GNSS Secure Transceiver) with the capability to support standard ISO/IEC 7816-4:2013 (see 4.2.1) to communicate with the vehicle unit and support the GNSS data interface to the GNSS receiver. The unit is provided with a memory to store the identification data of the GNSS receiver and external GNSS facility.
- (c)
An enclosure system with tamper detection function, which encapsulate both the GNSS receiver and the GNSS Secure Transceiver. The tamper detection function shall implement the security protection measures as requested in the Protection Profile of the Smart Tachograph.
- (d)
A GNSS antenna installed on the vehicle and connected to the GNSS receiver through the enclosure system.
GNS_10The external GNSS facility has at least the following external interfaces:
- (a)
the interface to the GNSS antenna installed on the vehicle truck, if an external antenna is used.
- (b)
the interface to the Vehicle Unit.
GNS_11
In the VU, the VU Secure Transceiver is the other end of the secure communication with the GNSS Secure Transceiver and it must support ISO/IEC 7816-4:2013 for the connection to the external GNSS facility.
GNS_12
For the physical layer of the communication with the external GNSS facility, the vehicule unit shall support ISO/IEC 7816-12:2005 or another standard able to support ISO/IEC 7816-4:2013. (see 4.2.1).