Link Type: Position Location Interface

Location and Time Data Source --> ITS Roadway Equipment:
location and time

Definitions

location and time (Information Flow): The current geographic location in three dimensions (latitude, longitude, elevation) and the current time.

Location and Time Data Source (Source Physical Object): The 'Location and Time Data Source' provides accurate position information. While a Global Positioning System (GPS) Receiver is the most common implementation, this physical object represents any technology that provides a position fix in three dimensions and time with sufficient accuracy.

ITS Roadway Equipment (Destination Physical Object): 'ITS Roadway Equipment' represents the ITS equipment that is distributed on and along the roadway that monitors and controls traffic and monitors and manages the roadway. This physical object includes traffic detectors, environmental sensors, traffic signals, highway advisory radios, dynamic message signs, CCTV cameras and video image processing systems, grade crossing warning systems, and ramp metering systems. Lane management systems and barrier systems that control access to transportation infrastructure such as roadways, bridges and tunnels are also included. This object also provides environmental monitoring including sensors that measure road conditions, surface weather, and vehicle emissions. Work zone systems including work zone surveillance, traffic control, driver warning, and work crew safety systems are also included.

Included In

This Triple is in the following Service Packages:

This Triple is in the following Functional Objects:

This Triple is described by the following Functional View Data Flows:

Communication Solutions

  • GNSS Data - GNSS serial interface (6)
Solutions are sorted in ascending Gap Severity order. The Gap Severity is the parenthetical number at the end of the solution.

Selected Solution

GNSS Data - GNSS serial interface

Solution Description

This solution is used within Australia, the E.U. and the U.S.. It combines standards associated with GNSS Data with those for GNSS serial interface. The GNSS Data standards include upper-layer standards required to obtain location and time information from a satellite-positioning-system-based geolocation receiver. The GNSS serial interface standards include lower-layer standards that support communications between connected ITS equipment and geolocation equipment such as a GPS receiver.

ITS Application Entity

NMEA 0183
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Mgmt

No Standard Needed
Facilities

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Security
Mind the gap

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TransNet

NMEA 0183
Access
Mind the gap

NMEA 0183
TransNet TransNet

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ITS Application ITS Application

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Facility Facility

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Security Security

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Note that some layers might have alternatives, in which case all of the gap icons associated with every alternative may be shown on the diagram, but the solution severity calculations (and resulting ordering of solutions) includes only the issues associated with the default (i.e., best, least severe) alternative.

Characteristics

Characteristic Value
Time Context Now
Spatial Context Adjacent
Acknowledgement False
Cardinality Broadcast
Initiator Source
Authenticable True
Encrypt False

Security

Information Flow Security
  Confidentiality Integrity Availability
Rating Low High High
Basis Time reference and location information for Field devices should be observable. There is no reason to obfuscate. Location and time data is the basis for safety and a host of other applications. Corruption of this flow could lead directly to a vehicle accident. If this information is not available, applications depending on this information will not function properly.


Security Characteristics Value
Authenticable True
Encrypt False