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Guides
  1. HD GNSS Positioning API Developer Guide
  2. Appendices

HERE HD GNSS Positioning API Terminology

  • ADR - Accumulated Delta Range, GNSS carrier phase measurement.
  • Beidou - Global navigation satellite system operated by China.
  • Galileo - Global navigation satellite system operated by the European Union.
  • Glonass - Global navigation satellite system operated by Russia.
  • GNSS - Global Navigational Satellite System. An umbrella term for all satellite systems like GPS, Galileo, Glonass and Beidou.
  • GNSS measurements - The raw data provided by a GNSS receiver for visible satellites. The exact contents and the data format may vary by used GNSS receiver.
  • GPS - Global Positioning System operated by the United States.
  • HD GNSS - High Definition GNSS, a HERE product providing PPP positioning.
  • HRN - HERE Resource Name, a unique identifier for a HERE platform resource.
  • ITRF2014 - International Terrestrial Reference Frame, widely used coordinate frame for high precision navigation systems. Difference between ITRF2014 and WGS-84 is roughly a centimeter.
  • JSON - JavaScript Object Notation
  • MQTT - Message Queuing Telemetry Transport, widely used transport protocol.
  • MQTTS - Message Queuing Telemetry Transport Secured, TLS secured version of the MQTT protocol.
  • MSM - Multiple Signal Message, types of messages defined in the RTCM v3.x protocol that carry the GNSS measurements.
  • PPP - Precise Point Positioning, positioning technique of the HD GNSS product. PPP requires GNSS carrier phase measurements.
  • Positioning session - Stateful client specific session on cloud to resolve position.
  • Protobuf - Google's language-neutral, platform-neutral, extensible mechanism for serializing structured data.
  • QoS - Quality of Service, guarantee of delivering a message supported by MQTT protocol.
  • RTCM - Radio Technical Commission for Maritime Services, used to refer to the communications protocol defined by RTCM standard 10403.x (RTCM v3.x).
  • SNR - Signal to Noise Ratio, measured signal strength.
  • SPP - Single Point Positioning, the regular GNSS positioning method. SPP does not require GNSS carrier phase measurements but relies on GNSS code measurements.
  • TLS - Transport Layer Security.
  • UUID - Universal Unique Identifier, a 128-bit value used to uniquely identify an object or entity on the internet.
  • WGS-84 - World Geodetic System defines an Earth-centered, Earth-fixed coordinate frame that is widely used in satellite navigation. Difference between WGS-84 and ITRF2014 is roughly a centimeter.

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