Terminology

API keys - Simple and secure credentials for using your application with HERE APIs.

ASN.1 - Formal notation used for describing data transmitted by telecommunications protocols like LPP.

Assistance data - Navigation models and other data (for example, ionospheric model) that aids the calculation of GNSS position in device.

Beidou - Global navigation satellite system operated by China.

BER - Basic Encoding Rules, a self-describing and self-delimiting format for encoding ASN.1 data structures.

Correction data - Data that helps position GNSS receivers more accurately.

GALILEO - Global navigation satellite system created by the European Union.

GLONASS - Global navigation satellite system operated by Russia.

GNSS - Global Navigational Satellite System. An umbrella for all satellite systems like GPS, GLONASS, GALILEO, Beidou, and QZSS.

GPS - Global Positioning System owned by the United States.

HD GNSS - High Definition GNSS, a HERE product providing correction data services.

LPP - 3GPP defined LTE Positioning Protocol.

Navigation model - Ephemeris (orbit) data and clock model for a satellite.

OAuth - Open Authorization framework. Industry-standard protocol for authorization.

PE - Position Engine, client software running the position algorithms.

PPP - Precise Point Positioning, a positioning technique behind HD-GNSS product utilizing SSR correction data.

Protobuf - Google's language-neutral, platform-neutral, extensible mechanism for serializing structured data.

QZSS - Quasi-Zenith Satellite System. Regional navigation satellite system comissioned by Japan.

SSR - State Space Representation. Correction data that models major errors over large areas.

TTFF - Time to first fix. The time required for a GPS navigation device to acquire satellite signals and navigation data and calculate a position.

WebSocket - Computer communications protocol providing full-duplex communication channels over a single TCP connection.

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