Terminology

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

ASN.1 - Abstract Syntax Notation One. A formal notation used for describing data transmitted by telecommunications protocols such as LPP.

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

BeiDou - Global navigation satellite system operated by China.

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

GLONASS - Global Navigation Satellite System operated by Russia.

GNSS - Global Navigation Satellite System. An umbrella term for all satellite navigation systems such as GPS, GLONASS, Galileo, BeiDou, and QZSS.

GPS - Global Positioning System owned by the United States.

HTTP - Hypertext Transfer Protocol. The protocol used for communication with the HERE GNSS Data API.

LPP - LTE Positioning Protocol. A 3GPP defined protocol for positioning.

Multipart response - An HTTP response with content type multipart/mixed containing multiple body parts, each with its own headers and content. The HERE GNSS Data API uses multipart responses to return separate LPP messages for each requested GNSS system.

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

OAuth - Open Authorization framework. An industry-standard protocol for authorization.

PE - Position Engine. Client software running the position algorithms.

QZSS - Quasi-Zenith Satellite System. A regional navigation satellite system commissioned by Japan.

REST API - Representational State Transfer Application Programming Interface. A web service interface that uses standard HTTP methods.

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

UPER - Unaligned Packed Encoding Rules. An efficient and compact format for encoding ASN.1 data structures.