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.

JER - JSON Encoding Rules. An ASN.1 encoding format that represents
data structures as JSON objects.

JSON text sequences - A format for serializing multiple JSON values
in a stream, as defined by RFC 7464. Content type: application/json-seq.

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.

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

NDJSON - Newline-delimited JSON. A format for streaming JSON data where each
JSON object is separated by a newline character. Content type: application/x-ndjson.

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

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

Predicted navigation model - Navigation model data that is computed in advance
to cover a future time period. Allows GNSS receivers to achieve fast TTFF
without a network connection by using pre-downloaded data.

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.

Validity period - The time interval during which a predicted navigation model
is valid. Each prediction LPP message covers a specific validity period defined
by a start time and duration.