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Definition
Functional Requirements
Syntax
Semantics
Conformance Testing
Performance Assessment

1      Definition

GNSS Object is a Data Type comprising:

  1. GNSS Data from a Global Navigation Satellite System (GNSS) obtained from an integration of a constellation of satellites that transmit position and timing data to GNSS receivers and enable them to determine the receivers’ location.
  2. GNSS Data Qualifier specified by MPAI-TFA providing information on Sub-Types, Formats, and Attributes.

2      Functional Requirements

GNSS Data can come from four GNSSs – GPS (US), GLONASS (RU), Galileo (EU), BeiDou (CN) – and two regional systems – QZSS (Japan) and IRNSS or NavIC (India). Accuracy of the Position obtained from GNSS Data depends on the GNSS system used.

3      Syntax

https://schemas.mpai.community/CAV2/V1.1/data/GNSSObject.json

4      Semantics

Table 1 – Semantics of the GNSS Object Data Type

Label
Description
Header GNSS Object Header – Standard “CAV‑GNO‑Vx.y”.
MInstanceID Identifier of the M-Instance (Virtual Space) associated with this GNSS Object.
UEnvironmentID Identifier of the U-Environment (Real Space) associated with this GNSS Object.
GNSSObjectID Unique identifier of this GNSS Object instance.
GNSSObjectTime Time this GNSS Object was produced.
GNSSObjectSpaceTime Space/Time where/when this GNSS Object applies.
GNSSData[] GNSS Data from a Global Navigation Satellite System receiver. Each item provides the data as inline content, a URI reference, or an external ID.
GNSSDataQualifier Qualifier providing information on Sub-Types, Formats, and Attributes of GNSS Data.
DataXMData MPAI-PTF Data Exchange Metadata providing provenance, authorisation, legal, security, and confidence information associated with this GNSS Object in a trusted data exchange context.
DescrMetadata Human-readable descriptive metadata of the GNSS Object (plain text, max 2048 characters).

5      Conformance Testing

A Data instance conforms with GNSS Object (CAV‑GNO) if:

  1. The Data validates against the GNSS Object’s JSON Schema.
  2. All Data in the GNSS Object’s JSON Schema:
    1. Have the specified type.
    2. Validate against their JSON Schemas.
    3. Conform with their Data Qualifiers.

6      Performance Assessment

Not part of this specification.

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