DORIS: Satellite Doppler Data for Precise Orbit Determination

DORIS (Doppler Orbitography and Radiopositioning Integrated by Satellite) is a dual-frequency uplink system developed by the French space agency CNES for precise satellite orbit determination and ground beacon positioning. The system operates with receivers on satellites and transmitters on the ground, creating a centralized data collection and distribution network. Data has been collected from missions including TOPEX/Poseidon, SPOT-2 through SPOT-5, Envisat, and the Jason satellite series.

Use Cases

• Calculating precise satellite orbits based on dual-frequency Doppler shift measurements.
• Determining high-accuracy locations for ground-based beacon stations for point positioning.
• Contributing to the maintenance of the International Terrestrial Reference Frame (ITRF) using long-term data from multiple satellite missions.
• Analyzing time-series data for geophysical studies like tectonic plate motion or sea level change.

Strengths

• Data originates from a system developed by a major national space agency (CNES) with international cooperation.
• Provides long-term observational records from multiple, well-documented satellite missions spanning decades.
• Uses a centralized, quality-controlled processing system where observations are edited before distribution.

Limitations

• Critical metadata is missing: column names, row counts, and dataset size are unknown across all sources.
• The license is ambiguously listed as 'other-license-specified' on some platforms and 'None' on others, creating uncertainty for reuse.
• The 'last updated' metadata field shows a future date (2026-04-10), indicating potential data integrity or timestamping issues.

Provenance

Source

Centre National d'Etudes Spatiales (CNES)

Collection Method

Measurements of Doppler shift on radiofrequency signals emitted by ground beacons and received by satellite receivers.

Freshness

2026-04-10 03:51:17.656753

Geography

Global, via a network of ground beacons and satellite overpasses.