DORIS Satellite Doppler Data for Precise Orbit Determination

DORIS data provides precise orbit determination and high-accuracy ground beacon positioning using a dual-frequency Doppler system. The system was developed by the French space agency CNES and has been deployed on multiple satellite missions including TOPEX/Poseidon, SPOT series, Envisat, and Jason. This centralized uplink system collects Doppler shift measurements from ground beacons to orbiting receivers.

Use Cases

• Precise orbit determination for satellites carrying DORIS receivers.
• High-accuracy point positioning of ground-based beacon stations.
• Analysis of dual-frequency Doppler shift measurements for atmospheric and ionospheric studies.
• Validation and calibration of other satellite navigation and positioning systems.
• Long-term geodetic reference frame maintenance using data from multiple satellite missions.

Strengths

• Developed and maintained by the French national space agency (CNES), indicating institutional support.
• Deployed on a long series of major satellite missions (TOPEX/Poseidon, SPOT-2 to -5, Envisat, Jason), providing continuity.
• Uses a centralized uplink system with ground-based transmitters, allowing for controlled data collection and distribution.

Limitations

• Critical metadata such as row count, file size, and specific column names are unavailable across all platforms.
• The license is ambiguously listed as 'other-license-specified' on Data.gov, with no details provided on NASA Earthdata.
• The 'last updated' date of 2026-03 13 on Data.gov appears to be a future timestamp, indicating a potential metadata error.

Provenance

Source

Centre National d'Etudes Spatiales (CNES) with cooperation from other French government agencies.

Collection Method

Accurate measurement of the Doppler shift on radiofrequency signals emitted by ground beacons and received on spacecraft.

Time Range

Covers the operational periods of missions including TOPEX/Poseidon, SPOT-2, -3, -4, -5, Envisat, and Jason satellites.

Freshness

2026-03-13 22:34:33.123392

Geography

Global, via a network of ground beacons and multiple orbiting satellites.