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Precise Orbit Determination

The Envisat Precise Orbit Determination (POD) is performed by the Navigation Support Office (TOS-GN) at the European Space Operations Centre (ESOC). The Navigation office generates two different precise orbits for Envisat. The first is a fast delivery orbit (FD) and is based on SLR and Altimeter data and has a delay of 1 day. This orbit is used for the comparison with the operational orbit, the CNES MOE orbit and the near real time monitoring of the Altimeter bias. The second precise orbit (POD) is based on SLR and Doris and has a delay of 6-9 weeks. This orbit is used in the comparison with the CNES precise orbit (POE) and to generate the Doris and SLR statistics available on this page.

Laser Processing

Doris Processing

Altimetry Processing

ESOC Precise (POD) vs. CNES Precise Orbit Comparison (POE)

ESOC Fast Delivery (FD) vs. CNES Intermediate Orbit (MOE)

ESOC Fast Delivery (FD) vs. ESOC Precise (POD)

Radial Orbit Accuracy Assesment

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