Interferometric Performance of a Cartwheel Constellation for TerraSAR-L
G Krieger(1) and T Amiot(2)
Microwaves and Radar Institute,
(2) CNES, ., Toulouse, France
The option of adding a cartwheel constellation to the TerraSAR-L
mission is being investigated. Different micro satellite constellations
flying in close formation with TerraSAR-L are under consideration.
Primary objective is the generation of a global DEM of HRTI level-3
quality. Ocean current monitoring is another important application
facilitated by such a single-pass INSAR configuration.
The constellation will be an integral element of TerraSAR-L, i.e.
special cartwheel modes exploiting the full capabilities of the main
spacecraft will be used to improve the performance. Furthermore inter
satellite links can be used to synchronise the data recording and
provide TT&C communication and science data downlink via TerraSAR-L and
hence simplify the micro satellite architecture.
This paper provides a comprehensive prediction of the achievable
interferometric performance for a TerraSAR-L cartwheel constellation.
Assuming receiving antennas of only 3m diameter ambiguity and noise
floor levels are analysed in detail. Expected DEM accuracies for
different effective baselines at different swath positions including
effects of local slope and volume decorrelation over vegetation are
Keywords: ESA European
Space Agency - Agence spatiale europeenne,
observation de la terre, earth observation,
satellite remote sensing,
teledetection, geophysique, altimetrie, radar,
chimique atmospherique, geophysics, altimetry, radar,