IEEE Geoscience and Remote Sensing Magazine - June 2014 - 9

TanDEM-X flying in close formation operating as the first
bistatic SAR interferometer in space [3].
Beyond the generation of the global TanDEM-X DEM,
local DEMs of even higher accuracy levels and applications
based on along-track interferometry (ATI) like measurements of ocean currents are important secondary mission
objectives. Along-track interferometry will also allow for
innovative applications to be explored and can be performed by the so-called dual-receive antenna mode on each
of the two satellites and/or by adjusting the along-track distance to the desired value. Combining both modes will provide a highly capable along-track interferometer with four
phase centers. The different ATI modes will, e.g., be used for
improved detection, localization and ambiguity resolution
in ground moving target indication and traffic monitoring
applications. Furthermore, TanDEM-X supports the demonstration and application of new SAR techniques, with focus
on multistatic SAR, polarimetric SAR interferometry, digital
beam forming and superresolution.
TanDEM-X has a tight time schedule to reach the
main mission goal. The first four years are dedicated to

table 1. SPeCifiCation of tHe Global tanDem-X Dem.
Parameter

Definition

requirement

Relative vertical
accuracy

90% linear point-topoint error in 1° # 1° cell

2 m (slope < 20%)
4 m (slope > 20%)

Absolute vertical
accuracy

90% linear error

10 m

Spatial resolution

Independent pixels

12 m (0.4 arc sec)

the global DEM acquisitions using baseline geometries
optimized for DEM performance. A limited number of
scientific acquisitions have already been included during periods with suitable baselines. After completing the
acquisitions for the global DEM even larger baselines can
be adjusted in a dedicated science phase. This enables
higher accuracy DEMs on local scales and the demonstration of new scientific applications.
The following section provides an overview of the mission concept and key TanDEM-X features, like the Helix
formation, the system synchronization and the global

image courtesy of dlr

june 2014

ieee Geoscience and remote sensing magazine

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