Cross-sensor interferometry succeeds

March 17th, 2019, Published in Articles: PositionIT

Airbus Defence and Space and Hisdesat Servicios Estratégicos have generated the first joint TerraSAR-X/PAZ radar interferogram, demonstrating the missions’ capacity for cross-sensor interferometry, whose processing is among the most challenging. Interferograms are typically used to derive the topographic elevation and deformation of the Earth’s surface, and are created using at least two different images acquired at different dates. This flattened Cross-Sensor-Interferogram has been created from a mixed image pair with four days temporal separation acquired by TerraSAR-X and PAZ (StripMap scenes from 22 and 26 November 2018). As PAZ is positioned in the same orbit as TerraSAR-X and TanDEM-X and features exactly identical ground swaths and acquisition modes, they all three form a high-resolution SAR satellite constellation, jointly exploited by Hisdesat and Airbus. With the launch of PAZ, the observation repeat cycle has been divided by half, which improves the monitoring of fast ground deformation phenomena that can endanger lives and infrastructures. This is a step towards achieving the implementation of the TerraSAR-X / PAZ radar constellation.

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