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Interference to detect surface changes via SAR satellite data Introduction of the "SqueeSAR™" SAR technology

By interfering the SAR data of two periods in the same place at the phase level, changes in the ground surface can be read at the millimeter level.

Via a tie-up with TRE-Altamira, a technology development company specializing in InSAR, based in Milan, Italy, we have developed the latest in Japan’s InSAR technology, known as "SqueeSAR™." And, in addition to the common application of this technology to the fields of energy and civil engineering, we are also promoting use in the insurance industry, real estate industry, and media industry. Using the Sentinel-1 satellite operated by the European Space Agency (ESA), in the 2.5 years up to June 2018 we have actually gathered analysis results for the totality of all of Japan's land surface.

Explanation of the technology

Basic principles of interference SAR (animation)

 

InSAR (InterferometrySAR) technology measures the displacement of an object in millimeters by comparing radar data over two periods. Through this, it is possible to measure changes in the ground surface at the millimeter level via the difference in the phase of the waves obtained by making two observations on one object.

Features of InSAR technology

  • Can be observed over a wide area
  • Observable retroactively
  • Time series information observable
  • Observable without traveling to the source location
  • No need to prepare GPS receivers or survey points at the source location
  • Observable with millimeter-level accuracy