Original Article

GPS Solutions

, Volume 16, Issue 2, pp 231-241

Altimetry with GNSS-R interferometry: first proof of concept experiment

  • Antonio RiusAffiliated withInstitut d’Estudis Espacials de Catalunya-CSIC Email author 
  • , Oleguer Nogués-CorreigAffiliated withInstitut d’Estudis Espacials de Catalunya-CSIC
  • , Serni RibóAffiliated withInstitut d’Estudis Espacials de Catalunya-CSIC
  • , Estel CardellachAffiliated withInstitut d’Estudis Espacials de Catalunya-CSIC
  • , Santi OliverasAffiliated withInstitut d’Estudis Espacials de Catalunya-CSIC
  • , Enric ValenciaAffiliated withInstitut d’Estudis Espacials de Catalunya-UPC
  • , Hyuk ParkAffiliated withInstitut d’Estudis Espacials de Catalunya-UPC
  • , José Miguel TarongíAffiliated withInstitut d’Estudis Espacials de Catalunya-UPC
  • , Adriano CampsAffiliated withInstitut d’Estudis Espacials de Catalunya-UPC
    • , Hans van der MarelAffiliated withInstitute of Earth Observation and Space Systems, Faculty of Aerospace Engineering, Delft University of Technology
    • , Roel van BreeAffiliated withInstitute of Earth Observation and Space Systems, Faculty of Aerospace Engineering, Delft University of Technology
    • , Bas AltenaAffiliated withInstitute of Earth Observation and Space Systems, Faculty of Aerospace Engineering, Delft University of Technology
    • , Manuel Martín-NeiraAffiliated withEuropean Space Research and Technology Centre

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Abstract

The Global Navigation Satellite System Reflectometry (GNSS-R) concept was conceived as a means to densify radar altimeter measurements of the sea surface. Until now, the GNSS-R concept relied on open access to GNSS transmitted codes. Recently, it has been proposed that the ranging capability of the technique for ocean altimetric applications can be improved by using all the signals transmitted in the bandwidth allocated to GNSS, which includes open access as well as encrypted signals. The main objective of this study is to provide experimental proof of this enhancement through a 2-day experiment on the Zeeland Bridge (The Netherlands). In the experiment, we used a custom built GNSS-R system, composed of high gain GPS antennas, calibration subsystem, and an FPGA-based signal processor which implemented the new concepts, an X-band radar altimeter and a local geodetic network. The results obtained indicate that the new approach produces a significant improvement in GNSS-R altimetric performance.

Keywords

Ocean altimetry GNSS reflectometry Bistatic radars