Browsing by Author "Berger, Tor"

Now showing items 1-16 of 16

    • Assessing Radar Attenuation in RIMFAX Soundings at the Jezero Western Fan Front, Mars 

      Eide, Sigurd; Casademont, Titus; Shoemaker, Emileigh S.; Brovoll, Sverre; Berger, Tor; Dypvik, Henning; Hamran, Svein-Erik (2024-07-02)
      Estimates of radar attenuation in the shallow Martian subsurface are retrieved from RIMFAX soundings along the Perseverance rover traverse. Specifically, analyzed data is from the Hawksbill Gap area during the rover's first ...

    • Compact airborne C-band radar sounder 

      Øyan, Mats Jørgen; Hamran, Svein-Erik; Damsgård, Leif; Berger, Tor (2014)
      We describe a lightweight wideband C-band radar sounder, which is designed for use in a small unmanned aerial vehicle, primarily for measuring snow and ice. The waveform used is a gated frequency modulated continuous wave, ...

    • Comparison of two methods for automatic range alignment in ISAR imaging 

      Berger, Tor; Tollisen, Steffen; Hamran, Svein-Erik (2011)
      A maximum likelihood algorithm for translational motion estimation (TME) in ISAR imaging is described and compared with prominent point processing (PPP). It is suggested that the kurtosis (fourth order central moment) of ...

    • Experimental investigation into radar-based central blood pressure estimation 

      Solberg, Lars Erik; Aardal, Øyvind; Berger, Tor; Balasingham, Ilangko; Fosse, Erik; Hamran, Svein-Erik (2015)
      To assess whether radar technology can be used for monitoring blood pressure via information from the aorta, two experiments were performed: (i) measurements on a phantom model and (ii) acquisitions on a human subject for ...

    • Harmonic Synthetic Aperture Radar Processing 

      Berger, Tor; Hamran, Svein-Erik (2015)
      We review the basic concept of frequency-modulated continuous wave (FMCW) and describe how such a radar system can be used in a harmonic radar concept. It is argued that synthetic aperture radar (SAR) for FMCW harmonic ...

    • Konseptløsninger for undervannsovervåking 

      Berger, Tor; Synnes, Stig Asle; Tveit, Bjørn (2001)
      FFI–project 791 part 2, underwater surveillance, is concluded in this report by the proposal of generic concepts for underwater surveillance systems. Guidelines for how to choose among the proposals are also included. The ...

    • Minimum Variance Signal Selection for Aorta Radius Estimation Using Radar 

      Solberg, Lars Erik; Hamran, Svein-Erik; Berger, Tor; Balasingham, Ilangko (2010)
      This paper studies the optimum signal choice for the estimation of the aortic blood pressure via aorta radius, using a monostatic radar configuration. The method involves developing the Cramér-Rao lower bound (CRLB) for a ...

    • Overvåkings- og sikringssystemer for MFU03 

      Gran, Hans Christian; Berger, Tor; Dyrdal Idar; Busmundrud, Odd; Pedersen, Bjørn (2002)
      The report presents the current status and expected future developments of some surveillance and safety systems covering NBC surveillance, camera surveillance and field reconnaissance. A short description of sensor technology ...

    • Physical Working Principles of Medical Radar 

      Aardal, Øyvind; Paichard, Yoann; Brovoll, Sverre; Berger, Tor; Lande, Tor Sverre; Hamran, Svein-Erik (2013)
      There has been research interest in using radar for contactless measurements of the human heartbeat for several years. While many systems have been demonstrated, not much attention have been given to the actual physical ...

    • Radar Attenuation in the Shallow Martian Subsurface: RIMFAX Time-Frequency Analysis and Constant-Q Characterization Over Jezero Crater Floor 

      Eide, Sigurd; Casademont, Titus; Berger, Tor; Dypvik, Henning; Hamran, Svein-Erik; Shoemaker, Emileigh S. (2023-04-16)
      Attenuation of radar waves in the subsurface can be quantified with a constant-Q approximation through time-frequency analysis. We implement the centroid frequency-shift method and study Radar Imager for Mars' Subsurface ...

    • Radar imager for Mars’ subsurface experiment—RIMFAX 

      Hamran, Svein-Erik; Paige, David A.; Amundsen, Hans E. Foss; Berger, Tor; Brovoll, Sverre; Carter, Lynn; Hanssen, Leif; Dypvik, Henning; Eide, Jo; Eide, Sigurd; Ghent, Rebecca; Helleren, Øystein; Kohler, Jack; Mellon, Mike; Nunes, Daniel C.; Plettemeier, Dirk; Rowe, Kathryn; Russell, Patrick; Øyan, Mats Jørgen (2020-11-03)
      The Radar Imager for Mars’ Subsurface Experiment (RIMFAX) is a Ground Penetrating Radar on the Mars 2020 mission’s Perseverance rover, which is planned to land near a deltaic landform in Jezero crater. RIMFAX will add a ...

    • Radar sensitivity to human heartbeats and respiration 

      Aardal, Øyvind; Brovoll, Sverre; Paichard, Yoann; Berger, Tor; Lande, Tor Sverre; Hamran, Svein-Erik (2015)
      Human heartbeats and respiration can be detected from a distance using radar. This can be used for medical applications and human being detection. It is useful to have a system independent measure of how detectable the ...

    • RIMFAX Ground Penetrating Radar Reveals Dielectric Permittivity and Rock Density of Shallow Martian Subsurface 

      Casademont, Titus; Eide, Sigurd; Shoemaker, E.S.; Liu, Y.; Nunes, D.C.; Russell, P.; Dypvik, Henning; Amundsen, Hans E. Foss; Berger, Tor; Hamran, Svein-Erik (2023-06-02)
      The Mars 2020 Perseverance Rover is equipped with the RIMFAX ground penetrating radar instrument which has been continuously surveying the shallow subsurface during the rover's journey. Within the first 379 mission ...

    • Tek 14: Operasjon "Iraqi Freedom" : militærteknologiske betraktninger om kampene i Irak våren 2003 

      Eggereide, Bård; Berger, Tor; Johansen, Iver; Wahl, Terje; Aabakken, Ola (2003)
      This report discusses selected military technology issues that were important during Operation Iraqi Freedom in Iraq 2003. The main elements pointing toward the future, were the use of UAVs, cruise missiles, precision ...

    • Time-lapse imaging of human heart motion with switched array UWB radar 

      Brovoll, Sverre; Berger, Tor; Paichard, Yoann; Aardal, Øyvind; Lande, Tor Sverre; Hamran, Svein-Erik (2014)
      Radar systems for detection of human heartbeats have mostly been single-channel systems with limited spatial resolution. In this paper, a radar system for ultra-wideband (UWB) imaging of the human heart is presented. To ...

    • Ultrawideband Gated Step Frequency Ground-Penetrating Radar 

      Øyan, Mats Jørgen; Hamran, Svein-Erik; Hanssen, Leif; Berger, Tor; Plettemeier, Dirk (2012)
      We describe a prototype ultrawideband radar. We show how the system was designed and how the hardware was developed for the radar prototype. Waveform generation, radar parameters, and signal processing for the stepped ...