Browsing by Author "Hamran, Svein-Erik"

Now showing items 1-17 of 17

    • 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 ...

    • Bitstream radar waveforms for generic single-chip radar 

      Bjørndal, Øystein; Hamran, Svein-Erik; Lande, Tor Sverre (2017)
      A Digital-to-Time converter (DTC) based on static CMOS multiplexers is presented, achieving a time resolution of 65 ps consuming 0.5 mW. The DTC relies on gate delay for programmability, ensuring robustness, linearity and ...

    • 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 ...

    • In-Body to On-Body Ultrawideband Propagation Model Derived from Measurements in Living Animals 

      Floor, Pål Anders; Chavez-Santiago, Raul; Brovoll, Sverre; Aardal, Øyvind; Bergsland, Jacob; Grymyr, Ole-Johannes; Halvorsen, Per Steinar; Palomar, Rafael; Plettemeier, Dirk; Hamran, Svein-Erik; Ramstad, Tor Audun; Balasingham, Ilangko (2015)
      Ultra wideband (UWB) radio technology for wireless implants has gained significant attention. UWB enables the fabrication of faster and smaller transceivers with ultra low power consumption, which may be integrated into ...

    • 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 ...

    • Modeling FMCW Radar for Subsurface Analysis 

      Eide, Sigurd; Casademont, Titus; Aardal, Øyvind Lund; Hamran, Svein-Erik (2022-04-05)
      Determining subsurface properties through ground penetrating radar sounding can be challenging, especially in planetary exploration, where little is known about the terrain and additional observations are limited. Analysis ...

    • 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 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 ...

    • Radaravbildning av mål i bevegelse (ISAR) - teori, metoder og signalprosessering 

      Korsbakken, Erik; Hamran, Svein-Erik; Sparr, Trygve (2000)

    • 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 ...

    • 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 ...

    • The WISDOM Radar: Unveiling the Subsurface Beneath the ExoMars Rover and Identifying the Best Locations for Drilling 

      Ciarletti, Valérie; Clifford, Stephen; Plettemeier, Dirk; Le Gall, Alice; Herve, Yann; Dorizon, Sophie; Quantin-Nataf, Cathy; Benedix, Wolf-Stefan; Schwenzer, Susanne; Pettinelli, Elena; Heggy, Essam; Herique, Alain; Berthelier, Jean-Jacques; Kofman, Wlodek; Vago, Jorge L.; Hamran, Svein-Erik (2017)
      The search for evidence of past or present life on Mars is the principal objective of the 2020 ESA-Roscosmos ExoMars Rover mission. If such evidence is to be found anywhere, it will most likely be in the subsurface, where ...