Now showing items 1-20 of 23

    • Analysis of detection performance of incoherent range walk compensation for passive radar 

      Finden, Erlend; Christiansen, Jonas Myhre; Lie-Svendsen, Øystein; Olsen, Karl Erik (2015)
      This paper analyzes the performance of an incoherent range walk compensation method for passive radar systems. The method utilizes the velocity information in the range-Doppler map, and no detection before compensation ...
    • Bistatiske radarmålinger av helikopter 

      Tansem, Ivar; Johnsen, Terje; Gundersen, Rune; Olsen, Karl Erik; Johnsrud, Steinar; Sørnes, Per K. (2002)
      A civilian helicopter was used for measurements with our bistatic CW radar. The flashes of the helicopter rotor blades as well as the helicopter body were detected. Detection of the helicopter body depended on the level ...
    • Classification of birds and UAVs based on radar polarimetry 

      Torvik, Børge; Olsen, Karl Erik; Griffiths, Hugh (2016)
      This letter aims to show the potential of using polarimetric parameters to distinguish between large birds and unmanned aerial vehicles (UAVs) of comparable size in the context of a modern long-range air defense radar. ...
    • Coherent range and Doppler-walk compensation in PBR applications 

      Christiansen, Jonas Myhre; Olsen, Karl Erik; Weiss, Georg (2014)
      The focus of PBR research has shifted from FM to also include DVB-T and DAB over the last years, and are facing the challenges of higher bandwidth, i.e. improved range resolution. While the FM based PBR systems primarily ...
    • A Compressed Sensing Based Design for Formation of Range-Doppler Maps 

      Akhtar, Jabran; Olsen, Karl Erik (2016)
      Compressed sensing (CS) based reconstruction methods have been in much focus over the last years as they provide a mean to work with limited amount of data. In this article we present an application of CS and sparse ...
    • Compressed Sensing with Interleaving Slow-Time Pulses and Hybrid Sparse Image Reconstruction 

      Akhtar, Jabran; Torvik, Børge; Olsen, Karl Erik (2017)
      This paper explores a type of hybrid sparse reconstruction technique for modern multifunction task scheduling radars and on following range-Doppler plots. A compressed sensing (CS) framework is devised to emit and then ...
    • Detection performance for Incoherent Range Walk Compensation 

      Finden, Erlend; Christiansen, Jonas Myhre; Lie-Svendsen, Øystein; Olsen, Karl Erik (2014-11-24)
      FFI supports the Royal Norwegian Air Force in their acquisition of new air surveillance sensors. Improved detection performance on low observable targets may be obtained by increasing the radar dwell time on target. For ...
    • Digital multistatisk radar - overordnet maskinvarebeskrivelse 

      Tansem, Ivar; Gundersen, Rune; Bjordal, Halvor; Johnsen, Terje; Johnsrud, Steinar; Olsen, Karl Erik; Sørnes, Per K. (2002)
      This report gives a high level description of a radar demonstrator made for demonstrating bistatic radar. The demonstrator consists of one transmitter and one receiver unit. An overview of the hardware used in the ...
    • Digitalt kalibrerte radarmålinger med usynkronisert sender og mottaker 

      Olsen, Karl Erik; Johnsrud, Steinar (2001)
      The report describes a signal processing algorithm used on radar data collected from a unsynchronized radar system. The algorithm makes corrections for the missing synchronization between transmitter and receiver, and has ...
    • DSI Suppression with Adaptive Beamforming in DVB-T Passive Radar Measurements 

      Strøm, Kyrre; Lie-Svendsen, Øystein; Norheim-Næss, Idar; Johnsen, Terje; Finden, Erlend; Olsen, Karl Erik (2018)
      Adaptive beamforming (ABF) for maximizing the signal to interference plus noise ratio (SINR) is applied to acquisitions made by a passive bistatic radar (PBR) exposed to strong direct signal interference (DSI). The DVB-T ...
    • Formation of Range-Doppler Maps Based on Sparse Reconstruction 

      Akhtar, Jabran; Olsen, Karl Erik (2016)
      This paper presents an application of compressed sensing in a pulsed system, such as a radar or sonar to form range-Doppler maps. Instead of transmitting a train of pulses, we portrait a system where the pulse emission ...
    • Frequency agility radar with overlapping pulses and sparse reconstruction 

      Akhtar, Jabran; Olsen, Karl Erik (2018)
      The use of frequency agility has a proven track record in radar systems. Altering the radar carrier frequency over shorter intervals improves the detection capabilities for slowly fluctuating targets and increases jamming ...
    • Fully adaptive radar for track update-interval control 

      Christiansen, Jonas Myhre; Olsen, Karl Erik; Smith, Graeme E. (2018)
      A fully adaptive radar framework has been proposed in recent publications, and this paper will implement the framework in an adaptive update rate application for a tracking radar. A cost function is developed to balance ...
    • GO-CFAR Trained Neural Network Target Detectors 

      Akhtar, Jabran; Olsen, Karl Erik (2019)
      Detecting targets embedded in noise and clutter is an essential task for many radar systems. A competent system must additionally offer high probability of detection with a low false alarm rate and a standard practice is ...
    • Multiband Passive Bistatic Radar Coherent Range and Doppler-Walk Compensation 

      Olsen, Karl Erik; Christiansen, Jonas Myhre (2015)
      The work simulates the performance of a coherent Passive Bistatic Radar multiband processing algorithm. The aim of the work is to present improved range resolution by coherently combine non-adjacent DVB-T channels, while ...
    • Multistatisk CW radar - konsept 

      Johnsen, Terje; Olsen, Karl Erik; Johnsrud, Steinar; Gundersen, Rune; Tansem, Ivar; Sørnes, Per K.; Bjordal, Halvor (2002)
      A technical concept study of digital multistatic radar has been executed in project 726. The concept is based on the use of a number of low cost lightweight transmitters and an advanced high-priced passive receiver unit. ...
    • Performance of a Multiband Passive Bistatic Radar Processing Scheme - Part II 

      Olsen, Karl Erik; Woodbridge, Karl (2012)
      Simulations based on real-life FM radio waveforms showed that the algorithm is capable of improving range resolution, and thus the accuracy, according to theory for single scatterers as is summarized. The performance of ...
    • Radardekningssimulator - fysikk 

      Olsen, Karl Erik (2002)
      Project 726 has developed a multistatic radar coverage prediction tool for frequencies above 100MHz. Various physical effects such as reflection, diffraction, refraction, attenuation due to precipitation and atmospheric ...
    • Range and Doppler walk in DVB-T based Passive Bistatic Radar 

      Christiansen, Jonas Myhre; Olsen, Karl Erik (2010)
      This paper analyzes the effects of range and Doppler walk for a Digital Video Broadcast - Terrestrial based Passive Bistatic Radar of both simulated and experimental data. Range and Doppler walk cause energy dispersal ...
    • Single European Sky - et sivilt program med militære konsekvenser 

      Olsen, Karl Erik (2015-06-25)
      Norge er omfattet av EUs lovgivning som i 2004 etablerte initiativet Single European Sky (SES) ”Det felles europeiske luftrom”. Bakgrunnen for EU-initiativet er utfordringer knyttet til økt trafikk i europeisk luftrom. ...