Browsing Articles by Author "Olsen, Karl Erik"

Now showing items 1-15 of 15

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • Sparse Phase Estimation and Processing of Independent Coherent Processing Intervals 

      Akhtar, Jabran; Torvik, Børge; Olsen, Karl Erik (2017)
      Radars employing electronically steering arrays are capable of instantaneously altering the direction of the beam along with other parameters. This flexibility offers great opportunities to a radar as it may e.g. divide ...

    • USRP based cognitive radar testbed 

      Christiansen, Jonas Myhre; Smith, Graeme E.; Olsen, Karl Erik (2017)
      Cognitive radar is a relatively new field of research and the existence of low cost experimental testbeds is limited. This work will show the development of a low cost experimental testbed for experimental validation of ...