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Sökning: WFRF:(Stenström Gunnar 1951)

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1.
  • Ulander, Lars, 1962, et al. (författare)
  • Airborne passive SAR imaging based on DVB-T signals
  • 2017
  • Ingår i: IEEE International Geoscience and Remote Sensing Symposium (IGARSS). - 2153-7003. ; , s. 2408-2411
  • Konferensbidrag (refereegranskat)abstract
    • Passive SAR data have been registered using the airborne low frequency SAR system LORA. For this purpose, the radar sensor was reconfigured to not transmit any signals but only gather data along the pre-defined synthetic aperture. The receiver unit was tuned to fully accommodate the DVB-T signal centred at 634 MHz (channel #41), acting as the illuminator of opportunity within the ground scene mapped. SAR images have successfully been formed for areas located in the vicinity of the DVB-T transmitter mast but also at distances 40 km away. In the data set processed, the direct and the ground-reflected signals have been registered with the same antenna element.
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2.
  • Ulander, Lars, 1962, et al. (författare)
  • Airborne SAR for Calibration of P-Band Tower Radar
  • 2019
  • Ingår i: International Geoscience and Remote Sensing Symposium (IGARSS). ; , s. 541-544
  • Konferensbidrag (refereegranskat)abstract
    • BorealScat is a tower-based radar which measures multipolarization and tomographic backscatter time series data at a forest site in Southern Sweden. In this paper, we describe a methodology for absolute radiometric calibration of BorealScat and apply it to a set of backscatter measurements at P-band (420–450 MHz). We present radiometric calibration corrections which take into account antenna gain and range variations over the tomographic resolution cell. We also use data acquired by the LORA airborne UHF-band SAR over the BorealScat site to determine the absolute radiometric calibration factor for P-band and HH- polarization. It is shown that the methodology produces consistent results for multiple SAR images.
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