Publications of Lars M.H. Ulander

Articles in journal or book chapters

1. Albert R. Monteith, Lars M. H. Ulander, and Stefano Tebaldini. Calibration of a Ground-Based Array Radar for Tomographic Imaging of Natural Media. Remote Sensing, 11(24), 2019. Keyword(s): SAR Tomography, BorealScat. [Abstract] [bibtex-entry]



2. Jan Torgrimsson, Patrick Dammert, Hans Hellsten, and Lars M. H. Ulander. SAR Processing Without a Motion Measurement System. IEEE Transactions on Geoscience and Remote Sensing, 57(2):1025-1039, February 2019. Keyword(s): SAR Processsing, Backprojection, Fast-factorized Back-projection, FFBP, Time-Domain Back-Projection, TDBP, Azimuth Focusing, Motion Compensation, MoComp, autofocus, geometric autofocus, radar imaging, synthetic aperture radar, synthetic aperture radar image, very high frequency band, base-2 fast factorized back-projection, track velocity error, CARABAS II system, ultrawideband data sets, innovative autofocus concept, subaperture pair, free geometry parameters, back-projection formulation, factorized geometrical autofocus, SAR processing, FGA algorithm, VHF-band, wavelength-resolution SAR image, FGA images, linear equidistant track, basic geometry model, Geometry, Synthetic aperture radar, Global Positioning System, Tracking, Apertures, Radar tracking, Autofocus, back-projection (BP), factorized geometrical autofocus (FGA), Synthetic Aperture Radar (SAR). [Abstract] [bibtex-entry]



3. Albert R. Monteith and Lars M. H. Ulander. Temporal Survey of P- and L-Band Polarimetric Backscatter in Boreal Forests. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 11(10):3564-3577, October 2018. Keyword(s): SAR Tomography, backscatter, radar imaging, radar polarimetry, remote sensing by radar, spaceborne radar, synthetic aperture radar, vegetation mapping, temporal survey, L-band polarimetric backscatter, boreal forests, environmental conditions, seasonal variations, backscattered radar signal, biomass retrieval scheme, synthetic aperture radar data, electromagnetic scattering mechanisms, biomass estimation algorithms, L-band SAR missions, temporal changes, HV-polarized P, L-band radar backscatter, boreal forest site, environmental parameters, mature Norway spruce, above-ground biomass, approximately 250 tons/ha, BorealScat tower-based scatterometer, L-band backscatter, HH/VV backscatter ratio, average backscatter, double-bounce scattering, severe temporal decorrelation, P-band temporal coherence, mass 250.0 ton, time 5.0 min, noise figure 4.0 dB to 10.0 dB, Synthetic aperture radar, L-band, Backscatter, Biomass, Antenna arrays, Coherence, Backscatter, boreal forest, L-band, P-band, synthetic aperture radar (SAR), temporal coherence, time series. [Abstract] [bibtex-entry]



4. Lars M. H. Ulander, Albert R. Monteith, Macej J. Soja, and Leif E. B. Eriksson. Multiport Vector Network Analyzer Radar for Tomographic Forest Scattering Measurements. IEEE Geoscience and Remote Sensing Letters, 15(12):1897-1901, December 2018. Keyword(s): SAR Tomography, BorealScat, antenna arrays, multiport networks, network analysers, radar antennas, radar imaging, S-parameters, tomographic forest scattering measurements, C-band radar, BorealScat, radar tomography, vertical antenna array, vertical scattering distribution, temporal decorrelation, reflected signals, 20-port vector network analyzer, stepped-frequency waveform, 20-element arrays, radar measurements, hemiboreal forest, tomographic imaging capabilities, multiport VNA tomography results, 2-port VNA measurement scheme, multiport vector network analyzer radar, P-band radar, L-band radar, polarimetric time-series measurements, Antenna measurements, Antenna arrays, Forestry, Tomography, Radar, Radar antennas, Switches, BorealScat, forest, polarimetry, radar, scattering, time series, tomography, vector network analyzer (VNA). [Abstract] [bibtex-entry]



5. Jan Torgrimsson, Patrik Dammert, Hans Hellsten, and Lars M. H. Ulander. An Efficient Solution to the Factorized Geometrical Autofocus Problem. IEEE Transactions on Geoscience and Remote Sensing, 54(8):4732-4748, August 2016. Keyword(s): SAR Processing, Autofocus, Fast-Factorized Back-Projection, FFBP, radar imaging, synthetic aperture radar, 6-D autofocus problem, FGA algorithm, adjustable geometry parameters, factorized back-projection formulation, factorized geometrical autofocus problem, geometrical variation, global autofocus solution, magnitude values, maximizing focus quality, peak-to-sidelobe ratio, point-like targets, synthetic-aperture-radar processing, ultrawideband CARABAS II data, Apertures, Geometry, Radar imaging, Radar tracking, Search problems, Synthetic aperture radar, Autofocus, back-projection, synthetic aperture radar (SAR). [Abstract] [bibtex-entry]



6. Maciej J. Soja, H.J. Persson, and Lars M.H. Ulander. Estimation of Forest Biomass From Two-Level Model Inversion of Single-Pass InSAR Data. IEEE Trans. Geosci. Remote Sens., 53(9):5083-5099, September 2015. Keyword(s): data acquisition, digital elevation models, forestry, radar interferometry, remote sensing by radar, synthetic aperture radar, vegetation, AD 2008, AD 2010, AD 2011, AD 2012, AD 2013, InSAR processing, Krycklan feature, Remningstorp feature, Swedish test site, VV-polarized TanDEM-X acquisition, aboveground biomass estimation, biomass predictor, canopy density, digital terrain model, forest biomass estimation, forest height, hemiboreal forest, northern Sweden, single-pass InSAR data, single-pass interferometric synthetic aperture radar data, southern Sweden, two-level model inversion, Biological system modeling, Biomass, Computational modeling, Correlation, Decorrelation, Estimation, Synthetic aperture radar, Aboveground biomass (AGB), TanDEM-X (TDM), canopy density, forest height, interferometric model, interferometric syntheticaperture radar (InSAR), two-level model (TLM). [Abstract] [bibtex-entry]



7. Maciej J. Soja, H. Persson, and Lars M. H. Ulander. Estimation of Forest Height and Canopy Density From a Single InSAR Correlation Coefficient. IEEE Geosci. Remote Sens. Lett., 12(3):646-650, March 2015. Keyword(s): digital elevation models, geophysical image processing, parameter estimation, radar interferometry, remote sensing by radar, synthetic aperture radar, vegetation mapping, AD 2011 to 2013, VV-polarized bistatic-interferometric TanDEM-X image pairs, canopy density, forest height estimation, hemiboreal test site Remningstorp, high-resolution digital terrain model, single InSAR correlation coefficient, southern Sweden, synthetic aperture radar, two-level model, vegetation, Backscatter, Coherence, Laser radar, Remote sensing, Synthetic aperture radar, Time division multiplexing, Vegetation, Canopy density, TanDEM-X, forest height, interferometric model, interferometry, synthetic aperture radar (SAR), two-level model (TLM). [Abstract] [bibtex-entry]



8. Jan Torgrimsson, Patrik Dammert, Hans Hellsten, and Lars M. H. Ulander. Factorized Geometrical Autofocus for Synthetic Aperture Radar Processing. IEEE Trans. Geosci. Remote Sens., 52(10):6674-6687, October 2014. Keyword(s): SAR Processing, Fast-Factorized Back-Projection, FFBP, Time-Domain Back-Projection, TDBP, Airborne SAR, CARABAS Autofocus, SAR Autofocus, Geometrical Autofocus, radar imaging, radar tracking, synthetic aperture radar, ultra wideband radar, FGA algorithm, coherent all radio band system II data set, constrained problem, factorized geometrical autofocus algorithm, fast factorized back-projection chain, gain 3 dB, intensity correlation, object function, peak-to-sidelobe ratio measurement, radar imaging, residual space variant range cell migration, ultrawideband synthetic aperture radar processing, Apertures, Electronics packaging, Geometry, Radar tracking, Synthetic aperture radar, Transforms, Autofocus, back-projection, phase gradient algorithm (PGA), synthetic aperture radar (SAR). [Abstract] [bibtex-entry]



9. P. Frolind, A. Gustavsson, M. Lundberg, and L. M. H. Ulander. Circular-Aperture VHF-Band Synthetic Aperture Radar for Detection of Vehicles in Forest Concealment. IEEE Transactions on Geoscience and Remote Sensing, 50(4):1329-1339, April 2012. Keyword(s): focusing, image resolution, radar imaging, synthetic aperture radar, VHF devices, circular-aperture VHF-band synthetic aperture radar, vehicles, dense forest concealment, image resolution, object information, signal processing, imaging geometry, high-quality image focusing, contrast optimization, false-alarm rate, detection probability, frequency 20 MHz to 90 MHz, Focusing, Vehicles, Apertures, Radar tracking, Image resolution, Geometry, Circular aperture, forest concealment, synthetic aperture radar (SAR), target detection, very high frequency (VHF). [Abstract] [bibtex-entry]



10. Thomas K. Sjogren, Viet Thuy Vu, Mats I. Pettersson, A. Gustavsson, and Lars M. H. Ulander. Moving Target Relative Speed Estimation and Refocusing in Synthetic Aperture Radar Images. IEEE Trans. Aerosp. Electron. Syst., 48(3):2426-2436, July 2012. Keyword(s): SAR Processing, Moving Target indication, MTI, compensation, frequency-domain analysis, motion compensation, motion estimation, object detection, radar clutter, radar detection, radar imaging, radar tracking, synthetic aperture radar, ultra wideband radar, SAR imaging, UWB, cell migration, chirp estimator, clutter, frequency domain analysis, moving target refocusing, moving target relative speed estimation, moving target signal, phase compensation, synthetic aperture radar, target acceleration, ultra wideband, Approximation methods, Azimuth, Clutter, Estimation, Focusing, Image resolution, Synthetic aperture radar. [Abstract] [bibtex-entry]



11. Viet Thuy Vu, Thomas K. Sjogren, M.I. Pettersson, A. Gustavsson, and Lars M.H. Ulander. Detection of Moving Targets by Focusing in UWB SAR: Theory and Experimental Results. IEEE Trans. Geosci. Remote Sens., 48(10):3799 -3815, October 2010. Keyword(s): SAR Processing, UWB SAR, azimuth focusing, moving target detection, multichannel SAR data, reference system, reliable detection, signal-to-clutter noise ratio, single-channel SAR data, ultrawideband synthetic aperture radar, object detection, synthetic aperture radar, target tracking, ultra wideband radar;. [Abstract] [bibtex-entry]



12. Viet Thuy Vu, Thomas K. Sjogren, Mats I. Pettersson, L. Hakansson, A. Gustavsson, and Lars M. H. Ulander. RFI Suppression in Ultrawideband SAR Using an Adaptive Line Enhancer. IEEE Geosci. Remote Sens. Lett., 7(4):694-698, October 2010. Keyword(s): SAR Processing, RFI, radio frequency interference, RFI mitigation, interference suppression, least mean squares methods, radiofrequency interference, synthetic aperture radar, ultra wideband radar, RFI suppression, UWB low-frequency SAR data, adaptive line enhancer, least mean square algorithm, radiofrequency interference, ultrawideband low-frequency synthetic aperture radar, Adaptive control, Interference suppression, Least mean square algorithms, Line enhancers, Programmable control, Proposals, Radio frequency, Radiofrequency interference, Synthetic aperture radar, Ultra wideband technology, Adaptive line enhancer (ALE), CARABAS-II, normalized least mean square (LMS) (NLMS), radio-frequency interference (RFI), synthetic aperture radar (SAR), ultrawideband (UWB). [Abstract] [bibtex-entry]



13. Lars M. H. Ulander, Hans Hellsten, and Gunnar Stenström. Synthetic-Aperture Radar Processing Using Fast Factorized Back-Projection. IEEE Transactions on Aerospace and Electronic Systems, 39(3):760-776, July 2003. Keyword(s): SAR Processing, Fast Factorized Back-Projection, Time-Domain Back-Projection, TDBP, Back-Projection, Fast Back-Projection, Factorized Back-Projection, Ultra-Wideband SAR, VHF SAR, CARABAS, Airborne SAR. [Abstract] [bibtex-entry]



14. Per-Olov Frölind and Lars M. H. Ulander. Digital Elevation Map Generation Using VHF-Band SAR Data in Forested Areas. IEEE Transactions on Geoscience and Remote Sensing, 40(8):1769-1776, August 2002. Keyword(s): SAR Processing, Interferometry, DEM Generation, Time-Domain Back-Projection, Backprojection, Ultra-Wideband SAR, VHF SAR, CARABAS, Airborne SAR. [Abstract] [bibtex-entry]



15. X. Luo, Lars M. H. Ulander, J. Askne, G. Smith, and Per-Olov Frölind. RFI Suppression in Ultra-Wideband SAR Systems Using LMS Filters in Frequency Domain. Electronics Letters, 37(4):241-243, February 2001. Keyword(s): SAR Processing, RFI Suppression, Back-Projection, Ultra-Wideband SAR, VHF SAR, CARABAS, Airborne SAR. [Abstract] [bibtex-entry]



16. Lars M. H. Ulander and Per-Olov Frölind. Ultra-Wideband SAR Interferometry. IEEE Transactions on Geoscience and Remote Sensing, 36(5):1540-1550, September 1998. Keyword(s): SAR Processing, Interferometry, DEM Generation, Fourier-Hankel Inversion, Hankel Transform, Abel Transform, Ultra-Wideband SAR, VHF SAR, CARABAS, Airborne SAR. [Abstract] [bibtex-entry]



17. H. Israelsson, L. M. H. Ulander, J. L. H. Askne, J. E. S. Fransson, P.-O. Frölind, A. Gustavsson, and H. Hellsten. Retrieval of forest stem volume using VHF SAR. IEEE Trans. Geosci. Remote Sens., 35(1):36-40, January 1997. Keyword(s): SAR Processing, Forest, Forest parameters, biomass, 28 to 60 MHz, CARABAS, HF radar, Oland, SAR, Sweden, VHF radar, airborne radar, backscattering coefficient, biomass, coherent all radio band sensing, deciduous mixed forest, dense forest, discrimination, forest stem volume, forestry, geophysical measurement technique, horizontal dipole array, radar imaging, radar remote sensing, radar scattering, tree trunk, vegetation mapping, wood, airborne radar, forestry, geophysical techniques, radar cross-sections, radar imaging, remote sensing by radar, synthetic aperture radar. [Abstract] [bibtex-entry]



18. Lars M. H. Ulander. Radiometric slope correction of synthetic-aperture radar images. IEEE Transactions on Geoscience and Remote Sensing, 34(5):1115-1122, 1996. Keyword(s): SAR Processing, Radiometric Correction, Topography, geophysical techniques, radar imaging, remote sensing by radar, spaceborne radar, synthetic aperture radar, SAR, algorithm, calibration equation, fringe frequencies, geophysical measurement technique, land surface, maximum-likelihood estimator, radar remote sensing, radiometric slope correction, synthetic aperture radar image, terrain mapping, topographic height variation. [Abstract] [bibtex-entry]



19. J.O. Hagberg, L. M. H. Ulander, and J. Askne. Repeat-pass SAR interferometry over forested terrain. IEEE Trans. Geosci. Remote Sens., 33(2):331-340, March 1995. Keyword(s): SAR Processing, SAR interferometry, forest, forested terrain, forestry, general system model, geophysical method, interferometry, land surface topography, measurement technique, radar remote sensing, repeat pass method, scene scattering, synthetic aperture radar, topographic map, vegetation mapping, forestry, geophysical techniques, radar applications, radar imaging, remote sensing, remote sensing by radar, synthetic aperture radar, topography (Earth). [Abstract] [bibtex-entry]



20. Lars M. H. Ulander. Accuracy of Using Point Targets for SAR Calibration. IEEE Transactions on Aerospace and Electronic Systems, 27(1):139-148, January 1991. Keyword(s): SAR Processing, Radiometric Calibration, calibration, measurement errors, radar, radiometry, remote sensing by radar, RMS errors, SAR calibration, equivalent rectangle system resolution, impulse response, integral method, nonlinear phase errors, reference point targets, synthetic aperture radar, system focus. [Abstract] [bibtex-entry]

Conference articles

1. Jan Torgrimsson, Patrik Dammert, Hans Hellsten, and Lars M. H. Ulander. Autofocus and analysis of geometrical errors within the framework of fast factorized back-projection. In Edmund Zelnio and Frederick D. Garber, editors, Proc. SPIE, volume 9093, pages 909303-909303-16, 2014. International Society for Optics and Photonics, SPIE. Keyword(s): SAR Processing, Fast-Factorized Back-Projection, FFBP, Time-Domain Back-Projection, TDBP, Autofocus, SAR Autofocus, Geometrical Autofocus, Airborne SAR, CARABAS, factorized geometrical autofocus algorithm, fast factorized back-projection chain, gain 3 dB, intensity correlation, object function, peak-to-sidelobe ratio measurement, radar imaging, residual space variant range cell migration, ultrawideband synthetic aperture radar processing, Apertures, Electronics packaging, Geometry, Radar tracking, Synthetic aperture radar, Transforms, Autofocus, back-projection, phase gradient algorithm, PGA, synthetic aperture radar (SAR). [Abstract] [bibtex-entry]



2. A. Wyholt and Lars M. H. Ulander. Evaluating VHF-band SAR autofocus algorithms using a forest backscatter model. In Proc. IEEE Int. Geosci. Remote Sens. Symp., volume 4, pages 9-12, July 2009. Keyword(s): SAR Processing, Autofocus, Time-Domain Back-Projection, TDBP, FFBP, SAR subimages, VHF-band SAR autofocus algorithms, fast factorized back-projection algorithm, forest backscatter model, forest clutter model, matching error, residual displacement errors, subimage matching, backscatter, focusing, geophysical image processing, image matching, remote sensing by radar, synthetic aperture radar. [Abstract] [bibtex-entry]



3. Per-Olov Frölind and Lars M. H. Ulander. Evaluation of angular interpolation kernels in fast back-projection SAR processing. In IEE Proceedings -- Radar, Sonar and Navigation, volume 153, pages 243-249, June 2006. Keyword(s): SAR Processing, Time-Domain Back-Projection, Back-Projection, Fast Factorized Back-Projection, Comparison of Algorithms, interpolation, interpolation kernels, angular interpolation kernels, radar imaging, synthetic aperture radar, ultra wideband radar, UWB SAR, interpolation method, phase error, polar version, subimage version, time domain SAR algorithm, Factorized Backprojection. [Abstract] [bibtex-entry]



4. B. Hallberg, G. Smith, A. Olofsson, and Lars M. H. Ulander. Performance Simulation of Spaceborne P-band SAR for Global Biomass Retrieval. In IGARSS '04, International Geoscience and Remote Sensing Symposium, September 2004. Keyword(s): SAR Processing, Simulation, P-Band, Biomass Retrieval, Forest. [Abstract] [bibtex-entry]



5. Lars M. H. Ulander, Per-Olov Frölind, A. Gustavsson, H. Hellsten, T. Jonsson, B. Larsson, and G. Stenstrom. Performance of the CARABAS-II VHF-Band Synthetic Aperture Radar. In IGARSS '01, International Geoscience and Remote Sensing Symposium, volume 1, pages 129 - 131, Jul. 2001. Keyword(s): SAR Processing, RFI Suppression, Back-Projection, Ultra-Wideband SAR, Time-Domain Back-Projection, TDBP, VHF SAR, CARABAS, Airborne SAR. [Abstract] [bibtex-entry]



6. Lars M. H. Ulander, Hans Hellsten, and Gunnar Stenström. Performance analysis of fast backprojection for synthetic-aperture radar processing. In Edmund G. Zelnio, editor, Proc. of SPIE Vol. 4382, Algorithms for Synthetic Aperture Radar Imagery VIII, number 1, pages 13-21, 2001. SPIE. Keyword(s): SAR Processing, Back-Projection, Time-Domain Back-Projection, TDBP, Fast Back-Projection, inversion. [Abstract] [bibtex-entry]



7. Lars M. H. Ulander and Per-Olov Frölind. Precision Processing of CARABAS HF/VHF-Band SAR Data. In IGARSS '99, International Geoscience and Remote Sensing Symposium, volume 1, pages 47-49, June 1999. Keyword(s): SAR Processing, RFI Suppression, Back-Projection, Time-Domain Back-Projection, TDBP, Ultra-Wideband SAR, VHF SAR, CARABAS, Airborne SAR, Motion Compensation. [Abstract] [bibtex-entry]



8. H. Hellsten, Lars M. H. Ulander, A. Gustavsson, and B. Larsson. Development of VHF CARABAS II SAR. In Proc. SPIE, volume 2747, pages 48-60, June 1996. [bibtex-entry]

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This collection of SAR literature is far from being complete.
It is rather a collection of papers which I store in my literature data base. Hence, the list of publications under PUBLICATIONS OF AUTHOR'S NAME should NOT be mistaken for a complete bibliography of that author.

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