Stefan V. Baumgartner
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View article: Efficient Size and Heading Angle Estimation of Ships in SAR and ISAR Images
Efficient Size and Heading Angle Estimation of Ships in SAR and ISAR Images Open
For maritime security applications it is advantageous or even required, that additionally to the geographical positions and moving directions the dimensions of the detected ships are available for subsequent classification and recognition …
View article: Road Surface Roughness Estimation Using Spaceborne Synthetic Aperture Radar
Road Surface Roughness Estimation Using Spaceborne Synthetic Aperture Radar Open
Road surface roughness is a major factor that is responsible for the skid resistance of vehicles and, thus, road safety. Therefore, it needs to be monitored regularly to ensure that the roughness values are in the optimal range and to perf…
View article: Machine Learning Approaches for Road Condition Monitoring Using Synthetic Aperture Radar
Machine Learning Approaches for Road Condition Monitoring Using Synthetic Aperture Radar Open
Airborne Synthetic Aperture Radar (SAR) has the potential to monitor remotely the road traffic infrastructure on a large scale. Of particular interest is the road surface roughness, which is an important road safety parameter. For this tas…
View article: Ship Detection Based on Faster R-CNN Using Range-Compressed Airborne Radar Data
Ship Detection Based on Faster R-CNN Using Range-Compressed Airborne Radar Data Open
Near real-time ship monitoring is crucial for ensuring safety and security at sea. Established ship monitoring systems are the automatic identification system (AIS) and marine radars. However, not all ships are committed to carry an AIS tr…
View article: Phase Correction for Accurate DOA Angle and Position Estimation of Ground-Moving Targets Using Multi-Channel Airborne Radar
Phase Correction for Accurate DOA Angle and Position Estimation of Ground-Moving Targets Using Multi-Channel Airborne Radar Open
Accurate position estimation of the ground moving targets is a crucial requirement for any radar-based surveillance system. For multi-channel airborne radar, the target position on ground can be accurately obtained by estimating the direct…
View article: Approaches for Road Surface Roughness Estimation Using Airborne Polarimetric SAR
Approaches for Road Surface Roughness Estimation Using Airborne Polarimetric SAR Open
The road surface roughness is an important parameter that determines the quality of a road network. It has a direct influence on the grip and skid resistance of the vehicles. For this reason, this parameter has to be periodically monitored…
View article: Direction-of-Arrival Angle and Position Estimation for Extended Targets Using Multichannel Airborne Radar Data
Direction-of-Arrival Angle and Position Estimation for Extended Targets Using Multichannel Airborne Radar Data Open
Direction-of-arrival (DOA) angle estimation is a prerequisite for projecting the airborne radar-based target detections to ground via a geocoding operation. Most state-of-the-art DOA angle estimation methods assume one detection per target…
View article: Tracking and Track Management of Extended Targets in Range-Doppler Using Range-Compressed Airborne Radar Data
Tracking and Track Management of Extended Targets in Range-Doppler Using Range-Compressed Airborne Radar Data Open
Ship tracking facilitates a comprehensive insight of maritime traffic situation and ensures its safety and security. However, with the current operational surveillance systems detecting several maritime threats is still a major challenge. …
View article: The High-Resolution Digital-Beamforming Airborne SAR System DBFSAR
The High-Resolution Digital-Beamforming Airborne SAR System DBFSAR Open
Synthetic Aperture Radar (SAR) is an established remote sensing technique that can robustly provide high-resolution imagery of the Earth’s surface. However, current space-borne SAR systems are limited, as a matter of principle, in achievin…
View article: MONOPOL - A traveling-wave magnetic neutron spin resonator for tailoring polarized neutron beams
MONOPOL - A traveling-wave magnetic neutron spin resonator for tailoring polarized neutron beams Open
We report on first experimental tests of a neutron magnetic spin resonator at a very cold neutron beam port of the high flux reactor at the ILL Grenoble. When placed between two supermirror neutron polarizers and operated in a pulsed trave…
View article: Promising Techniques for Future Maritime Surveillance Demonstrated With DLR's Airborne Radar Sensors F-SAR and DBFSAR
Promising Techniques for Future Maritime Surveillance Demonstrated With DLR's Airborne Radar Sensors F-SAR and DBFSAR Open
The Microwaves and Radar Institute of DLR operates the airborne synthetic aperture (SAR) radar sensors F-SAR and DBFSAR. These sensors are used for investigating and demonstrating novel radar and signal processing techniques for a number o…
View article: Fast post-Doppler STAP with road map for traffic monitoring: overview and first results
Fast post-Doppler STAP with road map for traffic monitoring: overview and first results Open
Synthetic aperture radar (SAR) is an efficient solution for road traffic monitoring due to its high spatial resolution and independence from daylight and weather conditions. In this sense, a number of ground moving target indication (GMTI)…
View article: Range-Doppler Based CFAR Ship Detection with Automatic Training Data Selection
Range-Doppler Based CFAR Ship Detection with Automatic Training Data Selection Open
Ship detection is an essential maritime security requirement. Current state-of-the-art synthetic aperture radar (SAR) based ship detection methods employ fully focused images. The time-consuming processing efforts required to generate thes…
View article: Design and realization of future compact external-cavity diode laser systems
Design and realization of future compact external-cavity diode laser systems Open
Compact and robust external-cavity diode laser (ECDL) systems are a mandatory requirement for many next-generation quantum technology applications, e.g. quantum communication and quantum sensors. Today’s commercially available ECDLs are us…
View article: HAPS: Potentials, Applications and Requirements for Radar Remote Sensing
HAPS: Potentials, Applications and Requirements for Radar Remote Sensing Open
High Altitude Pseudo-Satellites (HAPS) are future platforms flying in the stratosphere. Owing to the expected long endurance, missions lasting for several weeks, months or even years are possible. This property makes HAPS very attractive a…
View article: Die Flutkatastrophe von Simbach am Inn im Juni 2016 aus Sicht eines hochauflösenden abbildenden Radarsystems
Die Flutkatastrophe von Simbach am Inn im Juni 2016 aus Sicht eines hochauflösenden abbildenden Radarsystems Open
Im Juli 2016 kam es zu einer verheerenden Flutkatastrophe in der der Region Simbach am Inn. Vierzehn Tage nach der Katastrophe hatte das Institut für Hochfrequenztechnik und Radarsysteme des DLR Gelegenheit, das Gebiet großflächig von Pfar…
View article: Novel post-Doppler STAP with a priori knowledge information for traffic monitoring applications: basic idea and first results
Novel post-Doppler STAP with a priori knowledge information for traffic monitoring applications: basic idea and first results Open
This paper presents a novel a priori knowledge-based algorithm for traffic monitoring applications. The powerful post-Doppler space-time adaptive processing (PD STAP) is combined with a known road network obtained from the freely available…
View article: Experimental Verification of High-Resolution Wide-Swath Moving Target Indication
Experimental Verification of High-Resolution Wide-Swath Moving Target Indication Open
Recently we have introduced a set of novel low pulse repetition frequency (PRF) algorithms, which allow for simultaneous high-resolution wide-swath (HRWS) SAR imaging and moving target indication (MTI) without the need of changing the syst…
View article: 5.5 - Usability of LTE for Transmitting Radar Data from DLR’s Research Aircraft DO 228-212
5.5 - Usability of LTE for Transmitting Radar Data from DLR’s Research Aircraft DO 228-212 Open
In the paper the usability of long term evolution (LTE) data transmission from an aircraft to the ground is investigated. Theoretical analyses and experimental measurements have been carried out by using a commercial low-cost LTE modem and…
View article: Intra-cavity frequency-doubled mode-locked semiconductor disk laser at 325 nm
Intra-cavity frequency-doubled mode-locked semiconductor disk laser at 325 nm Open
We present a passively mode-locked semiconductor disk laser (SDL) emitting at 650nm with intra-cavity second harmonic generation to the ultraviolet (UV) spectral range. Both the gain and the absorber structure contain InP quantum dots (QDs…