Search results for: Jochen Horstmann

Items from 1 to 20 out of 29 results

article

Video-Based Estimation of Surface Currents Using a Low-Cost Quadcopter

Michael Streser, Ruben Carrasco, Jochen Horstmann

IEEE Geoscience and Remote Sensing Letters > 2017 > 14 > 11 > 2027 - 2031

Video imagery of surface waves recorded from a small off-the-shelf quadcopter with a self-stabilizing camera gimbal is analyzed to estimate the surface current field. The nadir looking camera acquires a short image sequence, which is geocoded to Universal Transverse Mercator coordinates. The resulting image sequence is used to quantify characteristic parameters (wavelength, period, and direction)...

article

Significant Wave Height Measured by Coherent X-Band Radar

Ruben Carrasco, Jochen Horstmann, Jorg Seemann

IEEE Transactions on Geoscience and Remote Sensing > 2017 > 55 > 9 > 5355 - 5365

Significant wave height is one of the most important parameters for characterizing ocean waves and essential for coastal protection, shipping, as well as off shore industry operations. Within this paper, a robust method is introduced for retrieving significant wave heights from Doppler speed measurements acquired with a coherent-on-receive marine radar. The Doppler velocity is caused by the surface...

chapter

Wave monitoring based on a Dopplerized marine radar

Jochen Horstmann, Ruben Carrasco, Joerg Seemann, Michael Stresser, more

2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS) > 2969 - 2970

IGARSS 2017 - 2017 IEEE International Geoscience and Remote Sensing Symposium

At the Helmholtz Zentrum Geesthacht (HZG), Germany an oceanic monitoring system, based on a Dopplerized microwave radar was developed. The focus of this paper is on the wave measurement methodology and applicability of this system. In addition, to the spectral wave properties such as peak wave period, peak wave direction and significant wave height, the system is capable of measuring, wave breaking,...

article

Surface Current Measurements Using X-Band Marine Radar With Vertical Polarization

Weimin Huang, Ruben Carrasco, Chengxi Shen, Eric W. Gill, more

IEEE Transactions on Geoscience and Remote Sensing > 2016 > 54 > 5 > 2988 - 2997

In this paper, the retrieval of sea surface current velocity from vertically polarized (V-pol) X-band marine radar data is presented. Three different methods, including the iterative least square approach, the normalized scalar product method, and the polar current shell algorithm, that have been used for horizontally polarized data are employed here. A comprehensive comparison of the performance...

article

Maritime surveillance with multiple over-the-horizon HFSW radars: An overview of recent experimentation

Paolo Braca, Salvatore Maresca, Raffaele Grasso, Karna Bryan, more

IEEE Aerospace and Electronic Systems Magazine > 2015 > 30 > 12 > 4 - 18

Maritime surveillance (MS) is an important domain for many national and international institutions, agencies, and bodies. In this context, the MS initiatives are aimed to enhance search and rescue operations, provide effective response to accidents and disasters, monitor fisheries, prevent pollution and support law enforcement and national defence. This means that it is of vital importance to generate...

chapter

Knowledge-based ship tracking applied to HF surface wave radar data

Gemine Vivone, Paolo Braca, Jochen Horstmann

2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS) > 326 - 329

2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)

In recent years, low-power high-frequency surface-wave radars have received significant attention thanks to their over-the-horizon coverage capability and the continuous-time operation mode. These radars have become effective long-range early-warning tools for maritime situational awareness applications. In this paper a knowledge-based multi-target tracking algorithm is described. The advantages in...

article

Knowledge-Based Multitarget Ship Tracking for HF Surface Wave Radar Systems

Gemine Vivone, Paolo Braca, Jochen Horstmann

IEEE Transactions on Geoscience and Remote Sensing > 2015 > 53 > 7 > 3931 - 3949

These last decades spawned a great interest toward low-power high-frequency (HF) surface-wave (SW) radars for ocean remote sensing. By virtue of their over-the-horizon coverage capability and continuous-time mode of operation, these sensors are also effective long-range early warning tools in maritime situational awareness applications providing an additional source of information for target detection...

article

Tropical Cyclone Winds Retrieved From C-Band Cross-Polarized Synthetic Aperture Radar

Jochen Horstmann, Silvia Falchetti, Christopher Wackerman, Salvatore Maresca, more

IEEE Transactions on Geoscience and Remote Sensing > 2015 > 53 > 5 > 2887 - 2898

This paper presents a geophysical model function (GMF) that has been developed to describe the relation of the ocean surface wind with the normalized radar cross section (NRCS) at C-band cross polarization (cross-pol). Synthetic aperture radar (SAR) images have been simultaneously collected at copolarization (co-pol) and cross-pol at moderate to high wind speeds. Using the SAR co-pol retrieved wind...

chapter

Variable structure interacting multiple model algorithm for ship tracking using HF surface wave radar data

Gemine Vivone, Paolo Braca, Jochen Horstmann

OCEANS 2015 - Genova > 1 - 8

OCEANS 2015 - Genova

These last decades spawned a great interest towards low-power High-Frequency (HF) Surface-Wave (SW) radars for ocean remote sensing. By virtue of their over-the-horizon coverage capability and continuous-time mode of operation, these sensors are also effective long-range early-warning tools in maritime situational awareness applications. In this paper we show how it is possible to take advantage of...

chapter

The impact of sea state on HF surface-wave radar ship detection and tracking performances

Salvatore Maresca, Paolo Braca, Raffaele Grasso, Jochen Horstmann

OCEANS 2015 - Genova > 1 - 5

OCEANS 2015 - Genova

Nowadays, we face an ever increasing interest in new technologies and solutions for the maritime surveillance (MS) domain. In such a context, oceanographic high-frequency surface-wave (HFSW) radars have started to get significant attention. In fact, they are operated to provide remote sensing information of wide open-sea areas, but they may also contribute with useful cost-effective track-based information...

chapter

Accuracy of wave direction estimation from directional wave rider buoy time series

Joerg Seemann, Jochen Horstmann, Lasse Lueder, Burkard Baschek, more

2015 IEEE/OES Eleveth Current, Waves and Turbulence Measurement (CWTM) > 1 - 3

2015 IEEE/OES Eleventh Current, Waves and Turbulence Measurement (CWTM)

The directionality of single-wave events measured with a directional waverider buoy is analyzed. The method used for directionality analysis is presented and an estimation of the achievable accuracy, based on the bootstrap method is given.

chapter

Oceanographic HF surface-wave radars for maritime surveillance in the German Bight

Salvatore Maresca, Paolo Braca, Raffaele Grasso, Jochen Horstmann, more

OCEANS 2014 - TAIPEI > 1 - 6

OCEANS 2014 - TAIPEI

In maritime surveillance systems, providing realtime, clear and accurate pictures of wide areas is essential for the human decision-making process. In such a context, oceanographic high-frequency surface-wave (HFSW) radars could be cost-effective sensors for long-range early-warning ship detection and tracking. In this paper, multi-target tracking and data fusion techniques are applied to real data...

chapter

Coherent microwave radar backscatter from shoaling and breaking sea surface waves

Joerg Seemann, Michael Stresser, Friedwart Ziemer, Jochen Horstmann, more

OCEANS 2014 - TAIPEI > 1 - 5

OCEANS 2014 - TAIPEI

This paper presents the dynamic features of gravity waves based on coherent radar observations. We demonstrate that it is practical to detect wave breaking events via the sea surface backscattering intensity and Doppler velocity. Both parameters are acquired from coherent X-band radars operating at grazing incidence. Our measurements show a range dependency of the Doppler velocity which results from...

article

Maritime Surveillance Using Multiple High-Frequency Surface-Wave Radars

Salvatore Maresca, Paolo Braca, Jochen Horstmann, Raffaele Grasso

IEEE Transactions on Geoscience and Remote Sensing > 2014 > 52 > 8 > 5056 - 5071

In the last decades, great interest has been directed toward low-power high-frequency (HF) surface-wave radars as long-range early warning tools in maritime-situational-awareness applications. These sensors, developed for ocean remote sensing, provide an additional source of information for ship detection and tracking, by virtue of their over-the-horizon coverage capability and continuous-time mode...

chapter

Multiple oceanographic HF surface-wave radars applied to maritime surveillance

Salvatore Maresca, Paolo Braca, Raffaele Grasso, Jochen Horstmann

17th International Conference on Information Fusion (FUSION) > 1 - 8

2014 17th International Conference on Information Fusion - (FUSION 2014)

In the context of maritime surveillance, low-power high-frequency surface-wave (HFSW) radars are attracting significant attention as cost-effective tools for long-range ship detection and tracking applications. In this paper, multi-target tracking and data fusion techniques are applied to live-recorded data from a network of three oceanographic HFSW radars installed on the coast of the German Bight,...

chapter

Detection, tracking and fusion of multiple HFSW radars for ship traffic surveillance: Experimental performance assessment

Salvatore Maresca, Paolo Braca, Jochen Horstmann

2013 IEEE International Geoscience and Remote Sensing Symposium - IGARSS > 2420 - 2423

IGARSS 2013 - 2013 IEEE International Geoscience and Remote Sensing Symposium

Low-power HF surface-wave radars fit well the role of long-range early-warning tools in maritime situational awareness applications, by virtue of their over-the-horizon coverage capability and continuous-time mode of operation. In fact, these sensors, developed for ocean remote sensing, can represent also a further low-cost source of information for ship detection and tracking. Unfortunately, many...

chapter

Test of an advanced algorithm to retrieve complex wind fields over the black sea from Envisat SAR images

Werner Alpers, Alexis Mouche, Jochen Horstmann, Andrei Ivanov, more

2013 IEEE International Geoscience and Remote Sensing Symposium - IGARSS > 1262 - 1265

IGARSS 2013 - 2013 IEEE International Geoscience and Remote Sensing Symposium

Several algorithms have been proposed to retrieve near-surface wind fields from C-band synthetic aperture radar (SAR) images acquired over the ocean. They mainly differ in the way how to retrieve wind direction. Conventionally, the wind direction is taken from an atmospheric model or extracted from linear features visible on SAR images. Recently a new wind retrieval algorithm has been proposed by...

chapter

Data fusion performance of HFSWR Systems for ship traffic monitoring

Salvatore Maresca, Paolo Braca, Jochen Horstmann

Proceedings of the 16th International Conference on Information Fusion > 1273 - 1280

2013 16th International Conference on Information Fusion (FUSION 2013)

In Maritime Situational Awareness (MSA), low-power High-Frequency Surface-Wave (HFSW) radars fit the role of long-range early-warning tools by virtue of their over-the-horizon (OTH) coverage. Unfortunately these sensors, developed mainly for ocean remote sensing applications, exhibit poor range and azimuth resolution, high non-linearity and significant false alarm rate due to clutter and interference.

article

Experimental Evaluation of the Range–Doppler Coupling on HF Surface Wave Radars

Luigi Bruno, Paolo Braca, Jochen Horstmann, Michele Vespe

IEEE Geoscience and Remote Sensing Letters > 2013 > 10 > 4 > 850 - 854

High-frequency surface wave radar (HFSWR) is used in oceanography to monitor surface wind waves and currents and, more recently, to detect ships in maritime surveillance. The radar accuracy is affected by range–Doppler coupling, which yields a displacement in the measured range proportional to the target radial velocity, i.e., the Doppler shift in the returned pulse. Although in oceanography this...

chapter

Data fusion performance of HFSWR systems for ship traffic monitoring

Salvatore Maresca, Paolo Braca, Jochen Horstmann

Proceedings of the 16th International Conference on Information Fusion > 547 - 554

2013 16th International Conference on Information Fusion (FUSION 2013)

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INFONA - science communication portal

Search results for: Jochen Horstmann

Video-Based Estimation of Surface Currents Using a Low-Cost Quadcopter

Significant Wave Height Measured by Coherent X-Band Radar

Wave monitoring based on a Dopplerized marine radar

Surface Current Measurements Using X-Band Marine Radar With Vertical Polarization

Maritime surveillance with multiple over-the-horizon HFSW radars: An overview of recent experimentation

Knowledge-based ship tracking applied to HF surface wave radar data

Knowledge-Based Multitarget Ship Tracking for HF Surface Wave Radar Systems

Tropical Cyclone Winds Retrieved From C-Band Cross-Polarized Synthetic Aperture Radar

Variable structure interacting multiple model algorithm for ship tracking using HF surface wave radar data

The impact of sea state on HF surface-wave radar ship detection and tracking performances

Accuracy of wave direction estimation from directional wave rider buoy time series

Oceanographic HF surface-wave radars for maritime surveillance in the German Bight

Coherent microwave radar backscatter from shoaling and breaking sea surface waves

Maritime Surveillance Using Multiple High-Frequency Surface-Wave Radars

Multiple oceanographic HF surface-wave radars applied to maritime surveillance

Detection, tracking and fusion of multiple HFSW radars for ship traffic surveillance: Experimental performance assessment

Test of an advanced algorithm to retrieve complex wind fields over the black sea from Envisat SAR images

Data fusion performance of HFSWR Systems for ship traffic monitoring

Experimental Evaluation of the Range–Doppler Coupling on HF Surface Wave Radars

Data fusion performance of HFSWR systems for ship traffic monitoring

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