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The EnMAP imaging spectroscopy mission towards operations

REMOTE SENSING OF ENVIRONMENT 2023年第1期294卷

作者： Storch, Tobias Honold, Hans-Peter Chabrillat, Sabine Habermeyer, Martin Tucker, Paul Brell, Maximilian Ohndorf, Andreas Wirth, Katrin Betz, Matthias Kuchler, Michael Muehle, Helmut Carmona, Emiliano Baur, Simon Muecke, Martin Loew, Sebastian Schulze, Daniel Zimmermann, Steffen Lenzen, Christoph Wiesner, Sebastian Aida, Saika Kahle, Ralph Willburger, Peter Hartung, Sebastian Dietrich, Daniele Plesia, Nicolae Tegler, Mirco Schork, Katharina Alonso, Kevin Marshall, David Gerasch, Birgit Schwind, Peter Pato, Miguel Schneider, Mathias de los Reyes, Raquel Langheinrich, Maximilian Wenzel, Julian Bachmann, Martin Holzwarth, Stefanie Pinnel, Nicole Guanter, Luis Segl, Karl Scheffler, Daniel Foerster, Saskia Bohn, Niklas Bracher, Astrid Soppa, Mariana A. Gascon, Ferran Green, Rob Kokaly, Raymond Moreno, Jose Ong, Cindy Sornig, Manuela Wernitz, Ricarda Bagschik, Klaus Reintsema, Detlef La Porta, Laura Schickling, Anke Fischer, Sebastian Earth Observat Ctr EOC German Aerosp Ctr DLR Wessling Germany Earth Observat Ctr EOC German Aerosp Ctr DLR Neustrelitz Germany Earth Observat Ctr EOC German Aerosp Ctr DLR Berlin Germany German Space Operat Ctr GSOC German Aerosp Ctr DLR Wessling Germany OHB Syst AG Wessling Germany EOMAP GmbH & Co KG Seefeld Germany GFZ German Res Ctr Geosci Potsdam Germany Leibniz Univ Hannover Inst Soil Sci Hannover Germany Univ Politecn Valencia Res Inst Water & Environm Engn IIAMA Valencia Spain Helmholtz Ctr Polar & Marine Res Alfred Wegener Inst AWI Bremerhaven Germany European Space Agcy ESA Frascati Italy Jet Prop Lab JPL Natl Aeronaut & Space Agcy NASA Pasadena CA USA Geol Geophys & Geochem Sci Ctr US Geol Survey USGS Lakewood CO USA Univ Valencia Fac Phys Dept Earth Phys & Thermodynam Valencia Spain Commonwealth Sci & Ind Res Org CSIRO Bentley WA Australia German Aerosp Ctr DLR Space Agcy Bonn Germany

EnMAP (Environmental Mapping and Analysis Program) is a high-resolution imaging spectroscopy remote sensing mission that was successfully launched on April 1st, 2022. Equipped with a prism-based dual -spectrometer, EnMAP performs observations in the spectral range between 418.2 nm and 2445.5 nm with 224 bands and a high radiometric and spectral accuracy and stability. EnMAP products, with a ground instantaneous field-of-view of 30 mx 30 m at a swath width of 30 km, allow for the qualitative and quantitative analysis of surface variables from frequently and consistently acquired observations on a global scale. This article presents the EnMAP mission and details the activities and results of the Launch and Early Orbit and Commissioning Phases until November 1st, 2022. The mission capabilities and expected performances for the operational Routine Phase are provided for existing and future EnMAP users.

关键词： EnMAP Imaging spectroscopy Satellite mission operations Calibrations image processors Data quality assessments and independent product validations

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Machine vision-based guidance system for an agricultural small-grain harvester

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TRANSACTIONS OF THE ASAE 2003年第4期46卷 1255-1264页

作者： Benson, ER Reid, JF Zhang, Q Univ Delaware Dept Bioresource Engn Expt Stn Newark DE 19717 USA Deere & Co Intelligent Vehicle Syst Champaign IL USA Univ Illinois Dept Agr Engn Urbana IL 61801 USA

A machine vision guidance system was developed for an agricultural combine harvester The guidance algorithm separated the uncut crop rows from the surrounding background material, parameterized the crop rows, and calculated a guidance signal, A single monochrome camera mounted on the cab of the combine supplied the crop images. The algorithm was developed for corn and was tested under both laboratory and field conditions. Test results showed that the algorithm was capable of accurately locating crop rows in the image and providing a satisfactory lateral position signal for automated combine guidance. At a speed of 1.3 m/s (3 mph), the system was capable of guiding the combine at the same accuracy level as the GPS recording system available.

关键词： automatic guidance automatic steering automation combine harvesters control controllers corn fuzzy logic GPS harvesters harvesting image processing image processors machine vision

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Pipeline architecture of specialized reconfigurable processors in FPGA structures for real-time image pre-processing 24

Pipeline architecture of specialized reconfigurable processo...

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24th EUROMICRO Conference

作者： Wiatr, K AGH Tech Univ Inst Elect Cracow Poland

ISBN: (纸本)0818686464

This article presents considerations concerning the choice of a multiprocessor unit architecture for fast realization of the tasks connected with initial processing of visual images. Basing on the earlier experience of the author within the scope of the real time systems, implementation in pipeline architecture of specialized hardware processor assembled on the basis of FPGA programmable structures was suggested. In particular, implementation of the following processor :has been prepared: median filtration, convolution, look-up-table recording, logic processor, histogram count-up and morphological processors. Experimental work has also been done, in order to verify the concept assumed, whose results associated with delay times are included in the article. A structure of universal reconfigurable processor has been moreover offered. The works have been financed by the Polish Scientific Research Committee.

关键词： image processors FPGAs real-time systems reconfigurable systems

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More on gain adaptive tracking

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JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 1997年第5期20卷 882-890页

作者： Sworder, DD Boyd, JE University of California San Diego La Jolla California 92093-0407

Tracking an agile target is made difficult by a multiplicity of possible motion modes, An earlier paper (Sworder, D.D., Vojak, R., and Hutchins, R. G., ''Gain Adaptive Tracking'' Journal of Guidance, Control, and dynamics, Vol. 16, No. 5, 1993, pp. 865-873) described how measurements of the spatially extended features of the target can be used to create a tracker that can follow a jinking motion. The earlier algorithm is extended to include discontinuities in the target path. The tracker is only slightly more complex than that for continuous paths. The response of the proposed tracker is shown by example to be superior to both an extended Kalman filter and the earlier gain adaptive tracker.

关键词： Radar Measurement Interacting Multiple Model Brownian Motion Computing Naval Surface Warfare Radiation Pattern Adaptive Control Antiship Missile Nonlinear Systems image processors

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MULTISTAGE INTEGRATION MODEL FOR HUMAN EGOMOTION PERCEPTION

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JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 1995年第5期18卷 937-944页

作者： ZACHARIAS, GL MIAO, AX WARREN, R ARMSTRONG LAB WRIGHT PATTERSON AFB OH 45433 USA

Human computational vision models that attempt to account for the dynamic perception of egomotion and relative depth typically assume a common three-stage process: first, compute the optical flow field based on the dynamically changing image;second, estimate the egomotion states based on the flow;and third, estimate the relative depth/shape based on the egomotion states and possibly on a model of the viewed surface. We propose a model more in line with recent work in human vision, employing multistage integration. Here the dynamic image is first processed to generate spatial and temporal image gradients that drive a mutually interconnected state estimator and depth/shape estimator. The state estimator uses the image gradient information in combination with a depth/shape estimate of the viewed surface and an assumed model of the viewer's dynamics to generate current state estimates;in tandem, the depth/shape estimator uses the image gradient information in combination with the viewer's state estimate and assumed shape model to generate current depth/shape estimates. In this paper, we describe the model and compare model predictions with empirical data.

关键词： image Gradient Extended Kalman Filter Computer Vision Monte Carlo Simulation Flight Simulation image processors Dead Reckoning Cockpit High Speed Civil Transport Flight Path Angle

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TRACKING MOBILE VEHICLES USING A NON-MARKOVIAN MANEUVER MODEL

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JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 1994年第4期17卷 870-872页

作者： SWORDER, DD VOJAK, R INRIA ROCQUENCOURT F-78153 LE CHESNAYFRANCE

A study is conducted of the performance improvements achievable by an image-enhanced tracking filter as the maneuver model used is rendered more accurate. The gain-adaptive extended Kalman filter used is sufficiently ... 详细信息

关键词： Extended Kalman Filter image processors Track Algorithm Velocity Profiles Brownian Motion White Noise

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AEROOPTICAL PHASE MEASUREMENTS USING FOURIER-TRANSFORM HOLOGRAPHIC-INTERFEROMETRY

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AIAA JOURNAL 1993年第3期31卷 426-433页

作者： HAVENER, G KIRBY, D Arnold Engineering Development Center Arnold Air Force Base Tennessee 37389

Arnold Engineering Development Center's current capability to determine optical phase from holographic interferograms using the Fourier transform method is described. Video images of interferograms are digitized into 0-255 grey level intensity arrays nominally 1000 pixels square. One-dimensional discrete Fourier transforms and digital filtering are used to compute the optical phase for each pixel which thereby generates high-resolution phase maps for the interferograms. The phase data are reduced according to the application. For serodynamic flowfields, density distributions for two-dimensional and axisymmetric flows are obtained and the current capability is applied to an interferogram of Mach 6 airflow over an axisymmetric sharp tip cone at zero angle of attack. For aero-optics testing, statistics such as one- and two-dimensional spatial correlations, integral scales, means, variances, and peak-to-valley rms values for the phase fluctuations are reducible as are calculations for performance parameters such as optical transfer and point spread functions, Strehl losses, and encircled energy diagrams. Current capability is demonstrated by application to interferograms of Mach 8 high Reynolds number airflow between parallel flat plates.

关键词： Aerodynamic Flowfield Frequency Domain Freestream Conditions Angle of Attack Turbulent Boundary Layer Track Algorithm Stagnation Pressure image processors Reacting Flow Turbulence Intensity

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COUPLING OF TETHER LATERAL VIBRATION AND SUBSATELLITE ATTITUDE MOTION

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JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 1992年第5期15卷 1284-1287页

作者： BERGAMASCHI, S BONON, F University of Padova Padova 35131 Italy

A relatively simple model is used to study the coupling between tether taut string vibrations and satellite pendulous oscillations in the linear regime. The numerical values adopted to obtain the results presented are pertinent to the Tethered Satellite System - Mission 1, and particular attention is given to the half-sine deflection of the tether, in view of the amount of energy stored in it. The results confirm that if the skip-rope mode is excited during retrieval, a considerable amount of energy can be transferred to the satellite during the last phase. (P.D.)

关键词： Satellites Automatic Control Kalman Filter Tethered Satellite System Numerical Simulation Track Algorithm Aircraft Maneuvers String Vibration Attitude Dynamics image processors

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IMPROVED TRACKING OF AN AGILE TARGET

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JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 1992年第5期15卷 1281-1284页

作者： SWORDER, DD HUTCHINS, RG UNIV CALIF SAN DIEGO DEPT ELECT & COMP ENGN LA JOLLA CA 92093 USA ORINCON CORP SAN DIEGO CA 92121 USA

A path-adaptive estimation algorithm is proposed for tracking an agile target. It is assumed that the conventional center-of-reflection sensor suite is augmented with an imager; i.e., in addition to range-bearing measurements, a sequence of 'pictures' of the target is created. A brief study of the advantages that accrue to image enhancement is presented.

关键词： Linear Quadratic Regulator Track Algorithm Optimal Control image processors Longitudinal Stability Augmentation System Cartesian Coordinate System Automatic Control Pilot Tethered Satellite System Flying Qualities

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Multifunctional Optical image Processor

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光电工程 1992年第5期 22-30页

作者： David Casasent Carnegie Mellon University Center for Excellence in Optical Data Processing Department of Electrical and Computer Engineering Pittsburgh. PA 15213. USA

A multifunctional optical imagc processor capable of morphological,feature extraction and correlation operations for low,medium and high-level computervision is described,A morphological processor achieves detection and image enhance-ment. A correlator achieves recognition(and can also achieve detection and identi-fication). A feature extractor is useful for identification in large class problemsin scene analys *** optical processors can be realized on the same programmableoptical processor.

关键词： Optical processors image processors Optical correlators Target recognition Computer vision.

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