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Simulator, workstation, and data fusion components for onboard/offboard multi-target multi-sensor fusion

Simulator, workstation, and data fusion components for onboa...

引用

conference on Digital Avionics Systems (DASC)

作者： A.M. Pawlowski P.M. Gerken Lockheed Martin Advanced Technology Laboratories Camden NJ USA

The Lockheed Martin Advanced technology Laboratories (ATL), participating in the Army's largest Advanced technology Demonstration, has developed a real-time, onboard/offboard multi-sensor, multi-target data fusion system that operates on 14 different sources of information. As the data fusion software developer, ATL created two additional software products in order to effectively design, build, measure, and demonstrate the capabilities of the embeddable information fusion system. A user-friendly, graphical data fusion input simulator (DFIS) was required to facilitate building multi-target, multi-sensor scenarios for fusion stimulation. In addition, since the embedded fusion system has no graphical output, a data fusion workstation (DFWS) was needed to display metrics and output data within each algorithmic step of the fusion process and to provide a fusion demonstration facility. The data Fusion Input Simulator replicates the performance of 14 onboard and offboard data sources to provide tracks, contact reports, group tracks, and line-of-bearing data.

关键词： Workstations radar tracking sensor fusion Object oriented modeling sensor systems Laboratories Real time systems Missiles Information resources Embedded software

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High performance analog-to-digital converter technology for military avionics applications

High performance analog-to-digital converter technology for ...

引用

IEEE conference on Aerospace

作者： E.J. Martinez R.L. Bobb Electron Devices Division WU AADD Air Force Research Laboratory OH USA

The signal processing requirements of military avionics systems are constantly increasing to meet the threats of the next century. This is especially true as the digital interface moves closer to the sensor/antenna and the analog-to-digital converter (ADC) performance requirements become a major contributor to spaceborne data and signal/sensor processors and mission management specifications. The benefits of moving the digital interface closer to the sensor/antenna in avionics systems can be classified in four different categories: affordability, reliability and maintainability, physical, and performance. This reduction in RF downconversion stages as the digital interface migrates toward the sensor can result in some difficult ADC requirements that can not currently be met by commercial technologies. It is the intention of this presentation to expose the aerospace community to these emerging requirements for radar, communication and navigation (CNI), and electronic warfare missions. In addition to these requirements, we are presenting some examples of current state-of-the-art ADCs, their technology limitations, and briefly discuss potential applications in avionics systems. We have also included in this presentation a brief discussion on the fundamental and physical limitations that impair the progress of current and future ADC technologies. This presentation will conclude with a technology forecast, and an estimate on ADC availability for future avionics systems.

关键词： Analog-digital conversion Aerospace electronics Signal processing Spaceborne radar Space technology sensor systems Maintenance Radio frequency Navigation Electronic warfare

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radar selected plot processing system

Radar selected plot processing system

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International conference on Microwaves, radar and Wireless Communications

作者： B. Istvan Institute of Military Technology Budapest Hungary

Development of new air sovereignty control system-which is basically the ASOC (Air Sovereignty Operations Center) of Hungary suitable for the present and future is under preparation. This system has extremely high cost of production therefore, not only to prepare it technically, but owing to the fact that existing radar has to be modernized and prepared for connecting to the planned new air sovereignty control system. During preparation time we must pay attention to the following facts: (a) the single reconnaissance sensors have to be integrated into reconnaissance system and in addition the air surveillance has high priority; (b) information of sensors (radar) would have to get through to users within the possible shortest time (within a few seconds); (c) there is great civilian air traffic in peace-time-in case of military threats cooperation between the military and civilian air traffic control has great importance; (d) data of air surveillance has different types of radar we have to use, process in real time and spread information to users according to their requirements. This article is a brief overview of input radar signal processing equipment for the air sovereignty control system having importance especially in field of the radar plot extractors and data processing.

关键词： Control systems Reconnaissance sensor systems Surveillance Air traffic control radar signal processing Costs Production systems Joining processes Real time systems

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A novel technique for the blind estimation of a channel matrix

A novel technique for the blind estimation of a channel matr...

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IEEE International conference on Electronics, Circuits and Systems (ICECS)

作者： Zhongfu Ye P.C. Ching K.M. Wong Department of EEIS University of Science and Technology Hefei Anhui China Department of Electrical Engineering Chinese University of Hong Kong Sha Tin Hong Kong China

In this paper, a novel technique is presented for blindly estimating the channel matrix in an M-sensor K-source system. A special estimated higher-order cumulant matrix of the received data is first constructed. The channel matrix is then estimated by the eigendecomposition of the cumulant matrix. This method does not need any prior information of the signal. Computer simulation results are presented showing that the proposed algorithm is very promising.

关键词： Signal processing algorithms Parameter estimation Signal processing sensor arrays Array signal processing Sonar detection MIMO sensor systems Computer simulation radar detection

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Generalized forward/backward subaperture smoothing techniques for sample starved STAP

Generalized forward/backward subaperture smoothing technique...

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International conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： S.U. Pillai J.R. Guerci Y.L. Kim Department of Electrical Engineering Six MetroTech Center Polytechnic University Brooklyn NY USA SAIC Air Defense Technology Arlington VA USA

A major issue in space-time adaptive processing (STAP) for airborne moving target indicator (MTI) radar is the so-called sample support problem. Often, the available sample support for estimating the interference covariance matrix leads to severe rank deficiency, thereby precluding STAP beamforming based on the direct sample matrix inversion (SMI) method. The intrinsic interference subspace removal (ISR) technique, which is a computationally useful form of diagonally loaded SMI method, can handle this case, although the performance is poor in low sample situations. In this context, new subarray-subpulse schemes using forward and backward data vectors are introduced to overcome the data deficiency problem. It is shown that a multiplicative improvement in data samples can be obtained at the expense of negligible loss in space-time aperture of the steering vector.

关键词： Smoothing methods Clutter Covariance matrix Spaceborne radar sensor arrays Vectors Airborne radar Echo interference Space technology Array signal processing

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Surface penetrating radar image quality

Surface penetrating radar image quality

引用

1998 Second International conference on the Detection of Abandoned Land Mines (IEE Conf. Publ. No. 458)

作者： D.J. Daniels ERA Technology Limited UK

The detection of buried or surface laid mines by ultrawideband, ground-probing radar systems is currently receiving much attention. The radar signature of the mine may be known, in which case a range of techniques can be used to characterise the received signal. These range from, in the case of surface laid mines, characterisation of the sequence of reflections caused by external reflections, creeping waves and internal reflections such as the Glory wave; singularity expansion methods (SEM); resonance characterisation via such techniques as Prony; through to wavelet analysis. For buried mines the range of classification options is more limited as the host material significantly modifies the impulse response of the target, but shallow mines may still be identifiable. The extent of validation trials on most of these processing methods is limited. This paper considers some of the parameters, whereby the discrimination of the spatial signature of the mine is based solely on a statistical assessment of the radar image data and a characterisation of the radar sensor.

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Airborne Laser Surveying - Systems and Applications

Airborne Laser Surveying - Systems and Applications

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conference on Lasers and Electro-Optics Europe (CLEO EUROPE)

作者： R. Axelsson Saab Dynamics AB

Airborne Laser Surveying - Systems and Applications. The capability to position accurately geographic data in the horizontal plane has increased enormously by the access to satellite positioning systems (GPS). GPS combined with technology of Laser Range Finding, LRF respectively Laserbathymetri, LBS form versatile tools for accurate survey. Systems for the two applications are presented.

关键词： Laser theory Sea surface Laser beams sensor systems Laser radar Telephony Global Positioning System Sonar Safety Satellites

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Multistage cancellation of terrain scattered jamming and conventional clutter

Multistage cancellation of terrain scattered jamming and con...

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International conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： D.J. Rabideau Lincoln Laboratory Massachusetts Institute of Technology Lexington MA USA

This paper addresses the problem of adaptively cancelling both conventional clutter and terrain scattered jamming (TSJ) in airborne radar systems. Existing algorithms for this type of interference adapt first in space/fast-time to cancel the TSJ, then in space/slow-time to cancel the conventional clutter. Unfortunately, the rapid weight updating required to cancel the nonstationary TSJ will modulate the clutter and targets, making the cancellation of conventional clutter extremely difficult and reducing the accuracy of the reported target locations. This paper proposes a multistage beamformer that prevents modulated clutter from degrading cancellation performance. The processor is formulated and its properties are described. The application of this beamformer to site-specific simulated data sets is used to illustrate its performance.

关键词： Jamming Clutter radar scattering Matched filters Space technology Interference cancellation sensor arrays Delay Earth Laboratories

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DREAM: data fusion and human factors applied to vehicle mounted mine detection

DREAM: data fusion and human factors applied to vehicle moun...

引用

1998 Second International conference on the Detection of Abandoned Land Mines (IEE Conf. Publ. No. 458)

作者： M. Arnold M. Barron M. Fritzsche F. Nivelle THOMSON CSF Humman Factors UK Daimler-Benz AG Germany TME THOMSON CS France

Various sensor technologies are currently being investigated, and, although each solution offers interesting possibilities, it is already clear that no single technology can offer both high detection performance and the level of efficiency required. By associating several types of sensors and using data fusion techniques to cross-cue sensor data, both performance and efficiency can be improved. Such a multisensor system, mounted on a vehicle, will reduce the risk and the cost of demining operations. The latest development of such systems combine sensors. such as ground probing radar, metal detectors and infrared cameras. To be efficient, such high-technology tools have to take into account both the capabilities and experience of users. In order to generate a truly practical concept, the DREAM project has assigned human factors specialists, in close cooperation with sensors and data fusion designers, to manage the technology, to ensure it can be operated by people other than scientists, to ensure it will work in minefields as well as in the test lane and to ensure that errors and accidents are designed-out as much as is possible. This paper outlines the sensor fusion techniques, the human issues addressed, the concerns and problems identified, and indicates a way forward for the development of a practical multisensor vehicle which could be used effectively by non-governmental organisations and commercial concerns.

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Ground plane detection using visual and inertial data fusion

Ground plane detection using visual and inertial data fusion

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IEEE International conference on Electronics, Circuits and Systems (ICECS)

作者： J. Lobo J. Dias Institute of Systems and Robotics Electrical Engineering Department University of Coimbra Portugal

In mobile systems the position and attitude of the active vision system's cameras can be hard to determine. Inertial sensors coupled to the active vision system can provide valuable information, as happens with the vestibular system in human and other animals. In this article, we present our integrated inertial and vision systems. The active vision system has a set of stereo cameras capable of vergence, with a common baseline, pan and tilt, and an implemented process of visual fixation. An inertial system prototype, based on low-cost sensors, was built. The inertial sensor data is used to segment the ground plane in the images. For on-the-fly visualisation of the segmented images and the detected ground points a VRML viewer is used.

关键词： Machine vision Cameras sensor systems Image segmentation Position measurement Humans Animals Prototypes Image sensors visualization

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