One aspect of system performance assessment of an Over-The-Horizon-radar (OTHR) requires a meaningful comparison of radar tracking data (geographic, kinematic, etc) against external ground-truth data measuring these s...
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One aspect of system performance assessment of an Over-The-Horizon-radar (OTHR) requires a meaningful comparison of radar tracking data (geographic, kinematic, etc) against external ground-truth data measuring these same quantities. These external data may originate from multiple sources each exhibiting unique characteristics even though they may describe a common target. To perform a comparison, the ground-truth data must be associated with the corresponding radardata. In general, the amount of data generated by these systems precludes a manual association of truth and radardata;an automated method is required. This paper successfully demonstrates the application of an artificial intelligence technique employing fuzzy logic to this problem, using real tracking data obtained from Australia's Jindalee OTHR.
The need to understand the statistical and spectral characteristics of synthetic aperture radar (SAR) data prompted the analysis of ADTS SAR data. The analysis included statistical and spectral analyses, with an empha...
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ISBN:
(纸本)0819415340
The need to understand the statistical and spectral characteristics of synthetic aperture radar (SAR) data prompted the analysis of ADTS SAR data. The analysis included statistical and spectral analyses, with an emphasis on understanding the impact of the SAR processing on the scene properties. Several models were developed, including a SAR Processing model and a scene generating model which explicitly models the scene speckle. As a result, a documented and tested FORTRAN program is available for spectral analysis. The statistical and spectral characteristics form the basis of ongoing SAR modeling.
A cockpit revolution is in the making. Many of the much ballyhooed, much promised, but little delivered technologies of the 70's and 80's will finally come of age in the 90's just in time to complement the...
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A cockpit revolution is in the making. Many of the much ballyhooed, much promised, but little delivered technologies of the 70's and 80's will finally come of age in the 90's just in time to complement the data explosion coming from sensor and processing advances. Technologies such as helmet systems, large flat panel displays, speech recognition, color graphics, decision aiding and stereopsis, are simultaneously reaching technology maturities that promise big payoffs for the third generation cockpit and beyond. The first generation cockpit used round dials to help the pilot keep the airplane flying right side up. The second generation cockpits used Multifunction Displays and the HUD to interface the pilot with sensors and weapons. What might the third generation cockpit look like? How might it integrate many of these technologies to simplify the pilot's life and most of all: what is the payoff?. This paper will examine tactical cockpit problems, the technologies needed to solve them and recommend three generations of solutions.
The radarSAT mission utilizes a Synthetic Aperture radar (SAR) system to produce images representing terrain radiometric backscatter levels. The SAR system consists of Space and Ground Segments. The Space Segment is a...
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One of the most important aspects in the navigation of ALV is computer vision or machine vision. Usually, it is achieved by using multisensor fusion technology. As we know, laser radar is a typical sensor in this proj...
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ISBN:
(纸本)0819415952
One of the most important aspects in the navigation of ALV is computer vision or machine vision. Usually, it is achieved by using multisensor fusion technology. As we know, laser radar is a typical sensor in this project, especially in the situation that there is an obstacle in a road. It is often effective to describe the relationship between road and obstacle by using height matrix from range data. However, when the front view is more complicated, such as a wall or a building on which exists a hole or a corridor big enough for ALV to go through, the above method may not be well done. For this reason, we propose a novel approach by using two matrixes from the range data to solve the problem. The main idea is that from the range data we figure out two matrixes, one is the height matrix, representing the height of the object from the horizontal plane, the other is the depth matrix representing the depth of the object from the laser radar vertical plane. By using the information of both height and depth, we can understand the front environment more precise and better.
With the increased availability of coherent wideband radars, there has been a renewed interest in radar target recognition. A large bandwidth gives high resolution in range which means target recognition may be possib...
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In this paper we present a new maximum likelihood array signal processing algorithm that uses self-calibration and the Total Least Squares (TLS) technique for improved direction finding when the sensor (or antenna) po...
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ISBN:
(纸本)0780314395
In this paper we present a new maximum likelihood array signal processing algorithm that uses self-calibration and the Total Least Squares (TLS) technique for improved direction finding when the sensor (or antenna) positions are not known exactly. The TLS method is a generalized data fitting method that is appropriate for cases when the system model contains error or is not known. In order to apply TLS techniques to array signal processing, we propose Constrained-TLS (C-TLS) and show that the solution can be represented by combining the constraint and the Least Squares (LS) approach. The algorithm performs calibration and direction estimation iteratively using both TLS and C-TLS techniques.
This paper reviews LAAS's lidar system technology, modular mechanical, hardware, and software components, and the basic challenge of integrating this technology into the French Prochip Demonstrator. Among the othe...
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This paper reviews LAAS's lidar system technology, modular mechanical, hardware, and software components, and the basic challenge of integrating this technology into the French Prochip Demonstrator. Among the other salient features discussed in this paper are the humain interface, vehicle control, factory floor traffic control, navigation, and sensordata fusion.
The effectiveness of applying incoherent change detection to multipass SAR images and targets in foliage is affected by the operating radar frequency band. Incoherent change detection is achieved by taking the weighte...
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ISBN:
(纸本)0819415340
The effectiveness of applying incoherent change detection to multipass SAR images and targets in foliage is affected by the operating radar frequency band. Incoherent change detection is achieved by taking the weighted difference of the magnitude of two well registered passes of SAR imagery. Items which change between two passes, such as a target present in the first pass and not present in the second pass, will appear in the weighted difference image. With well-registered wideband SAR imagery, images can be divided into frequency bands and evaluated using incoherent change detection. An Environmental Research Institute of Michigan (ERIM) Rail SAR experiment provides such a data collection. The Rail SAR is characterized by polarimetric, wideband (400 MHz - 1.3 GHz), multipass (with and without targets), well-registered SAR images. The ERIM Rail SAR data is divided into a number of frequency bands which simulate the high- band Stanford Research Institute, International (SRI) ultra- wideband radar (UWBR) (350-550 MHz), the Loral miniature SAR (MSAR) (500-800 MHz), and the Naval Air Warfare Center (NAWC) P-3 upgraded UWBR (200-900 MHz) sensor. This paper shows how these sensors work on targets in foliage using incoherent change detection and provides an experimental measurement of upper-bound performance.
The enhanced tactical radar correlator (ETRAC) system is under development at Westinghouse Electric Corporation for the Army Space Program Office (ASPO). ETRAC is a real-time synthetic aperture radar (SAR) processing ...
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ISBN:
(纸本)0819415960
The enhanced tactical radar correlator (ETRAC) system is under development at Westinghouse Electric Corporation for the Army Space Program Office (ASPO). ETRAC is a real-time synthetic aperture radar (SAR) processing system that provides tactical IMINT to the corps commander. It features an open architecture comprised of ruggedized commercial-off-the-shelf (COTS), UNIX based workstations and processors. The architecture features the DoD common SAR processor (CSP), a multisensor computing platform to accommodate a variety of current and future imaging needs. ETRAC's principal functions include: (1) Mission planning and control -- ETRAC provides mission planning and control for the U-2R and ASARS-2 sensor, including capability for auto replanning, retasking, and immediate spot. (2) Image formation -- the image formation processor (IFP) provides the CPU intensive processing capability to produce real-time imagery for all ASARS imaging modes of operation. (3) Image exploitation -- two exploitation workstations are provided for first-phase image exploitation, manipulation, and annotation. Products include INTEL reports, annotated NITF SID imagery, high resolution hard copy prints and targeting data. ETRAC is transportable via two C-130 aircraft, with autonomous drive on/off capability for high mobility. Other autonomous capabilities include rapid setup/tear down, extended stand-alone support, internal environmental control units (ECUs) and power generation. ETRAC's mission is to provide the Army field commander with accurate, reliable, and timely imagery intelligence derived from collections made by the ASARS-2 sensor, located on-board the U-2R aircraft. To accomplish this mission, ETRAC receives video phase history (VPH) directly from the U-2R aircraft and converts it in real time into soft copy imagery for immediate exploitation and dissemination to the tactical users.
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