This paper describes the design and preliminary test results of a 360-degree scanning, multispectral intrusion detection sensor. This moderate-resolution, panoramic imaging sensor is intended for exterior use at range...
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ISBN:
(纸本)0780345363
This paper describes the design and preliminary test results of a 360-degree scanning, multispectral intrusion detection sensor. This moderate-resolution, panoramic imaging sensor is intended for exterior use at ranges from 50 to 1500 meters. This Advanced Exterior sensor (AES) uses three sensing technologies (infrared, visible, and radar), separate track processors and sensor fusion to provide low false-alarm intrusion detection, tracking, and immediate visual assessment. The images from the infrared and visible detector sets and the radar range data are updated as the sensors rotate about once per second. The radar provides range data with one-meter resolution. This sensor has been designed for low-cost, easy use and rapid deployment to cover wide areas beyond, or in place of, typical perimeters, and tactical applications around fixed or temporary high-value assets. A prototype AES has been developed and preliminary test results are presented. This sensor represents a growing trend to use low-cost thermal imaging sensors, combined with other devices and advanced processing, for protection of U.S. military forces and other national assets.
This paper investigates modeling indoor environments using a low-cost, compact, active-range camera, known as BIRIS, mounted onto a pan and tilt motor unit. The BIRIS sensor, developed at the National Research Council...
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This paper investigates modeling indoor environments using a low-cost, compact, active-range camera, known as BIRIS, mounted onto a pan and tilt motor unit. The BIRIS sensor, developed at the National Research Council of Canada, is a rugged small camera with no moving parts. The objectives of this paper are to describe and demonstrate the viability of the use of a ion-cost range sensor in the domain of indoor environment modeling;to present the results of processing three-dimensional (3-D) data to build a virtual environment for navigation and visualization;and, to analyze and outline the advantages and limitations encountered when scanning large indoor environments.
Under a Phase II SBIR from NASA, a data collection radar was developed to support the NASA program in Automated-Nap-of-the-Earth (ANOE) guidance for helicopters. The developed radar is comprised of two parts, a sensor...
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Under a Phase II SBIR from NASA, a data collection radar was developed to support the NASA program in Automated-Nap-of-the-Earth (ANOE) guidance for helicopters. The developed radar is comprised of two parts, a sensor front end and a digital signal processor. The sensor front end is a wideband, linear FM, 94 Ghz millimeter wave radar with dual circular polarization and dual axis monopulse. It provides 10 dB Signal-to-Noise on a 5 m2 target at 1 Km. Digital signal processing is employed to provide range compression and monopulse angle beam sharpening. To remain within funding limitations the radar generates a reduced size raster scan of 12.5°×25°×320 m for collecting data. The range resolution is 3 m, the angle bin size is 0.34°, and there is frequency agility over 600 Mhz. data was collected from a ground location to verify operation of the radar. The data is displayed in a C-scope format using NASA supplied `Grid World' software.
This paper discusses the use of a 77GHz millimeter wave radar as a guidance sensor for autonomous land vehicle navigation. A test vehicle has been fitted out with a radar and encoders that give steer angle and velocit...
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ISBN:
(纸本)078034300X
This paper discusses the use of a 77GHz millimeter wave radar as a guidance sensor for autonomous land vehicle navigation. A test vehicle has been fitted out with a radar and encoders that give steer angle and velocity. An extended Kalman filter optimally fuses the radar range and bearing measurements with vehicle control signals to give estimated position and variance as the vehicle moves around a test site. The effectiveness of this data fusion is compared with encoders alone and with a satellite positioning system. Consecutive scans have been combined to give a radar image of the surrounding environment. data in this format will be invaluable for future work on collision detection and map building navigation.
An active video sensor system for determining target range and attitude was flown on STS-87. The Video Guidance sensor (VGS), developed at NASA's Marshall Space Flight Center (MSFC), demonstrated its capability in...
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ISBN:
(纸本)0819428299
An active video sensor system for determining target range and attitude was flown on STS-87. The Video Guidance sensor (VGS), developed at NASA's Marshall Space Flight Center (MSFC), demonstrated its capability in space and collected performance data. The VGS was designed to provide near-range sensordata as part of an automatic rendezvous and docking system. The sensor determines the relative positions and attitudes between the active sensor and the passive target. The VGS uses laser diodes to illuminate retro-reflectors in the target, a solid-state camera to detect the return from the target, and a frame grabber and digital signal processor to convert the video information into the relative positions and attitudes. The system is designed to operate with the target within a relative azimuth of +/- 9.5 degrees and a relative elevation of +/- 7.5 degrees. The system will acquire and track the target within the defined field-of-view between 1.5 meters and 110 meters range, and the VGS is designed to acquire at relative attitudes of +/- 10 degrees in pitch and yaw and at any roll angle. The sensor outputs the data at 5 Hz, and the target and sensor software and hardware have been designed to permit two independent sensors to operate simultaneously. This allows for redundant sensors. The data from the flight experiment includes raw video data from the VGS camera, relative position and attitude measurements from the VGS, solar angle data, and Remote Manipulator System (RMS) position data to correlate with the VGS data. The experiment was quite successful acid returned significant verification of the sensor's capabilities. The experience gained from the design and flight of this experiment will lead to improved video sensors in the future.
There is potentially a fundamental weakness in approaches where there is an implicit assumption that the environment and the method of measurement has little or no effect on the signature of the target. This is unlike...
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There is potentially a fundamental weakness in approaches where there is an implicit assumption that the environment and the method of measurement has little or no effect on the signature of the target. This is unlikely to be the case in reality because the target impulse response may vary to such an extent that such classification techniques may be inapplicable. 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 characterization of the radarsensor, are examined.
The goal of the Theater Acoustic Warfare/data Fusion (ThAW) project was to develop technology to create and maintain a reliable maritime picture of surface and subsurface targets for a Theater Command Center by fusing...
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The goal of the Theater Acoustic Warfare/data Fusion (ThAW) project was to develop technology to create and maintain a reliable maritime picture of surface and subsurface targets for a Theater Command Center by fusing multi-sensor surveillance contact and parametric data. sensor types included active and passive underwater acoustic, radar, and ESM/ELINT. The Deployable Autonomous Distributed Systems (DADS) Intra-Field data Fusion Project seeks to develop technology to control and fuse sensor information from a field of autonomous sensors in littoral waters. This paper will concentrate on the automated classification techniques developed for both the ThAW and DADS projects and the integration of the classification techniques with a multiple hypothesis correlator/tracker.
For sensor array, time/frequency and many other estimation problems, resolution increases with growing `aperture' or `data window.' High resolution with few sampling points can be achieved by using sparse or i...
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For sensor array, time/frequency and many other estimation problems, resolution increases with growing `aperture' or `data window.' High resolution with few sampling points can be achieved by using sparse or interferometric-like sampling schemes. In this paper we use a combination of the Cramer-Rao and Weiss-Weinstein bounds to define the region where unambiguous resolution is realized for such sampling schemes. Real data from a frequency-jump burst radar system is used to confirm the theoretical results.
Managing scientific data is a challenging task, and many of the problems it presents have yet to be adequately solved. The Real-time Environmental Information Network and Analysis System (REINAS) is an operational sol...
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Managing scientific data is a challenging task, and many of the problems it presents have yet to be adequately solved. The Real-time Environmental Information Network and Analysis System (REINAS) is an operational solution to the problem of collecting and distributing environmental data in a real-time context, as well as supporting data acquisition, retrieval, visualization and long-term data maintenance. The system is built around one or more databases and has been developed to support both real-time and retrospective regional scale environmental science. Continuous real-time data is acquired from dispersed sensors and input to a logically integrated but physically distributed system. The database engine provides a powerful structure to handle data management, but current database technology can have difficulty meeting the performance requirements that a large real-time environmental system demands. The REINAS architecture and current status is described in detail, including the challenges that were addressed in the construction of an operational system which includes a regional wireless instrumentation network comprised of over 200 instrument platforms and 1500 sensor streams producing real-time data of interest to thousands of users.
The HI-CLASS is a high power, wideband, coherent laser radar (ladar) for long range detection, tracking and imaging located at the Maul Space Surveillance Site. HI-CLASS will be used to provide high precision metrics ...
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ISBN:
(纸本)0819428299
The HI-CLASS is a high power, wideband, coherent laser radar (ladar) for long range detection, tracking and imaging located at the Maul Space Surveillance Site. HI-CLASS will be used to provide high precision metrics as well as information for images of space objects and remote sensing with the same system. The four phases of the HI-CLASS hardware development program were completed in Fall 1997. During this development contract, hardware and software were developed for two different modes of operation;a ladar mode for active imaging of satellites, and a lidar mode for remote sensing atmospheric measurements. Throughout the contract, data were collected which provided a demonstration of the system capabilities which validated technology and designs required for fielding operational systems. The HI-CLASS follow-on demonstration program is currently being performed under an Air Force contract. The follow-on demonstrations will provide the groundwork to an upgrade program currently under consideration by the Air Force. HI-CLASS provides high accuracy tracking in position and velocity simultaneously, and by ultimately providing size, shape and orientation information, it will help assess adversary capabilities. HI-CLASS has the potential to address operational areas of need for increased capability for information about space objects. The follow-on contract effort and the HI-CLASS upgrade effort will provide a demonstration of these potential applications of the HI-CLASS system.
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