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Theoretical Investigation of the Performance of Proportional Navigation Guidance Systems-Effect of Method of Positioning the Radar Antenna on the Speed of Response

Description: Memorandum presenting a linear theoretical analysis of the performance of three proportional navigation guidance systems installed in a given supersonic, variable-incidence, boost-glide, antiaircraft missile at Mach numbers of 2.7 and 1.3. It is shown that, with the antenna stabilized in space, the effect of component lags on the response is small, so that the speed of response is small, so that the speed of response can be made to approach closely that of the airframe alone.
Date: August 13, 1952
Creator: Abramovitz, Marvin
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Theoretical Investigation of the Performance of Proportional Navigation Guidance Systems: Effect of Method of Positioning the Radar Antenna on the Speed of Response

Description: Memorandum presenting a linear theoretical analysis made of the performance of three proportional navigation guidance systems installed in a given supersonic, variable-incidence, boost-glide, antiaircraft missile at Mach numbers of 2.7 and 1.3. Three guidance systems are compared on the basis of the maximum obtainable speed of response of the missile and guidance-system combination consistent with adequate stability. Results regarding the effect of method of positioning the radar antenna on the… more
Date: August 13, 1952
Creator: Abramovitz, Marvin
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Micro-system inertial sensing technology overview.

Description: The purpose of this report is to provide an overview of Micro-System technology as it applies to inertial sensing. Transduction methods are reviewed with capacitance and piezoresistive being the most often used in COTS Micro-electro-mechanical system (MEMS) inertial sensors. Optical transduction is the most recent transduction method having significant impact on improving sensor resolution. A few other methods are motioned which are in a R&D status to hopefully allow MEMS inertial sensors t… more
Date: February 1, 2009
Creator: Allen, James Joe
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Structural analysis in support of the waterborne transport of radioactive materials

Description: The safety of the transportation of radioactive materials by road and rail has been well studied and documented. However, the safety of waterborne transportation has received much less attention. Recent highly visible waterborne transportation campaigns have led to DOE and IAEA to focus attention on the safety of this transportation mode. In response, Sandia National Laboratories is conducting a program to establish a method to determine the safety of these shipments. As part of that program th… more
Date: August 1, 1996
Creator: Ammerman, D.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Autonomous, teleoperated, and shared control of robot systems

Description: This paper illustrates how different modes of operation such as bilateral teleoperation, autonomous control, and shared control can be described and implemented using combinations of modules in the SMART robot control architecture. Telerobotics modes are characterized by different ``grids`` of SMART icons, where each icon represents a portion of run-time code that implements a passive control law. By placing strict requirements on the module`s input-output behavior and using scattering theory t… more
Date: December 31, 1994
Creator: Anderson, R.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Building a modular robot control system using passivity and scattering theory

Description: This paper analyses the problems and presents solutions for building a modular robot control system. The approach requires modeling the entire robot system using multi-dimensional passive networks, breaking the system into subnetwork ``modules,`` and then discretizing the subnetworks, or n-ports, in a passivity preserving fashion. The main difficulty is the existence of ``algebraic loops`` in the discretized system. This problem is overcome by the use of scattering theory, whereby the inputs an… more
Date: March 1, 1996
Creator: Anderson, R.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A modular approach to multi-robot control

Description: The ability to rapidly command multi-robot behavior is crucial for the acceptance and effective utilization of multiple robot control. To achieve this, a modular- multiple robot control solution is being, pursued using the SMART modular control architecture. This paper investigates the development of a new dual-arm kinematics module (DUAL-KLN) which allows multiple robots, previously controlled as separate stand-alone systems, to be controlled as a coordinated multi-robot system. The DUAL-KIN m… more
Date: March 1, 1996
Creator: Anderson, Robert J. & Lilly, Kathryn W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Three-year summary report of biological monitoring at the Southwest Ocean dredged-material disposal site and additional locations off Grays Harbor, Washington, 1990--1992

Description: The Grays Harbor Navigation Improvement Project was initiated to improve navigation by widening and deepening the federal channel at Grays Harbor. Dredged-material disposal sites were selected after an extensive review process that included inter-agency agreements, biological surveys, other laboratory and field studies, and preparation of environmental impact statements The Southwest Site, was designated to receive materials dredged during annual maintenance dredging as well as the initial cons… more
Date: December 1, 1992
Creator: Antrim, L. D.; Shreffler, D. K.; Pearson, W. H. & Cullinan, V. I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Three-year summary report of biological monitoring at the Southwest Ocean dredged-material disposal site and additional locations off Grays Harbor, Washington, 1990--1992

Description: The Grays Harbor Navigation Improvement Project was initiated to improve navigation by widening and deepening the federal channel at Grays Harbor. Dredged-material disposal sites were selected after an extensive review process that included inter-agency agreements, biological surveys, other laboratory and field studies, and preparation of environmental impact statements The Southwest Site, was designated to receive materials dredged during annual maintenance dredging as well as the initial cons… more
Date: December 1, 1992
Creator: Antrim, L. D.; Shreffler, D. K.; Pearson, W. H. & Cullinan, V. I. (Battelle Marine Research Lab., Sequim, WA (United States))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department

[INS Interface and I-64 Unit Diagrams]

Description: Four diagrams detailing the Litton LTN-76 Inertial Navigation Systems (INS) interface and two diagrams detailing the I-64 Unit created by Applied Geophysics Inc. for a report summarizing tests performed with the LTN-76 designed to fly an airborne geophysical surveys.
Date: November 1981
Creator: Applied Geophysics, Inc.
Item Type: Refine your search to only Technical Drawing
Partner: UNT Libraries Government Documents Department
open access

IFSAR for the Rapid Terrain Visualization Demonstration

Description: The Rapid Terrain Visualization Advanced Concept Technology Demonstration (RTV-ACTD) is designed to demonstrate the technologies and infrastructure to meet the Army requirement for rapid generation of digital topographic data to support emerging crisis or contingencies. The primary sensor for this mission is an interferometric synthetic aperture radar (IFSAR) designed at Sandia National Laboratories. This paper will outline the design of the system and its performance, and show some recent flig… more
Date: October 31, 2000
Creator: BURNS,BRYAN L.; EICHEL,PAUL H.; HENSLEY JR.,WILLIAM H. & KIM,THEODORE J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department

Captain W.W. Withenbury's 1838-1842 Red River Reminiscences

Description: A selection of letters written to the Cincinnati Commercial newspaper from 1870-1871 about steamboat travel on the Red River in 1838-1841. W. W. Withenbury was a famous river boat captain during the mid-1800s. In retirement, he wrote a series of letters for the Cincinnati Commercial, under the title "Red River Reminiscences." Jacques Bagur has selected and annotated 39 letters describing three steamboat voyages on the upper Red River from 1838 to 1842. Withenbury was a master of charact… more
Access: Restricted to UNT Community Members. Login required if off-campus.
Date: April 2014
Creator: Bagur, Jacques D.
Item Type: Refine your search to only Book
Partner: UNT Press
open access

Image accuracy and representational enhancement through low-level, multi-sensor integration techniques

Description: Multi-Sensor Integration (MSI) is the combining of data and information from more than one source in order to generate a more reliable and consistent representation of the environment. The need for MSI derives largely from basic ambiguities inherent in our current sensor imaging technologies. These ambiguities exist as long as the mapping from reality to image is not 1-to-1. That is, if different 44 realities`` lead to identical images, a single image cannot reveal the particular reality which … more
Date: May 1, 1993
Creator: Baker, J. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Image accuracy and representational enhancement through low-level, multi-sensor integration techniques

Description: Multi-Sensor Integration (MSI) is the combining of data and information from more than one source in order to generate a more reliable and consistent representation of the environment. The need for MSI derives largely from basic ambiguities inherent in our current sensor imaging technologies. These ambiguities exist as long as the mapping from reality to image is not 1-to-1. That is, if different 44 realities'' lead to identical images, a single image cannot reveal the particular reality which … more
Date: May 1, 1993
Creator: Baker, J. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Terrain following of arbitrary surfaces using a high intensity LED proximity sensor

Description: Many robotic operations, e.g., mapping, scanning, feature following, etc., require accurate surface following of arbitrary targets. This paper presents a versatile surface following and mapping system designed to promote hardware, software and application independence, modular development, and upward expandability. These goals are met by: a full, a priori specification of the hardware and software interfaces; a modular system architecture; and a hierarchical surface-data analysis method, permit… more
Date: January 1, 1992
Creator: Baker, J. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Terrain following of arbitrary surfaces using a high intensity LED proximity sensor

Description: Many robotic operations, e.g., mapping, scanning, feature following, etc., require accurate surface following of arbitrary targets. This paper presents a versatile surface following and mapping system designed to promote hardware, software and application independence, modular development, and upward expandability. These goals are met by: a full, a priori specification of the hardware and software interfaces; a modular system architecture; and a hierarchical surface-data analysis method, permit… more
Date: January 1, 1992
Creator: Baker, J.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An efficient hybrid planner in changing environments

Description: In this paper, we present a new hybrid motion planner than is capable of exploiting previous planning episodes when confronted with new planning problems. Our approach is applicable when several (similar) problems are successively posed for the same static environment, or when the environment changes incrementally between planning episodes. At the heart of our system lie two low-level motion planners: a fast, but incomplete planner (which we call LOCAL), and a computationally costly (possibly r… more
Date: November 1, 1993
Creator: Barbehenn, M.; Hutchinson, S. & Chen, P. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Workload induced spatio-temporal distortions and safety of flight

Description: A theoretical analysis of the relationship between cognitive complexity and the perception of time and distance is presented and experimentally verified. Complex tasks produce high rates of mental representation which affect the subjective sense of duration and, through the subjective time scale, the percept of distance derived from dynamic visual cues (i.e., visual cues requiring rate integration). The analysis of the interrelationship of subjective time and subjective distance yields the pred… more
Date: January 1, 1989
Creator: Barrett, C. L.; Weisgerber, S. A. & Naval Weapons Center, China Lake, CA (USA))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Bayes-Maximum Entropy method for multi-sensor data fusion

Description: In this paper we introduce a Bayes-Maximum Entropy formalism for multi-sensor data fusion, and present an application of this methodology to the fusion of ultrasound and visual sensor data as acquired by a mobile robot. In our approach the principle of maximum entropy is applied to the construction of priors and likelihoods from the data. Distances between ultrasound and visual points of interest in a dual representation are used to define Gibbs likelihood distributions. Both one- and two-dimen… more
Date: January 1, 1991
Creator: Beckerman, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Astronomical Methods in Aerial Navigation

Description: The astronomical method of determining position is universally used in marine navigation and may also be of service in aerial navigation. The practical application of the method, however, must be modified and adapted to conform to the requirements of aviation. Much of this work of adaptation has already been accomplished, but being scattered through various technical journals in a number of languages, is not readily available. This report is for the purpose of collecting under one cover such pr… more
Date: 1925
Creator: Beij, K. Hilding
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Burlington Bottoms Wildlife Mitigation Site : Five-Year Habitat Management Plan, 2001-2005, 2000-2001 Progress Report.

Description: Historically the lower Columbia and Willamette River Basins were ecologically rich in both the habitat types and the species diversity they supported. This was due in part to the pattern of floods and periodic inundation of bottomlands that occurred, which was an important factor in creating and maintaining a complex system of wetland, meadow, and riparian habitats. This landscape has been greatly altered in the past 150 years, primarily due to human development and agricultural activities incl… more
Date: September 1, 2001
Creator: Beilke, Susan G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An Approach to Elemental Task Learning

Description: In this article we deal with the automated learning of tasks by a robotic system through observation of a human operator. Particularly, we explain what is meant by a learning ability in autonomous robots and in teleoperation systems, where several operators and several machines may work in cooperation to perform tasks. We discuss different approaches to learning in these systems and outline the features of the models they are based upon. This leads us to choose an analytical model suited for ta… more
Date: January 1, 1990
Creator: Belmans, P
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Overview of the DART project

Description: DART (DSP Arrary for Reconfigurable Tasks) is a parallel architecture of two high-performance SDP (digital signal processing) chips with the flexibility to handle a wide range of real-time applications. Each of the 32-bit floating-point DSP processes in DART is programmable in a high-level languate ( C'' or Ada). We have added extensions to the real-time operating system used by DART in order to support parallel processor. The combination of high-level language programmability, a real-time oper… more
Date: January 1, 1992
Creator: Berry, K. R.; Hansen, F. R.; Napolitano, L. M.; McKelvey, E. L.; Andaleon, D. D. & Leeper, J. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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