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VOR Calibration Services

Description: from Introduction: The National Bureau of Standards has designed, constructed, and evaluated a standard for the support of very-high-frequency omnidirectional range (VOR) air navigation aids. The standard consists of two instruments: (1) a digital waveform signal generator for the composite VOR audio waveform, and (2) a standard phasemeter based on time series analysis of this waveform. Experimental results, a statistical analysis of them, and the principal software listings are included.
Date: April 1985
Creator: Larsen, Neil T.; Vecchia, Dominic F. & Sugar, George R.
Partner: UNT Libraries Government Documents Department

The Development of Loran-C Navigation and Timing

Description: From Abstract: "This work traces the development of the Loran-C concept from its inception as a 100-kHz pulse hyperbolic navigation system to more recent times when it found a variety of applications to both timing and navigation."
Date: October 1972
Creator: Hefley, Gifford
Partner: UNT Libraries Government Documents Department

Aeronautic instruments. Section 6 : aerial navigation and navigating instruments

Description: This report outlines briefly the methods of aerial navigation which have been developed during the past few years, with a description of the different instruments used. Dead reckoning, the most universal method of aerial navigation, is first discussed. Then follows an outline of the principles of navigation by astronomical observation; a discussion of the practical use of natural horizons, such as sea, land, and cloud, in making extant observations; the use of artificial horizons, including the bubble, pendulum, and gyroscopic types. A description is given of the recent development of the radio direction finder and its application to navigation.
Date: 1923?~
Creator: Eaton, H. N.
Partner: UNT Libraries Government Documents Department

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 previous work as appears to be of value to the aerial navigator, comparing instruments and methods, indicating the best practice, and suggesting future developments. The various methods of determining position and their application and value are outlined, and a brief resume of the theory of the astronomical method is given. Observation instruments are described in detail. A complete discussion of the reduction of observations follows, including a rapid method of finding position from the altitudes of two stars. Maps and map cases are briefly considered. A bibliography of the subject is appended.
Date: 1925
Creator: Beij, K. Hilding
Partner: UNT Libraries Government Documents Department

The Installation and Correction of Compasses in Airplanes

Description: "The saving of time that results from flying across country on compass headings is beginning to be widely recognized. At the same time the general use of steel tube fuselages has made a knowledge of compass correction much more necessary than was the case when wooden fuselages were the rule. This paper has been prepared primarily for the benefit of the pilot who has never studied navigation and who does not desire to go into the subject more deeply than to be able to fly compass courses with confidence" (p. 1).
Date: August 1927
Creator: Schoeffel, M. F.
Partner: UNT Libraries Government Documents Department

Maps and Navigation Methods

Description: Different maps and scales are discussed with particular emphasis on their use in aviation. The author makes the observation that current navigation methods are slow and dangerous and should be replaced by scientific methods of navigation based on loxodromy and the use of the compass.
Date: March 1922
Creator: Duval, A.
Partner: UNT Libraries Government Documents Department

Model Study of Channel Improvement and Stabilization in the Pryors Island Reach of the Ohio River

Description: This technical memorandum constitutes a complete report on a model study of the Pryors Island reach of the Ohio River, made for the purpose of determining the most effective plan of regulating works for the further improvement and stabilization of the navigable channel.
Date: September 1, 1938
Creator: Waterways Experiment Station (U.S.)
Partner: UNT Libraries Government Documents Department

Model Study of Plans for Channel Improvement at Dogtooth Bend, Mississippi River, Folder 1

Description: This memorandum, constitutes a report on the results of experiments conducted at the U. S. Waterways Experiment Station on a small scale model of that reach of the Mississippi River near and including Dogtooth Bend (Mile 32.7 above to Mile 4.0 below Cairo).
Date: April 2, 1938
Creator: Waterways Experiment Station (U.S.)
Partner: UNT Libraries Government Documents Department

The effects of target and missile characteristics on theoretical minimum miss distance for a beam-rider guidance system in the presence of noise

Description: Report presenting a study to determine the relative importance of the factors that place an inherent limitation on the minimum obtainable miss distance for a beam-rider navigation system operating in the presence of glint noise and target evasive maneuver. The factors considered include missile natural frequencies and damping ratios, missile steady-state acceleration capabilities, target evasive maneuver characteristics, and angular scintillation noise characteristics.
Date: February 10, 1958
Creator: Stewart, Elwood C.; Druding, Frank & Nishiura, Togo
Partner: UNT Libraries Government Documents Department

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 speed of response, effect of Mach number on response, and effect of networks are provided.
Date: August 13, 1952
Creator: Abramovitz, Marvin
Partner: UNT Libraries Government Documents Department

Obstacle detection for autonomous navigation : an LDRD final report.

Description: This report summarizes the analytical and experimental efforts for the Laboratory Directed Research and Development (LDRD) project entitled 'Obstacle Detection for Autonomous Navigation'. The principal goal of this project was to develop a mathematical framework for obstacle detection. The framework provides a basis for solutions to many complex obstacle detection problems critical to successful autonomous navigation. Another goal of this project was to characterize sensing requirements in terms of physical characteristics of obstacles, vehicles, and terrain. For example, a specific vehicle traveling at a specific velocity over a specific terrain requires a sensor with a certain range of detection, resolution, field-of-view, and sufficient sensitivity to specific obstacle characteristics. In some cases, combinations of sensors were required to distinguish between different hazardous obstacles and benign terrain. In our framework, the problem was posed as a multidimensional, multiple-hypothesis, pattern recognition problem. Features were extracted from selected sensors that allow hazardous obstacles to be distinguished from benign terrain and other types of obstacles. Another unique thrust of this project was to characterize different terrain classes with respect to both positive (e.g., rocks, trees, fences) and negative (e.g., holes, ditches, drop-offs) obstacles. The density of various hazards per square kilometer was statistically quantified for different terrain categories (e.g., high desert, ponderosa forest, and prairie). This quantification reflects the scale, or size, and mobility of different types of vehicles. The tradeoffs between obstacle detection, position location, path planning, and vehicle mobility capabilities were also to be characterized.
Date: March 1, 2004
Creator: Padilla, Denise D.
Partner: UNT Libraries Government Documents Department

The Validation of Interactive Computer Simulation Programs for Predicting On-Task Competencies for Inertial Navigation System Equipment

Description: This study investigated the predictive value of time on-task and error scores on tests administered through Control Data Corporation PLATO interactive computer graphics simulation as predictors of errors and time on-task for inertial navigation system equipment operation. In addition, the correlation between simulated pass/fail error and time on-task scores, and subsequent pass/fail criteria using actual equipment was investigated.
Date: May 1983
Creator: Hageman, Dwight C. (Dwight Conrad)
Partner: UNT Libraries

Physical Hydraulic Models: Assessment of Predictive Capabilities; Report 1: Hydrodynamics of the Delaware River Estuary Model

Description: Partial abstract: The purpose of this study is to define the reliability with which results of tests conducted in a physical model of the Delaware River Estuary can be used to predict the effects of modifications to the estuary. The Delaware River model at the Waterways Experiment Station was used to conduct tests to predict the effects of the navigation channel enlargement between Philadelphia and Trenton, and the results of the tests are compared with subsequent prototype data to determine the accuracy of the model predictions.
Date: June 1975
Creator: Letter, Joseph V., Jr. & McAnally, William H., Jr.
Partner: UNT Libraries Government Documents Department

Clean Water Rule Comment Compendium

Description: A report by the Environmental Protection Agency in which the organization answers questions pertaining to the Clean Water Rule with a specific focus on implementation issues.
Date: unknown
Creator: United States. Environmental Protection Agency.
Partner: UNT Libraries Government Documents Department

Missouri River Navigation: Data on Commodity Shipments for Four States Served by the Missouri River and Two States Served by Both the Missouri and Mississippi Rivers

Description: Correspondence issued by the Government Accountability Office with an abstract that begins "The Missouri River reservoir system is a critical national resource that provides a variety of benefits, including navigation, flood control, irrigation, hydropower, municipal and industrial water supply, recreation, and fish and wildlife habitat. The U.S. Army Corps of Engineers (Corps) is responsible for operating the Missouri River system to serve these congressionally authorized purposes. Between 1933 and 1964, the Corps built six dams on the Missouri River to serve the water resource needs within the Missouri River basin. The resulting reservoirs form a series of lakes from Montana to the South Dakota-Nebraska border. The Corps manages the system of dams and reservoirs according to the water control plan presented in its Missouri River Mainstem Reservoir System Master Water Control Manual, which was first published in 1960 and most recently revised in 2006. The master manual provides water control criteria for the reservoir system for a spectrum of anticipated runoff conditions. Annual operating plans based on these criteria provide detailed reservoir regulation for each operating year. Four states, Iowa, Nebraska, Kansas, and Missouri, are adjacent to the Missouri River and are served by barge and other vessel traffic along the river. Two states, Iowa and Missouri, are served by navigation on both the Missouri River and the Mississippi River. Both private companies and the Corps have conducted navigation activities on the Missouri River to and/or from these states. Companies transport numerous commodities, such as fertilizer, which is shipped from a port of origin to a port of destination, or sand and gravel, which some companies mine from the river and then transport to a processing facility on shore. In addition, the Corps conducts river maintenance and habitat recovery projects, which require the shipment of waterway improvement material, such as ...
Date: January 15, 2009
Creator: United States. Government Accountability Office.
Partner: UNT Libraries Government Documents Department

Robust Planning for Autonomous Navigation of Mobile Robots in Unstructured, Dynamic Environments: An LDRD Final Report

Description: This report summarizes the analytical and experimental efforts for the Laboratory Directed Research and Development (LDRD) project entitled ''Robust Planning for Autonomous Navigation of Mobile Robots In Unstructured, Dynamic Environments (AutoNav)''. The project goal was to develop an algorithmic-driven, multi-spectral approach to point-to-point navigation characterized by: segmented on-board trajectory planning, self-contained operation without human support for mission duration, and the development of appropriate sensors and algorithms to navigate unattended. The project was partially successful in achieving gains in sensing, path planning, navigation, and guidance. One of three experimental platforms, the Minimalist Autonomous Testbed, used a repetitive sense-and-re-plan combination to demonstrate the majority of elements necessary for autonomous navigation. However, a critical goal for overall success in arbitrary terrain, that of developing a sensor that is able to distinguish true obstacles that need to be avoided as a function of vehicle scale, still needs substantial research to bring to fruition.
Date: August 1, 2002
Partner: UNT Libraries Government Documents Department

Spin-Tunnel Investigation of a 1/28-Scale Model of a Subsonic Attack Airplane

Description: An investigation has been made of a 1/28-scale model of the Grumman A-6A airplane in the Langley spin tunnel. The erect spin and recovery characteristics of the model were determined for the flight design gross weight loading and for a loading with full internal fuel and empty external wing fuel tanks. The effects of extending slats and deflecting flaps were investigated. Inverted-spin and recovery characteristics of the model were determined for the flight design gross weight loading. The size of the spin-recovery tail parachute necessary to insure satisfactory spin-recovery was determined, and the effect of firing wing-mounded rockets during spins was investigated.
Date: July 1964
Creator: Lee, Henry A. & Healy, Frederick M.
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 character and incident, and his profiles of persons, including three signers of the Texas Declaration of Independence, reflect years of acquaintance. The beauty of his writing ranks this among the best of the reminiscences that were written as the steamboat era was declining. “Bagur is an expert on the Red River in the nineteenth century, and it shows in this work. Informative and entertaining.” —Randolph B. "Mike" Campbell, author of Gone to Texas: A History of the Lone Star State “This will rank as a great assistance to researchers if anyone wants to attack history of the Red River again. Some of his in-depth research was fabulous.”—Skipper Steely, author of Red River Pioneers
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: April 2014
Creator: Bagur, Jacques D.
Partner: UNT Press

Marine and Hydrokinetic Renewable Energy Devices, Potential Navigational Hazards and Mitigation Measures

Description: On April 15, 2008, the Department of Energy (DOE) issued a Funding Opportunity Announcement for Advanced Water Power Projects which included a Topic Area for Marine and Hydrokinetic Renewable Energy Market Acceleration Projects. Within this Topic Area, DOE identified potential navigational impacts of marine and hydrokinetic renewable energy technologies and measures to prevent adverse impacts on navigation as a sub-topic area. DOE defines marine and hydrokinetic technologies as those capable of utilizing one or more of the following resource categories for energy generation: ocean waves; tides or ocean currents; free flowing water in rivers or streams; and energy generation from the differentials in ocean temperature. PCCI was awarded Cooperative Agreement DE-FC36-08GO18177 from the DOE to identify the potential navigational impacts and mitigation measures for marine hydrokinetic technologies. A technical report addressing our findings is available on this Science and Technology Information site under the Product Title, "Marine and Hydrokinetic Renewable Energy Technologies: Potential Navigational Impacts and Mitigation Measures". This product is a brochure, primarily for project developers, that summarizes important issues in that more comprehensive report, identifies locations where that report can be downloaded, and identifies points of contact for more information.
Date: December 1, 2009
Creator: Cool, Richard, M.; Hudon, Thomas, J.; Basco, David, R. & Rondorf, Neil, E.
Partner: UNT Libraries Government Documents Department

Global positioning system pseudolite-based relative navigation.

Description: Though the Global Positioning System has revolutionized navigation in the modern age, it is limited in its capability for some applications because an unobstructed line of sight to a minimum of four satellites is required. One way of augmenting the system in small areas is by employing pseudolites to broadcast additional signals that can be used to improve the user's position solution. At the Navigation Systems Testing Laboratory (NSTL) at NASA's Johnson Space Center in Houston, TX, research has been underway on the use of pseudolites to perform precision relative navigation. Based on the findings of previous research done at the NSTL, the method used to process the pseudolite measurements is an extended Kalman filter of the double differenced carrier phase measurements. By employing simulations of the system, as well as processing previously collected data in a real time manner, sub-meter tracking of a moving receiver with carrier phase measurements in the extended Kalman filter appears to be possible.
Date: March 2004
Creator: Monda, Eric W.
Partner: UNT Libraries Government Documents Department