摘要:

AbstractEvaluation flightsof the Global Navigation Co. low cost, Digital Navigation System using existing Very Low Frequency (12kHz‐30kHz) Communication and Omega stations were initiated by the Western Region of FAA early in 1970. The developers of the system, Dr. Karl Frudenfeld and Mr. F. P. Wipff, felt that the system would have an impact on navigation in remote areas of the world as well as in the National Aviation System, and were desirous of appraising FAA of its development status at an early date.More than forty FAA managers and specialists have flown or observed the system in indoctrination flights varying from 10 to 400 miles in length and including many approaches under VFR conditions. Direct contact with personnel involved in company funded development and survey flights of this equipment over most of the North American continent has provided additional data and confidence in the system's capability.Continually refined systems have been installed in over twenty types of airplanes and helicopters to investigate a wide range of variables of configuration, atmospheric variables, geographical considerations and other known or suspected factors in a VLF navigation system. The results indicate an excellent capability for accurate point‐to‐point navigation for flights up to 800 nautical miles in length (or greater with waypoint updating) as well as a capability and potential for use in conducting approaches and specialized navigation and survey functions, as well as compatability with other navigation systems and techniques.A formal FAA funded flight evaluation program is now being conducted by the Western Region under the sponsorship of the System Research and Development Service. The results of this program should be available early in

ISSN:0028-1522    

DOI:10.1002/j.2161-4296.1972.tb01673.x

出版商:Blackwell Publishing Ltd    

年代:1972

数据来源: WILEY

摘要:

AbstractAn overviewof the Implementation Status of the Omega Navigation System with information on station construction programs and scheduled milestones is presented. The general descriptions of the stations and their new electronic equipments are discussed. Information is also provided on the program for Omega charts and navigational publications required to support the system expansion. Highlights of the concept of international participation and system management is included in this presentation.

ISSN:0028-1522    

DOI:10.1002/j.2161-4296.1972.tb01674.x

出版商:Blackwell Publishing Ltd    

年代:1972

数据来源: WILEY

摘要:

AbstractThis paper dealswith on‐going and planned Omega projects sponsored by the FAA Systems Research and Development Service. Existing Omega projects include a signal monitoring program in Canada, an airborne signal data collection project in cooperation with N.O.A.A., and an operational evaluation of the AN/ARN‐99 Omega System on a commercial airliner. Planned projects include evaluation of a differential Omega system, development of a 3.4khz or composite Omega airborne system, evaluations of low cost VLF/Omega equipment, and development of a civil aviation Omega system including the most promising techniques found in preceding investigati

ISSN:0028-1522    

DOI:10.1002/j.2161-4296.1972.tb01675.x

出版商:Blackwell Publishing Ltd    

年代:1972

数据来源: WILEY

摘要:

AbstractIn an attempt tosatisfy the need for a tactical aircraft command, control and positioning system, a number of systems have been tried. These candidate systems, including Loran and pulse radar, have provided less than desired performance primarily because of position accuracy. A C‐W (continuous wave) radar system patterned after the AN/USQ‐28 SHIRAN system shows promise for a more satisfactory solution to the prob

ISSN:0028-1522    

DOI:10.1002/j.2161-4296.1972.tb01676.x

出版商:Blackwell Publishing Ltd    

年代:1972

数据来源: WILEY

摘要:

AbstractThis paper providesdata to aid the user or prospective user of the Navy Navigation Satellite System to better understand what results can be expected from either a two‐minute doppler position fix program or a short doppler position fix program.Brief summaries of satellite theory and the mathematical and mechanizational differences between two minute and short doppler computations are presented. A description of a computer program capable of computing both two‐minute doppler and short doppler position fixes is given.Data is presented which has been computed using the actual real‐time computer program. Position fix results from the two different doppler methods, obtained from the same satellite passes, are shown. Conclusions are drawn from these results as to the inherent accuracies of the two methods and in what circumstances one method or the other is more advanta

ISSN:0028-1522    

DOI:10.1002/j.2161-4296.1972.tb01677.x

出版商:Blackwell Publishing Ltd    

年代:1972

数据来源: WILEY

ISSN:0028-1522    

DOI:10.1002/j.2161-4296.1972.tb01678.x

出版商:Blackwell Publishing Ltd    

年代:1972

数据来源: WILEY

摘要:

AbstractEvaluation testsof the DIFFERENTIAL OMEGA mode of electronic navigation associated with an original procedure for transmission and application of skywave corrections (SWC) by automatic means have recently been conducted at land‐based locations and on board ships at sea.The procedure under review, which is capable of an accuracy better than 1 centicycle (CEC) in the transmission of SWCs by a single station is quite simple and cheap up to a distance of 400 n.m. The system has been designed to permit up to eight such transmitters being included in one frequency range (total bandwidth 1.2. Khz). With the chain of transmitters thus constituted up to 5,000 km of ocean coast may be covered at little cost.Tests have been carried out using a SWC transmitter with a coverage of 400 n.m. and a mobile receiver unit comprised of a conventional OMEGA receiver, a differential OMEGA receiver, and a TORAN radiolocation receiver with a position location capability better than 50 meters for calibration purposes. All these were digitized instruments and their outputs were, in addition, simultaneously recorded on paper tape (analog presentation) and punched tape (teleprinter ASR 33).A comprehensive program was used to translate the data thus collected to geographical coordinates, and to compute errors in terms of OMEGA phase discrepancies, and also in terms of distance and azimuth with respect to the reference position given by TORAN readings.Recordings have been made ashore over distances of from 5 to 300 km, in addition to two experimental campaigns at sea. A total of over 10,000 measurement points have been logged over a 3 deg × 3 deg area having its center at 46 N × 3 W. Results have fully substantiated what was expected of the system in its present configurat

ISSN:0028-1522    

DOI:10.1002/j.2161-4296.1972.tb01679.x

出版商:Blackwell Publishing Ltd    

年代:1972

数据来源: WILEY

摘要:

AbstractIn two or three yearsOmega radionavigation will cover the world, providing an earth‐referenced fixing system accurate to about one nautical mile. Over the past three years Canadian Marconi have been designing a computerized airborne Omega receiver, and for over one year, in flight evaluation of the receiver. The receiver design approach is examined, and results of operating experience in Northern regions from Alaska to Norway are discussed and tabulated. Accuracy is shown to be time‐independent, approximately one mile, for 10.2 and 13.6 kHz in Canadian Arctic and European regi

ISSN:0028-1522    

DOI:10.1002/j.2161-4296.1972.tb01680.x

出版商:Blackwell Publishing Ltd    

年代:1972

数据来源: WILEY

摘要:

AbstractThe research flight facilityof the National Oceanic and Atmospheric Administration (NOAA) is engaged in flying in and around all types of weather phenomena. Since the summer of 1969 the RFF has had a Tracor 7007B Omega System installed on at least one of the RFF aircraft. Further, since August 1970, the Omega information has been digitized and recorded on the aircraft digital recording system. The National Hurricane Research Laboratory of NOAA has been evaluating the information collected. Due to the severe weather encountered in hurricanes, snow storms, and around thunderstorms, it has become apparent that certain adverse weather definitely affects the operation of airborne Omega. This paper will describe these effects utilizing both E‐ and H‐field antenn

ISSN:0028-1522    

DOI:10.1002/j.2161-4296.1972.tb01681.x

出版商:Blackwell Publishing Ltd    

年代:1972

数据来源: WILEY

摘要:

AbstractThe operational experienceand recent evaluation data pertaining to the performance of TALAR, a step scanned microwave landing system is reviewed. The data reviewed covers a period of approximately 10 years. The basic functional operation of a step scan system is described, i.e., TALAR. A family of landing systems is then derived via modular interchange with the base line unit. Operational configurations such as short take off and landing, asynchronous split site, multi angle and multi channel are described.

ISSN:0028-1522    

DOI:10.1002/j.2161-4296.1972.tb01682.x

出版商:Blackwell Publishing Ltd    

年代:1972

数据来源: WILEY