Showing papers on "Performance-based navigation published in 1978"
TL;DR: This paper covers management planning of implementation of the full system with a limited technical discussion of station operations, navigational science efforts leading to system validation/calibration, and engineering support functions to enhance reliability and maintainability.
Abstract: The Omega Navigation System was approved for full implementation in 1968 based on successful experimental VLF studies and actual low power station operations conducted in the early 1960's. Presently OMEGA has reached a point of progress where full system potentialities should be realized by 1982. The first permanent, high powered station started signal transmissions at La Moure, North Dakota in 1972; seven permanent and one low power temporary station are now usable for navigation purposes. This paper covers management planning of implementation of the full system with a limited technical discussion of station operations, navigational science efforts leading to system validation/calibration, and engineering support functions to enhance reliability and maintainability. Some of the highlights to be discussed are: Implementation of OMEGA--Australia; Transfer of synchronization responsibilities to the Japanese Maritime Safety Agency (JMSA); Worldwide monitor program and system calibration/validation; Navigational science investigations; User documentation manuals and correction tables; Signal format optimization; Field strength measurements; Station off-air time schedule for maintenance; U.S. Navy to U.S. Coast Guard system transition.
9 citations
TL;DR: The role of radio navigation and communications equipment for Space Shuttle navigation and communication equipment is discussed in terms of their ability to support Space Shuttle flight operations.
Abstract: This paper discusses the role of radio navigation and communications equipment for Space Shuttle navigation. Radio navigation systems are discussed in terms of their ability to support Space Shuttle flight operations. A phased development of navigation capability from conventional trackers to relay satellites and navigation satellites is reviewed.
5 citations
1 Mar 1978
TL;DR: The conclusion is reached that a GPS-Doppler navigation system can more easily attain the cost and performance goals and might be very attractive if it could be used for providing attitude and heading reference data as well as navigation data.
Abstract: : This report is presented in two parts. Part 1 presents the results of a feasibility study of a low-cost integrated GPS-inertial (strapdown) navigation system for Army attack helicopters. The conclusion is reached that a GPS-Doppler navigation system can more easily attain the cost and performance goals. It was also concluded that an integrated GPS-Doppler-inertial system might be very attractive if it could be used for providing attitude and heading reference data as well as navigation data. There would be a cost savings association with avoiding the need for the usual attitude and heading reference systems. Moreover, the integrated GPS-Doppler-inertial system would have excellent performance in the presence of aircraft dynamics and jamming. Part 2 presents the results of a study of advanced GPS signal processing techniques. Covered in the study are data aiding, comparison of phase-locked loops with Costas loops, variable predetection bandwidths in code-tracking loops, code loop dithering, aided tracking, variable tracking bandwidths, and effective gains of detectors in the presence of noise. The results are from computer simulation and theoretical analysis. (Author)
3 citations
1 Jan 1978
TL;DR: In this paper, the authors examined the FAA's certification of navigation systems to meet current requirements and those associated with building the data base needed to define future system improvements, and the interrelationships between the near and far term programs are discussed.
Abstract: The FAA navigation program, which includes two major activity areas: those associated with certification of navigation systems to meet current requirements and those associated with building the data base needed to define future system improvements is examined. The near term activities, including the VORTAC upgrading program, the development of the technical data base needed for certification of LORAN C and OMEGA as a part of the current air navigation system, and the development of area navigation standards are examined in regard to cost factors and user requirements. Future system activities discussed include analysis of alternative system configurations made up of system elements including VORTAC VOR-DME, OMEGA and differential OMEGA, LORAN C, and GPS. The interrelationships between the near and far term programs are discussed. A helicopter IFR program which includes an assessment of the operational suitability of several navigation system alternatives for meeting helicopter navigation requirements for CONUS and offshore operations is reported.
1 citations
1 Feb 1978
TL;DR: An OMEGA navigation receiver with a microprocessor as the computational component was investigated and an analytical evaluation on the basis of error probability of an algorithm for automatic time synchronization of the receiver to the OMEGA broadcast format was discussed.
Abstract: An OMEGA navigation receiver with a microprocessor as the computational component was investigated. A version of the INTEL 4004 microprocessor macroassembler suitable for use on the CDC-6600 system and development of a FORTRAN IV simulator program for the microprocessor was developed. Supporting studies included development and evaluation of navigation algorithms to generate relative position information from OMEGA VLF phase measurements. Simulation studies were used to evaluate assumptions made in developing a navigation equation in OMEGA Line of Position (LOP) coordinates. Included in the navigation algorithms was a procedure for calculating a position in latitude/longitude given an OMEGA LOP fix. Implementation of a digital phase locked loop (DPLL) was evaluated on the basic of phase response characteristics over a range of input phase variations. Included also is an analytical evaluation on the basis of error probability of an algorithm for automatic time synchronization of the receiver to the OMEGA broadcast format. The use of actual OMEGA phase data and published propagation prediction corrections to determine phase velocity estimates was discussed.
1 citations