Showing papers on "Performance-based navigation published in 1977"
TL;DR: It is shown that the true cost effectiveness of a navigation system is a strong function of volumetric coverage, data content and application versatility, as well as the more frequently–used parameters of accuracy and signal reliability.
Abstract: This paper presents a comparison of the performance characteristics and limitations of the major radio navigation systems which are currently operational or under development. The comparative analysis concentrates on six critical operational parameters which are considered basic to both civil and military applications. These parameters are Volumetric Coverage, Signal Reliability, Accuracy, Data Content, Application Versatility and User Equipment Cost. The ground–based systems analyzed are VORTAC, Loran–C, Omega and Differential Omega. The air–based systems include airborne radar position fixing, Doppler Navigation and the Joint Tactical Information Distribution System (JTIDS) Relative Navigation (RELNAV) function. The satellite–based systems covered are the Navy Navigation Satellite System (NNSS) and the Global Positioning System (GPS). Each of these systems is described and examined on the basis of the six evaluation criteria and a composite system comparison is presented. It is shown that the true cost effectiveness of a navigation system is a strong function of volumetric coverage, data content and application versatility, as well as the more frequently–used parameters of accuracy and signal reliability. The high degree of development maturity of some of the ground–based systems have led to very–low–cost user equipment and this will result in their continued use. The time–synchronous systems, i.e., GPS and JTIDS RELNAV, have unique performance and versatility advantages and these powerful systems will be used widely during the next decades, provided user equipment cost is reduced to acceptable levels. In order to increase over–all cost effectiveness, it is suggested that these latter systems be interconnected so as to take advantage of certain mutually beneficial characteristics.
8 citations
1 Oct 1977
TL;DR: In this paper, a brief survey of radio navigation aids, including satellite navigation, is presented, along with a more detailed review of the TRANSIT and NAVSTAR systems, thus encompassing the principal developmental and operational satellite navigation systems.
Abstract: This paper inciudes a brief survey of the generic types of radio navigation aids, including satellite navigation; then a more detailed review of the TRANSIT and NAVSTAR systems, thus encompassing the principal developmental and operational satellite navigation systems. The precision and accuracy of these systems, their basic operating characteristics, and the ancillary equipment required for their operations will be covered. The technical problems associated with performance, reliability and cost will be described.
2 citations
1 Mar 1977
TL;DR: A digital avionics system referred to as STOLAND was test flown in the NASA CV-340 aircraft to obtain performance data for time controlled guidance in the manual flight director mode.
Abstract: A digital avionics system referred to as STOLAND was test flown in the NASA CV-340 aircraft to obtain performance data for time controlled guidance in the manual flight director mode. The advanced system components installed in the cockpit included an electronic attitude director indicator and an electronic multifunction display. Navigation guidance and control computations were performed on a digital computer. A detailed 4D area navigation systems description is given. The pilot/system interface and systems operation and performance are also described. Approach flightpaths were flown which included a 180 deg turn and a 1-min, 5 deg straight-in approach to 30 m altitude, at which point go-around was initiated. Results are presented for 19 approaches.
2 citations
Proceedings Article•
1 Jan 1977
TL;DR: In this paper, position error sensitivity to sensor errors and flight path geometry is analyzed during RNAV/MLS transition using a digital computer simulation, which provides information necessary to establish requirements for additional guidance law design and establish airspace requirements for maneuvering to null out any residual RNAV errors upon MLS transition.
Abstract: Aircraft position error sensitivity to sensor errors and flight path geometry is analyzed during RNAV/MLS transition using a digital computer simulation. The avionics sensitivity data provides information necessary to establish requirements for additional guidance law design and to establish airspace requirements for maneuvering to null out any residual RNAV errors upon MLS transition. The data base is also beneficial as planning information for subsequent flight testing. The parameters varied during the generation of the data base include flight profile, error source content and magnitude, ground facility location, runway/flight path orientation and navigation mode. The avionics, autopilots and aircraft dynamics correspond to the existing NASA Terminal Configured Vehicle. Significant transients were observed during MLS transition, primarily in the vertical channel. These transients have a significant impact on airspace requirements and operational procedures in the RNAV/MLS environment.
1 citations
Journal Article•
TL;DR: The most sophisticated NVAV systems in existence today are the ones which can utilize either latitude and longitude or bearing and distance from the station as inputs for navigation as mentioned in this paper, which can be placed in the cockpit in a manner such that its application can be automated to a high degree.
Abstract: The most sophisticated NVAV systems in existence today are the ones which can utilize either latitude and longitude or bearing and distance from the station as inputs for navigation. These Automated Airborne Navigation Systems offer a means of placing some information in the cockpit in a manner such that its application can be automated to a high degree. The heart of the system for the pilot is the Control Display Unit, or CDU, with a complete alpha/numeric keyboard. Contained within the Automated Navigation System is a Flight Data Storage Unit, or FDSU, which contains all the navigational data in computer language on a magnetic tape or disc.
1 citations
1 Jan 1977
TL;DR: The final report on the Self-Contained High Altitude Navigation System (SCHANS) study as discussed by the authors provides a summary of the system concept, operation, performance and configuration as well as a statement of application potential, conclusions, and recommendations.
Abstract: : This report is Volume II of the three-volume final report on the Self-Contained High Altitude Navigation System (SCHANS) study. Volume I provides a summary description of the system concept, operation, performance, and configuration as well as a statement of application potential, conclusions, and recommendations. This volume describes results of SCHANS contract work by task. Volume III contains circuit level electrical design description of the Interferometric Landmark Tracker (ILT) Receiver and the Pulse Conversion Unit (PCU); it also contains an operational software Computer Program Development Specification.