Showing papers on "Performance-based navigation published in 1990"
20 Mar 1990
TL;DR: It is pointed out that terrain referenced navigation techniques are now well established as effective position-fixing systems suitable for use in manned and unmanned vehicles and the need for careful consideration of database quality and registration when terrain aided systems are being designed.
Abstract: It is pointed out that terrain referenced navigation (TRN) techniques are now well established as effective position-fixing systems suitable for use in manned and unmanned vehicles. The SPARTAN TRN technique, which has been selected for the UK Tornado GR4 update, provides accurate navigation with rapid initial capture without recourse to an initialization mode. An overview of the SPARTAN technique is provided, and techniques for improving navigation performance over very flat terrain are described. The benefits of the terrain characteristic matching techniques are outlined, and a summary of integrated navigation system performance is given. Terrain-aided systems require appropriate reference databases. The availability of the data and its suitability are discussed. The need for careful consideration of database quality and registration when terrain aided systems are being designed is indicated. >
33 citations
Patent•
3 Dec 1990TL;DR: In this article, a method of using a method for navigating and updating of navigation for aircract under utilization of sensor image processing and reference store data, for purposes of automatic or assisted landing is disclosed.
Abstract: A method of using a method for navigating and updating of navigation for aircract under utilization of sensor image processing and reference store data, for purposes of automatic or assisted landing is disclosed.
21 citations
20 Mar 1990
TL;DR: The design and simulation of the integrated navigation algorithms of the C-29A automatic flight inspection system (AFIS) are presented and results indicate that the errors occurring in the runway referenced position estimates can be controlled quite well.
Abstract: The design and simulation of the integrated navigation algorithms of the C-29A automatic flight inspection system (AFIS) are presented. The automatic flight inspection design problem is one of determining the inspecting aircraft's position with respect to the threshold of the runway independently of the ILS (instrument landing system) beam being inspected. The C-29A design is a unique application of the integrated navigation concept, in which the aircraft position is computed by an aided inertial navigation solution where the primary aiding measurements are the aircraft position at the runway threshold and end, each occurring once per inspection pass. A UD-factorized Kalman filter estimates the navigation errors, and a modified Bryson-Frazier smoother improves these estimates to provide the best estimate of aircraft position for calibration of the ILS beam. Results indicate that the errors occurring in the runway referenced position estimates can be controlled quite well. Moreover, the limited measurements available are sufficient to calibrate some sensor errors. The key component to achieving a specified Accuracy is the PPS (precision position subsystem). >
9 citations