Helicopter ground proximity warning method

Abstract

The invention provides a helicopter ground proximity warning method. The method comprises steps: descent rate excessive large warning, terrain proximity rate excessive large warning, after-takeoff or go-around height descent excessive large warning, unsafe obstacle clearance height warning and glide slope offset excessive large warning are designed; as for each warning mode, main performance indexes related to helicopter ground proximity warning are obtained through a helicopter performance analysis program based on basic design parameters and performance parameters of the helicopter model; a plurality of design points are selected in a warning range limited by a reference point, and a warning boundary value of each design point is calculated respectively; the reference point in the warning boundary, the design points in the warning range limited by the warning boundary reference point and the warning boundary value of each design point are subjected to curve fitting to obtain a complete GPWS warning boundary curve, and the above warning boundary obtained through curve fitting is further simplified and cut to finally obtain a practical GPWS warning boundary based on a helicopter escape trajectory.

Description

technical field [0001] The invention relates to a helicopter technology, in particular to a method for realizing the terrain collision avoidance warning of the helicopter flying at low altitude under complicated weather conditions. Background technique [0002] In aviation flight, the situation of crash due to lack of awareness of the terrain around the aircraft is called controlled flight into terrain (controlled flight into terrain, CFIT). Controlled flight into terrain has always been a modern commercial aviation accident. one of the main reasons. For this reason, the industry researched and invented the ground proximity warning system (GPWS) to reduce CFIT accidents. After promotion by the Federal Aviation Administration (FAA) and the International Civil Aviation Organization, almost all commercial jet aircraft are equipped with GPWS. With the popularization and use, CFIT accidents have decreased significantly. [0003] Helicopters often fly in low-altitude areas with...

AI Technical Summary

Problems solved by technology

However, in order to consider the generality of the algorithm, its alarm boundary design is relatively conservative, and the alarm range is large, so it has the disadvantage of high false alarm rate.

For military helicopters with strong maneuverability, especially armed helicopters, the alarm range of this algorithm is too large, and the early warning time is too long, which will greatly limit the performance of the helicopter

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