Method for generating warning envelope curve of helicopter terrain awareness and warning system

Abstract

The invention discloses a method for generating a warning envelope curve of a helicopter terrain awareness and warning system (HTAWS). The method comprises the following steps of: 1, constructing a normal trace model under the condition that a helicopter is not warned, constructing a helicopter warned circumvention trace model according to pilot circumvention operation, respectively comparing the two trace models with one-order Markov random terrain data, and judging whether the flight strategy succeeds in warning; 2, performing a large amount of flight simulation, counting a false warning rate and a warning success rate which serve as the performance indexes of the warning system, generating a system operating characteristic (SOC) curve, and selecting the optimal warning threshold value point by considering the influence of the two indexes on the system; and 3, generating the whole warning threshold value envelope curve. The invention aims to provide a warning envelope curve generation method for an HTAWS mode 1 and an HTAWS mode 2 based on a system performance (SOC) curve by considering the influence of false warning and leak warning on the warning system; the finally generated warning threshold value envelope curve is relatively rational; and the probability of false warning and leak warning can be effectively reduced.

Description

technical field [0001] The invention relates to a method used in the technical field of threshold value selection, in particular to a method for generating an envelope of a helicopter terrain perception and warning system based on a system performance curve. Background technique [0002] Controlled Flight into Terrain (CFIT) incidents are one of the main causes of airframe damage and fatalities. The civil helicopter terrain awareness and warning system (Helicopter Terrain Awareness and Warning System, HTAWS) can give an early warning based on the current state of the aircraft and the terrain ahead, effectively avoiding controlled flight hitting the terrain and ensuring flight safety. The system mainly includes six traditional warning modes and forward-looking warning mode, which can be based on excessive descent speed, terrain approach rate, excessive lowering of flight altitude after take-off or go-around procedures, insufficient headroom, low glideslope during landing and ...

AI Technical Summary

Problems solved by technology

False alarms and missed alarms will affect the performance of the alarm system

Although setting a large alarm threshold can provide enough time for the operator to take remedial measures and effectively reduce the occurrence of missed alarms, but there are too many uncertainties in the predicted trajectory, and the possibility of false alarms also increases accordingly; , if the alarm threshold is set small, the predicted trajectory is relatively accurate, which can reduce the occurrence of false alarms, and also increase the probability of accidents due to untimely alarms

In recent years, helicopter terrain perception and warning system products produced abroad have been introduced to the market one after another, but in terms of warning performance, each product still has a lot of room for improvement

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