Method for determining isochronous points on an aircraft route and method for selecting a reference point for an alternate landing

By obtaining the latitude, longitude, wind speed, and wind direction information of the alternate landing reference point, calculating the slope and intersection of isochrones, and directly determining the isochrone point, the problem of insufficient accuracy and complex calculation of isochrones in existing technologies is solved, enabling rapid and accurate determination in emergency situations.

CN116631230BActive Publication Date: 2026-06-09COMMERCIAL AIRCRAFT CORP OF CHINA LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
COMMERCIAL AIRCRAFT CORP OF CHINA LTD
Filing Date
2023-05-26
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing methods for determining isochronous points are not precise enough along aircraft routes and are computationally complex, making it impossible to quickly and accurately determine isochronous points in emergency situations.

Method used

By obtaining the latitude and longitude coordinates and real-time wind force and direction information of the alternate landing reference point, the slope and intersection of the isochrones are calculated, and the isochrones are directly determined by the intersection of the isochrones with the flight segment, simplifying the calculation process.

Benefits of technology

It improves the accuracy and calculation efficiency of isochronous points, enabling rapid and accurate determination of isochronous points in emergency situations, thus meeting the needs of safe aircraft operation.

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Abstract

The application discloses a method for determining isochronous points on an airplane route and a method for selecting a reserve landing reference point. The method comprises the following steps: obtaining the longitude and latitude coordinates of the starting point and the ending point of a to-be-flown flight section, and forming a flight section route represented by longitude and latitude coordinates based on the longitude and latitude coordinates; obtaining the longitude and latitude coordinates of a selected reserve first reference point and a reserve second reference point, and real-time wind force and wind direction information, and determining an isochronal line corresponding to the reserve first reference point and the reserve second reference point based on the longitude and latitude coordinates and the real-time wind force and wind direction information; and determining an isochronous point in each to-be-flown flight section contained in the airplane route based on the intersection of the isochronal line and the to-be-flown flight section. The method effectively solves the problem that the isochronous points determined by the existing method for determining isochronous points on an airplane route are not accurate enough, and the calculation process for determining the isochronous points is complex and cannot meet the requirement of quickly and accurately determining isochronous points in an emergency.
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