Method for detecting autonomous landing parameters by using airborne radar equipment

By utilizing airborne Doppler navigation radar and radar altimeter to calculate descent speed and tilt angle, combined with the flight management system, the accuracy problem of manual visual autonomous landing was solved, achieving safety and precision in semi-automatic landing and reducing airport management costs.

CN121899799APending Publication Date: 2026-04-21SHANGHAI YUTAO INTELLIGENT TECH CO LTD +1
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Patent Information

Application Number
CN202410178685.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-02-11
Publication Date
2026-04-21

AI Technical Summary

Technical Problem

When relying on human visual inspection to achieve autonomous landing, existing technologies have failed to effectively utilize airborne radar equipment to provide accurate landing parameters, resulting in excessively high requirements for pilot skills and decision-making abilities. Furthermore, existing four-beam Doppler navigation radars contain errors in the frequency shift equation.

Method used

By utilizing airborne Doppler navigation radar and radar altimeter, and calculating descent speed, tilt angle, and descent distance, combined with flight management system and autopilot system, technical support is provided for semi-automatic landing. Errors in the Doppler frequency shift equation are corrected, and the derivation is performed using a dual coordinate system.

Benefits of technology

It reduces pilot stress, enhances landing performance, lowers airport management costs, and improves the accuracy and safety of autonomous landing.

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Abstract

In order to help pilots relying on manual visual inspection to realize autonomous landing more safely, the invention provides a method for assisting autonomous landing by using an airborne Doppler navigation radar and an airborne radar altimeter. Firstly, the glide speed can be obtained by directly utilizing the existing speed detection data of the airborne Doppler navigation radar. And secondly, calculating an inclination angle in a vertical plane by using detection data of Doppler frequency shift by a Doppler navigation radar, thereby obtaining a glide angle. Or the glide angle is calculated according to the trigonometric function relation by using the three-dimensional velocity component measured by the airborne Doppler navigation radar. And then on the basis of acquiring height measurement data by using an airborne radar altimeter, calculating a glide distance by using the acquired glide angle and a trigonometric function relationship. Furthermore, if the aircraft is further provided with a flight management system, an automatic driving system and the like, technical support can be provided for semi-automatic landing by using landing data provided by an airborne Doppler navigation radar and a radar altimeter.
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