A method of obtaining navigation altitude by fusing relative altitude and absolute altitude

A technology of relative altitude and absolute altitude, which is applied in the direction of altitude or depth control, and can solve the problems of navigation altitude value jump, flight accidents, and different altitude values.
CN104049636BActive Publication Date: 2017-01-25BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
BEIHANG UNIV
Publication Date
2017-01-25

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Abstract

A navigation altitude obtaining method combining relative altitude and absolute altitude comprises the five steps of obtaining the relative altitude hrelat of an aircraft from the ground with a relative altitude measurement meter, obtaining the absolute altitude habs of the aircraft with an absolute altitude measurement meter, determining the navigation altitude source according to the relative altitude hrelat, calculating the navigation altitude hNavi by means of the absolute altitude habs if it is determined that the navigation altitude source is the absolute altitude habs in the third step, and calculating the navigation altitude hNavi by means of the relative altitude hrelat and the ground altitude hground and calculating and recording the difference value hoffset between the navigation altitude hNavi and the absolute altitude habs if it is determined that the navigation altitude source is the relative altitude hrelat in the third step. According to the navigation altitude obtaining method combining relative altitude and absolute altitude, the reliability and accuracy of the navigation altitude are improved; when the aircraft flies near the ground, the aircraft flies along with the ascending terrain, the aircraft can exit from the current state and return to an expected altitude when the aircraft flies along with the descending terrain, and then flight safety is guaranteed.
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Description

technical field

[0001] The present invention relates to a method for obtaining navigation altitude by fusing relative altitude and absolute altitude. Aircraft navigation control technology field. Background technique

[0002] The method for obtaining the flying height of the unmanned aerial vehicle includes using an absolute altimeter to obtain an absolute height, and using a relative altimeter to obtain a relative height. Absolute altimeters include GPS (Global Positioning System) positioning system, barometric altimeter and other instruments; relative altimeters include ultrasonic altimeters, laser altimeters, radio altimeters and other instruments.

[0003] The absolute altimeter has a large measurement range and can be used within the entire ceiling of the aircraft. However, when it is close to the ground, it is easily affected by factors such as surrounding buildings, trees, and weather changes, which will reduce the measurement accuracy or even fail. Therefore, using...

Claims

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