Modeling method for refraction error compensation in ground object detection
Daochun Yu, Zhen Chen
TL;DR
This paper introduces a model to correct refraction errors in detecting ground objects from aircraft, improving accuracy in elevation angle measurements.
Contribution
A novel refraction error compensation model is proposed for precise ground object detection from aircraft.
Findings
A stratified area model with a 100-meter interval is used to simulate atmospheric refractive index profiles.
Snell’s law is applied to calculate true elevation angles and correct refraction-induced errors.
The model improves aircraft elevation angle accuracy for ground object identification and positioning.
Abstract
The refraction error compensation model for ground object detection is established. Firstly, based on a 100-meter interval, the area between the aircraft and the ground objects is stratified, and the Hopfield model of the atmospheric refractive index is combined with the e-index model to achieve an accurate simulation of the atmospheric refractive index profile. Then, based on the information such as the line-of-sight direction, flight altitude, and observation wavelength of the ground object observation target by the aircraft, combined with Snell’s law, the distance from the projection of the aircraft on the Earth’s surface to the true position of the ground object is given, and the true elevation angle is derived. Finally, by calculating the difference between the apparent elevation angle and the true elevation angle of the aircraft, the elevation angle error model of the aircraft is…
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Taxonomy
TopicsRadio Wave Propagation Studies · Advanced Control and Stabilization in Aerospace Systems · Infrared Target Detection Methodologies