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Accurate Measurement Calculation Method for Interferometric Radar Altimeter-Based Terrain Referenced Navigation †

In order to improve the performance of Terrain Referenced Navigation (TRN), an Interferometric Radar Altimeter (IRA) has been developed as a more accurate altimeter. The IRA outputs not only the relative distance (slant range, R) but also the cross-track angle (look angle, θ) of the closest point on...

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Autores principales: Oh, Juhyun, Sung, Chang-Ky, Lee, Jungshin, Lee, Sang Woo, Lee, Sang Jeong, Yu, Myeong-Jong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6480591/
https://www.ncbi.nlm.nih.gov/pubmed/30970622
http://dx.doi.org/10.3390/s19071688
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author Oh, Juhyun
Sung, Chang-Ky
Lee, Jungshin
Lee, Sang Woo
Lee, Sang Jeong
Yu, Myeong-Jong
author_facet Oh, Juhyun
Sung, Chang-Ky
Lee, Jungshin
Lee, Sang Woo
Lee, Sang Jeong
Yu, Myeong-Jong
author_sort Oh, Juhyun
collection PubMed
description In order to improve the performance of Terrain Referenced Navigation (TRN), an Interferometric Radar Altimeter (IRA) has been developed as a more accurate altimeter. The IRA outputs not only the relative distance (slant range, R) but also the cross-track angle (look angle, θ) of the closest point on the zero Doppler line by using the principle of interferometry and two or more antennas. To perform TRN using the IRA, the 3D relative position of the closest point should be calculated. There is a formula to calculate the relative position of the closest point using the Euler angles. However, in an actual flight environment in which the influence of wind exists, the angle of attack, the side slip angle and “the effective look angle” should be used rather than the Euler angles. In this paper, a new formula for calculating the relative position of the closest point is proposed and mathematically derived. The proposed formula was verified with real data from actual flight. The flight test results show that the positions of the closest points calculated using the conventional method and the proposed method are different because of the wind effect. The TRN simulation results indicate that the proposed formula calculates the closest points more accurately than the conventional formula.
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spelling pubmed-64805912019-04-29 Accurate Measurement Calculation Method for Interferometric Radar Altimeter-Based Terrain Referenced Navigation † Oh, Juhyun Sung, Chang-Ky Lee, Jungshin Lee, Sang Woo Lee, Sang Jeong Yu, Myeong-Jong Sensors (Basel) Article In order to improve the performance of Terrain Referenced Navigation (TRN), an Interferometric Radar Altimeter (IRA) has been developed as a more accurate altimeter. The IRA outputs not only the relative distance (slant range, R) but also the cross-track angle (look angle, θ) of the closest point on the zero Doppler line by using the principle of interferometry and two or more antennas. To perform TRN using the IRA, the 3D relative position of the closest point should be calculated. There is a formula to calculate the relative position of the closest point using the Euler angles. However, in an actual flight environment in which the influence of wind exists, the angle of attack, the side slip angle and “the effective look angle” should be used rather than the Euler angles. In this paper, a new formula for calculating the relative position of the closest point is proposed and mathematically derived. The proposed formula was verified with real data from actual flight. The flight test results show that the positions of the closest points calculated using the conventional method and the proposed method are different because of the wind effect. The TRN simulation results indicate that the proposed formula calculates the closest points more accurately than the conventional formula. MDPI 2019-04-09 /pmc/articles/PMC6480591/ /pubmed/30970622 http://dx.doi.org/10.3390/s19071688 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Oh, Juhyun
Sung, Chang-Ky
Lee, Jungshin
Lee, Sang Woo
Lee, Sang Jeong
Yu, Myeong-Jong
Accurate Measurement Calculation Method for Interferometric Radar Altimeter-Based Terrain Referenced Navigation †
title Accurate Measurement Calculation Method for Interferometric Radar Altimeter-Based Terrain Referenced Navigation †
title_full Accurate Measurement Calculation Method for Interferometric Radar Altimeter-Based Terrain Referenced Navigation †
title_fullStr Accurate Measurement Calculation Method for Interferometric Radar Altimeter-Based Terrain Referenced Navigation †
title_full_unstemmed Accurate Measurement Calculation Method for Interferometric Radar Altimeter-Based Terrain Referenced Navigation †
title_short Accurate Measurement Calculation Method for Interferometric Radar Altimeter-Based Terrain Referenced Navigation †
title_sort accurate measurement calculation method for interferometric radar altimeter-based terrain referenced navigation †
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6480591/
https://www.ncbi.nlm.nih.gov/pubmed/30970622
http://dx.doi.org/10.3390/s19071688
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