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Electronics 2018, 7(9), 191; https://doi.org/10.3390/electronics7090191

Possibilities of Increasing the Low Altitude Measurement Precision of Airborne Radio Altimeters

1
Faculty of Aeronautics, Technical University of Košice, Rampová 7, Košice 041 21, Slovakia
2
Institute for Computer Technologies and Information Security, Southern Federal University, Chekhova 2, Taganrog 347922, Russia
3
Department of Radio Engineering Systems, Saint Petersburg Electrotechnical University, Professora Popova 5, Saint Petersburg 197376, Russia
4
Institute of High Frequency Technology, Hamburg University of Technology, Denickestraße 22, Hamburg 21073, Germany
5
Faculty of Electrical Engineering and Informatics, Technical University of Košice, Letná 9, Košice 042 00, Slovakia
*
Author to whom correspondence should be addressed.
Received: 7 August 2018 / Revised: 3 September 2018 / Accepted: 9 September 2018 / Published: 11 September 2018
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Abstract

The paper focuses on the new trend of increasing the accuracy of low altitudes measurement by frequency-modulated continuous-wave (FMCW) radio altimeters. The method of increasing the altitude measurement accuracy has been realized in a form of a frequency deviation increase with the help of the carrier frequency increase. In this way, the height measurement precision has been established at the value of ±0.75 m. Modern digital processing of a differential frequency cannot increase the accuracy limitation considerably. It can be seen that further increase of the height measurement precision is possible through the method of innovatory processing of so-called height pulses. This paper thoroughly analyzes the laws of height pulse shaping from the differential frequency presented by the number that represents the information about the measured altitude for this purpose. This paper presents the results of the laboratory experimental altitude measurement with the use of a so-called double-channel method. The application of obtained results could contribute to the increase of air traffic safety, mainly in the phase of the aircraft approaching for landing and landing itself. View Full-Text
Keywords: airborne radio altimeter; methodological error; increase of measurement accuracy; height pulses; dual-channel method airborne radio altimeter; methodological error; increase of measurement accuracy; height pulses; dual-channel method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Labun, J.; Krchňák, M.; Kurdel, P.; Češkovič, M.; Nekrasov, A.; Gamcová, M. Possibilities of Increasing the Low Altitude Measurement Precision of Airborne Radio Altimeters. Electronics 2018, 7, 191.

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