Zakharchenko V.D., Zakharchenko S.V., Yakimets A.L. Numeric modelling of low-altitude altimeter with double frequency modulation

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ttps://doi.org/10.15688/mpcm.jvolsu.2020.3.1

Vladimir D. Zakharchenko
Doctor of Technical Sciences, Professor, Professor Of Department of Radiophysics,
Volgograd State University
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Prosp. Universitetsky, 100, 400062 Volgograd, Russian Federation

Sergey V. Zakharchenko
Candidate of Physical and Mathematical Sciences, Programmer,
Open Systems LLC
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Kirova street, 121a, apt. 213, 400067 Volgograd, Russian Federation

Andrey L. Yakimets
Candidate of Physical and Mathematical Sciences,
Head of the Department of Radio Physics,
Volgograd State University
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Prosp. Universitetsky, 100, 400062 Volgograd, Russian Federation

Abstract. This study is concerned with the problem of increasing the accuracy of a low-altitude altimeter employing the frequency modulation principle. A way to suppress the "discrete error" of the altimeter by employing additional «slow» frequency modulation of the carrier wave and averaging the resulting counts is considered. The benefit of such approach is simplicity of technical implementation manifesting in minimal changes in the microwave path and the recording device, which needs to run in averaging count mode. It is shown that, given a limited frequency band, the linear modulation form is not optimal. Results of error calculations presented are obtained via mathematical modelling of the altimeter’s operation for different shapes of the additional prequency modulation. It is shown that using complex shapes of the «slow» modulation with positive third derivative and optimizing for a given altitude range allows to reduce the average measurement error 2–3 times additionally relatively to the linear modulation form without expanding the occupied frequency band.

Key words: low-altitude altimeter; modulation shape; distance measurement accuracy.

Numeric modelling of low-altitude altimeter with double frequency modulation by Zakharchenko V.D., Zakharchenko S.V., Yakimets A.L. is licensed under a Creative Commons Attribution 4.0 International License.

Citation in English: Mathematical Physics and Computer Simulation. Vol. 23 No. 3 2020, pp. 5-11

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