V.A. Bulanov¹, M. Mussalam², S.L. Ivanov³, A.U. Truschinsky⁴

1−4 MESC AF «N.E. Zhukovsky and Y.A. Gagarin Air Force Academy» (Voronezh, Russia)

Thanks to the implementation of coherent operating modes in modern radio altimeters, it became possible to additionally assess the ground and vertical speed of the aircraft based on the analysis of the echo signal power spectrum. However, the disadvantages of the known method of estimating the altitude and speed parameters of an aircraft flight based on the analysis of the power spectrum of the echo signal of a coherent radio altimeter are the high level of errors in estimating the ground and vertical speed of the carrier due to the lack of consideration in the mathematical model of the power spectrum of the echo signal of radiation received from the side lobes of the antenna pattern of a coherent radio altimeter, as well as high requirements for the computational characteristics of the signal processing system that do not allow the method to be implemented for the duration of the radiation session.

The aim of article to development of a method for estimating the altitude and speed parameters of an aircraft based on the analysis of the power of the echo signal of a coherent radio altimeter, which allows measuring the ground, vertical speed of the carrier and height with an acceptable fluctuation error for the duration of the radiation session. As a result of the conducted research, a method for estimating the flight altitude, ground and vertical speed of an aircraft based on the spectral analysis of the echo signal of a coherent radio altimeter was developed, a mathematical model of the power spectrum of the echo signal of a coherent radio altimeter was proposed and justified based on the approximation of the complex frequency response of the Doppler filter by a fractional rational function, the potential accuracy of the estimation of flight altitude, ground and the vertical speed of the aircraft in a developed way.

The developed method can be used by developers of modern and promising coherent radio altimeters. Information about altitude and speed parameters can be used in the complex processing of aircraft navigation information.

Bulanov V.A., Mussalam M., Ispulov A.A., Truschinsky A.U. Application of spectral analysis of a coherent radio altimeter signal to ensure aircraft navigation. Electromagnetic waves and electronic systems. 2022. V. 27. № 6. P. 65−72. DOI: https://doi.org/10.18127/j15604128-202206-09 (in Russian)

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