A methodology for assessing the accuracy of solving a navigation problem by an aircraft with a two-channel coherent radio altimeter

Аuthors

Korataev P. D.^1*, Matveev S. S.^1**, Naberezhnev D. Y.^1***, Tolstykh M. Y.^{2, 3****}

1. Air force academy named after professor N.E. Zhukovskogo and Y. A. Gagarin, 54a Starye Bolshevikov str., Voronezh, 394064, Voronezh Region
2. Moscow State Linguistic University, Moscow, Russia
3. Kikot Moscow University of the Ministry of Internal Affairs of Russia, Moscow, Russia

*e-mail: korataev2015@mail.ru
**e-mail: gres02@yandex.ru
***e-mail: dimnabr@yandex.ru
****e-mail: marina_lion@mail.ru

Abstract

The relevance of the study is due to the need to improve the accuracy and reliability of autonomous aircraft navigation in conditions of unavailability or failure of global navigation satellite systems. In such situations, the free-form inertial navigation system, working offline, accumulates errors, which significantly reduces the accuracy of the navigation solution. In this regard, it seems advisable to use additional information from a two-channel coherent radio altimeter as part of an integrated navigation filter as a correction channel for a strapless inertial navigation system. The radio altimeter provides height measurements above the underlying surface, which can be effectively compared with a digital terrain model, allowing you to refine the spatial position of the aircraft. A methodology is being developed to assess the accuracy of solving a navigation problem by an aircraft with a two-channel coherent radio altimeter. According to the developed methodology, based on mathematical modeling, an assessment of the accuracy of performing an autonomous flight of an aircraft along a given route with guidance to intermediate points of the route using the heading method was carried out. At the same time, the following navigation equipment was used as a source of navigation information for consumers of global navigation satellite systems, a free-form inertial navigation system and a two-channel coherent radio altimeter with the ability to measure the components of the carrier's speed. The developed technique makes it possible to provide a significant increase in the accuracy of autonomous guidance of an aircraft along a route when using additional information from a two-channel coherent radio altimeter in the operation of an integrated navigation filter.

Keywords:

: guidance system, integrated information processing, free-form inertial navigation system, navigation equipment for consumers of global navigation satellite systems, two-channel coherent radio altimeter, estimation of carrier speed, overshoot

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