Methodology for assessing the accuracy and noise immunity of consumer navigation equipment during incoherent processing of a multiplexed signal with a reduced level of out-band emission


Аuthors

Nerovny V. V.1, Radko V. S.1, Citiridis V. V.1, Tolstykh M. Y.2, 3*

1. Air force academy named after professor N.E. Zhukovskii and Y.A. Gagarin, Voronezh, Russia
2. Moscow State Linguistic University, Moscow, Russia
3. Kikot Moscow University of the Ministry of Internal Affairs of Russia, Moscow, Russia

*e-mail: marina_lion@mail.ru

Abstract

The scientific article pertains to the field of theoretical and applied research related to Global Navigation Satellite Systems (GNSS), with a primary focus on the development and enhancement of Local Navigation Systems (LNS). These systems serve as functional augmentations to GNSS, allowing for improved accuracy and reliability of positioning in environments where satellite signal reception is challenging. One of the advantages of such systems is the mitigation of signal distortions and the increase in signal power at the input of the user's navigation equipment (UNE). The article presents an approach to addressing a current scientific challenge in the field of navigation: the development of methods and devices for generating signals with improved electromagnetic compatibility (EMC) characteristics and reduced out-of-band emissions (OOBE). The study focuses on advanced time-multiplexed binary offset carrier (TMBOC) signals, which offer advantages over traditional signals due to their high spectral power density in the main frequency band. It is acknowledged, however, that the use of TMBOC signals in LNS can lead to increased OOBE, necessitating adherence to EMC requirements with other radio electronic equipment (REE). To reduce OOBE and enhance EMC characteristics, the article proposes signal filtering methods, particularly using filters with a «raised cosine impulse response». These filters minimize signal distortions and lower OOBE levels. Experimental models developed in the MatLab/Simulink environment have confirmed the effectiveness of these methods. The article also analyzes non-coherent signal processing, which is widely used in GNSS UNE to simplify receiver architecture.
Methodologies for assessing the accuracy and interference immunity of GNSS UNE during non-coherent processing of multiplexed signals are developed and characterized. The research findings indicate that while the use of TMBOC signals with improved EMC characteristics results in increased interference immunity, there is a slight loss in positioning accuracy. These results can be utilized for the further development of navigation systems and the enhancement of their performance in challenging operational conditions.

Keywords:

local navigation system, filter with «raised cosine» characteristic, multiplexed signal, out-of-band emission, consumer equipment

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