V.V. Nerovny1, A.V. Zhuravlev2, V.V. Kiryushkin3, V.V. Filonenko4, N.А. Nerovnaya5

1-3 JSC RIE “PROTEK” (Voronezh, Russia)

4,5 Military Air Academy named after professor N.E. Zhukovsky and Yu.A. Gagarin (Voronezh, Russia)

Problem statement. One of the ways to improve the accuracy characteristics of navigation equipment of consumers of global navigation satellite systems is the use of new types of navigation signals, in particular signals with double meander modulation at subcarrier frequencies. The disadvantage of these signals is the relatively high level of closely spaced side lobes of the autocorrelation function, which makes it difficult to solve the problem of unambiguous measurements during search and tracking.

Purpose. Improving the accuracy and unambiguity of measurements when searching for and tracking navigation signals with double meander modulation at subcarrier frequencies, by reducing the maximum level of the side lobes of the autocorrelation function, by selecting the initial phases of meander subcarrier oscillations.

Results. Analytical expressions are obtained for calculating the autocorrelation functions of navigation signals with double meander modulation at subcarrier frequencies. The simulation showed that by selecting the initial phases of subcarrier meander oscillations, it is possible to obtain a signal with the lowest possible level of the side lobes of the autocorrelation function.

Practical significance. The results can be used by specialists in the field of satellite radio navigation in the modernization of global navigation satellite systems.

Nerovny V.V., Zhuravlev A.V., Kiryushkin V.V., Filonenko V.V., Nerovnaya N.А. Autocorrelation functions of navigation signals
with meander modulation at two subcarrier frequencies. Radiotekhnika. 2022. V. 86. № 7. P. 56−61.
DOI: https://doi.org/10.18127/j00338486-202207-10 (In Russian)

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