V.V. Nerovny1, A.V. Zhuravlev2, T.U. Uryvskaya3, P.D. Korataev4

1,2 JSC RIE “PROTEK” (Voronezh, Russia)

3,4 Military Air Academy named after professor N.E. Zhukovsky and Yu.A. Gagarin (Voronezh, Russia)

Problem statement. One of the directions of development and improvement of satellite radio navigation is the development of functional complement subsystems based on local navigation systems operating autonomously, without the use of navigation satellite signals. The use of signals from global navigation satellite systems with a high level of out-of-band radiation in local navigation systems leads to a deterioration in electromagnetic compatibility with other radio-electronic means operating in the common frequency band.

Purpose. Reducing the level of out-of-band radiation from transmitters of local navigation systems by generating signals using baseband filters with a "raised cosine" pulse characteristic.

Results. Analytical expressions are obtained for baseband filters with a "raised cosine" pulse characteristic used to generate navigation signals with meander modulation at subcarrier frequencies. The simulation has shown that by selecting the value of the rounding coefficient, it is possible to obtain navigation signals with the necessary level of out-of-band radiation, providing electromagnetic compatibility with other radio-electronic means operating in the common frequency band.

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

Nerovny V.V., Zhuravlev A.V., Uryvskaya T.U., Korataev P.D. Mathematical models of navigation signals with the required form of spectral power density. Radiotekhnika. 2022. V. 86. № 7. P. 69−75. DOI: https://doi.org/10.18127/j00338486-202207-12 (In Russian)

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