V.N. Bondarenko1, V.F. Garifullin2, A.K. Dashkova3, A.I. Zuevskaya4, P.A. Lopardin5, D.S. Feoktistov6

1-6 Institute of Engineering Physics and Radioelectronics of the Siberian Federal University (Krasnoyarsk, Russia)

3 JSC “NPP “Radiosvyaz” (Krasnoyarsk, Russia)

Problem statement. The usage of a noise-like MSK signal has become a very effective solution for creating a number of broadband radio engineering systems. In particular, broadband mid-frequency radio navigation systems. However, from the experience of using such systems based on phase measurements, one of the main problems in measuring range is the elimination of ambiguity of phase measurements. In a broadband mid-frequency radio navigation system, this task is solved in a delay tracking system by measuring the delay time of the signal by the delay of the rangefinder code. The most specific element of the delay tracking system is a time discriminator, the structure and characteristics of which are determined by the type of modulation and parameters of the broadband signal. This article analyzes the limiting the spectrum effect of a noise-like MSK signal on the characteristics of the delay tracking system time discriminator.

Purpose. To analyze the accuracy of the noise-like signal rangefinder code delay measuring with MSK modulation when the radio path band is limited in broadband radio engineering systems of the midrange range and the corresponding change in the signal-to-noise ratio.

Results. Statistical modeling of the delay tracking system at different values of the radio path bandwidth, time discriminator parameters and signal-to-noise ratio has been carried out. It is shown that the bandwidth of the radio path can be reduced from 0.6 to 0.4 MHz without a noticeable increase in the random error of the delay measurement and while maintaining the required reliability of eliminating the ambiguity of phase measurements. An increase in the frequency of the pseudo-random sequence characters by 2 times while maintaining the 0.6 MHz radio frequency band leads to a decrease in the error of measuring the delay by about 1.5 times.

Practical significance. Recommendations are given on the choice of both the characteristics of the time discriminator and on the construction of a delay tracking system as a whole, which will at least not worsen, and in some cases even improve a number of technical characteristics, for example, the Sprut mid-range radio navigation system.

Bondarenko V.N., Garifullin V.F., Dashkova A.K., Zuevskaya A.I., Lopardin P.A., Feoktistov D.S. Analysis of the signal delay tracking system for broadband radio systems. Radiotekhnika. 2023. V. 87. № 1. P. 40−49. DOI: https://doi.org/10.18127/j00338486-202301-04
(In Russian)

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