M.V. Kulikov¹, M.P. Sagalaev², P.A. Kistanov³, V.A. Lobov4

1  Military Telecommunications Academy (St. Petersburg, Russia)

2,3 LTD «STC» (St. Petersburg, Russia) 4  Military unit 21882 (Moscow, Russia)

The known algorithms for determining the phase and frequency detuning of radio signals in geolocation systems use a signal from their own active reference station with known coordinates, which sends the signals in the direction of the satellites and this signal is received by the  geolocation station. A copy of the reference radio signal with a single time stamp is transmitted to the geolocation station, and on the correla-N |m| 1 n tion processing, frequency Kxy(m, f ) 1  rxy(n m, )e i2 fxy F and phase     xy x y detuning are determined. N| m| n0

The use of a proprietary reference station introduces significant limitations. 

However, in the transponders radiations, in most cases, signals legitimate (reference) stations communication and broadcasting are presents, for which it is possible to build a cross-correlation function for a short period of observation, in which phase and frequency detuning are not great and the copy signal has good correlation properties. The phase and frequency detuning calculated from the signals of the legitimate reference station can be successfully performed to compensate for the a and b signals of the desired sourcetion and there is no illegitimate radio emission in the satellite communication system.

Kulikov M.V., Sagalaev M.P., Kistanov P.A., Lobov V.A. Determination algorithm of radiosignals TDOA and FDOA parameters with geolocating in satellite communication systems. Achievements of modern radioelectronics. 2021. V. 75. № 4. P. 63–70. DOI: https://doi.org/10.18127/j20700784-202104-09 [in Russian]

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