METHOD OF LOCATING SATELLITE COMMUNICATION EARTH STATION FROM RELAYED SIGNAL Russian patent published in 2025 - IPC H04K3/00 

FIELD: radio engineering.

SUBSTANCE: invention relates to radio engineering, specifically to methods for determining the location (DM) of a radio-frequency source, and can be used for DM of satellite communication earth stations (ES). Additionally, a low-orbit spacecraft (LOS), a control station (CS) of LOS, and the earth station for determining the location (ESDL) is made comprising a two-channel coherent radio receiving device (RRD) with a unit for calculating coordinates and an antenna system of two antennae, one of which automatically tracks the direction to the LOS, and the other is oriented in the direction of the "main" spacecraft (SC), located on the geostationary orbit and providing relay of the ES signals along the main lobe of the beam pattern, on the basis of the descending line of SC signals in the ESDL, the ES signals are detected, demodulated, technical analysis is performed, the central frequency F_i and the spectrum width ΔF_i are determined, based on the frequency plan of the SC, frequency parameters F_Bi and ΔF_Bi of the ES uplink are determined, the obtained values of F_Bi and ΔF_Bi is transmitted to the LOS CS, the functions of which include the prediction of the date and time of the LOS location in the electromagnetic accessibility zone of the ES, the ESDL and the CS, setting the LOS the time for switching on t_on and switching off t_off of the repeater located on its board, parameters of retransmitted signal F_i, ΔF_i and F_bi, ΔF_b£, time of transmitting messages to the CS on the current coordinates of the LOS (x, y, z, t_n), n=1, 2, …, N, N is number of messages during flight over search area, N>3, well-timed orientation of the antenna of the ESDL to the space station is carried out based on the TLE-parameters of its orbit, the current frequency instability of the receiving channels of the RRD in the band ΔF_i at time t_n is eliminated, based on the coordinates of the SC and the LOS and the ES signals relayed by them at fixed time moments t_n, N delays in receiving signals Δτ_1,N are determined and further, using the difference-ranging method, the coordinates of the ES are found.

EFFECT: high accuracy of the DM of the ES signal due to increased spatially independent statistics of estimating signal delays Δτ_1,N, N>3, and maintaining its operability in the absence of two auxiliary spacecraft (SC).

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