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

FIELD: radio engineering.

SUBSTANCE: method relates to radio engineering, specifically to methods for determining the location of radio-frequency sources, and can be used to determine the location of a satellite earth station (ES) by receiving and processing signals thereof relayed from spacecraft (SC) to an earth station for determining the location (ESDL). Additionally, used are M, M ≥ 2 of low-orbit spacecrafts (LSC), control station (CS) of LSC, ESDL contains M+1 channel coherent radio receiver (RR) with coordinates calculation unit and antenna system of M+1 antennas, M antennae automatically track the direction to the LSC, and Ant. 1 is oriented in the direction of the "main" SC₁, located on the geostationary orbit and providing relay of signals of the l-th ES along the main lobe of the beam pattern, based on the descending line of the signals of the SC₁ in the unit for calculating coordinates of the ESDL RR, the signals of the l-th ES are detected, technical analysis, determination of central frequency F_i and width of spectrum ΔF_i, determining frequency parameters F_ai and ΔF_ai of ascending line of l-th ES, obtained values of F_ai and ΔF_ai are transmitted to LSC CS, functions of which include forecasting the date and time of the LSC SC₂, ..., SC_M+1 location in the zone of electromagnetic accessibility of the l-th ES, the ESDL and the CS, task is sent to all M LSC via low-speed communication channel, time of switching on t_onm and switching off t_offm repeaters, parameters of relayed signal F_i, ΔF_i and F_ai, ΔF_ai, time of transmission of messages to CS on current coordinates of m LSC (x, y, z, t_n)_m, n = 1, 2, …, N, N is number of messages during flight over search area, t_n is the time of measuring coordinates of the LSC at the n-th point, m=2, 3, …, M+1, m is the number of the LSC, the coordinate-time data from all the M LSC are successively transmitted to the CS and then to the ESDL, timely orientation of Ant. 2, …, Ant. M+1 to corresponding LSC is carried out by TLE-parameters of their orbits, based on test radio signals emitted at time t_n, eliminating the current frequency instability of M+1 receiving channels of the RR in the frequency band ΔF_i, when determining the coordinates of the l-th ES of the M LSC, the signals of the l-th ES are received in the frequency band ΔF_ai and their retransmission to the ESDL in the band ΔF_i, which through Ant. 2, …, Ant. M+1 are supplied to the corresponding inputs of the RR, simultaneously signals of the l-th ES, relayed by SC₁, through Ant. 1 are fed to the first input of the RR, and based on the coordinates of SC₁ and M of the LSC and the signals of the l-th ES relayed by them at fixed time moments t_n, the M delays in receiving the signals Δτ_1,M in each of the N points of the space position of the LSC are determined using the correlation method.

EFFECT: high accuracy for determining the location of earth station by increasing the signal-to-noise ratio in adjacent spacecraft.

1 cl, 6 dwg