FIELD: radio engineering.
SUBSTANCE: on the receiving device of the software-configurable radio, the LTE radio signal is captured from the radio air on the known carrier centre frequency, its transfer into information frequency domain and sampling with known bandwidth, then performing detection and adjustment to available on air primary synchronization signals, then performing detection and adjustment to available on air signals of secondary synchronization, then determining cell identifiers by primary and secondary synchronization signals of detected base stations received from radio air, then, for all established cell identifiers of base stations, a rough estimate of the time of arrival and frequency shift is performed based on the received LTE signals for initial frame synchronization by calculating correlation functions of received signal with local copies of reference signals of primary and secondary synchronization, then performing the received signal samples conversion into a frequency-time frame structure for subsequent extraction of reference signals of cells, then performing the capture refinement and the arrival time parameters extraction from the reference signals of the cells, transmitted in a wider frequency band, compared to the primary and secondary synchronization signals, then performing the adjustment and tracking of short-term primary measurements of the time of arrival of the signal, then collecting measurements of the observed difference in the time of arrival of the signals, then obtaining the coordinates of the base stations and, finally, performing secondary processing of the primary measurements of the observed difference in the time of arrival of the signals by one of the hyperbolic positioning methods with the resulting evaluation of the coordinates of the device, wherein the procedure for rough estimation of time and frequency detuning is implemented at the search stage through the phase difference parameter of correlation peaks of two equal segments of the primary synchronization signal on the transmission interval of one LTE frame.
EFFECT: higher accuracy and speed of determining spatial coordinates of a mobile device operating on software-configurable radio technology, which may not be a subscriber of cellular LTE networks, in the absence of signals from global navigation satellite systems.
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