METHOD OF MEASURING TIME OF ARRIVAL OF SIGNAL AND APPARATUS FOR REALISING SAID METHOD Russian patent published in 2013 - IPC H03C3/06 G01S11/02 

FIELD: radio engineering, communication.

SUBSTANCE: method of measuring the time of arrival of a four-position quadrature phase-shift keyed signal with a π/4 shift is characterised by that the signal is received, analogue-to-digital conversion of two signals is carried out using fast Fourier transform (FFT), spectrum values of one of the signals are multiplied with complex-conjugate spectrum values of the other signal, a discrete cross-correlation function (DCCF) of the signal is calculated using inverse FFT, a plurality of in-phase and quadrature readings are obtained and filtered with a cut-off frequency which corresponds to half the rate of the initial bit message, modulo 2π subtraction of the corresponding value of the delayed current signal phase from each obtained current phase is carried out, and the time of arrival of the signal is determined as an argument of the maximum of the DCCF of the signal by further correlation processing. The apparatus has units for implementing the method.

EFFECT: eliminating measurement errors caused by non-multiplicity of the duration of the signal symbol and sampling frequency of analogue-to-digital conversion of the received signal.

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