METHOD FOR DETERMINING RELATIVE DISTANCES TO FACILITY Russian patent published in 2021 - IPC G01S5/06 G01S3/48 G01S13/08 G01S13/32 G01S13/48 H04B7/04 

FIELD: radio navigation.

SUBSTANCE: invention relates to radio navigation and can be used to determine relative distances to a facility, including a mobile one, from earth-based system stations. Said method includes as follows: at each station, a radio signal is transmitted synchronously in the form of two groups, each of which is formed out of three components, which are harmonic oscillations with equal amplitudes and with preset frequencies. One of the three harmonic vibrations of the first group is common with one of the three harmonic oscillations of the second group. At the facility, a set of radio signals transmitted by the stations is received in a quadrature manner. Digital quadrature components (DQC) corresponding to the received set of radio signals are formed one by one with the preset sampling frequency and the number of clock steps in a cycle. According to the generated DQC, the next three pairs of digital quadrature components (QC) corresponding to the components of the transmitted radio signals are formed in a predetermined manner. Then three pairs of digital quadrature components corresponding to the indicated groups are formed out them by summing each of the obtained QCs of the corresponding pair. Using the digital quadrature components obtained in this way, the parameters given in the method are developed and the time delays are determined according to the resulting parameters. Time shifts arising from the formation of radio signals at the stations are excluded. Based on the corrected time delays, the relative distances from the PhC antennas of the stations to the phase center (PhC) of the facility antenna are determined in a unique manner. The method enables to exclude the influence of radio signals reflected, for example from the Earth, and random phases of heterodynes of the transmitters and the receiver. No common synchronization is required between the facility and the set of transmitted stations.

EFFECT: increased accuracy and enhanced zone of unambiguous determination of the mentioned relative distances.

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