METHOD FOR DETERMINING RELATIVE DISTANCES TO OBJECT 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 the relative distances to an object, including a mobile one, from stations of a ground system. According to the present method, at each station, a radio signal is transmitted synchronously in the form of two groups, each of which is formed from three components, which are harmonic oscillations with equal amplitudes and with given frequencies. One of the three harmonic vibrations of the first group is common with one of the three harmonic vibrations of the second group. At the facility, a set of radio signals transmitted by the stations is received quadrature. Digital quadrature components (CQC) corresponding to the received set of radio signals are formed one by one with a given sampling frequency and the number of clock cycles in a cycle. Three pairs of digital quadrature components (QCs) corresponding to the components of the transmitted radio signals are extracted from the generated CQCs and formed for each group. Then, by accumulating QC for a given number of clock cycles, three pairs of digital quadrature components corresponding to the indicated groups are formed. Using the digital quadrature components obtained in this way, the parameters given in the method are formed and, using them, for each k-th group of stations, time delays relative to the k-th group of a given station are determined. Based on the time delays and when the conditions specified in the method are met, the relative distances to the phase center (FC) of the antenna of the object from the FC antennas of the stations in the zone of unambiguous determination of the relative distances are uniquely determined, regardless of the distance of the moving object to the stations. The method makes it possible to exclude the influence of radio signals reflected, for example, from the ground, and random phases of the local oscillators of the transmitters and the receiver. No common synchronization is required between the object and the set of transmitted stations.

EFFECT: increased accuracy and increased zone of unambiguous determination of relative ranges.

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