METHOD FOR DETERMINATION OF RELATIVE RANGES FROM A RADIO SOURCE 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 for determination of relative ranges from a radio source (hereinafter – RS) located on a stationary or mobile object. In the claimed method, a radio signal is synchronously generated and transmitted at the object 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 oscillations of the first group is common with one of the three harmonic oscillations of the second group. At each station, the radio signal transmitted from the object is quadrature synchronously received. Digital quadrature components (hereinafter – DQC) are formed, step-by-step, with a given sampling frequency and number of clock cycles. Three pairs of digital quadrature components (hereinafter – QC) corresponding to the components of the transmitted radio signals are extracted from the generated DQC 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 (hereinafter – TD) are determined relative to the k-th group of a given station. TD are transmitted to a single center for receiving and processing radio signals. By TD and meeting the conditions specified in the method, the relative ranges from RS to the station antennas are unambiguously determined, regardless of the distance of the moving object from the stations. The method eliminates the influence of radio signals reflected, for example, from the ground and random phases of the heterodyne of the transmitter and receivers. No common synchronization is required between RS and a set of receiving stations.

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

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