METHOD FOR DETERMINING RELATIVE RANGE FROM RADIO SIGNAL SOURCE Russian patent published in 2021 - IPC G01S5/06 G01S3/48 G01S13/08 G01S13/32 G01S13/48 H04B7/04 

FIELD: radio navigation.

SUBSTANCE: invention can be used to determine relative distances from a radio emission source (RS) located on a stationary or mobile object. In the method, a radio signal is synchronously formed 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 three harmonic vibrations of the first group is common with one of three harmonic vibrations of the second group. At each station, radio signal transmitted from the object is received in quadrature synchronized manner. Its digital quadrature components (DQC) are formed step by step with a given sampling rate and number of clock cycles in a cycle. According to generated DQC, next three pairs of digital quadrature components (QC) corresponding to components of transmitted radio signals are formed in predetermined manner. Then, three pairs of digital quadrature components corresponding to indicated groups are formed from them by summing each of obtained QCs of the corresponding pair. Using digital quadrature components obtained in this way, parameters given in the method are formed and time delays (TD) are determined from them. The TD's are transmitted to single center for receiving and processing radio signals, where they are corrected, excluding time shifts known that occur when receiving radio signals and processing them at stations. Based on corrected TD, relative distances from the RS to station antennas are determined exactly. The method allows excluding the influence of radio signals reflected, for example, from the ground, and random phases of transmitter and receiver local oscillators. No common synchronization is required between RS and plurality of receiving stations.

EFFECT: increase in accuracy and expansion of zone of unambiguous determination of mentioned relative ranges.

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