METHOD OF DETERMINING DIRECTION OF HYDROACOUSTIC TRANSPONDER IN MULTIBEAM NAVIGATION SIGNAL PROPAGATION CONDITIONS Russian patent published in 2014 - IPC G01S3/80 

FIELD: physics, acoustics.

SUBSTANCE: invention relates to hydroacoustics. The method of determining the direction of a hydroacoustic transponder in multibeam navigation signal propagation conditions involves determining direction simultaneously in horizontal and vertical planes towards a hydroacoustic transponder by receiving the transponder signal using an antenna array, amplifying the received signal with preamplifiers connected to the output of each converter of the antenna array and digitising with sampling frequency F_s. The transponder emits, in response to a request of a hydroacoustic navigation system, a composite navigation signal at carrier frequency, subjected to phase-shift keying according to a Gold code sequence law; the signal received by each converter of the antenna array is filtered by a digital filter which is matched with the navigation signal, and the duration of the navigation signal is selected such that the greatest Doppler distortion of the navigation signal, which corresponds to the range of possible velocities of the carrier of the antenna array relative a stationary transponder, leads to mismatch of the filter and the received navigation signal.

EFFECT: reducing hardware and computational resources when designing a hydroacoustic navigation system with an ultra-short base.

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