METHOD FOR MEASURING VESSEL SPEED BY THE DOPPLER LOG Russian patent published in 2018 - IPC G01S15/58 

FIELD: measuring equipment.

SUBSTANCE: invention relates to the field of navigation, namely to the ship absolute speed measurement methods and devices. Claimed method is achieved by the following actions: upon detection of each echo, in addition to determining its frequency, the time of its detection with respect to the time of emission of a probing signal is determined; estimation of frequencies and detection times of echoes detected at different emission cycles of the probing signal, before averaging are subjected to a trajectory analysis, realized, for example, using the Wald sequential analysis algorithm. As a result of the trajectory analysis, the echoes reflected from the seabed are separated from the echoes reflected from the sound-scattering layers; averaging of echo signal frequencies is performed separately for echoes reflected from the seabed, and echoes reflected from each sound-scattering layer.

EFFECT: increasing the reliability of the detection of echoes reflected from the seabed, in the presence of an input signal, except echoes, reflected from the seabed, as well as echoes reflected from the water sound-scattering layers.

3 cl, 2 dwg