VESSEL SPEED MEASURING METHOD 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. Technical problem to be solved is increase in the Doppler log reliability and accuracy without significant increase in the equipment price and dimensions. This technical result is achieved by application of one of three technical solutions or the combination thereof. First technical solution consists in the formation during reception, in addition to the HN in the radiation direction (relative to the normal to the antenna plane), of the two-dimensional HN fan, in aggregate of the sector overlapping spatial angles, in which reflected from the bottom echo signal arrival is possible. Second technical solution consists in that the sounding signals are emitted at the moments, when the vessel roll angle or trim angle is equal to zero. Third technical solution consists in that the sounding signals are emitted at arbitrary moments of time, however, the emission angles (relative to the normal to the water mirror) are memorized, and the HN fan during the reception is formed around the radiation direction relative to the vertical line.

EFFECT: increase in the vessel speed measurement accuracy and noise immunity under conditions of rolling in rough water.

3 cl, 9 dwg