CORRELATION HYDROACOUSTIC LAG Russian patent published in 2019 - IPC G01S15/00 

FIELD: hydro acoustics.

SUBSTANCE: invention relates to underwater acoustics, and more specifically to navigation devices, specifically to logs, and can be used to improve the accuracy of measuring the speed of movement of surface ships, submarines and other ships of water transport at small and deep depths. Principal difference of the proposed device from the prototype is that it additionally includes a low-frequency correlation block of the CCF at zero time delay, consisting of the third block of the additional time delay τ_P sequentially connected and the third multiplying device and also additionally included in the low-frequency correlation unit of the CCF the second block of the additional time delay τ_P, the output of which is connected to the second input of the second multiplying device, and also the first block of the additional time delay τ_P included in the ACF correlation unit, the output of which is connected to the first input of the first multiplying device of the correlation block ACF, and the input is connected to the output of the block adjustable time delay τ_R, which is connected in parallel with the second block of the additional time delay τ_P low-frequency correlation block CCF, and also a unit for comparing the works of the ACF and the CCF, the first input of which is connected to the output of the first multiplying device of the correlation block of the ACF, and the second input is connected to the output of the second multiplying device of the low-frequency correlation block of the CCF, output of the unit for comparing the work of the ACF and the CCF is connected to the input of the second integrator, the output of which is also connected to the second input of the block of adjustable time delay τ_P correlation block ACF, as well as a setting corrector values (lag corrections), the output of which is connected to the second input of the computing unit; in addition, the output of the first detector is connected in parallel with the second input of the third block of the additional time delay τ_P a low-frequency correlation unit CCF at zero time delay and with the second input of the first multiplying device of the correlation unit ACF, and the output of the second detector is connected to the first input of the third multiplying device of the low-frequency correlation block CCF at zero time delay, the output of which is connected to the input of the first integrator, the output of which is connected to the input of the adaptation unit, output of which is connected in parallel with the second input of the first block of additional time delay τ_P correlation block ACF, second input of the second block additional time delay τ_P low frequency correlation unit CCF and the second input of the third block additional time delay τ_P low-frequency correlation block CCF at zero time delay. In the detection mode of the full speed module, the first detector is additionally connected in parallel with the second block of the additional time delay τ_P low frequency correlation unit CCF, and a block of adjustable time delay τ_R correlation block ACF connected only with the first block of additional time delay τ_R correlation block ACF.

EFFECT: improvement of the design and technological indicators of the device, increasing the stability of the entire scheme, the possibility of entering lag correction values determined on the measuring line, will lead to an increase in the accuracy of determining the speed of the ship when maneuvering in different sea conditions.

3 cl, 2 dwg