FIELD: navigation.
SUBSTANCE: secant alignments on the measured line, instead of visually well-distinguished buoys, are equipped with radio-acoustic buoys with directional sonar antennas, which makes it possible to take the direction finding of the UV when it moves under the water and, by equality of the second derivative of the bearing to zero, to detect the moment the underwater vehicle crosses the secant alignment.
EFFECT: ensuring the specified accuracy of calibration of the logs installed on the UVs during movement under water.
1 cl, 2 dwg
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