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Small-depth Doppler log

A Doppler log and deep technology, applied in the field of nautical log, can solve the problems of complex process and high price

Inactive Publication Date: 2011-05-25
CSSC MARINE TECH CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The current Doppler log has defects: the large-depth Doppler log using phased array can measure the speed of the ship to the bottom or to the water, but its process is complicated and expensive; the other is miniaturization The water Doppler log is small in size and cheap in price, but it can only measure the speed of the seabed

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Embodiment Construction

[0020] In terms of system control: within a water depth of 200m, it is in the working state against the bottom, and transmits high and low power according to different depths; when it exceeds 200m, it can automatically switch to the working state against the water. In addition, these two working states can be manually switched through the keyboard on the display.

[0021] In terms of software processing: in the bottom working state, the submarine scattering signal is denoised and amplified by the receiver, and the signal envelope, real part and imaginary part are obtained through the logarithmic detector and quadrature converter, and then echoed in the DSP component The measurement of the arrival time, the judgment of the signal threshold and the frequency measurement of the complex correlation of the signal, so as to solve the speed and depth of the ship relative to the bottom of the sea.

[0022] When the water depth exceeds 200m and the seabed scattering signal is less than...

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Abstract

The invention discloses a small-depth Doppler log and relates to the field of navigation log. The conventional Doppler log has the disadvantages that: a phase-array large-depth Doppler log is used for measuring the speed of a ship relative to a sea bottom or seawater, but the process is complex and the price is high; moreover, a miniaturized relative-to-water Doppler log has a small size and is low in price, but can only measure the speed of the ship relative to the sea bottom. The invention provides the small-depth Doppler log, which can measure the speed of the ship relative to the seawater and the sea bottom, and has a simple process and is low in price compared with the phase-array large-depth Doppler log. In the water depth range of 200m, the speed of the ship relative to the sea bottom can be measured by using a scattered signal at the sea bottom; and when the water depth is more than 200m, the speed of the ship relative to the seawater can be measured by using a volume scattering signal of a water layer with certain thickness 10m deep under the surface of a transducer array. The small-depth Doppler log mainly comprises an underwater transducer array, a junction box, a mainframe (comprising a receiving / transmission system), a main display and a power box.

Description

technical field [0001] The invention relates to the field of navigation log, in particular to a Doppler log, which belongs to underwater acoustic navigation instruments. Background technique [0002] At present, in the navigation system, the speed log can be used to continuously measure the speed of the moving ship and calculate the cumulative voyage of the ship. In the 1930s, Saar-type water pressure loggers and Chernikov-type rotary wheel loggers appeared; in the 1950s, electromagnetic loggers appeared. All the above-mentioned odometers measure the speed and distance of the ship relative to the water. Only by correcting it according to the velocity and direction of the water can the speed and distance of the ship relative to the bottom of the water be obtained. In addition, installation and maintenance are troublesome. The Doppler log, which appeared in the 1970s, can directly measure the speed and distance of the ship relative to the bottom of the water, making the log d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S15/88
Inventor 吴兆臻
Owner CSSC MARINE TECH CO LTD
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