An underwater magnetic detection system towed by an unmanned ship

Abstract

The invention discloses an unmanned-ship-towed underwater magnetic detection system. The unmanned-ship-towed underwater magnetic detection system comprises an unmanned ship, a towed body connected with the unmanned ship by virtue of a towrope as well as a control system used for data processing and automatic control of the magnetic detection system; the unmanned ship is a water surface platform ofthe magnetic detection system and comprises a ship body of the unmanned ship, a winch system arranged at the tail of the unmanned ship, a detection system arranged at the head of the unmanned ship aswell as a communication system used for real-time communication between the unmanned ship and a shore station; and the winch system is used for controlling underwater movement of the towed body by laying and recycling a towrope and comprises a motor, the towrope used for towing the towed body, a winch used for coiling the towrope thereon as well as a mounting bracket. The unmanned-ship-towed underwater magnetic detection system disclosed by the invention has the beneficial effects that the magnetic detection system utilizes an underwater magnetic detection location technology, the unmanned ship on water is taken as a mother ship towing body, the towed body carries a three-component magnetometer array, and near-bottom target detection and location is performed.

Description

technical field [0001] The invention relates to an underwater magnetic detection system towed by an unmanned ship, belonging to the technical field of underwater detection. Background technique [0002] The detection and positioning of underwater small targets (the definition of small targets in this application is: objects with an area less than 1 square meter and a height of less than 1 meter) has always been a worldwide problem. Underwater acoustic technology is easily affected by the underwater environment. It is often difficult to find and locate when the mud bottom, the water cover is too thick, and the working water depth is too shallow. Underwater magnetic detection and positioning technology is a detection technology that obtains target position information by measuring the magnetic field anomaly signal of ferromagnetic objects. It has unique advantages for detecting and locating ferromagnetic targets underwater (especially buried in mud bottom). [0003] At presen...

AI Technical Summary

Problems solved by technology

[0003] At present, underwater magnetic detection mostly adopts a single-probe and walking-type working mode, but the existing detection methods focus on large-scale and large-area marine geospatial magnetic field detection, and the accuracy is not high, which is difficult to meet the requirements of searching for small underwater targets. , as shown in the patent CN 102826208 A, the marine magnetism measurement towing device uses the mother ship to tow the floating body to detect the magnetic field, but the magnetometer carried by the floating body enters the water very shallowly, and the single probe cannot determine the target position, so it cannot detect the small ferromagnetic target on the bottom of the water. Near-bottom detection (in this application, small targets are defined as near-bottom: the height from the bottom is less than 5 meters)

[0004] At present, there are few domestic devices that specialize in magnetic detection of underwater targets, and most of them use manned boats tow and search, which is inefficient and time-consuming. For example, the method shown in patent CN 106980140 A uses a measuring network and a measuring ship. Underwater metal target detection, on the one hand, the layout of the measurement network is cumbersome, the measurement method is primitive, and the search efficiency is low. In addition, this method has high requirements on the site, and it can only be detected in waters less than 5 meters deep, which greatly limits the detection range.

[0005] Since the amount of magnetic anomaly change produced by a ferromagnetic target is related to the height of the probe from the measured target, the detection effect is more accurate when the probe is close to the measured target and maintains a certain distance. The existing underwater towed magnetic detection device does not take this into consideration. For example, the device for towing the towed body by a survey ship as shown in the patent CN 104793255 B, the manual cable retraction operation is cumbersome and complicated, and the length of the cable cannot be accurately controlled. Ability to follow and detect terrain fluctuations

[0006] Further, there are only underwater magnetic detection equipment at home and abroad, and there is no equipment integrating exploration and fishing. After detection, divers still need to go into the water to salvage

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