China's independent research and development successful AUV magnetometer breaks the foreign technology blockade

[China Instrument Network Instrument R&D] In December 2015, the "Xiangyanghong 10" ship will carry the newly independently developed 4,500-meter deep-sea resource exploration system (AUV) "Qianlong 2" to the southwest Indian Ocean, China's polymetallic sulphides The exploration contract area is used for experimental applications and voyage surveys. Prof. Zhang Jinhui from the Second Research Institute of the State Oceanic Administration has worked hard on the "Qianlong II" as the vice chief engineer of the "Qianlong 2" project and the leader of the research team of the detection system. Recently, the reporter went to the Second Institute of Oceanography of the State Oceanic Administration in Hangzhou, Zhejiang and gave an exclusive interview with Zhang Jinhui.

Zhang Jinhui was interviewed by reporters. Photography Jiang Yiping

Independent research and development of AUV magnetometer breaks foreign technical barriers

In 2011, the National 863 Plan established the "Twelfth Five-Year Plan" major project "4,500-meter deep-sea resource independent survey system" and Zhang Jin-hui was appointed as the person in charge of the "4500-meter level deep-sea resource independent exploration system-detection system development" project. One of the main research contents of this topic is to develop a deep-sea AUV three-component magnetometer that can be used to detect near-bottom high-precision geomagnetic data and serve for the investigation of polymetallic sulphide resources. Because AUV three-component magnetometer can not only be used for scientific investigation, but also has military application value, it belongs to high-tech sensitive equipment. However, there is no precedent for the application of AUV magnetometer in China, and it is difficult for the foreign countries to block the high-precision three-component magnetometer from China. Imported foreign purchases, so to get AUV near-bottom magnetic measurement data, must rely on independent research and development, need to solve the magnetometer's high precision, miniaturization, strong magnetic gradient adaptability and AUV magnetic interference correction and other technical issues.

Since the establishment of the research group, they have devoted great efforts to the development of AUV magnetometers. First of all, they must develop high-precision, miniaturized, high-stability three-component magnetometers, and they must overcome the magnetic interference correction technology of AUV magnetometers. The research group adopted a non-magnetic probe module, 24-bit high-precision A/D conversion, and high integration and miniaturization of circuit design techniques. As small as each set of screws must pass the test of non-magnetic materials, through a large number of measured and components Stereotypes realize the high precision and miniaturization of AUV magnetometers. Due to the presence of magnetic substances such as submerged irons, floating irons, battery compartments, and electronic cabins on Qianlong II, it causes serious magnetic interference to magnetometer detection and affects the quality of the detection data of AUV magnetometers. Therefore, it must be reliable. The AUV magnetic measurement data with application value must solve the technical problem of magnetic interference correction of magnetometer by AUV. Zhang Jinhui's team read the foreign research data, combined with a large number of onshore and lake test data, using the "AUV circular rotation parameter fitting method" to solve the problem of AUV magnetometer magnetic interference correction. In the South China Sea sea trials in July and August of this year, the maximum working depth of the AUV magnetometer was 4,500 meters, which was normal during the sea trials. The detection data was corrected by magnetic interference. The magnetic measurement results were consistent with the international geomagnetic field query results in the survey area. The detection results were of good quality and the first AUV near-bottom magnetic survey was successfully implemented in China. Zhang Jinhui told reporters that at present, China's independent research and development of AUV magnetometer work is very stable, reliable performance, not only can be carried on the "Qian Long II" autonomous submersible, but also can be carried in the "Dragon Dragon", "Hippocampus" In the submersible. "Now, whether in terms of technology or materials, the deep-sea AUV magnetometer has no problem in achieving mass production," Zhang Jinhui said proudly.

"Qianlong 2" integrates light, sound and electricity sensors to detect synchronously and output data quickly.

"Qianlong II" integrates geophysical, physical oceanography, marine chemistry, and optical detection technologies. In addition to the development of magnetometers, the AUV detection system development team led by Zhang Jinhui is also responsible for the configuration, maintenance, and data of other detection sensors on the AUV. Processing analysis. This time the ocean 40 voyages, AUV detection system development research group is responsible for ensuring that the AUV detection equipment is working properly to ensure the quality of the detection data is reliable. In order to synchronize the time of each detection device, the detection data of each detection device of “Qianlong II” is transmitted to the AUV control center computer through the serial port for storage. Since the detection data of each detection device has no positioning information, it is necessary to integrate the positioning data obtained by the “Hyeonlong-2” integrated navigation and positioning system based on time information to obtain the position information. In order to ensure timely decision-making at sea, it is necessary to quickly obtain the AUV detection data processing result. . The research group developed the "AUV detection data management system" and "AUV multi-parameter detection data processing system", and it is well applied in the South China Sea sea trial. For more than 30 hours long voyage detection data, it can be in 3 hours. The data fusion, storage management, and output pre-processing results were carried out to provide a scientific basis for the next step in offshore operations.

Zhang Jinhui said that the oceanic expedition will travel to the Indian Ocean in the southwest, where the sea conditions are rather harsh and the topography of the seabed is complex. This will be a real test for the “Hyper Dragon II” and its detection equipment. The successful experience of this South China Sea sea trial will be passed. This is still full of confidence and believes that the AUV magnetometer will play an important role in the investigation of hydrothermal sulfide mineral resources. Zhang Jinhui explained that hydrothermal sulphide minerals are classified as active and inactive. For active hydrothermal sulphides, they can be detected by physical sea and ocean chemical sensors such as warm salt depth meters, multi-parameter water quality meters, and methane detectors. Abnormal fluid; and for non-active mining areas, these sensors will be powerless, and the use of AUV magnetometer can also detect the anomaly, AUV near-field magnetic data also on the three-dimensional structure of polymetallic sulphide mining areas, mining reserves research is important Scientific significance.

In order to "Qianlong II" chief designer moved tears AUV will be promising in the marine survey

Speaking of Qianlong II, Zhang Jinhui was very proud. He described the reporter who had not seen the true face of Qianlong II: “It has a beautiful appearance and is flat and fluid. Like a fish, it has very good maneuverability. "Designed for the complex terrain of the Indian Ocean in the Southwest Indian Ocean".

He also revealed to us a secret: At this time of the South Asia Sea Trial Meeting in Sanya, Liu Jian, chief designer of Qianlong II, was moved to tears. “The progress of the five subliminal tests that have just started is not going smoothly, although everyone knows that developing high-tech products will not always be easy. However, in real personal encounters, the research personnel are very worried about the failure of the sea trials. It took so much money to invest in research and development of an equipment. If the results of the final sea trial were unsuccessful, no one would like to see the result. Therefore, the pressure on all of us is very large. Fortunately, Liu Jian’s teacher is in dire straits, steadily and steadily, and solves step by step. After discovering the problem, in the end, the "Nanhai Dragon King" may have been moved by our spirit. The following submarine tests were very smooth. In the second long-range submarine experiment, the submersibles all worked for more than 31 hours until the energy consumption of the batteries reached. The valve submersible was set to float on the buoyant iron and the water was discharged, all the detection equipment was working properly, and the sea test was very successful.As the Chief of Staff with a particularly strong sense of responsibility, the pressure on the entire sea trial was the largest, so it would He was moved to tears at the South Asia Sea Trial Meeting in Sanya. At the meeting, Liu Jian thanked the leaders for their care and understanding during the sea trials. Force cooperation and close coordination is difficult to solve the problems we encountered an important spiritual pillar ", Zhang Jinhui said.

"AUV can realize tasks that can not be accomplished by the conventional ship-borne and towed investigation methods. Its advantages are reflected in the complete coverage of fine terrain near the bottom, high-precision magnetic survey near the bottom, three-dimensional distribution of hydrothermal plume and near-end HD photos. Shooting, etc., can provide scientists with high-precision marine exploration data to meet the needs of different scientific research. With the development of AUV technology, AUV reliability and application technology, and lower R&D costs, it is believed that multiple AUVs will be adopted soon. Underwater simultaneous operation mode, which will greatly improve the efficiency of AUV operations and survey costs, believes that AUV has much to do in the ocean survey and will play an important role in the detailed investigation of the 10,000 square kilometers of polymetallic sulphide contracted areas in the southwest Indian Ocean.”, Zhang Jinhui Confidence Say it full.

(Original Title: Breakthrough of Foreign Technology Blockade Independent R&D AUV Magnetometer)