Background analysis:

Sea and water transportation are still one of the most important transportation methods at present, with large throughput and relatively cheap transportation prices. Therefore, the construction of a channel operation monitoring and early warning system is essential to the maintenance of the channel, water height, navigation mark, ship lock switch, section traffic, facility health, meteorological environment and other operational status monitoring and early warning. In particular, the topography of some waterways is complex, accompanied by heavy fog, haze, strong wind, heavy rain and other severe weather, and accidents will occur from time to time. On the evening of August 16, 2019, a ship from Hebei with 9 people capsized in the sea off Rizhao, Shandong. When the sunken ship was salvaged, 7 people were dead and 2 people lost contact. Common waterway monitoring methods include: remote sensing monitoring, video monitoring, sonar monitoring and other methods to record the on-site conditions of the waterway. Once an abnormal phenomenon such as navigation beacon status, ship navigation status, waterway blockage, etc. is found, an alarm message will be sent in time to provide important real-time data information for the smooth flow of the waterway and safe navigation. However, many of these monitoring methods will be disrupted under extreme weather conditions such as heavy rain, dense fog, heavy snow, etc., and may even not work normally. The use of Guochuang Micro-magnetic Basic Sensor Array can monitor the magnetic anomaly of the waterway. It can work normally under such harsh conditions.

 Product performance:

Since the composite Guochuang Micro-magnetic Basic Sensor detection array can monitor the ship's magnetic anomaly information and the flow information of the monitored waterway, the detection distance of ships can reach several hundred meters. Experiments have shown that the detection distance of a 30-ton tugboat is more than 200m, and the detection distance of a 50,000-ton cargo ship (without load) is more than 800m (Note: The measured data has not been processed with software algorithms. The measured distance will be longer after being processed). The magnetic anomaly detection array composed of micro-magnetic basic sensor with a resolution of 0.1nT can monitor the magnetic anomaly changes of the waterway not less than 0.1nT. The magnetic anomaly changes caused by the earthquake can generally reach tens of nT, and the magnetic anomaly is more obvious during the seism. So it can complete the task of waterway magnetic anomaly monitoring.

 Principle:

The magnetic anomaly target contains materials with ferromagnetic characteristics (such as iron, cobalt, nickel, etc.), and the magnetic field strength is inversely proportional to the target distance cube, H∝M/R3. We use Guochuang Micro-magnetic Basic Sensor Array to detect the magnetic anomaly information caused by the ferromagnetic target, and determine whether there is ferromagnetic target according to the corresponding model algorithm.

 Technical solution:

The array magnetic anomaly detection submarine cable composed of Guochuang Micro-magnetic Basic Sensor is adopted to monitor the magnetic anomaly of the waterway and the traffic of ships, and feed back to the maritime management department in time to facilitate unified dispatching management. Once the micro-magnetic basic sensor array submarine cable detects the waterway magnetic anomaly signal, the model algorithm will be used for analysis, and it can also determine whether there is geological anomaly (such as earthquake, etc.) in or near the waterway, and then send an early warning message to warn passing ships to modify the route, or suspend navigation to ensure the safety of passing ships.

   

 The main components of the system:

1. The waterway monitoring system is composed of micro-magnetic basic sensor array, communication module, digital signal unit, etc.;

2. The micro-magnetic basic sensor array is installed on the waterway monitoring buoy ;

3. Related algorithms include: micro-magnetic basic sensor array calibration, installation error calibration, carrier interference suppression, environmental noise suppression, processing of magnetic anomaly targets small signal, etc.;

4. Network data center: collection of data and information such as micro-magnetic basic sensor array data and magnetic anomaly early warning positioning signals;

5. Terminal console: display the working status and early warning information of the waterway monitoring system.