Marine magnetism detection method and device

A marine magnetism detection device, comprising:

• a surveying ship,
• an onboard laboratory magnetism measurement portion arranged on the surveying ship,
• an aerostat shell and an aerostat magnetism measurement portion arranged inside the aerostat shell,
• wherein the aerostat shell is connected to the surveying ship via a rope, and the aerostat shell floats in air;
• the aerostat magnetism measurement portion comprises a magnetic sensor, an electronic magnetism data acquisition unit and an aerostat transmission unit;
• the onboard laboratory magnetism measurement portion comprises a data recording computer and a laboratory transmission unit;
• the magnetic sensor acquires marine magnetism and transmits a marine magnetism signal to the electronic magnetism data acquisition unit;
• the electronic magnetism data acquisition unit converts the marine magnetism signal into a digital signal and then transmits the digital signal to the aerostat transmission unit;
• the aerostat transmission unit transmits the digital signal to the laboratory transmission unit over a wireless or wired network and transmits a command, which is transmitted by the laboratory transmission unit and issued by the data recording computer, to the electronic magnetism data acquisition unit;
• and
• the laboratory transmission unit transmits the digital signal to the data recording computer and transmits a command issued by the data recording computer to the aerostat transmission unit over a wired or wireless network.