Magnetic field measurement water surface towed body and measurement method

Abstract

The invention provides a magnetic field measurement water surface towed body and a measurement method. A main body structure of the towed body comprises a bow section, an electronic cabin section, a measurement cabin section and a stern section from front to back; the bow section is provided with a force bearing interface and a power supply communication interface; the electronic cabin section and the measurement cabin section are watertight cabins, and a high-precision attitude measurement module, a data acquisition and transmission system and a magnetic field measurement electronic unit are mounted in the electronic cabin section; a magnetic field measurement sensor probe is mounted in the measurement cabin section; the stern section is provided with a vertical stabilizing plate and a horizontal wing; the upper side of the bow section and the upper side of the stern section of the towed body are each provided with an antenna module, and the lower side of the bow section and the lower side of the stern section are each provided with a non-magnetic balancing weight. The magnetic field measurement sensor probe, the electronic cabin, the antenna module and other key components are reasonably arranged and isolated through the measurement method, interference of the towed body on magnetic field measurement is effectively reduced, and the accuracy of measured data is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of ocean detection equipment, and in particular relates to a magnetic field measurement water surface towed body and a measurement method. Background Art

[0002] Ocean exploration technology has a wide range of applications in the civilian field. In particular, in recent years, people's understanding of the ocean has been further deepened, and ocean exploration equipment has emerged in an endless stream. Marine geomagnetic measurement is an extremely important means of ocean exploration. It is mainly used for target detection, magnetic field detection, geomagnetic matching navigation, etc. At present, there are few equipment products that can achieve large-scale and high-precision measurements, and their applications are relatively limited.

[0003] The commonly used towed marine magnetometer is towed by a test ship for navigation and measurement. Currently, it is impossible to accurately locate the exact position of the magnetometer measurement point. The towed gravity and magnetic measurement tow body used for marine survey has the function of geomagnetic measurement. It usually adopts a split structure to reduce the magnetic interference of the platform. It is also impossible to accurately locate the exact position of the magnetometer measurement point in underwater deep-sea scenes. In addition, the total field sensor currently used has some measurement limitations on the heading due to the measurement dead zone problem, and cannot accurately obtain all geomagnetic information. Summary of the invention

[0004] In view of this, the present invention provides a magnetic field measurement surface towed body, the main structure of which includes a bow section, an electronic compartment, a measuring compartment and a stern section from front to rear; the bow section is provided with a load-bearing interface and a power supply and communication interface; the electronic compartment and the measuring compartment are watertight compartments, and a high-precision attitude measurement module, a data acquisition and transmission system and a magnetic field measurement electronic unit are installed in the electronic compartment; a magnetic field measurement sensor probe is installed in the measuring compartment; the stern section is provided with a vertical stabilizing plate and a horizontal wing; antenna modules are installed on the upper side of the bow section and the upper side of the stern section of the towed body, and non-magnetic counterweights are installed on the lower side of the bow section and the lower side of the stern section.

[0005] In particular, the magnetic field measurement sensor probe includes a fluxgate sensor probe and an optical pump sensor probe, and the measurement compartment is sequentially installed with a first fluxgate probe, a first optical pump probe, a second fluxgate probe, and a second optical pump probe from front to back.

[0006] In particular, a certain distance is maintained between the first fluxgate probe and the electronic cabin, between the first fluxgate probe and the first optical pumping probe, between the first optical pumping probe and the second fluxgate probe, and between the second fluxgate probe and the second optical pumping probe to avoid mutual interference.

[0007] In particular, the antenna module includes an antenna on the upper side of the bow section and an antenna on the upper side of the stern section, and the two groups of antennas form a differential structure for accurately locating the position and heading of the towed body.

[0008] The present invention also discloses a method for measuring magnetic field of a towed body on a water surface, the steps of which include: measuring a first total magnetic field and a second total magnetic field respectively by a first optical pumping probe and a second optical pumping probe; measuring a first magnetic vector field and a second magnetic vector field respectively by a first fluxgate probe and a second fluxgate probe; measuring first position information and second position information respectively by an antenna on the upper side of a bow section and an antenna on the upper side of a stern section;

[0009] Differential processing is performed on the data of the first magnetic vector field and the second magnetic vector field and the first total magnetic field and the second total magnetic field, as well as the first position data and the second position data measured by the antenna to obtain high-precision target magnetic field measurement data.

[0010] Beneficial effects:

[0011] Through the magnetic field measurement surface towed body structure design of the present invention, key components such as the magnetic field measurement sensor probe, electronic cabin, antenna module, etc. are reasonably arranged and isolated, effectively reducing the interference of the towed body on the magnetic field measurement and improving the accuracy of the measurement data.

[0012] By installing a combination of a fluxgate sensor probe and an optical pump sensor probe in the measurement compartment of the present invention, synchronous measurement of the total magnetic field and the magnetic vector field is achieved, and more abundant magnetic field data information is obtained.

[0013] By arranging antenna modules on the upper sides of the bow section and the stern section respectively, the differential structure is used to accurately locate the position and heading of the towed body in real time, thus providing a guarantee for the accurate correspondence between the magnetic field measurement data and the position.

[0014] The measurement method of the present invention for performing differential processing based on multi-sensor measurement data and position information can effectively eliminate environmental interference, improve measurement accuracy, and simultaneously achieve high-efficiency, long-term, and large-scale magnetic field measurement of different sea locations.

[0015] The present invention adopts non-magnetic aluminum alloy or composite material to manufacture the towing body, which has high structural strength and certain pressure bearing capacity during towing, and can meet various working conditions of ocean magnetic field measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The overall structure diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of installing the magnetic sensor probe of the present invention. DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0019] The present invention provides a magnetic field measurement water surface towed body, such as Figure 1As shown, the main structure of the towing body includes a bow section 1, an electronic compartment section 2, a measurement compartment section 3 and a stern section 4 from front to back; the bow section 1 is provided with a load-bearing interface and a power supply and communication interface;

[0020] The electronic compartment 2 and the measuring compartment 3 are watertight compartments, and a high-precision attitude measurement module, a data acquisition and transmission system and a magnetic field measurement electronic unit are installed in the electronic compartment 2; a magnetic field measurement sensor probe is installed in the measuring compartment 3; the stern section 4 is provided with a vertical stabilization plate and a horizontal wing; antenna modules are installed on the upper side of the bow section 1 and the upper side of the stern section 2 of the towed body, and non-magnetic counterweights are installed on the lower side of the bow section 1 and the lower side of the stern section 4.

[0021] The magnetic field measurement sensor probe includes a fluxgate sensor probe and an optical pump sensor probe. The measurement compartment 3 is installed with a first fluxgate sensor probe 33, a first optical pump sensor probe 34, a second fluxgate sensor probe 35, and a second optical pump sensor probe 36 from front to back, and a certain distance is maintained between them to avoid mutual interference.

[0022] The antenna module includes an antenna on the upper side of the bow section 1 and an antenna on the upper side of the stern section 4. The two groups of antennas form a differential structure for accurately locating the position and heading of the towed body.

[0023] The purpose of the present invention is to propose a magnetic field measurement water surface towing body and measurement method. The water surface towing body adopts two sets of dead zone free optical pump sensor probes, two sets of fluxgate sensor probes, and two sets of positioning antennas. The dual sensors form data backup and form differential or gradient measurement at the same time to improve the measurement data level. Combined with the real-time positioning function of the surface antenna, the magnetic field and position relationship are accurately matched. At the same time, combined with the magnetic vector measurement of the fluxgate sensor, the towing body platform is compensated for magnetic interference, which meets the needs of marine geomagnetic measurement and has the advantages of high precision, real-time performance, and large-scale measurement.

[0024] The magnetic field measurement water surface towing body of the present invention has a main structure from front to back, including a bow section 1, an electronic compartment 2, a measuring compartment 3 and a stern section 4. The bow section 1 is equipped with a load-bearing interface and a power supply communication interface. The electronic compartment 2 and the measuring compartment 3 are watertight compartments. The electronic compartment is equipped with a high-precision attitude measurement module, a data acquisition and transmission system and a magnetic field measurement electronic unit. The measuring compartment 3 is equipped with a magnetic field measurement sensor probe. The stern section 4 is equipped with a vertical stabilizing plate and a horizontal wing. The antenna module is installed on the upper side of the bow section 1 and the upper side of the stern section 4 of the towing body, and the non-magnetic counterweight is installed on the lower side of the bow section 1 and the lower side of the stern section 4 of the towing body. A lifting ring is installed on the upper side of the middle part of the towing body.

[0025] The bow section 1, electronic compartment section 2, measurement compartment section 3, and stern section 4 of the present invention are made of non-magnetic aluminum alloy or composite material, have high structural strength, meet the towing requirements and have a certain pressure bearing capacity. The compartment sections are all integral structures, and limit bayonets are designed between the sections. Each section is connected in turn on the circumference by bolts.

[0026] The load-bearing interface of the present invention is installed in the middle of the upper side of the bow section 1. It is a fixed interface for the load-bearing towing cable to be installed on the towing body. The structural strength meets the towing requirements. At the same time, the load-bearing interface is arranged in the center to ensure that there is no torque in the horizontal direction when the towing body is subjected to force, and the towing body does not roll over. There are adjustable installation holes on the load-bearing interface. Before the surface towing test, the installation position of the load-bearing joint, the angle of the horizontal wing and the counterweight are adjusted to meet the attitude control at different towing speeds.

[0027] The electronic compartment 2 described in the present invention is equipped with a power supply module, a data transmission module, a high-precision attitude sensor, an optical pump electronic unit, a magnetic field data acquisition module, a control module, etc., among which the power supply module and other components with large magnetic field interference (measurement) are installed at the farthest end from the probe, and the wiring in the cabin and the connecting line of the antenna module on the upper side of the stern section 4 are installed away from the probe.

[0028] The antenna modules of the present invention are respectively installed on the upper side of the bow section 1 and the upper side of the stern section 4 of the towing body. The two sets of antennas form a differential structure to accurately locate the position and heading of the towing body. The antenna module can receive real-time position data information such as Beidou and GPS. The antenna module is installed at a certain height from the towing body through a support rod, and the height is sufficient for the antenna to be exposed above the water when the towing body is sailing normally.

[0029] A method for measuring magnetic field of a towed body on a water surface comprises the following steps: a first optical pumping probe and a second optical pumping probe respectively measure a first total magnetic field and a second total magnetic field;

[0030] The first fluxgate probe and the second fluxgate probe measure a first magnetic vector field and a second magnetic vector field respectively;

[0031] The first position information and the second position information are measured respectively by the upper antenna of the bow section 1 and the upper antenna of the stern section 4;

[0032] Differential processing is performed on the data of the first magnetic vector field and the second magnetic vector field and the first total magnetic field and the second total magnetic field, as well as the first position data and the second position data measured by the antenna to obtain high-precision target magnetic field measurement data.

[0033] The measuring method of the present invention is as follows: Figure 2As shown, the first optical pump sensor probe 34 and the second optical pump sensor probe 36 respectively measure the total magnetic field BT1 and BT2 at a certain place on the sea surface, the first fluxgate sensor probe 33 and the second fluxgate sensor probe 35 respectively measure the magnetic vector field (Bx1, By1, Bz1) and (Bx2, By2, Bz2), the first and second antenna modules respectively measure the position information (E1, N1, H1) and (E2, N2, H2), and multiple sets of sensors form data backup, reduce abnormal factors in sensor testing, and synchronously measure the total magnetic field information and magnetic vector information at different sea locations, and obtain high-precision target information through differential.

[0034] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0035] It is obvious to those skilled in the art that the embodiments of the present invention are not limited to the details of the above exemplary embodiments, and that the embodiments of the present invention can be implemented in other specific forms without departing from the spirit or basic features of the embodiments of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the embodiments of the present invention is limited by the attached claims rather than the above description, so it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the embodiments of the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved. In addition, it is obvious that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units, modules or devices stated in the system, device or terminal claims can also be implemented by the same unit, module or device through software or hardware. The words first, second, etc. are used to indicate names, and do not indicate any particular order.

[0036] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the embodiments of the present invention and are not intended to limit them. Although the embodiments of the present invention have been described in detail with reference to the above preferred implementation modes, those skilled in the art should understand that the technical solutions of the embodiments of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A magnetic field measurement water surface towed body, characterized in that: The main structure of the towing body includes a bow section, an electronic compartment, a measuring compartment and a stern section from front to back; the bow section is provided with a load-bearing interface and a power supply and communication interface; the electronic compartment and the measuring compartment are watertight compartments, and a high-precision attitude measurement module, a data acquisition and transmission system and a magnetic field measurement electronic unit are installed in the electronic compartment; a magnetic field measurement sensor probe is installed in the measuring compartment; the stern section is provided with a vertical stabilization plate and a horizontal wing; antenna modules are installed on the upper sides of the bow section and the stern section of the towing body, and non-magnetic counterweights are installed on the lower sides of the bow section and the stern section.

2. The magnetic field measurement water surface towed body according to claim 1, characterized in that: The magnetic field measurement sensor probe comprises a fluxgate sensor probe and an optical pump sensor probe, and the measurement compartment is sequentially equipped with a first fluxgate probe, a first optical pump probe, a second fluxgate probe, and a second optical pump probe from front to back.

3. The magnetic field measurement water surface towed body according to claim 2, characterized in that: A certain distance is maintained between the first fluxgate probe and the electronic cabin, between the first fluxgate probe and the first optical pump probe, between the first optical pump probe and the second fluxgate probe, and between the second fluxgate probe and the second optical pump probe to avoid mutual interference.

4. The magnetic field measurement water surface towed body according to any one of claims 1 to 3, characterized in that: The antenna module includes an antenna on the upper side of the bow section and an antenna on the upper side of the stern section. The two groups of antennas form a differential structure for accurately locating the position and heading of the towed body.

5. A method for measuring magnetic field using the magnetic field measurement water surface towed body according to any one of claims 1 to 4, the steps comprising: The first optical pumping probe and the second optical pumping probe measure the first total magnetic field and the second total magnetic field respectively; The first fluxgate probe and the second fluxgate probe measure a first magnetic vector field and a second magnetic vector field respectively; The first position information and the second position information are measured respectively by the antenna on the upper side of the bow section and the antenna on the upper side of the stern section; Differential processing is performed on the data of the first magnetic vector field and the second magnetic vector field and the first total magnetic field and the second total magnetic field, as well as the first position data and the second position data measured by the antenna to obtain high-precision target magnetic field measurement data.

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