Shipborne paleomagnetic laboratory shielding performance detection method and system

Abstract

The invention discloses a method and a system for detecting shielding performance of a shipborne paleomagnetic laboratory, and relates to the technical field of paleomagnetic laboratory detection. According to the invention, a plurality of measurement points are arranged in the shipborne paleomagnetic laboratory, so that the magnetic induction intensity data in the shipborne paleomagnetic laboratory can be accurately and fully measured, and the accuracy of subsequent calculation of the internal average residual magnetism and the shielding coefficient of the shipborne paleomagnetic laboratory is improved; the detection accuracy of the shielding performance of the shipborne paleomagnetic laboratory is further improved; the ship navigation state of the ship is continuously adjusted, the operation environment of the shipborne paleomagnetic laboratory is fully considered, and the situation that the shielding performance of the shipborne paleomagnetic laboratory is detected inaccurately due to the navigation uncertainty of the ship and the complex magnetic environment of the ship navigating in the ocean is avoided in a multi-ship navigation state and multi-measurement-point mode. The accuracy of the internal average residual magnetism and the shielding coefficient is improved through the dynamic characteristics of the ship, and the detection accuracy of the shielding performance of the shipborne paleomagnetic laboratory is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of paleomagnetic laboratory detection, and in particular relates to a method and system for detecting shielding performance of a ship-borne paleomagnetic laboratory. Background Art

[0002] As the key carrier of paleomagnetic research, the shielding performance of the paleomagnetic laboratory has a key impact on the accuracy and efficiency of paleomagnetic research. With the continuous deepening of marine paleomagnetic research, the importance of marine paleomagnetic research in the fields of marine resource exploration, geological disaster detection, climate change, etc. has become increasingly prominent. At the same time, traditional terrestrial paleomagnetic laboratories are limited by high sample calculation costs and poor timeliness, and cannot meet the needs of marine scientific research. Therefore, most of the current marine paleomagnetic research is carried out through ship-borne paleomagnetic laboratories. The shielding performance of ship-borne paleomagnetic laboratories is crucial for marine paleomagnetic research.

[0003] The shipboard paleomagnetic laboratory provides a near-zero-magnetic experimental environment through a magnetic shielding room, thereby ensuring that magnetic equipment such as superconducting magnetometers used in shipboard paleomagnetic experiments can operate normally and ensuring that the processed samples are not magnetized. Therefore, the detection of the shielding performance of the shipboard paleomagnetic laboratory is based on the detection of the key equipment, the magnetic shielding room. On this basis, the current detection of the shielding performance of the shipboard paleomagnetic laboratory is usually based on the detection method of the land paleomagnetic laboratory. However, due to the uncertainty of the navigation of the ship and the complex magnetic environment of the ship sailing in the ocean, the existing method for detecting the shielding performance of the land paleomagnetic laboratory has led to inaccurate detection of the shielding performance of the shipboard paleomagnetic laboratory, which in turn affects the research of marine paleomagnetism. Therefore, there is an urgent need for a method and system for detecting the shielding performance of a shipboard paleomagnetic laboratory to solve the defects of the prior art. Summary of the invention

[0004] The present invention aims to provide a method and system for detecting the shielding performance of a shipborne paleomagnetic laboratory to solve the above-mentioned technical problems. The internal average remanent magnetism of the shipborne paleomagnetic laboratory under different ship navigation states is measured at multiple measuring points, thereby improving the detection accuracy of the shielding performance of the shipborne paleomagnetic laboratory.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a method for detecting shielding performance of a shipborne paleomagnetic laboratory, comprising:

[0006] Obtain several measurement points of the magnetic shielding room and several ship navigation states;

[0007] Adjusting the ship's navigation state, and obtaining a first magnetic induction intensity value of each measuring point under each ship's navigation state based on a preset magnetic induction intensity measurement method, and determining the internal average remanent magnetism of the ship-borne paleomagnetic laboratory under each ship's navigation state;

[0008] Determining the shielding coefficient of the shipborne paleomagnetic laboratory under each ship's navigation state according to the internal average remanent magnetism of the shipborne paleomagnetic laboratory under each ship's navigation state;

[0009] The shielding performance of the shipborne paleomagnetic laboratory is determined according to the internal average remanent magnetism and shielding coefficient of the shipborne paleomagnetic laboratory under each ship navigation state.

[0010] It can be understood that, compared with the prior art, the present invention sets multiple measurement points in the shipboard paleomagnetic laboratory, continuously adjusts the ship's navigation state, obtains the first magnetic induction intensity value of each measurement point in each ship's navigation state, and then determines the internal average remanent magnetism and shielding coefficient of the shipboard paleomagnetic laboratory in each ship's navigation state, and realizes the detection of the shielding performance of the shipboard paleomagnetic laboratory based on the internal average remanent magnetism and shielding coefficient. The present invention can accurately and fully measure the magnetic induction intensity data in the ship-borne paleomagnetic laboratory by setting a plurality of measuring points in the ship-borne paleomagnetic laboratory, thereby improving the subsequent calculation accuracy of the internal average remanent magnetism and the shielding coefficient of the ship-borne paleomagnetic laboratory, and further improving the detection accuracy of the shielding performance of the ship-borne paleomagnetic laboratory; by continuously adjusting the ship's navigation state, fully considering the operating environment of the ship-borne paleomagnetic laboratory, and using multiple ship states and multiple measuring points, the inaccurate detection of the shielding performance of the ship-borne paleomagnetic laboratory caused by the uncertainty of the ship's navigation and the complex magnetic environment of the ship sailing in the ocean is avoided, the accuracy of the internal average remanent magnetism and the shielding coefficient is improved by the dynamic characteristics of the ship, and the detection accuracy of the shielding performance of the ship-borne paleomagnetic laboratory is ensured.

[0011] As a preferred solution, the adjusting the ship's navigation state, and obtaining the first magnetic induction intensity value of each measuring point under each ship's navigation state based on a preset magnetic induction intensity measurement method, and determining the internal average remanent magnetism of the ship-borne paleomagnetic laboratory under each ship's navigation state, specifically includes:

[0012] Constructing a spatial coordinate system of the magnetic shielding room;

[0013] Adjusting the ship's navigation state, and obtaining a first magnetic induction intensity value of each measuring point under each ship's navigation state according to the spatial coordinate system;

[0014] The first magnetic induction intensity value is calculated according to a preset arithmetic mean value algorithm to determine the internal average remanent magnetism of the ship-borne paleomagnetic laboratory under each ship navigation state.

[0015] This preferred solution improves the measurement accuracy of the measurement points by constructing a spatial coordinate system for the shipborne paleomagnetic laboratory and using the spatial coordinate system to refine the magnetic induction intensity values ​​measured at the measurement points. It also fully considers the operating environment of the shipborne paleomagnetic laboratory by continuously adjusting the ship's navigation state, and improves the accuracy of the internal average remanent magnetism and shielding coefficient by using multiple ship states and multiple measurement points, thereby ensuring the detection accuracy of the shielding performance of the shipborne paleomagnetic laboratory.

[0016] As a preferred solution, the adjusting the ship navigation state of the ship and obtaining the first magnetic induction intensity value of each measuring point under each ship navigation state according to the spatial coordinate system specifically includes:

[0017] The spatial coordinate system includes several coordinate axis directions;

[0018] The ship's navigation state is adjusted in sequence, and a positive magnetic induction intensity value and a negative magnetic induction intensity value of each measuring point in the coordinate axis direction under the current ship's navigation state are obtained;

[0019] Calculate a second magnetic induction intensity value of each measuring point according to the positive magnetic induction intensity value and the negative magnetic induction intensity value;

[0020] The second magnetic induction intensity values ​​are summed to determine the first magnetic induction intensity value of each measuring point under each ship navigation state.

[0021] This preferred solution refines the magnetic induction intensity values ​​measured at the measuring points through the coordinate axis directions of the spatial coordinate system, thereby improving the measurement accuracy of the measuring points. It also fully considers the operating environment of the shipborne paleomagnetic laboratory by continuously adjusting the ship's navigation state, thereby avoiding inaccurate detection of the shielding performance of the shipborne paleomagnetic laboratory due to the uncertainty of the ship's navigation and the complex magnetic environment of the ship sailing in the ocean, thereby ensuring the accuracy of the detection of the shielding performance of the shipborne paleomagnetic laboratory.

[0022] As a preferred solution, the shielding coefficient of the shipborne paleomagnetic laboratory under each ship's navigation state is determined according to the internal average remanent magnetism of the shipborne paleomagnetic laboratory under each ship's navigation state, specifically including:

[0023] Obtaining the external magnetic induction intensity value of the ship-borne paleomagnetic laboratory;

[0024] The shielding coefficient of the shipborne paleomagnetic laboratory under each ship navigation state is determined according to the internal average remanent magnetization and external magnetic induction intensity values ​​of the shipborne paleomagnetic laboratory under each ship navigation state.

[0025] As a preferred solution, the shielding coefficient of the shipborne paleomagnetic laboratory under each ship's navigation state is determined according to the internal average remanent magnetization and external magnetic induction intensity value of the shipborne paleomagnetic laboratory under each ship's navigation state, specifically including:

[0026] The calculation formula of the shielding coefficient includes:

[0027]

[0028] Among them, S is the shielding coefficient, B0 is the external magnetic induction intensity value of the shipborne paleomagnetic laboratory, and B m is the internal average remanent magnetization of the shipboard paleomagnetic laboratory.

[0029] This preferred scheme determines the shielding coefficient through the external magnetic induction intensity value and the internal average remanent magnetism of the shipborne paleomagnetic laboratory. The shielding coefficient is integrated with the external environmental data of the shipborne paleomagnetic laboratory through the external magnetic induction intensity value of the shipborne paleomagnetic laboratory, so that the shielding coefficient can more accurately express the shielding performance of the shipborne paleomagnetic laboratory under the external environmental data, thereby improving the detection accuracy of the shielding performance of the shipborne paleomagnetic laboratory.

[0030] As a preferred solution, the shielding performance of the shipborne paleomagnetic laboratory is determined according to the internal average remanent magnetism and shielding coefficient of the shipborne paleomagnetic laboratory under each ship navigation state, specifically including:

[0031] Obtain the internal average residual magnetism threshold and shielding coefficient threshold;

[0032] Determine whether the internal average remanent magnetism of the shipborne paleomagnetic laboratory under each ship navigation state is less than the internal average remanent magnetism threshold value, and obtain a first determination result;

[0033] Determine whether the shielding coefficient of the shipborne paleomagnetic laboratory under each ship navigation state is less than the shielding coefficient threshold, and obtain a second determination result;

[0034] The shielding performance of the shipborne paleomagnetic laboratory is determined according to the first judgment result and the second judgment result.

[0035] This preferred scheme determines the shielding performance of the shipborne paleomagnetic laboratory by comparing the internal average remanent magnetism and shielding coefficient with the corresponding threshold value, explores the shielding performance of the shipborne paleomagnetic laboratory itself through the internal average remanent magnetism, and then explores the relationship between the shielding performance changes of the shipborne paleomagnetic laboratory itself and the external environment through the shielding coefficient. It fully considers the actual working characteristics of the shipborne paleomagnetic laboratory and improves the detection accuracy of the shielding performance of the shipborne paleomagnetic laboratory.

[0036] As a preferred solution, after obtaining several measurement points and several ship navigation states of the shipborne paleomagnetic laboratory, the method further includes:

[0037] The ship-borne paleomagnetic laboratory includes: a fluxgate sensor;

[0038] The shipborne paleomagnetic laboratory is demagnetized according to a preset demagnetization method, and the zero bias of the fluxgate sensor is calibrated.

[0039] This preferred solution ensures the accuracy of the first magnetic induction intensity value measured at the measuring point by demagnetizing the shipboard paleomagnetic laboratory and calibrating the zero bias of the fluxgate sensor, thereby improving the calculation accuracy of the internal average remanent magnetism and the shielding coefficient, and improving the detection accuracy of the shielding performance of the shipboard paleomagnetic laboratory.

[0040] Accordingly, an embodiment of the present invention provides a system for detecting shielding performance of a shipborne paleomagnetic laboratory, comprising: a measurement data acquisition module, an internal average remanent magnetism calculation module, a shielding coefficient calculation module and a shielding performance detection module;

[0041] Wherein, the measurement data acquisition module is used to acquire several measurement points of the magnetic shielding room and several ship navigation states;

[0042] The internal average remanent magnetism calculation module is used to adjust the ship's navigation state, and obtain the first magnetic induction intensity value of each measurement point under each ship's navigation state based on a preset magnetic induction intensity measurement method, and determine the internal average remanent magnetism of the ship-borne paleomagnetic laboratory under each ship's navigation state;

[0043] The shielding coefficient calculation module is used to determine the shielding coefficient of the ship-borne paleomagnetic laboratory under each ship navigation state according to the internal average remanent magnetism of the ship-borne paleomagnetic laboratory under each ship navigation state;

[0044] The shielding performance detection module is used to determine the shielding performance of the ship-borne paleomagnetic laboratory according to the internal average remanent magnetism and shielding coefficient of the ship-borne paleomagnetic laboratory under each ship navigation state.

[0045] As a preferred solution, the internal average remanence calculation module includes: an internal average remanence calculation unit;

[0046] The internal average residual magnetism calculation unit is used to construct the spatial coordinate system of the magnetic shielding room;

[0047] Adjusting the ship's navigation state, and obtaining a first magnetic induction intensity value of each measuring point under each ship's navigation state according to the spatial coordinate system;

[0048] The first magnetic induction intensity value is calculated according to a preset arithmetic mean value algorithm to determine the internal average remanent magnetism of the ship-borne paleomagnetic laboratory under each ship navigation state.

[0049] As a preferred solution, the internal average residual magnetism calculation unit includes: a measurement point magnetic induction intensity value calculation subunit;

[0050] In the measuring point magnetic induction intensity value calculation subunit, the spatial coordinate system includes several coordinate axis directions;

[0051] The measuring point magnetic induction intensity value calculation subunit is used to adjust the ship's navigation state in sequence, and obtain the positive magnetic induction intensity value and the negative magnetic induction intensity value of each measuring point in the coordinate axis direction under the current ship's navigation state;

[0052] Calculate a second magnetic induction intensity value of each measuring point according to the positive magnetic induction intensity value and the negative magnetic induction intensity value;

[0053] The second magnetic induction intensity values ​​are summed to determine the first magnetic induction intensity value of each measuring point under each ship navigation state.

[0054] It can be understood that, compared with the existing technology, this system sets up multiple measurement points in the shipboard paleomagnetic laboratory, continuously adjusts the ship's navigation state, obtains the first magnetic induction intensity value of each measurement point in each ship's navigation state, and then determines the internal average remanent magnetism and shielding coefficient of the shipboard paleomagnetic laboratory in each ship's navigation state, and realizes the detection of the shielding performance of the shipboard paleomagnetic laboratory based on the internal average remanent magnetism and shielding coefficient. By setting up multiple measurement points in the shipboard paleomagnetic laboratory, this system can accurately and fully measure the magnetic induction intensity data in the shipboard paleomagnetic laboratory, thereby improving the subsequent calculation accuracy of the internal average remanent magnetism and shielding coefficient of the shipboard paleomagnetic laboratory, and thus improving the detection accuracy of the shielding performance of the shipboard paleomagnetic laboratory; by constantly adjusting the ship's navigation state, fully considering the operating environment of the shipboard paleomagnetic laboratory, and using multiple ship states and multiple measurement points, the inaccurate detection of the shielding performance of the shipboard paleomagnetic laboratory caused by the uncertainty of the ship's navigation and the complex magnetic environment of the ship sailing in the ocean is avoided, and the accuracy of the internal average remanent magnetism and shielding coefficient is improved by the dynamic characteristics of the ship, ensuring the detection accuracy of the shielding performance of the shipboard paleomagnetic laboratory. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 : A flow chart of the steps of a method for detecting shielding performance of a ship-borne paleomagnetic laboratory provided by an embodiment of the present invention;

[0056] Figure 2 : A schematic diagram of measurement point distribution of a magnetic shielding room provided by an embodiment of the present invention;

[0057] Figure 3 : A schematic diagram of measurement point distribution of another magnetic shielding room provided by an embodiment of the present invention;

[0058] Figure 4 : A schematic diagram of a ship navigation state provided by an embodiment of the present invention;

[0059] Figure 5 : A schematic diagram of a process for detecting shielding performance of a shipborne paleomagnetic laboratory provided by an embodiment of the present invention;

[0060] Figure 6 : A schematic diagram of the structure of a detection system for shielding performance of a ship-borne paleomagnetic laboratory provided by an embodiment of the present invention;

[0061] Among them, 201: measurement data acquisition module; 202: internal average residual magnetism calculation module; 203: shielding coefficient calculation module; 204: shielding performance detection module; 301: measurement point; 302: magnetic shielding room; 303: central measurement base point; 304: ship. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] With the continuous deepening of research in the field of marine paleomagnetism, traditional land-based paleomagnetic laboratories are limited by problems such as high sample transportation costs and poor timeliness, and are currently unable to meet the needs of open-sea and deep-sea scientific expeditions. The importance of marine paleomagnetism research in the fields of earth plate tectonics, paleoenvironmental reconstruction, climate change, resource exploration, geological disasters, etc. is becoming increasingly prominent. Therefore, shipborne paleomagnetic laboratories have become key equipment in current marine paleomagnetism research, and their shielding performance has a profound impact on the development of marine paleomagnetism research. However, due to the dynamic characteristics of ships and the complex magnetic environment on board, the detection of the shielding performance of shipborne paleomagnetic laboratories has caused great obstacles. Therefore, there is an urgent need for a method and system for detecting the shielding performance of shipborne paleomagnetic laboratories to solve the defects of the existing technology.

[0064] Embodiment 1

[0065] It should be noted that the relevant information of the shipboard paleomagnetic laboratory and the testing environment are explained here. First of all, the shipboard paleomagnetic laboratory provides a near-zero-magnetic experimental environment through a magnetic shielding room, so as to ensure that magnetic equipment such as superconducting magnetometers used in paleomagnetic experiments can operate normally and ensure that the processed samples are not magnetized; among them, the shielding principle of the magnetic shielding room is based on the shielding effect of high magnetic permeability materials on the magnetic field, and the ultra-low magnetic space formed by the high magnetic permeability materials is used to achieve magnetic shielding. Therefore, for the detection of the shielding performance of the shipboard paleomagnetic laboratory, the focus is on detecting the shielding performance of the magnetic shielding room.

[0066] Secondly, this embodiment defines the detection conditions of the shielding performance of the ship-borne paleomagnetic laboratory through ambient temperature, relative humidity and interference magnetic field. Specifically, the ambient temperature is set between 10°C and 30°C, the relative humidity is set to no more than 80%; the interference magnetic field is set so that the surrounding environment interference magnetic field noise is no more than 10nT / Hz1 / 2@ (i.e., between 10Hz and 1kHz).

[0067] In addition, please refer to Table 1, which is a table of relevant information of a detection tool and equipment provided in an embodiment of the present invention. Specifically, the detection tools and equipment include fluxgate magnetic sensors, magnetic field transmission systems, alternating magnetic sensors, dynamic signal analyzers, digital multimeters and tape measures. The fluxgate sensor includes equipment such as a non-magnetic test stand, and its measurement range is 1nT to 300nT, with an allowable error limit of ±1nT; the magnetic field range of the magnetic field transmission system is 1μT to 100μT, the frequency range is 10Hz to 1kHz, the stability is 1%@30min, and the allowable error limit is ±1%; the magnetic field measurement range of the alternating magnetic sensor is 100fT to 100μT, the frequency range is 10Hz to 1kHz, and the maximum operating error of the conversion coefficient is ±5%; the voltage measurement range of the dynamic signal analyzer is ±10V, the operating frequency is 10Hz to 1kHz, and the maximum operating error of the power spectrum density is ±(10%U±10nV), which can be replaced by a data collector with spectrum analysis function. The measurement range of the digital multimeter is ±10V, and the allowable error limit is 1×10 -5 (k=2); the measuring range of the tape measure is 5m and the allowable error limit is Level II.

[0068] It should be noted that the relevant information of the detection tools and equipment described in Table 1 is a common configuration of those skilled in the art, so this embodiment will not go into detail here, and only provides relevant information.

[0069] Table 1

[0070]

[0071] Please refer to Figure 1 , which is a step flow chart of a method for detecting shielding performance of a ship-borne paleomagnetic laboratory provided in an embodiment of the present invention, including steps S101 to S104.

[0072] Step S101: Acquire several measurement points of the magnetic shielding room and several ship navigation states.

[0073] In an alternative embodiment, please refer to Figure 2 , is a schematic diagram of measurement point distribution of a magnetic shielding room provided by an embodiment of the present invention; Figure 2As shown, there is a magnetic shielding room 302 in the shipboard paleomagnetic laboratory. Taking the geometric center of the magnetic shielding room 302 as the central base point, several measuring points 301 are selected at the top, bottom, left, right, front and back respectively. The measuring points 301 are evenly distributed inside the magnetic shielding room 302, and the interval distance between each measuring point ranges from 0.2 to 1 m.

[0074] In an alternative embodiment, please refer to Figure 3 , is a schematic diagram of measurement point distribution of another magnetic shielding room provided in an embodiment of the present invention; Figure 3 As shown, when the number of laboratory equipment in the shipborne paleomagnetic laboratory is only one or is arranged centrally, the geometric center is used as the central measurement base point 303, and six measurement points 301 above, below, left, right, front and back from the central measurement base point 303 are selected respectively, and measurement is performed with these six measurement points 301 and the central measurement base point, wherein the distances between these six measurement points 301 and the central measurement base point 303 are equal, and the distances can be set to 0.2 to 1 m.

[0075] In this embodiment, after obtaining a plurality of measurement points and a plurality of ship navigation states of the shipborne paleomagnetic laboratory, the method further includes:

[0076] The ship-borne paleomagnetic laboratory includes: a fluxgate sensor;

[0077] The shipborne paleomagnetic laboratory is demagnetized according to a preset demagnetization method, and the zero bias of the fluxgate sensor is calibrated.

[0078] In an optional embodiment, when the magnetic shielding room is equipped with a demagnetization system, the magnetic shielding room is demagnetized according to the equipment manual of the magnetic shielding room; then, the zero bias of the fluxgate sensor is calibrated in the magnetic shielding room, and the probe of the calibrated fluxgate sensor is fixed on a non-magnetic measurement bracket. The sensitive area of ​​the probe needs to coincide with the measurement point position.

[0079] This embodiment ensures the accuracy of the first magnetic induction intensity value measured at the measuring point by demagnetizing the shipboard paleomagnetic laboratory and calibrating the zero bias of the fluxgate sensor, thereby improving the calculation accuracy of the internal average remanent magnetism and the shielding coefficient, and improving the detection accuracy of the shielding performance of the shipboard paleomagnetic laboratory.

[0080] Step S102: adjusting the ship's navigation state, and obtaining the first magnetic induction intensity value of each measuring point under each ship's navigation state based on a preset magnetic induction intensity measurement method, and determining the internal average remanent magnetism of the ship-borne paleomagnetic laboratory under each ship's navigation state.

[0081] In this embodiment, the adjusting the ship's navigation state, and obtaining the first magnetic induction intensity value of each measuring point under each ship's navigation state based on a preset magnetic induction intensity measurement method, and determining the internal average remanent magnetism of the ship-borne paleomagnetic laboratory under each ship's navigation state specifically include:

[0082] Constructing a spatial coordinate system of the magnetic shielding room;

[0083] Adjusting the ship's navigation state, and obtaining a first magnetic induction intensity value of each measuring point under each ship's navigation state according to the spatial coordinate system;

[0084] The first magnetic induction intensity value is calculated according to a preset arithmetic mean value algorithm to determine the internal average remanent magnetism of the ship-borne paleomagnetic laboratory under each ship navigation state.

[0085] This embodiment constructs a spatial coordinate system for the ship-borne paleomagnetic laboratory, and uses the spatial coordinate system to refine the magnetic induction intensity values ​​measured at the measuring points, thereby improving the measurement accuracy of the measuring points. It also fully considers the operating environment of the ship-borne paleomagnetic laboratory by continuously adjusting the ship's navigation state, and improves the accuracy of the internal average remanent magnetism and shielding coefficient by means of multiple ship states and multiple measurement points, thereby ensuring the detection accuracy of the shielding performance of the ship-borne paleomagnetic laboratory.

[0086] In this embodiment, adjusting the ship navigation state of the ship and obtaining the first magnetic induction intensity value of each measuring point under each ship navigation state according to the spatial coordinate system specifically includes:

[0087] The spatial coordinate system includes several coordinate axis directions;

[0088] The ship's navigation state is adjusted in sequence, and a positive magnetic induction intensity value and a negative magnetic induction intensity value of each measuring point in the coordinate axis direction under the current ship's navigation state are obtained;

[0089] Calculate a second magnetic induction intensity value of each measuring point according to the positive magnetic induction intensity value and the negative magnetic induction intensity value;

[0090] The second magnetic induction intensity values ​​are summed to determine the first magnetic induction intensity value of each measuring point under each ship navigation state.

[0091] This embodiment refines the magnetic induction intensity value measured at the measuring point through the coordinate axis direction of the spatial coordinate system, improves the measurement accuracy of the measuring point, and fully considers the operating environment of the ship-borne paleomagnetic laboratory by continuously adjusting the ship's navigation state, thereby avoiding inaccurate detection of the shielding performance of the ship-borne paleomagnetic laboratory due to the uncertainty of the ship's navigation and the complex magnetic environment of the ship sailing in the ocean, thereby ensuring the accuracy of the detection of the shielding performance of the ship-borne paleomagnetic laboratory.

[0092] In an alternative embodiment, please refer to Figure 4 , is a schematic diagram of a ship navigation state provided by an embodiment of the present invention, such as Figure 4 As shown, the ship's navigation states include eight directions: geomagnetic due north, 45° east of geomagnetic north, geomagnetic due east, 45° east of geomagnetic south, geomagnetic due south, 45° west of geomagnetic south, geomagnetic due west, and 45° west of geomagnetic north. By adjusting the direction of the ship's navigation state, the magnetic shielding room can be directed in different directions.

[0093] Specifically, the length direction or width direction of the magnetic shielding room 302 is defined as the X-axis, and the width direction or length direction relative to it is defined as the Y-axis (that is, when the length direction is the X-axis, the width direction is the Y-axis, and when the length direction is the Y-axis, the width direction is the X-axis), and the vertical height direction is defined as the Z-axis to construct the spatial coordinate system of the magnetic shielding room; then, as shown in Figure 4 As shown in the figure, first adjust the ship's navigation state and align the ship's direction with the geomagnetic true north direction (the allowable deviation range is ±2°). Then, at the measurement point, use the X, Y, and Z magnetic axes of the fluxgate sensor to align with the X, Y, and Z axes of the spatial coordinate system respectively, and record the magnetic induction intensity value B output by the fluxgate sensor at this time. xn , B yn , B zn As the forward magnetic induction intensity value, the fluxgate sensor is then fixed at the original measurement position and rotated 180° along the X, Y, and Z axes of the spatial coordinate system, and the magnetic induction intensity value B output by the fluxgate sensor is recorded. x Bias, B y Bias, B z Zero bias is taken as the negative magnetic induction intensity value.

[0094] Calculate the second magnetic induction value B of the measuring point according to the positive magnetic induction value and the negative magnetic induction value x , B y and B z ,Specifically, the calculation process is as follows:

[0095] B x =|B xn -B x Zero bias|,

[0096] B y =|B yn -B y Zero bias|,

[0097] B z =|B zn -B z Zero bias|,

[0098] Among them, B x is the magnetic induction intensity value of the measuring point in the X-axis direction, B yis the magnetic induction intensity value of the measuring point in the Y-axis direction, B z is the magnetic induction intensity value of the measuring point in the Z-axis direction, B xn is the positive magnetic induction intensity value of the measuring point in the X-axis direction, B xn is the positive magnetic induction intensity value of the measuring point in the X-axis direction, B x Zero bias is the negative magnetic induction intensity value of the measuring point in the X-axis direction, B yn is the positive magnetic induction intensity value of the measuring point in the Y-axis direction, B y Zero bias is the negative magnetic induction intensity value of the measuring point in the Y-axis direction, B zn is the positive magnetic induction intensity value of the measuring point in the Z-axis direction, B z Zero bias is the negative magnetic induction intensity value of the measuring point in the Z-axis direction.

[0099] For the second magnetic induction intensity value B x , B y and B z The sum is calculated to obtain the first magnetic induction intensity value of the measuring point downward from the geomagnetic north, where the second magnetic induction intensity value B x , B y and B z The formula for summing is: B n is the first magnetic induction intensity value.

[0100] After obtaining the first magnetic induction intensity value of the current measuring point, measure and calculate the first magnetic induction intensity values ​​of other measuring points in turn, and determine that the first magnetic induction intensity values ​​of each measuring point downward from the geomagnetic due north are B1, B2, B3...B n .

[0101] Then, the first magnetic induction intensity value is calculated according to a preset arithmetic mean value algorithm to determine the internal average remanent magnetism Bnorth of the shipborne paleomagnetic laboratory downward from the geomagnetic true north. The process of the preset arithmetic mean value algorithm in this embodiment is as follows:

[0102] After obtaining the internal average remanent magnetization Bnorth of the ship-borne paleomagnetic laboratory with the geomagnetic north pointing downward, the ship's navigation state was adjusted to 45° east of the geomagnetic north, and the measuring points were measured and calculated again to obtain the internal average remanent magnetization Bnortheast of the ship-borne paleomagnetic laboratory with the geomagnetic north pointing downward. Then, by analogy, the ship's navigation state was continuously adjusted to obtain the internal average remanent magnetization Beast, Bsoutheast, Bsouth, Bsouthwest, Bwest and Bnorthwest of the ship-borne paleomagnetic laboratory under the ship's navigation states of due east, 45° east of south, due south, 45° west of south, due west and 45° west of north.

[0103] It should be noted that B described in this embodiment xn , Byn , B zn , B x Bias, B y Bias, B z Bias, B x , B y , B z , BNorth, BNortheast, BEast, BSoutheast, BSouthwest, BWest, BNorthwest and B1, B2, B3…B n The unit is nT.

[0104] Step S103: determining the shielding coefficient of the shipborne paleomagnetic laboratory under each ship's navigation state according to the internal average remanent magnetism of the shipborne paleomagnetic laboratory under each ship's navigation state.

[0105] In this embodiment, the shielding coefficient of the shipborne paleomagnetic laboratory under each ship's navigation state is determined according to the internal average remanent magnetism of the shipborne paleomagnetic laboratory under each ship's navigation state, specifically including:

[0106] Obtaining the external magnetic induction intensity value of the ship-borne paleomagnetic laboratory;

[0107] The shielding coefficient of the shipborne paleomagnetic laboratory under each ship navigation state is determined according to the internal average remanent magnetization and external magnetic induction intensity values ​​of the shipborne paleomagnetic laboratory under each ship navigation state.

[0108] In this embodiment, the shielding coefficient of the shipborne paleomagnetic laboratory under each ship's navigation state is determined according to the internal average remanent magnetization and external magnetic induction intensity value of the shipborne paleomagnetic laboratory under each ship's navigation state, specifically including:

[0109] The calculation formula of the shielding coefficient includes:

[0110]

[0111] Among them, S is the shielding coefficient, B0 is the external magnetic induction intensity value of the shipborne paleomagnetic laboratory, and B m is the internal average remanent magnetization of the shipboard paleomagnetic laboratory.

[0112] It should be noted that the external magnetic induction intensity value of the ship-borne paleomagnetic laboratory can be obtained by mooring the ship at the dock and then measuring the magnetic induction intensity value B0 outside the ship-borne paleomagnetic laboratory; B0 and B m The unit of is nT; the unit of shielding coefficient S is dB.

[0113] In an optional embodiment, the internal average remanent magnetization of the shipborne paleomagnetic laboratory Bnorth, Bnortheast, Beast, Bsoutheast, Bsouth, Bsouthwest, Bwest and Bnorthwest are respectively substituted into the calculation formula of the shielding coefficient, replacing B m, and then the shielding coefficients of the shipborne paleomagnetic laboratory under each ship navigation state are calculated: Snorth, Snortheast, Seast, Ssoutheast, Ssouth, Ssouthwest, Swest and Snorthwest.

[0114] This embodiment determines the shielding coefficient through the external magnetic induction intensity value and the internal average remanent magnetism of the shipborne paleomagnetic laboratory. The shielding coefficient is integrated with the external environmental data of the shipborne paleomagnetic laboratory through the external magnetic induction intensity value of the shipborne paleomagnetic laboratory, so that the shielding coefficient can more accurately express the shielding performance of the shipborne paleomagnetic laboratory under the external environmental data, thereby improving the detection accuracy of the shielding performance of the shipborne paleomagnetic laboratory.

[0115] Step S104: Determine the shielding performance of the shipborne paleomagnetic laboratory according to the internal average remanent magnetism and shielding coefficient of the shipborne paleomagnetic laboratory under each ship navigation state.

[0116] In this embodiment, the shielding performance of the shipborne paleomagnetic laboratory is determined according to the internal average remanent magnetism and shielding coefficient of the shipborne paleomagnetic laboratory under each ship navigation state, specifically including:

[0117] Obtain the internal average residual magnetism threshold and shielding coefficient threshold;

[0118] Determine whether the internal average remanent magnetism of the shipborne paleomagnetic laboratory under each ship navigation state is less than the internal average remanent magnetism threshold value, and obtain a first determination result;

[0119] Determine whether the shielding coefficient of the shipborne paleomagnetic laboratory under each ship navigation state is less than the shielding coefficient threshold, and obtain a second determination result;

[0120] The shielding performance of the shipborne paleomagnetic laboratory is determined according to the first judgment result and the second judgment result.

[0121] In an optional embodiment, the internal average remanent magnetization threshold and the shielding coefficient threshold are experimentally calibrated by technicians, and then the internal average remanent magnetization Bnorth, Bnortheast, Beast, Bsoutheast, Bsouth, Bsouthwest, Bwest and Bnorthwest of the shipborne paleomagnetic laboratory are compared in sequence to see whether they are all less than the internal average remanent magnetization threshold, to obtain a first judgment result; the shielding coefficients Snorth, Snortheast, Seast, Ssouth, Ssouthwest, Swest and Snorthwest are compared in sequence to see whether they are all less than the shielding coefficient threshold, to obtain a second judgment result;

[0122] When the first judgment result is that the internal average remanent magnetization Bnorth, Bnortheast, Beast, Bsoutheast, Bsouth, Bsouthwest, Bwest and Bnorthwest are all less than the internal average remanent magnetization threshold, and the second judgment result is that the shielding coefficients Snorth, Snortheast, Seast, Ssouth, Ssouthwest, Swest and Snorthwest are all less than the shielding coefficient threshold, it is determined that the shielding performance of the shipborne paleomagnetic laboratory is qualified.

[0123] This embodiment determines the shielding performance of the shipborne paleomagnetic laboratory by comparing the internal average remanent magnetism and the shielding coefficient with the corresponding threshold value, explores the shielding performance of the shipborne paleomagnetic laboratory itself through the internal average remanent magnetism, and then explores the relationship between the shielding performance changes of the shipborne paleomagnetic laboratory itself and the external environment through the shielding coefficient. It fully considers the actual working characteristics of the shipborne paleomagnetic laboratory and improves the detection accuracy of the shielding performance of the shipborne paleomagnetic laboratory.

[0124] In an optional embodiment, after determining that the shielding performance of the shipborne paleomagnetic laboratory is qualified, the detection method of the land-based paleomagnetic laboratory is used to measure the magnetic field noise and magnetic field gradient of the shipborne paleomagnetic laboratory, and then evaluate the magnetic field noise value of the shipborne paleomagnetic laboratory, the uniformity of the residual magnetic field, and the stability of the magnetic field environment;

[0125] Specifically, a magnetometer can be used as a measuring device for magnetic field noise to collect magnetic field noise measurement data within a set time period, and a spectrum diagram of the magnetic field noise can be drawn, and the magnetic field noise level can be analyzed based on the spectrum diagram; a magnetic field gradient measuring device can be used to measure the magnetic field gradient data, and then the magnetic field intensity difference between different measuring points can be calculated to obtain specific data of the magnetic field gradient.

[0126] Since the measurement of magnetic field noise and magnetic field gradient has been widely used in terrestrial paleomagnetic laboratories, the detection of magnetic field noise and magnetic field gradient in ship-borne paleomagnetic laboratories can be achieved by those skilled in the art by referring to the detection methods of terrestrial paleomagnetic laboratories, and this embodiment will not be elaborated in detail here.

[0127] In an alternative embodiment, please refer to Figure 5 , which is a schematic diagram of a process for detecting shielding performance of a shipborne paleomagnetic laboratory provided by an embodiment of the present invention, such as Figure 5 As shown, firstly, measurement preparation is carried out, relevant measuring equipment and tools are prepared, and relevant parameters of the equipment and tools are modulated; then, the measuring points of the magnetic shielding room are selected, and the magnetic shielding room is demagnetized using the demagnetization system, and the zero bias of the fluxgate sensor is calibrated; then, the ship's navigation state is adjusted, and each point is measured, and the internal average remanent magnetism of the ship-borne paleomagnetic laboratory under different navigation states is calculated and determined, and then the shielding effectiveness of the ship-borne paleomagnetic laboratory is calculated, and other indicators of the ship-borne paleomagnetic laboratory are measured together, and finally the test results are output in the form of a test report.

[0128] This embodiment sets a plurality of measuring points in the shipboard paleomagnetic laboratory, and continuously adjusts the ship's navigation state, obtains the first magnetic induction intensity value of each measuring point in each ship's navigation state, and then determines the internal average remanence and shielding coefficient of the shipboard paleomagnetic laboratory in each ship's navigation state, and realizes the detection of the shielding performance of the shipboard paleomagnetic laboratory based on the internal average remanence and shielding coefficient. This embodiment sets a plurality of measuring points in the shipboard paleomagnetic laboratory, and can accurately and fully measure the magnetic induction intensity data in the shipboard paleomagnetic laboratory, thereby improving the subsequent calculation accuracy of the internal average remanence and shielding coefficient of the shipboard paleomagnetic laboratory, and then improving the detection accuracy of the shielding performance of the shipboard paleomagnetic laboratory; by continuously adjusting the ship's navigation state, fully considering the operating environment of the shipboard paleomagnetic laboratory, and in a multi-ship navigation state and multi-measurement point manner, the inaccurate detection of the shielding performance of the shipboard paleomagnetic laboratory caused by the uncertainty of the ship's navigation and the complex magnetic environment of the ship sailing in the ocean is avoided, and the accuracy of the internal average remanence and shielding coefficient is improved by the dynamic characteristics of the ship, ensuring the detection accuracy of the shielding performance of the shipboard paleomagnetic laboratory.

[0129] Embodiment 2

[0130] Please refer to Figure 6 , which is a structural schematic diagram of a ship-borne paleomagnetic laboratory shielding performance detection system provided by an embodiment of the present invention, including: a measurement data acquisition module 201, an internal average remanent magnetism calculation module 202, a shielding coefficient calculation module 203 and a shielding performance detection module 204.

[0131] The measurement data acquisition module 201 is used to acquire several measurement points of the magnetic shielding room and several ship navigation states.

[0132] The internal average residual magnetism calculation module 202 is used to adjust the ship's navigation state, and obtain the first magnetic induction intensity value of each measurement point under each ship's navigation state based on a preset magnetic induction intensity measurement method, and determine the internal average residual magnetism of the ship-borne paleomagnetic laboratory under each ship's navigation state.

[0133] In this embodiment, the internal average remanence calculation module 202 includes: an internal average remanence calculation unit;

[0134] The internal average residual magnetism calculation unit is used to construct the spatial coordinate system of the magnetic shielding room;

[0135] Adjusting the ship's navigation state, and obtaining a first magnetic induction intensity value of each measuring point under each ship's navigation state according to the spatial coordinate system;

[0136] The first magnetic induction intensity value is calculated according to a preset arithmetic mean value algorithm to determine the internal average remanent magnetism of the ship-borne paleomagnetic laboratory under each ship navigation state.

[0137] In this embodiment, the internal average residual magnetism calculation unit includes: a measurement point magnetic induction intensity value calculation subunit;

[0138] In the measuring point magnetic induction intensity value calculation subunit, the spatial coordinate system includes several coordinate axis directions;

[0139] The measuring point magnetic induction intensity value calculation subunit is used to adjust the ship's navigation state in sequence, and obtain the positive magnetic induction intensity value and the negative magnetic induction intensity value of each measuring point in the coordinate axis direction under the current ship's navigation state;

[0140] Calculate a second magnetic induction intensity value of each measuring point according to the positive magnetic induction intensity value and the negative magnetic induction intensity value;

[0141] The second magnetic induction intensity values ​​are summed to determine the first magnetic induction intensity value of each measuring point under each ship navigation state.

[0142] The shielding coefficient calculation module 203 is used to determine the shielding coefficient of the shipboard paleomagnetic laboratory under each ship navigation state according to the internal average remanent magnetism of the shipboard paleomagnetic laboratory under each ship navigation state.

[0143] In this embodiment, the shielding coefficient calculation module 203 includes: a shielding coefficient calculation unit;

[0144] The shielding coefficient calculation unit is used to obtain the external magnetic induction intensity value of the ship-borne paleomagnetic laboratory;

[0145] The shielding coefficient of the shipborne paleomagnetic laboratory under each ship navigation state is determined according to the internal average remanent magnetization and external magnetic induction intensity values ​​of the shipborne paleomagnetic laboratory under each ship navigation state.

[0146] In this embodiment, the shielding coefficient calculation unit includes: a shielding coefficient calculation subunit;

[0147] The shielding coefficient calculation subunit is used to determine the shielding coefficient of the shipborne paleomagnetic laboratory under each ship navigation state according to the internal average remanent magnetization and external magnetic induction intensity value of the shipborne paleomagnetic laboratory under each ship navigation state, wherein the calculation formula of the shielding coefficient includes:

[0148]

[0149] Among them, S is the shielding coefficient, B0 is the external magnetic induction intensity value of the shipborne paleomagnetic laboratory, and B m is the internal average remanent magnetization of the shipboard paleomagnetic laboratory.

[0150] The shielding performance detection module 204 is used to determine the shielding performance of the shipborne paleomagnetic laboratory according to the internal average remanent magnetism and shielding coefficient of the shipborne paleomagnetic laboratory under each ship navigation state.

[0151] In this embodiment, the shielding performance detection module 204 includes: a shielding performance detection unit;

[0152] The shielding performance detection is used to obtain the internal average residual magnetism threshold and the shielding coefficient threshold;

[0153] Determine whether the internal average remanent magnetism of the shipborne paleomagnetic laboratory under each ship navigation state is less than the internal average remanent magnetism threshold value, and obtain a first determination result;

[0154] Determine whether the shielding coefficient of the shipborne paleomagnetic laboratory under each ship navigation state is less than the shielding coefficient threshold, and obtain a second determination result;

[0155] The shielding performance of the shipborne paleomagnetic laboratory is determined according to the first judgment result and the second judgment result.

[0156] This embodiment sets a plurality of measuring points in the shipboard paleomagnetic laboratory, and continuously adjusts the ship's navigation state, obtains the first magnetic induction intensity value of each measuring point in each ship's navigation state, and then determines the internal average remanence and shielding coefficient of the shipboard paleomagnetic laboratory in each ship's navigation state, and realizes the detection of the shielding performance of the shipboard paleomagnetic laboratory based on the internal average remanence and shielding coefficient. This embodiment sets a plurality of measuring points in the shipboard paleomagnetic laboratory, and can accurately and fully measure the magnetic induction intensity data in the shipboard paleomagnetic laboratory, thereby improving the subsequent calculation accuracy of the internal average remanence and shielding coefficient of the shipboard paleomagnetic laboratory, and then improving the detection accuracy of the shielding performance of the shipboard paleomagnetic laboratory; by continuously adjusting the ship's navigation state, fully considering the operating environment of the shipboard paleomagnetic laboratory, and in a multi-ship navigation state and multi-measurement point manner, the inaccurate detection of the shielding performance of the shipboard paleomagnetic laboratory caused by the uncertainty of the ship's navigation and the complex magnetic environment of the ship sailing in the ocean is avoided, and the accuracy of the internal average remanence and shielding coefficient is improved by the dynamic characteristics of the ship, ensuring the detection accuracy of the shielding performance of the shipboard paleomagnetic laboratory.

[0157] To summarize, the embodiment of the present invention sets multiple measurement points in the shipboard paleomagnetic laboratory, continuously adjusts the ship's navigation state, obtains the first magnetic induction intensity value of each measurement point in each ship's navigation state, and further determines the internal average remanent magnetism and shielding coefficient of the shipboard paleomagnetic laboratory in each ship's navigation state, and realizes the detection of the shielding performance of the shipboard paleomagnetic laboratory based on the internal average remanent magnetism and shielding coefficient. The embodiment of the present invention can accurately and fully measure the magnetic induction intensity data in the shipboard paleomagnetic laboratory by setting multiple measurement points in the shipboard paleomagnetic laboratory, thereby improving the subsequent calculation accuracy of the internal average remanent magnetism and shielding coefficient of the shipboard paleomagnetic laboratory, and further improving the detection accuracy of the shielding performance of the shipboard paleomagnetic laboratory; by continuously adjusting the ship's navigation state, fully considering the operating environment of the shipboard paleomagnetic laboratory, and using multiple ship states and multiple measurement points, the inaccurate detection of the shielding performance of the shipboard paleomagnetic laboratory caused by the uncertainty of the ship's navigation and the complex magnetic environment of the ship sailing in the ocean is avoided, the dynamic characteristics of the ship are used to improve the accuracy of the internal average remanent magnetism and the shielding coefficient, and the detection accuracy of the shielding performance of the shipboard paleomagnetic laboratory is ensured.

[0158] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for detecting shielding performance of a ship-borne paleomagnetic laboratory, applicable to a ship including a ship-borne paleomagnetic laboratory, characterized in that: include: Obtain several measurement points of the magnetic shielding room and several ship navigation states; Adjusting the ship's navigation state, and obtaining a first magnetic induction intensity value of each measuring point under each ship's navigation state based on a preset magnetic induction intensity measurement method, and determining the internal average remanent magnetism of the ship-borne paleomagnetic laboratory under each ship's navigation state; Determining the shielding coefficient of the shipborne paleomagnetic laboratory under each ship's navigation state according to the internal average remanent magnetism of the shipborne paleomagnetic laboratory under each ship's navigation state; The shielding performance of the shipborne paleomagnetic laboratory is determined according to the internal average remanent magnetism and shielding coefficient of the shipborne paleomagnetic laboratory under each ship navigation state.

2. A method for detecting shielding performance of a shipborne paleomagnetic laboratory as claimed in claim 1, characterized in that: The adjusting the ship's navigation state, and obtaining the first magnetic induction intensity value of each measuring point under each ship's navigation state based on a preset magnetic induction intensity measurement method, and determining the internal average remanent magnetism of the ship-borne paleomagnetic laboratory under each ship's navigation state, specifically includes: Constructing a spatial coordinate system of the magnetic shielding room; Adjusting the ship's navigation state, and obtaining a first magnetic induction intensity value of each measuring point under each ship's navigation state according to the spatial coordinate system; The first magnetic induction intensity value is calculated according to a preset arithmetic mean value algorithm to determine the internal average remanent magnetism of the ship-borne paleomagnetic laboratory under each ship navigation state.

3. A method for detecting shielding performance of a shipborne paleomagnetic laboratory as claimed in claim 2, characterized in that: The adjusting the ship navigation state of the ship and obtaining the first magnetic induction intensity value of each measuring point under each ship navigation state according to the spatial coordinate system specifically includes: The spatial coordinate system includes several coordinate axis directions; The ship's navigation state is adjusted in sequence, and a positive magnetic induction intensity value and a negative magnetic induction intensity value of each measuring point in the coordinate axis direction under the current ship's navigation state are obtained; Calculate a second magnetic induction intensity value of each measuring point according to the positive magnetic induction intensity value and the negative magnetic induction intensity value; The second magnetic induction intensity values ​​are summed to determine the first magnetic induction intensity value of each measuring point under each ship navigation state.

4. A method for detecting shielding performance of a shipborne paleomagnetic laboratory as claimed in claim 1, characterized in that: Determining the shielding coefficient of the shipborne paleomagnetic laboratory under each ship's navigation state according to the internal average remanent magnetism of the shipborne paleomagnetic laboratory under each ship's navigation state specifically includes: Obtaining the external magnetic induction intensity value of the ship-borne paleomagnetic laboratory; The shielding coefficient of the shipborne paleomagnetic laboratory under each ship navigation state is determined according to the internal average remanent magnetization and external magnetic induction intensity values ​​of the shipborne paleomagnetic laboratory under each ship navigation state.

5. A method for detecting shielding performance of a shipborne paleomagnetic laboratory as claimed in claim 4, characterized in that: Determining the shielding coefficient of the shipborne paleomagnetic laboratory under each ship's navigation state according to the internal average remanent magnetization and external magnetic induction intensity value of the shipborne paleomagnetic laboratory under each ship's navigation state specifically includes: The calculation formula of the shielding coefficient includes: Among them, S is the shielding coefficient, B0 is the external magnetic induction intensity value of the shipborne paleomagnetic laboratory, and B m is the internal average remanent magnetization of the shipboard paleomagnetic laboratory.

6. A method for detecting shielding performance of a shipborne paleomagnetic laboratory as claimed in claim 1, characterized in that: Determining the shielding performance of the shipborne paleomagnetic laboratory according to the internal average remanent magnetism and shielding coefficient of the shipborne paleomagnetic laboratory under each ship navigation state specifically includes: Obtain the internal average residual magnetism threshold and shielding coefficient threshold; Determine whether the internal average remanent magnetism of the shipborne paleomagnetic laboratory under each ship navigation state is less than the internal average remanent magnetism threshold value, and obtain a first determination result; Determine whether the shielding coefficient of the shipborne paleomagnetic laboratory under each ship navigation state is less than the shielding coefficient threshold, and obtain a second determination result; The shielding performance of the shipborne paleomagnetic laboratory is determined according to the first judgment result and the second judgment result.

7. A method for detecting shielding performance of a shipborne paleomagnetic laboratory as claimed in claim 1, characterized in that: After obtaining a plurality of measurement points and a plurality of ship navigation states of the shipborne paleomagnetic laboratory, the method further includes: The ship-borne paleomagnetic laboratory includes: a fluxgate sensor; The shipborne paleomagnetic laboratory is demagnetized according to a preset demagnetization method, and the zero bias of the fluxgate sensor is calibrated.

8. A system for detecting shielding performance of a shipborne paleomagnetic laboratory, characterized in that: include: Measurement data acquisition module, internal average residual magnetism calculation module, shielding coefficient calculation module and shielding performance detection module; Wherein, the measurement data acquisition module is used to acquire several measurement points of the magnetic shielding room and several ship navigation states; The internal average remanent magnetism calculation module is used to adjust the ship's navigation state, and obtain the first magnetic induction intensity value of each measurement point under each ship's navigation state based on a preset magnetic induction intensity measurement method, and determine the internal average remanent magnetism of the ship-borne paleomagnetic laboratory under each ship's navigation state; The shielding coefficient calculation module is used to determine the shielding coefficient of the ship-borne paleomagnetic laboratory under each ship navigation state according to the internal average remanent magnetism of the ship-borne paleomagnetic laboratory under each ship navigation state; The shielding performance detection module is used to determine the shielding performance of the ship-borne paleomagnetic laboratory according to the internal average remanent magnetism and shielding coefficient of the ship-borne paleomagnetic laboratory under each ship navigation state.

9. A system for detecting shielding performance of a shipborne paleomagnetic laboratory as claimed in claim 8, characterized in that: The internal average remanence calculation module comprises: an internal average remanence calculation unit; The internal average residual magnetism calculation unit is used to construct the spatial coordinate system of the magnetic shielding room; Adjusting the ship's navigation state, and obtaining a first magnetic induction intensity value of each measuring point under each ship's navigation state according to the spatial coordinate system; The first magnetic induction intensity value is calculated according to a preset arithmetic mean value algorithm to determine the internal average remanent magnetism of the ship-borne paleomagnetic laboratory under each ship navigation state.

10. A system for detecting shielding performance of a shipborne paleomagnetic laboratory as claimed in claim 9, characterized in that: The internal average residual magnetism calculation unit includes: a measurement point magnetic induction intensity value calculation subunit; In the measuring point magnetic induction intensity value calculation subunit, the spatial coordinate system includes a number of coordinate axis directions; The measuring point magnetic induction intensity value calculation subunit is used to adjust the ship's navigation state in sequence, and obtain the positive magnetic induction intensity value and the negative magnetic induction intensity value of each measuring point in the coordinate axis direction under the current ship's navigation state; Calculate a second magnetic induction intensity value of each measuring point according to the positive magnetic induction intensity value and the negative magnetic induction intensity value; The second magnetic induction intensity values ​​are summed to determine the first magnetic induction intensity value of each measuring point under each ship navigation state.

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