A method and device for correcting underwater gravity and magnetic data

Abstract

An embodiment of the present application provides a method for correcting underwater gravity and magnetic data, which relates to the field of geological resource exploration. The method collects underwater gravity data and underwater magnetic data of a target point; calculates gravity correction data of the target point based on the underwater gravity data, wherein the gravity correction data includes a base point gravimeter reading correction value, a zero drift value, a measuring point zero drift correction value, an Erfahrenheit correction value, a tide correction value, and a gravity correction value; and calculates magnetic correction data of the target point based on the underwater magnetic data, wherein the magnetic correction data includes a carrier magnetic compensation correction value, a diurnal variation correction value, and a magnetic anomaly correction value. The method corrects various underwater gravity and magnetic data, provides technical support for the development and application of underwater gravity and magnetic exploration technology, and improves the exploration efficiency of underwater gravity and magnetic exploration technology.

Description

Technical Field

[0001] The present application relates to the field of geological resource exploration, and in particular to a method and device for correcting underwater gravity and magnetic data. Background Art

[0002] Gravity and magnetic data measurements in marine areas are typically taken aboard ships. Gravimeters and magnetometers are mounted on ships, and gravity and magnetic sensors are used to observe and record the Earth's gravitational and geomagnetic fields. Various corrections are then applied to the acquired gravity and magnetic data to determine gravity and magnetic anomalies in the study area, which are then used to address geological problems such as tectonic studies and energy exploration.

[0003] Conventional ship-based gravity and magnetic data correction technology calibrates data obtained from gravity and magnetic instruments installed on a ship. However, underwater towed gravity and magnetic measurements differ from ship-based measurements. Because both the gravimeter and magnetometer are mounted on a support at a certain depth underwater, towed measurements conducted by a ship are subject to dynamic changes in the spatial position of underwater gravity and magnetic observations due to waves and currents. The inherent magnetic fields of the ship, towed body, and cable affect magnetic field observations at the measurement points. Ocean tides, waves, and currents can also cause changes in the gravity and magnetic fields.

[0004] Therefore, the ship-based gravity and magnetic measurement data correction technology is not suitable for underwater measurement data. With the research and development of underwater gravity and magnetic measurement equipment in my country, underwater high-precision gravity and magnetic exploration has entered the experimental research stage. At present, there is an urgent need for a method that can accurately correct underwater gravity and magnetic measurement data. Summary of the Invention

[0005] In order to solve the above technical problems, the embodiments of the present application provide a method and device for correcting underwater gravity and magnetic data.

[0006] In a first aspect, an embodiment of the present application provides a method for correcting underwater gravity and magnetic data, the method comprising:

[0007] Collect underwater gravity data and underwater magnetic data of the test point;

[0008] Calculating gravity correction data of the measured point based on the underwater gravity data, wherein the gravity correction data includes a base point gravimeter reading correction value, a zero drift value, a point zero drift correction value, an erroneous correction value, a tidal correction value, and a gravity correction value;

[0009] Magnetic correction data of the point to be measured is calculated based on the underwater magnetic data, wherein the magnetic correction data includes a carrier magnetic compensation correction value, a diurnal variation correction value, and a magnetic anomaly correction value.

[0010] According to a specific embodiment disclosed in the present application, the step of calculating the gravity correction data of the measured point based on the underwater gravity data includes:

[0011] Calculating a base point gravimeter reading correction value of the measured point according to the underwater gravity data;

[0012] The calculation formula of the base point gravimeter reading correction value is:

[0013] ;

[0014] in, is the calibration value of the base point gravimeter reading, is the base point gravimeter reading, is the water density, is the base point elevation, The vertical distance from the gravimeter to the instantaneous water surface when reading the base point, The vertical distance from the gravimeter to the elevation reference plane when reading the base point.

[0015] According to a specific embodiment disclosed in the present application, the step of calculating the gravity correction data of the measured point based on the underwater gravity data includes:

[0016] Calculating the zero drift value and the zero drift correction value of the measured point according to the underwater gravity data;

[0017] The calculation formula of the zero drift value is:

[0018] ;

[0019] in, is the zero drift value, is the absolute gravity value of the end point, is the absolute gravity value of the starting point, is the absolute gravity value of the final base point after correction, is the absolute gravity value of the starting point after correction; the calculation formula of the zero drift correction value of the point is:

[0020] ;

[0021] in, is the measurement point zero drift correction value, is the zero drift value, is the reading time of the gravimeter at the starting point, is the final base point gravimeter reading time, is the gravimeter reading time of the measured point.

[0022] According to a specific embodiment disclosed in the present application, the step of calculating the gravity correction data of the measured point based on the underwater gravity data includes:

[0023] Calculating the erroneous correction value of the point to be measured according to the underwater gravity data;

[0024] The calculation formula of the Erfu correction value of the measured point is:

[0025]

[0026] in, is the Erfu correction value of the test point, is the instantaneous speed of the ship at the point to be measured, is the instantaneous azimuth of the track of the point to be measured, is the geographical latitude of the point to be measured.

[0027] According to a specific embodiment disclosed in the present application, the step of calculating the gravity correction data of the measured point based on the underwater gravity data includes:

[0028] Calculating a tidal correction value of the measured point according to the underwater gravity data;

[0029] The calculation formula of the tidal correction value is:

[0030] ;

[0031] in, is the tidal correction value, is the water density, is the vertical distance from the gravimeter to the instantaneous water surface when reading the measured point, It is the vertical distance from the gravimeter to the elevation reference plane when reading the measured point.

[0032] According to a specific embodiment disclosed in the present application, the gravity correction value includes a normal gravity value, an absolute gravity value, a spatial gravity anomaly value, and a Bouguer correction value. The step of calculating the gravity correction data of the measured point based on the underwater gravity data includes:

[0033] Calculating the normal gravity value of the point to be measured according to the underwater gravity data;

[0034] The calculation formula of the normal gravity value of the measured point is:

[0035] ;

[0036] in, is the geographical latitude of the measured point in the geodetic coordinate system, is the normal gravity value;

[0037] Calculating the absolute gravity value of the point to be measured according to the underwater gravity data;

[0038] The calculation formula of the absolute gravity value of the measured point is:

[0039] ;

[0040] in, is the absolute gravity value of the point to be measured, is the absolute gravity value of the starting point, is the gravimeter reading of the initial base point after correction, is the zero drift correction value of the point to be measured, is the Erffa correction value of the test point, is the environmental correction value of the test point, is the tidal influence value of the measured point;

[0041] Calculating the spatial gravity anomaly value of the measured point according to the underwater gravity data;

[0042] The calculation formula of the space gravity anomaly value is:

[0043] , ;

[0044] in, is the spatial gravity anomaly value of the measured point, is the height correction value of the point to be measured, is the absolute gravity value of the point to be measured, is the normal gravity value of the point to be measured, The vertical height from the gravimeter to the elevation reference plane when reading the point to be measured;

[0045] Calculating the Bouguer correction value of the measured point according to the underwater gravity data;

[0046] The calculation formula of the Bouguer correction value of the measured point is:

[0047] ;

[0048] in, is the Bouguer correction value of the measured point, is the water density, and seawater is 1.03. is the rock density, take 2.67, is the vertical distance from the gravimeter elastic system to the seabed when reading the measured point, It is the height from the elastic system of the gravimeter to the elevation reference plane when reading the point to be measured.

[0049] According to a specific embodiment disclosed in the present application, the step of calculating the magnetic correction data of the measured point based on the underwater magnetic data includes:

[0050] The underwater magnetic data of the point to be measured is compensated in real time according to a magnetic compensation algorithm.

[0051] According to a specific embodiment disclosed in the present application, the step of calculating the magnetic correction data of the measured point based on the underwater magnetic data includes:

[0052] Calculating a diurnal variation correction value of the point to be measured based on the underwater magnetic data of the point to be measured;

[0053] The calculation formula of the daily variation correction value of the measured point is: ;

[0054] Among them, i is the point to be measured, t is the observation time, and f is the fitting function.

[0055] According to a specific embodiment disclosed in the present application, the step of calculating the magnetic correction data of the measured point based on the underwater magnetic data includes:

[0056] Calculating the magnetic anomaly value of the measured point according to the underwater magnetic data;

[0057] The calculation formula of the magnetic anomaly value of the measured point is:

[0058] ;

[0059] in, is the magnetic anomaly value of the measured point, is the magnetometer observation record value, is the carrier effect correction value, is the diurnal correction value, is the underwater environment correction value, is the normal geomagnetic field value.

[0060] In a second aspect, an embodiment of the present application provides a correction device for underwater gravity and magnetic data, the device comprising:

[0061] The acquisition module is used to collect underwater gravity data and underwater magnetic data of the test point;

[0062] A calculation module is used to calculate the gravity correction data of the test point based on the underwater gravity data, wherein the gravity correction data includes a base point gravimeter reading correction value, a zero drift value, a point zero drift correction value, an erroneous correction value, a tidal correction value, and a gravity correction value; and calculate the magnetic correction data of the test point based on the underwater magnetic data, wherein the magnetic correction data includes a carrier magnetic compensation correction value, a diurnal variation correction value, and a magnetic anomaly correction value.

[0063] In a third aspect, an embodiment of the present application provides an electronic device comprising a memory and a processor, wherein the memory is used to store a computer program, and when the computer program is run by the processor, the computer program executes the underwater gravity and magnetic data correction method provided in the first aspect.

[0064] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program, which, when running on a processor, executes the method for correcting underwater gravity and magnetic data provided in the first aspect.

[0065] The above-mentioned method for correcting underwater gravity and magnetic data provided by the present application collects underwater gravity data and underwater magnetic data of the point to be measured; calculates the gravity correction data of the point to be measured based on the underwater gravity data, wherein the gravity correction data includes the base point gravimeter reading correction value, zero drift value, point zero drift correction value, erroneous correction value, tide correction value and gravity correction value; calculates the magnetic correction data of the point to be measured based on the underwater magnetic data, wherein the magnetic correction data includes the carrier magnetic compensation correction value, diurnal variation correction value and magnetic anomaly correction value, and corrects various underwater gravity and magnetic data, providing technical support for the development and application of underwater gravity and magnetic exploration technology, and improving the exploration efficiency of underwater gravity and magnetic exploration technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to more clearly illustrate the technical solution of this application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of this application and should not be regarded as limiting the scope of protection of this application. In each figure, similar components are numbered similarly.

[0067] Figure 1 A schematic diagram showing a flow chart of a method for correcting underwater gravity and magnetic data provided in an embodiment of the present application is shown;

[0068] Figure 2 A schematic diagram of the structure of a correction device for underwater gravity and magnetic data provided by an embodiment of the present application is shown;

[0069] Figure 3 A schematic structural diagram of an electronic device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0070] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0071] The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but rather merely represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort are within the scope of protection of the present application.

[0072] Hereinafter, the terms "including", "having" and their cognates, which may be used in various embodiments of the present application, are intended only to indicate specific features, numbers, steps, operations, elements, components or combinations of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items or the possibility of adding one or more features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0073] Furthermore, the terms “first,” “second,” “third,” etc., are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0074] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which the various embodiments of the present application belong. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meaning as in the context of the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning unless clearly defined in the various embodiments of the present application.

[0075] Example 1

[0076] The embodiments of the present disclosure provide a method for correcting underwater gravity and magnetic data.

[0077] For details, see Figure 1 , the underwater gravity and magnetic data correction method includes:

[0078] Step S101 : collecting underwater gravity data and underwater magnetic data of the point to be measured.

[0079] Specifically, underwater towed gravity and magnetic measurements differ from ship-based measurements. Underwater towed measurements have the following characteristics: Because the support carrying the gravity and magnetic measuring instruments is towed along with the ship, the spatial location of the underwater gravity and magnetic observations changes dynamically due to the movement of waves and currents. The inherent magnetic fields of the ship, support, cables, and other observation equipment affect the magnetic field observations at the measurement point, and this influence varies with the spatial position of the ship and support. Oceanic forces such as tides, waves, and currents also cause changes in the gravity and magnetic fields, affecting underwater gravity and magnetic field measurements. Therefore, the correction technology for underwater gravity and magnetic data is more complex than that for ship-based measurements, requiring comprehensive consideration of factors such as the underwater measurement device, measurement method, and the dynamic measurement environment. During underwater towed measurements, the location of the support is referred to as the target point. The underwater gravity and magnetic data, including field values, time, depth, and angle data obtained by different instruments, must be standardized after collection. This involves removing outliers from the underwater gravity and magnetic data obtained by different instruments.

[0080] During implementation, filter delay correction is also performed. Currently, high-precision ocean gravimeters employ strong damping and filtering to suppress the effects of vertical acceleration and high-frequency noise. This results in the output gravity value reflecting the gravity anomaly at the carrier's location some time ago. Gravimeter delays can typically reach tens or even hundreds of seconds. Gravimeters are typically factory-calibrated for damping delay times under different sea conditions. For example, the filter time for sea state level 2 is 40 seconds.

[0081] Step S102, calculating the gravity correction data of the measured point based on the underwater gravity data, wherein the gravity correction data includes a base point gravimeter reading correction value, a zero drift value, a point zero drift correction value, an erroneous correction value, a tidal correction value, and a gravity correction value.

[0082] The step of calculating the gravity correction data of the point to be measured based on the underwater gravity data comprises:

[0083] Calculating a base point gravimeter reading correction value of the measured point according to the underwater gravity data;

[0084] The calculation formula of the base point gravimeter reading correction value is:

[0085] ;

[0086] in, is the calibration value of the base point gravimeter reading, is the base point gravimeter reading, is the water density, is the base point elevation, The vertical distance from the gravimeter to the instantaneous water surface when reading the base point, The vertical distance from the gravimeter to the elevation reference plane when reading the base point.

[0087] Specifically, when performing underwater gravity and magnetic data correction, the measuring equipment is placed on the deck of the ship during the base point reading process. Therefore, before comparing with the base point, the base point reading of the measuring equipment needs to be converted to the base point height.

[0088] The step of calculating the gravity correction data of the point to be measured based on the underwater gravity data comprises:

[0089] Calculating the zero drift value and the zero drift correction value of the measured point according to the underwater gravity data;

[0090] The calculation formula of the zero drift value is:

[0091] ;

[0092] in, is the zero drift value, is the absolute gravity value of the end point, is the absolute gravity value of the starting point, is the absolute gravity value of the final base point after correction, is the absolute gravity value of the starting point after correction; the calculation formula of the zero drift correction value of the point is:

[0093] ;

[0094] in, is the measurement point zero drift correction value, is the zero drift value, is the reading time of the gravimeter at the starting point, is the final base point gravimeter reading time, is the gravimeter reading time of the measured point.

[0095] In specific implementation, since the initial reading zero position of the ocean gravimeter is constantly changing, corresponding corrections can be made according to the law of change during the actual measurement process.

[0096] The step of calculating the gravity correction data of the point to be measured based on the underwater gravity data comprises:

[0097] Calculating the erroneous correction value of the point to be measured according to the underwater gravity data;

[0098] The calculation formula of the Erfu correction value of the measured point is:

[0099]

[0100] in, is the Erfu correction value of the test point, is the instantaneous speed of the ship at the point to be measured, is the instantaneous azimuth of the track of the point to be measured, is the geographical latitude of the point to be measured.

[0101] Specifically, since gravity is the combined force of the Earth's mass and the centrifugal force generated by the Earth's rotation, when underwater detection equipment is conducting dynamic measurements of ocean gravity, the gravimeter is not only affected by the Earth's rotation, but also by the additional centrifugal force generated by the carrier's speed. This effect is usually called the Ertefus effect.

[0102] The step of calculating the gravity correction data of the point to be measured based on the underwater gravity data comprises:

[0103] Calculating a tidal correction value of the measured point according to the underwater gravity data;

[0104] The calculation formula of the tidal correction value is:

[0105] ;

[0106] in, is the tidal correction value, is the water density, is the vertical distance from the gravimeter to the instantaneous water surface when reading the measured point, It is the vertical distance from the gravimeter to the elevation reference plane when reading the measured point.

[0107] Specifically, tides refer to the periodic rise and fall of seawater at various locations on the Earth's surface due to the gravitational pull of the moon and sun. In practice, when taking underwater gravity measurement basepoint readings, the gravimeter is located below the elevation surface. By correcting for gravity anomalies caused by changes in seawater above the geoid, the gravimeter's height to the instantaneous horizontal plane is calculated using the water depth of the submersible towed vehicle. The gravimeter's height is then calculated using the inertial positioning system. The difference between the two values ​​is then used to calculate the tidal height. This eliminates the effect of the instantaneous water body above the geoid at the time of the measurement point reading.

[0108] Specifically, the tidal correction also includes underwater environmental impact correction. By utilizing the gravity response of the wave and current model calculator and eliminating it, the gravity field changes caused by dynamic ocean water bodies such as waves and currents can be reduced, making the underwater gravity and magnetic data of the measured point more accurately corrected.

[0109] The gravity correction value includes a normal gravity value, an absolute gravity value, a space gravity anomaly value, and a Bouguer correction value. The step of calculating the gravity correction data of the measured point based on the underwater gravity data includes:

[0110] Calculating the normal gravity value of the point to be measured according to the underwater gravity data;

[0111] The calculation formula of the normal gravity value of the measured point is:

[0112] ;

[0113] in, is the geographical latitude of the measured point in the geodetic coordinate system, is the normal gravity value;

[0114] Calculating the absolute gravity value of the point to be measured according to the underwater gravity data;

[0115] The calculation formula of the absolute gravity value of the measured point is:

[0116] ;

[0117] in, is the absolute gravity value of the point to be measured, is the absolute gravity value of the starting point, is the gravimeter reading of the initial base point after correction, is the zero drift correction value of the point to be measured, is the Erffa correction value of the test point, is the environmental correction value of the test point, is the tidal influence value of the measured point;

[0118] Calculating the spatial gravity anomaly value of the measured point according to the underwater gravity data;

[0119] The calculation formula of the space gravity anomaly value is:

[0120] , ;

[0121] in, is the spatial gravity anomaly value of the measured point, is the height correction value of the point to be measured, is the absolute gravity value of the point to be measured, is the normal gravity value of the point to be measured, The vertical height from the gravimeter to the elevation reference plane when reading the point to be measured;

[0122] Calculating the Bouguer correction value of the measured point according to the underwater gravity data;

[0123] The calculation formula of the Bouguer correction value of the measured point is:

[0124] ;

[0125] in, is the Bouguer correction value of the measured point, is the water density, and seawater is 1.03. is the rock density, take 2.67, is the vertical distance from the gravimeter elastic system to the seabed when reading the measured point, It is the height from the elastic system of the gravimeter to the elevation reference plane when reading the point to be measured.

[0126] Specifically, when calculating the absolute gravity value at a test point, the gravimeter measures relative gravity, which is affected by many factors and requires multiple corrections. Since the origin has an absolute gravity value, the gravity value of the test point after multiple corrections can be converted to an absolute gravity value. The calculation of the spatial gravity anomaly at the test point is accomplished through a combination of normal field correction and altitude correction, using the surface gravity value of the Earth's reference ellipsoid.

[0127] Step S103 , calculating magnetic correction data of the measured point based on the underwater magnetic data, wherein the magnetic correction data includes a carrier magnetic compensation correction value, a diurnal variation correction value, and a magnetic anomaly correction value.

[0128] The step of calculating the magnetic correction data of the measured point based on the underwater magnetic data includes:

[0129] The underwater magnetic data of the point to be measured is compensated in real time according to a magnetic compensation algorithm.

[0130] Specifically, underwater magnetometers are subject to interference from the inherent magnetic field and induced magnetic field generated by the towed body and its accessories during operation. To ensure magnetic measurement accuracy, the carrier's magnetic interference must be eliminated. Therefore, a mathematical model for magnetic interference can be used to compensate for the magnetic data collected by the towed body in real time.

[0131] The step of calculating the magnetic correction data of the measured point based on the underwater magnetic data includes:

[0132] Calculating a diurnal variation correction value of the point to be measured based on the underwater magnetic data of the point to be measured;

[0133] The calculation formula of the daily variation correction value of the measured point is: ;

[0134] Among them, i is the point to be measured, t is the observation time, and f is the fitting function.

[0135] Specifically, due to the measurement environment limitations of marine magnetic surveys, it is often difficult to obtain geomagnetic station data during the magnetic survey period. By constructing a sea area diurnal variation field model to calculate the geomagnetic diurnal variation data of the measured point within a certain period of time, the geomagnetic diurnal variation data is used to perform diurnal variation correction of the sea area magnetic data. For quantitative calculation, the latitude is obtained by regression analysis of the diurnal variation value at time t and the longitude and latitude. and daily variation The diurnal correction value for the i-th measuring point at time t can be calculated using the above formula based on the fitting function relationship. Substituting the latitude of the measuring point and the observation time into the above formula yields the diurnal correction value. The calculated diurnal curve is then phase-corrected at a rate of 1 hour / 15° to complete the diurnal correction.

[0136] The step of calculating the magnetic correction data of the measured point based on the underwater magnetic data includes:

[0137] Calculating the magnetic anomaly value of the measured point according to the underwater magnetic data;

[0138] The calculation formula of the magnetic anomaly value of the measured point is:

[0139] ;

[0140] in, is the magnetic anomaly value of the measured point, is the magnetometer observation record value, is the carrier effect correction value, is the diurnal correction value, is the underwater environment correction value, is the normal geomagnetic field value.

[0141] The method for correcting underwater gravity and magnetic data provided in this embodiment collects underwater gravity data and underwater magnetic data of a target point; calculates gravity correction data of the target point based on the underwater gravity data, wherein the gravity correction data includes a base point gravimeter reading correction value, a zero drift value, a point zero drift correction value, an erroneous correction value, a tidal correction value, and a gravity correction value; and calculates magnetic correction data of the target point based on the underwater magnetic data, wherein the magnetic correction data includes a carrier magnetic compensation correction value, a diurnal variation correction value, and a magnetic anomaly correction value. Various underwater gravity and magnetic data are corrected, providing technical support for the development and application of underwater gravity and magnetic exploration technology and improving the exploration efficiency of underwater gravity and magnetic exploration technology.

[0142] Example 2

[0143] In addition, an embodiment of the present disclosure provides a correction device 200 for underwater gravity and magnetic data.

[0144] Specifically, see Figure 2 , the device comprises:

[0145] The acquisition module 201 is used to acquire underwater gravity data and underwater magnetic data of the test point;

[0146] The calculation module 202 is used to calculate the gravity correction data of the test point based on the underwater gravity data, wherein the gravity correction data includes the base point gravimeter reading correction value, zero drift value, point zero drift correction value, erroneous correction value, tide correction value and gravity correction value; and calculate the magnetic correction data of the test point based on the underwater magnetic data, wherein the magnetic correction data includes the carrier magnetic compensation correction value, diurnal variation correction value and magnetic anomaly correction value.

[0147] The underwater gravity and magnetic data correction device 200 provided in this embodiment can execute the underwater gravity and magnetic data correction method shown in Example 1, and will not be described again here to avoid repetition.

[0148] The underwater gravity and magnetic data correction device provided in this embodiment collects underwater gravity data and underwater magnetic data of a target point; calculates gravity correction data of the target point based on the underwater gravity data, wherein the gravity correction data includes a base point gravimeter reading correction value, a zero drift value, a point zero drift correction value, an erroneous correction value, a tidal correction value, and a gravity correction value; and calculates magnetic correction data of the target point based on the underwater magnetic data, wherein the magnetic correction data includes a carrier magnetic compensation correction value, a diurnal variation correction value, and a magnetic anomaly correction value. Various underwater gravity and magnetic data are corrected, thereby providing technical support for the development and application of underwater gravity and magnetic exploration technology and improving the exploration efficiency of underwater gravity and magnetic exploration technology.

[0149] Example 3

[0150] In addition, an embodiment of the present disclosure provides an electronic device 300, including a memory and a processor, wherein the memory stores a computer program, and when the computer program runs on the processor, it executes the underwater gravity and magnetic data correction method provided in the above-mentioned embodiment 1.

[0151] For details, see Figure 3 The electronic device 300 includes: a transceiver 301, a bus interface and a processor 302.

[0152] In the embodiment of the present invention, the electronic device 300 further includes a memory 303. Figure 3In the embodiment, the bus architecture may include any number of interconnected buses and bridges, specifically linking various circuits such as one or more processors represented by processor 302 and memory represented by memory 303. The bus architecture may also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides an interface. The transceiver 301 may be a plurality of components, i.e., a transmitter and a receiver, providing a unit for communicating with various other devices over a transmission medium. The processor 302 is responsible for managing the bus architecture and general processing, and the memory 303 may store data used by the processor 302 when performing operations.

[0153] The electronic device 300 provided in the embodiment of the present invention can execute the underwater gravity and magnetic data correction method shown in Example 1, which will not be described again here to avoid repetition.

[0154] Example 4

[0155] In this embodiment, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0156] The computer-readable storage medium provided in this embodiment 4 can execute the underwater gravity and magnetic data correction method shown in embodiment 1. To avoid repetition, it will not be described here.

[0157] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or terminal comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or terminal. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or terminal comprising the element.

[0158] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0159] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A method for correcting underwater gravity and magnetic data, characterized in that: The method comprises: Collect underwater gravity data and underwater magnetic data of the test point; Calculating gravity correction data of the measured point based on the underwater gravity data, wherein the gravity correction data includes a base point gravimeter reading correction value, a zero drift value, a measuring point zero drift correction value, an Erfahrenheit correction value, a tide correction value, and a gravity correction value; Calculating magnetic correction data of the measured point based on the underwater magnetic data, wherein the magnetic correction data includes a carrier magnetic compensation correction value, a diurnal variation correction value, and a magnetic anomaly correction value; The gravity correction value includes a normal gravity value, an absolute gravity value, a space gravity anomaly value, and a Bouguer correction value. The step of calculating the gravity correction data of the measured point based on the underwater gravity data includes: Calculating the normal gravity value of the point to be measured according to the underwater gravity data; The calculation formula of the normal gravity value of the measured point is: ； in, is the geographical latitude of the point to be measured, is the normal gravity value of the point to be measured; Calculating the absolute gravity value of the point to be measured according to the underwater gravity data; The calculation formula of the absolute gravity value of the measured point is: ； in, is the absolute gravity value of the point to be measured, is the absolute gravity value of the starting point, is the gravimeter reading of the initial base point after correction, is the measurement point zero drift correction value, is the Erfau correction value of the point to be measured, is the environmental correction value of the test point, is the tidal correction value; Calculating the spatial gravity anomaly value of the measured point according to the underwater gravity data; The calculation formula of the space gravity anomaly value is: ， ； in, is the spatial gravity anomaly value of the measured point, is the height correction value of the point to be measured, is the absolute gravity value of the point to be measured, is the normal gravity value of the point to be measured, It is the vertical distance from the gravimeter to the elevation reference plane when reading the measured point; Calculating the Bouguer correction value of the measured point according to the underwater gravity data; The calculation formula of the Bouguer correction value of the measured point is: ； in, is the Bouguer correction value of the measured point, is the water density, and seawater is 1.

03. is the rock density, take 2.67, is the vertical distance from the gravimeter to the seabed when reading the measured point, It is the vertical distance from the gravimeter to the elevation reference plane when reading the measured point.

2. The method according to claim 1, characterized in that The step of calculating the gravity correction data of the point to be measured based on the underwater gravity data comprises: Calculating a base point gravimeter reading correction value of the measured point according to the underwater gravity data; The calculation formula of the base point gravimeter reading correction value is: in, is the calibration value of the base point gravimeter reading, is the base point gravimeter reading, is the water density, is the base point elevation, The vertical distance from the gravimeter to the instantaneous water surface when reading the base point, The vertical distance from the gravimeter to the elevation reference plane when reading the base point.

3. The method according to claim 1, characterized in that The step of calculating the gravity correction data of the point to be measured based on the underwater gravity data comprises: Calculating the zero drift value of the measured point and the zero drift correction value of the measured point according to the underwater gravity data; The calculation formula of the zero drift value is: ； in, is the zero drift value, is the absolute gravity value of the end point, is the absolute gravity value of the starting point, is the final base point gravimeter reading after correction, is the reading of the gravimeter at the initial base point after correction; the calculation formula for the zero drift correction value of the measuring point is: ； in, is the measurement point zero drift correction value, is the zero drift value, is the time of reading the gravimeter at the starting point, is the final base point gravimeter reading time, is the gravimeter reading time of the measured point.

4. The method according to claim 1, wherein The step of calculating the gravity correction data of the point to be measured based on the underwater gravity data comprises: Calculating the Erflöss correction value of the point to be measured according to the underwater gravity data; The calculation formula of the Erfau correction value of the test point is: in, is the Erfau correction value of the point to be measured, is the instantaneous speed of the ship at the point to be measured, is the instantaneous azimuth of the track of the point to be measured, is the geographical latitude of the point to be measured.

5. The method according to claim 1, wherein The step of calculating the gravity correction data of the point to be measured based on the underwater gravity data comprises: Calculating a tidal correction value of the measured point according to the underwater gravity data; The calculation formula of the tidal correction value is: ； in, is the tidal correction value, is the water density, is the vertical distance from the gravimeter to the instantaneous water surface when reading the measured point, It is the vertical distance from the gravimeter to the elevation reference plane when reading the measured point.

6. The method according to claim 1, characterized in that The step of calculating the magnetic correction data of the measured point based on the underwater magnetic data includes: The underwater magnetic data of the point to be measured is compensated in real time according to a magnetic compensation algorithm.

7. The method according to claim 1, characterized in that The step of calculating the magnetic correction data of the measured point based on the underwater magnetic data includes: Calculating a diurnal variation correction value of the point to be measured based on the underwater magnetic data of the point to be measured; The calculation formula of the daily variation correction value of the measured point is: ; Among them, i is the point to be measured, t is the observation time, represents the diurnal correction value of the measured point i at the observation time t, is the latitude obtained by longitude and latitude regression analysis, and f is the fitting function.

8. The method according to claim 1, characterized in that The step of calculating the magnetic correction data of the measured point based on the underwater magnetic data includes: Calculating the magnetic anomaly value of the measured point according to the underwater magnetic data; The calculation formula of the magnetic anomaly value of the measured point is: ； in, is the magnetic anomaly value of the measured point, is the magnetometer observation record value, is the carrier effect correction value, is the diurnal correction value, is the underwater environment correction value, is the normal geomagnetic field value.

9. A correction device for underwater gravity and magnetic data, characterized in that: The device comprises: The acquisition module is used to collect underwater gravity data and underwater magnetic data of the test point; a calculation module, configured to calculate gravity correction data of the measured point based on the underwater gravity data, wherein the gravity correction data includes a base point gravimeter reading correction value, a zero drift value, a measuring point zero drift correction value, an Erfahrenheit correction value, a tide correction value, and a gravity correction value; and calculate magnetic correction data of the measured point based on the underwater magnetic data, wherein the magnetic correction data includes a carrier magnetic compensation correction value, a diurnal variation correction value, and a magnetic anomaly correction value; The gravity correction value includes a normal gravity value, an absolute gravity value, a space gravity anomaly value, and a Bouguer correction value. The step of calculating the gravity correction data of the measured point based on the underwater gravity data includes: Calculating the normal gravity value of the point to be measured according to the underwater gravity data; The calculation formula of the normal gravity value of the measured point is: ； in, is the geographical latitude of the point to be measured, is the normal gravity value of the point to be measured; Calculating the absolute gravity value of the point to be measured according to the underwater gravity data; The calculation formula of the absolute gravity value of the measured point is: ； in, is the absolute gravity value of the point to be measured, is the absolute gravity value of the starting point, is the gravimeter reading of the initial base point after correction, is the measurement point zero drift correction value, is the Erfau correction value of the point to be measured, is the environmental correction value of the test point, is the tidal correction value; Calculating the spatial gravity anomaly value of the measured point according to the underwater gravity data; The calculation formula of the space gravity anomaly value is: ， ； in, is the spatial gravity anomaly value of the measured point, is the height correction value of the point to be measured, is the absolute gravity value of the point to be measured, is the normal gravity value of the point to be measured, It is the vertical distance from the gravimeter to the elevation reference plane when reading the measured point; Calculating the Bouguer correction value of the measured point according to the underwater gravity data; The calculation formula of the Bouguer correction value of the measured point is: ； in, is the Bouguer correction value of the measured point, is the water density, and seawater is 1.

03. is the rock density, take 2.67, is the vertical distance from the gravimeter to the seabed when reading the measured point, It is the vertical distance from the gravimeter to the elevation reference plane when reading the measured point.

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