CN114063181B - High-precision correction method for gravity base point reading of marine gravity measurement - Google Patents
High-precision correction method for gravity base point reading of marine gravity measurement Download PDFInfo
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- CN114063181B CN114063181B CN202111367089.1A CN202111367089A CN114063181B CN 114063181 B CN114063181 B CN 114063181B CN 202111367089 A CN202111367089 A CN 202111367089A CN 114063181 B CN114063181 B CN 114063181B
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- 230000005484 gravity Effects 0.000 title claims abstract description 174
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V7/00—Measuring gravitational fields or waves; Gravimetric prospecting or detecting
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- G01V7/06—Analysis or interpretation of gravimetric records
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Abstract
The invention discloses a high-precision marine gravity measurement gravity base point reading correction method, which comprises the steps of carrying out altitude correction, middle water layer correction, correction of the north-south distance between a gravity meter and a base point and correction of the solid tide of the base point gravity reading to obtain the gravity base point gravity reading. According to the high-precision marine gravity measurement gravity base point reading correction method, the gravity meter reading is reset to the reference surface position (the projection position of the gravity base point on the reference surface) right below the gravity base point, so that various correction physical meanings are more definite, meanwhile, the gravity base point comparison precision can be effectively improved, and the method is worthy of popularization and use.
Description
Technical Field
The invention is applied to the fields of marine geophysics, marine surveying and mapping, marine geological survey and the like, and is particularly applied to high-precision marine gravity measurement.
Background
Marine gravimetric measurements are an important tool for marine geophysical measurements and marine mapping.
Marine gravity measurement is used not only for marine geology research but also for earth shape research of refined ground level. In military aspect, gravity data can be used for track calculation and inertial navigation of a space vehicle, and the hit rate of a remote missile is improved.
The correction of the gravity reading of the gravity measuring base point is a necessary work, and is generally carried out according to the marine gravity investigation specification, including the correction of the height and the correction of an intermediate water layer, wherein the correction of the gravity reading height of the gravity base point is caused by the vertical height from the gravity meter to the base pointCorrecting the gravity difference, wherein the correction is 0.3086 ×H2, mGAL is unit, and the height from the gravity meter to the base point is unit m is H1; the correction of the water layer in the middle of the gravity base point reading is the correction of the gravity difference caused by the water layer between the water surface and the reference surface, and the correction is 0.0419 Xρ× [ H0- (H1+H2)]The unit mGAL, H0 is the vertical height from the base point to the reference plane, the unit m, H2 is the vertical height from the gravity meter to the water surface, the unit m, ρ is the sea water density, and the unit g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the General gravity base reading correction formula (see fig. 1, 2):
g base group ＝g Basic reading -0.3086×H1-0.0419×ρ×[H0-(H1+H2)]/2 (1)
The gravity base point reading correction formula (1) has certain defects for high-precision gravity measurement, and does not return the gravity meter reading to the reference plane position right below the gravity base point (the projection position of the gravity base point on the reference plane), and does not correct solid tide, so that how to improve the formula (1) and increase the measurement precision is a technical problem which is urgently needed to be solved by a person skilled in the art.
Disclosure of Invention
The invention provides a high-precision correction method for gravity base point readings of marine gravity measurement.
The invention provides the following scheme:
a high accuracy marine gravity measurement gravity base point reading correction method, comprising:
and (3) carrying out altitude correction, middle water layer correction, and correction of the distance between the gravity meter and the foundation point in the north-south direction on the foundation point gravity reading and the solid tide correction on the foundation point gravity reading.
Preferably: correction of the base point gravity reading is achieved by the following equation (2):
g base group ＝g Basic reading +0.3086×(H0-H1)-0.0419×ρ×[H0-(H1+H2)]/X+△g North-South +△g Fixing device (2)
Wherein: g Base group G is the gravity reading of the base point obtained after correction Basic reading For the base gravity reading, 0.3086 × (H0-H1) is the amount of altitude correction, 0.0419 ×ρ× [ H0- (H1+H2)]X is the correction of the middle water layer, Δg North-South Is a gravity meter andthe correction amount of gravity value difference caused by the north-south distance of the base point, delta g Fixing device For the correction of the solid tide of the gravity reading of the base point, H0 is the vertical height from the base point to the reference surface, H1 is the vertical height from the measuring gravity instrument to the gravity base point, H2 is the height from the measuring gravity instrument to the water surface, ρ is the sea water density, and X is 1 or 2.
Preferably: the Deltag is North-South Is the gravity difference value caused by the north-south distance between the gravity meter and the gravity base point.
Preferably: the Deltag is Fixing device The gravity normal field formula is obtained by differentiating the latitude.
Preferably: and one side of the dock foundation is water, and when one side is land, X is 2.
Preferably: and when water is arranged on two sides of the dock base point, X is 1.
Preferably: the method is used for correcting zero drift and calculating absolute gravity values of measuring points in a work area, and the high-precision base point gravity reading correction is required to be performed for altitude correction, middle water layer correction, north-south distance correction of the base point gravity reading and solid tide correction of the base point gravity reading.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention can realize a high-precision correction method for the gravity base point reading of marine gravity measurement, which comprises altitude correction, middle water layer correction, gravity value difference correction caused by the north-south distance between a gravity meter and the gravity base point and base point gravity reading solid tide correction. According to the high-precision marine gravity measurement gravity base point reading correction method, the gravity meter reading is reset to the reference surface position right below the gravity base point (the projection position of the gravity base point on the reference surface), and meanwhile, solid tide correction is carried out, so that various correction physical meanings are more clear, correction precision is improved, and popularization and use are worth.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of gravity base point comparison at different times T1 and T2 according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing the gravity base point comparison between before the operation of the sea (T1) and after the operation of the sea (T2) according to the embodiment of the present invention.
In the figure: a gravimeter 1, a gravimeter carrying ship 2 and a wharf gravity base point 3.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
Examples
The embodiment of the invention provides a high-precision correction method for gravity base point readings of marine gravity measurement, which can comprise the following steps:
and correcting the height of the gravity base point reading, correcting an intermediate water layer, correcting the gravity value difference caused by the distance between the gravity meter and the base point in the north-south direction and correcting the solid tide of the gravity reading of the base point.
The method provided by the embodiment of the application improves the gravity base point reading correction method in the prior art, increases the gravity value difference correction and the base point gravity reading solid tide correction caused by the north-south distance between the gravity meter and the base point, and improves the accuracy of gravity reading.
In particular implementations, embodiments of the present application may provide for correction of the base point gravity reading by the following equation (2):
g base group ＝g Basic reading +0.3086×(H0-H1)-0.0419×ρ×[H0-(H1+H2)]/X+△g North-South +△g Fixing device (2)
Wherein: g Base group G is the gravity reading of the base point obtained after correction Basic reading For the base gravity reading 0.3086 × (H0-H1) is the amount of altitude correction in mGAL,0.0419 ×ρ× [ H0- (H1+H2)]X is the amount of correction of the intermediate aqueous layer, units mGAl, Δg North-South The gravity value difference correction value is the unit mGAL, deltag caused by the north-south distance between the gravity meter and the base point Fixing device For the correction of the solid tide of the gravity reading of the base point, mGAL is the vertical height from the base point to the base plane, mGAL is the vertical height from the measuring gravity instrument to the gravity base point, mGAL is the vertical height from the measuring gravity instrument to the water surface, and ρ is the sea water density in g/cm 3 X is 1 or 2.
Specifically, the Δg North-South Is the gravity difference value caused by the north-south distance between the gravity meter and the gravity base point. The Deltag is Fixing device The gravity normal field formula is obtained by differentiating the latitude. And one side of the dock foundation is water, and when one side is land, X is 2. And when water is arranged on two sides of the dock base point, X is 1.
In order to implement zero drift correction for a gravity meter, the embodiment of the application requires gravity base point comparison and gravity base point reading correction, and the gravity base point reading correction includes: altitude correction, middle water layer correction, gravity value difference correction caused by the distance between the gravity meter and the foundation point in the north-south direction, and foundation point gravity reading solid tide correction.
The gravity base point reading correction formula (1) has certain defects for high-precision gravity measurement, the gravity meter reading is not reset to the reference surface position right below the gravity base point (the projection position of the gravity base point on the reference surface), the solid tide correction is not carried out, and the formula (1) is changed into:
g base group ＝g Basic reading +0.3086×(H0-H1)-0.0419×ρ×[H0-(H1+H2)]/X+△g North-South +△g Fixing device (2)
Wherein Deltag north-south is the gravity difference value caused by the north-south distance between the gravity instrument and the gravity base point, and the unit mGAL; Δg is the solids tide correction, unit mGAL. Δg North-South The gravity normal field formula can be used for differentiating latitude to obtain delta g Fixing device The time and longitude and latitude functions are obtained according to the formula in the specification.
Most dock bases are water on one side and land on one side, so the middle water layer correction of equations (1) and (2) is divided by 2 (X equals 2), and if both dock bases are water, the middle layer correction is not divided by 2 (X equals 1).
The formula (2) improves the formula (1), so that the physical meaning is more definite, and the precision is improved.
The gravity base point reading correction is to essentially reset the gravity meter reading to the projection position of the gravity base point on the reference surface, the absolute gravity value of the gravity base point of the wharf is obtained by joint measurement from the gravity base point of a higher level, the absolute gravity value, the coordinates and the elevation value of the gravity base point of the wharf are required to be built into files, the absolute value of the gravity base point is the absolute gravity value on the reference surface, but some absolute values of the gravity base point of the wharf are not reset to the reference surface, and the water surface height when the gravity base point is set is required to be measured.
Before the marine gravity measurement, the gravity instrument needs to be subjected to a series of tests, after meeting the requirements, a survey ship carrying the gravity instrument is close to a dock gravity base point, the vertical height H1 from the gravity instrument to the gravity base point T1 moment, the height H2 from the gravity instrument to the water surface T1 moment, the north-south distance L between the gravity instrument and the gravity base point T1 moment is measured (or the azimuth angle and the horizontal distance between the gravity instrument and the gravity base point are measured to calculate L), and the gravity reading g at the moment T1 is recorded Basic reading 1 Correcting the gravity reading according to the formula (2):
g base 1 ＝g Basic reading 1 +0.3086×(H0-H1)-0.0419×ρ×[H0-(H1+H2)]/2+△g North-South +△g Fixing device (3)
After the offshore gravity measurement is finished, the survey ship returns to the wharf to correct the gravity base point reading again, and the H1, H2 and L values are necessarily caused to be different from the previous gravity base point reading correction due to the water level change, the ship weight change and the ship position difference. Also recorded are H1, H2, L and g at time T2 Basic reading 2 The value is obtained by correcting the gravity reading according to the formula (2):
g base 2 ＝g Basic reading 2 +0.3086×(H0-H1)-0.0419×ρ×[H0-(H1+H2)]/2+△g North-South +△g Fixing device (4)
By g Base 1 And g Base 2 The value calculation zero drift correction has higher precision.
In a word, the high-precision ocean gravity measurement gravity base point reading correction method provided by the application is used for homing the gravity meter reading to the reference surface position right below the gravity base point (the projection position of the gravity base point on the reference surface), and simultaneously carrying out solid tide correction, so that each correction physical meaning is more definite. Meanwhile, the correction precision can be effectively improved, and the method is worthy of large-area popularization and use.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (4)
1. A method for correcting a gravity base point reading of high-precision marine gravity measurement, the method comprising:
carrying out altitude correction, middle water layer correction, and distance correction between the gravity meter and the foundation point in the north-south direction on the foundation point gravity reading, and carrying out solid tide correction on the foundation point gravity reading to obtain a corrected foundation point gravity reading;
correction of the base point gravity reading is achieved by the following equation (2):
g base group ＝g Basic reading +0.3086×(H0-H1)-0.0419×ρ×[H0-(H1+H2)]/X+△g North-South +△g Fixing device (2)
Wherein: g Base group G is the gravity reading of the base point obtained after correction Basic reading For the base gravity reading, 0.3086 × (H0-H1) is the amount of altitude correction, 0.0419 ×ρ× [ H0- (H1+H2)]X is the correction of the middle water layer, Δg North-South For the correction of the north-south distance of the base point gravity reading, the delta g North-South The gravity difference value is caused by the north-south distance between the gravity instrument and the gravity base point; Δg Fixing device For the amount of correction of the solid tide for the base point gravity reading, the Δg Fixing device In order to obtain the latitude differential by a gravity normal field formula, H0 is the vertical height from a base point to a reference plane, H1 is the vertical height from a gravity meter to a gravity base point, H2 is the height from the gravity meter to the water surface, ρ is the sea water density, and X is 1 or 2.
2. The method of calibrating a gravity base point reading for high accuracy marine gravity measurement according to claim 1, wherein the dock base point is water on one side and X is 2 on one side on land.
3. The method for correcting the readings of a gravity base point for high-precision marine gravity measurement according to claim 1, wherein X is 1 when water is on both sides of the dock base point.
4. The method for correcting the high-precision marine gravity measurement gravity base point reading according to claim 1, wherein the gravity ratio and the gravity reading correction are carried out on the dock base point before and after construction, and further the zero drift correction is carried out.
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| RU2009111163A (en) * | 2009-03-26 | 2010-10-10 | Федеральное Государственное Унитарное Предприятие "Государственный Научно-Исследовательский Навигационно-Гидрографический Институт | METHOD FOR GRAVIMETRIC SHOOTING OF AQUATORIA BY SHIP AND DEVICE FOR ITS IMPLEMENTATION |
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| CN111413749A (en) * | 2020-04-03 | 2020-07-14 | 自然资源部第二海洋研究所 | Antarctic ship-borne gravity measurement calibration method |
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| AU2016305571B2 (en) * | 2015-08-13 | 2022-02-03 | Cgg Services Sas | System and method for gravity and/or gravity gradient terrain corrections |
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| JP2006118971A (en) * | 2004-10-21 | 2006-05-11 | Jfe Engineering Kk | Method for measuring and evaluating pipeline shape and its apparatus |
| RU2009111163A (en) * | 2009-03-26 | 2010-10-10 | Федеральное Государственное Унитарное Предприятие "Государственный Научно-Исследовательский Навигационно-Гидрографический Институт | METHOD FOR GRAVIMETRIC SHOOTING OF AQUATORIA BY SHIP AND DEVICE FOR ITS IMPLEMENTATION |
| CN106997061A (en) * | 2017-04-05 | 2017-08-01 | 中国空间技术研究院 | A kind of method that relative velocity improves gravitational field inversion accuracy between star based on disturbance |
| CN111413749A (en) * | 2020-04-03 | 2020-07-14 | 自然资源部第二海洋研究所 | Antarctic ship-borne gravity measurement calibration method |
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