CN114397698A - Double-coordinate system precision unifying method and system suitable for seismic physical simulation - Google Patents

Abstract

The invention relates to a method and a system for unifying precision of a dual-coordinate system suitable for seismic physical simulation. Firstly, respectively moving a coordinate system where a seismic source excitation device is located and a coordinate system where a signal receiving device is located to respective coordinate zero points, and installing a measuring pin under the excitation and receiving devices; then, a standard ball is placed in the intersection area of the measuring ranges of the seismic source excitation coordinate system and the signal receiving coordinate system; measuring and point-taking are carried out on the standard ball in a coordinate system excited by a seismic source and a coordinate system for receiving signals respectively, and the circle center coordinates and the radius of the sphere center of the standard ball in the respective coordinate systems are obtained; obtaining a bias parameter; finally, a bias parameter is placed in any one of the coordinate systems to modify the coordinate output, and the coordinate system for receiving the signal and the coordinate system for exciting the seismic source have a unified zero coordinate. The method has the advantages of high measuring and calculating precision, high automation degree, simplicity and convenience in secondary development and utilization and intuitionistic closed-loop data check.

Description

Double-coordinate system precision unifying method and system suitable for seismic physical simulation

Technical Field

The invention relates to a method and a system for unifying double-coordinate precision of physical simulation, belongs to the technical field of seismic physical simulation, and particularly relates to a method and a system for unifying double-coordinate system precision suitable for seismic physical simulation.

Background

At present, two types of prior art mainly exist for a method for unifying the precision of a seismic source excitation and signal receiving dual-coordinate system for seismic physical simulation.

Wherein, the scheme of the prior art one is:

(1) moving the seismic source excitation coordinate system or the signal receiving coordinate system to a relative initial position;

(2) determining the positions of a seismic source excitation device and a signal receiving device by using a micrometer;

(3) and (3) after all the measurements are completed, confirming whether the distance between the two is within a certain allowable error range with the difference value of the step (2).

In the prior art, the precision error of the intermediate process cannot be guaranteed; the programming is not intuitive, the operability is poor, and the human error is large; meanwhile, the temperature and the humidity of the measuring environment have great influence.

The scheme of the second prior art is as follows:

(1) selecting a fixed point within the range of the seismic source excitation coordinate system and the signal receiving coordinate system;

(2) measuring the coordinates of the point by using two coordinate systems respectively;

(3) calculating the difference between the two;

(4) and after the physical simulation is finished, measuring the coordinates of the fixed point twice, and judging whether the difference value of the two is within an allowable error range.

In the second prior art, a dual-coordinate system unification is not realized, only quality control before and after physical simulation is performed, points selected by the second prior art are only selected by naked eye judgment, the subjectivity is too large, and the error precision of measurement and multi-point measurement of a three-dimensional sphere are not an order of magnitude due to the fact that the measurement is only one point of a plane. In addition, the second prior art is not easy to check the relation between the seismic physical simulation and the measurement data, and is not easy to check the deviation error of the measurement coordinate in the running process of the measurement program; the unification of a physical simulation program and a measurement program is not facilitated; since the positional uniqueness of the measurement before and after the fixed point is not necessarily satisfied, the accuracy of the measurement before and after the measurement of the measurement point of the selected object is not uniform.

In summary, a method and a system for unifying the precision of a dual-coordinate system are provided to solve the above problems, which are urgently needed to be solved in the technical field of seismic physical simulation

Disclosure of Invention

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

In order to solve the problems in the prior art, the invention discloses a method and a system for unifying the precision of a dual-coordinate system suitable for seismic physical simulation. Firstly, respectively moving a coordinate system where a seismic source excitation device is located and a coordinate system where a signal receiving device is located to respective coordinate zero points, and installing a measuring pin under the excitation and receiving devices; then, a standard ball is placed in the intersection area of the measuring ranges of the seismic source excitation coordinate system and the signal receiving coordinate system; measuring and point-taking are carried out on the standard ball in a coordinate system excited by a seismic source and a coordinate system for receiving signals respectively, and the circle center coordinates and the radius of the sphere center of the standard ball in the respective coordinate systems are obtained; obtaining a bias parameter; finally, a bias parameter is placed in any one of the coordinate systems to modify the coordinate output, and the coordinate system for receiving the signal and the coordinate system for exciting the seismic source have a unified zero coordinate.

In order to solve the problems, the scheme of the invention is as follows:

a method and a system for unifying the precision of a dual-coordinate system suitable for seismic physical simulation comprise the following steps:

step 1, respectively moving a coordinate system where a seismic source is excited and a coordinate system where a signal is received to coordinate zero points of respective systems, and installing measuring pins under a seismic source excitation device and a signal receiving device;

step 2, placing a standard ball in the intersection area of the measuring ranges of the seismic source excitation coordinate system and the signal receiving coordinate system;

step 3, measuring and point-taking are carried out on the standard ball in a coordinate system excited by the seismic source and a coordinate system for receiving signals respectively, and the circle center coordinates and the radius of the sphere center of the standard ball in the respective coordinate systems are obtained;

step 4, solving a bias parameter;

and 5, placing the bias parameters into any one coordinate system to modify the coordinate output.

Preferably, in the step 1, the coordinate system where the seismic source is excited and the coordinate system where the signal is received are respectively moved to the zero coordinates of the respective systems, and the probe is installed under the seismic source excitation device and the signal receiving device, the method and the system for unifying the precision of the dual coordinate systems suitable for seismic physical simulation includes the following sub-steps:

step 1.1, connecting a seismic source excitation device and a signal receiving device with respective coordinate systems respectively;

step 1.2, moving the seismic source excitation and signal receiving device to the zero point of a coordinate system where the seismic source excitation and signal receiving device is located respectively;

and 1.3, respectively installing measuring pins below the seismic source excitation device and the signal receiving device.

Preferably, in the step 2, a standard sphere is placed in an intersection area of measurement ranges of the seismic source excitation coordinate system and the signal receiving coordinate system.

The standard sphere is generally a standard sphere which is made of ceramic, has the sphericity not higher than 0.3um, has the diameter of 25.399mm and has a measurement and calibration certificate.

Preferably, in the step 3, the method and the system for unifying the precision of the dual coordinate system suitable for the seismic physical simulation, respectively measuring and point-taking a standard sphere in the coordinate system excited by the seismic source and the coordinate system received by the signal, and calculating the center coordinates of the sphere center of the standard sphere in the respective coordinate systems, includes the following sub-steps:

step 3.1, measuring and taking points of the standard ball in the seismic source excitation system, wherein at least 4 points of the taken measuring points are not on the same plane, and the number of the taken points is not less than 4;

step 3.2, calculating the coordinates and the radius of the sphere center through the formula 1, namely G1 and r, and solving an arithmetic mean value;

in the formula (x)_n，y_n，z_n) Coordinates representing the nth point, (r)_x1,r_y1,r_z1) And r₁Respectively representing the sphere center coordinates and radius to be found. Taking 4 points which are not on the same plane to obtain r according to the Cramer's law or substitution method_x1,r_y1,r_z1And r₁。

Step 3.3, comparing the measured and calculated radius with the standard value and the sphericity parameter of the standard ball, judging whether the measured and calculated radius is within the error precision allowable range, if so, continuing to carry out the subsequent steps, otherwise, re-executing the step 3.1 and the step 3.2;

step 3.4, taking the coordinate system of signal reception as a measuring system, executing steps 3.1 to 3.3, and obtaining the spherical center coordinate G2 and the radius, namely r_x2,r_y2,r_z2And r₂。。

Preferably, in the above method and system for unifying precision of a dual coordinate system suitable for seismic physical simulation, the step 4 of obtaining the bias parameter includes the following steps:

step 4.1, extracting the sphere center coordinate r obtained in the step 3_x1,r_x2Calculating an x-axis offset parameter according to equation 2;

x_k＝r_x1+r_x2formula 2

Step 4.2, extracting the sphere center coordinate r obtained in the step 3_y1,r_y2The y-axis offset parameter is calculated according to equation 3.

y_k＝r_y1+r_y2Formula 3

Preferably, in the above method and system for unifying precision of a dual coordinate system suitable for seismic physical simulation, in step 5, a bias parameter is placed in any one of the coordinate systems to modify a coordinate output. The embedding method comprises the following steps:

step 5.1, adding a correction module M to the initial measurement data (x, y) of any one of the coordinate systems, and obtaining a new output result (x) as shown in formula 4_t、y_t)；

Step 5.2, assigning the offset value to a correction module M;

step 5.3, the initial measurement data and correction module outputs x of the new coordinate system according to the comprehensive operation result of the formula 5_t、y_t：

A dual-coordinate system precision unified system suitable for seismic physical simulation comprises the following modules:

the original coordinate zero-resetting module is used for respectively moving a coordinate system where the seismic source is excited and a coordinate system where the signal is received to coordinate zero points of respective systems, and measuring pins are arranged under the seismic source excitation device and the signal receiving device;

the standard ball placement module is used for placing a standard ball in an intersection area of the measuring ranges of the seismic source excitation coordinate system and the signal receiving coordinate system;

the standard ball measuring module is used for measuring and point-taking the standard ball in a coordinate system excited by the seismic source and a coordinate system for receiving the signal respectively, and calculating the center coordinates and the radius of the center of the standard ball in the respective coordinate systems;

the offset parameter calculating module is used for calculating an offset parameter;

and the coordinate precision unifying module is used for placing the bias parameters in any one coordinate system to modify the coordinate output.

Preferably, the standard sphere measurement module performs the following steps:

step 3.1, measuring and taking points of the standard ball in the seismic source excitation system, wherein at least 4 points of the taken measuring points are not on the same plane, and the number of the taken points is not less than 4;

step 3.2, calculating the coordinates and the radius of the sphere center through the formula 1, namely G1 and r, and solving an arithmetic mean value;

in the formula (x)_n，y_n，z_n) Coordinates representing the nth point, (r)_x1,r_y1,r_z1) And r₁Respectively representing the sphere center coordinates and radius to be found. Taking 4 points which are not on the same plane to obtain r according to the Cramer's law or substitution method_x1,r_y1,r_z1And r₁。

Step 3.3, comparing the measured and calculated radius with the standard value and the sphericity parameter of the standard ball, judging whether the measured and calculated radius is within the error precision allowable range, if so, continuing to carry out the subsequent steps, otherwise, re-executing the step 3.1 and the step 3.2;

step 3.4, taking the coordinate system of signal reception as a measurement system, executingStep 3.1 to 3.3, the sphere center coordinate G2 and the radius, namely r, are obtained_x2,r_y2,r_z2And r₂。。

Preferably, the bias parameter obtaining module performs the following steps:

step 4.1, extracting the sphere center coordinate r obtained in the step 3_x1,r_x2Calculating an x-axis offset parameter according to equation 2;

x_k＝r_x1+r_x2formula 2

Step 4.2, extracting the sphere center coordinate r obtained in the step 3_y1,r_y2The y-axis offset parameter is calculated according to equation 3.

y_k＝r_y1+r_y2Formula 3

Preferably, the coordinate precision unifying module executes the following steps:

step 5.1, adding a correction module M to the initial measurement data (x, y) of any one of the coordinate systems, and obtaining a new output result (x) as shown in formula 4_t、y_t)；

Step 5.2, assigning the offset value to a correction module M;

step 5.3, the initial measurement data and correction module outputs x of the new coordinate system according to the comprehensive operation result of the formula 5_t、y_t：

Therefore, compared with the prior art, the invention has the following advantages:

1. the measuring and calculating precision is high, the offset value is measured by adopting a measuring standard ball, and the result precision is further improved by adopting a plurality of times of measurement to calculate the average value.

2. The automation degree is high, errors are placed in measurement hardware, and data are automatically calculated.

3. The secondary development and utilization of subsequent measurement data are simpler and more convenient, the coordinate system is consistent with a secondary measurement coordinate system after coordinate conversion, and the closed-loop check of the data is more visual.

Drawings

The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments of the present invention and, together with the description, further serve to explain the principles of the invention and to enable a person skilled in the pertinent art to make and use the disclosure.

FIG. 1 is a flow chart of a method and system for unifying the precision of a dual coordinate system suitable for seismic physical simulation according to the present invention;

FIG. 2 is a schematic diagram of the seismic source excitation and signal reception dual-coordinate operation.

Embodiments of the present invention will be described with reference to the accompanying drawings.

Detailed Description

Examples

Fig. 1 shows a method for unifying the precision of a dual coordinate system suitable for seismic physical simulation according to this embodiment. The method mainly comprises the following steps:

step 1, moving a coordinate system where a seismic source is excited and a coordinate system where a signal is received to coordinate zero points of respective systems, respectively, installing a measuring probe under a seismic source excitation device and the signal receiving device, and acquiring accurate coordinates of a measured point through the action of the measuring probe and a measured object.

Step 2, placing a standard ball in the intersection area of the measuring ranges of the seismic source excitation coordinate system and the signal receiving coordinate system;

step 3, measuring and point-taking are carried out on the standard ball in a coordinate system excited by the seismic source and a coordinate system for receiving signals respectively, and the circle center coordinates and the radius of the sphere center of the standard ball in the respective coordinate systems are obtained;

step 4, solving a bias parameter;

and 5, placing the bias parameters into any one coordinate system to modify the coordinate output.

As a preferable mode, in this embodiment, step 1 includes the following sub-steps:

step 1.1, connecting a seismic source excitation device and a signal receiving device with respective coordinate systems respectively;

step 1.2, moving the seismic source excitation and signal receiving device to the zero point of a coordinate system where the seismic source excitation and signal receiving device is located respectively;

and 1.3, respectively installing measuring pins below the seismic source excitation device and the signal receiving device.

As shown in fig. 2, in this embodiment, the seismic source excitation device and the signal receiving device are respectively installed on the Z axis, the coordinate axis of the seismic source excitation device is moved to the origin of coordinates of the seismic source excitation system shown in the figure, and the coordinate axis of the signal receiving device is moved to the origin of coordinates of the signal receiving system shown in the figure; and measuring pins are respectively arranged below the seismic source excitation device and the signal receiving device.

In a preferred mode, in the present embodiment, the standard sphere in step 2 is selected from a standard sphere which is made of ceramic, has a sphericity of not higher than 0.3um, has a diameter of 25.399mm, and has a measurement calibration certificate. As shown in fig. 2, a standard sphere is typically placed within the bounds of the measured physical model.

As a preferable mode, in this embodiment, step 3 includes the following sub-steps:

step 3.1, measuring and taking points of the standard ball in the seismic source excitation system, wherein at least 4 points of the taken measuring points are not on the same plane, and the number of the taken points is not less than 4;

step 3.2, calculating the coordinates and the radius of the sphere center through the formula 1, namely G1 and r, and solving an arithmetic mean value;

in the formula (x)_n，y_n，z_n) Coordinates representing the nth point, (r)_x1,r_y1,r_z1) And r₁Respectively representing the sphere center coordinates and radius to be found. Taking 4 points which are not on the same plane to obtain r according to the Cramer's law or substitution method_x1,r_y1,r_z1And r₁。

Step 3.3, comparing the measured and calculated radius with the standard value and the sphericity parameter of the standard ball, judging whether the measured and calculated radius is within the error precision allowable range, if so, continuing to carry out the subsequent steps, otherwise, re-executing the step 3.1 and the step 3.2;

step 3.4, taking the coordinate system of signal reception as a measuring system, executing steps 3.1 to 3.3, and obtaining the spherical center coordinate G2 and the radius, namely r_x2,r_y2,r_z2And r₂。

Specifically, taking 6 points as an example, the coordinate points are (x) respectively₁，y₁)(x₂，y₂)(x₃，y₃)(x₄，y₄)(x₅，y₅)(x₆，y₆) Then, there are:

taking 4 points which are not on the same plane, and calculating the sphere center coordinate r of the standard sphere according to the Cramer's rule or substitution method_x1,r_y1,r_z1And r₁. Wherein the 4 equations in the above equation total 15 choices, excluding the number of combinations P of points on the same plane, so that the total number of calculations is effectively W-15-P, and then the arithmetic mean of the W values is taken as the final G1 and r calculation, i.e. r_x1,r_y1,r_z1And r₁。

As a preferable mode, in this embodiment, step 4 includes the following sub-steps:

step 4.1, extracting the sphere center coordinate r obtained in the step 3_x1,r_x2Calculating the bias parameters of the two coordinate systems on the x axis according to the formula 2;

x_k＝r_x1+r_x2formula 2

Step 4.2, extracting the sphere center coordinate r obtained in the step 3_y1,r_y2The y-axis offset parameter is calculated according to equation 3.

y_k＝r_y1+r_y2Formula 3

As a preferable mode, step 5 in the present embodiment includes the following substeps:

step 5.1, adding a correction module M to the initial measurement data (x, y) of any one of the coordinate systems, and obtaining a new output result (x) as shown in formula 4_t、y_t)；

Wherein the offset is the absolute value of the distance between the two coordinate axes, one of the actual measurements is subtracted, and the result is a measurement referenced to the zero point of the other coordinate.

Step 5.2, assigning the offset value to a correction module M;

step 5.3, the initial measurement data and correction module outputs x of the new coordinate system according to the comprehensive operation result of the formula 5_t、y_t：

Therefore, the aim that the coordinate system of the seismic source excitation end and the coordinate system of the signal receiving end have the unified zero point coordinate is achieved.

The embodiment also provides a system for unifying the precision of a dual-coordinate system suitable for seismic physical simulation, which comprises the following modules:

the original coordinate zero-resetting module is used for respectively moving a coordinate system where the seismic source is excited and a coordinate system where the signal is received to coordinate zero points of respective systems, and measuring pins are arranged under the seismic source excitation device and the signal receiving device;

the standard ball placement module is used for placing a standard ball in an intersection area of the measuring ranges of the seismic source excitation coordinate system and the signal receiving coordinate system;

the standard ball measuring module is used for measuring and point-taking the standard ball in a coordinate system excited by the seismic source and a coordinate system for receiving the signal respectively, and calculating the center coordinates and the radius of the center of the standard ball in the respective coordinate systems;

the offset parameter calculating module is used for calculating an offset parameter;

and the coordinate precision unifying module is used for placing the bias parameters in any one coordinate system to modify the coordinate output.

Preferably, the standard sphere measurement module performs the following steps:

step 3.1, measuring and taking points of the standard ball in the seismic source excitation system, wherein at least 4 points of the taken measuring points are not on the same plane, and the number of the taken points is not less than 4;

step 3.2, calculating the coordinates and the radius of the sphere center through the formula 1, namely G1 and r, and solving an arithmetic mean value;

in the formula (x)_n，y_n，z_n) Coordinates representing the nth point, (r)_x1,r_y1,r_z1) And r₁Respectively representing the sphere center coordinates and radius to be found. Taking 4 points which are not on the same plane to obtain r according to the Cramer's law or substitution method_x1,r_y1,r_z1And r₁。

Step 3.3, comparing the measured and calculated radius with the standard value and the sphericity parameter of the standard ball, judging whether the measured and calculated radius is within the error precision allowable range, if so, continuing to carry out the subsequent steps, otherwise, re-executing the step 3.1 and the step 3.2;

step 3.4, taking the coordinate system of signal reception as a measuring system, executing steps 3.1 to 3.3, and obtaining the spherical center coordinate G2 and the radius, namely r_x2,r_y2,r_z2And r₂。。

Preferably, the bias parameter obtaining module performs the following steps:

step 4.1, extracting the sphere center coordinate r obtained in the step 3_x1,r_x2Calculating an x-axis offset parameter according to equation 2;

x_k＝r_x1+r_x2formula 2

Step 4.2, extracting the sphere center coordinate r obtained in the step 3_y1,r_y2The y-axis offset parameter is calculated according to equation 3.

y_k＝r_y1+r_y2Formula 3

Preferably, the coordinate precision unifying module executes the following steps:

step 5.1, adding a correction module M to the initial measurement data (x, y) of any one of the coordinate systems, and obtaining a new output result (x) as shown in formula 4_t、y_t)；

Step 5.2, assigning the offset value to a correction module M;

step 5.3, the initial measurement data and correction module outputs x of the new coordinate system according to the comprehensive operation result of the formula 5_t、y_t：

As can be seen from the above description, the embodiments of the present invention have the following advantages:

1. the measuring and calculating precision is high, the offset value is measured by adopting a measuring standard ball, and the result precision is further improved by adopting a plurality of times of measurement to calculate the average value.

2. The automation degree is high, errors are placed in measurement hardware, and data are automatically calculated.

3. The secondary development and utilization of subsequent measurement data are simpler and more convenient, the coordinate system is consistent with a secondary measurement coordinate system after coordinate conversion, and the closed-loop check of the data is more visual.

In this embodiment, while, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more embodiments, occur in different orders and/or concurrently with other acts from that shown and described herein or not shown and described herein, as may be understood by those of ordinary skill in the art.

It is noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A dual-coordinate system precision unifying method suitable for seismic physical simulation is characterized by comprising the following steps:

step 1, respectively moving a coordinate system where a seismic source is excited and a coordinate system where a signal is received to coordinate zero points of respective systems, and installing measuring pins under a seismic source excitation device and a signal receiving device;

step 2, placing a standard ball in the intersection area of the measuring ranges of the seismic source excitation coordinate system and the signal receiving coordinate system;

step 3, measuring and point-taking are carried out on the standard ball in a coordinate system excited by the seismic source and a coordinate system for receiving signals respectively, and the circle center coordinates and the radius of the sphere center of the standard ball in the respective coordinate systems are obtained;

step 4, solving a coordinate offset parameter between a coordinate system excited by the seismic source and a coordinate system for receiving the signal;

and 5, placing the bias parameters into any one coordinate system to modify the coordinate output.

2. The method for unifying precision of dual coordinate system suitable for seismic physical simulation as claimed in claim 1, wherein said step 1 comprises the following sub-steps:

step 1.1, connecting a seismic source excitation device and a signal receiving device with respective coordinate systems respectively;

step 1.2, moving the seismic source excitation and signal receiving device to the zero point of a coordinate system where the seismic source excitation and signal receiving device is located respectively;

and 1.3, respectively installing measuring pins below the seismic source excitation device and the signal receiving device.

3. The method for unifying precision of dual coordinate system suitable for seismic physical simulation of claim 1, wherein said standard sphere of step 2 is made of ceramic, has sphericity not higher than 0.3um, and has diameter of 25.399 mm.

4. The method for unifying precision of dual coordinate system suitable for seismic physical simulation as claimed in claim 1, wherein said step 3 comprises the following sub-steps:

step 3.1, measuring and taking points of the standard ball in the seismic source excitation system, wherein at least 4 points of the taken measuring points are not on the same plane, and the number of the taken points is not less than 4;

step 3.2, calculating the coordinates and the radius of the sphere center through the formula 1, namely G1 and r, and solving an arithmetic mean value;

in the formula (x)_n，y_n，z_n) Coordinates representing the nth point, (r)_x1,r_y1,r_z1) And r₁Respectively representing the sphere center coordinates and radius to be found. Taking 4 points which are not on the same plane to obtain r according to the Cramer's law or substitution method_x1,r_y1,r_z1And r₁。

Step 3.3, comparing the measured and calculated radius with the standard value and the sphericity parameter of the standard ball, judging whether the measured and calculated radius is within the error precision allowable range, if so, continuing to carry out the subsequent steps, otherwise, re-executing the step 3.1 and the step 3.2;

step 3.4, taking the coordinate system of signal reception as a measuring system, executing steps 3.1 to 3.3, and obtaining the spherical center coordinate G2 and the radius, namely r_x2,r_y2,r_z2And r₂。

5. The method for unifying precision of dual coordinate system suitable for seismic physical simulation as claimed in claim 4, wherein said step 4, said deriving bias parameter comprises the following sub-steps:

step 4.1, extracting the sphere center coordinate r obtained in the step 3_x1,r_x2Calculating an x-axis offset parameter according to equation 2;

x_k＝r_x1+r_x2formula 2

Step 4.2, extracting the sphere center coordinate r obtained in the step 3_y1,r_y2The y-axis offset parameter is calculated according to equation 3.

y_k＝r_y1+r_y2And (3) formula.

6. The method for unifying precision of dual coordinate systems suitable for seismic physics simulation according to claim 1, wherein said step 5 comprises the sub-steps of:

step 5.1, adding a correction module M to the initial measurement data (x, y) of any one of the coordinate systems, and obtaining a new output result (x) as shown in formula 4_t、y_t)；

Step 5.2, assigning the offset value to a correction module M;

step 5.3, the initial measurement data and correction module outputs x of the new coordinate system according to the comprehensive operation result of the formula 5_t、y_t：

。

7. A dual-coordinate system precision unified system suitable for seismic physical simulation is characterized by comprising the following modules:

the original coordinate zero-resetting module is used for respectively moving a coordinate system where the seismic source is excited and a coordinate system where the signal is received to coordinate zero points of respective systems, and measuring pins are arranged under the seismic source excitation device and the signal receiving device;

the standard ball placement module is used for placing a standard ball in an intersection area of the measuring ranges of the seismic source excitation coordinate system and the signal receiving coordinate system;

the standard ball measuring module is used for measuring and point-taking the standard ball in a coordinate system excited by the seismic source and a coordinate system for receiving the signal respectively, and calculating the center coordinates and the radius of the center of the standard ball in the respective coordinate systems;

the offset parameter calculation module is used for calculating a coordinate offset parameter between a coordinate system excited by the seismic source and a coordinate system for receiving the signal;

and the coordinate precision unifying module is used for placing the bias parameters in any one coordinate system to modify the coordinate output.

8. The method of claim 7, wherein the standard sphere measurement module performs the following steps:

step 3.1, measuring and taking points of the standard ball in the seismic source excitation system, wherein at least 4 points of the taken measuring points are not on the same plane, and the number of the taken points is not less than 4;

step 3.2, calculating the coordinates and the radius of the sphere center through the formula 1, namely G1 and r, and solving an arithmetic mean value;

in the formula (x)_n，y_n，z_n) Coordinates representing the nth point, (r)_x1,r_y1,r_z1) And r₁Respectively representing the sphere center coordinates and radius to be found. Taking 4 points which are not on the same plane to obtain r according to the Cramer's law or substitution method_x1,r_y1,r_z1And r₁。

Step 3.3, comparing the measured and calculated radius with the standard value and the sphericity parameter of the standard ball, judging whether the measured and calculated radius is within the error precision allowable range, if so, continuing to carry out the subsequent steps, otherwise, re-executing the step 3.1 and the step 3.2;

step 3.4, taking the coordinate system of signal reception as a measuring system, executing steps 3.1 to 3.3, and obtaining the spherical center coordinate G2 and the radius, namely r_x2,r_y2,r_z2And r₂。

9. The method of claim 8, wherein the bias parameter calculation module performs the following steps:

step 4.1, extracting the sphere center coordinate r obtained in the step 3_x1,r_x2Calculating an x-axis offset parameter according to equation 2;

x_k＝r_x1+r_x2formula 2

Step 4.2, extracting the sphere center coordinate r obtained in the step 3_y1,r_y2The y-axis offset parameter is calculated according to equation 3.

y_k＝r_y1+r_y2And (3) formula.

10. The method of claim 9, wherein the coordinate precision unification module performs the following steps:

step 5.1, adding a correction module M to the initial measurement data (x, y) of any one of the coordinate systems, and obtaining a new output result (x) as shown in formula 4_t、y_t)；

Step 5.2, assigning the offset value to a correction module M;

step 5.3, the initial measurement data and correction module outputs x of the new coordinate system according to the comprehensive operation result of the formula 5_t、y_t：

。

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