Geomagnetic detection data optimization method

Abstract

The invention discloses a geomagnetic detection data optimization method, which comprises the following steps: generating a standard magnetic field by using a parallel ring, recording the magnetic field intensity as a ring mark measurement value, measuring the magnetic measurement intensity of the standard magnetic field by using a magnetic measurement probe based on the standard magnetic field, recording the magnetic measurement intensity as a ring measurement measurement value, and calculating the geomagnetic detection data based on the ring mark measurement value and the ring measurement measurement value. And obtaining a probe sensitivity correction coefficient of the magnetic measurement probe. And measuring the local magnetic field intensity of the location by using the magnetic probe, recording the local magnetic field intensity as a geometric measurement value, and combining with a reference standard value of the local magnetic field intensity to obtain the zero point deviation of the magnetic probe. The reference standard value of the local magnetic field intensity can be measured by using a higher-resolution instrument, and can also be published in related standards. And correcting the magnetic field measurement value by using the probe sensitivity correction factor and the zero deviation. According to different earth environment magnetic fields in different regions, the actual measurement value of the magnetic field can be correspondingly corrected.

Description

Technical Field

[0001] The invention belongs to the field of magnetic measurement, and in particular relates to a method for optimizing geomagnetic detection data. Background Art

[0002] Ship magnetic field is inherent in ships built of steel. Its existence affects the navigation safety of ships and restricts the improvement of ship combat effectiveness. The size and distribution of ship magnetic field directly determine the magnetic protection capability of ships. Therefore, in-depth extraction of ship magnetic field characteristic information can provide favorable support for demagnetization work and demagnetization effect evaluation.

[0003] However, after a ship changes its course, its berthing position is prone to change, and the corresponding magnetic field measurement position coordinates are difficult to ensure to remain fixed, which will cause certain measurement errors. How to correct this error has become an urgent problem to be solved in this field. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes a geomagnetic detection data optimization method for accurately correcting magnetic field measurement values.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for optimizing geomagnetic detection data comprises the following steps:

[0007] A standard magnetic field is generated by using a parallel ring, and the magnetic field strength is recorded as a ring mark measurement value. Based on the standard magnetic field, a magnetic measuring probe is used to measure the magnetic intensity of the standard magnetic field, which is recorded as a ring measurement value. Based on the ring mark measurement value and the ring measurement value, a probe sensitivity correction coefficient of the magnetic measuring probe is obtained;

[0008] The local magnetic field strength is measured using the magnetic probe, recorded as a ground measurement value, and then combined with the local magnetic field strength reference standard value to obtain the zero point deviation of the magnetic probe;

[0009] The magnetic field measurement value is corrected using the probe sensitivity correction coefficient and the zero point deviation.

[0010] Preferably, the parallel rings are Helmholtz coils;

[0011] A standard current is passed through the Helmholtz coil using a standard voltage to generate the standard magnetic field, and the ring standard measurement value is the product of the standard current value and the parallel ring constant;

[0012] The probe sensitivity correction coefficient A of the magnetic measuring probe i for

[0013]

[0014] Among them, Hi环测 is the ring measurement value, H i环标 is the ring mark measurement value.

[0015] Preferably, the zero point deviation B i for:

[0016] B i =H 地标 -A i H i地测

[0017] Among them, H 地标 is the reference standard value of the local magnetic field strength, H i地测 is the geodetic measurement value.

[0018] Preferably, the corrected magnetic field measurement value H i for:

[0019] H i =A i H′ i +B i

[0020] Among them, H′ i is the measured value of the magnetic field strength of the i-th magnetic probe.

[0021] The beneficial effects of the present invention are as follows:

[0022] The geomagnetic detection data optimization method and system of the present invention can correct the actual measured value of the magnetic field according to the difference of the earth environment magnetic field in different regions. At the same time, the correction method has low requirements on the accuracy of the magnetic probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative labor:

[0024] Figure 1 A schematic diagram of a magnetic measuring device used in the present invention;

[0025] Figure 2 This is a schematic diagram of the flow of the geomagnetic detection data optimization method according to the first embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the geomagnetic detection data optimization system according to the second embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] First, the source of the magnetic field measurement value corrected by the present invention is briefly introduced. The present invention uses the magnetic field strength measured by the following equipment as an example, but it does not mean that only such equipment can be corrected. The present invention can correct the magnetic field value measured by the magnetic field measuring equipment.

[0029] like Figure 1 As shown, it is a schematic diagram of the magnetic measuring equipment used in the present invention, including a magnetic measuring device, an analog circuit part, a bandpass filter circuit, an AC amplifier circuit, a phase-sensitive detection circuit, a low-pass filter circuit, an integral amplifier circuit, a limiting device, a phase shifter and a phase lock.

[0030] The magnetic measuring device includes an excitation coil, a measuring coil and an iron core. The excitation coil and the measuring coil are wound around the iron core at the same time, and the iron core must be placed along the direction of the magnetic field.

[0031] The analog circuit part includes a crystal oscillator, a frequency divider, a filter and an excitation circuit connected in sequence, which is used to generate a rectangular wave voltage with a preset frequency of fHz and a positive and negative half-wave symmetry, thereby measuring the magnetic field H 0 The excitation coil in the magnet generates an excitation current.

[0032] The analog circuit also provides a reference signal to the phase-sensitive detection circuit through a phase shifter and a phase lock in sequence.

[0033] The excitation circuit is connected to the excitation coil. Using the nonlinearity of the iron core B-H curve, under the combined action of the excitation current and the measured magnetic field, a magnetic field H is generated in the measuring coil. 0 The corresponding even harmonic induced potential. Among them, the second harmonic voltage signal is the most obvious, and its magnitude is similar to the measured magnetic field H. 0 The magnitude is proportional to the measured magnetic field H. 0 direction.

[0034] The even harmonic induced potential is filtered through a bandpass filter circuit to obtain a second harmonic voltage signal.

[0035] After the second harmonic voltage signal is subjected to AC amplification processing by an AC amplifier circuit, a detection signal is generated by a phase-sensitive detection circuit.

[0036] After the detection signal passes through a low-pass filter circuit, an integral amplifier circuit and a limiting device, a DC voltage signal with the same magnitude and direction as the measured magnetic field is obtained.

[0037] Finally, the A / D circuit converts the DC voltage signal into a frequency signal proportional to it, and the decoding device counts, latches and decodes the frequency signal to obtain a digital signal, and uses a display to display the digital quantity represented by the digital signal. This digital quantity is the correction object of the present invention.

[0038] Embodiment 1

[0039] like Figure 2 FIG. 1 is a flow chart of a method for optimizing geomagnetic detection data according to a first embodiment of the present invention, which mainly includes the following steps:

[0040] S1. Generate a standard magnetic field using parallel rings. The magnetic field strength is recorded as the ring mark measurement value. Based on the standard magnetic field, a magnetic probe is used to measure the magnetic intensity of the standard magnetic field, which is recorded as the ring measurement value. Based on the ring mark measurement value and the ring measurement value, the probe sensitivity correction coefficient of the magnetic probe is obtained.

[0041] Specifically, in this embodiment, the parallel rings use Helmholtz coils.

[0042] A standard current is passed through the Helmholtz coil using a standard voltage to generate a standard magnetic field. The ring standard measurement value is the product of the standard current value and the parallel ring constant.

[0043] Probe sensitivity correction factor A of magnetic probe i for:

[0044]

[0045] Among them, H i环测 is the ring measurement value, H i环标 The value is the ring mark measurement.

[0046] S2. Use a magnetic probe to measure the local magnetic field strength at the location, record it as the ground measurement value, and then combine it with the local magnetic field strength reference standard value to obtain the zero point deviation of the magnetic probe. The local magnetic field strength reference standard value can be measured using a higher resolution instrument, or the published value in the relevant standard can be used.

[0047] Then, the zero point deviation B i for:

[0048] B i =H 地标 -A i H i地测

[0049] Among them, H 地标 is the reference standard value of the local magnetic field strength, H i地测 It is the geodetic measurement value.

[0050] S3. Use the probe sensitivity correction factor and zero point offset to correct the magnetic field measurement.

[0051] Specifically, the corrected magnetic field measurement value H i for:

[0052] H i =A i H′ i +B i

[0053] Among them, H′ i is the measured value of the magnetic field strength of the i-th magnetic probe.

[0054] Embodiment 2

[0055] like Figure 3 , which is a schematic diagram of the structure of the geomagnetic detection data optimization system according to the second embodiment of the present invention, mainly includes a sensitivity correction module, a zero point deviation correction module and a measurement value correction module.

[0056] Specifically, in this embodiment, the sensitivity correction module is used to obtain the probe sensitivity correction coefficient of the magnetic measuring probe according to the ring mark measurement value and the ring measurement measurement value.

[0057] The zero point deviation correction module is used to obtain the zero point deviation of the magnetic probe according to the ground measurement value and the local magnetic field strength reference standard value.

[0058] The measurement value correction module is used to correct the magnetic field measurement value according to the probe sensitivity correction coefficient and the zero point deviation.

[0059] Furthermore, in this embodiment, a Helmholtz coil is used as a parallel loop, a standard current is passed through the Helmholtz coil using a standard voltage, and a standard magnetic field is generated, and the magnetic field strength is recorded as a ring mark measurement value. The ring mark measurement value is the product of the standard current value and the parallel loop constant.

[0060] Based on the standard magnetic field, a magnetic probe is used to measure the magnetic intensity of the standard magnetic field, which is recorded as the ring measurement value.

[0061] Probe sensitivity correction factor A of magnetic probe i for

[0062]

[0063] Among them, H i环测 is the ring measurement value, H i环标 The value is the ring mark measurement.

[0064] Furthermore, in this embodiment, a magnetic probe is used to measure the local magnetic field strength, which is recorded as a ground measurement value, and then combined with the local magnetic field strength reference standard value to obtain the zero point deviation of the magnetic probe.

[0065] Zero point deviation B i for:

[0066] B i =H 地标 -A i H i地测

[0067] Among them, H 地标 is the reference standard value of the local magnetic field strength, H i地测 It is the geodetic measurement value.

[0068] Furthermore, in this embodiment, the corrected magnetic field measurement value H i for:

[0069] H i =A i H′ i +B i

[0070] Among them, H′ i is the measured value of the magnetic field strength of the i-th magnetic probe.

[0071] The embodiments described above are only descriptions of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for optimizing geomagnetic detection data, characterized in that: The following steps are involved: A standard magnetic field is generated by using a parallel ring, and the magnetic field strength is recorded as a ring mark measurement value. Based on the standard magnetic field, a magnetic measuring probe is used to measure the magnetic intensity of the standard magnetic field, which is recorded as a ring measurement value. Based on the ring mark measurement value and the ring measurement value, a probe sensitivity correction coefficient of the magnetic measuring probe is obtained; The local magnetic field strength is measured using the magnetic probe, recorded as a ground measurement value, and then combined with the local magnetic field strength reference standard value to obtain the zero point deviation of the magnetic probe; The magnetic field measurement value is corrected using the probe sensitivity correction coefficient and the zero point deviation.

2. The geomagnetic detection data optimization method according to claim 1, characterized in that: The parallel ring adopts a Helmholtz coil; A standard current is passed through the Helmholtz coil using a standard voltage to generate the standard magnetic field, and the ring standard measurement value is the product of the standard current value and the parallel ring constant; The probe sensitivity correction coefficient A of the magnetic measuring probe i for Among them, H i环测 is the ring measurement value, H i环标 is the ring mark measurement value.

3. The geomagnetic detection data optimization method according to claim 2, characterized in that: The zero point deviation B i for: B i =H 地标 -A i H i地测 Among them, H 地标 is the reference standard value of the local magnetic field strength, H i地测 is the geodetic measurement value.

4. The method for optimizing geomagnetic detection data according to claim 3, characterized in that: Corrected magnetic field measurement value H i for: H i =A i H′ i +B i Among them, H′ i is the measured value of the magnetic field strength of the i-th magnetic probe.

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