CN106197174B - The adaptability analysis method that bullet is applied in a kind of missile-borne magnetic assembled gesture measurement apparatus - Google Patents
The adaptability analysis method that bullet is applied in a kind of missile-borne magnetic assembled gesture measurement apparatus Download PDFInfo
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- CN106197174B CN106197174B CN201610721294.6A CN201610721294A CN106197174B CN 106197174 B CN106197174 B CN 106197174B CN 201610721294 A CN201610721294 A CN 201610721294A CN 106197174 B CN106197174 B CN 106197174B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B15/00—Self-propelled projectiles or missiles, e.g. rockets; Guided missiles
- F42B15/01—Arrangements thereon for guidance or control
Abstract
The invention discloses the adaptability analysis method that bullet in a kind of missile-borne magnetic assembled gesture measurement apparatus is applied, this method comprises the following steps：1) the abnormal impact analysis in region magnetic field；2) shooting parameter impact analysis；3) meteorological condition impact analysis；4) impact analysis of magnetic anomaly；5) impact analysis of carrier-borne environment；6) impact analysis of missile-borne environment.For this method from factor analyses such as different geographical, shooting parameter, meteorological condition, magnetic anomaly, carrier-borne environment, missile-borne environment, the measuring accuracy of missile-borne magnetic assembled gesture measurement apparatus is very high and has stronger adaptability.
Description
Technical field
The invention belongs to earth-magnetism navigation applied technical field, specifically, is related to a kind of missile-borne magnetic assembled gesture measurement dress
Put the adaptability analysis method of bullet application.
Background technology
Earth's magnetic field is the basic physical field of earth system, is the intrinsic resource of the earth, is provided for Aeronautics and Astronautics, navigation
Natural referential, it can be applied to the positioning and directing and gesture stability on spacecraft or naval vessel.Utilize magnetic field of the earth spatial distribution
It is magnetic navigation technology simple and effective, dependable performance, anti-interference, it is always the indispensable basic navigation positioning hand of World Developed Countries
Section, as the very high Boeing of automaticity is all mounted with magnetic navigation alignment system.Currently, geomagnetic technology is widely used to
The numerous areas such as geoscience, resource detection, space flight and aviation, traffic communication, earthquake prediction, space weather, mapping, possess huge
Application potential.
Magnetic field of the earth is the same with earth gravitational field, is One Earth One Family physical field, and it is by main field and variation magnetic field two
Part composition.Main field derives from earth interior, studies its change and its origin, is always the weight in geodynamics
One of content is wanted, and variation magnetic field is then relevant with the change and solar activity in ionosphere etc..Earth's magnetic field is the magnetic by separate sources
Field stacks up composition, earth's magnetic field can be divided into two large divisions by its source：A part is stabilizing magnetic field, and another part is main
It is initiated by the quick variation magnetic field of outside of the earth.Much weaker than stabilizing magnetic field in quick variation magnetic field, maximum change also only accounts for total
The 2%-4% in magnetic field.Therefore stabilizing magnetic field is the major part in earth's magnetic field.The change of geomagnetic main field is extremely slow, this change
Change the long period variation for being referred to as earth's magnetic field.The variation magnetic field of the earth is then initiated by outside and is superimposed upon various on main field
Short-period geomagnetic field variation.Fundamental magnetic field of the earth change is very slow, and Annual Variation Rate is below one thousandth.External field change
Time size is smaller, and change is more complicated, the intensity of external field when tranquil less than internal field one thousandth, during strong disturbance
External field also less than 1 the percent of internal field.Therefore, when considering earth's magnetic field influence to spacecraft in itself, need to only examine
Consider the main field in internal field.
The aerial statue measurement of shell, attitude measurement is still a big technical barrier at home particularly under high overload, a lot
Method is still in exploring.
The content of the invention
It is an object of the invention to overcome defect present in the aerial statue e measurement technology of shell, there is provided a kind of missile-borne magnetic
The adaptability analysis method that bullet is applied in assembled gesture measurement apparatus.
Its concrete technical scheme is：
The adaptability analysis method that bullet is applied in a kind of missile-borne magnetic assembled gesture measurement apparatus, comprises the following steps：
1) the abnormal impact analysis in region magnetic field
Geomagnetic sensors detection magnetic field range is adapted to global different geographical, and the magnetic anomaly situation for various regions is seen,
The exception of the magnetic field intensity of different geographical earth magnetism, magnetic declination and magnetic dip angle, the test of corresponding missile-borne magnetic assembled gesture measurement apparatus
Worst error is within ± 3 °；
2) shooting parameter impact analysis
The firing angle and directive of shell transmitting have an impact to the measuring accuracy of missile-borne magnetic assembled gesture measurement apparatus；
Magnetic assembled gesture measurement apparatus can use in 0 °~360 ° full directives, consider engineer applied and ensure test essence
The angle of degree, missile-borne magnetic assembled gesture measurement apparatus detection body roll attitude information requirements shell directive and magnetic north is more than 1.0 °
More than；
In-flight influence of the change of the angle of pitch and yaw angle to missile-borne magnetic assembled gesture measurement apparatus is according to satellite on bullet
The ballistic inclination angle and course of positioner processing are modified, and its test error is to missile-borne magnetic assembled gesture measurement apparatus
Test error is within 2.0 °；
3) meteorological condition impact analysis
It is abnormal that the intensity of 100 nanoteslas is produced when earth magnetism, the influence to missile-borne magnetic assembled gesture measurement apparatus measurement accuracy is only
There is 1.2 ° of influence；
4) impact analysis of magnetic anomaly
Huge magnetic storm is influenceed within ± 5 ° on the measuring accuracy of missile-borne magnetic assembled gesture measurement apparatus, and magnetic storm amplitude reaches thousand
It is more than nanotesla；
5) impact analysis of carrier-borne environment
Missile-borne magnetic assembled gesture measurement apparatus energy normal work under during experiment is applied through various radar illumination, does not influence to survey
Accuracy of measurement；
6) impact analysis of missile-borne environment
In-flight electric current reaches 10A, can produce certain electromagnetic interference, when guided cartridge designs, be employed in steering gear flat
Anti-electromagnetic-radiation isolated material；Missile-borne magnetic assembled gesture measurement apparatus specially devises anti-electromagnetic interference circuit when designing；Simultaneously
Missile-borne magnetic assembled gesture measurement apparatus is with steering gear electric-machine distance in more than 200mm.
Compared with prior art, beneficial effects of the present invention：
The adaptability analysis method that bullet is applied in a kind of missile-borne magnetic assembled gesture measurement apparatus provided by the invention, this method
From the factor analyses such as different geographical, shooting parameter, meteorological condition, magnetic anomaly, carrier-borne environment, missile-borne environment, the combination of missile-borne magnetic
The measuring accuracy of attitude measuring is very high and has stronger adaptability.
Embodiment
Technical scheme is described in more detail with reference to specific embodiment.
Missile-borne magnetic assembled gesture measurement apparatus utilizes earth's magnetic field property detection shell rolling information, in terms of its operation principle,
There is following factor to influence its measuring accuracy：Different geographical, shooting parameter, meteorological condition, magnetic anomaly, carrier-borne environment, missile-borne ring
Border etc., the measuring accuracy of missile-borne magnetic assembled gesture measurement apparatus is influenceed lower these factors of surface analysis and its adaptability.
1) the abnormal impact analysis in region magnetic field
Base area magnetic field theory, the intensity of earth magnetism and direction are the functions of position, the geomagnetic element of any point on the earth
(intensity, magnetic declination and magnetic dip angle) only longitude and latitude and height correlation with the ground.For different geographical, satellite fix on bullet is utilized
The shell flight longitude and latitude that device measures in real time can calculate absolute force, magnetic declination and the magnetic dip angle at this, magnetic group on bullet
Close in attitude measuring Processing Algorithm and have modified the influence that magnetic declination and magnetic dip angle test it roll attitude.Base area
Magnetic is theoretical and rolling processing method, magnetic dip angle change 1 °, corresponding rolling benchmark change in different geographical：0.3°-0.8°；Magnetic declination
1 ° of change, corresponding rolling benchmark change in different geographical：0.1°-0.5°；Consider longitude and latitude test error and earth magnetism theoretical calculation
Error, the error of magnetic declination and magnetic dip angle is calculated at present at 0.1 ° or so.According to the theoretical and current different geographical earth magnetism magnetic of earth magnetism
The error that drift angle and magnetic dip angle are influenceed due to environmental magnetic field (underground magnetic iron ore etc.) is substantially within 3 °, corresponding missile-borne magnetic combination appearance
The test error of state measurement apparatus is within ± 2 °.The geomagnetic sensors detection magnetic field range used at present：±6×106Nanotesla,
Within this range, missile-borne magnetic assembled gesture measurement apparatus can be with for the nanotesla of the nanotesla of magnetic field intensity 30000 on global seismic~60000
Adapt to global different geographical.According to earth magnetism is theoretical and pertinent literature, ground magnetic anomaly amplitude distribution between -80~+80 nanoteslas,
The test worst error of corresponding missile-borne magnetic assembled gesture measurement apparatus is within ± 1 °.
For the daily change in earth's magnetic field, global mean change amplitude is annual 80 nanotesla.If earth's magnetic field dipole moment is pressed
Reduce according to current trend and speed, then being reduced to earth's magnetic field south poles and being inverted about needs 700 years or so.Geomagnetic pole
Property inversion process will be about continue year 1000-8000.
Understand that geomagnetic sensors detection magnetic field range is adapted to global different geographical, for the ground of various regions according to analysis
Magnetic anomaly situation seen, the exception of the magnetic field intensity of different geographical earth magnetism, magnetic declination and magnetic dip angle, corresponding missile-borne magnetic assembled gesture is surveyed
The test worst error of device is measured within ± 3 °.
2) shooting parameter impact analysis
The firing angle and directive of shell transmitting have an impact to the measuring accuracy of missile-borne magnetic assembled gesture measurement apparatus.
According to earth magnetism in theory, if directive overlaps with magnetic north direction, the plane of riee overlaps with magnetic north vertical plane, now
Magnetic vector entirely fall within the plane of riee, if trajectory tilt angle again it is identical with magnetic dip angle, earth magnetism is in magnetic sensor assembly Y-axis
Zero is projected as, at this moment will be unable to determine the roll attitude angle of shell.Consider shell flight course in the angle of pitch be from+70 °~-
70 ° of changes, directive overlaps with magnetic north direction and the angle of pitch and magnetic dip angle equal state time are very short, due to missile-borne magnetic assembled gesture
Measurement apparatus has error not accumulative and can recover measurement function quickly in 1 turn, and magnetic assembled gesture measurement apparatus can be with theory
Used in 0 °~360 ° full directives.Consider engineer applied and ensure measuring accuracy, missile-borne magnetic assembled gesture measurement apparatus is visited
The angle for surveying body roll attitude information requirements shell directive and magnetic north is more than more than 1.0 °.
In-flight influence of the change of the angle of pitch and yaw angle to missile-borne magnetic assembled gesture measurement apparatus is according to satellite on bullet
The ballistic inclination angle and course of positioner processing are modified, and its test error is to missile-borne magnetic assembled gesture measurement apparatus
Test error is within 2.0 °.
3) meteorological condition impact analysis
The temperature of spring, summer, autumn and winter Various Seasonal, humidity, atmospheric pressure, wind etc. have certain influence to absolute force.Commonly
In tens nanoteslas, it is abnormal to produce the intensity of 100 nanoteslas when earth magnetism, and appearance is combined to missile-borne magnetic for influence of the climate change to absolute force
The influence of only 1.2 ° or so of the influence of state measurement apparatus measurement accuracy.
From missile-borne magnetic assembled gesture measurement apparatus in the past few years in the Hou Shan target ranges of packet header 447 and 051 base Alxa target range not
Experiment is penetrated with No. tens big guns of season to see, meteorological condition influences very little to missile-borne magnetic assembled gesture measurement apparatus measurement accuracy.
4) impact analysis of magnetic anomaly
Earth's magnetic field is mainly made up of ground nuclear field, lithospheric magnetic field, interference field.Interference field is mainly ionospheric current, ring electricity
Magnetic field caused by stream and magnetopause layer electric current, is mainly influenceed by solar activity.The magnetic field for resulting from the earth's core accounts for earth's magnetic field total amount
More than 95%, the intensity of earth's surface is 30000~60000 nanoteslas on the earth.Anomalous field (is also named earth's crust field), results from magnetization
Crustal rock, little with time change, spatial distribution frequency is enriched, and wavelength is from several meters to thousands of kms, at earth's surface
Intensity takes up an area more than the 4% of magnetic field total amount.In terms of earth magnetism theory, magnetic interference is also only several over the ground in general solar activity change
Ten nanoteslas, when earth magnetism produces the intensity exception of 100 nanoteslas, the influence to missile-borne magnetic assembled gesture measurement apparatus measurement accuracy only has
1.2 ° or so of influence.When sun surface activity is vigorous, the sudden strain of a muscle flame on sun surface can give off X ray, ultraviolet when dodging flame outburst
The proton and electron beam of line, visible ray and high-energy, the rush of current magnetic field of the earth that charged particle therein is formed, trigger shortwave
The alleged magnetic storm of communication.When magnetic storm is divided into weak, medium, strong, strong, huge five class, corresponding magnetic storm it is sudden and violent when change be respectively：30 nanoteslas,
50 nanoteslas, 100 nanoteslas, 200 nanoteslas, 350 nanoteslas.During corresponding 1957-1993, occur per annual weak magnetic it is sudden and violent 13 times, in
Magnetic storm 9 times, strong magnetic storm 6 times, strong magnetic storm 1 time, and just generation is once for average every 6 years of huge magnetic storm.Huge magnetic storm combines appearance to missile-borne magnetic
The measuring accuracy of state measurement apparatus is influenceed within ± 5 °.Magnetic storm amplitude reaches more than thousand nanoteslas, shadow that theoretically can be larger
Ring the measuring accuracy (more than 10 ° errors) to missile-borne magnetic assembled gesture measurement apparatus.Magnetic storm time, which can strengthen in air, simultaneously ionizes
Freeization of layer, can produce normal signal when noise covers communication, or even make communicating interrupt, it is also possible to produce high-tension bus-bar
Moment super-pressure, power breakdown is caused, airborne vehicle can also be damaged.Under the conditions of huge magnetic storm, the measurement of missile-borne magnetic assembled gesture
Can device normal work also difficult determination.Should using bullet on geomagnetic sensor such as in extended gliding range guided cartridge engineering product
With, it is proposed that without using the guided cartridge under the huge magnetic storm specified conditions of the sun.
5) impact analysis of carrier-borne environment
701 priorities have organized the device usability test under electromagnetic environment on 2 simulation warships in Nanjing, Wuhan, warp
Verify that missile-borne magnetic assembled gesture measurement apparatus is working properly.Missile-borne magnetic assembled gesture measurement apparatus passes through in experiment is applied at present
Energy normal work, does not influence measurement accuracy under the various radar illumination in 051 target range.
6) impact analysis of missile-borne environment
Adaptation for armament systems electromagnetic environment, general electric steering engine is as control execution system, and in-flight electric current can
Up to 10A or so, certain electromagnetic interference can be produced.When armament systems design, anti-electromagnetic-radiation isolation material is employed in steering gear flat
Material；Missile-borne magnetic assembled gesture measurement apparatus specially devises anti-electromagnetic interference circuit when designing；Missile-borne magnetic assembled gesture is surveyed simultaneously
Device is measured with steering gear electric-machine distance in more than 200mm.Penetrated from the debugging of current ground and big gun in terms of flight test result, the combination of missile-borne magnetic
Attitude measuring is not significantly interfered with, is well adapted for this bullet electromagnetic environment.
The foregoing is only a preferred embodiment of the present invention, protection scope of the present invention not limited to this, any ripe
Those skilled in the art are known in the technical scope of present disclosure, the letter for the technical scheme that can be become apparent to
Altered or equivalence replacement are each fallen within protection scope of the present invention.
Claims (1)
1. the adaptability analysis method that bullet is applied in a kind of missile-borne magnetic assembled gesture measurement apparatus, it is characterised in that including following
Step：
1) the abnormal impact analysis in region magnetic field
Base area magnetic field theory, the intensity of earth magnetism and direction are the functions of position, on the earth geomagnetic element of any point only with
The longitude and latitude and height correlation on the ground；For different geographical, the shell measured in real time using satellite positioning device on bullet, which is flown, to pass through
Latitude calculates absolute force, magnetic declination and the magnetic dip angle at this, on bullet in magnetic assembled gesture measurement apparatus Processing Algorithm
It has modified the influence that magnetic declination and magnetic dip angle test it roll attitude；According to earth magnetism theory and rolling processing method, magnetic dip angle
1 ° of change, corresponding rolling benchmark change in different geographical：0.3°-0.8°；Magnetic declination changes 1 °, corresponding rolling base in different geographical
Quasi- change：0.1°-0.5°；Consider longitude and latitude test error and earth magnetism theory error, calculate magnetic declination and magnetic dip angle at present
Error at 0.1 °；The mistake influenceed according to the theoretical and current different geographical earth magnetism magnetic declination of earth magnetism and magnetic dip angle due to environmental magnetic field
Difference is substantially within 3 °, and the test error of corresponding missile-borne magnetic assembled gesture measurement apparatus is within ± 2 °；The earth magnetism used at present
Sensor detects magnetic field range：±6×106Nanotesla, the nanotesla of the nanotesla of magnetic field intensity 30000 on global seismic~60000 is herein
In the range of, missile-borne magnetic assembled gesture measurement apparatus adapts to global different geographical；According to earth magnetism theory and pertinent literature, ground magnetic anomaly
Normal amplitude distribution between -80~+80 nanoteslas, the test worst error of corresponding missile-borne magnetic assembled gesture measurement apparatus ± 1 ° with
It is interior；
For the daily change in earth's magnetic field, global mean change amplitude is annual 80 nanotesla；If earth's magnetic field dipole moment according to work as
Preceding trend and speed reduce, then being reduced to earth's magnetic field south poles and being inverted needs 700 years；Geomagnetic polarity reversal process
Continue year 1000-8000；
Learnt according to analysis, geomagnetic sensors detection magnetic field range adapts to global different geographical, the magnetic anomaly for various regions
Situation sees, the exception of the magnetic field intensity of different geographical earth magnetism, magnetic declination and magnetic dip angle, corresponding missile-borne magnetic assembled gesture measurement apparatus
Test worst error within ± 3 °；
2) shooting parameter impact analysis
The firing angle and directive of shell transmitting have an impact to the measuring accuracy of missile-borne magnetic assembled gesture measurement apparatus；
According to earth magnetism in theory, if directive overlaps with magnetic north direction, the plane of riee overlaps with magnetic north vertical plane, magnetic now
Vector is entirely fallen within the plane of riee, if trajectory tilt angle, earth magnetism projection in magnetic sensor assembly Y-axis identical with magnetic dip angle again
It is zero, at this moment will be unable to determine the roll attitude angle of shell；Consider that the angle of pitch is from+70 °~-70 ° changes in shell flight course
Change, directive overlaps with magnetic north direction and the angle of pitch and magnetic dip angle equal state time are very short, because missile-borne magnetic assembled gesture measures
Device has error not accumulative and can recover measurement function quickly in 1 turn, in theory magnetic assembled gesture measurement apparatus can 0 °~
Used in 360 ° of full directives；Consider engineer applied and ensure measuring accuracy, missile-borne magnetic assembled gesture measurement apparatus detection body
The angle of roll attitude information requirements shell directive and magnetic north is more than more than 1.0 °；
In-flight influence of the change of the angle of pitch and yaw angle to missile-borne magnetic assembled gesture measurement apparatus is according to satellite fix on bullet
The ballistic inclination angle and course of device processing are modified, test of its test error to missile-borne magnetic assembled gesture measurement apparatus
Error is within 2.0 °；
3) meteorological condition impact analysis
The temperature of spring, summer, autumn and winter Various Seasonal, humidity, atmospheric pressure, wind have certain influence to absolute force；Ordinary climate becomes
Change influence to absolute force in tens nanoteslas, it is abnormal to produce the intensity of 100 nanoteslas when earth magnetism, and missile-borne magnetic assembled gesture is measured
The influence of only 1.2 ° of the influence of measurement device precision；
From missile-borne magnetic assembled gesture measurement apparatus in the past few years in the Hou Shan target ranges of packet header 447 and 051 base Alxa target range difference season
No. tens big guns of section are penetrated experiment and seen, meteorological condition influences very little to missile-borne magnetic assembled gesture measurement apparatus measurement accuracy；
4) impact analysis of magnetic anomaly
Earth's magnetic field is mainly made up of ground nuclear field, lithospheric magnetic field, interference field；Interference field be mainly ionospheric current, circular current and
Magnetic field caused by magnetopause layer electric current, is mainly influenceed by solar activity；Take up an area the 95% of magnetic field total amount in the magnetic field for resulting from the earth's core
More than, the intensity of earth's surface is 30000~60000 nanoteslas on the earth；Anomalous field results from magnetized crustal rock, little with
Time change, spatial distribution frequency are enriched, and for wavelength from several meters to thousands of kms, the intensity at earth's surface takes up an area magnetic field total amount
More than 4%；In terms of earth magnetism theory, magnetic interference also only has tens nanoteslas over the ground in general solar activity change, when earth magnetism produces
The intensity of 100 nanoteslas is abnormal, the influence of only 1.2 ° of the influence to missile-borne magnetic assembled gesture measurement apparatus measurement accuracy；Work as the sun
Surface activity is vigorous, and the sudden strain of a muscle flame on sun surface dodges the matter that X ray, ultraviolet, visible ray and high-energy can be given off during flame outburst
Son and electron beam, the rush of current magnetic field of the earth that charged particle therein is formed, trigger the magnetic storm alleged by short wave communication；Work as magnetic storm
Be divided into weak, medium, strong, strong, huge five class, corresponding magnetic storm it is sudden and violent when change be respectively：30 nanoteslas, 50 nanoteslas, 100 nanoteslas, 200 are received
Special, 350 nanoteslas；During corresponding 1957-1993, occur that weak magnetic is sudden and violent 13 times, middle magnetic storm 9 times, strong magnetic storm 6 times, strong per annual
Magnetic storm 1 time, and huge magnetic storm just occurs once for average every 6 years；Measuring accuracy of the huge magnetic storm to missile-borne magnetic assembled gesture measurement apparatus
Influence within ± 5 °；Magnetic storm amplitude reaches more than thousand nanoteslas, theoretically can large effect to missile-borne magnetic assembled gesture survey
Measure the measuring accuracy of device；Magnetic storm time can strengthen freeization in ionosphere in air simultaneously, when can produce noise and covering communication
Normal signal, or even make communicating interrupt, or high-tension bus-bar is produced moment super-pressure, power breakdown is caused, also can be to aviation
Device damages；Under the conditions of huge magnetic storm, can missile-borne magnetic assembled gesture measurement apparatus normal work also difficult determination；Such as increase in gliding
Using bullet application on geomagnetic sensor in journey guided cartridge engineering product, it is proposed that without using this under the huge magnetic storm specified conditions of the sun
Guided cartridge；
5) impact analysis of carrier-borne environment
701 priorities have organized the device usability test under electromagnetic environment, empirical tests on 2 simulation warships in Nanjing, Wuhan
Missile-borne magnetic assembled gesture measurement apparatus is working properly；At present missile-borne magnetic assembled gesture measurement apparatus experiment apply in through 051 target
Energy normal work, does not influence measurement accuracy under the various radar illumination in field；
6) impact analysis of missile-borne environment
Adaptation for armament systems electromagnetic environment, general electric steering engine reach 10A as control execution system, in-flight electric current,
Certain electromagnetic interference can be produced；When armament systems design, anti-electromagnetic-radiation isolated material is employed in steering gear flat；Missile-borne magnetic group
Anti-electromagnetic interference circuit is specially devised when closing attitude measuring design；Missile-borne magnetic assembled gesture measurement apparatus and steering wheel simultaneously
Motor distance is in more than 200mm.
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| CN107941090B (en) * | 2017-11-03 | 2019-07-12 | 莱诺斯科技（北京）股份有限公司 | Modularization body real time on-line monitoring and emission control integrated information platform |
| CN109032100B (en) * | 2018-09-21 | 2019-11-29 | 北京广利核系统工程有限公司 | A method of identification npp safety grade I&C system equipment applicability |
| CN110044321B (en) * | 2019-03-22 | 2021-01-29 | 北京理工大学 | Method for resolving aircraft attitude by using geomagnetic information and angular rate gyroscope |
| CN110007350B (en) * | 2019-04-15 | 2020-08-25 | 哈尔滨工业大学 | Analysis method for magnetic detection method blind area |
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| CN104820248A (en) * | 2015-05-03 | 2015-08-05 | 国家海洋局第一海洋研究所 | Ship-borne magnetic force detection method and device |
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| CN2773610Y (en) * | 2005-03-30 | 2006-04-19 | 陕西老枪靶业有限公司 | Pathway parameter measuring device |
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