CN110018360A - A kind of Real-time Feedback electromagnetic field DF antenna system - Google Patents
A kind of Real-time Feedback electromagnetic field DF antenna system Download PDFInfo
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- CN110018360A CN110018360A CN201910348999.1A CN201910348999A CN110018360A CN 110018360 A CN110018360 A CN 110018360A CN 201910348999 A CN201910348999 A CN 201910348999A CN 110018360 A CN110018360 A CN 110018360A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0842—Measurements related to lightning, e.g. measuring electric disturbances, warning systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0871—Complete apparatus or systems; circuits, e.g. receivers or amplifiers
Abstract
The invention discloses a kind of Real-time Feedback electromagnetic field DF antenna systems, belong to electromagnetic field direction finding technology field, are used for thunder and lightning signal detection.System is divided into 4 parts: magnetic rod antenna intersects magnetic loop antenna, intelligent terminal and optical transmission device.The probe algorithm of the Adaptive background subtraction of intelligent terminal, the average amplitude by calculating the past period background signal have the advantages of reduction false alarm rate, raising toggle rate as trigger threshold.Self-checking algorithm chooses appropriate error range by the error by east the sum of with the response of two groups of magnetic loop antennas to the west between calculating and the response of north-south magnetic loop antenna, the direction finding data reliability judged, and realizes the function of real-time monitoring system status of equipment.Final data is transmitted through the optical fiber to network data base by optical transmission device, prevents from being interfered in data transmission procedure by bad electromagnetic environment, and can pass through network real time inspection data information.
Description
Technical field
The present invention relates to a kind of Real-time Feedback electromagnetic field DF antenna systems, belong to electromagnetic field direction finding technology field, are used for
Thunder and lightning signal detection.
Background technique
Thunder and lightning is a kind of common weather phenomenon of nature, and especially in Mid-low latitude region, China is the more of Lightning Disaster
Send out area.The main genesis mechanism of thunder and lightning is when thundercloud layer is close to the earth, and ground induces opposite charges, when charge buildup to one
Determine degree, generate between cloud and cloud and discharge between cloud and the earth, set out out light harmony the phenomenon that.According to the different shape of thunder and lightning,
It is broadly divided into sheet, threadiness and spherical three kinds of forms；From endanger angle consider, thunder and lightning can be divided into direct lightning strike, inductive lightning (including
Electrostatic induction and electromagnetic induction) and spherical thunder.Divide from the mechanism of thundercloud generation, there is hot thunder, boundary's thunder and low pressure thunder.Thunder and lightning
Not only result in the damage of the electrical equipments such as generator, transformer, breaker, insulator；But also fire can be caused, physics is broken
The construction materials such as bad timber, concrete.Therefore there is very strong realistic meaning to the direction finding of thunder and lightning signal.
The patent of invention " a kind of device 201510562865.1 for lighting location " of existing same type, in lightening detection
The scheme positioned to thunder and lightning an of electric field antenna is added to realize determining for thunder and lightning signal using two magnetic field antennas in device
Bit function.This scheme is big by background electromagnetic effect of signals, and detectivity is low.
Summary of the invention
The purpose of the present invention is overcome, detection spirit big by background electromagnetic effect of signals to thunder and lightning signal direction-finding in the prior art
The low deficiency of sensitivity provides a kind of Real-time Feedback electromagnetic field DF antenna system for thunder and lightning signal detection, by magnet ring
The design of antenna realizes the accuracy for guaranteeing angle recognition under the conditions of highly sensitive, devises and is calculated according to the self-test of signal response
Method realizes the self-checking function of system accuracy reliability judgement.
The technical solution adopted by the present invention is using the placement magnetic rod antenna in glass fibre reinforced plastic cover and three groups of intersection magnetic in 60 ° of angles
Loop antenna obtains electricity, magnetic signal, and magnetic rod antenna is placed in vertically upward to intersect right above magnetic loop antenna, and signal is coaxial by short-term
Cable is directly inputted to the intelligent terminal in shielding box；Intelligent terminal realizes electromagnetism using the probe algorithm of Adaptive background subtraction
The intelligent recognition and analysis of signal, the self-checking algorithm for using signal to respond realize the judgement of system accuracy reliability to guarantee direction finding
As a result accuracy；The direction finding result of acquisition is finally uploaded database through optical fiber by optical transmission device by intelligent terminal；User
Can in the equipment of networking real time inspection information.
Real-time Feedback electromagnetic field DF antenna system of the invention includes glass fibre reinforced plastic cover 1, magnetic rod antenna 2, intersects magnet ring day
Line 3, short-term coaxial cable 4, shielding box 5, intelligent terminal 6, optical transmission device 7, optical fiber 8 and database server 9；In glass reinforced plastic
Magnetic rod antenna 2 and three intersection magnetic loop antennas 3 in 60 ° of angles are placed in cover 1, magnetic rod antenna 2 is placed in intersection magnetic vertically upward
Right above loop antenna 3, magnetic rod antenna 2 and intersection magnetic loop antenna 3 obtain electricity, magnetic signal respectively；Electricity, the magnetic signal of acquisition pass through short
Line coaxial cable 4 is directly inputted to the intelligent terminal 6 in shielding box 5；Intelligent terminal 6 finally leads to the direction finding result of acquisition
It crosses optical transmission device 7 and uploads database 9 through optical fiber 8；
Intelligent terminal 6 includes AD conversion module 10, the probe algorithm module 11 of Adaptive background subtraction and self-checking algorithm module 12,
AD conversion module 10 receives the electromagnetic signal output digit signals of short-term coaxial cable, and gained digital signal is defeated via GPIO interface
Enter the probe algorithm module 11 to Adaptive background subtraction, 11 output end of probe algorithm module of Adaptive background subtraction by GPIO interface with
Self-checking algorithm module 12 connects, and self-checking algorithm module 12 is connect with optical transmission device 7；
Intelligent terminal 6 realizes the intelligent recognition and analysis of electromagnetic signal by the probe algorithm module 11 of Adaptive background subtraction,
The self-checking algorithm module 12 responded by signal realizes the judgement of system accuracy reliability to guarantee the accuracy of direction finding result.
Steps are as follows for 11 probe algorithm of probe algorithm module of Adaptive background subtraction of the present invention:
Step 1: the signal that the 11 dynamic memory time in the past magnetic field antenna of probe algorithm module of Adaptive background subtraction receives
Amplitude；
Step 2: the probe algorithm module 11 of Adaptive background subtraction connect the magnetic field antenna of time in the past in memory every 15 seconds
Collection of letters range value carries out mean value computation, and using the average value acquired as signal trigger threshold；
Step 3: 11 moment of the probe algorithm module recording magnetic field signal of Adaptive background subtraction, electric field signal amplitude work as reception
When the magnetic field signal amplitude arrived is more than or equal to the 120% of trigger threshold, judgement detects a thunder and lightning signal；Conversely, then determining
For environment electromagnetic noise；
Step 4: for thunder and lightning signal, thunder and lightning direction being judged according to magnetic field signal, electric field signal judges thunder and lightning polarity, eliminates
The ambiguity in thunder and lightning direction；
Step 5: output thunder and lightning source direction；
Steps are as follows for 12 self-checking algorithm of self-checking algorithm module of the present invention:
Step 1: self-checking algorithm module 12 is asynchronous when the judgement of each Adaptive background subtraction probe algorithm detects thunder and lightning signal
It executes, remembers that magnetic field antenna signal amplitude in direction by east is V1, North and South direction magnetic field antenna signal amplitude is V2, direction magnetic field to the west
The signal amplitude of antenna is V3；
Step 2: calculating the sum of magnetic field antenna signal amplitude in direction by east and magnetic field antenna signal amplitude in direction to the west and south
North orientation magnetic field antenna signal amplitude ratio, i.e. λ=(V1+V3)/V2；
Step 3: judging the size of ratio λ, when the value of λ is 95~105%, determine the magnetic field day of the lightening detection equipment
Linear condition is normal, and probe value is authentic and valid；Conversely, then determine that the magnetic field antenna situation of the lightening detection equipment is abnormal, probe value
Lack reference value；
Step 4: the Boolean variable of an expression equipment state is saved in self-checking algorithm module 12, the value of the variable is according to λ
Value and change, when the value of λ is 95~105%, then the variable be "true"；Conversely, being then "false".
The intersection magnetic loop antenna 3 includes three identical magnetic loop antennas, and three identical magnetic loop antennas are with magnet ring institute
It intersects in the center line of plane for axis, the angle intersected between each face of magnetic loop antenna 3 is 60 °, and the level of each magnet ring is high
Degree is in sustained height.
The magnetic rod antenna 2 uses manganese-zinc ferrite magnetic rod antenna, and diameter is not less than 10mm, and length is 80~120mm.
Beneficial effects of the present invention: the antenna System Design is reasonable, by magnetic rod antenna, intersects magnetic loop antenna, intelligent terminal
It is integrated with optical transmission device, the length of the short-term coaxial cable of shortening electromagnetic signal to intelligent terminal, to reduce back to the greatest extent
The interference of scape noise.It is transmitted by optical fiber, also effectively prevents the interference of extraneous severe electromagnetic noise.Adaptive background subtraction algorithm
The Rational choice of parameter substantially increases the accuracy of aspect judgement, under the false triggering rate caused due to environment electromagnetic noise
Drop 90%.The Rational choice of self-checking algorithm threshold value ensure that the reliability of system direction finding result, make magnetic field antenna angle measurement
Deviation is within 1.5 °.The system also achieves the function of remote monitoring system status of equipment.
Detailed description of the invention
The schematic illustration of Fig. 1 Real-time Feedback electromagnetic field DF antenna system
In figure: 1- glass fibre reinforced plastic cover, 2- magnetic rod antenna, 3- intersect magnetic loop antenna, 4- short-term coaxial cable, 5- shielding box, 6-
Intelligent terminal, 7- optical transmission device, 8- optical fiber, 9- database.
The structure composition enlarged drawing of Fig. 2 intelligent terminal 6
In figure: 10-AD conversion module, 11- Adaptive background subtraction algoritic module, 12- self-checking algorithm module.
The frequency response chart of the orthogonal magnetic loop antenna of Fig. 3
In figure: ordinate is amplitude response, and unit dB, abscissa is frequency, unit Hz.
Specific embodiment
With reference to the accompanying drawing, the invention will be further described for specific embodiment.
Embodiment 1
As shown in Figure 1, Real-time Feedback electromagnetic field DF antenna system contains magnetic rod antenna 2, intersects magnetic loop antenna 3, intelligence
Except the main components such as energy terminal 6 and optical transmission device 7, glass fibre reinforced plastic cover 1, short-term coaxial cable 4,5 and of shielding box are further comprised
The accessories such as optical fiber 8.
The outer dimension diameter of glass fibre reinforced plastic cover 1 is 150mm, and height is 150mm, and wall thickness is 3mm；Glass fibre reinforced plastic cover 1 and shielding
IP6 waterproof is formed by sealing ring between box 5.
Magnetic rod antenna 2 use manganese-zinc ferrite body length L=0.08m, use diameter for the enameled wire multilayer of 0.1mm it is close around
100 circles, use wax fixed coil；The fitting encapsulation of 2 external application PVC material of magnetic rod antenna, interface use SMA interface.Magnetic rod antenna 2 is pacified
Right above intersection magnetic loop antenna 3.
Intersecting the area that each magnet ring of magnetic loop antenna 3 is chosen is S=0.2025m2, the number of turns N=50, matching impedance is
500 Ω intersect by axis of the center line of plane where magnet ring, and the angle between each face is 60 °, at the level height of each magnet ring
In sustained height.In outfield in the case where E=1V/m, the frequency response of orthogonal magnetic loop antenna 3 is as shown in Figure 2.Intersect magnet ring day
Line 3 uses diameter close around 50 circles for the enameled wire of 0.3mm；Basic framework is made of the side's 10mm copper bar.In order to be carried out to clutter
It preferably shields, the use side copper Fang Huan red copper item is obtained through fluting processing, and slot width 2mm, deep 6mm, it is ensured that outside enameled wire
Copper side's ring wall thickness is above 1mm.The recessing of each magnetic loop antenna contact site joins and is in sustained height as far as possible, and junction is adopted
It is isolated with raw material band.
4 length L=10cm of short-term coaxial cable.
Intelligent terminal 6 is based on ARM platform, and master chip model is STM32f103ZET6；Passed through using short-term coaxial cable 4
The A/D chip of the GPIO control SPI interface of intelligent terminal 6 carries out signal processing and analysis.Adaptive background subtraction algorithm and self-checking algorithm are burnt
It writes in 6 chip of intelligent terminal.
The probe algorithm of Adaptive background subtraction comprises the steps of:
Step 1,11 dynamic memory of algoritic module of Adaptive background subtraction goes over the signal width that 2 minutes magnetic field antennas receive
Degree；
Step 2, the algoritic module 11 of Adaptive background subtraction received letter to 2 minutes magnetic field antennas are pass by memory every 15 seconds
Number range value carries out mean value computation, and using the average value acquired as signal trigger threshold；
Step 3,11 moment of the algoritic module recording magnetic field signal of Adaptive background subtraction, electric field signal amplitude, when what is received
When magnetic field signal amplitude is more than or equal to the 120% of trigger threshold, judgement detects a thunder and lightning signal.Conversely, being then determined as ring
Border electromagnetic noise；
Step 4, for thunder and lightning signal, thunder and lightning direction is judged according to magnetic field signal, electric field signal judges thunder and lightning polarity, eliminates
The ambiguity in thunder and lightning direction；
Step 5, thunder and lightning source direction is exported；
Self-checking algorithm comprising the steps of:
Step 1, self-checking algorithm module 12 detected thunder and lightning signal in the judgement of Adaptive background subtraction probe algorithm every 24 hours
When asynchronous execution, remember magnetic field antenna signal amplitude in direction by east be V1, North and South direction magnetic field antenna signal amplitude is V2, side to the west
It is V to the signal amplitude of magnetic field antenna3；
Step 2, the sum of magnetic field antenna signal amplitude in direction by east and magnetic field antenna signal amplitude in direction to the west and south are calculated
North orientation magnetic field antenna signal amplitude ratio, i.e. λ=(V1+V3)/V2；
Step 3, the size for judging ratio λ determines that the lightening detection is set when the value of λ is when section (95%, 105%) is interior
Standby magnetic field antenna situation is normal, and probe value is authentic and valid.Conversely, then determining the magnetic field antenna situation of the lightening detection equipment
Abnormal, probe value lacks reference value；
Step 4, the Boolean variable of an expression equipment state is saved in self-checking algorithm module 12, the value of the variable is according to λ
Value and change, when the value of λ is when section (95%, 105%) is interior, which is "true".Conversely, being then "false".
Shielding box 5 uses anode aluminium entirety tunneling technology, and wall thickness 3mm is electromagnetically shielded intelligent terminal 6.Shielding
5 upper end of box is that three SMA females connect magnetic rod antenna 2 by short-term coaxial cable 4 and intersect the signal input of magnetic loop antenna 3；
By treated, electric data-signal is converted to optical signal to optical transmission device 7 built in shielding box 5, is sent to database via optical fiber 8.
Lightning electromagnetic signal is come eventually for the Real-time Feedback electromagnetic field DF antenna system of thunder and lightning signal detection
Wave direction realizes measurement accuracy of the root mean square less than 1.5 °.
A kind of Real-time Feedback electromagnetic field DF antenna system for thunder and lightning signal detection disclosed by the invention, is respectively adopted
Magnetic rod antenna 2 detects the polarity of electromagnetic signal, intersects the orientation that magnetic loop antenna 3 precisely detects electromagnetic signal；Intelligent terminal 6 is straight
Connect be placed in close distance below antenna overcome signal transmit brought by noise；The electromagnetic signal direction finding of Adaptive background subtraction is calculated
Method realizes the detection to small-signal, since the false triggering rate that environment electromagnetic noise causes has dropped 90%.；Self-checking algorithm is real
The judgement for having showed direction finding angle reliability ensure that magnetic field antenna angle measurement is inclined when equipment state Boolean variable is "true"
Difference is within 1.5 °；Optical fiber 8, which transmits data to database 9, realizes the real-time monitoring of electromagnetic signal.
Claims (5)
1. a kind of Real-time Feedback electromagnetic field DF antenna system, it is characterised in that the system includes glass fibre reinforced plastic cover (1), magnetic rod antenna
(2), intersect magnetic loop antenna (3), short-term coaxial cable (4), shielding box (5), intelligent terminal (6), optical transmission device (7), optical fiber
(8) and database server (9)；Magnetic rod antenna (2) and three intersection magnet ring days in 60 ° of angles are placed in glass fibre reinforced plastic cover (1)
Line (3), magnetic rod antenna (2) is placed in vertically upward to intersect right above magnetic loop antenna (3), magnetic rod antenna (2) and intersection magnet ring day
Line (3) obtains electricity, magnetic signal respectively；Electricity, the magnetic signal of acquisition are directly inputted to by short-term coaxial cable (4) positioned at shielding box
(5) intelligent terminal (6) in；The direction finding result of acquisition is finally passed through optical transmission device (7) through optical fiber (8) by intelligent terminal (6)
It uploads database (9)；
Intelligent terminal (6) includes AD conversion module (10), the probe algorithm module (11) of Adaptive background subtraction and self-checking algorithm module
(12), AD conversion module (10) receive short-term coaxial cable electromagnetic signal output digit signals, gained digital signal via
GPIO interface is input to the probe algorithm module (11) of Adaptive background subtraction, probe algorithm module (11) output end of Adaptive background subtraction
It is connect by GPIO interface with self-checking algorithm module (12), self-checking algorithm module (12) is connect with optical transmission device (7)；
Intelligent terminal (6) realizes the intelligent recognition and analysis of electromagnetic signal by the probe algorithm module (11) of Adaptive background subtraction,
The self-checking algorithm module (12) responded by signal realizes the judgement of system accuracy reliability to guarantee the accuracy of direction finding result.
2. Real-time Feedback electromagnetic field DF antenna system according to claim 1, it is characterised in that: the spy of Adaptive background subtraction
Steps are as follows for method of determining and calculating module (11) probe algorithm:
Step 1: the signal width that probe algorithm module (11) dynamic memory time in the past magnetic field antenna of Adaptive background subtraction receives
Degree；
Step 2: the probe algorithm module (11) of Adaptive background subtraction received the magnetic field antenna of time in the past in memory every 15 seconds
Signal amplitude value carries out mean value computation, and using the average value acquired as signal trigger threshold；
Step 3: probe algorithm module (11) moment recording magnetic field signal of Adaptive background subtraction, electric field signal amplitude, when receiving
Magnetic field signal amplitude be more than or equal to trigger threshold 120% when, judgement detect a thunder and lightning signal；Conversely, being then determined as
Environment electromagnetic noise；
Step 4: for thunder and lightning signal, thunder and lightning direction being judged according to magnetic field signal, electric field signal judges thunder and lightning polarity, eliminates thunder and lightning
The ambiguity in direction；
Step 5: output thunder and lightning source direction.
3. Real-time Feedback electromagnetic field DF antenna system according to claim 1, it is characterised in that self-checking algorithm module
(12) steps are as follows for self-checking algorithm:
Step 1: self-checking algorithm module (12) is asynchronous when the judgement of each Adaptive background subtraction probe algorithm detects thunder and lightning signal to be held
Row remembers that magnetic field antenna signal amplitude in direction by east is V1, North and South direction magnetic field antenna signal amplitude is V2, direction magnetic field day to the west
The signal amplitude of line is V3；
Step 2: calculating the sum of magnetic field antenna signal amplitude in direction by east and magnetic field antenna signal amplitude in direction to the west and north-south
Magnetic field antenna signal amplitude ratio, i.e. λ=(V1+V3)/V2；
Step 3: judging the size of ratio λ, when the value of λ is 95~105%, determine the magnetic field antenna shape of the lightening detection equipment
Condition is normal, and probe value is authentic and valid；Conversely, then determining that the magnetic field antenna situation of the lightening detection equipment is abnormal, probe value lacks
Reference value；
Step 4: the Boolean variable of an expression equipment state is saved in self-checking algorithm module (12), the value of the variable is according to λ's
It is worth and changes, when the value of λ is 95~105%, then the variable is "true"；Conversely, being then "false".
4. high-precision Real-time Feedback electromagnetic field DF antenna system according to claim 1, it is characterised in that: the friendship
Pitching magnetic loop antenna (3) includes three identical magnetic loop antennas, and three identical magnetic loop antennas are with the center line of plane where magnet ring
It intersects for axis, the angle between magnetic loop antenna (3) each face is 60 °, and the level height of each magnet ring is in sustained height.
5. Real-time Feedback electromagnetic field DF antenna system according to claim 1, it is characterised in that: the magnetic rod antenna
(2) manganese-zinc ferrite magnetic rod antenna is used, diameter is not less than 10mm, and length is 80~120mm.
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| CN201910348999.1A CN110018360A (en) | 2019-04-28 | 2019-04-28 | A kind of Real-time Feedback electromagnetic field DF antenna system |
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| CN201910348999.1A CN110018360A (en) | 2019-04-28 | 2019-04-28 | A kind of Real-time Feedback electromagnetic field DF antenna system |
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Cited By (1)
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| CN114518533A (en) * | 2022-04-21 | 2022-05-20 | 山东科技大学 | Hybrid direct-current circuit breaker locking time measuring method based on electromagnetic field synchronous measurement |
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