CN103197175A - Confirming method of same frequency multiple interference for electromagnetic coupling weak path - Google Patents
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Abstract
The invention discloses a confirming method of same frequency multiple interference for an electromagnetic coupling weak path, and belongs to the technical field of electromagnetic compatibility. Electromagnetic coupling relations of a plurality of interference sources and a plurality of sensitive points in a system are translated into digraphs, and sides of the coupling digraphs are valued through simulation and testing; then coupling paths where interference can be most easily generated between each interference source and each sensitive body are found from an electromagnetic coupling network in the same valued coupling digraph through a shortest-path tracking method for a plurality of times; and finally the same interference coupling path is extracted form a weak path from the each interference source to the each sensitive body, key rectification is conducted aiming at the weak path of repeated coupling, and therefore maintenance and strengthening of system electromagnetic compatibility faults are efficiently and accurately achieved, and electromagnetic compatibility problems can be accurately and effectively solved with low cost.
Description
Technical field
The invention belongs to the electromagnetic compatibility technology field, relate to a kind of electromagnetic compatibility weak route method that is coupled of seeking between with frequently many interference sources and many sensitive spots, or rather, be a kind of with the many jamming equipments in frequency place to the weak Path Determination method of electromagnetic coupled.
Background technology
In the collaborative work of a plurality of electronic equipments, the electromagnetic interference (EMI) that a certain equipment produces can be coupled on another equipment by conduction emission (CE) and radiation emission (RE) mode, causes the decline of another equipment performance, even can't operate as normal.Along with integrated degree and the complicacy of electronic system increases day by day, the electromagnetic coupled relation between jamming equipment and sensitive equipment is also increasingly sophisticated, and undesired signal can arrive sensitive body and its is produced interference by many coupling paths.Along with the increase of integrated degree, the interference source in the individual system may can produce a plurality of sensitive body in the system and disturb simultaneously from a plurality of equipment.In system, seek out the interference and coupling weak link between many interference sources and the many sensitive body, rectification and the reinforcing of system's electromagnetic compatibility problem had important directive significance.
Summary of the invention
In design and the rectification stage of electronic system, for can be quick, accurately, the effectively reinforcing of realization system electromagnetic compatibility fault or hidden danger, the present invention is by being converted into digraph with a plurality of interference sources in the system and the relation of the electromagnetic coupled between a plurality of sensitive spot, and use emulation and test that assignment is carried out on the limit of coupling digraph, the method that repeatedly adopts shortest path to track in same assignment coupling digraph is sought out the coupling path that the easiest generation is disturbed between each interference source and the sensitive body in the electromagnetic coupled network then, extract identical interference and coupling highway section the weak path from each interference source to sensitive body at last, and it is carry out emphasis at the weak highway section of repeating to be coupled and rectify and improve, thereby efficient, reparation and the reinforcing of system's electromagnetic compatibility mal function have been realized accurately.
The present invention by will disturb more to coupled relation be converted into digraph, and the method that adopts shortest path to track has solved and relies on experience pointwise investigation specific aim not strong in the past, the problem that wastes time and energy.The content that this method is sought crucial coupling path comprises the following steps:
The first step: under the known situation of interference source and sensitive spot, according to circuit theory diagrams and the fundamental diagram of system classified in intrasystem interference and coupling path, obtain in the system disturb to the electromagnetic interference (EMI) coupling network;
Second step: the system that the first step is obtained disturb between electromagnetic interference (EMI) coupling network (abbreviation coupling network) convert electromagnetic interference (EMI) coupling digraph (abbreviation digraph) to;
The 3rd step: the branch according to degree and the digraph on digraph summit, carry out abbreviation to digraph;
The 4th step: utilize the method for emulation and test to obtain between each device port of system at the interfering energy loss value that disturbs the frequency place, and utilize loss value that assignment is carried out on the limit of digraph.
The 5th step: adopt dijkstra's algorithm to determine that every pair of interference source is to the shortest path between sensitive spot in the digraph.
The 6th step: the shortest path that obtains in the 5th step is rectified and improved and reinforcement measure, be specially:
(1) for each sensitive spot, in shortest path, finds all interference sources to the lap of this sensitive spot, and lap is rectified and improved and reinforced;
(2) for each interference source, in shortest path, find this interference source to the lap of all sensitive spots, and lap is rectified and improved and reinforced;
(3) to there not being the shortest path in overlapping highway section, consider that each node on this shortest path is rectified and improved and reinforced.
The 7th step repeated～the six step of the 4th step, met the requirements up to the electromagnetic interference (EMI) coupling.
The present invention is based on the different paths electromagnetic energy loss in the coupling network of sensitive spot of frequency place interference source and vary in size, by the right coupling path of many interference is carried out optimizing, find out each to disturbing a coupling path of energy loss minimum, and to there being overlapping coupling highway section to carry out the emphasis rectification, its advantage is:
(1) at the electromagnetic compatibility interference problem of electric room, in the electromagnetic interference (EMI) coupling network, seek out interference to a path of energy loss minimum, the rectification of system's Electro Magnetic Compatibility is had more specific aim.
(2) by the electromagnetic coupled network is converted into the coupling digraph, coupling seek out in the digraph disturb to weak coupling path, and emphasis is carried out in the overlapping highway section of each weak coupling path rectify and improve, can low-cost, accurate and effective solution electromagnetic compatibility problem.
(3) adopt with disturb the weak Path Determination method of an electromagnetic coupled frequently morely, can seek out main weak path more disturb in the right electromagnetic interference (EMI) coupling network, can solve fast a plurality of interference between electromagnetic interference problem.
(4) by the overlapping highway section in all weak paths being carried out emphasis rectification, can take a spot of measure solve disturb to electromagnetic interference problem, remove the weak link of system's electromagnetic compatibility.
Description of drawings
Fig. 1 process flow diagrams that disturb the weak Path Determination method of electromagnetic coupled more;
Disturb of Fig. 2 is coupled with the synoptic diagram to figure to electromagnetic interference (EMI) more;
Fig. 3 a, 3b, 3c are disturb electromagnetic interference (EMI) coupling digraph abbreviation synoptic diagram more;
Fig. 4 is certain system works schematic diagram among the embodiment;
Fig. 5 is the electromagnetic interference (EMI) coupling digraph of system shown in Figure 4 among the embodiment.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
In in the past electronic equipment troubleshooting and rectification, often the location of realizing equipment failure of the method by the pointwise investigation is taked corresponding electromagnetic compatibility measures to rectify and reform then, thereby is realized the reinforcing of installation electromagnetical compatibility.But traditional method often can not find the weak link of electromagnetic interference (EMI), usually can only take the measure of electromagnetism reinforcing at non-staple coupling path, so not only consuming time, consumption power, consumption wealth, also cause equipment to occur electromagnetic compatibility mal function easily in operational phase, be difficult to safeguard with antijamming capability a little less than problem.Adopt disturb provided by the invention that the weak Path Determination method of electromagnetic coupled is realized that the Electro Magnetic Compatibility of system reinforces more, can locate the main coupling path of electromagnetic interference (EMI) exactly, emc issue that can more high efficiency resolution system.The main path of clear and definite electromagnetic interference (EMI) coupling has great importance to the investigation of the compatible fault of installation electromagnetical and the maintenance of performance.
The loss that the right coupling network of single interference may comprise in the process that the interfering energy of certain frequency is being transmitted has: filter loss L
f, cable loss L
l, A is coupled between cable
l, antenna-cable coupling A
Tl, antenna-hole slot coupling A
Ta, A is coupled between antenna
TrDeng, each waste is represented with dB then the total losses amount of this link on this frequency is:
L=L
f+L
l+A
l+A
tl+A
ta+A
tr
When certain coupling path is the path of all path interfering energy loss minimums in the coupling network, namely be interfering energy being coupled with to the shortest path of path in graphs from the interference source to the sensitive spot, the relevant device on this path is taked the effectively electromagnetic compatibility problem of resolution system of electromagnetic compatibility measure.Right for many interference, the every pair of interference between all have the weak path of an electromagnetic coupled, by every pair of weak path of coupling is rectified and improved, particularly the overlapping highway section on each weak link is rectified and improved, design and the maintenance of electronic system had important directive significance.Disturb to the flow process of the weak Path Determination method of electromagnetic coupled as shown in Figure 1 provided by the invention mainly may further comprise the steps more:
The first step: the fundamental diagram according to system is classified interference and coupling path in the system, obtains intrasystem electromagnetic interference (EMI) coupling network;
In " Electro Magnetic Compatibility Engineering Design Manual " the 56th page, Fig. 3-1-3 has represented the interference and coupling relation of internal system, and intrasystem electromagnetic interference (EMI) circulation way mainly is divided into: antenna-antenna, antenna-cable, casing-casing, line-line, impedance six classes altogether.In the fundamental diagram and circuit theory diagrams of system, sorting technique according to the electromagnetic interference (EMI) propagation, from the fundamental diagram of system, find out possible interference and coupling path, and according to shown in Fig. 3-1-3, a plurality of interference sources of the internal system of drawing are to the interference and coupling network chart of a plurality of sensitive spots.
Second step: obtain in the first step on the basis of coupling network coupling network to be converted into digraph.Concrete step of converting is:
(1) device port in the coupling network is mapped as one by one the summit of digraph.
(2) coupled relation and the energy transmission direction according to coupling network couples together each summit, and in the direction of propagation of digraph acceptance of the bid clear signal.Thereby realized the conversion of system, coupled network chart to digraph.
Many interference and coupling digraph of certain system as shown in Figure 2, wherein the label on each summit represents the port label of each equipment in the electronic system.Three starting points (1,2 and 3) and two terminal points (14 and 15) are arranged in this coupling digraph, and namely being illustrated in has three interference sources (1,2 and 3) and two sensitive spots (14 and 15) in the electronic system.
The 3rd step: calculate the degree on each summit in the digraph according to the knowledge of graph theory, and mark the branch of digraph, realize the simplification of digraph according to the branch of the degree on summit and digraph, specifically simplify step and be:
(1) the summit degree is 0 summit in the deletion digraph, i.e. do not disturb any other equipment in the removal system, also can be by the equipment that other equipment disturbed, and shown in Fig. 3 a, the node A4 that does not link to each other with any node among the deletion figure; Wherein A1 is interference source, and A3 is sensitive spot.
(2) in the deletion digraph with source point and the disconnected subgraph of terminal point, i.e. the equipment that interfering energy is not passed through in the removal system, shown in Fig. 3 b, among the deletion figure by Node B 4, the subgraph that does not participate in the energy transmission that B7, B8 form; B1 wherein, B9 is interference source, B3 is sensitive spot.
(3) summit on source point and terminal point communication path not in the deletion digraph, i.e. in the removal system not at the equipment of interference source to the sensitive equipment path, shown in Fig. 3 c, the node C7 among the deletion figure; C1 wherein, C4 is interference source, C3 is sensitive spot.
The 4th step: utilize the method for emulation and test to obtain between each device port of system at the interfering energy loss value that disturbs the frequency place, and utilize loss value that digraph is carried out assignment.In the electromagnetic interference (EMI) coupling network, establishing port i is L to the loss value of port j under frequency f
Ij, then in the Dui Ying digraph summit i to the limit the numerical value on the limit of j be L just
Ij, and direction is i → j.Loss value L wherein
IjCan adopt the method for emulation or test to obtain; For electromagnetic wave at space coupling (antenna-antenna, antenna-cable, casing-casing, line-line) loss can be adopted electromagnetic field simulation software FEKO to set up corresponding model and calculate isolation between the device port, thereby obtains the loss value between any two ports; Loss on the system works link can be used ADS software to set up corresponding circuit simulation model and draw the loss value of undesired signal on active link for undesired signal.Test then can adopt instruments such as vector network analyzer, test receiver to obtain loss value between the port.
The 5th step: the shortest path based on dijkstra's algorithm (Dykstra algorithm) tracks, seek out in the digraph every pair of interference between shortest path.The shortest path of length so-called shortest path refers to seek in digraph from a summit to the path on another summit.Wherein path is in the assignment digraph, summit to another summit coupling path related limit and.
If D=＜V, A＞be the digraph of band assignment, wherein V represents vertex set, A represents the limit collection, to each bar limit a=＜v of D
i, v
j＞all specify the power of a real number
V wherein
i, v
jI and j summit of expression digraph,＜v
i, v
j＞expression vertex v
iV to the limit
jThe limit,
The numerical value of expression limit a.If
Then order
In the digraph D of band assignment, a given node v who is called initial point
sWith a node v who is called terminal point
j, P (v
j) be from v
sTo v
jPath in the path of length minimum, and claim P (v
j) numerical value be from v
sTo v
jDistance, be expressed as P (v
j)=d (v
s, v
j).T (represents that v) any one node v is to node v
sThe upper bound of distance, λ (v
j) represent from v
sTo v
jShortest path on v
jThe subscript of previous point.S
iExpression proceeds to i during the step, by the set on the summit of label.
Dijkstra is the shortest, and the algorithm solution procedure that tracks is as follows:
(1) beginning (i=0) makes S
0={ v
s, P (v
s)=0, λ (v
s)=0 is to each v ≠ v
s, make T (v)=+ ∞, make k=s; K represents the summit value of last shortest path;
(2) if S
i=V, searching finishes, and algorithm stops, at this moment, to each v ∈ S
i, d (v
s, v)=P is (v); Carry out iterative computation otherwise change (3) over to, v represents any one summit of digraph;
(3) examine or check each and make (v
s, v
j) ∈ A and
Some v
j
If T is (v
j)＞P (v
k)+w
Kj, then T (v
j) be revised as P (v
k)+w
Kj, λ (v
j) be revised as k; Otherwise change (4) over to;
(4) order
Represent i during the step, to v
jBee-line.
If
Then
The T label become the P label
Order
I is changed into i+1, change (2) over to; Otherwise stop, at this moment to each v ∈ S
i, d (v
s, v)=P is (v), and to each
D (v
s, v)=T (v), acquisition shortest path.
When iteration stopped, (v) value just can obtain from v according to the λ of each point
sTo the shortest path of terminal point, wherein P has preserved the numerical value of shortest path.
Use dijkstra's algorithm to determine that each interference source is to the shortest path between each sensitive spot in the digraph successively.
The 6th step: the shortest path that obtains in the 5th step is rectified and improved and reinforcement measure, be specially:
(1) for each sensitive spot, in shortest path, finds all interference sources to the lap of this sensitive spot, and lap is rectified and improved and reinforced;
(2) for each interference source, in shortest path, find this interference source to the lap of all sensitive spots, and lap is rectified and improved and reinforced;
(3) to there not being the shortest path in overlapping highway section, consider that each node on this shortest path is rectified and improved and reinforced.
The 7th step, whether still disturbed, i.e. whether electromagnetic interference (EMI) coupling meets the demands if carrying out judgment device again, if the method that then adopts the present invention to propose that do not meet the demands continues to seek shortest path, repeat～the six step of the 4th step, meet the requirements up to the electromagnetic interference (EMI) coupling.
Embodiment
Certain system has comprised equipment such as fire control, ultrashort wave (USW), shortwave and processor, finds that when carrying out the system integration and test test processor and ultrashort wave (USW) all are subjected to the undesired signal that frequency is 200MHz.The undesired signal of finding 200MHz by analysis derives from fire control and short-wave radio set.
By fundamental diagram shown in Figure 4 the possible interfering link of fire control and short-wave radio set Interaction Handler and ultrashort wave (USW) equipment is analyzed, it is as follows to obtain main interference path:
1) spurious signal of fire control is crosstalked by power lead and is entered utility power, ultrashort wave (USW) is produced disturb;
2) spurious signal of fire control is carried out radiation by cable to the space, disturbs thereby received generation by ultrashort wave antenna;
3) spurious signal of fire control has produced interference by the coupling between cable to processor;
4) spurious signal of fire control is crosstalked by power lead and is entered utility power, processor is produced disturb;
5) spurious signal of fire control is carried out radiation by cable to the space, disturbs thereby processed machine antenna receives generation;
6) harmonic signal of short-wave radio set is crosstalked by power lead and is entered utility power, ultrashort wave (USW) is produced disturb;
7) harmonic signal of short-wave radio set carries out radiation by alignment space, sky, and ultrashort wave (USW) has been produced interference;
8) harmonic signal of short-wave radio set is crosstalked by power lead and is entered utility power, processor is produced disturb;
9) harmonic signal of short-wave radio set has produced interference by the coupling of short-wave antenna and processor cable to processor;
10) harmonic signal of short-wave radio set carries out radiation by alignment space, sky, and processor has been produced interference;
Wherein, Shuo Zi implication is: D1: the connectivity port of fire control and cable A; D2: the connectivity port of fire control and power lead A; D3: the port that power supply A is connected with power lead A; D4: the connectivity port of power supply A and general supply line; D5: the connectivity port of power supply B and general supply line; D6: the connectivity port of power supply B and power lead B; D7: the connectivity port of short-wave radio set and power lead B; D8: the connectivity port of cable B and short-wave radio set; D9: the connectivity port of cable B and antenna A; D10: the connectivity port of cable C and antenna B; D11: cable C and ultrashort connectivity port; D12: the connectivity port of ultrashort wave (USW) and power lead C; D13: the connectivity port of power lead C and power supply C; D14: the connectivity port of power supply C and general supply line; D15: the connectivity port of power supply D and general supply; D16: the connectivity port of power lead D and power supply D; D17: the connectivity port of processor and power lead D; D18: the connectivity port of processor and cable D; D19: the connectivity port of cable D and antenna C; D20: the connectivity port of processor and cable E;
By simulation calculation and actual measurement assignment is carried out on the limit of coupling digraph, obtains digraph such as mistake after the assignment! Do not find Reference source.Shown in: wherein D21 is the fire control interference source, and D22 is the shortwave interference source, and D23 is ultrashort sensitive spot, and D24 is the sensitive spot of processor;
Use four Dijkstra shortest paths algorithm that tracks respectively, the result who tries to achieve is as follows:
Fire control to the shortest coupling path of processor is: D21 → D1 → D20 → D24 (fire control → cable A → cable E → processor).
Fire control to the shortest ultrashort coupling path is: D21 → D1 → D10 → D11 → D23 (fire control → cable A → antenna B → cable C → ultrashort wave (USW)).
Shortwave to the shortest coupling path of processor is: D22 → D8 → D9 → D20 → D24 (shortwave → cable B → antenna A → cable E → processor).
Shortwave to the shortest ultrashort coupling path is: D22 → D8 → D9 → D10 → D11 → D23 (shortwave → cable B → antenna A → antenna B → cable C → ultrashort wave (USW)).
The result shows that four coupling paths the shortest are overlapped.Can obtain from interference source: the cable A that is connected with fire control is main interference leakage point, and the antenna of shortwave is the weak device that undesired signal is leaked; The cable E that can obtain processor from sensitive spot is the predominating path that undesired signal enters, and the coupling between short-wave antenna A and the ultrashort wave antenna B is the main path that interfering energy enters.
Can take corresponding electromagnetic compatibility measure at cable A, cable E, antenna A, antenna B by emphasis according to analysis result, isolation between the shield effectiveness of increase cable A and cable E, the outer occurrence features of the band of suppressing antenna A, increase antenna A and the antenna B, thereby the reinforcing of the system of realization Electro Magnetic Compatibility.
Claims (5)
1. one kind is disturbed the weak Path Determination method of electromagnetic coupled together frequently, it is characterized in that, comprises the following steps:
The first step: under the known situation of interference source and sensitive spot, obtain disturb to coupling network;
Second step: the coupling network that the first step is obtained converts digraph to;
The 3rd step: according to the branch of degree and the digraph on digraph summit, digraph is simplified;
The 4th step: assignment is carried out on the limit to digraph;
The 5th step: determine that every pair of interference source is to the shortest path between sensitive spot in the digraph;
The 6th step: the shortest path that obtains in the 5th step is rectified and improved and reinforcement measure, be specially:
(1) for each sensitive spot, finds all interference sources to the lap of this sensitive spot at shortest path, and lap is rectified and improved and reinforced;
(2) for each interference source, in shortest path, find this interference source to the lap of all sensitive spots, and lap is rectified and improved and reinforced;
(3) to there not being the shortest path in overlapping highway section, consider that each node on this shortest path is rectified and improved and reinforced;
The 7th step repeated～the six step of the 4th step, met the requirements up to the electromagnetic interference (EMI) coupling.
2. according to claim 1 a kind of with disturbing frequently the weak Path Determination method of electromagnetic coupled, it is characterized in that: the conversion described in second step is specially more:
(1) device port in the coupling network is mapped as one by one the summit of digraph;
(2) coupled relation and the energy transmission direction according to coupling network couples together each summit, and in the direction of propagation of digraph acceptance of the bid clear signal.
3. according to claim 1 a kind of with disturbing frequently the weak Path Determination method of electromagnetic coupled, it is characterized in that: the abbreviation described in the 3rd step is specially more:
(1) the summit degree is 0 summit in the deletion digraph;
(2) deletion digraph in source point and the disconnected subgraph of terminal point;
(3) summit on source point and terminal point communication path not in the deletion digraph.
4. according to claim 1 a kind of with disturbing frequently the weak Path Determination method of electromagnetic coupled more, it is characterized in that: described assignment, be specially: utilize the method for emulation and test to obtain between each device port of system in the interfering energy loss value of disturbing the frequency place, and utilize the loss value that digraph is carried out assignment.
5. according to claim 1 a kind of with disturbing frequently the weak Path Determination method of electromagnetic coupled, it is characterized in that: the shortest path described in the 5th step adopts dijkstra's algorithm more.
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| CN110275078B (en) * | 2019-07-16 | 2021-10-15 | 国网江苏省电力有限公司电力科学研究院 | Method and system for distinguishing secondary cable ground loop disturbance of transformer substation and storage medium |
| CN113111526A (en) * | 2021-04-21 | 2021-07-13 | 北京航空航天大学 | Antenna isolation degree prediction method based on near-field test data of receiving and transmitting antenna, storage medium and device |
| CN113111526B (en) * | 2021-04-21 | 2021-09-21 | 北京航空航天大学 | Antenna isolation degree prediction method based on near field data, storage medium and device |
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