CN101697177A - Method for modeling field-path cooperative model for predicting field line coupled system response - Google Patents

Method for modeling field-path cooperative model for predicting field line coupled system response Download PDF

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CN101697177A
CN101697177A CN200910236514A CN200910236514A CN101697177A CN 101697177 A CN101697177 A CN 101697177A CN 200910236514 A CN200910236514 A CN 200910236514A CN 200910236514 A CN200910236514 A CN 200910236514A CN 101697177 A CN101697177 A CN 101697177A
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陈文青
汪玉梅
吴龙刚
苏东林
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Beihang University
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Abstract

The invention discloses a method for modeling a field-path cooperative model for predicting a field line coupled system response, which comprises the step of: using the combination of an ADS platform and an HFSS platform with a modified Taylor model under a single interference source radiation to create a complete model which couples electromagnetic wave radiated from jamming equipment to interfered equipment through a cable so as to obtain the responses of two pieces of terminal interfered equipment connected by the cable at the jamming equipment. In a state of a definite equivalent radiation source, the method for modeling a field-path cooperative model disclosed by the invention can be used for predicting a coupled response condition on the cable excited by the electromagnetic wave generated by any jamming equipment so as to provide information reference for device-level and system-level electromagnetic compatibility designs.

Description

A kind of field-Lu cooperation model method for building up of predicting the field wire coupled system response
Technical field
The present invention relates to a kind of field-Lu cooperation model method for building up, more particularly say, be meant the field road cooperation model method for building up of the coupling response that a kind of excitation of electromagnetic wave transmission cable terminal device of jamming equipment radiation produces, belong to prediction of electromagnetic compatibility technology interference and coupling and design field.
Background technology
In electric or electronic equipment, cable (cable or wire) is to be used for ways of connecting between realization equipment and equipment, the equipments and devices.When the common collaborative work of a plurality of equipment, the equipment that has can produce electromagnetic interference (EMI), and this electromagnetic interference (EMI) can be coupled on another equipment by cable, causes the performance of another equipment to descend, even can't operate as normal.Along with the widespread use of digital device and integrated circuit, electronic equipment is responsive especially to external electromagnetic field, and external electromagnetic field gets more and more people's extensive concerning by the electromagnetic interference (EMI) of the electromagnetic coupled effect generation of cable always.
For the analysis of field-line coupled system, the method for employing mainly contains directly based on the Finite Difference-Time Domain branch of Maxwell equation with based on transmission line model two classes at present.The former directly finds the solution the cable boundary value problem from the Maxwell equation.These class methods are strict in theory, but it is in actual applications to computing time and request memory strictness.The latter is based on the Maxwell equation and analyzes the equation for transmission line that cable is set up one group of equivalence, has model simple, and the advantage that calculated amount is little is widely used in the analysis of field wire coupled system.The comparative maturity transmission line model has three kinds: Taylor model, Agrawal model and Rachidi model.The common defects of these three kinds of models is owing to model is to be described by incident wave component, need priori knowledge be arranged to incident wave information, so existing research mostly is to known qualitative analyses of electromagnetic wave form such as super-broadband electromagnetic impulse, fast forward position electromagnetic pulse or nuclear electromagnetic pulses, can not set up the complete model from interference source to disturbed equipment.
The Taylor model is disclosed in the IEEE TRANSACTIONS ONANTENNAS AND PROPAGATION in August 26 nineteen sixty-five, and article name is " The Response of a TerminatedTwo-Wire Transmission Line Excited by a Nonuniform ElectromagneticField ".
ADS (Andvanced Design System) is the electronic design automation software of U.S.'s Agilent (Agilent) company.This software function is very powerful, comprise time domain circuit simulation, frequency domain circuit simulation, 3 D electromagnetic emulation, Communication System Simulation and digital signal processing design of Simulation, support radio frequency and system design engineer to develop all types of RF designs, from simple to complexity, to being used to communicate by letter and the integrated MMIC of space flight/national defence, is current domestic each university and maximum microwave/radio circuit and the Communication System Simulation software of research institute's use from discrete RF module.
Radio system analytical approach among the ADS provides the user to simulate the evaluating system characteristic, and wherein the circuit model of system also can use the element circuitry model to carry out response verification except that can usage behavior level model.The radio system simulation analysis has comprised above-mentioned linear analysis, harmonic balance analysis and circuit Envelope Analysis, be used for verifying the passive element of radio system and linearized system model characteristics, nonlinear system model characteristic respectively, have the system performance of digital frequency-modulation signal.
HFSS (High Frequency Structure Simulator) is based on the 3 D electromagnetic simulation software of the analysis microwave engineering problem of electromagnetic finite element method.This software can be realized antenna, array antenna and feed design, radio frequency and microwave device design, high frequency IC design, High Speed PCB Board and the design of RF pcb board etc.Microwave designing person can correctly discern, handle galvanomagnetic effect by HFSS, and this also is the reason why HFSS becomes the golden standard of microwave/RF designs.For any three-D high frequency microwave device, as waveguide, wave filter, coupling mechanism, connector, ferrite device resonant cavity etc., HFSS can both provide instrument to realize S parameter extraction, production debugging and optimization, finally reaches the manufacturing requirement.
The microwave antenna deviser can use HFSS and design, optimizes and predict antenna performance.To complicated radar shielding harness and any feeding network, HFSS its electromagnetic performance that can both calculate to a nicety comprises radiation direction figure, lobe width, internal electromagnetic field distribution or the like from simple monopole antenna.
Summary of the invention
For effectively predicted interference equipment is via the performance impact of electromagnetic wave to Cable Termination Equipment, the present invention proposes a kind of field road cooperation model method for building up of predicting the field wire coupling response.This road cooperation model method for building up is the correction Taylor model that utilizes under ADS platform, HFSS platform and the single interference source radiation
Figure G2009102365146D0000021
Combination, set up from the electromagnetic wave of jamming equipment radiation and be coupled to the complete model of disturbed equipment, thereby obtain the response of two disturbed equipment of terminal cable being connected at this jamming equipment via cable.Clear and definite under the state of equivalent radiation source, road disclosed by the invention cooperation model method for building up can be used to predict the coupling response situation on the cable under the excitation of electromagnetic wave that any jamming equipment produces, thereby provides information reference for device level and system-level EMC Design.
A kind of field-Lu cooperation model method for building up of predicting the field wire coupled system response of the present invention is based on the field-Lu cooperation model method for building up of numerical simulation platform.Two the disturbed equipment of terminal that connect for the cable that quantizes under the electromagnetic field excitation of jamming equipment radiation are subjected to the electromagnetic wave effect, include the following step:
The first step: obtain jamming equipment system-level model C i(In i, T i)
Jamming equipment behavioral scaling model C i(In i, T i), include the number i of jamming equipment, input signal In i, transport function T i
Second step: obtain jamming equipment equivalence radiation source S i(G i, L i)
Jamming equipment equivalence radiation source includes the excitation G of the number i of equivalent radiation source, equivalent radiation source i(g i, φ i) and the size L of equivalent radiation source i, then any one equivalent radiation source expression-form is S i(G i, L i); The excitation G of described equivalent radiation source i(g i, φ i) be first step jamming equipment system-level model C i(In i, T i) output signal, and G i(g i, φ i)=In i* T iThe size L of described radiation source iInclude the long LA of radiation source i, wide LB i, high LC iPerhaps radius LR i, if radiation source is when being cylindrical shape, the size L of equivalent radiation source then iChoose long LA iWith radius LR iIf radiation source is when being rectangular shape, the size L of radiation source then iChoose long LA i, wide LB i, high LC i
The 3rd step: obtain the total field information E of jamming equipment equivalence radiate source radiation i(e i, θ i)
With equivalent radiation source S i(G i, L i), the excitation G of equivalent radiation source i(g i, φ i) and cable border KL (l, a, D, σ, ε μ) introduces in the Numerical Calculation of Electromagnetic Field platform, resolves and obtains the current total field information E of electromagnetic wave i(e i, θ i);
At given G i(g i, φ i) under, jamming equipment equivalence radiation source is that the field distribution of cylindrical monopole antenna is:
In the near field region when (r≤λ/2 π), the field distribution of equivalent radiation source
Figure G2009102365146D0000031
And I = j π G i ( g i , φ i ) 25 ln ( L A i L R i ) ;
In the far-field region when (r＞λ/2 π), the field distribution of equivalent radiation source And I = j π G i ( g i , φ i ) 25 ln ( L A i L R i ) ;
With cable border KL (l, a, D, σ, ε is μ) as the Maxwell equation Boundary condition, find the solution and obtain the total field information E of electromagnetic wave i(e i, θ i);
The 4th step: obtain cable terminations voltage V i(l)
According to revising the Taylor model To the total field information E of electromagnetic wave i(e i, θ i) carry out integral operation, thus cable terminations voltage obtained
Figure G2009102365146D0000042
A kind of field-Lu cooperation model method for building up of predicting the field wire coupled system response of the present invention in complex electromagnetic environment, has a plurality of jamming equipments, and this just need carry out modeling to different radiation sources; When a plurality of jamming equipments are carried out coupling response of cable, repeat the first step to the process in four steps, and note equivalent radiation source model, the jamming equipment excitation of each jamming equipment and the cable terminations voltage under the cable border, utilize superposition principle to obtain cable terminations voltage under a plurality of equipment common interference then.
The field of prediction field wire coupled system response of the present invention-Lu cooperation model method for building up advantage is:
1. from " field " model of behavioral scaling " road " model of jamming equipment equivalence radiation source, set up the complete model of field wire coupled system, found the approach of a kind of field wire coupling analysis from qualitative to quantitative.
2. the field wire coupling analysis does not need to consider complex conditions based on " road " and transmission line theory, and ambient condition information is considered in total field information, has simplified the analysis of field-line coupled system, is applicable to big system complex electromagnetic environment.
3. because correction Taylor model is based on total field component, need not to quantize the response that each independent incident electromagnetic wave is coupled to cable, simplified the difficulty that coupling response detects.
4. in revising the Taylor model, total field component can obtain by numerical simulation platform (HFSS), in conjunction with different aftertreatment platforms, can obtain multi-form resultant field component information, obtain coupling response on the corresponding cable flexibly, for example obtain required resultant field component amplitude maximal value, can analyses and prediction " worst case " end-line coupling response.
5. the correction Taylor model among the present invention is based on resultant field information, and this model fully takes into account the influence of cable surrounding environment to coupling response, is fit to electromagnetic field and is coupled to situation on the cable by labyrinths such as hole slot coupling.
6. the field information that actual test obtains also is the resultant field component information, combines with this correction Taylor model to realize field-line coupling prediction, the engineering significance with reality.
Description of drawings
Fig. 1 is the physical model structure figure of field-line coupled system.
Figure 1A is the equivalent circuit diagram of field-line coupled system.
Fig. 2 is the floor map at HFSS platform of the present invention midfield-line coupled system.
Fig. 2 A is the amplification assumption diagram of equivalent source monopole antenna.
Fig. 2 B is that the equivalence of A jamming equipment is the amplification assumption diagram of a rectangular monopole antenna.
Fig. 3 is the surface chart of Numerical Calculation of Electromagnetic Field platform among the present invention.
Fig. 4 is the coupling response of cable detecting operation process flow diagram of the present invention under excitation of electromagnetic wave.
Fig. 5 is the physical model structure figure that has the field-line coupled system of two jamming equipments.
Fig. 5 A is the behavioral scaling model of A jamming equipment among the embodiment 1.
Fig. 5 B is the behavioral scaling model of B jamming equipment among the embodiment 1.
Fig. 6 A is the cylindrical monopole antenna resultant field amplitude versus frequency characte figure of A jamming equipment equivalence among the embodiment 1.
Fig. 6 B is the cylindrical monopole antenna resultant field amplitude versus frequency characte figure of B jamming equipment equivalence among the embodiment 1.
Fig. 7 is the cable terminations response that obtains among the embodiment 1.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Referring to shown in Figure 1, to realize being connected by cable between the disturbed equipment of A and the disturbed equipment of B among the figure, this cable can be realized mutual transmission information between disturbed equipment of A and the disturbed equipment of B.In working order down, the electromagnetic wave that jamming equipment produces can be coupled on the disturbed equipment by cable, and the work quality of disturbed equipment is exerted an influence.The disturbed equipment of A, the disturbed equipment of B, cable and electromagnetic wave just form a field-line coupled system physical model.The length of on the scene-line coupled system physical model cable is designated as l, and (unit: m), the radius of cable is designated as a, and (unit: m), the distance on cable and ground is designated as D (unit: m).
Shown in Figure 1A, this Figure 1A is the equivalent electrical circuit of field-line coupled system physical model shown in Figure 1.The disturbed equipment equivalence of A is first impedance Z among the figure 1, the disturbed equipment equivalence of B is second impedance Z 2With the direction perpendicular to ground is that the Z axle is set up a right-handed coordinate system, and wherein true origin O is first impedance Z 1The projected centre point of projection on the ground, the positive dirction of X-axis are that direction is stretched on vertical edge of cable, point to first impedance Z by ground 1Direction be the positive dirction of Z axle.
In order to quantize first impedance Z in the equivalent electrical circuit shown in Figure 1A 1With second impedance Z 2Be subjected to the electromagnetic wave effect (promptly to be connected two cables between jamming equipment, the cable of this cable under equivalent radiation source model, jamming equipment excitation and the cable boundary condition of jamming equipment is subjected to the electromagnetic wave effect, this influence degree has adopted magnitude of voltage to express), the present invention propose a kind of under the Electromagnetic Interference that the equipment that is interfered produces the field road collaborative detection method of cable terminal response.
Referring to shown in Figure 4, a kind of field-Lu cooperation model method for building up of predicting the field wire coupled system response, this method step is:
The first step: obtain jamming equipment system-level model C i(In i, T i)
Behavioral scaling model is based on circuit block or subsystem top-level feature, circuit block or subsystem is regarded as black box extract, and does not need to extract internal feature, only carries out the interference and the anti-interference simulation analysis of modeling level according to the external echo feature.Behavioral scaling model is set up the characteristic information that does not need the acquisition cuicuit bottom, only need embody the function treatment to input signal to get final product.Behavioral scaling model is not limited to circuit bottom and internal feature, is suitable for the interference and the anti-interference simulation analysis of system.Set up the jamming equipment behavioral scaling model by means of system-level emulation platform (ADS platform), can obtain the output signal information of jamming equipment.
Jamming equipment behavioral scaling road MODEL C i(In i, T i), include the number i of jamming equipment, input signal In i, system function T i
Second step: obtain equivalent radiation source S i(G i, L i)
The process of jamming equipment radiation field can be come equivalence by setting up an equivalent radiation source model, and equivalent radiation source is described by radiation source form and excitation.By setting up equivalent radiation source model, corresponding driving source and radiation border are set, by means of electromagnetic field numerical simulation platform (HFSS platform), can obtain the information of jamming equipment radiation field.
The equivalence radiation source includes the excitation G of the number i of equivalent radiation source, equivalent radiation source i(g i, φ i) and the size L of equivalent radiation source i, then any one equivalent radiation source expression-form is S i(G i, L i).The size L of described radiation source iInclude the long LA of radiation source i, wide LB i, high LC iPerhaps radius LR i, if radiation source is when being cylindrical shape, the size L of equivalent radiation source then iChoose long LA iWith radius LR iIf radiation source is when being rectangular shape, the size L of radiation source then iChoose long LA i, wide LB i, high LC i
Shown in Fig. 2, Fig. 2 A, in the present invention, be a cylindrical monopole antenna with a jamming equipment equivalence among Fig. 1, the radiation information of this cylindrical monopole antenna is designated as S 1(G 1, LA 1, LR 1).If two jamming equipments are arranged under the environment of cable place, then have two radiation sources, radiation information is designated as first radiation information respectively and is designated as S at this moment 1(G 1, LA 1, LR 1), second radiation information is designated as S 2(G 2, LA 2, LR 2).
The present invention is that cylindrical monopole antenna is owing to the jamming equipment radiated electromagnetic wave mainly is that common mode radiation causes with the jamming equipment equivalence.And the structure of monopole antenna can simulate the process of common mode radiation well.
The 3rd step: obtain the total field information E of equivalent radiate source radiation i(e i, θ i)
Referring to shown in Figure 3, with equivalent radiation source S i(G i, L i), the excitation G of equivalent radiation source i(g i, φ i) and cable border KL (l, a, D, σ, ε μ) introduces in the Numerical Calculation of Electromagnetic Field platform, resolves and obtains the current total field information E of electromagnetic wave i(e i, θ i).
At given G i(g i, φ i) under, jamming equipment equivalence radiation source is that the field distribution of cylindrical monopole antenna is:
In the near field region when (r≤λ/2 π), the field distribution of equivalent radiation source
Figure G2009102365146D0000071
And I = j π G i ( g i , φ i ) 25 ln ( L A i L R i ) ;
In the far-field region when (r＞λ/2 π), the field distribution of equivalent radiation source
Figure G2009102365146D0000073
And I = j π G i ( g i , φ i ) 25 ln ( L A i L R i ) .
With cable border KL (l, a, D, σ, ε is μ) as the Maxwell equation
Figure G2009102365146D0000075
Boundary condition, find the solution and obtain the total field information E of electromagnetic wave i(e i, θ i).
The 4th step: obtain cable terminations voltage V i(l)
According to revising the Taylor model
Figure G2009102365146D0000076
To the total field information E of electromagnetic wave i(e i, θ i) carry out integral operation, thus cable terminations voltage obtained
Figure G2009102365146D0000077
In complex electromagnetic environment, have a plurality of jamming equipments, this just need carry out modeling to different radiation sources.When a plurality of jamming equipments are carried out coupling response of cable, repeat the first step to the process in four steps, and note the excitation of the equivalent radiation source model of each jamming equipment, equivalent radiation source and the cable terminations voltage under the cable border, utilize superposition principle to obtain cable terminations voltage under a plurality of equipment common interference then.
In the present invention, transmission line model is when analyzing the field wire coupled problem, based on Maxwell equation, and by rationally approximate, one group of the telegraph equation that obtains about the current/voltage on the cable.Also can equivalence encourage transmission line for voltage source and the current source that distributes, wherein voltage source of Fen Buing and current source are by the incident field component statement.
Embodiment 1:
Referring to shown in Figure 5, cable is connected between disturbed equipment of A and the disturbed equipment of B, and cable carries out coupling response of cable and detects and to be under the electromagnetic interference (EMI) that is subjected to A jamming equipment and B jamming equipment:
Cable parameter: l=1m, d=0.01m, a=0.0015m, Z 1=Z 2=300 Ω.
The behavioral scaling model of A jamming equipment is shown in Fig. 5 A, and input signal is In 1=0.07cos (2 π ft), transport function
Figure G2009102365146D0000081
T wherein NBe N rank Chebyshev polynomials.Emulation obtains the pumping signal G that output signal is the radiation source of A jamming equipment equivalence through ADS platform harmonic balance 1(g 1, φ 1).
With the equivalence of A jamming equipment is first cylindrical monopole antenna (shown in Fig. 2 A), its length L A 1=1.077 * 10 -4M, radius LR 1=5 * 10 -6M, driving source voltage amplitude v 1=3V, phase 1=25 °, simulation frequency f=696.5MHZ.
The behavioral scaling model of B jamming equipment is shown in Fig. 5 B, and input signal is In 1=0.07cos (2 π ft), transport function
Figure G2009102365146D0000082
T wherein NBe N rank Chebyshev polynomials.Emulation obtains the pumping signal G that output signal is the radiation source of B jamming equipment equivalence through ADS platform harmonic balance 2(g 2, φ 2).
With the equivalence of B jamming equipment is second cylindrical monopole antenna (shown in Fig. 2 A), its length L A 2=8.965 * 10 -5M, radius LR 2=5 * 10 -6M, driving source voltage amplitude v 2=3.4V, phase 2=-1.6 °, simulation frequency f=836.5MHZ.
Cable border: conductivity σ=5.7 * 10 7(S/m of unit), DIELECTRIC CONSTANT=8.85 * 10 -12(F/m of unit), magnetic permeability μ=4 π * 10 -7(H/m of unit).
Above-mentioned parameter is carried out typing by interface shown in Figure 3, resolve the total field information of electromagnetic wave under the electromagnetic interference (EMI) that obtains A jamming equipment and the generation of B jamming equipment by the Numerical Calculation of Electromagnetic Field platform, shown in Fig. 6 A, Fig. 6 B.In Fig. 6 A, solid line represents that the A jamming equipment distributes at the electric field phase of cable terminations along the Z axle.Dotted line represents that the A jamming equipment distributes in the electric field amplitude of cable terminations along the Z axle.In Fig. 6 B, solid line represents that the B jamming equipment distributes at the electric field phase of cable terminations along the Z axle.Dotted line represents that the B jamming equipment distributes in the electric field amplitude of cable terminations along the Z axle.Fig. 6 A and Fig. 6 B are contrasted as can be known, and under the amplitude and phase condition of difference excitation, the response that connects the cable of disturbed equipment is different.
The corresponding data of each parameter of cable and Fig. 6 A, Fig. 6 B is brought into correction Taylor model
Figure G2009102365146D0000083
In to find the solution the voltage responsive that obtains two radiation sources be V 1(l) and V 2(l), V 1(l) voltage responsive, the V of expression A jamming equipment 2(l) voltage responsive of expression B jamming equipment.Use superposition principle then and obtain the terminal voltage response of cable under the common excitation of two radiation sources, as shown in Figure 7.
Embodiment 2:
Referring to shown in Figure 5, cable is connected between disturbed equipment of A and the disturbed equipment of B, and cable carries out coupling response of cable and detects and to be under the electromagnetic interference (EMI) that is subjected to A jamming equipment and B jamming equipment:
Cable parameter: l=1m, d=0.01m, a=0.0015m, Z 1=Z 2=300 Ω.
The behavioral scaling model of A jamming equipment and B jamming equipment is respectively with embodiment 1.
With the equivalence of A jamming equipment is first rectangular monopole antenna (shown in Fig. 2 B), its length L A 1=5 * 10 -6M, wide LB 1=5 * 10 -6M, high LC i=1.077 * 10 -4M, driving source voltage amplitude v 1=3V, phase 1=25 °, simulation frequency f=696.5MHZ.
With the equivalence of B jamming equipment is second square cylindricality monopole antenna (shown in Fig. 2 B), its length L A 2=5 * 10 -6M, wide LB i=5 * 10 -6M, high LC i=8.965 * 10 -5M, driving source voltage amplitude v 2=3.4V, phase 2=-1.6 °, simulation frequency f=836.5MHZ.
Cable border: conductivity σ=5.7 * 10 7(S/m of unit), DIELECTRIC CONSTANT=8.85 * 10 -12(F/m of unit), magnetic permeability μ=4 π * 10 -7(H/m of unit).
Above-mentioned parameter is carried out typing by interface shown in Figure 3, resolve the total field information of electromagnetic wave under the electromagnetic interference (EMI) that obtains A jamming equipment and the generation of B jamming equipment by the Numerical Calculation of Electromagnetic Field platform.
The total field information corresponding data of electromagnetic wave is brought into correction Taylor model
Figure G2009102365146D0000091
In find the solution the voltage responsive that obtains disturbed equipment of A and the disturbed equipment of B respectively, use superposition principle then and obtain the terminal voltage response of cable under the common excitation of A jamming equipment and B jamming equipment.
A kind of method for detecting coupling response of cable that is applicable under the excitation of electromagnetic wave of the present invention is by with equivalent radiation source S i(G i, L i), the excitation G of equivalent radiation source i(g i, φ i) and cable border KL (l, a, D, σ, ε μ) introduces in the Numerical Calculation of Electromagnetic Field platform (HFSS), resolves and obtains the current total field information E of electromagnetic wave i(e i, θ i), then with the total field information E of equivalent radiate source radiation i(e i, θ i) substitution correction Taylor model To the total field information E of electromagnetic wave i(e i, θ i) carry out integral operation, thus cable terminations voltage obtained
Figure G2009102365146D0000093
The correction Taylor model that the present invention uses
Figure G2009102365146D0000101
Adopt total field component to be described, need not each jamming equipment is carried out separate analysis, therefore be suitable for complex electromagnetic environments in the big system.
Following table is the physical significance of letter in the formula involved in the present invention:
Figure G2009102365146D0000102
Figure G2009102365146D0000111

Claims (6)

1. field-Lu cooperation model method for building up of predicting the field wire coupled system response is characterized in that: the field-Lu cooperation model method for building up that is based on the numerical simulation platform; Two the disturbed equipment of terminal that connect for the cable that quantizes under the electromagnetic field excitation of jamming equipment radiation are subjected to the electromagnetic wave effect, include the following step:
The first step: obtain jamming equipment system-level model C i(In i, T i)
Jamming equipment behavioral scaling model C i(In i, T i), include the number i of jamming equipment, input signal In i, transport function T i
Second step: obtain jamming equipment equivalence radiation source S i(G i, L i)
Jamming equipment equivalence radiation source includes the excitation G of the number i of equivalent radiation source, equivalent radiation source i(g i, φ i) and the size L of equivalent radiation source i, then any one equivalent radiation source expression-form is S i(G i, L i);
The excitation G of described equivalent radiation source i(g i, φ i) be first step jamming equipment system-level model C i(In i, T i) output signal, and G i(g i, φ i)=In i* T i
The size L of described radiation source iInclude the long LA of radiation source i, wide LB i, high LC iPerhaps radius LR i
The 3rd step: obtain the total field information E of jamming equipment equivalence radiate source radiation i(e i, θ i)
With equivalent radiation source S i(G i, L i), the excitation G of equivalent radiation source i(g i, φ i) and cable border KL (l, a, D, σ, ε μ) introduces in the Numerical Calculation of Electromagnetic Field platform, resolves and obtains the current total field information E of electromagnetic wave i(e i, θ i);
At given G i(g i, φ i) under, jamming equipment equivalence radiation source is that the field distribution of cylindrical monopole antenna is:
In the near field region when (r≤λ/2 π), the field distribution of equivalent radiation source H = I × LA i 2 π r 2 E = 30 × I × LA i × λ π r 3 , And I = j π G i ( g i , φ i ) 25 ln ( LA i LR i ) ;
In the far-field region when (r＞λ/2 π), the field distribution of equivalent radiation source H = I × LA i λr E = 120 π × I × LA i λ r , And I = j π G i ( g i , φ i ) 25 ln ( LA i LR i ) ;
With cable border KL (l, a, D, σ, ε is μ) as the Maxwell equation
Figure F2009102365146C0000021
Boundary condition, find the solution and obtain the total field information E of electromagnetic wave i(e i, θ i);
The 4th step: obtain cable terminations voltage V i(l)
According to revising the Taylor model To the total field information E of electromagnetic wave i(e i, θ i) carry out integral operation, thus cable terminations voltage obtained
Figure F2009102365146C0000023
2. a kind of field-Lu cooperation model method for building up of predicting the field wire coupled system response according to claim 1 is characterized in that: when described radiation source is cylindrical shape, and the size L of equivalent radiation source then iChoose long LA iWith radius LR i
3. a kind of field-Lu cooperation model method for building up of predicting the field wire coupled system response according to claim 1 is characterized in that: when described radiation source is rectangular shape, and the size L of radiation source then iChoose long LA i, wide LB i, high LC i
4. a kind of field-Lu cooperation model method for building up of predicting the field wire coupled system response according to claim 1, it is characterized in that: in complex electromagnetic environment, have a plurality of jamming equipments, this just need carry out modeling to different radiation sources; When a plurality of jamming equipments are carried out coupling response of cable, repeat the first step to the process in four steps, and note equivalent radiation source model, the jamming equipment excitation of each jamming equipment and the cable terminations voltage under the cable border, utilize superposition principle to obtain cable terminations voltage under a plurality of equipment common interference then.
5. a kind of field-Lu cooperation model method for building up of predicting the field wire coupled system response according to claim 1, it is characterized in that: transmission line model is when analyzing the field wire coupled problem, based on Maxwell equation, by rationally approximate, one group of the telegraph equation that obtains about the current/voltage on the cable.
6. a kind of field-Lu cooperation model method for building up of predicting the field wire coupled system response according to claim 1, it is characterized in that: transmission line model is when analyzing the field wire coupled problem, based on Maxwell equation, by rationally approximate, obtain voltage source and the current source excitation transmission line of equivalence for distributing, wherein voltage source of Fen Buing and current source are by the incident field component statement.
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