CN102981064B - Aircraft external radio frequency electromagnetic environment prediction method and prediction system - Google Patents
Aircraft external radio frequency electromagnetic environment prediction method and prediction system Download PDFInfo
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Abstract
The invention relates to the technical field of electromagnetic environment prediction, and discloses an aircraft external radio frequency electromagnetic environment prediction method and a prediction system. The system comprises an electromagnetic environmental parameter acquisition device, a data center, a simulating calculation center and a visual output terminal device. The method is that collected electromagnetic environmental parameter information of radiation sources, atmospheric environment, ground environment and sea environment is transmitted to the data center which is connected through networks by means of the electromagnetic environmental parameter acquisition device, and is stored in a data base which corresponds to the data center. The data center is connected with the simulating calculation center through a data line, and the simulating calculation center enables comprehensively predicted data model information of aircraft external radio frequency electromagnetic environment to be transmitted to the visual output terminal device which is connected through a video bus, so that the electromagnetic environment can be displayed comprehensively. According to the aircraft external radio frequency electromagnetic environment prediction method and the prediction system, an improved signal description word method is adopted to conduct modeling of aircraft external electromagnetic signal environment, and therefore the signal processing operational amount is reduced and the prediction efficiency is enhanced.
Description
Technical field
The present invention relates to EME forecast technical field, particularly relate to a kind of aircraft exterior radio-frequency electromagnetic environmental forecasting method and prognoses system.
Background technology
Electromagnetic environment refers to the summation of all electromagnet phenomenons being present in given place or space.Complex electromagnetic environment refers in limited space-time, in certain frequency range, multiple electromagnetic signal is intensive, overlapping, infosystem and electronic equipment is hindered normally to work, on the electromagnetic environment that infosystem and electronic equipment make a significant impact, it is the complicated form of expression on spatial domain, time domain, frequency domain and energy domain of electromagnetic environment.
From existing research conditions, current EME forecast means can't meet the requirement of complicated electromagnetic environment change, are mainly manifested in: be difficult to scientific definition actual combat environment true to nature, typical; Be difficult to comprehensive, that objective description affects electronic information electromagnetic environment key element; Be difficult to Obtaining Accurate electronic information information; Be difficult to accurate description electromagnetic signal propagation factor to the impact of electronic information; Be difficult to the variation characteristic of accurate simulation various types of signal.EME forecast technology becomes to be evaluated electronic information Electro Magnetic Compatibility and avoids electromagnetic compatibility problem key issue urgently to be resolved hurrily.
At present, electromagnetic environment emulation prediction is mainly based on Numerical Calculation of Electromagnetic Fields method, and the method is the modeling method based on Maxwell equation.The method is larger due to operand, is generally used for low frequency electromagnetic environmental modeling, the transient electromagnetic field state of certain point aerial when being characterized in reflecting, but application scale is less, and frequency range is lower, is not suitable for the prediction of large-scale electromagnetic environment emulation.
The formation of aircraft exterior electromagnetic environment not only comprises the radiation of the various radiation source in space, also comprises the electromagnetic radiation of interplane and other aircrafts inner.Due to features such as space are vast, radiation source is of a great variety, different spaces range of radiation source electromagnetic environmental impact degree difference is large, existing EME forecast system can not meet the forecast demand of aircraft exterior radio-frequency electromagnetic environment.
Summary of the invention
In order to can full forecast aircraft exterior radio-frequency electromagnetic environment, the invention provides a kind of aircraft exterior radio-frequency electromagnetic environmental forecasting method and prognoses system, by radar receiver, communication station, environmental monitoring system, measure radar and radar jamming system in aircarrier aircraft flight range, communicate and the radiation source data such as communication jamming system, and comprise the environmental data of atmospheric environment, ground environment, sea environment, and by these data by Internet Transmission to prognoses system, as EME forecast system data basis.And the present invention may be used for the external radio frequency electromagnetic environment predicting the systems such as all kinds of aircraft, steamer, ground surface platform or platform.
For achieving the above object, the present invention adopts following technical scheme:
A kind of aircraft exterior radio-frequency electromagnetic environmental forecasting system, comprise: gather electromagnetic environment parameter device, data center, simulation calculation center and visual outlet terminal device, described collection electromagnetic environment parameter device by gather radiation source, atmospheric environment, ground environment, sea environment electromagnetic environment parameter information transmission to the data center be connected by network, and be stored in the corresponding database of data center; Described data center is connected with simulation calculation center by data line, the data model information of aircraft exterior radio-frequency electromagnetic environment full forecast is transferred to the visual outlet terminal equipment be connected by video bus by described simulation calculation center, carries out electromagnetic environment synthesis display.
A kind of aircraft exterior radio-frequency electromagnetic environmental forecasting system, described data center is made up of data processing unit and disk array, for all kinds of parameters receiving, process and stored parameter measuring system records; Described data processing unit is connected with the database of data center's disk array; Described data processing unit comprises: data receiver, data screening, Data classification and data processing function module, and the database on described disk array comprises: radiation source database and environment data base.
A kind of aircraft exterior radio-frequency electromagnetic environmental forecasting system, described simulation calculation center is made up of aircraft exterior electromagnetic environment emulation unit and interplane electromagnetic-field simulation unit; Described aircraft exterior electromagnetic environment emulation unit is connected with data center by data line; Described interplane electromagnetic-field simulation unit carries out stress and strain model to the space of interplane, calculates electromagnetic field data in each grid, processes result of calculation; The electromagnetic environment emulation information of described aircraft exterior and interplane, is connected with visual outlet terminal equipment by control module.
A kind of aircraft exterior radio-frequency electromagnetic environmental forecasting system, described visual outlet terminal equipment is for showing aircraft exterior radio-frequency electromagnetic environmental simulation information, comprise display: the two-dimensional electromagnetic situation of aircraft exterior, electromagnetic environment statistical information, and the 3-D display information of interplane electromagnetic field.
A kind of aircraft exterior radio-frequency electromagnetic environmental forecasting method, its step is as follows:
Step one: set up electromagnetic environment parameter data center, by set up radiation source, atmospheric environment, ground environment, sea environment gather electromagnetic environment parameter, set up electromagnetic environment parameter database, and be stored on the large storage facilities of disk array; By LAN or internet by gathered parameters information transmission to data center, store in typing central database after data processing.
Step 2: set up spacing wave environmental model base
(1) set up signal description model, the signal description word modeling method of application enhancements, set up radar signal environment model/Radar jam signal environmental model, signal of communication environmental model/communication interference signals environmental model.
1), radar signal environment model, use pulse descriptive word PDW to describe by radar signal, PDW mainly comprises the following parameter of signal here: pulse front edge TOA time of arrival, pulse carrier frequency RF, pulse power density PD, phase place PH, pulse width PW, pulse angle of arrival AOA.
2), Radar jam signal environmental model, described Radar jam signal is divided into cheating interference signal and noise interferences.
(1) cheating interference signal model, described cheating interference signal pattern is consistent with radar signal pattern, and the environmental model of cheating interference signal is consistent with radar signal environment model, also adopts pulse descriptive word PDW to describe.
(2) noise interferences model, described noise interferences uses noise signal describing word NDW to describe, and noise signal NDW mainly comprises the following parameter of noise signal: noise modulated type NM, noise average power density PD, noise interferences bandwidth NBW; First stochastic generation noise signal sequence, prestores to noise spectrum sequence in bandwidth; On the line of flight, the noise threatening environment of each point synthesizes the effective noise power spectrum formed at this point according to each EVAC (Evacuation Network Computer Model).
3), signal of communication environmental model, described signal of communication uses signal of communication describing word SDW to describe, and signal of communication SDW mainly comprises the following parameter of signal: spectrum sequence FSS, band internal power density sequence PDSS in signal transient frequency CF, average bandwidth MBW, the wide MTW of mean time, band.
4), communication interference signals environmental model, described communication interference signals mainly uses noise describing word to describe, specifically describe same radar noise undesired signal environmental model describe.
(2) propagation model is set up, described propagation model comprises: radar signal propagation model and signal of communication propagation model, and radar signal propagation model comprises: launch loss model, free-space propagation loss model, tropospheric refraction model and to flow process absorbing model; Signal of communication propagation model comprises: launch loss model, free-space propagation loss model, diffraction loss model and ionospheric reflection model.
Step 3: set up Electromagnetic Calculation model between machine, for the calculating to electromagnetic environment between machine, first set up the Electromagnetic Calculation model based on MoM/FDTD, for the Electromagnetic Calculation of interplane, adopt Huygens face to be the calculating that boundary is decomposed into inner question and exterior problem.
Wherein inner question RWG base method of moment analyzes body heaven line, calculates the distribution of current of antenna, thus calculates the field distribution of antenna according to distribution of current;
Near field electromagnetic field wherein in the Huygens face that calculated by method of moment of exterior problem, solve equivalent current source on Huygens face and equivalent magnetic current source in conjunction with equivalence principle, then equivalent current source and magnetic current source are calculated the field distribution in aircraft environment as the driving source of FDTD.
Step 4: set up electromagnetic environment emulation computing center, described simulation calculation center is made up of double-core parallel computer, and the interplane Electromagnetic Calculation model that simulation calculation center utilizes step 2 group of planes extraneous electromagnetic signals environmental model base and step 3 to set up calculates the electromagnetic field disposing the signal environment characteristic sum interplane that electronic information is formed in flight range and adds up respectively.
Simulation calculation process is:
(1) read in the operative scenario designed in advance, correlation parameter is set;
(2) arrange and simulation process according to operative scenario, calculate every platform electronic information given viewpoint describing word characteristic parameter on Waypoint;
(3) arrange and simulation process according to operative scenario, calculate the magnetic distribution of interplane;
(4) group of planes calculated is outside and interplane electromagnetic environment characteristic parameter carries out adding up, store and processing.
Step 5: set up the visual outlet terminal that predicts the outcome, synthesis display is carried out by signal environment statistics and interplane electromagnetic environment result of calculation, the signal environment emulation statistics adopting the mode of two-dimensional electromagnetic environment display to show aircraft exterior electronic information to produce, comprises the position of the Target track displaying of aircraft, platform and external system and state display, the parameter display of platform and external system and system signal environmental simulation result; Adopt the mode of 3 D electromagnetic environment display to show interplane electromagnetic environment result of calculation, exactly the electromagnetic environment emulation data-mapping of each discrete point of interplane become different colors and draws out, showing the visual process of 3 D electromagnetic environmental data.
Owing to adopting technical scheme the present invention as above, there is following superiority:
(1) the signal description word method that present invention employs improvement carries out modeling to aircraft exterior electromagnetic signal environment, reduces signal transacting operand, improves forecasting efficiency;
(2) present invention employs the method that signal environment and Electromagnetic Calculation combine, achieve the full forecast of aircraft exterior electromagnetic environment, more effective decision support can be provided for aircraft electromagnetic spectrum management, improve accuracy and the completeness of EME forecast.
(3) apply native system and carry out EME forecast, taken into account the prediction of macroscopical electromagnetic environment and microcosmic electromagnetic environment in region, effectively can improve the accuracy of prediction.
(4) native system is except for predicting aircraft exterior radio-frequency electromagnetic environment, after revising on a small quantity, can also be used for the external radio frequency EME forecast of the systems such as all kinds of aircraft, steamer, ground surface platform or platform to model.
Accompanying drawing explanation
Fig. 1 is the structural drawing of the prognoses system of aircraft exterior radio-frequency electromagnetic environment.
Fig. 2 is the composition schematic diagram of the data center of the prognoses system of aircraft exterior radio-frequency electromagnetic environment.
Fig. 3 is the composition schematic diagram at the simulation calculation center of the prognoses system of aircraft exterior radio-frequency electromagnetic environment.
Fig. 4 is the prediction process flow diagram of the prognoses system of aircraft exterior radio-frequency electromagnetic environment.
Fig. 5 is the model base structure figure of the prognoses system of aircraft exterior radio-frequency electromagnetic environment.
Fig. 6 is aircraft exterior EME forecast process flow diagram.
Embodiment
Below in conjunction with accompanying drawing, invention is described further.
As shown in Fig. 1,2,3,4,5,6: a kind of aircraft exterior radio-frequency electromagnetic environmental forecasting system, comprise: gather electromagnetic environment parameter device, data center, simulation calculation center and visual outlet terminal device, described collection electromagnetic environment parameter device by gather radiation source, atmospheric environment, ground environment, sea environment electromagnetic environment parameter information transmission to the data center be connected by network, and be stored in the corresponding database of data center; Described data center is connected with simulation calculation center by data line, the data model information of aircraft exterior radio-frequency electromagnetic environment full forecast is transferred to the visual outlet terminal equipment be connected by video bus by described simulation calculation center, carries out electromagnetic environment synthesis display.
Fig. 1 is system construction drawing of the present invention, and be made up of electromagnetic environment parameter acquisition system, data center, simulation calculation center and visual outlet terminal part, described electromagnetic environment parameter acquisition system is made up of radar receiver, communication station and environmental system.
The composition diagram of described data center as shown in Figure 2.Data center forms, for all kinds of parameters receiving, process and stored parameter measuring system records primarily of data processing unit and disk array.These parameters to data center, are stored into the database being arranged in data center's disk array by Internet Transmission after data processing unit process.Data processing unit comprises the functional modules such as data receiver, data screening, Data classification and data processing, and the database on disk array comprises radiation source database and environment data base.
Described simulation calculation center forms primarily of computing machine, aircraft exterior electromagnetic environment emulation unit and interplane electromagnetic-field simulation unit; As shown in Figure 3.Simulation calculation center is for calculating aircraft exterior radio-frequency electromagnetic environment, and the radiation source data needed for aircraft exterior electromagnetic environment emulation unit extracts from data center and environmental data, calculate radiation source positions, carry out signal environment emulation, add up simulation result; Interplane electromagnetic-field simulation unit imports group of planes model, carries out stress and strain model, calculate electromagnetic field data in each grid, process result of calculation the space of interplane.The electromagnetic environment emulation result of aircraft exterior and interplane is transferred to visual outlet terminal finally by control module and shows.
Described visual outlet terminal equipment is for showing aircraft exterior radio-frequency electromagnetic environmental simulation result, the two-dimensional electromagnetic situation of the to the effect that aircraft exterior of display, electromagnetic environment statistical information, and the 3-D display of interplane electromagnetic field.
As shown in Figure 4, concrete implementation step is the prediction flow process of the aircraft exterior radio-frequency electromagnetic environmental forecasting method that the present invention proposes:
Step one: data encasement, according to the demand data of aircraft exterior radio-frequency electromagnetic environmental forecasting, by the parameter information of electronic information that works in parameters measuring system collection space and all kinds of environmental data, comprise the position distribution of electromagnetic radiation source, working method, signal parameter, atmospheric environment, ground environment, sea environment etc.; Determine crucial electromagnetic environment key element, sum up airborne electromagnetic environmental quality, by LAN or internet, the parameter information recorded is sent to data center, data center sets up electromagnetic environment database, parameter information after all kinds of process is stored on the disk array of data center, is divided into radiation source data and environmental data;
Step 2: set up aircraft exterior electromagnetic environment model and interplane electromagnetic environment model, the model base structure figure that system is set up as shown in Figure 5.
Described aircraft exterior electromagnetic environment model, be that the electromagnetic signal setting up electronic information produces and transmitting procedure model, comprise signal model, transmitter correlation model (launch loss, antenna direction graph model, antenna scanning model etc.) and Signal transmissions model; Confirming model applicable elements and parameter; Realistic model is set up on mathematical model basis.
Described interplane electromagnetic environment model, be the Electromagnetic Calculation model based on MoM/FDTD, select the medium parameters such as suitable dielectric constant values, conductivity, ground bottom section absorbing boundary condition is arranged, set up aircaft configuration geometric model, carry out Electromagnetic Calculation by iterative manner.And on the basis of mathematical model, set up realistic model;
Step 3: design effort scene, according to application background, carries out operative scenario analysis, determines the composition of electronic information in scene, switching on and shutting down time, application process and duty etc., and design exemplary operation scene, generates operative scenario file;
Step 4: prediction aircraft exterior radio-frequency electromagnetic environment, according to set up airborne electromagnetic environmental model, under the driving of the aerial operative scenario of typical case, calculate electromagnetic environment distribution between the distribution situation of electromagnetic signal in fleet of aircraft flight range and machine, result of calculation is analyzed, add up and shows, final realization is to the prediction of aircraft exterior radio-frequency electromagnetic environment, and the prediction flow process of aircraft exterior radio-frequency electromagnetic environment as shown in Figure 6.
The prediction flow process of aircraft exterior radio-frequency electromagnetic environment is as follows:
1), read work document scene;
2), electromagnetic environment parameter setting is carried out;
3), through electronic information position and distribution process resume module;
4) aircraft exterior radio-frequency electromagnetic environment, is carried out and interplane external radio frequency electromagnetic environment differentiates;
5), differentiate it is fleet of aircraft external radio frequency electromagnetic environment, carry out electronic information emulation in single portion in space;
A), carry out intervisibility differentiation, be determined as no single portion electronic information that returns and emulate; Differentiation is, ingoing power computing module calculates;
B), carry out differentiating in operating distance, be determined as no single portion electronic information that returns and emulate; Differentiation is, carries out scan-type calculating;
C), travel direction aims at and differentiates, is determined as noly to return the emulation of single portion electronic information; Differentiation is, carries out aircraft exterior radio-frequency electromagnetic environment and calculates;
D), carry out whole electronic information and emulated differentiation, be determined as and noly return the electronic information emulation of single portion; Differentiation is, carries out data analysis and display;
6), differentiate it is external radio frequency electromagnetic environment between machine, carry out external radio frequency electromagnetic environment between machine and calculate, and carry out data analysis and display; Be determined as no returning, then carry out external radio frequency electromagnetic environment between aircraft exterior radio-frequency electromagnetic environment and machine and differentiate;
7), to the result of data analysis and display store, terminate.
Claims (4)
1. an aircraft exterior radio-frequency electromagnetic environmental forecasting system, it is characterized in that: comprising: gather electromagnetic environment parameter device, data center, simulation calculation center and visual outlet terminal device, described collection electromagnetic environment parameter device by gather radiation source, atmospheric environment, ground environment, sea environment electromagnetic environment parameter information transmission to the data center be connected by network, and be stored in the corresponding database of data center; Described data center is connected with simulation calculation center by data line, the data model information of aircraft exterior radio-frequency electromagnetic environment full forecast is transferred to the visual outlet terminal equipment be connected by video bus by described simulation calculation center, carries out electromagnetic environment synthesis display; Described data center is made up of data processing unit and disk array, for all kinds of parameters receiving, process and stored parameter measuring system records; Described data processing unit is connected with the database of data center's disk array; Described data processing unit comprises: data receiver, data screening, Data classification and data processing function module, and the database on described disk array comprises: radiation source database and environment data base.
2. aircraft exterior radio-frequency electromagnetic environmental forecasting system according to claim 1, is characterized in that: described simulation calculation center is made up of aircraft exterior electromagnetic environment emulation unit and interplane electromagnetic-field simulation unit; Described aircraft exterior electromagnetic environment emulation unit is connected with data center by data line; Described interplane electromagnetic-field simulation unit carries out stress and strain model to the space of interplane, calculates electromagnetic field data in each grid, processes result of calculation; The electromagnetic environment emulation information of described aircraft exterior and interplane, is connected with visual outlet terminal equipment by control module.
3. aircraft exterior radio-frequency electromagnetic environmental forecasting system according to claim 1, it is characterized in that: described visual outlet terminal equipment is for showing aircraft exterior radio-frequency electromagnetic environmental simulation information, comprise display: the two-dimensional electromagnetic situation of aircraft exterior, electromagnetic environment statistical information, and the 3-D display information of interplane electromagnetic field.
4. a kind of aircraft exterior radio-frequency electromagnetic environmental forecasting method of aircraft exterior radio-frequency electromagnetic environmental forecasting system as claimed in claim 1, is characterized in that: its step is as follows:
Step one: set up electromagnetic environment parameter data center, by gathering the electromagnetic environment parameter setting up radiation source, atmospheric environment, ground environment, sea environment, setting up electromagnetic environment parameter database, and being stored on the large storage facilities of disk array; By LAN or internet by gathered parameters information transmission to data center, store in typing central database after data processing;
Step 2: set up spacing wave environmental model base
(1) set up signal description model, the signal description word modeling method of application enhancements, set up radar signal environment model/Radar jam signal environmental model, signal of communication environmental model/communication interference signals environmental model;
1), radar signal environment model, use pulse descriptive word PDW to describe by radar signal, PDW mainly comprises the following parameter of signal here: pulse front edge TOA time of arrival, pulse carrier frequency RF, pulse power density PD, phase place PH, pulse width PW, pulse angle of arrival AOA;
2), Radar jam signal environmental model, described Radar jam signal is divided into cheating interference signal and noise interferences;
(1) cheating interference signal model, described cheating interference signal pattern is consistent with radar signal pattern, and the environmental model of cheating interference signal is consistent with radar signal environment model, also adopts pulse descriptive word PDW to describe;
(2) noise interferences model, described noise interferences uses noise signal describing word NDW to describe, and noise signal NDW mainly comprises the following parameter of noise signal: noise modulated type NM, noise average power density PD, noise interferences bandwidth NBW; First stochastic generation noise signal sequence, prestores to noise spectrum sequence in bandwidth; On the line of flight, the noise threatening environment of each point synthesizes the effective noise power spectrum formed at this point according to each EVAC (Evacuation Network Computer Model);
3), signal of communication environmental model, described signal of communication uses signal of communication describing word SDW to describe, and signal of communication SDW mainly comprises the following parameter of signal: spectrum sequence FSS, band internal power density sequence PDSS in signal transient frequency CF, average bandwidth MBW, the wide MTW of mean time, band;
4), communication interference signals environmental model, described communication interference signals mainly uses noise describing word to describe, specifically describe same radar noise undesired signal environmental model describe;
(2) propagation model is set up, described propagation model comprises: radar signal propagation model and signal of communication propagation model, and radar signal propagation model comprises: launch loss model, free-space propagation loss model, tropospheric refraction model and to flow process absorbing model; Signal of communication propagation model comprises: launch loss model, free-space propagation loss model, diffraction loss model and ionospheric reflection model;
Step 3: set up Electromagnetic Calculation model between machine, for the calculating to electromagnetic environment between machine, first set up the Electromagnetic Calculation model based on MoM/FDTD, for the Electromagnetic Calculation of interplane, adopt Huygens face to be the calculating that boundary is decomposed into inner question and exterior problem;
Wherein inner question RWG base method of moment analyzes body heaven line, calculates the distribution of current of antenna, thus calculates the field distribution of antenna according to distribution of current;
Near field electromagnetic field wherein in the Huygens face that calculated by method of moment of exterior problem, solve equivalent current source on Huygens face and equivalent magnetic current source in conjunction with equivalence principle, then equivalent current source and magnetic current source are calculated the field distribution in aircraft environment as the driving source of FDTD;
Step 4: set up electromagnetic environment emulation computing center, described simulation calculation center is made up of double-core parallel computer, and the interplane Electromagnetic Calculation model that simulation calculation center utilizes step 2 group of planes extraneous electromagnetic signals environmental model base and step 3 to set up calculates the electromagnetic field disposing the signal environment characteristic sum interplane that electronic information is formed in flight range and adds up respectively;
Simulation calculation process is:
(1) read in the operative scenario designed in advance, correlation parameter is set;
(2) arrange and simulation process according to operative scenario, calculate every platform electronic information given viewpoint describing word characteristic parameter on Waypoint;
(3) arrange and simulation process according to operative scenario, calculate the magnetic distribution of interplane;
(4) group of planes calculated is outside and interplane electromagnetic environment characteristic parameter carries out adding up, store and processing;
Step 5: set up the visual outlet terminal that predicts the outcome, synthesis display is carried out by signal environment statistics and interplane electromagnetic environment result of calculation, the signal environment emulation statistics adopting the mode of two-dimensional electromagnetic environment display to show aircraft exterior electronic information to produce, comprises the position of the Target track displaying of aircraft, platform and external system and state display, the parameter display of platform and external system and system signal environmental simulation result; Adopt the mode of 3 D electromagnetic environment display to show interplane electromagnetic environment result of calculation, exactly the electromagnetic environment emulation data-mapping of each discrete point of interplane become different colors and draws out, showing the visual process of 3 D electromagnetic environmental data.
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