CN108471334A - The method of test assessment data-link LPI performances - Google Patents
The method of test assessment data-link LPI performances Download PDFInfo
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- CN108471334A CN108471334A CN201810143422.2A CN201810143422A CN108471334A CN 108471334 A CN108471334 A CN 108471334A CN 201810143422 A CN201810143422 A CN 201810143422A CN 108471334 A CN108471334 A CN 108471334A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/29—Performance testing
Abstract
The invention discloses a kind of methods of test assessment data-link LPI performances, can reduce its radio signal strength emitted outward using the present invention, optimize radiation feature, promote test equipment ability of anti-interception.The technical scheme is that：Under microwave dark room environment, data-link antenna 1, data-link antenna 2 complete the communication function of data-link, and 1 signal of communication of microwave antenna completion data-link antenna detects receipts, while excluding the interference signal of data-link antenna 2；The scenario drive system setting of industrial personal computer meets the value of the Power control range and stepping requirement of data-link, the discrete track points of automatic imitation and continuous flight path section；The analysis assessment system of industrial personal computer by existing place size and with the equivalent conversion of the communication distance obtained under the conditions of examination and engagement range to really taking a flight test in the air scene, obtain Power control range, the stepping of data-link, calculate the communication LPI quality factors of data-link.
Description
Technical field
The present invention relates under a kind of microwave dark room environment, the Power control range of test data chain, stepping and communication are low
The method of intercept probability (Low probability of intercept, LPI) quality factor, the LPI for assessing data-link
Performance.
Background technology
With information-based continuous development, the continuous expansion that spatial electromagnetic equipment uses, complex electromagnetic environment occurs great
Change, electromagnetic environment complicated and changeable, not only influences the safety and device performance of electronic equipment, but also directly shadow electronic equipment
The performance of energy, seriously affects the decline of communication quality.EMC test is the reasonable of verification EMC Design of Electronic Equipment
Property and final evaluation electronic equipment quality means, since wireless channel is an open space, to its medium characteristic
It destroys and upsets, will equally hinder the transmission of signal.In actual channel, noise is constantly present with interference.Commercial communication, it is special
It is not present mobile communication, under conditions of electromagnetic environment is increasingly sophisticated, the anti-interference ability of itself is also one very heavy
The index wanted.In order to scientifically evaluate the Electro Magnetic Compatibility of electronic equipment under fading environment in radio, it is necessary to various interference
The interference emission measure in source interferes the interference susceptibility of transmission characteristic and electronic equipment to be quantitative determined.By quantitative determining,
It can differentiate whether product meets EMC Standard or specification；It finds out in product design and production process in Electro Magnetic Compatibility
The weak link of aspect provides relevant data for user installation and using product.Therefore, emc testing is that electronics is set
Indispensable important link in standby development, production process.Pulse is used for electromagnetic environment radiant source target that may be present
Describing word (PDW) electromagnetic radiation signal, the signal cannot reflect that true electromagnetic signal, simulation result do not have convincingness.
In terms of measuring technology, it is based on electromagnetic wave propagation theory, the prior art proposes duskiness room, near field simulation open space actual environment
Test method, the transmission function between the dual-mode antenna of near field is determined using Microwave Net identification technology, realization exists in real time
Line radio frequencyChannelQuantitative measurment reduces passive intermodulation, solves high power protection and electromagnetic compatibility problem, completes microwave dark room fortune
The design of the mechanical structure, control system, software and communication system of moving platform, and system index is assessed, although can
Indoor reproduction true to nature is carried out to complex electromagnetic environment, but darkroom improvement cost is excessively high, it is difficult to a wide range of to promote.Microwave dark room was both
Suitable miniaturized electronics also are adapted for the radiation field immunity test and radiation field emission measurement of large scale electronic equipment.
Wireless software download is the important component of electronic apparatus system, and the reliability of data-link is to influence electronic equipment
The key factor of reliability service, channel coding are to improve the important channel of data-link reliability.Data-link is disappearing according to regulation
Format and communication protocol are ceased, various modulation-demodulation techniques, error correction coding, group-net communication technology and information integration technology are utilized
Deng, in a manner of Bit Oriented ground/sky of real-time Transmission formatted digital information, it is empty/empty ,/ground between wireless data communication
System.Nonlinear stepped frequency signal has good secondary lobe and grating lobe suppression performance, and improving data transfer rate means the reduction of umber of pulse N
With the increase of stepped intervals Δ f.Data-link test system composition measured data catenary system performance indicator covering radio-frequency performance, when
Between synchronization, signal format, image procossing,Electromagnetic compatibility, antenna tracking etc..Currently, being compiled to electronic device data chain channel
There are two types of the analogy method of code is general, one is Digital Simulation, it realistically analogue data chain channel coding cannot actually fly
Performance under row scene.Another kind is that progress actual tests or field draw the distance test (DT) this method test periods long, coding,
Generate channel coding code stream；Transmission channel model load does not have recoverability according to data-link transmission, and test data is extracted
Difficulty, experimentation cost are high.Traditional data-link test method is mostly based on the static properties parameter detecting of Transmission system, it is difficult to right
The transient state abnormal conditions that data-link occurs, which are made, correctly to be judged, unlikely carries out dynamic simulation survey to normal use situation
Examination, finally also cannot effectively ensure data-link fault-free reliability application.Traditional instrument drive technology is needed according to difference
Manufacturer production instrument and write corresponding instrument drive code, increase the complexity of system；And the actuation techniques are used, it needs
The script file that particular meter is write according to unified format, needs real-time resolving interference source and communication receiver relative to communication
The azimuth of sender, pitching angle information are crossed by angle than switching at runtime microwave switch, realize that the signal in interference simulation source is defeated
Go out.When available different model instrument increases, original program can not drive the new model instrument, limit the spirit of system
Autgmentability living, does not meet the requirement of programming.Prior art hardware composition data chain tests system mainly by industrial computer
It is formed with data-link analog module.Computer-internal extends multiple RS-422 serial line interfaces and USB2.0 interfaces.It is wherein external
RS-422 mouthfuls, for transmitting bi-directional serial data with data-link test system, receive command information, and connect by internal RS422
The status information of data-link transmission is transmitted to data-link and tests system by mouth, while can also be referred to data-link analog machine
Enable control.Industrial computer is additionally operable to test, and receives the order of data-link test system or by locally generated order, passes through number
Interface programmable attenuator, internal grafting PCI-9846 high-speed data acquisition cards, is completed at the acquisition and image analysis of image data
Reason, and realize image storage and playback.Dynamic link library and system configuration file are the main contents of software services layer, in software
Service layer realizes management and scheduling driver to hardware board, and completes interface service layer and turn between hardware interface
It changes.Test antenna duskiness room shielding case, which is placed in, to be mounted on antenna measured body, and the high-power letter of equipment under test transmitting is received
Number, and have a degree of shielding action to the transmitting signal of equipment under test.Test antenna duskiness room shielding case is designed as just
Square-section, top surface are parallel to ground.Test antenna duskiness room shielding case bottom needs to be total to apparatus body boundary curve
Shape designs, and bottom covers thicker electromagnetic-wave absorbing rubber material, not only can be with electromagnetic wave absorption, but also can further realize conformal set
Meter；The design of internal antenna uses wideband circular monopole antenna, can meet the requirement of size, weight and bandwidth.Flight
Device is carried out wireless communication using ultrashort wave, and the propagating characteristic of radio wave is straightline propagation, and propagation has initially encountered asking for sighting distance
Topic.In a communication link, there is also the multipath components caused by different propagation paths in vehicular communication system.While and microwave
Communication channel is similar, and there are stronger ground-reflected waves in aircraft communication channel, constitute two diameter channel models.In addition, due to
There are certain flying speeds for aircraft, it is also contemplated that Doppler effect caused by it.Limit line-of-sight propagation distance is for ultrashort
For wave, wavelength is generally all at several meters and within the scope of several centimetres, so it does not walk around common barrier.Because ultrashort
Wave can penetrate ionosphere, can not be propagated by ionospheric reflection as shortwave.So ultrashort propagation is first
The problem of encountering sighting distance.In practical air communications link, in troposphere, therefore at least part of route of transmission is
This transmission medium must be influenced by troposphere, due to and non-uniform dielectric, its temperature humidity and air pressure with
When ask and spatial variations, thus will produce refraction and absorbing phenomenon, the air line distance realized and propagated will be directly affected.
The electromagnetic environment that modern electronic equipment faces is complicated, and field testing is easily disturbed and multi-path influence, needs in microwave
Various LPI indexs are tested under dark room conditions.Data-link is as important radio frequency sensor, in order to improve the LPI performances of data-link,
Use a variety of LPI measures such as radiant power control, orientation narrow beam, communication low probability of intercept LPI waveforms.In order to assess data
The LPI performances of chain need leading indicator to be tested to have Power control range, stepping and communication LPI quality factors etc..Data-link
Power control mainly realized by automatic adjusument communication distance, transmission rate, link margin.The power control of LPI is
It avoids being trapped.At home and abroad in existing literature data, how under microwave dark room environment to data-link Power control range, step
Into and communication LPI quality factors carry out test and evaluation, not yet see detailed, ripe test and evaluation method.Only setting
Assessment test is carried out to the Power control range and stepping index of data-link in standby development process, test content includes that microwave is dark
Automated power control during manual power control in room is tested and taken a flight test in the air is tested, but tests existing defects.In microwave
In dark room conditions, since the dead-space characteristic and size of dark room test scene limit, manual power control test can investigate power control
The satisfaction property of index processed, is not able to verify that power control strategy.It takes a flight test in the air in environment, because of the reproducibility of Flight Test scene
Poor and data-link radiation signal feature cannot be accurate controlled, and automated power control test can investigate the effective of power control strategy
Property, but it is unable to quantitative verification index.For communicating the test evaluation studies of LPI quality factors, the definition of index is simply shown
And its analysis of Influential Factors, the theoretical calculation formula of typical data chain communication LPI quality factors is derived, but do not provide index
Test and evaluation method.
Communication low probability of intercept LPI performance test and evaluations are the reasonability for verifying electronic equipment LPI designs and most final review
It is indispensable in electronic equipment development, production process that the means of valence electron equipment LPI level height, which are performance test and evaluations,
Important link.Pass through quantitative determination, it is possible to authenticate whether product meets LPI performance requirements, finds out product design and produced
In the weak link of LPI aspect of performance in journey, relevant data are provided for user's Curve guide impeller.
Do not have convincingness for field testing electromagnetic environment multipath that may be present and interference, test result.It is testing
Technical aspect, at present under microwave dark room and ground external field environment, Power control range and stepping to electronic equipment carry out
Test.However there are problems that two：First, current test is all the static test under manual power control mode, by operating
Person selects different power grades to carry out radiant power test, and what is really applied on an electronic device is adaptive power control
System, this requires being continuously monitored to radiant power in electronic equipment course of normal operation, dynamic test；Second is that by power
The sensitivity of the instrument and equipments such as meter, frequency spectrograph limits, and when transmitting terminal power control quantity is larger, can not carry out effective survey of power
Examination, it is difficult to verify the Larger Dynamic index of power control.
In conclusion the test evaluation problem about data-link LPI performances, on the one hand, in domestic and international existing literature data,
Lack test and evaluation method in detail, ripe；On the other hand, the complexity of test environment is also brought to test job huge
Challenge.Therefore, under microwave dark room environment, data-link Power control range, stepping and communication LPI quality factors are provided
Test and evaluation method is critical issue urgently to be resolved hurrily in data-link LPI performance tests evaluation work at this stage.
Invention content
The purpose of the present invention is being directed to the prior art there are problem, propose that a kind of quantitative test precision is high, automatization level
High, reliable operation can carry out data-link LPI levels quantitative appraisal, the side of test assessment data-link LPI quality factor performances
Method, to solve the evaluation problem of data-link LPI performances.
The above-mentioned purpose of the present invention can pass through the scenario drive system of industrial personal computer, data-link antenna 1 and data-link antenna 2
Covert communications, Acquisition Receiver is to the all-probabity interception of 2 signal of communication of data-link antenna, analysis assessment system of industrial personal computer etc.
Four measures reach.A method of test assessment data-link LPI performances, it is characterised in that include the following steps：Microwave is dark
Under room environmental, the signal of communication and interference signal that data-link antenna 1, data-link antenna 2 that communication distance is D are emitted pass through
Microwave antenna injects Acquisition Receiver, and the scenario drive system of industrial personal computer is injected by data-link terminal 1, data-link terminal 2；Work
Control machine scenario drive system foundation space target position information simulation distance change, maximum target distance and minimum target distance,
Setting meets the performance number of data-link Power control range and stepping requirement, the discrete track points of automatic imitation and continuous flight path
Section；The summation of the signal of communication received and interference signal is sent to the analysis of industrial personal computer by Acquisition Receiver by microwave cable
Assessment system, industrial personal computer analyze assessment system, calculate the signal of communication and data-link antenna 2 of radio-communication data chain antenna 1
Interference signal spatial decaying, exclude the interference signal of data-link antenna 2, automatic adjustment data-link terminal 1 and data
The transmission rate of chain terminal 2, the front end attenuation of link margin and Acquisition Receiver, the different communication that will be measured in experiment
Radiant power, maximum radiated power at distance, lowest radiating power are compared, and method of comparison measures Power control range and step
Into by existing place size and with the equivalent conversion of the communication distance obtained under the conditions of examination and engagement range to true field of taking a flight test in the air
Scape calculates the communication LPI quality factors of data-link.
The present invention has the advantages that：
Quantitative test precision is high.The present invention is adjusted in synchronism the chain of data-link by scenario drive system under microwave dark room environment
The front end attenuation of road surplus, transmission rate and Acquisition Receiver arrives separately at marginal communication state and critical acquisition mode, surveys
Communication distance and engagement range, then by the analysis assessment system of industrial personal computer by the communication distance measured in experiment, section
Obtain distance, the link margin of data-link and transmission rate and Acquisition Receiver front end attenuation etc., it is equivalent conversion arrive actual field
Communication distance under scape and engagement range obtain Power control range, the stepping of data-link using method of comparison, communication are calculated
LPI quality factors, quantitative test precision are high.By the Power control range of test equipment, stepping and communication LPI qualities because
Son assesses the LPI abilities of data-link, can reduce its radio signal strength emitted outward, optimizes radiation feature, enables test
The survival ability and communication capacity of equipment are highly improved.
Automatization level is high.The present invention automatically controlled by the scenario drive system of industrial personal computer data-link on off state,
Operating mode, LPI waveforms, radiation spatial domain etc. automatically adjust the link margin of data-link, transmission rate and Acquisition Receiver
Front end attenuation, the discrete track points of automatic imitation and continuous flight path section, realize LPI performance indicators test assessment, have compared with
High automatization level.
Reliable operation.Link margin, transmission rate and the intercepting and capturing of scenario drive system automatic adjustment data-link of the present invention
The front end attenuation of receiver, the discrete track points of automatic imitation and continuous flight path section, according to the simulation of current time data-link
The switching of the front end attenuation, microwave switch of location information, antenna scanning center and day line options real-time control Acquisition Receiver
Corresponding microwave antenna gives off true interference signal in darkroom, and the static microwave darkroom scenario simulation with contracting ratio is true
Dynamic air is taken a flight test scene, ensures the all-probabity interception to data-link signal, reliable operation.The analysis assessment system of industrial personal computer,
Calculate spatial decaying and space target position information simulation distance change, the maximum target of radio-communication data chain signal
Distance and minimum target distance, setting are met the value of the Power control range and stepping requirement of data-link, are opened and covered using frequency domain width
The frequency sweeping ranges of lid data-link signal, using the beam coverage of the wide open covering data-link signal in spatial domain, using oblique pole
Change avoids big polarization mismatch.
The present invention is suitable for data-link Power control range under microwave dark room environment, stepping and communication LPI quality factors
Test, for instructing and improving for data-link LPI technologies, can have weight with the LPI performance levels of qualitative assessment data-link
Want meaning.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the data-link microwave dark room test scene schematic diagram of the present invention.
Fig. 2 is data-link signal link transmission schematic diagram of the present invention.
Fig. 3 is data-link communication LPI quality factor schematic diagrames of the present invention.
Specific implementation mode
Refering to fig. 1.In microwave dark room test scene, solid line indicates that data-link communication link, dotted line indicate that data-link is cut
Obtain link.Absorbing material eliminates the interference signal of data-link terminal 2.Data-link is under the action of radio frequency system management and control, using spoke
It penetrates the technologies such as power control, orientation narrow beam, LPI waveforms and realizes covert communications.Acquisition Receiver AFE(analog front end) spatial declines
Subtract, the signal of data end of the chain machine 1 is carried out to detect receipts, the beam position different according to data-link can be detectd and receive main lobe signal or pair
Valved signal.For the all-probabity interception for meeting to data-link signal, the frequency of the scenario drive system setting Acquisition Receiver of industrial personal computer
Rate range and antenna are directed toward, the analog carriers such as on off state, operating mode, LPI waveforms, radiation spatial domain of management and control data-link
Posture, position, height and velocity information calculate the spatial decaying of data-link signal.Data-link is operated in different formation
Distance radiates different power, and signal is using specified test frequency point.During experiment, discrete track points can be tested,
Continuous flight path section can be tested.
Under microwave dark room environment, by the signal of communication that emits of data-link antenna 1, data-link antenna 2 that communication distance is D with
Interference signal injects Acquisition Receiver by microwave antenna.The scenario drive system of industrial personal computer is according to space target position information
Simulated range variation, maximum target distance and minimum target distance, setting meets the Power control range of data-link and stepping is wanted
The value asked, the discrete track points of automatic imitation and continuous flight path section.Acquisition Receiver is by the signal of communication received and interference
The summation of signal is sent to the analysis assessment system of industrial personal computer by microwave cable.The analysis assessment system of industrial personal computer calculates nothing
The signal of communication of line telecommunication data-link antenna 1 and the decaying of the spatial of the interference signal of data-link antenna 2, exclude data-link
Transmission rate, link margin and the intercepting and capturing of the interference signal of antenna 2, automatic adjustment data-link terminal 1 and data end of the chain machine 2 connect
The front end attenuation of receipts machine, by the radiant power at the different communication distance measured in experiment, maximum radiated power, minimum spoke
It penetrates power to be compared, method of comparison measures Power control range and stepping, by existing place size and with obtaining under the conditions of examination
Communication distance and the equivalent conversion of engagement range calculate the communication LPI quality factors of data-link to true scene of taking a flight test in the air.
Scenario drive system is in the progradation of scenario, with the true dynamic of static microwave darkroom scenario simulation of contracting ratio
Aerial scene of taking a flight test, adjusts the link margin and transmission rate of data-link, until reaching marginal communication state, i.e. packet loss and mistake
Code check is just above limit value.The front end attenuation of Acquisition Receiver is adjusted, until reaching critical acquisition mode, i.e. parameter measurement error
Just above limit value.To solve the limitation of microwave dark room place size and the limitation with strip part, industrial personal computer analysis assessment system
System using Acquisition Receiver front end attenuation, by existing place size and with the communication distance that is obtained under the conditions of examination and intercept and capture away from
From measuring Power control range and stepping by method of comparison, equivalent conversion is to true scene and the manufacture claim of taking a flight test in the air with trying
Under the conditions of communication distance and engagement range, calculate the communication LPI quality factors of data-link.
Refering to Fig. 2.Under microwave dark room environment, in Power control range and stepping measurement, industrial personal computer analysis assessment system
System measures Power control range X, X=max [P by method of comparisoni]-min[Pi]=max [Li]-min[Li] and power control step
Into χi, χi=Pi-Pi-1=Li-Li-1, calculate the radiant power under data-link power control
Pi=δ+Ll+Li+Lm-Gr+ L L=32.44+20log10(R)+20log10(f)
In formula, δ is Acquisition Receiver sensitivity (dBm), Ll(dB) is lost for feeder loss plus amplitude limit, LiFor data-link power control
The front end attenuation (dB) of the lower Acquisition Receiver of system, LmFor mismatch loss (dB), GrIt is to intercept and capture link for receiving antenna gain (dB), L
Free space attenuation value (dB), R are microwave antenna (km) at a distance from data-link antenna, and f is signal frequency (MHz), max [g]
It indicates to be maximized respectively with min [g] and minimum value.
By above formula as it can be seen that by method of comparison, various intrinsic parameters δ, L of Acquisition Receiver can be eliminatedl、Lm、GrAnd L
The influence that Power control range and stepping are tested.
In experiment, the Effective Radiated Power P of data-link is not demarcated, but can be assumed that in the experiment twice of equivalent conversion, is had
Imitate the various intrinsic parameters constants of radiant power P and data-link.In data-link communication link, LpAnd G/T is data-link
Various intrinsic parameters, f and D are experiment known quantity.Therefore only need to measure transmission rate Rb and link margin Th during experiment,
The Effective Radiated Power P calculation formula of data-link are
P=10log10(Rb)+Lp+Th-G/T+Ld, Ld=32.44+20log10(f)+20log10(D)
In formula, Rb is transmission rate (bps), Lp(dB) is lost to be directed toward loss hyper polarization, Th is link margin (dB), and G/T is
Antenna G/T values (dB/K), LdIt is data-link communication distance (km) for communication link free space attenuation (dB), D.
It is assumed that the Effective Radiated Power P tested twice is kept constant, have
10log10(Rb1)+Th1+20log10(D1)=10log10(Rb2)+Th2+20log10(D2)
Substitute into the distance between two width antenna of data-link D in experiment1, the link margin Th of setting1With transmission rate Rb1, conversion arrives
Link margin Th2With transmission rate Rb2When, the practical communication distance D of data-link2。
In engagement range conversion, industrial personal computer analyzes assessment system according to the distance between microwave antenna and data-link antenna
R1With front end attenuation Lf1, convert and obtain the equivalent engagement range under real system sensitivity.Similarly, in experiment, data-link has
Effect radiant power P is not demarcated, but can be assumed that in the experiment twice of equivalent conversion, Effective Radiated Power P and Acquisition Receiver
Various intrinsic parameters constants.In data-link intercepts and captures link, P calculation formula are
P=δ+Ll+Lf+Lm-Gr+32.4+20log10(f)+20log10(R)
Wherein, δ, Ll、LmAnd GrFor the various intrinsic parameters of Acquisition Receiver, f and R are experiment known quantity.Therefore during experiment
It only needs to measure front end attenuation Lf。
It is assumed that the Effective Radiated Power P tested twice is kept constant, have
Lf1+20log10(R1)=Lf2+20log10(R2)
Substitute into the distance between microwave antenna and data-link antenna R in experiment1, the front end attenuation L of settingf1, convert to intercepting and capturing and connect
The practical engagement range R of receipts machine2When, front end attenuation Lf2=0.
In communication LPI quality factors calculate, the analysis assessment system of industrial personal computer defines LPI quality factors and is
In formula, D is by the communication distance (km) of the communication link between data-link terminal 1 to data-link terminal 2, and R is to intercept and capture
Receiver (km), Q at a distance from intercepted data chain between data-link terminal 1ANTFor antenna quality factor (dB), QISPress down for interference
Product prime factor (dB), QMODFor modulation quality factor (dB), QATMFor air quality factor (dB).
1) as D ＞ R, the communication distance of data-link is more than engagement range of the Acquisition Receiver to data-link, at this point, QLPI
＞ 0, data-link can be completed to communicate, be detected without being trapped receiver, it is believed that data-link is low intercepting and capturing to this Acquisition Receiver
, QLPIBigger, low intercepting and capturing quality is better.
As D ＜ R, the communication distance of data-link is less than engagement range of the Acquisition Receiver to data-link, at this point, QLPI＜
0, data-link not yet completes communication and is just trapped receiver and detects, it is believed that data-link is non-low intercepting and capturing to this Acquisition Receiver
, QLPISmaller, low intercepting and capturing quality is poorer.
As D=R, the communication distance of data-link is suitable to the engagement range of data-link with Acquisition Receiver, is in low section
Obtain critical condition.
Claims (10)
1. a kind of method of test assessment data-link LPI performances, it is characterised in that include the following steps：Under microwave dark room environment,
The signal of communication and interference signal that data-link antenna 1, data-link antenna 2 that communication distance is D are emitted, are noted by microwave antenna
Enter Acquisition Receiver, the scenario drive system of industrial personal computer is injected by data-link terminal 1, data-link terminal 2；Industrial personal computer scenario is driven
Dynamic system meets number according to space target position information simulation distance change, maximum target distance and minimum target distance, setting
According to the performance number that chain Power control range and stepping require, the discrete track points of automatic imitation and continuous flight path section；Intercepting and capturing connect
The summation of the signal of communication received and interference signal is sent to the analysis assessment system of industrial personal computer by receipts machine by microwave cable,
Industrial personal computer analyzes assessment system, calculates the interference signal of the signal of communication and data-link antenna 2 of radio-communication data chain antenna 1
Spatial decaying, exclude the interference signal of data-link antenna 2, the biography of automatic adjustment data-link terminal 1 and data end of the chain machine 2
The front end attenuation of defeated rate, link margin and Acquisition Receiver, by the spoke at the different communication distance measured in experiment
It penetrates power, maximum radiated power, lowest radiating power to be compared, method of comparison measures Power control range and stepping, will be existing
Place size and with the equivalent conversion of the communication distance obtained under the conditions of examination and engagement range to true scene of taking a flight test in the air, calculating number
According to the communication LPI quality factors of chain.
2. the method for test assessment communication data chain LPI performances as described in claim 1, it is characterised in that：Acquisition Receiver
AFE(analog front end) spatial is decayed, and carries out detecing receipts to the signal of data end of the chain machine 1, and the beam position different according to data-link is detectd
Receive main lobe signal or secondary lobe signal.
3. the method for test assessment communication data chain LPI performances as described in claim 1, it is characterised in that：To meet logarithm
According to the all-probabity interception of chain signal, frequency sweeping ranges and spatial domain of the Acquisition Receiver using the wide open covering data-link signal of frequency domain
The beam coverage of wide open covering data-link signal, big polarization mismatch is avoided using inclined polarization, according to current time data
Analog position information, antenna scanning center and the antenna of chain select the front end attenuation of real-time control Acquisition Receiver.
4. the method for test assessment communication data chain LPI performances as described in claim 1, it is characterised in that：Industrial personal computer scenario
Drive system is taken a flight test field in the progradation of scenario with the true dynamic air of static microwave darkroom scenario simulation of contracting ratio
Scape adjusts the link margin and transmission rate of data-link, until it is critical logical just above limit value to reach packet loss and the bit error rate
Letter state.
5. the method for test assessment communication data chain LPI performances as described in claim 1, it is characterised in that：To solve microwave
The limitation of darkroom place size and the limitation with strip part, industrial personal computer analyze 1 He of assessment system automatic adjustment data-link terminal
The transmission rate of data-link terminal 2, the front end attenuation of link margin and Acquisition Receiver, the difference that will be measured in experiment
Radiant power, maximum radiated power at communication distance, lowest radiating power are compared, and method of comparison measures Power control range
And stepping, by existing place size and with the equivalent conversion of the communication distance obtained under the conditions of examination and engagement range to true aerial examination
Fly scene, calculates the communication LPI quality factors of data-link.
6. the method for test assessment communication data chain LPI performances as described in claim 1, it is characterised in that：In microwave dark room
Under environment, in Power control range and stepping measurement, industrial personal computer analyzes assessment system and measures power control model by method of comparison
Enclose X, X=max [Pi]-min[Pi]=max [Li]-min[Li] and power control stepping χi, χi=Pi-Pi-1=Li-Li-1, meter
Calculate the radiant power under data-link power control
Pi=δ+Ll+Li+Lm-Gr+ L L=32.44+20log10(R)+20log10(f)
In formula, δ is Acquisition Receiver sensitivity, LlFor feeder loss plus amplitude limit loss value, LiTo be intercepted and captured under data-link power control
The front end attenuation value of receiver, LmFor mismatch loss value, GrFor receiving antenna gain value, L is to intercept and capture link free space attenuation
Value, R are microwave antenna with data-link antenna at a distance from, and f is signal frequency, max [g] and min [g] indicate to be maximized respectively with
Minimum value.
7. the method for test assessment communication data chain LPI performances as described in claim 1, it is characterised in that：In communication distance
In conversion, industrial personal computer analyzes assessment system according to the distance between two width antenna of data-link D1, link margin Th1And transmission speed
Rate Rb1, convert and obtain the equivalent communication distance under real system sensitivity.
8. the method for test assessment communication data chain LPI performances as described in claim 1, it is characterised in that：It is logical in data-link
Believe in link, the Effective Radiated Power P of data-link is
P=10log10(Rb)+Lp+Th-G/T+Ld, Ld=32.44+20log10(f)+20log10(D)
In formula, Rb is transmission rate, LpTo be directed toward loss hyper polarization loss, Th is link margin, and G/T is antenna G/T values, LdFor
Communication link free space attenuation value, D are data-link communication distance.
9. the method for test assessment communication data chain LPI performances as described in claim 1, it is characterised in that：In engagement range
In conversion, industrial personal computer analyzes assessment system according to the distance between microwave antenna and data-link antenna R1With front end attenuation Lf1, folding
Calculation obtains the equivalent engagement range under real system sensitivity.
10. the method for test assessment communication data chain LPI performances as described in claim 1, it is characterised in that：In communication LPI
During quality factor calculates, industrial personal computer analysis assessment system defines LPI quality factors and is
In formula, D is by the communication distance of the communication link between data-link terminal 1 to data-link terminal 2, and R is to intercept and capture to receive
Machine is between data-link terminal 1 at a distance from intercepted data chain, QANTFor antenna quality factor, QISFor AF panel quality factor,
QMODTo modulate quality factor, QATMFor air quality factor.
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