CN104618135A - Distributive data link communication testing system for spread-spectrum system - Google Patents

Abstract

The invention provides a distributive data link communication testing system for a spread-spectrum system. The distributive data link communication testing system comprises a direct-spread data link signal emitter simulation element, a frequency hopping data link signal emitter simulation element, a channel simulation element, a direct-spread data link receiver simulation element, a frequency hopping data link receiver simulation element and a system control management member, wherein the system control management member is under a federation management mode for managing the operation of the whole federation, sending a control instruction and finishing the interaction state. According to the system, the HLA-RTI technology is carried out achieve synchronous communication and interaction of all elements, so as to ensure that all parts of the system are coordinated and sequentially operated; therefore, a stable and expandable data link communication testing system is constructed to perform simulation test for a signal emitter, a channel and a receiver of a data link communication system.

Description

A kind of distributed data chain communication test system towards spread spectrum system

Technical field

The present invention relates to electroporation field, be specifically related to a kind of distributed data chain communication test system towards spread spectrum system.

Background technology

Spread spectrum technic has the advantages such as low by intercept probability, antijamming capability is strong, has become the key technology in data link communications system, has been widely used in the communications field.Existing data link communications system is mostly to simple terminal, as the functions such as the generation of Data-Link signal, transmission and reception are tested, do not carry out control and the management of system from state synchronized, time synchronized angle, therefore processing procedure correctness and ageingly cannot reach test request.

Summary of the invention

The application is by providing a kind of distributed data chain communication test system towards spread spectrum system, HLA-RTI technology is adopted to realize synchronous communication between each member with mutual, ensure that system components harmonious orderly runs, thus establish stable, extendible Data-Link communication test system, realize the emulation testing to Data-Link communication system signal transmitter, channel, receiver, to solve the correctness of existing data link communications system processing procedure and the ageing technical problem that cannot reach test request.

For solving the problems of the technologies described above, the application is achieved by the following technical solutions:

A kind of distributed data chain communication test system towards spread spectrum system is made up of hardware and software two parts, hardware components comprises 5 computers and a station server, for software member provides operation hardware running environment, software section comprises DS Data-Link signal transmitter simulated members, frequency-hopped data chain signal transmitter simulated members, channel simulator member, DS Data-Link receiver simulated members, frequency-hopped data chain receiver simulated members and Systematical control management member, wherein:

Described DS Data-Link signal transmitter simulated members, according to parameters such as transmission data, carrier frequency, modulation system, pseudo random sequence producing method, DS processing mode and pseudo-bit rates, emulation produces DS Data-Link signal;

Described frequency-hopped data chain signal transmitter simulated members, produces frequency-hopped data chain signal according to parameters simulations such as transmission data, pseudo random sequence producing method, DS processing mode, frequency hop sequences producing method, Hopping frequencies, modulation system, Frequency Hopping Signal residence times;

Described channel simulator member, comprise by DS Data-Link signal transmitter simulated members to DS Data-Link signal receiver simulated members with by two signal channels of frequency-hopped data chain transmitter simulated members to frequency-hopped data chain receiver simulated members, for decaying to DS Data-Link signal and frequency-hopped data chain signal, add process of making an uproar;

Described DS Data-Link receiver simulated members, for carrying out reception process emulation to the DS Data-Link signal after the process of channel simulated members, realizes the crucial process such as the DS synchronization acquistion to DS Data-Link signal, DS synchronized tracking and demodulation;

Described frequency-hopped data chain receiver simulated members, for carrying out reception process emulation to the frequency-hopped data chain signal after the process of channel simulated members, realizes catching the frequency-hopping synchronization of frequency-hopped data chain signal, frequency-hopping synchronization trackings, demodulation etc. is crucial processes;

Described Systematical control management member adopts federation management pattern, is responsible for the operation of whole federation, sending controling instruction completion status is mutual.It manages the operation of whole federation, comprise create federal, cancel federation, start test, suspend test, continue test and display testing time etc.

Preferably, DS Data-Link signal transmitter simulated members adopts binary offset carrier BOC and binary phase shift keying BPSK modulation system, after base-band information data, pseudo random sequence and square wave subcarrier are carried out spread spectrum, is modulated on main carrier.Wherein, BOC baseband signal is multiplied with square wave subcarrier by pseudo noise code, data-signal and is obtained.Pseudo noise code speed and subcarrier data rate follow certain principle, and the two speed is certain proportionate relationship.The time-domain expression of described BOC baseband signal is $S_{\mathrm{BOC}}\left(t\right)=e^{-\mathrm{i\θ}}\underset{k}{\mathrm{\Σ}}{a}_k{C}_{T_s}(t-\mathrm{\Δt})u_{{\mathrm{nT}}_s}(t-{\mathrm{knT}}_s-\mathrm{\Δt}),$ A in formula _kthe data-signal after pseudo-code modulation, value+1 or-1, for the cycle is 2T _ssquare wave subcarrier function, the spread symbol of to be shape be rectangular pulse, its duration is nT _s, k is spread symbol a kth symbol, θ is the phase place of signal, and Δ t is time migration, n be spread-spectrum signal cycle and subcarrier cycle 1/2nd between proportionate relationship, the number of subcarrier one half period namely comprised within a spread-spectrum signal cycle;

Binary phase shift keying (BPSK) modulation technique is a kind of digital signal modulation mode utilizing the phase place change of carrier wave to carry out transmitting digital information, and its amplitude and frequency remain unchanged.In BPSK, usually represent " 0 " and " 1 " in binary system respectively with initial phase 0 and π.BPSK modulation signal can be regarded carrier wave as and be multiplied with transmission data waveform, and data waveform is at each T _b=1/R _bvalue+1 or-1, wherein R in time _bfor data rate.BOC baseband signal is carried out BPSK modulation to obtain DS Data-Link signal expression and be in formula, P is signal power, s _bOCt () is BOC baseband signal, w _cfor the angular frequency of carrier signal, for the initial phase of carrier signal.

The carrier frequency of frequency-hopped data chain signal control by pseudo noise code and by the change of pseudo noise code constantly, saltus step randomly.Usually, in a symbol period, Frequency Hopping Signal can occupy one or more frequency gap, and frequency gap is controlled by pseudo random sequence.Therefore, frequency hopping is exactly produce different carrier frequencies with the information control frequency synthesizer that transmitting terminal produces, and obtains different radiofrequency signals by modulation.

The local oscillation signal that described frequency-hopped data chain signal transmitter simulated members produces is wherein A is signal amplitude, f _kfor a certain frequency in Hopping frequencies table, f _tIFfor transmitting intermediate frequency, g _tcfor gate function, for impulse function string, N is the number parameter of impulse function string, T _cfor sampling period parameter, for carrier phase;

Signal after ovennodulation is: wherein d (t) is information data, and Δ f is maximum frequency deviation, for carrier phase;

Thus the Frequency Hopping Signal that frequency-hopped data chain signal transmitter simulated members produces is: $S_{\mathrm{FH}}\left(t\right)=A\underset{k=1}{\overset{N}{\mathrm{\Σ}}}\cos (2\mathrm{\π}(f_k+d\left(t\right)\mathrm{\Δf})t+{\mathrm{\φ}}_k)g_{\mathrm{Tc}}(t-{\mathrm{kT}}_c)*\underset{m=-\∞}{\overset{\∞}{\mathrm{\Σ}}}\mathrm{\δ}(t-m{\mathrm{NT}}_c),$ In formula for carrier frequency f _kcorresponding carrier phase.

The basic transmission loss L of Data-Link signal in channel propagation paths _bfor: L _b=L _bf+ Y _p(dB), wherein L _bffor Propagation in free space, Y _pfor excess system loss; Propagation in free space is owing to propagating away from launch point gradually, caused by energy spreads in space, its computing formula is L _bf=32.45+20lgf+20lgr, in formula, f is signal frequency, and r is the actual propagation path (km) of electric wave through ionospheric reflection.Described excess system loss refers to except free-space loss, the loss caused because of other reason.Excess system loss is not a stable parameter, and its numerical value and geomagnetic latitude, season, local zone time, path length etc. have relation.Its loss value of accurate calculating is very difficult, in engineering calculation, usually estimate with the statistical value through repeatedly checking, and list checks in.

Preferably, described DS Data-Link receiver simulated members is to the DS Data-Link signal of input synchronously process, need first produce two-way local oscillation signal, namely wherein w _cfor the angular frequency of carrier signal, for the phase place of local frequency;

The output of I, Q two-way multiplier is respectively:

Wherein, the i.e. absolute value of Received signal strength and local oscillation signal phase difference;

After low pass filter, high fdrequency component by filtering, only surplus low frequency component, that is:

wherein G is storage gain device;

Phase demodulation error

When when being less than setting threshold, I road outputting data signals, namely q road output phase error information, namely

In frequency-hopped data chain receiver simulated members when the frequency of the local frequency synthesizer of frequency-hopped data receiver is consistent with the frequency hopping of the frequency-hopped data chain signal received, if the frequency-hopped data chain signal after automatic growth control and filtering process received is: wherein D (t) is transmit information data, and f is the carrier frequency of Received signal strength, for incoming carrier phase place;

The mixed frequency signal that frequency-hopped data chain receiver produces is: wherein Δ f is local intermediate frequency, for the initial phase of mixed frequency signal;

Export after mixing and be:

Again after bandpass filtering, exporting intermediate-freuqncy signal is:

After relevant to the output of local code Cyclic Correlator for the intermediate-freuqncy signal of output, result is:

$\begin{array}{c}z\left(t\right)=\mathrm{IFFT}\left[Z\left(t\right)\right]\\ =\mathrm{IFFT}\left[{\mathrm{FFT}}^{*}\right[s_{\mathrm{\Δf}}\left(t\right)]*\mathrm{FFT}[Y\left(t\right)\left]\right]\end{array},$ Wherein for local code maker exports;

By threshold judgement device, z (t) is adjudicated, when the maximum of output z (t) of code Cyclic Correlator and the ratio of mean value exceed threshold value, then system enters tracking phase, otherwise, continue the phase shift by search controller, local frequency hop sequences being carried out to 1/2 frequency gap, then catch.

The operation of the Systematical control management whole federation of member management, its work comprises:

(1) federation is created

Federation be for federal member between a mutual and virtual environment creating.Before federal establishment, each federal member may establish the object building test entity, but not mutual between the object of each federal member, and these objects are all registered less than in federation.Create federation and namely create federal emulation thread, and realize in thread:

1. the federal title of initialization, testing time and federal member title;

2. interoperability service between federal member is set, messaging sequences is set to reception order, time-constrain type is set to not only time controling but also the limited time;

3. set up circulation, in the unrevoked situation of federation, judge whether test suspends or terminate, and the system that realizes is pushed ahead in a stepwise manner, controls and shows the current testing time;

(2) run

After all simulated members add federation, bring into operation, each simulated members participates in federal mutual according to model, complete test function;

(3) test is suspended

In system operation, for a certain reason, needs are temporarily out of service.After pause command triggers, Systematical control management member sends a mutual example to each simulated members, controls each simulated members and suspends, and arrange state parameter;

(4) test is stopped

After having tested, stop test, Systematical control management member sends a mutual example to each simulated members, stops current all test activities, and each simulated members state instruction is set to initial condition, does not namely add federal state;

(5) federation is cancelled

After test run stops, federation still exists, and need cancel federation.The example that federation cancels rear each federal member is destroyed, and environment mutual between federal member has not existed.Systematical control management member jumps out circulation, destroys test thread.

For each federal member in federation, the service of RTI to each simulated members of federation is similar, therefore, a general federal main thread can be developed come, the basic process that RTI performs service is encapsulated, realize the testing process of each federal member, greatly can improve federal development efficiency like this.In system, federal main thread flow process is:

Step S1: initialization member data

(1) RTIambassador object rtiAmb is created

(2) FederateAmbassador object fedAmb is created

(3) tested object of initialization member

Step S2: call rti.creatFederationExecution () and create federation execution

Step S3: add federation execution

(1) call rtiAmb.joinFederationExecution () and add federation execution

(2) if add exception, then quit a program

Step S4: statement announcement/order relations

(1) RTI::AttributeHandleSetFactory::create () is called for each object class establishment handle collection

Call rtiAmb.getObjectClassHandle () and obtain object class handle value

Call rtiAmb.getAttributeHandle () and obtain object class attribute handle value

(2) rtiAmb.publishObjectClass () published object class is called

Call rtiAmb.subscribeObjectClassAttribute () and order object class

(3) call rtiAmb.getInteractionClassHandle () and obtain interactive class handle value

Call rtiAmb.gerParameterHandle () and obtain interaction parameter handle value

(4) call rtiAmb.publishInteractinClass () and announce interactive class

Call rtiAmb.subscribeInteractionClass () and order interactive class

Step S5: the time stepping method strategy (under default situations for neither " time controling " also non-" the limited time ") determining federal member

(1) call rtiAmb.enableTimeConstrained () and state that time stepping method strategy is the limited time (Constrained)

(2) call rtiAmb.enableTimeRegulation () and state that time stepping method strategy is time controling (Regulation)

Step S6: call rtiAmb.registerObjectInstance () registry object example

Step S7: call rtiAmb.timeAdvanceRequest () request time and advance

Step S8: give RTI by control, process call back function

(1) is advanced to run the model of federal member

(2) upgating object instance properties value

Call RTI::AttributeSetFactory::create () to create

RTI::AttributeHandleValuePairSet

Call rtiAmb.updateAttributeValues and upgrade instance properties value

(3) mutual example is sent

Call RTI::ParameterSetFactory::create () to create

RTI::ParameterHandleValuePairSet

Call rtiAmb.sendInteraction and send mutual example

(4) establishment/deleting object example as required

(5) shift/receive example ownership as required

(6) announce/cancel announcement as required, order/order cancellation object class/interactive class

(7) the time stepping method strategy of federal member is changed as required

Step S9: judge whether to meet time stepping method license, if do not met, then continues to perform step S8, if met, then performs step S10

Step S10: test advances

Step S11: judge to advance and whether terminate, if do not terminated, then continues to perform step S7, if terminated, then performs step S12

Step S12: call rtiAmb.resignFederationExecution () and exit federation execution

Step S13: call rtiAmb.destoryFederationExccution () and cancel federation execution.

Compared with prior art, the technical scheme that the application provides, the technique effect had or advantage are: native system can realize the test process of totally digitilized distributed data chain communication system in a LAN, Systematical control management member adopts federation management pattern, guarantees the true(-)running of test macro.Native system adopts HLA-RTI technology to realize the synchronous communication of each member with mutual, and then ensures that system components is coordinated, orderly function.

Accompanying drawing explanation

Fig. 1 is the Federation figure of Data-Link communication test system of the present invention;

Fig. 2 is Data-Link communication test system member topological diagram of the present invention;

Fig. 3 is federal main thread flow chart of the present invention;

Fig. 4 is the communication flow diagram of Data-Link communication test system of the present invention.

Embodiment

The embodiment of the present application is by providing a kind of distributed data chain communication test system towards spread spectrum system, HLA-RTI technology is adopted to realize synchronous communication between each member with mutual, ensure that system components harmonious orderly runs, thus establish stable, extendible Data-Link communication test system, realize the emulation testing to Data-Link communication system signal transmitter, channel, receiver, to solve the correctness of existing data link communications system processing procedure and the ageing technical problem that cannot reach test request.

In order to better understand technique scheme, below in conjunction with Figure of description and concrete execution mode, technique scheme is described in detail.

Embodiment

A kind of distributed data chain communication test system towards spread spectrum system is made up of hardware and software two parts, and hardware components comprises 5 computers and a station server, for software member provides operation hardware running environment.Software section, comprise DS Data-Link signal transmitter simulated members 10, frequency-hopped data chain signal transmitter simulated members 20, channel simulator member 30, DS Data-Link receiver simulated members 40, frequency-hopped data chain receiver simulated members 50 and Systematical control management member 60, be illustrated in figure 1 the Federation figure for Data-Link communication test system of the present invention, Figure 2 shows that data link communications system member topological diagram of the present invention.Wherein:

Described DS Data-Link signal transmitter simulated members 10, according to parameters such as transmission data, carrier frequency, modulation system, pseudo random sequence producing method, DS processing mode and pseudo-bit rates, emulation produces DS Data-Link signal;

Described frequency-hopped data chain signal transmitter simulated members 20, produces frequency-hopped data chain signal according to parameters simulations such as transmission data, pseudo random sequence producing method, DS processing mode, frequency hop sequences producing method, Hopping frequencies, modulation system, Frequency Hopping Signal residence times;

Described channel simulator member 30, comprise by DS Data-Link signal transmitter simulated members 10 to DS Data-Link signal receiver simulated members 40 with by two signal channels of frequency-hopped data chain transmitter simulated members 20 to frequency-hopped data chain receiver simulated members 50, for decaying to DS Data-Link signal and frequency-hopped data chain signal, add process of making an uproar;

Described DS Data-Link receiver simulated members 40, for carrying out reception process emulation to the DS Data-Link signal after the process of channel simulated members, realizes the crucial process such as the DS synchronization acquistion to DS Data-Link signal, DS synchronized tracking and demodulation;

Described frequency-hopped data chain receiver simulated members 50, for carrying out reception process emulation to the frequency-hopped data chain signal after the process of channel simulated members, realizes catching the frequency-hopping synchronization of frequency-hopped data chain signal, frequency-hopping synchronization trackings, demodulation etc. is crucial processes;

Described Systematical control management member 60 adopts federation management pattern, is responsible for the operation of whole federation, sending controling instruction completion status is mutual.It manages the operation of whole federation, comprise create federal, cancel federation, start test, suspend test, continue test and display testing time etc.

Below DS Data-Link signal transmitter simulated members 10, frequency-hopped data chain signal transmitter simulated members 20, channel simulator member 30, expansion Data-Link signal receiver simulated members 40, frequency-hopped data receiver chain signal simulated members 50 and Systematical control management member 60 are described further.

One, DS Data-Link signal transmitter simulated members

DS Data-Link signal transmitter simulated members adopts binary offset carrier BOC and binary phase shift keying BPSK modulation system, after base-band information data, pseudo random sequence and square wave subcarrier are carried out spread spectrum, is modulated on main carrier.Wherein, BOC baseband signal is multiplied with square wave subcarrier by pseudo noise code, data-signal and is obtained.Pseudo noise code speed and subcarrier data rate follow certain principle, and the two speed is certain proportionate relationship.The time-domain expression of described BOC baseband signal is $S_{\mathrm{BOC}}\left(t\right)=e^{-\mathrm{i\θ}}\underset{k}{\mathrm{\Σ}}{a}_k{C}_{T_s}(t-\mathrm{\Δt})u_{{\mathrm{nT}}_s}(t-{\mathrm{knT}}_s-\mathrm{\Δt}),$ A in formula _kthe data-signal after pseudo-code modulation, value+1 or-1, for the cycle is 2T _ssquare wave subcarrier function, the spread symbol of to be shape be rectangular pulse, its duration is nT _s, k is spread symbol a kth symbol, θ is the phase place of signal, and Δ t is time migration, n be spread-spectrum signal cycle and subcarrier cycle 1/2nd between proportionate relationship, the number of subcarrier one half period namely comprised within a spread-spectrum signal cycle;

Binary phase shift keying (BPSK) modulation technique is a kind of digital signal modulation mode utilizing the phase place change of carrier wave to carry out transmitting digital information, and its amplitude and frequency remain unchanged.In BPSK, usually represent " 0 " and " 1 " in binary system respectively with initial phase 0 and π.BPSK modulation signal can be regarded carrier wave as and be multiplied with transmission data waveform, and data waveform is at each T _b=1/R _bvalue+1 or-1, wherein R in time _bfor data rate.BOC baseband signal is carried out BPSK modulation to obtain DS Data-Link signal expression and be in formula, P is signal power, s _bOCt () is BOC baseband signal, w _cfor the angular frequency of carrier signal, for the initial phase of carrier signal.

The carrier frequency of frequency-hopped data chain signal control by pseudo noise code and by the change of pseudo noise code constantly, saltus step randomly.Usually, in a symbol period, Frequency Hopping Signal can occupy one or more frequency gap, and frequency gap is controlled by pseudo random sequence.Therefore, frequency hopping is exactly produce different carrier frequencies with the information control frequency synthesizer that transmitting terminal produces, and obtains different radiofrequency signals by modulation.

Two, frequency-hopped data chain signal transmitter simulated members

The local oscillation signal that frequency-hopped data chain signal transmitter simulated members produces is wherein A is signal amplitude, f _kfor a certain frequency in Hopping frequencies table, f _tIFfor transmitting intermediate frequency, g _tcfor gate function, for impulse function string, N is the number parameter of impulse function string, T _cfor sampling period parameter, for carrier phase;

Signal after ovennodulation is: wherein d (t) is information data, and Δ f is maximum frequency deviation, for carrier phase;

Thus the Frequency Hopping Signal that frequency-hopped data chain signal transmitter simulated members produces is: $S_{\mathrm{FH}}\left(t\right)=A\underset{k=1}{\overset{N}{\mathrm{\Σ}}}\cos (2\mathrm{\π}(f_k+d\left(t\right)\mathrm{\Δf})t+{\mathrm{\φ}}_k)g_{\mathrm{Tc}}(t-{\mathrm{kT}}_c)*\underset{m=-\∞}{\overset{\∞}{\mathrm{\Σ}}}\mathrm{\δ}(t-m{\mathrm{NT}}_c),$ In formula for carrier frequency f _kcorresponding carrier phase.

Three, channel simulator member

The basic transmission loss L of Data-Link signal in channel propagation paths _bfor: L _b=L _bf+ Y _p(dB), wherein L _bffor Propagation in free space, Y _pfor excess system loss;

Propagation in free space is owing to propagating away from launch point gradually, caused by energy spreads in space, its computing formula is L _bf=32.45+20lgf+20lgr, in formula, f is signal frequency, and r is the actual propagation path (km) of electric wave through ionospheric reflection.

Described excess system loss refers to except free-space loss, the loss caused because of other reason.Excess system loss is not a stable parameter, and its numerical value and geomagnetic latitude, season, local zone time, path length etc. have relation.Its loss value of accurate calculating is very difficult, in engineering calculation, usually estimate with the statistical value through repeatedly checking, and list checks in.

Four, DS Data-Link receiver simulated members

DS Data-Link receiver simulated members is to the DS Data-Link signal of input synchronously process, need first produce two-way local oscillation signal, namely wherein w _cfor the angular frequency of carrier signal, for the phase place of local frequency;

The output of I, Q two-way multiplier is respectively:

Wherein, the i.e. absolute value of Received signal strength and local oscillation signal phase difference;

After low pass filter, high fdrequency component by filtering, only surplus low frequency component, that is:

wherein G is storage gain device;

Phase demodulation error

When time less, namely when being less than setting threshold (setting threshold is 0.01) herein, I road outputting data signals, namely $I_{\mathrm{out}}\left(t\right)=\sqrt{2p}\·G\·s_{\mathrm{BOC}}\left(t\right),$ Q road output phase error information, namely

Five, frequency-hopped data chain receiver simulated members

When the frequency of the local frequency synthesizer of frequency-hopped data receiver is consistent with the frequency hopping of the frequency-hopped data chain signal received, if the frequency-hopped data chain signal after automatic growth control and filtering process received is: wherein D (t) is transmit information data, and f is the carrier frequency of Received signal strength, for incoming carrier phase place;

The mixed frequency signal that frequency-hopped data chain receiver produces is: wherein Δ f is local intermediate frequency, for the initial phase of mixed frequency signal;

Export after mixing and be:

Again after bandpass filtering, exporting intermediate-freuqncy signal is:

After relevant to the output of local code Cyclic Correlator for the intermediate-freuqncy signal of output, result is:

$\begin{array}{c}z\left(t\right)=\mathrm{IFFT}\left[Z\left(t\right)\right]\\ =\mathrm{IFFT}\left[{\mathrm{FFT}}^{*}\right[s_{\mathrm{\Δf}}\left(t\right)]*\mathrm{FFT}[Y\left(t\right)\left]\right]\end{array},$ Wherein for local code maker exports;

By threshold judgement device, z (t) is adjudicated, when the maximum of output z (t) of code Cyclic Correlator and the ratio of mean value exceed threshold value, then system enters tracking phase, otherwise, continue the phase shift by search controller, local frequency hop sequences being carried out to 1/2 frequency gap, then catch.

Six, Systematical control management member

The operation of the Systematical control management whole federation of member management, its work comprises:

(1) federation is created

Federation be for federal member between a mutual and virtual environment creating.Before federal establishment, each federal member may establish the object building test entity, but not mutual between the object of each federal member, and these objects are all registered less than in federation.Create federation and namely create federal emulation thread, and realize in thread:

1. the federal title of initialization, testing time and federal member title;

2. interoperability service between federal member is set, messaging sequences is set to reception order, time-constrain type is set to not only time controling but also the limited time;

3. set up circulation, in the unrevoked situation of federation, judge whether test suspends or terminate, and the system that realizes is pushed ahead in a stepwise manner, controls and shows the current testing time;

(2) run

After all simulated members add federation, bring into operation, each simulated members participates in federal mutual according to model, complete test function;

(3) test is suspended

In system operation, for a certain reason, needs are temporarily out of service.After pause command triggers, Systematical control management member sends a mutual example to each simulated members, controls each simulated members and suspends, and arrange state parameter;

(4) test is stopped

After having tested, stop test, Systematical control management member sends a mutual example to each simulated members, stops current all test activities, and each simulated members state instruction is set to initial condition, does not namely add federal state;

(5) federation is cancelled

After test run stops, federation still exists, and need cancel federation.The example that federation cancels rear each federal member is destroyed, and environment mutual between federal member has not existed.Systematical control management member jumps out circulation, destroys test thread.

Distributed data chain communication test system is a system be made up of multiple simulated members.In test process, the necessary co-ordination of each object member, completes test demonstration and verification jointly.Each object member is distributed on each physical node, for guaranteeing the validity of each node work, consistency and ageing, effective distribution control software must be adopted realize, the present invention adopts distributed simulation technology tall framed tube and federal run time infrastructure RTI thereof to solve distributed management and control problem, with systematic difference environment and structure for target, set up rational test platform.Below HLA/RTI running environment and key technology thereof are described further.

1, federated-object model

The main purpose of the federated-object model of HLA to be to provide between federal member by public, that standardized form carries out exchanges data specification, it is described that will to participate in the characteristic of the object class of federal member information exchange, object class attribute, interactive class, interactive class parameter in simulation run process.According to HLA regulation and stipulation, system employing Object model template OMT describes each member in federal and federation, and federation needs various data and the relevant information of exchange in running, wherein mainly comprises object class structural table, attribute list, interactive class structural table, parameter list and enumerated data type table.

(1) interactive class structural table

Interactive class refers to abstract to the clear and definite action that other members have an impact that the object of a member produces.Each object of interactive class is called the example of this interactive class.Towards in the distributed data chain communication test system of spread spectrum system, the interactive class taken out is as follows:

Control command class (Sim_Controller): such control achieving federal member is mutual.Member's running status class (Member_State): it is mutual that such achieves federal member state.Table 1 have recorded the interactive class of system.

Table 1 interactive class structural table

(2) parameter list

Parameter list provides dare to the information of all interactive class parameters in federation.Towards in the distributed data chain communication test system of spread spectrum system, the interactive class parameter taken out is as follows:

Control command class: control command.Member's running status class: member number, member condition.Table 2 have recorded the parameter of the interactive class of system.

Table 2 interactive class parameter list

2, the state of federation execution controls

The federation execution status management service that HLA provides, achieves the establishment of federation execution, cancels and the adding of federal member, to exit.But towards in the distributed data chain communication test system of spread spectrum system, also need to realize the beginning of federation execution, time-out, continuation, terminate and to exit etc. the control of state, therefore, the service directly utilizing the federation management of HLA to provide cannot realize.In order to solve multiposition control problem, enumeration type variable being set at control end (i.e. federal control member), for each federal state arranges an enumerated value, and utilizing the announcement mechanism of interactive class in HLA, issuing control information.And the order mechanism of interactive class in HLA is used at controlled end (i.e. federal member), obtain control information, and in conjunction with many Boolean variables control technology, determine self slave mode.Many Boolean variables control technology arranges multiple Boolean variable at controlled end, according to enumerating control information, changing corresponding Boolean variable value, determining the state of controlled end self.Enumeration type and enumerated value as shown in table 3.

Table 3 state controls enumeration type

After controlled end orders control information, utilize in main thread simulation.cpp, call call back function Member_State::addCallback (& exConn, Member_StateCallback, NULL) state controls mutual call back function, arranges the value of corresponding Boolean variable.In multiple Boolean variable and as shown in table 4 with the relation of enumerated value that controlled end is arranged.

Table 4 state Boolean variable table

Controlled end obtains and enumerates control information, and after arranging corresponding Boolean variable value, controlled end system main thread, by judging the value of each Boolean variable, determines the state of self.

3, federal time management mechanism

In HLA, the how propelling in control time when federation execution that what federal time management was paid close attention to is.Federal time management, by coordinating the Message Transmission of band time stamp (testing time of federal member), realizes the propelling of testing time.Federal time management mechanism comprises two aspects: message passing mechanism and Time Advance Mechanism.

(1) message passing mechanism of federal member

Message is a very important concept on HLA system, and RTI coordinates the operation of integrin nation by message.The mode of HLA time management service coordinated time is undertaken by mutually sending message.Towards in the distributed data chain communication test system of spread spectrum system, for ensureing the real time communication between each member, test macro must carry out high-speed transfer, system to the requirement of message transmission speed higher than to causal requirement, consider that in analogue system, all members are this features of limited member simultaneously, determine that the messaging sequences of all members in this test macro is all reception order.

(2) Time Advance Mechanism of federal member

Process the timeslice length that 0.2ms is each process receiving simulated members in the distributed data chain communication test system of spread spectrum system, be the fixed value of setting at every turn inside this system.Data-Link signal data, and synchronization acquistion process being carried out to the Data-Link signal produced, in order to ensure the correctness of logic and sequential, adopting the Time Advance Mechanism of stepping.In addition, Data-Link signal data can also divide multistep to produce by the Time Advance Mechanism of stepping, and each step produces shorter data.So both shorten Data-Link signal generation time, turn avoid other simulated members and waste system resource because waiting as long for.

In RTI, the progradation based on the federal time of step-length comprises three steps: first, and federal member calls time management service TimeAdvanceRequest () request logical time and advances.Then, if meet time stepping method condition, RTI meets the message of transmission condition to federal member distribution current time in message queue.Finally, RTI, by calling federal member TimeAdvanceRequest () call back function, represents that the logical time of this federal member is own through advancing.

4, data transfer mode

The data designing transmission in the distributed data chain communication test system of spread spectrum system mainly comprise two classes: a class is that test macro normally runs necessary interactive class, and the data usually only containing one or several value type are small-sized data.The another kind of signal data being mainly used for Data-Link signal and producing and send, the amount of this kind of data is larger.When the timeslice size choosing Data-Link signal is 0.2ms, to produce and the size of the Data-Link signal data transmitted all exceedes the space shared by data of up to ten thousand floating point types, therefore, be large data at every turn.

Distributed data chain communication test system towards spread spectrum system mainly contains two kinds for the mode of transfer of data between federal member: a kind of is announcement based on HLA and the transfer of data ordered mechanism and realize; Another kind transmits based on the socket (socket) of windows platform.

For the wire data type of Data-Link signal, according to its feature, determine their data transfer mode: for the transmission of this small-sized data of interactive class, adopt and realize based on the announcement of HLA and the mechanism of order, reduce Internet traffic, save the processor time.For the transmission of Data-Link signal data, due to larger towards Data-Link signal data in the distributed data chain communication test system of spread spectrum system, the floating-point quantity transmitted each time all more than 10,000, and for ensureing the correctness of Data-Link signal data transmission, must carry out transmitting.Therefore, the data transfer mode based on TCP is adopted to realize the transmission of Data-Link signal data.

5, integrated and test is federal

For each federal member in federation, the service of RTI to each simulated members of federation is similar, therefore, a general federal main thread can be developed come, the basic process that RTI performs service is encapsulated, realize the testing process of each federal member, greatly can improve federal development efficiency like this.In system, federal main thread flow process as shown in Figure 3.

Step S1: initialization member data

(1) RTIambassador object rtiAmb is created

(2) FederateAmbassador object fedAmb is created

(3) tested object of initialization member

Step S2: call rti.creatFederationExecution () and create federation execution

Step S3: add federation execution

(1) call rtiAmb.joinFederationExecution () and add federation execution

(2) if add exception, then quit a program

Step S4: statement announcement/order relations

(1) RTI::AttributeHandleSetFactory::create () is called for each object class establishment handle collection

Call rtiAmb.getObjectClassHandle () and obtain object class handle value

Call rtiAmb.getAttributeHandle () and obtain object class attribute handle value

(2) rtiAmb.publishObjectClass () published object class is called

Call rtiAmb.subscribeObjectClassAttribute () and order object class

(3) call rtiAmb.getInteractionClassHandle () and obtain interactive class handle value

Call rtiAmb.gerParameterHandle () and obtain interaction parameter handle value

(4) call rtiAmb.publishInteractinClass () and announce interactive class

Call rtiAmb.subscribeInteractionClass () and order interactive class

Step S5: the time stepping method strategy (under default situations for neither " time controling " also non-" the limited time ") determining federal member

(1) call rtiAmb.enableTimeConstrained () and state that time stepping method strategy is the limited time (Constrained)

(2) call rtiAmb.enableTimeRegulation () and state that time stepping method strategy is time controling (Regulation)

Step S6: call rtiAmb.registerObjectInstance () registry object example

Step S7: call rtiAmb.timeAdvanceRequest () request time and advance

Step S8: give RTI by control, process call back function

(1) is advanced to run the model of federal member

(2) upgating object instance properties value

Call RTI::AttributeSetFactory::create () to create

RTI::AttributeHandleValuePairSet

Call rtiAmb.updateAttributeValues and upgrade instance properties value

(3) mutual example is sent

Call RTI::ParameterSetFactory::create () to create

RTI::ParameterHandleValuePairSet

Call rtiAmb.sendInteraction and send mutual example

(4) establishment/deleting object example as required

(5) shift/receive example ownership as required

(6) announce/cancel announcement as required, order/order cancellation object class/interactive class

(7) the time stepping method strategy of federal member is changed as required

Step S9: judge whether to meet time stepping method license, if do not met, then continues to perform step S8, if met, then performs step S10

Step S10: test advances

Step S11: judge to advance and whether terminate, if do not terminated, then continues to perform step S7, if terminated, then performs step S12

Step S12: call rtiAmb.resignFederationExecution () and exit federation execution

Step S13: call rtiAmb.destoryFederationExccution () and cancel federation execution.

Figure 4 shows that the communication flow diagram of Data-Link communication test system, its communication process is:

Step 1: read information data code;

Step 2: read redundant data code;

Step 3: information code is encoded;

Step 4: judge whether to adopt DS Data-Link, if so, then carry out the emulation of DS Data-Link signal, perform step 401, if not, then hold the emulation carrying out frequency-hopped data chain signal, perform step 404;

Step 401: produce DS Data-Link signal;

Step 402: transmission;

Step 403: DS Data-Link signal synchronously receives;

Step 404: produce DS Data-Link signal;

Step 405: transmission;

Step 406: DS Data-Link signal synchronously receives;

Step 5: export data.

Compared with prior art, the technical scheme that the application provides, the technique effect had or advantage are: native system can realize the test process of totally digitilized distributed data chain communication system in a LAN, Systematical control management member adopts federation management pattern, guarantees the true(-)running of test macro.Native system adopts HLA-RTI technology to realize the synchronous communication of each member with mutual, and then ensures that system components is coordinated, orderly function.

In above-described embodiment of the application, by providing a kind of distributed data chain communication test system towards spread spectrum system, HLA-RTI technology is adopted to realize synchronous communication between each member with mutual, ensure that system components harmonious orderly runs, thus establish stable, extendible Data-Link communication test system, realize the emulation testing to Data-Link communication system signal transmitter, channel, receiver, to solve the correctness of existing data link communications system processing procedure and the ageing technical problem that cannot reach test request.

It should be noted that; above-mentioned explanation is not limitation of the present invention; the present invention is also not limited in above-mentioned citing, the change that those skilled in the art make in essential scope of the present invention, modification, interpolation or replacement, also should belong to protection scope of the present invention.

Claims (8)

1. the distributed data chain communication test system towards spread spectrum system, it is characterized in that, described system comprises DS Data-Link signal transmitter simulated members, frequency-hopped data chain signal transmitter simulated members, channel simulator member, DS Data-Link receiver simulated members, frequency-hopped data chain receiver simulated members and Systematical control management member, wherein:

Described DS Data-Link signal transmitter simulated members, emulation produces DS Data-Link signal;

Described frequency-hopped data chain signal transmitter simulated members, emulation produces frequency-hopped data chain signal;

Described channel simulator member, comprise by DS Data-Link signal transmitter simulated members to DS Data-Link signal receiver simulated members with by two signal channels of frequency-hopped data chain transmitter simulated members to frequency-hopped data chain receiver simulated members, for decaying to DS Data-Link signal and frequency-hopped data chain signal, add process of making an uproar;

Described DS Data-Link receiver simulated members, for carrying out reception process emulation to the DS Data-Link signal after the process of channel simulated members;

Described frequency-hopped data chain receiver simulated members, for carrying out reception process emulation to the frequency-hopped data chain signal after the process of channel simulated members;

Described Systematical control management member adopts federation management pattern, is responsible for the operation of whole federation, sending controling instruction completion status is mutual.

2. the distributed data chain communication test system towards spread spectrum system according to claim 1, it is characterized in that, described DS Data-Link signal transmitter simulated members adopts binary offset carrier BOC and binary phase shift keying BPSK modulation system, after base-band information data, pseudo random sequence and square wave subcarrier are carried out spread spectrum, be modulated on main carrier; Wherein,

The time-domain expression of described BOC baseband signal is

$S_{\mathrm{BOC}}\left(t\right)=e^{-\mathrm{i\θ}}\underset{k}{\mathrm{\Σ}}{a}_k{C}_{T_s}(t-\mathrm{\Δt})u_{n{T}_s}(t-\mathrm{kn}{T}_s-\mathrm{\Δt}),$ A in formula _kthe data-signal after pseudo-code modulation, value+1 or-1, for the cycle is 2T _ssquare wave subcarrier function, the spread symbol of to be shape be rectangular pulse, its duration is nT _s, k is spread symbol a kth symbol, θ is the phase place of signal, and Δ t is time migration, n be spread-spectrum signal cycle and subcarrier cycle 1/2nd between proportionate relationship, the number of subcarrier one half period namely comprised within a spread-spectrum signal cycle;

BOC baseband signal is carried out BPSK modulation to obtain DS Data-Link signal expression and be

in formula, P is signal power, s _bOCt () is BOC baseband signal, w _cfor the angular frequency of carrier signal, for the initial phase of carrier signal.

3. the distributed data chain communication test system towards spread spectrum system according to claim 1, is characterized in that, the local oscillation signal that described frequency-hopped data chain signal transmitter simulated members produces is wherein A is signal amplitude, f _kfor a certain frequency in Hopping frequencies table, f _tIFfor transmitting intermediate frequency, g _tcfor gate function, for impulse function string, N is the number parameter of impulse function string, T _cfor sampling period parameter, for carrier phase;

Signal after ovennodulation is: wherein d (t) is information data, and Δ f is maximum frequency deviation, for carrier phase;

Thus the Frequency Hopping Signal that frequency-hopped data chain signal transmitter simulated members produces is:

$S_{\mathrm{FH}}\left(t\right)=A\underset{k=1}{\overset{N}{\mathrm{\Σ}}}\cos (2\mathrm{\π}(f_k+d\left(t\right)\mathrm{\Δf})t+{\mathrm{\φ}}_k)g_{\mathrm{Tc}}(t-k{T}_c)*\underset{m=-\∞}{\overset{\∞}{\mathrm{\Σ}}}\mathrm{\δ}(t-\mathrm{mN}{T}_c),$ In formula for carrier frequency f _kcorresponding carrier phase.

4. the distributed data chain communication test system towards spread spectrum system according to claim 1, is characterized in that, the basic transmission loss L of described Data-Link signal in channel propagation paths _bfor: L _b=L _bf+ Y _p(dB), wherein L _bffor Propagation in free space, Y _pfor excess system loss; Propagation in free space L _bf=32.45+20lgf+20lgr, in formula, f is signal frequency, and r is the actual propagation path (km) of electric wave through ionospheric reflection.

5. the distributed data chain communication test system towards spread spectrum system according to claim 2, is characterized in that, described DS Data-Link receiver simulated members is to the DS Data-Link signal of input synchronously process, need first produce two-way local oscillation signal, namely wherein w _cfor the angular frequency of carrier signal, for the phase place of local frequency;

The output of I, Q two-way multiplier is respectively:

Wherein, the i.e. absolute value of Received signal strength and local oscillation signal phase difference;

After low pass filter, high fdrequency component by filtering, only surplus low frequency component, that is:

wherein G is storage gain device;

Phase demodulation error

When when being less than threshold value, I road outputting data signals, namely q road output phase error information, namely

6. the distributed data chain communication test system towards spread spectrum system according to claim 3, it is characterized in that, in frequency-hopped data chain receiver simulated members when the frequency of the local frequency synthesizer of frequency-hopped data receiver is consistent with the frequency hopping of the frequency-hopped data chain signal received, if the frequency-hopped data chain signal after automatic growth control and filtering process received is: wherein D (t) is transmit information data, and f is the carrier frequency of Received signal strength, for incoming carrier phase place;

The mixed frequency signal that frequency-hopped data chain receiver produces is:

wherein Δ f is local intermediate frequency, for the initial phase of mixed frequency signal;

Export after mixing and be:

Again after bandpass filtering, exporting intermediate-freuqncy signal is:

After relevant to the output of local code Cyclic Correlator for the intermediate-freuqncy signal of output, result is:

$\begin{array}{c}z\left(t\right)=\mathrm{IFFT}\left[Z\left(t\right)\right]\\ =\mathrm{IFFT}\left[{\mathrm{FFT}}^{*}\right[s_{\mathrm{\Δf}}\left(t\right)]*\mathrm{FFT}[Y\left(t\right)\left]\right]\end{array},$ Wherein for local code maker exports;

By threshold judgement device, z (t) is adjudicated, when the maximum of output z (t) of code Cyclic Correlator and the ratio of mean value exceed threshold value, then system enters tracking phase, otherwise, continue the phase shift by search controller, local frequency hop sequences being carried out to 1/2 frequency gap, then catch.

7. the distributed data chain communication test system towards spread spectrum system according to claim 1, is characterized in that, the work of described Systematical control management member comprises:

(1) create federation, namely create federal emulation thread, and realize in thread:

1. the federal title of initialization, testing time and federal member title;

2. interoperability service between federal member is set, messaging sequences is set to reception order, time-constrain type is set to not only time controling but also the limited time;

3. set up circulation, in the unrevoked situation of federation, judge whether test suspends or terminate, and the system that realizes is pushed ahead in a stepwise manner, controls and shows the current testing time;

(2) run: after all simulated members add federation, bring into operation, each simulated members participates in federal mutual according to model, complete test function;

(3) suspend test: after pause command triggers, Systematical control management member sends a mutual example to each simulated members, controls each simulated members and suspends, and arrange state parameter;

(4) stop test: after having tested, stop test, Systematical control management member sends a mutual example to each simulated members, stops current all test activities, and each simulated members state instruction is set to initial condition;

(5) cancel federation: after cancelling federation, between federal member, interactive environment has not existed, and Systematical control management member jumps out circulation, destroys test thread.

8. the distributed data chain communication test system towards spread spectrum system according to claim 7, it is characterized in that, in described system, federal main thread flow process is:

Step S1: initialization member data;

Step S2: create federation execution;

Step S3: add federation execution;

Step S4: statement announcement/order relations;

Step S5: the time stepping method strategy determining member;

Step S6: registry object example;

Step S7: request time advances;

Step S8: give RTI by control, process call back function;

Step S9: judge whether to meet time stepping method license, if can not meet, then continues to perform step S8, if met, then performs step S10;

Step S10: test advances;

Step S11: judge whether test terminates, as do not terminated, then continues to perform step S7, if terminated, then performs step S12;

Step S12: exit federation;

Step S13: cancel federation.