CN100546262C - A kind of broadband aviation electronic bus testing apparatus and method of operation thereof - Google Patents

A kind of broadband aviation electronic bus testing apparatus and method of operation thereof Download PDF

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Publication number
CN100546262C
CN100546262C CNB2007101182952A CN200710118295A CN100546262C CN 100546262 C CN100546262 C CN 100546262C CN B2007101182952 A CNB2007101182952 A CN B2007101182952A CN 200710118295 A CN200710118295 A CN 200710118295A CN 100546262 C CN100546262 C CN 100546262C
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unit
message
test
bus
interface
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CN101079757A (en
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周强
熊华钢
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Beihang University
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Beihang University
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Abstract

A kind of broadband aviation electronic bus testing apparatus of the present invention and method of operation thereof, this device comprises: main computer unit, bus test interface unit, media units; Wherein, main computer unit connects with the bus test interface unit, and the bus test interface unit connects with media units, and unit under test connects with media units; This bus test interface unit injects the unit by host interface unit, agreement control unit, station administration unit, fault and the Media Interface Connector unit is formed; The method of operation of this device is: after the system power-up, program will be moved automatically, select different test patterns by mouse: (1) frame format operator scheme; (2) station administration operator scheme; (3) the line loop pattern of multi-site; (4) the message scheduling method of multipriority; (5) mode state transitions pattern; (6) node key state parameter mode.This testing apparatus testing cost is low, and method of operation is simple, and man-machine interface is friendly and repeatable strong.

Description

A kind of broadband aviation electronic bus testing apparatus and method of operation thereof
(1) technical field:
The present invention relates to test to a kind of broadband aviation electronic bus, for this bus system provides an Evaluation Platform that detects its service behaviour, specifically, be meant a kind of broadband aviation electronic bus testing apparatus and method of operation thereof, belong to aviation electronic bus testing apparatus technical field.
(2) background technology:
Along with the development of avionics, the aviation electronic bus technology has experienced from discrete, association type, and even the generation of composite type is evolution.The broadband aviation electronic bus system is the informix system that is used for information exchange and resource-sharing between each subsystem of aviation electronics, be vital in the avionics system " nervous centralis ", broadband aviation electronic bus belongs to composite type, compare with in the past discrete, association type aviation electronic bus technology, have higher throughput, the time-delay of lower message and high reliability more.Therefore, how to adopt reasonable method that the key property and the function of broadband aviation electronic bus system are carried out testing authentication, realize having the important use meaning with the task of guaranteeing avionics system and even whole aerocraft system.
Evaluation method to aviation electronic bus; Generally comprise mathematical analysis/Mathematical Modeling, Computer Simulation, semi physical hardware-in-the-loop simulation, set up real system and test.Wherein, test is a method the most accurately and effectively., traditional aviation electronic bus (as ARINC429, MIL-STD-1553B) all there is the test macro of corresponding test method and comparative maturity both at home and abroad, but because particularity (the high bandwidth 50Mbps of broadband aviation electronic bus system; Timed token message is transmitted; Priority assignment), make it be different from the content measurement and the method for testing of traditional bus system (point to point system of ARINC429, the commanded response formula mode of MIL-STD-1553B).In addition, the specificity of traditional test device makes in the past test macro and device can only be competent at the testing evaluation of specific bus, the key property and the functional assessment of not competent broadband aviation electronic bus (HSDB).
(3) summary of the invention:
The objective of the invention is at broadband aviation electronic bus particularity, a kind of broadband aviation electronic bus testing apparatus and method of operation thereof are provided, this apparatus system equipment is succinct, efficient, reliable, can satisfy the performance requirement of system simultaneously again, and is easy and simple to handle.
A kind of broadband aviation electronic bus testing apparatus of the present invention, it comprises: main computer unit, bus test interface unit, media units; Wherein, main computer unit connects with the bus test interface unit, and the bus test interface unit connects with media units, and unit under test connects with media units.
Wherein, this main computer unit can be handled the data from bus in real time, calculates to unpack application data, mode of operation is judged, and the switching of the pattern of finishing the work, demonstration, and realize mutual control between man-machine.
Wherein, this media units adopts optical fiber also can adopt cable, and transmission rate can reach 50Mbps.
Wherein, this bus test interface unit is made up of host interface unit, agreement control unit, station administration unit, fault injection unit and Media Interface Connector unit; Wherein, the same main computer unit of this host interface unit, agreement control unit, station administration unit, Media Interface Connector unit connect, this agreement control unit injects unit, the connection of Media Interface Connector unit with station administration unit, fault, and this Media Interface Connector unit connects with media units.
Wherein, this agreement control unit protocol processes parts that are the HSDB bus.Agreement adopts linear token to transmit the multiplex data bus agreement, has defined token message, application token message, station administration message, four kinds of type of messages of data-message.The agreement control unit is finished the explanation to the operation of agreement regulation, comprising: one, how to determine the current state of living in of agreement control unit, and finish the conversion between the various states; Two, control the behavior of each timer, and the timer behavior outcome is made explanations; Three, can detect the message that receives and send by mistake and flow register module, and the result who detects is carried out analyzing and processing, make that reception and transmission are correctly carried out; Four, by to command register and everybody explanation by turn of status register module, finish pattern control to whole bus test interface unit; Five, finish scheduling, the packing of message according to agreement, and the good message of will packing sends the Media Interface Connector unit to.
Wherein, this station administration unit is the maintenance mechanism of agreement proper operation, has loading between the HSDB network node, configuration, test, Network Management Function such as synchronous.The station administration cell processing is from the station administration message of other node on the HSDB network, and message comprises: pattern control command, loading/report configuration, loopback test message; If this node is the time main website, station administration unit periodically formation time synchronization message sends to other online node, if this node is the time slave station, the station administration unit will respond the time synchronized message from the time main website.
Wherein, it is the parts of realizing the fault excitation that this fault is injected the unit, has the errored bit function is injected in each territory of Frame.
Wherein, this host interface unit is the passage that connects main computer unit and bus test interface unit inside, and it finishes following function: host interface unit receives the initialization value from the order of main computer unit and inner each register of bus test interface unit.To receiving the matching destination address verification of message.By the double port memory shared data.
Wherein, this Media Interface Connector unit is made up of 3 submodules, (1) transmission interface module; (2) receiving interface module; (3) receiver module.This Media Interface Connector unit provides the connection between inner each several part of bus test interface unit and the media units, realizes Data Receiving and sending function.
The method of operation of a kind of broadband aviation electronic bus testing apparatus of the present invention is: after the system power-up, program will be moved automatically, at this moment, select different test patterns by mouse:
(1) frame format operator scheme, transmission/reception control command is injected by the human-computer interaction interface on the main frame by system, this order is issued to the agreement control unit through host interface unit, realize the operation to Frame in the agreement control unit, wherein Frame comprises following territory: starting delimiter, frame control, source address, destination address, word count, information, message frame verification sequence, token frame verification sequence and termination delimiter; When carrying out fault test, inject the unit by control fault and inject errored bit to each territory of outgoing data frame, data after the injection fault send to unit under test by Media Interface Connector unit, media units, receive corresponding responsive data frame from the unit under test winding then, analyze this Frame by mainframe program again, to reach the purpose of test frame form.
(2) station administration operator scheme, system is by the human-computer interaction interface input station bookkeeping control command on the main frame, this order is issued to the station administration unit through host interface unit, the setting operation of loading between in the station administration unit, realizing bus node, configuration, test, management by synchronization function, the station administration cell processing is from the station administration message of other node on the HSDB network, and message comprises: pattern control command, loading/report configuration, loopback test message; If this node is the time main website, station administration unit periodically formation time synchronization message sends to other online node, if this node is the time slave station, the station administration unit will respond the time synchronized message from the time main website.Under this pattern, the ability of main testing station administrative unit maintenance agreement proper operation.
(3) the line loop pattern of multi-site, system is by the input of the human-computer interaction interface on main frame line loop control command, this order is issued to the station administration unit through host interface unit, when system that unit under test is made up of a plurality of nodes, finish the foundation of token ring, the ring that moves back of going into ring and fault station of new website by the station administration unit.Under this pattern, mainly test the ability that the HSDB network is built ring, gone into to encircle and move back ring.
(4) the message scheduling method of multipriority, system is provided with message content, destination address, priority parameters by the human-computer interaction interface on the main frame, these supplemental characteristics are issued to the agreement control unit through host interface unit, the agreement control unit is by the behavior of each priority timer of control, finish scheduling, the packing of message according to agreement, and the good message of will packing sends the Media Interface Connector unit to.Under this pattern, main test protocol control unit is to the ability of the correct scheduled transmission of different priorities message.
(5) mode state transitions pattern, system is by the human-computer interaction interface input mode state transitions order on the main frame, this order is issued to the agreement control unit through host interface unit, determine current mode state of living in by the agreement control unit, and conversion between the various states is finished in order according to the mode state transitions.Under this pattern, main test protocol control unit is to the ability of the correct transfer between the mode state.
(6) node key state parameter mode, system is provided with loop node number, each node physical address, each timer initial value of node, master/slave state of a control of time or the like parameter by the human-computer interaction interface on the main frame, these supplemental characteristics are issued to the station administration unit through host interface unit, finish the setting of various parameters by the station administration unit, the human-computer interaction interface that the result after will being provided with simultaneously returns main frame shows.Under this pattern, main test synthesis reflection HSDB networking state status.
A kind of broadband aviation electronic bus testing apparatus of the present invention and method of operation thereof, its advantage and effect are: the use of (1) testing apparatus is not subjected to environmental limitations, reduces testing cost; (2) method of operation is simple, man-machine interface close friend; (3) repeatable strong.
(4) description of drawings:
Fig. 1 is a testing apparatus general principles block diagram of the present invention.
Fig. 2 is the theory diagram of bus test interface unit.
Fig. 3 is a host interface unit behavioral scaling theory diagram.
Fig. 4 is an agreement control unit behavioral scaling theory diagram.
Fig. 5 is a station administration unit behavioral scaling theory diagram.
Fig. 6 is a Media Interface Connector unit behavioral scaling theory diagram.
Fig. 7 is the theory diagram that the operator scheme of human-computer interaction interface is selected.
Fig. 8 is the theory diagram that the station administration location mode shifts.
Fig. 9 is the theory diagram of mode state transitions.
Number in the figure is described as follows:
1. 2. 3.4. 5. 6.21. 22. 23.24. 25. 26.261. 262. 27.29. 291. 292.211. 212. 213.214. 215. 216.217. 221.222. 223.224. 225.231. 232.233. 234.241. 242. 243.
(5) embodiment:
The present invention is described in further detail below in conjunction with accompanying drawing.
A kind of broadband aviation electronic bus testing apparatus of the present invention as shown in Figure 1, comprises main computer unit 1, bus test interface unit 2, media units 3; Wherein, main computer unit 1 connects with bus test interface unit 2, and bus test interface unit 2 connects with media units 3, and unit under test connects with media units 3; This bus test interface unit 2, comprise host interface unit 21, agreement control unit 22, station administration unit 23, fault injection unit 25 and Media Interface Connector unit 24, host interface unit 21 connects with main computer unit 1, agreement control unit 22, station administration unit 23, Media Interface Connector unit 24, agreement control unit 22 injects unit 25,24 connections of Media Interface Connector unit with station administration unit 23, fault, and Media Interface Connector unit 24 connects with media units 3.
Main computer unit 1 of the present invention can be handled the data from the host interface signal of telecommunication 4 in real time, calculates to unpack application data, mode of operation is judged, and the switching of the pattern of finishing the work, demonstration, and realize mutual control between man-machine.Main computer unit 1 adopts the industrial computer platform to realize.
Media units 3 of the present invention adopts optical fiber also can adopt cable, and transmission rate can reach 50Mbps.
Host interface unit 21 of the present invention is the passages that connect main computer unit 1 and bus test interface unit 2 inside, and it finishes following function: host interface unit 21 receives the initialization value from the order of main computer unit 1 and bus test interface unit 2 inner each registers.To receiving the matching destination address verification of message.By the double port memory shared data.
The behavioral scaling theory diagram of this host interface unit 21 is seen shown in Figure 3, is made up of seven submodules, and is existing as follows to each submodule function declaration: (1) command area module 211; (2) the sending area module 212; (3) the reception area module 213; (4) message filtering table module 214; (5) interruption controls district module 215; (6) local host bus control module 216; (7) the local bus control module 217.Command area module 211 receives from the instruction of main computer unit 1 and by " local subaddressing bus; local data's bus; local control bus and local check bus " four kinds of local bus signals by " main frame subaddressing bus; host data bus; host computer control bus and main frame check bus " four kinds of host interface signals of telecommunication 4 and is issued to local bus control module 217, and local bus control module 217 realizes sending or receiving function according to different command content (comprise and send and receive) control sending area module 212 or reception area module 213 then.The function of message filtering table module 214 is to be used to judge the logical address that receives data, with this as being reception or the foundation that abandons this message.If destination address does not match, this message will be dropped, if matching destination address, 213 continuation of reception area module unpack the message (comprising station administration message) from other website, put into the relevant position that receives buffering area under the control of the local bus control module 217 in host interface unit 21.Local host bus control module 216 is put into sending area module 212 by " local main frame subaddressing bus, local host data bus, local host computer control bus and local main frame check bus " four class station administration data-signals 27 with configuration report, status report, time report, time synchronized message, loopback test response message that station administration unit 23 sends to other website, and obtains sending under local host bus control module 216 controls.Required prioritization when interruption controls district module 215 can support above-mentioned functions to realize.
The protocol processes parts that agreement control unit 22 of the present invention is HSDB buses.Agreement adopts linear token to transmit the multiplex data bus agreement, has defined token message, application token message, station administration message, four kinds of type of messages of data-message.Agreement control unit 22 is finished the explanation to the operation of agreement regulation, comprising: one, how to determine the current state of living in of agreement control unit, and finish the conversion between the various states; Two, control the behavior of each timer, and the timer behavior outcome is made explanations; Three, can detect by mistake and 223 pairs of message that receive and send of flow register module, and the result who detects is carried out analyzing and processing, make that reception and transmission are correctly carried out; Four, by to everybody explanation by turn of command register and status register module 225, finish pattern control to whole bus test interface unit 2; Five, finish scheduling, the packing of message according to agreement, and the good message of will packing sends Media Interface Connector unit 24 to.
The behavioral scaling theory diagram of this agreement control unit 22 is seen shown in Figure 4, form by five submodules, now as follows to each submodule function declaration: (1) control module 221 is according to current pattern of living in, and various monitoring results and handshake determine various states, and whether apply for token, whether send token, whether send operation such as reset.In addition, because these operations will use partial check's bus, local data's bus, local control bus, local subaddressing bus that some registers are carried out read/write operation, so the function that these local buss are controlled will be arranged in the control module.(2) time register and timer module 222 receive and finish agreement predetermined timing device and clock simultaneous operation from the local clock signal of crystal oscillator 226.Local clock is through producing various clock signals behind the frequency division, these signals all adopt the edge to trigger, so that each timer is controlled.(3) one 16 a error register and a flow register (not shown) arranged in mistake and the flow register module 223.The implication of each of this error register is by protocol definition, these representatives receive and process of transmitting in most of mistake of being produced.For monitor signal from Media Interface Connector unit 24, this element is handled, and the result that will handle is divided into two kinds of situations: one, and error register is provided with, and can carries out read/write operation by partial check's bus, local data's bus, local control bus and local subaddressing bus; Two, represent the various holding wires of current state, and these holding wires are passed to control module 221.This flow register is finished the statistics to our station message traffic situation.(4) sender module 224 is finished the formation of token frame, application token frame, message frame and station administration frame, and formed frame is passed to Media Interface Connector unit 24.Process of transmitting will carry out read operation to register by bus.(5) command register and status register module 225 are finished everybody explanation of this command register according to agreement and are reflected in this status register.All to be undertaken these two operation registers by local bus.When command register being carried out write operation when changing current pattern of living in, to keep in the content of command register earlier, whether protocol compliant is stipulated to judge the order that is come then, promptly enters new model if meet, and puts the corresponding positions of command register according to present mode.Operation for bus status bit is also similar, also is earlier the content of command register to be kept in, and whether protocol compliant is stipulated to judge the order that is come then, promptly enters new state if meet, and according to the corresponding positions of current state configuration state register.
Station administration of the present invention unit 23 is maintenance mechanisms of agreement proper operation, has loading between the HSDB network node, configuration, test, Network Management Function such as synchronous.The station administration cell processing is from the station administration message of other node on the HSDB network, and message comprises: pattern control command, loading/report configuration, loopback test message; If this node is the time main website, station administration unit periodically formation time synchronization message sends to other online node, if this node is the time slave station, the station administration unit will respond the time synchronized message from the time main website.
The behavioral scaling theory diagram of this station administration unit 23 is seen shown in Figure 5, be made up of four submodules, existing as follows to each submodule function declaration: (1) station administration location mode machine module 231 enters different handling process states according to the station administration message that receives dissimilar.Its state exchange as shown in Figure 8.The processing of station administration message is divided into three types, and then corresponding to other three modules: local host bus interface module 232, local bus interface's module 233 and load report configuration messages processing module 234; (2) response message of local host bus interface module 232 treating stations administrative units 23 formation writes the transmission buffering area with data, waits to be sent.This mode comprises time synchronized message (time main website), time report, status report, configuration report and loopback test response message.For these response messages, the station administration unit is not that whole message is all put into the transmission buffering area, but frame control, source address, destination address, the word count of these message are put into, the data of information field are obtained and send by local bus when sending by transmitter; (3) local bus interface's module 233 will receive the station administration message from other station, reading of data in the message from receive buffering area, and data are write register or message filtering table, this mode comprises pattern control, time synchronized message (time slave station), loading/report configuration (as load configurations LC=1).(4) load report configuration messages processing module 234 is a kind of more special station administration message, decides station administration how to respond by the load configurations LC in the information field in this message, the state of RC, report condition RS, report time RT of reporting.
Media Interface Connector of the present invention unit 24 provides the connection between bus test interface unit 2 inner each several parts and the media units 3, realizes Data Receiving and sending function.The behavioral scaling theory diagram of Media Interface Connector unit 24 is seen shown in Figure 6, is made up of 3 submodules, and is existing as follows to each submodule function declaration: (1) transmission interface module 241; (2) the receiving interface module 242; (3) receiver module 243.Transmission interface module 241 can send message by the test lead bus medium signal of telecommunication 5 on network under control.Receiving interface module 242 by the monitor test end bus medium signal of telecommunication 5 active state and therefrom receive message, and carry out pattern check, parity check and length check, the message that verification is passed through is given receiver module 243, after receiver module 243 carries out the bus activity status monitoring to these message, " main frame subaddressing bus, host data bus, host computer control bus and main frame check bus " four kinds of host interface signals of telecommunication 4 via host interface unit 21 inside are sent to main computer unit 1, finish whole receiving course.
It is parts of realizing the fault excitation that fault of the present invention is injected unit 25, has the errored bit function is injected in each territory of Frame.Fault is injected unit 25 and is obtained fault injection signal 291 from agreement control unit 22, injects semaphore request and form generation fault injection data-signal 292 and sends to Media Interface Connector unit 24 according to fault, realizes the function that fault encourages, as shown in Figure 2.
Consider the specificity of agreement, according to each unit behavioral scaling theory diagram, the host interface unit 21, agreement control unit 22, station administration unit 23, Media Interface Connector unit 24 and the fault injection unit 25 agreement control units that are comprised for bus test interface unit 2 all adopt field programmable gate array (FPGA) to realize, for example can select the chip QL6500 of Quicklogic company for use.
The method of operation of a kind of broadband aviation electronic bus testing apparatus of the present invention, wherein: unit under test is connected with testing apparatus by media units, after the system power-up, program will be moved automatically, at this moment, select different test patterns according to the configuring condition of unit under test, have six kinds of patterns available, as shown in Figure 7:
(1) frame format operator scheme, transmission/reception control command is injected by the human-computer interaction interface on the main frame by system, this order is issued to the agreement control unit through host interface unit, realize the operation to Frame in the agreement control unit, wherein Frame comprises following territory: starting delimiter, frame control, source address, destination address, word count, information, message frame verification sequence, token frame verification sequence and termination delimiter; When carrying out fault test, inject the unit by control fault and inject errored bit to each territory of outgoing data frame, data after the injection fault send to unit under test by Media Interface Connector unit, media units, receive corresponding responsive data frame from the unit under test winding then, analyze this Frame by mainframe program again, to reach the purpose of test frame form.
(2) station administration operator scheme, system is by the human-computer interaction interface input station bookkeeping control command on the main frame, this order is issued to the station administration unit through host interface unit, the setting operation of loading between in the station administration unit, realizing bus node, configuration, test, management by synchronization function, the station administration cell processing is from the station administration message of other node on the HSDB network, and message comprises: pattern control command, loading/report configuration, loopback test message; If this node is the time main website, station administration unit periodically formation time synchronization message sends to other online node, if this node is the time slave station, the station administration unit will respond the time synchronized message from the time main website.Under this pattern, the ability of main testing station administrative unit maintenance agreement proper operation.As shown in Figure 8, Network Management Function is realized by the state exchange of self in the station administration unit.
(3) the line loop pattern of multi-site, system is by the input of the human-computer interaction interface on main frame line loop control command, this order is issued to the station administration unit through host interface unit, when system that unit under test is made up of a plurality of nodes, finish the foundation of token ring, the ring that moves back of going into ring and fault station of new website by the station administration unit.Under this pattern, mainly test the ability that the HSDB network is built ring, gone into to encircle and move back ring.
Build the ring detailed process: build the ring process by software operation and direct hardware operation common trigger, each node of the network after the triggering is node independently mutually, and at this moment, bottom is the foundation of realization loop automatically; After the realization, by the information that the drive software interface function provides ring to go up each website, these information are used to demonstrate mutual with the user.If, build the ring failure, then the form with message box provides prompting, and the user can trigger again and build ring or carry out other operations.
Move back the ring detailed process: under the normal situation of loop, the ring that moves back that can cause this node owing to fault or other reason of certain node, moving back the ring process can be by software operation and direct hardware operation common trigger, malfunctioning node after the triggering will break away from loop and become independently node, at this moment, bottom can be realized the reorganization of loop automatically, and forms new loop; After new loop formed, by the information that the drive software interface function provides ring to go up each website, these information were used to demonstrate mutual with the user.If, other situation takes place in moving back the ring process, then the form with message box provides prompting, and the user can according to circumstances trigger again and move back ring or carry out other operations.
Go into to encircle detailed process: under the normal situation of loop, when the condition on the loop is suitable, can cause that the outer new site of loop enters into loop.Go into the ring process by software operation and direct hardware operation common trigger, new each node after the triggering will enter loop becomes new a member, and at this moment, bottom can be realized the reorganization of loop automatically; And form new loop; After new loop formed, by the information that the drive software interface function provides ring to go up each website, these information were used to demonstrate mutual with the user.If, other situation takes place in going into the ring process, then the form with message box provides prompting, and the user can according to circumstances cause into ring again or carry out other operations.
(4) the message scheduling method of multipriority, system is provided with message content, destination address, priority parameters by the human-computer interaction interface on the main frame, these supplemental characteristics are issued to the agreement control unit through host interface unit, the agreement control unit is by the behavior of each priority timer of control, finish scheduling, the packing of message according to agreement, and the good message of will packing sends the Media Interface Connector unit to.Under this pattern, main test protocol control unit is to the ability of the correct scheduled transmission of different priorities message.
(5) mode state transitions pattern, system is by the human-computer interaction interface input mode state transitions order on the main frame, this order is issued to the agreement control unit through host interface unit, determine current mode state of living in by the agreement control unit, and according to the mode state transitions conversion between the various states is finished in order, as shown in Figure 9.Under this pattern, main test protocol control unit is to the ability of the correct transfer between the mode state.
(6) node key state parameter mode, system is provided with loop node number, each node physical address, each timer initial value of node, master/slave state of a control of time or the like parameter by the human-computer interaction interface on the main frame, these supplemental characteristics are issued to the station administration unit through host interface unit, finish the setting of various parameters by the station administration unit, the human-computer interaction interface that the result after will being provided with simultaneously returns main frame shows.Under this pattern, main test synthesis reflection HSDB networking state status.

Claims (4)

1, a kind of broadband aviation electronic bus testing apparatus, it is characterized in that: this device comprises: main computer unit, bus test interface unit, media units; Wherein, main computer unit connects with the bus test interface unit, and the bus test interface unit connects with media units, and unit under test connects with media units;
This main computer unit is handled in real time the data from bus, calculates and unpacks application data, mode of operation is judged, and the switching of the pattern of finishing the work, demonstration, and realize mutual control between man-machine;
This bus test interface unit injects the unit by host interface unit, agreement control unit, station administration unit, fault and the Media Interface Connector unit is formed; Wherein, the same main computer unit of this host interface unit, agreement control unit, station administration unit, Media Interface Connector unit connect, this agreement control unit injects unit, the connection of Media Interface Connector unit with station administration unit, fault, and this Media Interface Connector unit connects with media units;
The protocol processes parts that this agreement control unit is the HSDB bus; Agreement adopts linear token to transmit bus protocol, has defined token message, application token message, station administration message, four kinds of type of messages of data-message; The agreement control unit is finished the explanation to the operation of agreement regulation, comprising: one, how to determine the current state of living in of agreement control unit, and finish the conversion between the various states; Two, control the behavior of each timer, and the timer behavior outcome is made explanations; Three, can detect the message that receives and send by mistake and flow register module, and the result who detects is carried out analyzing and processing, make that reception and transmission are correctly carried out; Four, finish scheduling, the packing of message according to agreement, and the good message of will packing sends the Media Interface Connector unit to;
This station administration unit is the maintenance mechanism of agreement proper operation, has loading between the HSDB network node, configuration, test, Network Management Function such as synchronous; The station administration cell processing is from the station administration message of other node on the HSDB network, and message comprises: pattern control command, loading/report configuration, loopback test message; If this node is the time main website, station administration unit periodically formation time synchronization message sends to other online node, if this node is the time slave station, the station administration unit will respond the time synchronized message from the time main website;
It is the parts of realizing the fault excitation that this fault is injected the unit, has the errored bit function is injected in each territory of Frame;
This host interface unit is the passage that connects main computer unit and bus test interface unit inside, and it finishes following function: host interface unit receives the initialization value from the order of main computer unit and inner each register of bus test interface unit; To receiving the matching destination address verification of message; By the double port memory shared data.
This Media Interface Connector unit is made up of 3 submodules: (1) transmission interface module; (2) receiving interface module; (3) receiver module; This Media Interface Connector unit provides the connection between inner each several part of bus test interface unit and the media units, realizes Data Receiving and sending function.
2, a kind of broadband aviation electronic bus testing apparatus according to claim 1 is characterized in that: this media units adopts optical fiber.
3, a kind of broadband aviation electronic bus testing apparatus according to claim 1 is characterized in that: this media units adopts cable.
4, a kind of method of operation of broadband aviation electronic bus testing apparatus is characterized in that: after the system power-up, program will be moved automatically, at this moment, select different test patterns by mouse:
(1) frame format operator scheme, transmission/reception control command is injected by the human-computer interaction interface on the main frame by system, this order is issued to the agreement control unit through host interface unit, realize the operation to Frame in the agreement control unit, wherein Frame comprises following territory: starting delimiter, frame control, source address, destination address, word count, information, message frame verification sequence, token frame verification sequence and termination delimiter; When carrying out fault test, inject the unit by control fault and inject errored bit to each territory of outgoing data frame, data after the injection fault send to unit under test by Media Interface Connector unit, media units, receive corresponding responsive data frame from the unit under test winding then, analyze this Frame by mainframe program again, to reach the purpose of test frame form;
(2) station administration operator scheme, system is by the human-computer interaction interface input station bookkeeping control command on the main frame, this order is issued to the station administration unit through host interface unit, the setting operation of loading between in the station administration unit, realizing bus node, configuration, test, management by synchronization function, the station administration cell processing is from the station administration message of other node on the HSDB network, and message comprises: pattern control command, loading/report configuration, loopback test message; If this node is the time main website, station administration unit periodically formation time synchronization message sends to other online node, if this node is the time slave station, the station administration unit will respond the time synchronized message from the time main website; Under this pattern, the ability of main testing station administrative unit maintenance agreement proper operation;
(3) the line loop pattern of multi-site, system is by the input of the human-computer interaction interface on main frame line loop control command, this order is issued to the station administration unit through host interface unit, when system that unit under test is made up of a plurality of nodes, finish the foundation of token ring, the ring that moves back of going into ring and fault station of new website by the station administration unit; Under this pattern, mainly test the ability that the HSDB network is built ring, gone into to encircle and move back ring;
(4) the message scheduling method of multipriority, system is provided with message content, destination address, priority parameters by the human-computer interaction interface on the main frame, these supplemental characteristics are issued to the agreement control unit through host interface unit, the agreement control unit is by the behavior of each priority timer of control, finish scheduling, the packing of message according to agreement, and the good message of will packing sends the Media Interface Connector unit to; Under this pattern, main test protocol control unit is to the ability of the correct scheduled transmission of different priorities message;
(5) mode state transitions pattern, system is by the human-computer interaction interface input mode state transitions order on the main frame, this order is issued to the agreement control unit through host interface unit, determine current mode state of living in by the agreement control unit, and conversion between the various states is finished in order according to the mode state transitions; Under this pattern, main test protocol control unit is to the ability of the correct transfer between the mode state;
(6) node key state parameter mode, system is provided with loop node number, each node physical address, each timer initial value of node, master/slave state of a control of time or the like parameter by the human-computer interaction interface on the main frame, these supplemental characteristics are issued to the station administration unit through host interface unit, finish the setting of various parameters by the station administration unit, the human-computer interaction interface that the result after will being provided with simultaneously returns main frame shows; Under this pattern, main test synthesis reflection HSDB networking state status.
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