CN104394029B - A kind of total line detecting methods of AFDX based on hybrid channel - Google Patents

Abstract

The invention provides an AFDX bus detection method based on mixed channels. Firstly, the model of the device under test is specified, and the number of AFDX physical channels of the device under test is counted; then the AFDX terminal of each physical simulation card is opened respectively according to the generated configuration table file Port: Select the test option of the AFDX bus physical channel, compare the received test data of one or more channels for sample comparison or validity judgment, obtain the final test result, and generate the final test report. The present invention only uses one independent AFDX bus comprehensive test platform to realize real-time and efficient distributed detection of the functions and performances of multiple avionics devices, and realizes a more efficient and convenient AFDX bus test, which greatly saves Financial and human resources.

Description

A Method of AFDX Bus Detection Based on Mixed Channels

technical field

The invention belongs to the technical field of aviation bus testing, and relates to a real-time bus monitoring and testing method for multiple terminals and multiple channels of an avionics full duplex switched Ethernet (Avionics Full Duplex Switched Ethernet).

Background technique

AFDX stands for Avionics Full Duplex Switched Ethernet (Avionics Full Duplex Switched Ethernet), which is a protocol standard defined for data exchange between avionics systems, and is based on ARINC429 and 1553B. Bus communication protocol specification (ARINC 664 Part7). AFDX network has become a new generation of avionics system data transmission network by improving the traditional Ethernet technology, relying on its superior network communication performance such as virtual link technology, dual redundancy management, and deterministic communication network delay. The AFDX network is derived from the switched Ethernet with the switch as the core. It has a similar composition and communication mode to the typical Ethernet, but since it was born for avionics equipment, the AFDX bus has high security and certainty. performance and reliability, and formed the related standards of ARINGC 664 series.

With the introduction of the domestic large aircraft project into China, the development of various equipment based on AFDX bus technology is accelerating. Although foreign countries have relatively mature and systematic testing technology for AFDX bus technology, it is limited to the physical layer and link layer. Distributed testing of the function and performance of airborne equipment by a variety of mixed channel technologies has become the main field of AFDX research in China.

Contents of the invention

In order to overcome the deficiency that commercial boards and their supporting software in the prior art are only limited to the data capture of the physical layer and the link layer, and do not cover the upper network layer and application layer, the present invention provides a hybrid-channel-based AFDX bus detection Method, through the use of single-channel and multi-channel mixed-channel detection technology, realize real-time distributed remote detection of various AFDX terminal equipment, according to the functions and performance characteristics of these terminal equipment, focus on customized function simulation, performance assessment, The functions of detection, result summary and analysis have achieved the distributed detection of various avionics equipment AFDX terminals without using the AFDX switch.

The technical solution adopted by the present invention to solve its technical problems comprises the following steps:

1) Specify the model of the device under test, and count the number of AFDX physical channels of the device under test;

2) According to the interface ICD configuration of each AFDX physical channel, the same number of AFDX configuration table files are automatically generated according to the number of AFDX simulation cards, and one AFDX simulation card is correspondingly configured with one AFDX configuration table; according to the data content of the AFDX link interface, Edit the virtual link number, source port number, destination port number, UDP port number and MTU of port 1 and port 2 of each AFDX terminal, and generate a configuration table file;

3) According to the AFDX configuration table, call the API function encapsulated by the AFDX emulation card driver, and open the AFDX terminal port of each physical emulation card;

4) According to the test requirements of different avionics equipment, select the test options of the AFDX bus physical channel, including single channel, multi-channel and mixed channel selection; the test process of each channel is as follows:

a) Single-channel test process: complete the setting of one terminal channel of one AFDX emulation card, first select the number of test items for this channel, and then call the single-channel test cases generated according to the interface ICD configuration; then sort these test cases , event or periodically send to the device under test through a single channel of the AFDX bus, and receive the return test result of the device under test at the same time;

b) Multi-channel test process: To set the two terminal channels of an AFDX emulation card, first select the type and quantity of test items for the terminal A and terminal B channels respectively. If the types of the terminal A and terminal B channels are the same, use the same Test items of different types can complete the test. If the types are different, you need to select the number of test items for the terminal A and terminal B channels respectively; secondly, call the multi-channel test cases generated according to the interface ICD configuration; and then use these test cases according to the test order Periodically or periodically send to the device under test through the AFDX bus terminal A and terminal B channels, and at the same time receive the return test results of the device under test in these channels;

c) Mixed channel test process: set multiple terminal channels of multiple AFDX emulation cards, respectively configure the type and quantity of test items for each terminal channel of each emulation card, and call each of the test items generated according to the interface ICD configuration. Test cases of the test channel; then sort these test cases according to different test channels, send them to the device under test through multiple mixed channels in an event or periodic manner, and collect the return test results of the device under test in these channels;

5) Perform sample comparison or validity judgment on the received return test data of one or more channels, obtain the final test result, and generate the final test report.

The beneficial effect of the present invention is that only one independent AFDX bus comprehensive test platform is used, and it is not necessary to connect and configure the AFDX switch, and it is possible to use the application software to call a variety of aviation Network configuration and test data options of electronic equipment, so as to realize real-time and efficient distributed detection of the functions and performance of multiple avionics equipment. The AFDX bus test technology based on the mixed channel in the present invention solves the distributed parallel test of various avionics equipment that the previous AFDX bus test only focuses on the physical layer and the link layer and needs to configure complex switches to realize, and is improved to not only It can test the AFDX bus to test the physical layer and link layer, and can also call different avionics data configurations to test the network layer and application layer through software, so as to realize more efficient and convenient AFDX bus test, which greatly saves financial resources and manpower.

Description of drawings

Figure 1 is a schematic diagram of the principle of the AFDX virtual link;

Figure 2 is a schematic diagram of the traditional AFDX bus test system;

Figure 3 is a schematic diagram of the composition of the AFDX bus comprehensive test platform;

Fig. 4 is a test flow chart of the AFDX bus comprehensive test platform.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

The invention provides a real-time, high-efficiency and accurate measurement technology for the distributed and integrated testing of large aircraft avionics equipment. The bus detection method is realized based on the AFDX bus technology of the avionics equipment of large aircraft, focusing on customizing the functions of dynamic monitoring, real-time detection, fault statistics and analysis of all functions and main performance of several avionics equipment.

By embedding two or more AFDX emulation cards based on PCI interface into the AFDX bus comprehensive test platform, by loading different AFDX network configuration table files, calling the developed application software processing module, and using the AFDX bus mixed channel test technology, to Realize distributed detection of various avionics equipment.

The main functions realized by the present invention are as follows:

1. Realize AFDX emulation card single-channel, multi-channel or mixed-channel configuration;

2. Realize the selection and monitoring of general single-channel physical layer data test items;

3. Realize the selection and monitoring of general multi-channel physical layer data test items;

4. Realize the selection and monitoring of multiple avionics equipment mixed channel data test items;

5. Analyze and evaluate the test results of various channel data;

Concrete detection process of the present invention is as follows:

1. Generate a configuration table file according to the test requirements to realize the initialization of the AFDX board;

According to the function and performance test requirements of avionics equipment, the application test software can be used to automatically generate the same number of AFDX configuration table files according to the number of AFDX simulation cards according to the interface ICD configuration of each test channel. According to the configuration table file, the corresponding AFDX terminal port can be opened to complete the initialization of the AFDX board.

2. Call the mixed channel test item option of the device under test

Different avionics devices have different functions and performance testing requirements. The self-developed application software dynamically invokes the edited test modules of corresponding avionics devices and performs software matching with the physical AFDX terminal. The application software can call the processing flow of the corresponding software module according to the different test options. It mainly includes single-channel physical layer data test options, multi-channel physical layer data test options and mixed-channel physical and application layer test options.

3. Complete the automatic detection of the function and performance of the tested equipment, and generate a test report.

After the call of the test items of the mixed channel is completed, the function and performance of the avionics under test are tested item by item by automatically calling the test data through the software. The application software generates a test report for each tested avionics item by item based on the difference between the expected test data and the actual returned test data, and displays them in summary.

This method provides a real-time, efficient and accurate measurement technology for distributed and integrated testing of large aircraft avionics equipment. The bus detection method is based on the AFDX bus mixed channel test technology to realize the AFDX bus of various avionics equipment of large aircraft, and focuses on customizing the dynamic monitoring, real-time detection, fault statistics and analysis of all functions and main performance of several avionics equipment and other functions. The distributed detection of various avionics equipment AFDX terminals can be realized without going through the AFDX switch.

It can be seen from Figure 1 that the AFDX terminal in the avionics system must exchange data frames through a VL. It can be said that the VL is the communication basis of AFDX. Virtual Link (virtual link) is a conceptual communication channel, and each VL defines a logical one-way connection, that is, from a source system to one or more destination systems. Each VL is logically isolated from each other, and each VL has a dedicated bandwidth guarantee, and the data transmission of multiple VLs does not affect each other within the effective bandwidth. Between a typical AFDX end system, there must be two independent physical paths, port A and port B. These two ES terminals form the data transmission path of the AFDX bus. As shown in Figure 1, each frame of data will be sent from the source ES The terminal is transmitted to the destination ES terminal through two physical paths at the same time. After receiving the first valid frame, the destination ES terminal will immediately upload it to the application program for processing; once the destination ES terminal receives a valid data frame, the following is the same Frames with sequence numbers are discarded.

It can be seen from Figure 2 that the traditional AFDX bus test system is mainly composed of a display and control host, a single commercial AFDX simulation card, commercial test software, and an AFDX switch. First of all, only one commercial AFDX emulation card can be installed in the display and control host, so when testing multiple avionics devices, it must be connected to a commercial AFDX switch that is used with the emulation card, and multiple AFDX switches can be configured through complex AFDX switches. To test multiple channels of an avionics device, the AFDX switch must be reconfigured when the test object changes. Secondly, the test software of the system generally uses mature commercial test software from developers, which can only realize simple AFDX bus physical layer and link layer monitoring, and cannot customize the network layer and application layer for avionics equipment, and carry out secondary software development At the same time, it cannot support the strategy of mixing single-channel and multi-channel, which greatly limits the flexibility of testing.

It can be seen from Fig. 3 that the AFDX bus comprehensive test platform of the present invention is mainly composed of three parts: display and control host, application test software and AFDX simulation card. The application test software runs on the display and control host, and the AFDX simulation card is inserted into the display and control host through the PCI bus. In this test platform, two AFDX simulation cards are currently used for testing, and each AFDX simulation card includes two terminal interfaces ES1 and ES2. The specific composition and related requirements are as follows.

1. Display and control host

The hardware configuration of the display control host should not be lower than the following: processor above 1Ghz, memory above 512Mb, hard disk above 100Gb. More than two AFDX simulation boards with PCI interface should be installed.

Display control host operating system should configure one of windows2000 or windows xp or windows vista, and has successfully installed Visual C++6.0 or above.

The display and control host should install the relevant driver program of the selected AFDX emulation card, and be able to open the operating software of the AFDX emulation card normally.

2. Application test software

It runs under the windows operating system of the display and control host, adopts an object-oriented programming framework, and mainly completes human-computer interaction, AFDX emulation card single-channel or multi-channel configuration, general single-channel data test item selection, general single-channel data item monitoring, general Statistical analysis of single-channel data item test, selection of test items of mixed channel of special program for each avionics equipment, monitoring of data item of mixed channel of special program, selection of data item sent by mixed channel of special program, display of data item received by mixed channel of special program and mixed channel of special program Analysis of test results.

3. AFDX emulation card

At present, the AFDX simulation board used in the AFDX bus comprehensive test platform is a simulation board independently developed by a domestic research institute. The biggest advantage of this board is that it can realize multiple boards under the premise of strictly meeting the ARINC 664 PART 7 standard. It is integrated into a comprehensive test platform, and can support parallel calls of upper-layer application software, so as to support AFDX bus test technology based on mixed channels.

As can be seen from Fig. 4, the steps of the concrete detection method of the present invention are as follows:

1) Specify the type of test equipment and the number of ports required;

Since the present invention can perform distributed and parallel tests on the functions and performances of multiple avionics devices through the AFDX bus, the contents and formats transmitted by the AFDX bus channels of each device are different, so it is necessary to count the AFDX physical channels of the tested devices The quantity is connected with the AFDX bus comprehensive test platform through a dedicated connection.

2) Generate AFDX configuration table on demand;

After preliminarily determining the number of AFDX physical channels to be tested, according to the interface ICD configuration of each test channel, the same number of AFDX configuration table files are automatically generated according to the number of AFDX simulation cards, that is, one AFDX simulation card is correspondingly configured with one AFDX configuration table. According to the data content of the AFDX link interface, edit the virtual link number, source port number, destination port number, UDP port number and MTU of port 1 and port 2 of each AFDX terminal to generate a configuration table file.

3) Open the corresponding AFDX port;

According to the relevant configuration information in the AFDX configuration table, the API functions encapsulated by the AFDX emulation card driver are called respectively, and the AFDX terminal ports of each physical emulation card are respectively opened to complete the test preparation.

4) Call the mixed channel test item option of the device under test;

According to the test requirements of different avionics equipment, the test options of the AFDX bus physical channel are selected. At present, the AFDX bus comprehensive test platform supports three options: single channel, multi-channel and mixed channel selection. The testing process for each channel is as follows:

a) Single channel test process:

The process of the single-channel test method is relatively simple, and only one terminal channel setting of one AFDX emulation card needs to be completed. Firstly, select the number of test items for this channel, that is, how many items to detect on the device to be tested through this channel; secondly, call the single-channel test cases generated according to the interface ICD configuration; then sort these test cases, event or cycle It can be sent to the device under test through a single channel of the AFDX bus, and at the same time receive the return test result of the device under test to complete the single channel automatic detection.

b) Multi-channel test process:

The multi-channel test method needs to set up two terminal channels of one AFDX emulation card. First, select the type and quantity of test items for the channels of terminal A and terminal B respectively. If the types of channels of terminal A and terminal B are the same, the test can be completed by using the same type of test items. If the types are different, you need to select terminal A and terminal B respectively. The number of test items of the channel; secondly, call the multi-channel test cases generated according to the interface ICD configuration; then send these test cases to the device under test through the AFDX bus terminal A and terminal B channels according to the test sequence event or period, and receive The test results of the devices under test in these channels are returned to complete multi-channel automatic detection.

c) Mixed channel test process:

The test method of mixed channels needs to set up multiple terminal channels of multiple AFDX emulation cards. The present invention takes two AFDX emulation cards as an example, first configure the test item types and quantities of the terminal A and terminal B channels of the first emulation card respectively, and then configure the test of the terminal A and terminal B channels of the second emulation card The type and quantity of items; since the mixed channel is selected, the types of adjacent channels are different, it is necessary to select the type and quantity of test items for each test channel separately; secondly, call the test of each test channel generated according to the interface ICD configuration use cases; then these test cases are sorted according to different test channels, event or periodic are sent to the device under test through multiple mixed channels, and at the same time, the return test results of the tested device in these channels are collected to complete the automatic detection of the mixed channel .

5) Generate a test report;

After automatic testing of the equipment under test by calling unused software modules, the test data returned by one or more channels is received, and the final test result is obtained by comparing these data with samples or valid judgments . The final test report is generated according to whether the testability of different tested equipment is passed.

This technology can be applied to multiple avionics equipment comprehensive test systems, which can save the flexibility and complexity of multiple avionics equipment tests to the greatest extent.

The above-mentioned AFDX bus detection technology method based on mixed channels does not constitute a limitation to the protection scope of this technology. Any modifications, equivalent replacements and improvements made within the spirit and principles of the new technology should be included in the protection scope of the claims of the new technology.

Claims (1)

1. the total line detecting methods of a kind of AFDX based on hybrid channel, it is characterised in that comprise the steps：

1) model of clear and definite equipment under test, counts the AFDX physical channels quantity of equipment under test；

2) configured according to each AFDX LI(link interface)s ICD, the quantity according to AFDX artificial cards automatically generates same amount of AFDX Configure list file, one piece of AFDX artificial cards correspondence one AFDX allocation list of configuration；According to the data content of AFDX LI(link interface)s, compile The port 1 of every 1 AFDX terminal and virtual link number, source port number, destination slogan, UDP port number and the MTU of port 2 are collected, Generation configuration list file；

3) call AFDX to emulate the api function that card driver is encapsulated respectively according to AFDX allocation lists, each AFDX is opened respectively The AFDX terminal prots of artificial card；

4) according to the testing requirement of different avionic devices, the test option of AFDX bus physical passages is selected, wrapped Include single channel, multichannel and hybrid channel selection；The test process of every kind of passage is as follows：

A) single channel test process：1 terminal passageway for completing 1 AFDX artificial card is set, and the test of the passage is selected first Item quantity, next calls the single channel test case for configuring and generating according to interface ICD；Then these test cases are arranged Sequence, event or periodically through AFDX buses single channel to be devices under send, while collecting the passback being devices under Test result；

B) multiple channel test process：2 terminal passageways to 1 AFDX artificial card are configured, first respectively selection terminal A and The test item species and quantity of terminal channel B, if terminal A is identical with the species of terminal channel B, use same kind of test Item can just complete test, need to select the test item quantity of terminal A and terminal channel B respectively if species is different；Secondly Call the multiple channel test use-case for configuring and generating according to interface ICD；Then by these test cases according to testing sequence event Property or periodically through AFDX bus terminations A and terminal channel B to being devices under sending, be tested while collecting in these passages Try the passback test result of equipment；

C) hybrid channel test process：Multiple terminal passageways to multiple AFDX artificial cards are configured, and are respectively configured each piece The test item species and quantity of each terminal passageway of artificial card, call respectively according to interface ICD configure and generate it is each The test case of TCH test channel；Then these test cases are ranked up according to different TCH test channels, event or cycle Property by multiple hybrid channels to be devices under send, while collect be devices under in these passages passback test knot Really；

5) the passback test data of the one or more passages received is subjected to sample comparison or Effective judgement, drawn final Test result, generate final test report.