67 results about "Avionics Full-Duplex Switched Ethernet" patented technology

The invention relates to an avionic full-duplex switched-type Ethernet network card and an integration method thereof. Allocation information of various layers and a communication interface, required by a terminal system, is downloaded into an RAM (Random Access Memory) in an FPGA (Field Programmable Gate Array) chip, and all functional modules are in circuited connection with the communication interface, therefore, four protocols of a transmission layer UPD, a network layer IP (Internet Protocol), a link layer Virtual Link and a physical layer PHY are integrated on a board card. The invention finishes most functions of the whole AFDX (Avionic Full-duplex); the functions of a soft part are achieved just by simply writing data and ports into a transmission sharing memory of the network card and reading the data and the ports from a reception sharing memory, which is not basically relational to a communication protocol and very simple in operation. The invention can be directly applied to a data loading system of an AFDX bus, an AFDX simulation system, an AFDX integration system, and other application systems.

The invention provides a simulation and demonstration system for design and validation of an AFDX (Avionics Full Duplex Switched Ethernet) network and a simulation and demonstration method thereof, which are used for guiding the design of the AFDX network. The simulation and demonstration system mainly comprises an integrated avionics network design module, a loaded avionics communication task module, a plausibility check and validation module, a simulation module, a loadable configuration file output module, a network demonstration system module, and the like and has the functions of designing the avionics interconnection structure, simulating communication tasks of the AFDX network and validating the designed network topology in the network demonstration system module. The simulation and demonstration method is used for designing the network topology, simulating the avionics communication tasks and demonstrating and validating the designed network to obtain related technical parameters and provide the reference for the design of the AFDX network. The invention provides a more reliable scheme for the design of the AFDX network, shortens the design time, saves the cost, and improves the design efficiency.

The invention discloses a method and device of simultaneously supporting AFDX ((Avionics Full-duplex Switched Ethernet) and common Ethernet switching, which mainly solves the problem that AFDX switching equipment in the prior art cannot simultaneously support the AFDX and common Ethernet switching. The method comprises the steps of: (1), extracting grouping feature information; (2), receiving scheduling groups; (3), searching a forwarding table; (4), filtering and policing; (5), enqueueing the group; and (6) sending the scheduling groups. The device comprises an input caching module, a receiving scheduling module, a port lookup table module, a sharing lookup table module, a filtering and policing module, an output queue module, a sending scheduling module, and an output caching module. The invention has the advantages of improving the flexibility of an AFDX networking mode and the feasibility that an Ethernet information terminal in a manned space flight domain machine is accessed to the AFDX, and sufficiently utilizing the residual bandwidth in the AFDX, and effectively improving the bandwidth utilization rate of the AFDX, and is applicable to network and exchange aspects.

The invention discloses an avionics full duplex switched Ethernet (AFDX) protocol switching engine based on shared storage, which comprises a switching port, a shared storage exchange structure, a virtual link configuration table, a management information base (MIB) module, a global counter, a shared cache memory access interface and an exchange terminal interface. The switching engine can be widely used for researching and developing the existing avionics bus of a domestic military/ civil aircraft, and is remarkable in market prospect and economic benefit.

The invention relates to a communication network for an aircraft. For overcoming the limitation of the bus network architecture of the air craft in the prior, the invention provides a network architecture of centralized management. In one aspect, the invention provides a network for the aircraft, which comprises a core processing subsystem, at least one switching device for communicating with the core processing subsystem, and at least one terminal subsystem for communicating with the at least one switching device. The processing software and management software of the terminal subsystem are integrated in the core processing subsystem; data excgabge between the terminal subsystem and the core processing subsystem is performed by an avionics full duplex switched Ethernet (AFDX) bus; and thus, the sharing of time, processor resources and memory resources is promoted. The terminal subsystems can perform the initial preprocessing of the data of the terminal subsystems and exchange the data through the AFDX bus; therefore, the utilization rate of the network resources is improved, it is convenient to transmit data, and it is simple and convenient to install and maintain the network.

The invention discloses a service flow shaping method and a service flow shaping device for a cascaded port of an avionics full duplex switched Ethernet (AFDX) switch. The main problems of relatively stronger switching delay jitter of packets and incapability of transmitting high-priority packets on time in the prior art are solved, and a system can be conveniently cascaded. The method comprises the following steps of: (1) extracting packet scheduling information; (2) extracting the information of a time registry; (3) receiving and scheduling the packets; (4) selecting and sequencing the packets; (5) updating time tags; (6) transmitting and scheduling the packets; and (7) updating a time registry. The device comprises an input caching module, a receiving scheduling module, a time registry module, a packet information storage area module, a time tag module, an output queue module, a transmission scheduling module and an output caching module. The method and the device have the advantages that: the determinacy of the delay jitter of the packets can be ensured; the forwarding delay jitter of the packets can be effectively reduced; the high-priority packets can be transmitted on time; and the method and the device are applied to the traffic shaping of the AFDX switch.

The invention discloses an airborne collision avoidance and ground proximity warning monitoring system which comprises a set of four-channel L band antennas and a system host machine. The system host machine is formed by a data processing module, an RF module, a baseband module, and a power module. The four-channel L band antennas are connected with the RF module through coaxial cables. The RF module is connected with the data processing module through the baseband module. The system host machine obtains aircraft body state information through the connection of an avionics full duplex switched Ethernet (AFDX) or a self-bring interface unit. The system has the advantages that the most reasonable monitoring and alarm information and avoidance advice are provided for a pilot, the working pressure of a pilot is reduced, an man-made error determination is avoided, and the flying safety of an airplane is increased; the reuse of resources is realized, the weight, volume, power consumption and cost of airplane monitoring equipment are reduced, and the reliability and scalability of the equipment are improved.

The embodiment of the invention discloses a network testing device comprising a data acquisition module, an end system testing module, a switching unit testing module and a monitoring module, wherein the data acquisition module is used for coupling a port of a switching unit and/or a port of an end system in a communication way so as to acquire data from the port; the end system testing module is coupled to the data acquisition module and used for carrying out first test on the data acquired from the port of the end system; the switching unit testing module is coupled to the data acquisition module and used for carrying out second test on the data acquired from the port of the switching unit; and the monitoring module is coupled to the switching unit testing module and the end system testing module in the communication way and used for acquiring and presenting the results of the first test and/or second test. Through the scheme, AFDX (Avionics Full-Duplex Switched Ethernet) network design, configuration, deployment and test monitoring are combined so that the systematicness and the degree of automation for an AFDX network test are improved.

The invention discloses a flow control method and device of an AFDX switch, wherein the method comprises the following steps of: monitoring data link information at an entrance by using the switch to acquire the arrival time of the data link information; judging whether the data link information is valid or not according to the arrival time of the data link information by using the switch; and sending the valid data link information by using the switch. Through the invention, the performance and the capacity of the AFDX network switch can be improved.

The embodiment of the invention provides a method for testing an end system in a network, and the method comprises the following steps: configuring a simulation unit of the end system for correspondingly performing communication with the end system; acquiring end communication data of the end system; testing the end communication data; and acquiring and showing the analysis result of the end communication data through a monitoring module. Through the scheme, the systematic property and degree of automation of AFDX (avionics full duplex switched Ethernet) network testing are improved.

The invention discloses an AFDX (Avionics Full Duplex Switched Ethernet) end-to-end delay bound claculation method based on a random network calculus. The method comprises the following four steps of: firstly, determining a flow chart of a dataflow in an entire network, and drawing out the flow chart of the dataflow; secondly, analyzing a constituent part of an end-to-end delay of the dataflow in the entire network, thereby obtaining a constituent form of a fixed delay and a variable delay of the end-to-end delay; thirdly, calculating the variable delay; and fourthly, obtaining an end-to-end delay bound of the dataflow to be analyzed. According to the invention, influence of the dataflow is taken into consideration in case of a random interference or an emergency, and a greater grain is achieved from statistics of a duplex independent communication flow; meanwhile, influences of high/low priority configuration and a scheduling algorithm on the delay in an exchanger are taken into full consideration, therefore, not only can an end-to-end delay bound value be precisely obtained and unnecessary resource waste can be avoided, but a network performance can be predicated in a design stage, waste is avoided when an actually-built network is unqualified.

The invention discloses a simple simulation testing device for an AFDX (avionics full duplex switched Ethernet) switch. The simple simulation testing device comprises a testing host, and is characterized by also comprising a loopback device; the testing host comprises two testing ports; the loopback device comprises two first ports and N second ports, wherein the two first ports are respectively connected with the testing ports of the testing host, and the N second ports are respectively connected with N switch ports of a tested AFDX switch; the first ports are connected with the second ports in the loopback device according to the connecting number of the first ports and the testing ports, and loopback processing is performed among the remaining second ports; the invention also discloses a testing method for the simple simulation testing device for the AFDX switch. According to the simple simulation testing device and the testing method thereof disclosed by the invention, the weight and the size of a testing cable are greatly reduced, and the space requirements of environmental testing sites, environmental testing equipment and the like can be met very well.

The invention provides a remote intelligent interface unit and a control method. The problems that transmission of an existing sensor interface is in mutual interference, and signals of the sensor interface and signals of an effector interface are in mutual interference are mainly solved. The remote intelligent interface unit comprises an Avionics Full Duplex Switched Ethernet (AFDX) network interface which is connected with an integrated core processor, and the AFDX network interface is connected with an internal bus through a dual-port random access memory (DPRAM). The remote intelligent interface unit further comprises a storer, a control logic device, a power inverter and an external interface which are respectively connected with the internal bus. The storer is connected with the internal bus through a PPC 8245. The remote intelligent interface unit can achieve nearby collection, timely converting and distribution control of interface data, and enable a system to be expanded and updated conveniently.

The invention provides a simulation verification system for an AFDX (Avionics Full Duplex Switch Ethernet) network of an avionics system based on OPNET. The system comprises an end system sending data module, a switch forwarding data module, an end system receiving data module and an AFDX network transmission link module, wherein the end system sending data module is used for generating a data packet which conforms to an AFDX network protocol and sending the data packet to a switch; the switch forwarding data module is used for managing and forwarding the data packet sent by the end system sending data module; the end system receiving data module is used for carrying out unpacking processing on the received data packet forwarded by the switch forwarding data module; and the AFDX network transmission link module is used for connecting a physical device in an AFDX network. The system in the embodiment of the invention is constructed by the AFDX network based on OPNET, the network structure is integrated, the function is complete, the system is convenient to verify the network performance and perfectly research the AFDX protocol standard, and meanwhile, fault injection is carried out on each level, so that a data source can be provided for development of a network health management algorithm.

The invention provides a simulation system and a simulation method of an AFDX (Avionics Full Duplex Switched Ethernet) network. Both an end system and an exchanger in the AFDX network are abstracted into discrete event simulation nodes by adopting a discrete event mechanism, AFDX information is abstracted into discrete events for the discrete event simulation nodes, the transmission behavior of the AFDX information in the end system and the retransmission behavior of the AFDX information transmitted from the end system between different ports of the exchanger are simulated by utilizing the transmission and retransmission behaviors of the discrete events, and performance parameters of the AFDX network can be obtained on the basis of the simulation. According to the simulation system and the simulation method, a real information operation mechanism of the AFDX network is simulated by utilizing the discrete events, so that the performance parameters of the AFDX network after each discrete event is ended can be conveniently counted, the system design of the AFDX network is further optimized, and the iteration cycle of the system design is shortened; additionally, an end system simulation module in the simulation system is automatically introduced on the basis of an interface control document, so that the system verification time is reduced.

The invention provides a miniature low-power consumption comprehensive kernel processor based on avionics full duplex switched Ethernet (AFDX), which mainly solves the problems that the existing processor is low in integrated degree and reliability and poor in maintenance and indemnificatory performance and comprises a data processing module used in task computing, data integration, system control and management and bus communication, a network support module for high-speed data transmission among all modules of the kernel processor and between the modules and a front end sensor and a power source module for supplying power to the modules. The kernel processor has capability in processing of data, signals, graphs and videos and high-capacity memory power, simultaneously has high-speed network communication capacity, system tolerance reconstitution capacity and has the advantages of being good in performance, light in weight, small in volume, low in power consumption and the like.

The invention belongs to the computer network technique and relates to a method for sharing credit by multiple virtual links in an AFDX network switch. According to the invention, the thought of sharing a same credit account by a set of virtual links of multiple ports of the AFDX network switch is proposed; the method for sharing the same credit account by the set of virtual links of the multiple ports of the AFDX network switch is designed; the problem of wasting network link bandwidth resource and logic resource resulted from occupying the credit account respectively by every VL is solved. The solution of the invention is featured by saving resource, easy realization and good expandability.

The invention provides an AFDX (Avionics Full Duplex Switched Ethernet) network delay reducing method, which relates to the field of communication engineering. The AFDX network delay reducing method adopts a compound delay adjustment way, which comprises the following steps of after adjusting a BAG value of a VL with delay being more than a preset delay threshold between two assigned transmission terminals, judging the delay of each VL with the adjusted BAG value exceeds the preset delay threshold or not, if yes, transmitting assigned business data in the VL with the adjusted BAG value and the delay being more than the preset delay threshold through the VL with the delay being not more than the preset delay threshold between the two transmission terminals, so that the business volume in the VL with the delay being more than the threshold is shared by other VLs (VLs with the delay being not more than the preset delay threshold), the delay of the VLs with higher delay is reduced, the business volume sof VLs are relatively equal, and the business data transmission efficiency of the whole VL is also improved.

The invention discloses a byte-based filtering and policing tube system and a byte-based filtering and policing tube method of an avionics full duplex switched Ethernet (AFDX) switch, mainly solves the problem of frame loss under the condition of larger jitter and different frame lengths. The system comprises a cache, a lookup table, a filtering module, a policing tube module and a determination module, wherein the cache stores data frames and extracts the virtual link (VL) and the frame information of the data frames; the VL is used for searching for the filtering parameters of the data frames in the lookup table; the filtering parameters are compared with the frame information in the filtering module to determine whether the data frames meet a filtering requirement; a byte leaky bucket algorithm is used for controlling data frame traffic in the policing tube module simultaneously; and finally, the determination module is used for determining whether the data frames are permitted to enter a switched network. According to the invention, the implementation method is simple, system resources are saved, the pass rate of the data frames is high, the network switching performance can be improved, and the system and method can be used for filtering data frames and controlling flow rate in an AFDX.

The invention discloses a method for optimizing an AFDX (Avionics Full Duplex Switched Ethernet) network path under the consideration of risk balance. The method comprises the following steps: calculating the risk degree of an end system in an AFDX network; calculating the risk degrees of VLs (Virtual Links) according to the risk degree of the end system; calculating the risk degree of each physical link according to the risk degrees of all VLs borne on the physical link; calculating a risk degree standard deviation according to the risk degrees of all physical links; building an effective physical link set of each VL; and performing risk balance on effective physical links by a particle swarm algorithm according to the risk degree standard deviation obtained in the step IV and the effective physical link sets of the VLs obtained in the step V. The method has the advantages that the problem of risk balance is considered in the path optimization process of the AFDX network; the situation that a single physical link bears a plurality of VLs having great influences on airplane safety is reduced; and the airplane safety is enhanced. The particle swarm algorithm is introduced into the path optimization process, so that an optimized path satisfying a risk balance condition can be found, thereby reducing the risk standard deviation among the physical links.

The invention discloses a time delay index test device for an exchange technology of an AFDX (Avionics Full Duplex Switched Ethernet Network) exchange product. The device comprises a network terminalsimulation module and a network channel construction module; port 1 to port N of the network channel construction module establish an external connection with N ports of a measured product one by one;port 1+N establishes an external connection with port 2+N; port 4+N respectively establishes an internal connection with port 1 to port N and port 1+N; port 3+N establishes an internal connection with port 2+N; port 4+N establishes an external connection with a port A of the network terminal simulation module; and port 3+N establishes an external connection with a port B of the network terminal simulation module. The time delay index test device for the exchange technology of the AFDX exchange product provided by the invention can collect the technical delay on all forwarding channels of themeasured product very quickly, thereby achieving effective evaluation of technical delay indexes, and providing guarantees for the certainty of an aviation network bus.