CN113938196B - Bus network communication method based on FC-AE-1553 optical fiber bus architecture - Google Patents
Bus network communication method based on FC-AE-1553 optical fiber bus architecture Download PDFInfo
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- H04B10/25—Arrangements specific to fibre transmission
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Abstract
The invention provides a bus network communication method based on an FC-AE-1553 optical fiber bus architecture, which belongs to the technical field of communication and comprises a bus architecture implementation method and a bus network communication method; the bus architecture implementation method comprises the following steps: the method comprises the steps of building a network bus architecture, determining a network time synchronization method, determining a network synchronization time preset method and determining a scheduling time slot division method; the bus network communication method comprises the following steps: the main node broadcasts a time synchronization code to the switch equipment, and the switch equipment establishes a synchronization relationship with each node respectively; the bus network divides a fixed time slot according to the communication requirement, and each node carries out data communication in the fixed time slot range; the master node broadcasts time synchronization codes to other nodes periodically, and the slave nodes receive the time synchronization codes and then perform localization processing to form scheduling period synchronization signals with consistent initial time; and when the local time code of the slave node is consistent with the expected time, triggering the generation of a scheduling cycle synchronous signal. The invention solves the problem of low reliability of the existing FC-AE-1553 bus network communication.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a bus network communication method based on an FC-AE-1553 optical fiber bus architecture.
Background
The performance requirements of the aerospace electronic system on the information interaction network are higher and higher, the bus bandwidth of the aerospace electronic system is improved, the number of allowed access terminals is increased, time delay is reduced, and instantaneity is improved, and the aerospace electronic system is one of important research directions in the aerospace electronic field.
The Fiber Channel technology is more and more widely applied to the aerospace field at home and abroad by virtue of the characteristics of high bandwidth, low delay and high reliability, FC-AE (Fiber Channel-environments) issues protocol standards for Avionics such as FC-AE-1553, FC-AE-ASM and FC-AE-RDMA, and FC-AE-1553 and FC-AE-ASM protocols are widely applied at home and abroad.
FC-AE-1553 is used as a command response type protocol, can construct a deterministic network by virtue of high speed, high reliability and support of real-time deterministic transmission behavior, is suitable for aerospace instruction control, data management, load equipment data transmission and the like, and is increasingly widely applied. The FC-AE-1553 network comprises NC (network controller, FC-AE-1553 network controller) and NT (network Terminal, FC-AE-1553 network Terminal), switch or ODN (optical distribution network).
The aerospace electronic data bus is a central nerve and a data communication hub of an aerospace electronic and electrical system, and the FC-AE-1553 aerospace bus protocol based on the fiber channel has the characteristics of high bandwidth, high reliability, easiness in expansion and the like, so that the trend of becoming a new generation of aerospace field electronic data bus protocol is more and more obvious.
At present, most of research on FC-AE-1553 aviation bus protocols in the industry is in aspects of chip design, network compatibility, development of test equipment and the like under a simple topological structure, and few researches on complex topological structures and performances of the protocols are carried out. With the improvement of the digital networking degree of the aerospace electronic and electrical system and the expansion of the network range, the simple topology can not meet the actual requirements. However, the complexity of the topology may bring changes to the network performance, and the aerospace electronic and electrical system has extremely high requirements on real-time performance and reliability, which poses a challenging problem for the future research on the aerospace electronic and electrical system network: how to ensure the real-time performance and reliability of the network under the complex topology, and the real-time routing and flow control of the complex network.
At present, the conventional FC-AE-1553 bus network does not adopt a scheduling cycle time presetting method when network scheduling is carried out, the network lacks unified time synchronization and time planning, the fault isolation capability is insufficient, the method is applied to the field of high-reliability bus network communication of an aerospace electronic and electrical system, the reliability further improves the space, and needs to be improved.
Disclosure of Invention
The invention provides a bus network communication method based on an FC-AE-1553 optical fiber bus architecture, and aims to solve the problems that the prior art cannot realize FC-AE-1553 bus network communication based on time triggering and is low in communication reliability.
The purpose of the invention is realized by the following technical scheme:
a bus network communication method based on FC-AE-1553 optical fiber bus architecture comprises an FC-AE-1553 optical fiber bus architecture implementation method and an FC-AE-1553 optical fiber bus network communication method based on time triggering; the FC-AE-1553 optical fiber bus architecture implementation method comprises the following steps: building an FC-AE-1553 network bus architecture, determining an FC-AE-1553 network time synchronization method, determining an FC-AE-1553 network synchronization time preset method and determining an FC-AE-1553 scheduling time slot division method; the FC-AE-1553 optical fiber bus network communication method based on time triggering comprises the following steps: the main node broadcasts a time synchronization code to the switch equipment, and the switch equipment and the main node establish a primary time synchronization relationship; the switch equipment establishes a secondary synchronization relationship with each slave node; the FC-AE-1553 bus network divides fixed time slots according to communication requirements under the control of master node network time, and each master node and each slave node carry out data communication in the fixed time slot range; the master node periodically broadcasts time synchronization codes to other nodes of the network according to the scheduling cycle time, and the slave nodes receive the broadcast time synchronization codes of the master node and then perform localization processing to form scheduling cycle synchronization signals consistent with the starting time of the master node scheduling cycle; the transmission time of the main node does not reach the expected time, when the slave node receives the expected time information, the local time code of the slave node does not reach the expected time of the main node broadcast transmission, and the slave node waits until the expected time of the main node broadcast transmission is reached; and when the local time code of the slave node is consistent with the expected time broadcast and transmitted by the master node, triggering to generate a scheduling cycle synchronization signal.
Furthermore, the built FC-AE-1553 network bus architecture adopts a master-slave dual-redundancy network architecture consisting of an NC master control node, an NT acquisition node, an NM monitoring node and HUB equipment.
Further, the FC-AE-1553 network time synchronization method adopts NC and HUB equipment to perform primary synchronization, and the HUB equipment performs secondary synchronization with NT node and NM node.
Further, the FC-AE-1553 network synchronization time presetting method comprises the following steps: the method comprises the steps that the NC device sends network synchronization time to the HUB device, the NT acquisition node and the NM monitoring node in advance, so that the HUB device, the NT acquisition node and the NM monitoring node can obtain the starting time of the next scheduling period of the NC device in advance.
Further, the FC-AE-1553 scheduling time slot division method comprises the following steps: the NC device divides the scheduling period into a plurality of time slot units according to a time division multiplexing method, and the NC access process to the NT is completed in the specified time slot.
Further, the expected time information is a time synchronization code that the master node broadcasts to other nodes of the network periodically according to the scheduling cycle time, and is also a time synchronization code corresponding to the starting time of the next scheduling cycle of the master node.
Further, the scheduling periodic synchronization signal is a starting time of data acquisition and data response of the slave node.
Further, when the slave node judges whether the local time code is consistent with the expected time broadcast by the master node, the slave node performs information matching according to the content of the scheduling instruction, if the matching is successful, the local time code is considered to be consistent with the expected time broadcast by the master node, and sends local data to the bus network, and if the matching is failed, the slave node does not send data to the bus network.
The beneficial technical effects obtained by the invention are as follows:
the method is suitable for FC-AE-1553 bus network communication, in particular to multi-node equipment data acquisition and data scheduling of an FC-AE-1553 bus network of an aerospace vehicle. Based on a time trigger mode, the FC-AE-1553 bus network scheduling period is divided into a plurality of time slot units, so that a data scheduling task is completed, the reliability of data scheduling is improved, and the method can be widely applied to various data transmission fields of military industry and civil use.
Compared with the prior art, the method has the advantages that the scheduling cycle time is preset, unified time planning and time synchronization are increased, the reliability of FC-AE-1553 bus network communication is improved, the FC-AE-1553 bus network communication based on time triggering is realized, the network communication has strong time certainty and real-time performance, and the network performance and the reliability are remarkably improved.
Drawings
FIG. 1 is a schematic diagram of the FC-AE-1553 bus network configuration in accordance with one embodiment;
FIG. 2 is a schematic diagram of FC-AE-1553 bus communication slot division and scheduling cycle synchronization in accordance with one embodiment;
fig. 3 is a block diagram of the high speed communication network operation in accordance with one embodiment.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings and the detailed description. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the invention without making creative efforts, shall fall within the scope of the claimed invention.
An FC-AE-1553 optical fiber bus implementation method comprises an FC-AE-1553 network bus architecture, an FC-AE-1553 network time synchronization method, an FC-AE-1553 network synchronization time preset method and an FC-AE-1553 scheduling time slot division method.
The FC-AE-1553 network bus architecture adopts a master-slave dual-redundancy network architecture consisting of an NC (numerical control) master control node, an NT (network node) acquisition node, an NM monitoring node and HUB (head office) equipment.
The FC-AE-1553 network time synchronization method adopts NC and HUB equipment to carry out primary synchronization, and the HUB equipment carries out secondary synchronization network time synchronization with NT nodes and NM nodes.
The FC-AE-1553 network synchronization time presetting method comprises the step that NC equipment sends network synchronization time to HUB equipment, NT acquisition nodes and NM monitoring nodes in advance, so that the HUB equipment, the NT acquisition nodes and the NM monitoring nodes can obtain the starting time of the next scheduling period of the NC equipment in advance.
The FC-AE-1553 scheduling time slot division method comprises the steps that an NC device divides a scheduling period into a plurality of time slot units according to a time division multiplexing method, and the NC access process to an NT is completed in a specified time slot.
The FC-AE-1553 bus network communication based on time triggering comprises a main node NC, slave nodes NT1 and NT2.. NTm, switch equipment, a scheduling period of the main node, network time synchronization of the main node, the slave nodes NT1 and NT2.. NTm and the switch equipment, local time synchronization codes of the main node, the slave nodes NT1 and NT2.. NTm, and a broadcast local time synchronization code of the main node to the FC-AE-1553 bus network.
A FC-AE-1553 optical bus network communication method based on time triggering adopts the FC-AE-1553 optical fiber bus, and comprises the following contents:
the master node NC broadcasts a time synchronization code to the switch device, the switch device establishes a primary time synchronization relationship with the master node NC, and then the switch device establishes a secondary synchronization relationship with each slave node NT1, nt2.. NTm. The FC-AE-1553 bus network divides fixed time slots according to communication requirements under the control of network time of a main node NC, and each main node NC and each slave node NT1 and NT2. The main node NC broadcasts time synchronization codes to other nodes of the network periodically according to the scheduling cycle time, and NT1 and NT2.
The communication hierarchy is not limited to level 2, and may be expanded when the number of communication nodes is large.
The broadcast time synchronization code sent by the master node NC is a time synchronization code corresponding to the start time of the next scheduling period of the master node NC, and the time synchronization code is expected time information.
When the transmission time of the master node NC does not reach the expected time yet, and the slave nodes NT1 and NT2.. NTm receive the expected time information, the local time codes of the slave nodes NT1 and NT2.. NTm do not reach the expected time of broadcast transmission of the master node NC either.
NTm waits until the expected time of the master node NC broadcast transmission is reached. NTm local time code is consistent with the expected time broadcast by the master node NC, triggering the generation of a scheduling cycle synchronization signal.
The scheduling cycle synchronization signal of the NT1, nt2.. NTm slave nodes is the starting time of data acquisition and data response of the NT1, nt2.. NTm slave nodes.
The following is a specific embodiment of a bus network communication method based on an FC-AE-1553 optical fiber bus architecture, which includes the following contents:
as shown in fig. 1, the master node NC is connected to the switch 1 through a bus a, and the master node NC is connected to the switch 2 through a bus B; the switch 1 is connected with the slave nodes NT1, NT2 and the switch 3 through an A bus; the switch 2 is connected with the slave nodes NT1, NT2 and the switch 4 through a B bus; the switch 3 is connected with the slave nodes NT3 and NT4 through an A bus, and the switch 4 is connected with the slave nodes NT3 and NT4 through a B bus to form a master-slave dual-redundancy network architecture.
As shown in fig. 2, FC-AE-1553 bus communication time period T is divided into N slot units according to communication bandwidth requirements.
The network time synchronization and scheduling period synchronization are shown in fig. 2. Taking time slot 3 as an example, the master node NC broadcasts time information of an expected scheduling period start time in a time slot unit, the switch 1 and the switch 2 respectively forward the broadcast time information to NT1, NT2, the switch 3 and the switch 4 after receiving the broadcast time information, and the switch 3 and the switch 4 forward the broadcast time information to NT3 and NT4 after receiving the broadcast time information. The broadcast time synchronization code sent by the master node NC is a time synchronization code corresponding to the start time of the next scheduling period of the master node NC, and the time synchronization code is expected time information. When the transmission time of the master node NC does not reach the expected time yet, and the slave nodes NT1 and NT2.. NTm receive the expected time information, the local time codes of the slave nodes NT1 and NT2.. NTm do not reach the expected time of broadcast transmission of the master node NC either. NTm waits until the expected time of the master node NC broadcast transmission is reached. NTm local time code is consistent with the expected time broadcast by the master node NC, triggering the generation of a scheduling cycle synchronization signal.
The scheduling cycle synchronization signal of the NT1, nt2.. NTm slave nodes is the starting time of data acquisition and data response of the NT1, nt2.. NTm slave nodes. The NT local scheduling period synchronization signal and the NC local scheduling period synchronization signal can be guaranteed to be consistent in time, and the time error in this embodiment is less than 100ns.
Instruction scheduling and data transmission are shown in FIG. 2. The main node NC sends a scheduling instruction to the switch 1 through the bus A in a fixed time slot unit, the switch 1 forwards the scheduling instruction to NT1, NT2 and the switch 3 after receiving the scheduling instruction, and the switch 3 forwards the scheduling instruction to NT3 and NT4; the main node NC sends a scheduling instruction to the switch 2 through the B bus in the same fixed time slot unit, the switch 2 forwards the scheduling instruction to the NT1, the NT2 and the switch 4 after receiving the scheduling instruction, and the switch 4 forwards the scheduling instruction to the NT3 and the NT4. The scheduling command of the main node NC can reach any device of the FC-AE-1553 bus network. And the NT1, the NT2, the NT3 and the NT4 carry out information matching according to the content of the scheduling instruction, if the matching is successful, the local data is sent to the bus network, and if the matching is failed, the data is not sent to the bus network. The operation of the whole process is shown in fig. 3.
According to the scheme, the FC-AE-1553 bus communication completes instruction scheduling and data communication in N time slots.
The technical scheme provided by the specific embodiment is mainly suitable for FC-AE-1553 bus network communication, in particular to FC-AE-1553 bus network multi-node equipment data acquisition and data scheduling of an aerospace vehicle. Based on a time triggering mode, the scheduling cycle of the FC-AE-1553 bus network is divided into a plurality of time slot units, so that a data scheduling task is completed, the reliability of data scheduling is improved, and the method can be widely applied to various data transmission fields of military industry and civil use.
Compared with the prior art, the method has the advantages that the scheduling cycle time is preset, unified time planning and time synchronization are added, the high reliability requirement of FC-AE-1553 bus network communication can be met, the FC-AE-1553 bus network communication based on time triggering is realized, the network communication has strong time certainty and real-time performance, and the network performance and reliability are remarkably improved. .
Claims (4)
1. A bus network communication method based on FC-AE-1553 optical fiber bus architecture is characterized by comprising an FC-AE-1553 optical fiber bus architecture implementation method and an FC-AE-1553 optical fiber bus network communication method based on time triggering;
the FC-AE-1553 optical fiber bus architecture implementation method comprises the following steps:
building an FC-AE-1553 network bus architecture, determining an FC-AE-1553 network time synchronization method, determining an FC-AE-1553 network synchronization time preset method and determining an FC-AE-1553 scheduling time slot division method;
the FC-AE-1553 network time synchronization method adopts NC and HUB equipment to carry out primary synchronization, and the HUB equipment carries out secondary synchronization network time synchronization with NT nodes and NM nodes;
the FC-AE-1553 network synchronization time presetting method comprises the following steps: the method comprises the steps that the NC equipment sends network synchronization time to the HUB equipment, the NT acquisition node and the NM monitoring node in advance, so that the HUB equipment, the NT acquisition node and the NM monitoring node can obtain the starting time of the next scheduling cycle of the NC equipment in advance;
the FC-AE-1553 scheduling time slot dividing method comprises the following steps: the NC device divides the scheduling period into a plurality of time slot units according to a time division multiplexing method, and the NC access process to the NT is completed in the specified time slot;
the FC-AE-1553 optical fiber bus network communication method based on time triggering comprises the following steps:
the main node broadcasts a time synchronization code to the switch equipment, and the switch equipment and the main node establish a primary time synchronization relationship;
the switch equipment establishes a secondary synchronization relationship with each slave node;
under the control of the network time of the main nodes, the FC-AE-1553 bus network divides fixed time slots according to communication requirements, and each main node and each slave node carry out data communication in the fixed time slot range;
the master node periodically broadcasts time synchronization codes to other nodes of the network according to the scheduling cycle time, and the slave nodes receive the broadcast time synchronization codes of the master node and then perform localization processing to form scheduling cycle synchronization signals consistent with the starting time of the master node scheduling cycle;
the transmission time of the main node does not reach the expected time, when the slave node receives the expected time information, the local time code of the slave node does not reach the expected time of the broadcast transmission of the main node, and the slave node waits until the expected time of the broadcast transmission of the main node is reached;
and when the local time code of the slave node is consistent with the expected time broadcast and transmitted by the master node, triggering to generate a scheduling cycle synchronization signal.
2. The bus network communication method according to claim 1, wherein: the expected time information is a time synchronization code periodically broadcasted to other nodes of the network by the master node according to the scheduling cycle time, and is also a time synchronization code corresponding to the starting time of the next scheduling cycle of the master node.
3. The bus network communication method according to claim 2, wherein: the scheduling cycle synchronization signal is the starting time of data acquisition and data response of the slave node.
4. A bus network communication method according to claim 3, characterized in that: and when the slave node judges whether the local time code is consistent with the expected time broadcast by the master node, the slave node performs information matching according to the content of the scheduling instruction, if the matching is successful, the local time code is considered to be consistent with the expected time broadcast by the master node, and sends local data to the bus network, and if the matching is failed, the slave node does not send data to the bus network.
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