CN112532295A - Reconfigurable satellite-borne information network construction method based on special link information node - Google Patents
Reconfigurable satellite-borne information network construction method based on special link information node Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
- H04B7/18584—Arrangements for data networking, i.e. for data packet routing, for congestion control
Abstract
A reconfigurable satellite-borne information network construction method based on a special link information node utilizes a SpaceWire router to control a module unit, and all the module units communicate with each other through the SpaceWire router. The module unit route does not divide master and slave nodes, and is suitable for constructing a variable topology satellite-borne information network; a special port of a SpaceWire routing chip is designated as an internal node and is specially responsible for information acquisition of the router, so that complexity of realizing an expansion function based on a Spw routing physical address 0 is avoided. The invention solves the problems of any dynamic interconnection among different functional module units, mutual perception among multiple routers, realization of a SpaceWire bus based routing architecture project and the like, and meets the requirements of free butt joint, free expansion, real-time dynamic construction of an information network and the like among any functional module units when a reconfigurable satellite on-orbit module is assembled and reconfigured.
Description
Technical Field
The invention belongs to the technical field of satellite communication, and relates to a network link information acquisition and information network construction method based on a SpaceWire router special link information node, which is suitable for network design of a reconfigurable satellite information system.
Background
In order to meet the task requirements of novel spacecraft on-orbit maintenance, scale expansion, on-orbit function reconstruction and the like, a novel concept of spacecraft design and on-orbit construction based on modularization and interface standardization, batch launching and on-orbit assembly is provided, and the spacecraft is called as a modularized reconfigurable spacecraft and can meet the development requirements of ultra-large-scale and ultra-high-performance spacecraft in the future. The spacecraft is required to have an open electrical system architecture, can support plug and play of functional equipment, and provides new challenges for flexible reconfigurability of the information system architecture and dynamic real-time construction capability of an information link.
And aiming at the on-orbit reconfigurable requirement of the satellite-borne equipment, an information network of each terminal equipment is required to be dynamically constructed according to the on-satellite task planning. Considering that the module units have relatively stable physical connection inside, and the connection among the module units is variable, the SpaceWire protocol is adopted to construct an information network. A SpaceWire router controls a unit module, and communication between the units is actually connection between the SpaceWire routers. In order to be adaptive to application scenarios, a plurality of SpaceWire routers need to be capable of mutually perceiving the connection relationship among the routers.
The main defects of the traditional satellite-borne information network construction method and the plug-and-play network topology construction technology based on SpaceWire are as follows:
1) each terminal device of the traditional satellite is usually fixed, a satellite-borne network information topological structure is fixed, a SpaceWire router information network dynamic construction technology is used, in order to realize plug and play, a main control node is adopted, a specific main node is used as a core to construct a network, network connection is connected in a specific mode, and the topological structure and connected devices in the network are found through a network traversal algorithm; when the number of nodes in the network is given, the master control node determines whether the port is connected with equipment or not by adopting a timing and response waiting mode for the ports of all routers, and for networks containing the same number of nodes, network traversal time consumption is different due to different network topologies, and the flexibility in use is poor. In the reconfigurable satellite-borne equipment, each node in each router is relatively stable, but the routers of different module units have no master and slave, and real-time dynamic interconnection among different module units is expected, and the traditional network topology construction mode with fixed topology structure and incapable of supporting plug and play obviously cannot meet the requirements.
2) Based on a SpaceWire router information network dynamic construction technology, a physical address 0 of a router is generally configured to be a routing information acquisition node, the basic function of the router is to configure a logical address of the router, and the conventional design is to integrate a router information acquisition function to the routing node, so that the scheme is simple in structure, but the SpaceWire router is generally realized by adopting an integrated chip (AT7910), and the chip cannot increase the information acquisition function on a port of the physical address 0 and cannot meet the requirement.
Disclosure of Invention
The technical problem solved by the invention is as follows: the method overcomes the defects of the prior art, provides a reconfigurable satellite-borne information network construction method based on a special link information node, solves the problems of random dynamic interconnection among different functional module units, mutual perception among multiple routers, realization of a SpaceWire bus-based routing architecture project and the like, and meets the requirements of free butt joint, free expansion, real-time dynamic construction of an information network and the like among any functional module units when a reconfigurable satellite on-orbit module is assembled and reconfigured.
The technical solution of the invention is as follows: the method for constructing the reconfigurable satellite-borne information network based on the special link information node comprises the following steps:
(1) configuring an SpW route for each satellite function module, wherein each SpW route is provided with a special route information acquisition node which is responsible for collecting connection information around the SpW route;
(2) establishing physical connections among SpW routers and between the SpW routers and corresponding satellite function modules according to the interface types of the SpW routers to form a reconfigurable satellite-borne information network physical topology, and selecting a port on the whole network as a PC (personal computer) control terminal;
(3) sending a self-checking instruction through a PC control end, receiving the self-checking instruction by each special routing information acquisition node, then directly transmitting the self-checking instruction to an adjacent special routing information acquisition node on one hand, and collecting link information of the SpW route and feeding the link information back to each physical port of the SpW route and simultaneously transmitting the link information to the adjacent special routing information acquisition node on the other hand;
(4) when each special routing information acquisition node receives link information sent by other special routing information acquisition nodes, if the link information is not forwarded, the link information is forwarded to each physical port of the SpW route and the adjacent special routing information acquisition nodes;
(5) after the PC control end collects the link information of each SpW route, calculating the shortest path between two physical ports as the optimal communication link between the two physical ports;
(6) the PC configures the logic address of each SpW route according to the optimal communication link to form a routing table of the whole satellite borne information network so as to realize the dynamic configuration of the satellite borne information network;
(7) and (5) repeating the steps (3) to (6) to realize the dynamic update of the satellite-borne information network.
Compared with the prior art, the invention has the advantages that:
1) the invention provides a plug-and-play information network construction method based on a SpaceWire router, wherein one SpaceWire router controls one module unit, and all the module units are communicated through the SpaceWire router. The module unit routing does not divide master and slave nodes, is suitable for variable topology satellite-borne information network construction, and can support dynamic interconnection among reconfigurable satellite module units.
2) The invention provides a bus router architecture design based on a special information acquisition node of a router, which is specially responsible for router information acquisition by designating a special port of a SpaceWire routing chip as an internal node, thereby avoiding the complexity of realizing the function of expanding a physical address 0 based on a Spw route.
Drawings
FIG. 1 is a schematic diagram of arbitrary dynamic connection of modular units oriented to on-orbit reconfiguration tasks;
FIG. 2 is a schematic diagram of a system connection relationship of a dedicated link information acquisition node according to the present invention;
FIG. 3 is a schematic diagram illustrating a node definition of a dedicated link information collection node of a router according to the present invention;
FIG. 4 is a diagram of the neighboring routing connection and dedicated message transmission path according to the present invention;
FIG. 5 is a schematic diagram of the internal structure of the dedicated link information module according to the present invention;
FIG. 6 is a schematic diagram of the topology of the entire SpW route according to the present invention;
FIG. 7 is a flow chart of the dedicated routing information processing of the present invention;
FIG. 8 is a schematic diagram illustrating self-test command forwarding according to the present invention;
FIG. 9 is a schematic diagram of query instruction delivery according to the present invention;
FIG. 10 is a schematic diagram illustrating query feedback command transmission according to the present invention;
FIG. 11 is a flow chart of link information sending and forwarding according to the present invention;
fig. 12 is an information interaction process of different routing information collection nodes according to the present invention.
Detailed Description
The method of the present invention will be described in further detail with reference to the accompanying drawings.
The method mainly comprises the following steps: reconfigurable physical node and connection relation design, link establishment instruction design and routing information processing flow, link information collection and dynamic routing table establishment and the like. Several key elements are described below.
1. Physical node and connection relation design
The requirement that the modules respectively comprise various specific functions and the interconnection topology among the modules is randomly variable can be met, and the flexible assembly and reconstruction requirements are met.
(1) Designing standardized interfaces that support arbitrary docking
In a reconfigurable on-board plant system, each part of the system is composed of modules, each module contains each specific function, and the modules are arbitrarily combined, so that the topology among the modules is variable, as shown in fig. 1.
In order to realize any combination among all the module units, a standardized information interconnection interface of the module units is defined. As shown in fig. 2, a reconfigurable physical topology of the information network can be formed by configuring 1 SpW route for each module unit, each route being provided with a dedicated route information collection node and being responsible for collecting connection information around the route, and configuring a PC control terminal (a PC in fig. 2, which is a control computer used for calculating an optimal transmission path of an information link in the system and configuring a logical address configuration table of each router in the system) for any module unit at any port of the entire network.
A connection between any two SpW routers. The router designed and implemented is an SpW router including four interfaces: SpW bus interface, serial port (232 protocol or 422 protocol), optical communication interface and hundred mega network interface. The connection line between two routers can communicate as long as the interface protocols are the same, such as: if the optical communication interface of the a route (physical port i for the router module) is connected with the optical communication interface of the B route (physical port m for the router module) by using the physical path of optical communication, a physical connection is established between the a and B routes, at this time, the a route has a router B on the physical port i (1< i <32) and the B route has a router a on the physical port m (1< m < 32). For another example, if the portal interface (physical port j) of the route a and the portal interface (physical port n) of the route B are connected by network cables, A, B also establish a physical connection, at this time, for the route a, there is a router B on the physical port j (1< j <32), and for the route B, there is a router a on the physical port n (1< n < 32).
Besides being connected with each other, the interfaces of the router are also connected with other functional modules of the router, such as a temperature information acquisition module, an execution mechanism module, an instruction computer module and the like. The internal connection mainly adopts UART 422 bus interface type.
(2) Designing special link message processing module based on separation structure
The physical ports supported by the SpaceWire router module are 32, wherein the port with the physical address number 0 is a configuration port reserved for the router, and the physical port cannot be externally used and cannot be directly added with the information acquisition function of the router. As shown in fig. 3, the present invention proposes to extend externally on the original SpW routing core module, borrow an original SpW interface as an internal node, and use a dedicated message processing separation structure to be specially responsible for router information acquisition. The special message processing separation structure integrates a special link information module and an SpW coding and decoding module on an FPGA, and is matched with a corresponding interface chip to construct a special link information processing board. The module occupies a physical port 1 of the SpW router, and the remaining 30 ports are ports to which other routers or functional modules can be connected.
The dedicated link information module is a functional module mounted on port 1 of the SpW router, and its main function is 1) to sense the connection information between the local router and the adjacent router (including: the serial number of the local router, the physical port connected to the external router, the serial number of the connected router, and the physical port on the connected router used for interconnecting with the local router). 2) In order to broadcast the link information to each port in the network system, the special link information module also has the functions of generating and sending local link information instructions and forwarding other router link information instructions.
(3) Adjacent routing connection and routing of dedicated messages
The connection relationship and the message passing path between two adjacent routers are shown in fig. 4, and the passing process is as follows: the dedicated message processing node of SpW route a transmits and receives messages through route interface 1 of SpW route a, through the interior of route a to route interface i of route a, then through route interface m of SpW route B to route interface 1 of SpW route B, and finally to the dedicated message processing node of SpW route B.
(4) Internal physical design of special link information module
The special link information module is realized by adopting a Hardware Description Language (HDL) design based on an FPGA chip, and a block diagram of main sub-modules of the design is shown in FIG. 5. The main sub-modules include:
1) and receiving a data cache. A9-bit parallel data FIFO structure buffer with the depth of 2048 is designed by adopting an asynchronous clock FIFO structure, the input clock of the buffer is 10M clock, and the output is 50M clock. The buffer input data is data sent by the port 1 of the SpW router, the input clock is a synchronous clock of the routing data, and the output clock is a high-frequency internal processing clock. The module has the main function of balancing different speeds of routing data sending and receiving data processing, and solves the problem of data transmission between the two different clock domains.
2) And receiving data analysis. In the received 9-bit parallel data, 8 bits are valid data, and one packet with flag bits (SpW) is encapsulated by 8-bit data + 8-bit end word as structure, and in the route-switched data, the data is converted into 9 bits, the highest bit is 0 indicating that the lower 8 bits are data, and the highest bit is 1 indicating that the byte is end word), according to the difference of the flag bits, the continuously received parallel data is segmented into different instructions (in the received 8-bit data, the data can be decomposed into data length (1 byte, indicating the byte number of the subsequent valid data) + physical address of the receiving end (1 byte) + information type identification code (2 byte fixed value: 0xD7, 0x 48) + instruction code (1 byte), 0xE7 represents self-check instruction, 0x55 represents query instruction, 0xAA represents query feedback instruction, and 0xF9 represents link information instruction content (length different)).
Firstly, comparing the value of the received data length byte with the actually received byte length, if the length is incorrect, judging the received instruction as an invalid instruction, and directly discarding the invalid instruction; secondly, judging whether the received information type identification code and the instruction code are correct or not, if not, judging the received instruction to be an invalid instruction, and directly discarding the invalid instruction; and if the data length, the information type identification code and the instruction code are correct, sending the extracted instruction information to subsequent logic flow control and current state cache.
3) And (4) data reading control. The module generates control signals that receive an asynchronous clock FIFO in the data buffer. At an input port of the FIFO, a control signal sent to the FIFO comprises a data write clock signal wr _ clk, a write enable signal wr _ en and a data full mark in _ full of information received from the FIFO; at the output port of the FIFO, the control signals sent to the FIFO include a data read clock signal rd _ clk, a read enable signal wr _ en, and the information received from the FIFO includes a data empty flag out _ empty.
Meanwhile, the module and the logic flow control module interact with each other according to the following information: and receiving a read permission data signal, configured _ ctl, of the logic flow control module. When a FIFO data input control signal is generated after a FIFO _ ctl instruction from the logic flow control module is received, the data read control module always generates the FIFO data input control signal, ensuring that the FIFO can always receive data.
4) And controlling the logic flow. The module is a core part of a special link information module and determines the starting operation time of a logic flow, the time of receiving and sending instructions, the forwarding of detection instructions, the acquisition and feedback of router link information, the judgment of information feedback completion, the construction of link information instructions, the forwarding of link information, the access of a PC (personal computer) and the link control.
The logic flow control module receives the information of the received data analysis module, and the information comprises the following information: newly receiving an instruction analysis completion mark int _ receive, receiving an instruction type mark int _ receive _ type, and receiving instruction information din. The logic flow control module receives the information of the current state cache module as follows: and receiving the cache data din _ lock stored in the data register.
The information sent by the logic flow control module to the data reading control module is: allowing the data signal configured _ ctl to be read. The information sent by the logic flow control module to the data sending control module is: the data signal ram _ wctl is allowed to be written. The information sent by the logic flow control module to the sending instruction generation module is: sending an instruction interrupt int _ all, sending an instruction type _ send, and sending a data length Num _ send.
5) And caching the current state. The sub-module is used for caching the current state, such as the state of a received self-checking instruction, the received link information of a certain route and the like, so that the comparison between the logic flow control module and the state of a newly received instruction is facilitated, the processing is further performed, or the instruction generation by the instruction sending generation module is facilitated. The information obtained by the current state cache module from the received data analysis module mainly comprises: newly receiving an instruction analysis completion mark int _ receive, receiving an instruction type mark int _ receive _ type, and receiving instruction information din. The information interaction between the current state cache module and the logic flow control module is realized by a register storage structure, the current state cache module stores cache information required by different instructions in a special register, and the logic flow control module directly reads the special register according to the requirement.
6) And generating a sending instruction. The module regenerates a new instruction according to the requirement of the logic flow control module and sends the generated instruction to the sending data caching module.
The information sent by the logic flow control module to the sending instruction generation module is: sending an instruction interrupt int _ all, sending an instruction type _ send, and sending a data length Num _ send. When receiving a sending instruction interrupt int _ all, the sending instruction generation module reconstructs an output instruction according to a sending instruction type _ send (a self-checking instruction, a query feedback instruction and a link information instruction). The output of the transmission instruction generation module is the generated instruction register out _ reg, and the transmission data cache module can read the register when needed.
7) And sending the data buffer. An asynchronous clock double-end RAM structure is designed, an input clock is a 50M clock, and an output clock is a 10M clock.
The RAM input data is an instruction register out _ reg output by the transmission instruction generation module, and the input clock is a data processing internal clock. The output of the RAM is directly connected with the port 1 of the SpW router, and the output clock is a synchronous clock of routing data. The module has the main function of balancing different speeds of data sending and routing receiving data processing, and solves the problem of data transmission between the two different clock domains.
8) And controlling data transmission. The module generates control signals for the dual-port RAM. The information interacting with the sending data cache module includes a write-in clock clka, a read clock clkb, a write-in enable ena, a read enable enb, a write-in address addra, a read address addrb, a write-in data dina, and a read data. The information of the interaction between the data sending control module and the logic flow control module comprises the following information: and receiving a write-enabled data signal ram _ wctl of the logic control flow module.
(5) Topology structure of SpW route of whole system
The connection relationship between the SpW routers of the entire system is a mesh relationship of arbitrary connections.
Any two spws can be connected as long as the interface protocols are consistent, and the routing network of the whole system is schematically shown in fig. 6.
2. Link establishment instruction design and routing information processing flow
(1) Link building instruction design
In order to construct an information network, information interaction mechanisms among different routes and instruction information packets accessed mutually are designed, broadcasting and information interaction transmission are carried out in a message mode, and acquisition of mutual topological relations of routers, information transmission and information forwarding are achieved.
Four types of instructions are designed for the dedicated message processing node to process information according to the task of each routing node. And the PC end and the router perform interactive access by adopting a self-checking instruction, a query feedback instruction and a link information instruction.
The interactive command packet is defined as follows:
1) and (4) self-checking instruction: the method comprises the steps of sending end physical address + data length + receiving end physical address + information type identification code + self-checking instruction code (0xE7) + self-checking instruction times + self-checking instruction sequence number + end identification.
The self-checking instruction is firstly sent to the special link information module on the same router by the only PC in the system, and is forwarded to the special link information module on the adjacent router by the special link information module, and the self-checking instruction is broadcast to the special link information modules on all the routers by adopting the mode of forwarding step by step. When the special link information module receives the self-checking instruction, the special link information module starts to inquire the link information of the route, and broadcasts (in a step-by-step forwarding mode) the link information of the route after collection.
2) Query/query feedback instructions: a query instruction, namely a sending end physical address, a data length, a receiving end physical address, an information type identification code, a query instruction code (0x55), query instruction times, a query instruction sequence number and an end identification; and inquiring a feedback instruction, namely a sending end physical address, a data length, a receiving end physical address, an information type identification code, an inquiring feedback instruction code (0xAA), inquiring feedback instruction times, an inquiring feedback instruction sequence number and an ending identification.
The query is the information that the dedicated link information module sends to the 2-31 physical ports of the present route (here assumed to be router a). If a port (assumed to be 2 ports) of the router (router a) is connected to another router (assumed to be router B), a query is sent to the dedicated link information module of router B. At this time, the dedicated link information module of the router B sends an inquiry feedback instruction to the dedicated link information module of the router a. In this manner, router a can determine that router B is connected on port 2.
3) The link information instruction: the method comprises the steps of sending end physical address + data length + receiving end physical address + information type identification code + link information instruction code (0xF9) + local routing identification + link information instruction sequence number + link information 1+ link information 2+ … … + link information n + end identification. Wherein the link information consists of three bytes: interface physical address connected with the external of the local machine + route identification connected with the external route + interface physical address connected with the local machine on the external route.
When the special link information module finishes the collection of the query feedback instructions on the 2-32 ports (a certain port does not receive the query feedback instructions within a certain time, the port is not connected with other routers, and if the query feedback instructions are received, the information of the port connected with the router is recorded), the special link information module sends the link information instruction of the route to the special link information module of the adjacent route. The adjacent route forwards the link information instruction, and the route link information instruction is broadcast to each port in the whole network system after being forwarded step by step. In the whole network, after the PC sends a self-check command, the PC finally receives link information commands (a number of which is equal to the number of routers) of each router.
(2) Information processing flow design of special link information node
As shown in fig. 7, the processing of information by the dedicated link information node includes two parallel flows, and the following description is provided:
1) first procedure (left side of fig. 7): the flow of receiving self-checking instruction, forwarding self-checking, inquiring and sending link information facing the special node. After the dedicated link information module receives the self-checking instruction, whether the instruction is transmitted or not needs to be judged through two bytes (self-checking instruction times and self-checking instruction serial number) in the self-checking instruction, and if the instruction is received, the instruction is not sent; if the self-checking instruction is a new self-checking instruction, starting a subsequent link information acquisition and release process of the local router; after the link information acquisition process is started, the dedicated link message processing node successively sends query instructions from the port 1 to other ports (2-31 ports) of the local route, and the query instruction of each port comprises the unique identifier and the port identifier of the router.
The special link information module is mounted on a port 1 of the SpW route, and when the first byte of information sent to the SpW route by the special link information module is a certain physical port number (between 2 and 31, assuming 2 ports), the information is forwarded to the physical port (2 port) through the SpW route. If a certain physical port (set as 2 ports) of the router (set as router A) is physically connected with a certain physical port (set as 3 ports) of an adjacent router (set as router B), the query instruction is generated by a special link information module of the router A, passes through the 1 port of the router A, is forwarded through data inside the router A, is output from the 2 port of the router A, passes through the 3 port of the router B, enters the inside of the router B for forwarding, and finally reaches the special link information module of the router B through the 1 port of the router B. After receiving the query instruction, the dedicated link information module of the router B generates a query feedback instruction, where the feedback information includes information of the neighboring router and its port. The feedback instruction reaches the special link information module of the router A through the port 1 of the router B, the interior of the router B, the port 3 of the router B, the port 2 of the router A, the interior of the router A and the port 1 of the router A in sequence. In the flow shown in fig. 7, the dedicated link information module needs to poll each port (2-31 ports) to determine whether there is query feedback information.
When the dedicated link message processing module finishes collecting the information fed back by each port, a link message instruction of the local router is constructed, and the local link message is sent to other ports of the router. After the special link information module constructs a link information instruction of the local router, the link information instruction is sent to each port (2-31 ports) of the router. If a port is connected with other routers, the link information command is forwarded by the dedicated link information module on the connected router, and the processing flow of this forwarding is the flow on the right side of fig. 7.
2) Second scheme (right side of fig. 7): and forwarding information instructions of other routes to the special link information node. And taking the received link information instruction of other routers as a reference, when the link information instruction sent by other routers is received, if the instruction is not forwarded, forwarding the link information to other ports of the router. The link information is sent to each route in the network, and when each route receives repeated link information, the information is stopped being sent.
In the first flow, the special link information module forwards the generated link information to the 2-31 ports through the router. This instruction needs to be broadcast to the various ports of each router throughout the network system. To achieve this, other routes that receive this link information instruction need to be forwarded again. The specific process is as follows: the special link information module of one router receives a link information instruction sent by the special link information module of an adjacent router (the information is generated by the special link information module of one adjacent router and passes through the port 1 of the adjacent router, the internal forwarding of the adjacent router, the port connected between two routers, the internal forwarding of a local router and the local special link information module reached by the port 1 of the local router), and judges whether the instruction needs to be forwarded (if the instruction is not the link information instruction of the local router, and the instruction is not sent after the self-checking instruction, the instruction can be forwarded). The forwarded link information instruction is internally forwarded to the ports 2-31 through the router through the port 1, and if a certain port is connected with another router, the forwarded link information instruction is further forwarded to a mounted special link information module through the inside of the other router.
Each dedicated link information module has two data processing flows of fig. 7, and each dedicated link information module is responsible for two tasks of constructing a link information instruction of a local router and forwarding a link information instruction of other routers. The first flow is a process of constructing and sending a link information instruction of a local router, wherein the process takes a self-checking instruction as a starting condition, and after receiving the self-checking instruction, the link information instruction is finally sent to the ports 2-31 through the router after being inquired. The second process takes the received link information instruction of one other route as the starting condition, and finally forwards the link information instruction of the other route to the ports 2-31 through the router under the required condition after the judgment and confirmation.
Fig. 8 to fig. 11 respectively show a self-checking instruction, a query feedback instruction, and a link information sending and forwarding flow chart according to the present invention.
In fig. 8, the dotted line indicates the command transmission/reception data flow. The main steps of sending the self-test instruction in the figure are as follows: 1) a PC machine serving as an external node sends a self-checking instruction 1 to an internal special link information module of the router 1; 2) an internal special link information module of the router 1 sends a self-checking starting instruction 2 to other physical addresses (2-31 ports) through internal forwarding of the router; at the moment, adding 1 to the self-checking instruction serial number; 3) the PC node and other nodes connected with the router 1 do not feed back instructions; 4) after receiving the self-checking instruction, the internal dedicated link information node of the router 2 continues to forward the self-checking instruction.
In fig. 9, after receiving the self-check instruction, the dedicated link information module of the router 1 generates an inquiry instruction, and sends the inquiry instruction to each physical address (2-31 ports) via the internal forwarding of the router.
In fig. 10, there are two sources for the query feedback command for router 1, which are the dedicated link information modules of PC and router 2. The inquiry feedback instruction sent by the PC reaches a special link information module of the router 1 through a port connected with the router 1, the forwarding of the router 1 and the port 1 of the router; the special link information module of the router 2 generates an inquiry feedback instruction, and the inquiry feedback instruction is forwarded through the port 1 of the router 2, the connection port between the two routers, the forwarding of the router 1 and the port 1 of the router 1 finally reaches the special link information module of the router 1.
In fig. 11, the link information module dedicated to the router 1 constructs a link information command according to the received query feedback information, and forwards the link information command to each physical port (2-31) through the port 1 and the router. When the special link information module of the router 1 receives the link information instruction sent by the special link information module of other routers and does not forward the instruction, the special link information module forwards the link information instruction to each physical port (2-31).
3. Link information collection and system dynamic route construction
This section mainly describes the role of the PC in the network system, and through these descriptions, the interaction of the dedicated link information module with the PC is known from the system level. The special link information module is mainly used for generating and forwarding link information of a single router, and the PC is used for starting a process and collecting and using all link information.
(1) Link information collection and routing data table construction
In the whole network system, a plurality of routers and a PC are arranged. The main functions of the PC are: firstly, self-checking is initiated, the collection of link information is not timed, but is started after a PC sends an instruction, and after receiving the self-checking instruction, a special link information module of each router acquires feedback through inquiry to generate a link information instruction. And secondly, collecting link information commands of each router in the network system. In the collecting process, the PC passively receives link information instructions of each route, a special link information module of each router has a forwarding function of the link information instructions, each port in the network system can receive the link information instructions of all the routes through the function, and the PC is connected to one port of a certain route in the network system to obtain the information. And thirdly, after the PC collects the link information instruction of each route (judging through time, if the route is overtime, the route is not available), calculating the actual path of each optimized information link. In the system network, a plurality of communication links can be realized, and the PC calculates the shortest path when two devices communicate. For example, device a on the 4 port of router 1 is to communicate with device B on the 6 port of router 3, and there is a link interconnection between router 1, router 2, and router 3, so that the computer should connect device a to device B via router 1 and router 3, but not via router 2. Fourthly, after the PC calculates the optimal path, the PC needs to configure a logic address list of each router according to the optimal path. This configuration is achieved by the PC writing an SpW logical address table to port 0 (routing configuration port) of each router. Initiating, by a computer, collection of routing information; after receiving the link information instruction of each router, the PC calculates the shortest path from the PC to the router according to the link direction information packet (containing equipment information, namely a terminal, corresponding to a SpaceWire physical port) of the router and calculates a path address list from the PC to a certain router by combining a neighbor list in the link information of the router; the PC sends configuration instructions to each effective port of the router through the path address, and configures the SpW logic address of the router to form a routing table of the whole information network, thereby realizing the dynamic configuration of the network.
Taking an information network formed by 2 routers and 1 PC as an example, the process of collecting routing information is shown in fig. 12. In the process, the PC initiates a link acquisition process through a self-checking instruction, each router acquires own link information through a query instruction, and the PC sequentially receives the link information of each router.
(2) Routing data table updates
After receiving a link direction information packet of a certain router, the PC adds the information of the router into a router data table; if the same router information exists in the current router data table, deleting the original router information and updating the original router information into the latest router information; the neighbor list information of the router changes according to the change of the connection relationship between the router and the neighbor, and the connection relationship between the router interfaces is periodically judged and updated.
According to the requirement, every time the PC sends a self-test instruction, the latest routing information instruction of each route can be collected, so that the link relation in the system is further updated.
The invention has been verified in the modular reconfigurable spacecraft minimum test system through ground assembly of different module units and a reconfiguration desktop joint test, and the test result shows that the dynamic route construction logic based on the method is feasible, the algorithm can be realized, and the method has engineering practicability.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (8)
1. The method for constructing the reconfigurable satellite-borne information network based on the special link information node is characterized by comprising the following steps of:
(1) configuring an SpW route for each satellite function module, wherein each SpW route is provided with a special route information acquisition node which is responsible for collecting connection information around the SpW route;
(2) establishing physical connections among SpW routers and between the SpW routers and corresponding satellite function modules according to the interface types of the SpW routers to form a reconfigurable satellite-borne information network physical topology, and selecting a port on the whole network as a PC (personal computer) control terminal;
(3) sending a self-checking instruction through a PC control end, receiving the self-checking instruction by each special routing information acquisition node, then directly transmitting the self-checking instruction to an adjacent special routing information acquisition node on one hand, and collecting link information of the SpW route and feeding the link information back to each physical port of the SpW route and simultaneously transmitting the link information to the adjacent special routing information acquisition node on the other hand;
(4) when each special routing information acquisition node receives link information sent by other special routing information acquisition nodes, if the link information is not forwarded, the link information is forwarded to each physical port of the SpW route and the adjacent special routing information acquisition nodes;
(5) after the PC control end collects the link information of each SpW route, calculating the shortest path between two physical ports as the optimal communication link between the two physical ports;
(6) the PC configures the logic address of each SpW route according to the optimal communication link to form a routing table of the whole satellite borne information network so as to realize the dynamic configuration of the satellite borne information network;
(7) and (5) repeating the steps (3) to (6) to realize the dynamic update of the satellite-borne information network.
2. The method for constructing the reconfigurable spaceborne information network based on the special link information node according to claim 1, is characterized in that: the interface types of the SpW route comprise a SpW bus interface, a serial port adopting a 232 protocol or a 422 protocol, an optical communication interface and a hundred-megabyte network port.
3. The method for constructing the reconfigurable spaceborne information network based on the special link information node according to claim 1, is characterized in that: the special routing information acquisition node is arranged at the port No. 1 of the physical address of the SpW route.
4. The method for constructing the reconfigurable spaceborne information network based on the special link information node as claimed in claim 3, wherein: the special routing information acquisition node is connected with a special link information processing board, the special link information processing board comprises an interface chip, an SpW coding and decoding module and a special link information module, and the special link information module is used for sensing the connection information of the local SpW router and the adjacent SpW router, forming and sending the link information of the local SpW router and forwarding the link information of other SpW routers.
5. The method for constructing the reconfigurable spaceborne information network based on the special link information node according to claim 1, is characterized in that: the self-checking instruction format is as follows: the method comprises the steps of sending end physical address + data length + receiving end physical address + information type identification code + self-checking instruction times + self-checking instruction sequence number + end identification.
6. The method for constructing the reconfigurable spaceborne information network based on the special link information node according to claim 1, is characterized in that: after receiving the self-checking instruction, the special routing information collection node collects link information of the SpW route, specifically: the special routing information acquisition node sends a query instruction to 2-31 physical ports of the SpW router, and each physical port replies a query feedback instruction; if one of the 2-31 physical ports is connected with another SpW router, the query instruction is sent to the special routing information acquisition node of the another SpW router, and the special routing information acquisition node of the another SpW router sends a query feedback instruction.
7. The method for constructing the reconfigurable spaceborne information network based on the special link information node according to claim 1, is characterized in that: the link information includes three bytes: interface physical address connected with the external of the local machine + route identification connected with the external route + interface physical address connected with the local machine on the external route.
8. The method for constructing the reconfigurable spaceborne information network based on the special link information node according to claim 1, is characterized in that: and the PC configures the logical address of each SpW router according to the optimal communication link, and is realized by writing an SpW logical address table into a physical port 0 of each SpW router through the PC.
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