664 network message construction algorithm

Abstract

The invention discloses a 664 network message construction algorithm, which comprises the following three steps of: determining the basis of a message algorithm, performing macro definition and valuecalculation thereof, and performing MESSAGE supplementary construction caused by DP deletion, modification and increment. The MESSAGE algorithm based determination comprises two-layer classification of DP in the same APP, internal construction of DS and internal DS classification of Message; the macro definition and value calculation comprises setting of main parameters and macro definitions, determination of a limiting relation satisfied between the macro definitions, and calculation of macro definition values; MESSAGE supplementary construction caused by DP deletion, modification and increment comprises determination of algorithm design limiting conditions, determination of a processing method of a deletion module, determination of a processing method of a modification module, determination of a processing method of an increment module and determination of a relationship among the three modules; the Message internal DS classification includes a simple and optimized filling method. According to the invention, various choices can be provided, the bandwidth utilization rate is higher, fewer switches are needed, the network delay is lower, the jitter is lower, the network determinacyis stronger, and the 664 network physical structure setting requirement applied to airplanes is fully met.

Description

technical field [0001] The invention relates to the technical field of algorithm application, in particular to a 664 network message construction algorithm. Background technique [0002] The physical structure of the ARINC664 (aviation electronics full-duplex communication Ethernet, hereinafter referred to as 664 network) avionics backbone network used in the existing aircraft is manually set, and has not been carefully optimized by the algorithm. Its disadvantages are as follows: 1. Manually setting up the physical structure is only a simple estimation without careful calculation of the algorithm, and this estimation is basically an estimation of the number of interfaces, and lacks an estimation of the internal bandwidth of the interface; in the actual development process of the avionics system In the process, the bandwidth is likely to be insufficient, so the physical structure needs to be reconfigured; the reconfiguration of the structure according to the airworthiness ce...

AI Technical Summary

Problems solved by technology

[0002] The physical structure of the ARINC664 (aviation electronics full-duplex communication Ethernet, hereinafter referred to as 664 network) avionics backbone network applied on the existing aircraft is manually set, and has not been carefully optimized by the algorithm

Its disadvantages are as follows: 1. Manually setting up the physical structure is only a simple estimation without careful calculation of the algorithm, and this estimation is basically an estimation of the number of interfaces, and lacks an estimation of the internal bandwidth of the interface; in the actual development process of the avionics system In the process, the bandwidth is likely to be insufficient, so the physical structure needs to be reconfigured; the reconfiguration of the structure according to the airworthiness certification process will lead to high costs, so in order to avoid resetting the structure, the vacant bandwidth space has to be allocated. very big

2. There is no optimization calculation of the algorithm, and the bandwidth utilization rate of the manual setting structure is not high. For the same transmission requirements, the bandwidth caused by the manual setting of the physical structure may be several times larger than the bandwidth caused by the algorithm optimization setting

3. The bandwidth utilization rate is not high, and more switches need to be added, which increases the physical cost and the complex system of security.

4. The bandwidth utilization rate is not high. During internal transmission, information needs more buffering and waiting inside the switch, and the delay is higher, which easily exceeds the performance requirements of information transmission.

[0003] The reasons for the shortcomings of manual settings are as follows: 1.664 network is the backbone network of a new type of integrated modular avionics system. The general 664 bandwidth has 100Mbit / S. It is a very new network protocol. It has a history of more than 10 years since the protocol was issued. , for the previous avionics system, the communication demand is not large, and the bandwidth resources are basically sufficient; but now there are some projects, even if it is a 664 network, without structural optimization, it still cannot meet the performance requirements of the system for communication

2. The traditional avionics system network is a single-point-to-single-point, and a single-point-to-multipoint simple network. It has never used the deterministic Ethernet that requires multiple switches to support the 664 network, so due to the inertia of technology use , did not realize the importance of resource calculation and optimization for network performance

3. In the process of system development, there is a process of dismantling requirements from top to bottom. The physical structure of the network is a structural existence in the avionics system. In the dismantling of requirements, it belongs to the upper-level requirements; and the configuration of the network (the configuration affects the bandwidth Calculation) as the lower-layer requirements, the lower-layer requirements need to be done according to the upper-layer requirements; for the 664 network, the existing physical structure seriously affects the network configuration, which in turn affects the performance of the network; It is also difficult to do a good job; and the existing avionics system development has project process control of iterative development. If problems arise, the upper system scheme can be modified, so this problem is not paid much attention to; but now some projects, especially civil aircraft projects, are airworthy. The seriousness of the certification, the iterative modification of the physical structure of the avionics system will cause a lot of follow-up work, resulting in too high cost

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