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Coding Method of Global Uniform Code Distance in Railway Microcomputer Interlocking System

A technology of microcomputer interlocking and coding method, applied in the computer field, can solve problems such as difficulty in coding, and achieve the effect of being convenient to use and reducing complexity

Active Publication Date: 2018-03-02
SHANGHAI FUXIN INTELLIGENT TRANSPORTATION SOLUTIONS
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this implementation method is intuitive, it has the problem of high coding difficulty. Usually, a tool software is written to automatically generate these codes, and then used inside the software

Method used

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  • Coding Method of Global Uniform Code Distance in Railway Microcomputer Interlocking System
  • Coding Method of Global Uniform Code Distance in Railway Microcomputer Interlocking System
  • Coding Method of Global Uniform Code Distance in Railway Microcomputer Interlocking System

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Experimental program
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Embodiment Construction

[0015] 1) Determine the code distance W to be extended according to requirements;

[0016] 2) Determine the basic codeword B and its quantity, and calculate the required binary digit C with a numerical value greater than the smallest power of 2 of this quantity; for example: if this number 250 needs to be encoded, at least 1 byte is required, From 0 to 0xFA (hex representation of 250).

[0017] 3) Extend coding according to the specific code distance requirements, and the formula for extending coding is as follows:

[0018]

[0019] X is the code after extending the code distance, W is the code distance required to be extended, B is the basic code word, C is the binary digits required by the basic code word, and C×W≤64.

[0020] For example: 4-bit code distance (W) is required, and 0 to 0xFA is encoded (B), because a maximum of 8 bits (C) are required to represent the basic encoding. but:

[0021] When B=0x0, calculate X=0x00000000 according to the code distance formula ...

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Abstract

The invention discloses a global unified code distance encoding method. The global unified code distance encoding method comprises the steps that bit width needed by basic coding is determined according to the actual code number; codes are expanded according to specific code distance requirements, wherein the code expanding formula is seen in the specification, X is codes with expanded code distance, W is the code distance needing expanding, B is basic digits, and C is binary bits needed by the basic digits. The global unified code distance encoding method can rapidly increase or decrease the global unified code distance, the code distance requirement for internal encoding required by safety software can be met, complexity is reduced when digits meeting the code distance requirement are adopted, and the method is convenient to implement.

Description

technical field [0001] The invention relates to the field of computers, in particular to a coding method for a global uniform code distance of a railway microcomputer interlocking system. Background technique [0002] In the railway microcomputer interlocking system, the interlocking software is the core software for logical operation and equipment control of the system, so its security needs to be fully considered. According to the technical standard requirements issued by the former Ministry of Railways, the internal data of the software must meet the 4-bit code distance in encoding to prevent unrecognizable changes in the meaning of the data after the computer memory bit jumps. [0003] At present, in order to meet the requirements of 4-bit code distance encoding, the most direct method is to directly find two code words that already meet the 4-bit code distance in the 32-bit binary number, for example: 0x55555555, 0x555A555A, 0x55A555A5, 0x55AA55A5, 0x5A5555A5, etc. . ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F9/44
Inventor 陈云闫坤
Owner SHANGHAI FUXIN INTELLIGENT TRANSPORTATION SOLUTIONS
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