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FFFS (Form Fit Function Specification) coding message decoding method

A decoding method and message technology, which is applied in the field of query response, can solve problems such as long decoding time and resource consumption, and achieve the effects of improving decoding speed, saving resources, and saving query time

Inactive Publication Date: 2013-10-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] The existing FFFS-encoded message decoding method needs to reorder and store the message when searching for control bits and scrambling code bits, which requires resource consumption and takes a long time to decode.

Method used

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  • FFFS (Form Fit Function Specification) coding message decoding method
  • FFFS (Form Fit Function Specification) coding message decoding method
  • FFFS (Form Fit Function Specification) coding message decoding method

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Embodiment Construction

[0051] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0052] 1. FFFS message format

[0053] FFFS messages are divided into two types, long messages and short messages. Their formats are shown in Tables 1 and 2, where Table 1 is the long message format and Table 2 is the short message format.

[0054]

[0055] Table 1

[0056]

[0057] Table 2

[0058] As shown in Table 1 and Table 2, the long message has a total of 1023 bits, among which, the user data bits include 83 groups of 11-bit words, namely b 1022 ,b 1021 ,...,b 111 ,b 110 A total of 913 bits, which is 830 bits after being restored to user message inform...

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Abstract

The invention provides an FFFS (Form Fit Function Specification) coding message decoding method. On the basis of calculating a message frame header offset S, the value of the message frame header offset S is subjected to classified discussion, control bit addresses and scramble bit addresses are found, and control bit data and scramble bit data are directly read, so that a message needs not to be rearranged and stored. Not only are resources saved, but also, above all the decoding speed can be quickened, and the decoding time is shortened; and meanwhile, control bits and scramble bits are continuous, the search of the control bits and the scramble bits is completed in one step in the method, and the query time is also saved.

Description

technical field [0001] The invention belongs to the technical field of query response, and more specifically relates to a decoding method for FFFS coded messages. Background technique [0002] FFFS coding strategy (Form Fit Function Specification Coding Strategy) is a message coding standard formulated by EUROSIG (European Signaling Company Federation) for the unification of European railway informationization. This coding standard is applied in the query response system and is a A specification for the generation of transponder messages. [0003] The message in the transponder is compiled in advance, and the FFFS encoding work can be completed by writing a program. Save the solidified message in the ROM of the transponder. When the train passes by, the transponder receives the power carrier of the on-board interrogator and enters the working state. Then, the pre-stored FFFS message is sent out as an FSK modulated signal. After the FSK signal is demodulated, the FFFS mess...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04B1/59
Inventor 詹惠琴王帅周权金恒古天祥张鑫鑫
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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