Information source coding and decoding method and device for Beidou satellite short message expansion information transmission

Abstract

The invention provides a source encoding method for expanding the information quantity transmission of a Beidou-satellite short message. The source encoding method for expanding the information quantity transmission of the Beidou-satellite short message comprises the following encoding processes of encoding a word string contained in the short message and defined in a first encode table, so as to obtain a first code word of which the most significant bit is a first characteristic value; encoding a Chinese character except the word string contained in the short message and defined in the first encode table, so as to obtain a second code word of which the most significant bit is a second characteristic value; encoding a word string contained in the short message and defined in a third encode table, so as to obtain a third code word of which the most significant bit is the second characteristic value; encoding a character contained in the short message and not defined in the third encode table, so as to obtain a fourth code word of which the most significant bit is the first characteristic value. The invention also provides a source encoding device, a source decoding method and a source decoding device for expanding the information quantity transmission of the Beidou-satellite short message, so that the capacity of a Beidou-satellite terminal for transmitting a Chinese short message is greatly promoted.

Description

technical field [0001] The invention relates to an information source encoding and decoding method and device for transmitting Beidou satellite short messages to expand the amount of information. Background technique [0002] In the existing Beidou satellite short-message communication system, the current communication capacity of a civilian Beidou command card is to send information once every 50 seconds, and each communication capacity is 628Bits. The existing Beidou satellite short message communication system uses GB2312 encoding for each Chinese character when sending Chinese text messages, that is, each Chinese character needs to occupy 2 bytes (16bits), so the communication capacity of 628Bits can only transmit 39 Chinese characters . [0003] Therefore, in the existing Beidou system, the amount of information transmitted by short message communication is small, which is not conducive to the development of some applications, such as the fishery industry, the release ...

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Problems solved by technology

[0003] Therefore, in the existing Beidou system, the amount of information transmitted by short message communication is small, which is not conducive to the development of some applications, such as the fishery industry, the release of weather notifications, and fishery market conditions.

Slightly large communication data needs to be unpacked and sent in segments. The corresponding reception of Beidou needs to be received in multiple pieces, and the user experience is very poor for reading part by part.

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