Long message segmentation and reliable communication method based on Beidou short message communication
A technology of Beidou short message and communication method, which is applied in the field of long message segmentation and reliable communication based on Beidou short message communication, which can solve the problems of limited communication frequency and limited single communication capacity, and achieve enhanced robustness , mentioned the effect of sending frequency and guaranteeing reliability
Active Publication Date: 2016-07-06
NANJING UNIV
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[0004] However, the current short-message communication of Beidou first-generation satellites has the following shortcomings: (1) The capacity of a single communication is limited: a maximum of 120 Chinese characters or 1680 bits of short-message communication service can be provided each time, and the civilian communication capacity is only 78 bytes; (2) The communication frequency is limited: the communication frequency is divided into three grades: 1 second / time, 30 seconds / time and 60 seconds / time, and the civilian communication frequency is 60 seconds / time; (3) has a certain packet loss rate, which requires Take additional protocols to ensure reliability
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[0027] In order to better understand the technical content of the present invention, specific embodiments are given together with the attached drawings for description as follows.
[0028] Aspects of the invention are described in this disclosure with reference to the accompanying drawings, which show a number of illustrated embodiments. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in more detail below, can be implemented in any of numerous ways, since the concepts and embodiments disclosed herein are not limited to any implementation. In addition, some aspects of the present disclosure may be used alone or in any suitable combination with other aspects of the present disclosure.
[0029] like Figure 1-Figure 7 As shown, according to the embodiment of the present invention, a long message segmentation ...
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The invention relates to the technical field of satellite communication and provides a long message segmentation and reliable communication method based on Beidou short message communication. The method comprises an encoding link, a communication link and a decoding link. In the encoding link, compressed encoding and long message segmentation are carried out on data to be sent, identification bits are added to form a plurality of sub packets, and error correcting encoding is carried out; in the communication link, according to the output of the encoding link, a sending end selects a channel for sending a Beidou message based on the current idle state of an SIM card, and then the Beidou message is packaged according to an SIM card ID of the selected sending channel and is sent out; and in the decoding link, when a receiving end receives a last message of a long message, error correcting decoding is carried out, then splicing is carried out according to the identification bits of the sub packets, finally uncompressed encoding is carried out on the received complete message, and a final communication message is obtained. By adopting the method, the reliability of first-generation Beidou short message communication is effectively ensured under the condition that retransmission is not needed, and the relatively high robustness is ensured.
Description
technical field [0001] The invention relates to the technical field of satellite communication, in particular to a long message segmentation and reliable communication method based on Beidou short message communication. Background technique [0002] With the development of modern communication and satellite technology, the application range of satellite system is wider and wider, not only limited to positioning and navigation applications, but also includes remote sensing, surveying and mapping and communication applications. The first-generation Beidou satellites launched by my country have short-message communication functions that general navigation satellite systems, such as GPS and second-generation Beidou satellites, do not have. [0003] Beidou first-generation satellites can provide short message communication services between user machines and user machines, and between user machines and ground central stations. Each user machine has a unique ID number, and adopts ...
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IPC IPC(8): H04L1/00H04L1/16H04L1/18
CPCH04L1/0033H04L1/0036H04L1/1607H04L1/18
Inventor 王健刘畅周东杰方元
Owner NANJING UNIV