关键词: 物联网, 北斗报文, 远程传输, 有效性

Abstract: Internet of things combined with a variety of backbone transmission is very suitable for remote real-time monitoring, but in some areas, remote IT transmission trunk such as Internet, cable line usually does not exist, the GSM signal maybe weak or even cannot be found, in consideration of the economic point and the actual transmission environment, the message services provided by the Beidou satellite navigation system can be used. However the transmission frequency and the number of characters in each transmission sent by Beidou message are limited at present, this paper presents an effectiveness optimization mechanism of remote transmission (EMRT) that improves the efficiency of transmission sent by Beidou message services. This mechanism includes three main parts: (1)“Index compression method (ICM)”, which aims to compress redundancy indicators for the current message; (2) “Element compression method (ECM)”, which accords to the agreement agreed in advance to remove “external packaging” that known by both sides for the current indicators; (3) “Bit compression method (BCM)”, which aims to compress the first four bits for the current elements. At the same time, the effect analysis of EMRT on improving the effectiveness of transmission sent by Beidou message services are quantified, and the factors that affect the effectiveness of transmission sent by Beidou message services are analyzed too. The theoretical analysis and the actual data validation indicate that these mechanisms have a significant effect on improving the effectiveness of transmission sent by Beidou message services, and have important theoretical and practical significance to the transmission sent by Beidou message services in Chinese Beidou message services.

Key words:  Internet of things, Beidou message, remote transmission, effectiveness