基于北斗压缩编码传输的海气界面监测系统  

Sea-to-air interface monitoring system with transmission in Beidou compression coding

作　　者：杨少龙 黄金 李伟超 陈松豪 YANG Shaolong;HUANG Jin;LI Weichao;CHEN Songhao(School of Naval Architecture and Ocean Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学船舶与海洋工程学院,湖北武汉430074

出　　处：《中国航海》2023年第1期66-72,共7页Navigation of China

基　　金：省级创新训练项目资助(S202010487019)。

摘　　要：研究一种基于北斗短报文压缩编码传输的海气界面监测系统,以海气界面探测气象站为离岸平台,实现分钟级高频采集海上特定位置风速、风向和卫星数量等气象数据,将原始气象数据经数据压缩和传输压缩处理后由北斗二代通信终端传至岸基海洋气象监测站。数据压缩中针对风向数据均值过程中存在跨越0°~360°线以及低速风向测量误差大等问题,提出一种基于概率统计的改进单位矢量平均算法,试验表明:处理后的平均风向数据更加平滑;针对北斗小通信量所面临的数据传输压缩问题,提出一种部分增量式取整定长字典编码方法数据压缩率达36.0%,正确率达97.8%,满足北斗民用级别短报文通信传输限制。The sea-to-air monitoring system consists of an offshore monitoring platform and a shore-based ocean weather station.The former measures,at minute-level interval,wind speed,wind direction,number of satellites and other meteorological information at set location at sea and compresses those data.The compressed data is transmitted to the shore station through a second generation Beidou communication terminal.A unit vector averaging algorithm improved with probability and statistics theory is introduced to solve the Oo~360°crossing issue and improve the accuracy of wind direction measurement at lower wind speed.Since the bandwidth of Beidou communication channel is limited,an increment rounding dictionary encoding is used.The data compression rate of 36.0% with an accuracy of 97.8% is achieved.

关 键 词：海气界面监测 北斗短报文通信 改进单位矢量平均 压缩编码 数据字典 

分 类 号：X834[环境科学与工程—环境工程]