中文摘要：

为了提高直升机在应急无线紫外光通信辅助起降中信标搜寻、定位降落的效率和可靠性,该文提出一种基于喷泉（LT）码的分等级编码通信方案,采用不同等级编码的分级方法设计了不同场景、不同引导阶段的通信策略,分析了高丢包率信道环境中变化删除概率下的误比特率,并与其他传统信道编码进行了比较。实验仿真结果表明,在二进制删除信道下,该分等级编码方法可显著降低LT码的误比特率,提高了编译码性能;该通信策略适用于高丢包率信道环境,能获得更好的通信效果,提高了直升机应急辅助起降的安全性。

英文摘要：

In order to improve the efficiency and the reliability of the helicopter guiding in the beacon researching and locate landing, an encoding communication scheme based on unequal level coding Luby Transform（LT） code is proposed. Different communication strategies are proposed for different scenarios. The different guiding strategies considering the unequal level coding scheme are designed. The bit error rate of the unequal level coding LT code with different communication strategies is analyzed. The coding scheme and communication strategy are simulated by computer. The simulation results show that the bit error rate of the unequal level protection encoding scheme is significantly reduced and the coding performance is improved over binary erasure channel. The strategies can adapt to different channel environments, and the reliability of communication is improved. Thus, helicopter emergency landing safety is improved.