现代化卫星导航电文编码方案设计与分析

摘要

针对我国新一代北斗卫星导航系统建设和导航电文设计需求，阐述了各种GNSS导航电文的编码方案，重点分析了现代化GNSS导航电文采用的低密度奇偶校验码编码方案，采用信道建模和蒙特卡洛仿真方法，结果表明：不同码长、不同迭代次数和不同译码方法对低密度奇偶校验码的性能具有较大影响。最后，提出了导航电文编码方案设计建议，为我国北斗全球系统导航电文编码方案的设计提供参考。%In view of our country’s new generation BDS construction and navigation message design requirements,enco-ding solutions for various GNSS navigation messages were described. In this paper,the low density parity check(LDPC)codes of the modern GNSS navigation message was analyzed. Channel modeling and Monte Carlo simulation were used to validate the performance of LDPC. The results showed that different code length,different number of iterations and different decoding methods would have great influence on the performance of LDPC codes. In the end,the suggestion of the encoding solution design for the navigation message was put forward,which could provide a reference for the design of the encoding scheme of BDS.