Since the traditional decoding method needs the help of the encoder and decoder,and the system message struc-ture of MUOS is uncertain,a simpler system message decoding method is proposed. The method to analyze the specific RRC message structure is used to extract the specific system message without ASN.1 compiler. The scheme is first used for MUOS. The simulation test is performed with the actual MUOS data. The primary scrambling code number in the simulation results is consistent with the recognition result of the primary scrambling code,which proves that the scheme can decode the downlink sys-tem message of MUOS accurately.%针对传统的解码方法需要借助编解码器的问题,以及MUOS系统消息结构不确定的特点,提出一种更加简单的系统消息解码方法.在不使用ASN.1编译器的同时通过具体解析RRC消息结构的方法提取特定的系统信息,并将方案首次用于MUOS.用实际的MUOS数据进行仿真测试,仿真结果中主扰码号与主扰码识别的结果一致,证明了方案能够准确解码MUOS下行链路系统消息.
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