For reentry telemetry environment remote signal low signal noise ratio (SNR),and traditional demodulation method demodulation higher threshold,combined with PCM/FM signal phase characteristic,based on a symbol detection (MSD) software dissolve adjustment methods:continuous observed several element signal and local signal joint detection.And the corresponding synchronous demodulation algorithm ensure smoothly.Simulation and test results verify the effectiveness of the MSD.%针对再入遥测环境下遥测信号信噪比较低,而传统解调方法解调门限较高的问题,结合PCM/FM信号相位特性,研究一种基于多符号检测(MSD)的软件化解调方法；对连续观测到的若干个码元信号与本地信号进行联合检测.研究相应的同步算法保障解调的顺利进行.仿真和测试结果验证了MSD的有效性.
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