介绍了某共轴式双旋翼无人直升机 (简称无人直 )遥测数据传输中所采用的数据加解密方法 .该方法具有加密强度高 ,加解密运算简单 ,错误扩散小 ,以及无信息扩散等特点 ,在实现时充分考虑了遥测数据的字、帧结构和遥测信道编码 .经过试飞 ,证明了该方法的可行性和可靠性 The data encryption and decryption method used in telemetry data transmission of a coaxial double-rotor unmanned helicopter is introduced.The method has the advantages of high encryption strength, simple encryption and decryption, small error diffusion and no information diffusion Characteristics, in the realization of full account of the telemetry data word, frame structure and telemetry channel coding.Through the test flight, the feasibility and reliability of the method is proved