中文摘要：

深空通信中的自主无线电接收机技术在航天领域中有着重要的意义,它能在未知无线电信号特性的情况下自动实现信号参数的估计和接收机的重新配置。该文在无线电信号通用模型基础上,分析总结了自主无线电接收机的参数估计顺序和结构模型,讨论了参数估计的算法,并着重对粗估计阶段使用的利用归一化的准对数似然比的调制识别算法进行了改进和仿真分析。

英文摘要：

The technology of autonomous software-defined radio receivers for deep space communication has an important significance in the field of aerospace, which is also the subject that the United States National Aeronautics and Space Administration is exploring. Autonomous software-defined radio receivers can achieve the receivers, discusses the parameter estimation algorithms, and gives the modified method, simulations and analyses about the modulation recognition algorithm usinz naLLR.