连续相位调制信号参数的联合估计方法研究

Joint Estimation of the Parameters of Continuous Phase Modulated Signal

连续相位调制(CPM)信号由于具有很好的频谱特性,在卫星通信和地面移动通信中得到了越来越广泛的应用。在通信侦察中,要对截获到的CPM信号进行解调,必须事先对已知信号的调制指数、频率、码速率等进行调制侦察处理。对这些调制参数估计是通信侦察信号处理的一项重要内容。文中提出了一种CPM信号的多参数联合估计算法,首先对CMP信号进行非线性变换并计算功率谱,然后通过搜索峰值位置来估计出信号参数。仿真结果表明,调制指数的估计误差小于0.05,频率和码速率的估计误差小于0.1%,能够满足CPM信号解调精度要求。

Continuous phase modulation(CPM) signal has been widely used in satellite communication and ground mobile communication because of its good spectrum characteristics. In the communication reconnaissance,the modulation index,frequency and code rate of the signals must be estimated before demodulation. The estimation of these parameters is an important content of communication reconnaissance signal processing. A multi parameter joint estimation algorithm of CPM signal is proposed. The CMP signal is transformed nonlinearly,the power spectrum is calculated,and then the signal parameters are estimated by searching the peak position. The simulation results show that the estimation error of the modulation index is less than 0. 05,and the frequency and code rate are less than 0. 1%,which can meets the requirement of CPM signal demodulation.