Abstract: Polynomial phase modulated signals are widely used in modern radar.The estimate of the phase parameters has practical importance in emitter identification and classification.Cramer-Rao lower bound for wavelet transform-based polynomial phase coefficient estimates is derived，and a new estimation algorithm is also presented.The theoretical analysis and computer simulation results show that this kind of approach can reach much lower Cramer-Rao bound being compared with the existing techniques.

Key words: Cramer-Rao lower bound, phase estimate, polynomial phase modulated signal, wavelet transform

摘要： 现代雷达广泛使用相位调制信号，相位参数的有效估计对辐射源的识别和分类具有重要意义。运用小波变换方法对多项式相位信号的相位系数进行了估计，给出了小波变换方法下的估计多项式相位调制信号相位系数的Cramer-Rao下限，并提出了一种新的相位系数估计算法。理论分析和仿真结果表明利用小波变换方法估计相位调制信号的相位系数参数估值更精确，可以得到更低的Cramer-Rao下限。

关键词: Cramer-Rao下限, 相位估计, 多项式相位调制信号, 小波变换