针对传统的相参积累方法对匀加速目标能量积累效果不理想的缺点，选取4种典型的相参积累方法进行仿真，研究不同变换积累方法对匀加速目标线性调频信号积累的特点，并通过实测S波段对海观测雷达数据比较脉冲数对不同时频分析方法能量积累的差异。结果表明：4种变化中分数阶Fourier变换(FRFT)的相参积累性能最好，能够有效抑制噪声，估计加速度，具有良好的时频聚集性，并且在一定范围内随处理脉冲数的增加，相参积累性能进一步提高。

Aiming at the disadvantage of the conventional phase-coherent accumulation method for uniform acceleration of target energy accumulation, four typical phase-coherent accumulation methods are selected and simulated. The characteristics of different transformation accumulation methods for uniform acceleration target Linear Frequency Modulated(LFM) signal are studied, as well as the differences of energy accumulation in different time-frequency analysis methods by pulse number. The result shows Fractional Fourier Transform(FRFT) can suppress noise effectively, estimate acceleration directly，and has good performance in the time-frequency clustering. The performance of coherent integration is improved further with increase of pulse number within limits.