Long-time coherent integration technique is one of the most important methods for the improvement of radar detection ability of weak moving target.Based on the analysis of range and Doppler migrations of a moving target

a long-time coherent integration method via Radon-fractional Fourier transform (RFRFT) is proposed.The target's observation values in the range-slow time plane are firstly extracted according to the searching area of the preset motion parameters.Then the observation values are matched and accumulated by FRFT and a nonuniformly moving target can be declared by the detection map in the RFRFT domain.The proposed method can compensate the across range unit and Doppler frequency migration effects simultaneously.In addition

the background clutter and noise can be well suppressed

which increases the integration gain.Simulation results show that the proposed method has the ability of detecting weak moving target under strong clutter environment.