机动目标一阶加速度的频率普分析，以及多普勒展宽，相干积累。以70km，径向速度700m，加速度20m/s^2目标为例-An acceleration of maneuvering target frequency bands Pu analysis, and Doppler broadening, coherent accumulation. To 70km, the radial velocity 700m, acceleration 20m/s ^ 2 goals, for example