When a wideband phased array radar is detecting high-speed targets, it is likely to encounter the problems of aperture traversing and range migration, and the fast-time frequency of the echo is coupled with spatiotemporal variables.To solve the problems, a joint correction method is proposed.The method uses frequency compensation and 1D Time-Scaling (TS) for decoupling when the radar works in narrow-transmission mode, and uses 2D TS to decouple the echo in wide-transmission mode of the radar.As for the differentiation of radar transmission modes, the corresponding defining conditions are given.The simulation results show that the proposed method can solve the cross-element and cross-pulse problems in the echo caused by aperture traversing and range migration, and the loss of Signal-to-Noise Ratio (SNR) at the threshold for effective target detection after the joint correction is no more than 3 dB, compared with that of the ideal state.