Abstract: The unsatisfactory integrated sidelobe energy performance limits the phase coded signal applied in the observation of extended targets. Based on the phase coded waveform with uniform sidelobe to reduce sidelobe energy, the mismatched filter technology is utilized to process echo for producing nearly uniform sidelobe. Moreover, the original transmitted signal components is extracted from the echo without any interference, the sidelobe canceller is constructed with the conjugate signal of itself but shifted by one bit. As a result of the sidelobe cancel and other preprocessing, the phase coded signal integrated sidelobe level ratio is improved remarkably, and also obtained advanced Doppler tolerance that similar to linear frequency modulated signal. The proposed method may make the phase coded waveform obtain widely radar apply such as observation space-to-ground.