In this paper we develop a signal processing algorithm for the detection, ranging and Doppler localization of moving target using Golay code as the phase coding signal. We exploit the side-lobes suppression property of Golay code, that occurs in complementary code pair, for side-lobe free target detection, range estimation and Doppler localization. Golay code based phase coding is achieved using QPSK (Quadrature Phase Shift Keying) scheme. When the transmitted signal is reflected from a moving target, its complex demodulation is carried out at the receiver. This is followed by correlation of each component of demodulated signal with one member of the complementary Golay code pair separately. The correlation results of the two channels are added together, leading to effective side-lobes suppression when phase and frequency of the demodulating carriers match with that of the received signal. The shift in the time index of the correlation peak gives the range to the target. Frequency of the demodulating carriers at which side-lobe free correlation peak occurs at the output indicates Doppler frequency corresponding to the target speed. The developed technique exhibits excellent Doppler localization, target detection and range estimation performance by overcoming the side-lobe limitations of the conventional phase coding signals in ranging applications.