Comparative Analysis of Performance of Phase Coded Pulse Compression Techniques P. Keerthi Silpa 1 , N. Deepika Rani 2 and N. Bala Subrahmanyam 3 I. INTRODUCTION RADAR is used in military for surveillance, controlling and guiding weapons, for navigation of ship etc. In many of these applications, system employs pulse compressed waveform good performance. Lewis B.L. and Kretschmer F.F. [1]-[2] describes the evolution of Frank, P1, P2, P3 and P4 phase codes from LFM and summarized on the derivation of poly-phase codes. Rawat C.D. and Sarate A.D. [3] compared peak side-lobe level, range resolution of both frequency and phase modulated pulse compression techniques simulating in MATLAB. The importance of matched filter in the receiver section for detecting the presence of the targets demonstrated by Skolnik M.I. [4]. Eustice D., Baylis C. and Marks R. J. [6] described and detailed the properties of Woodward’s ambiguity function which is output of matched filter. In this paper, implementation of matched filter is described in section II. Dependency of range resolution on pulse width is illustrated in section III. Various phase coding techniques and corresponding matched filter responses are explained in section IV. The work is summarized in in section V by comparing the PSL of various phase codes. II. MATCHED FILTER Basic operations performed by RADAR in the receiver section is detecting the presence of the target. Matched filter is the basic important block in the receiver section whose output is used to extract information and to detect the presence of target. Matched filter is a network whose frequency-response function leads to maximum output peak signal to mean noise power ratio (SNR). It is a linear time invariant (LTI) system and causal system whose impulse response determined maximizes the SNR. In the receiver section, the received echo signal is demodulated therefore signal 1 Department of Electronics and Communication Engineering Gayatri Vidya Parishad College of Engineering (Autonomous), Visakhapatnam, A.P, India 2 Department of Electronics and Communication Engineering Gayatri Vidya Parishad College of Engineering (Autonomous), Visakhapatnam, A.P, India 3 Department of Electronics and Communication Engineering Gayatri Vidya Parishad College of Engineering (Autonomous), Visakhapatnam, A.P, India International Journal of Latest Trends in Engineering and Technology Vol.(7)Issue(3), pp. 573-580 DOI: http://dx.doi.org/10.21172/1.73.577 e-ISSN:2278-621X Abstract- RADAR performance is measured by its sensitivity of detecting targets at farther distance and range resolution capability. To improve the detection ability long pulse is needed and to improve range resolution capability short pulse is needed. Thus, there exists trade-off between detection and range resolution. To overcome this problem, pulse compression techniques are employed. Pulse compression can be done either by using frequency modulation or phase modulation to simple pulse. Utilization of frequency modulated pulse compression techniques leads to arousal of high side-lobes at the matched filter output. Presence of high side- lobes leads to target masking in presence of multiple targets. To reduce peak side-lobe levels phase coded pulse compression technique is employed. In this paper, the PSL of various phase coding techniques are compared through simulations in LabVIEW. Keywords – Matched Filter, Range Resolution, Phase Codes, PSL