JCS_V1_N3_A2 R. Srinivasa Rao P.V. Subbaiah B. Prabhakara Rao Journal on Communication Engineering and Systems 2277-5242 1 3 11 16 Radar Signature, Transmission Line Matrix Method, Symmetrical Condensed Node, Time-domain Integral Equation Method, Moment Method The radar signature calculations play an essential role in the design and functioning of today’s radars in detecting the surface and air targets. Radar interrogation is essentially a transient electromagnetic scattering process and direct transient analysis provides an opportunity to observe and to interpret scattering behavior. We present in this paper a comparison of two popular time domain numerical techniques widely used for direct transient analysis, namely, the transmission line matrix (TLM) method and the time-domain integral equation (TDIE) method. Both the methods belong to the category of time domain techniques; however, their modeling philosophy is quite different. Whereas the TLM method is based on the implementation of the Huygens principle by modeling the space with a system of interconnected transmission-lines, the TDIE is based on well known method of moments. The comparison is made via standard canonical shaped dielectric bodies, namely, a cube, and a sphere, mainly to address the factors affecting accuracy, efficiency, and the required computer resources. May - July 2012 Copyright © 2012 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=1890