This thesis presents the design of a software program and digital system to synthesize target return signals for Electronic Warfare (EW) applications. The synthesized target echo returns are used to counter high resolution radar systems. Synthesizing a realistic target echo return requires knowledge of the motion and electromagnetic properties of the simulated target. The software program implements a realistic motion algorithm for Naval targets in a variety of sea conditions. Another algorithm is designed to create the target model used in the software. Within the software application a user interface is used to define simulation scenarios for producing synthesized target return signals. The digital system design utilizes parameters from the software to synthesize the false target echo signal. Simulations performed in MATLAB verify the viability of the motion algorithm, software program and digital system design.