Treffer: DMTI canceller using a random access memory

The Moving Target Indicator (MTI) technique is one of the most important signal-processing devices for improving signal-to-clutter ratio in present day radar systems. The MTI makes use of the fact that echo signals from moving targets are doppler-shifted in frequency relative to those from stationary or very slowly moving targets (clutter). The basic principle is to delay (or store) the echoes from one transmitted pulse for exactly one pulse period and then subtract from those values the values obtained during the next transmitted pulse. This delay-and-subtract circuitry is called the canceller. However, some conditions hinder the performance of the MTI and have to be overcomed. In this project three of these conditions: blind velocities, weighting constants, and second-time-around returns are analyzed. Design of a digital MTI canceller using random access memory is then developed using the knowledge gained through this analysis. ; California State University, Northridge. Department of Engineering. ; Includes bibliographical references (pages 30-31)