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3-5DA-1-M-262303-A-214(*moving target indicators, doppler effect), (*high pass filters, target discrimination), (*aerial targets, *radar tracking), radar clutter, integral transforms, transfer functions, control systems, feedback, mathematical modelsrecursive filters, signal processing, control theory, digital filtersA brief introduction to the digital Moving-Target-Indicator problem is presented along with a description of the conventional filters most commonly used for this purpose. The idea of initialization is then introduced for use with step scan radars, and the recursively implemented filter is proposed as a leading candidate for the Moving-Target-Indicator role. The essential features of the state variable approach are discussed and several useful relationships are developed. These expressions are then employed in the analysis of a number of filters, and some conclusions are drawn regarding the applicability of the state variable approach. (Author)

ARMY MISSILE COMMAND REDSTONE ARSENAL ALA ADVANCED SENSORS DIRECTORATEAnalog-To-Digital Converter Technology Preliminary Investigation and Proposal.Technical rept.,Lancaster,James F. ;Burlage,Donald W. ;Fletcher,Robert H. ;RE-TR-73-25DA-1-M-262303-A-214(*analog-to-digital converters, *radar equipment), video signals, processing, reviewssignal processingA brief introduction to analog-to-digital converters is presented, which includes both basic characteristics as well as typical error sources. Some more common types of converters are described and current state-of-the-art in this area is indicated. Various performance evaluation techniques are illustrated, and a proposed program for performing in-house analog-to-digital converter evaluations is outlined. (Author)