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AN ANALYSIS OF DIGITAL RANGE TRACKERS.
JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB
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The range tracker is a device used in the receiver of pulse radar systems which performs the vital operation of maintaining automatic range track on the received target pulse. Normally the range tracker is a second-order control system with the measured range being the controlled output. The digital range tracker performs this operation by utilizing digital circuit techniques. In this paper a linear and a nonlinear digital range tracker system are analyzed. The linear system employs a multi-state analog-to-digital AD converter which senses the sign and magnitude of the error and between the target and measured range. The nonlinear system employs an AD converter which senses only the sign or absence of range error. Z-transform techniques are employed to develop the transfer functions for the linear system. System characteristics such as transient response, stability and time solutions for various input functions are given. Piece-wise linear equations are used as the governing equations for the nonlinear system. The analysis emphasizes system velocity response to velocity-step inputs and closed-loop range response to a specific periodic input. Author
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