AN ANALYSIS OF DIGITAL RANGE TRACKERS.
Abstract
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 (A/D) converter which senses the sign and magnitude of the error and between the target and measured range. The nonlinear system employs an A/D 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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1965
- Accession Number
- AD0623973
Entities
People
- Charles Edward Ackerman
Organizations
- Johns Hopkins University Applied Physics Laboratory