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CONTIGUOUS FILTERING FOR HF RADAR ACCELERATION AND VELOCITY SIGNAL PROCESSING
NAVAL RESEARCH LAB WASHINGTON DC
A contiguous filter was earlier proposed for use with the spectral compression technique of processing acceleration signals. This technique is implemented by the Acceleration Gate System located with the HF radar at the Chesapeake Bay Division CBD of NRL. The filter will permit the acceleration and velocity processing system to accommodate a wide dynamic range of input signals by, first, limiting large-amplitude interference or desired signals without generating harmonics so that they will not be spread in acceleration or velocity on the display, and in fact, are eliminated if they do not match an acceleration profile, and, second, minimizing the capture effect of large undesired signals over smaller desired signals without sacrificing minimum detectable signal level. At the same time, linear signal response is provided for azimuth determination and other measurements. A discussion is given of the operational requirements of such a composite filter, followed by detailed design and performance characteristics of a model designed and constructed to verify its operation with the system at CBD. A series of photographs illustrates the improvement in the displayed signals that results from the use of the contiguous filter.
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