The Randle Cliff Radar Digital Range-Measuring Instrument

摘要

The Randle Cliff Radar (RCR) facility at the NRL Chesapeake Bay Division, which employs a 150-ft-diameter steerable antenna, uses digital data-acquisition techniques. In a complex of digital instrumentation, one instrument incorporates several noteworthy and unique features. The Digital Range-Measuring Instrument(DRAMI) is a multiple-mode radar-range digitizer. Though basically a gated-pulse counter capable of continuous readout of range information in either binary of BCD form, the DRAMI is unique in that unambiguous target range measurements are obtainable to a maximum range of 100,000 naut mi plus or minus 0.1 naut mi), even though the target lies beyond a number of radar interpulse periods. Another feature permits the accumulation, prior to readout, of several successive radar range values. The values are stored in the DRAMI register until a readout command is received, at which time display and recording are accomplished. Still another feature is the 'Test' mode of operation, in which all commands are internally generated and the DRAMI is, in a sense, made to check itself. In the event of improper operation, several key signals can be manually generated from the front panel, thus permitting the operator to pinpoint technical difficulties. The DRAMI is a versatile, reliable, and accurate device. It was specifically developed for use with the RCR system in order to facilitate range studies of fast-moving or distant targets. However, the principles of its operation can be applied to meet the needs of any radar system. (Author)