Ping Elongator-Modulator for Realistic Echo Synthesis.
Patent, Filed 15 Jun 65, patented 29 Oct 91,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A Sonar decoy system receives an interrogating pulse from an energy source and then distorts, elongates, amplifies, and retransmits the pulse to simulate an echo of that pulse rebounding from the various reflecting surfaces of a moving submarine. To refine the allusion of an actual echo, a portion of the pulse signal is circulated and recirculated through a delay line several times, and then reinserted into the outgoing signal to contribute random additions to and phase cancellations of the various frequency components of the signal.
- Radio Countermeasures