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| Number | Title | Issue Date |
| 4306301 | Wide band frequency shifter in variable amounts 2. A sonar decoy system for receiving and retransmitting any interrogating signal throughout a wide band of frequencies, said system comprising; a sonar receiver with a receiving hydrophone; a sonar transmitter with a radiating transducer; a resolver with two ortho... | 12/15/1981 |
| 4219885 | Sonar target simulator 1. A system for simulating wave reflections from an irregular-shaped moving bject which has been illuminated with energy of frequency F, said system comprising; a receiver (10) for said frequency F; a generator (14) of white noise voltage; means (13) for amplit... | 08/26/1980 |
