David A Costa

US Patent:

58286250, Oct 27, 1998

Filed:

Oct 9, 1997

Appl. No.:

8/954884

Inventors:

David R. Costa - Taunton MA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H04B 1700

US Classification:

367 13

Abstract:

A target echo simulator with reverberation and ambient noise for testing an ctive sonar system. A transmit enable pulse from a sonar transmitter establishes a sequence of operations in which a target echo generator, reverberation generator and ambient noise generator produce a composite signal. The target echo generator produces a pulse modulated output pulse of a characteristic sonar frequency. The reverberation generator produces an amplitude modulating or envelope controlled output at a frequency of a carrier that is offset from the target echo carrier frequency. An ambient noise generator constantly produces ambient noise. A summing amplifier combines the generated signals to produce a composite signal for transfer to a receive connection on the active sonar system.

US Patent:

61575933, Dec 5, 2000

Filed:

Jan 14, 1999

Appl. No.:

9/252243

Inventors:

David R. Costa - Taunton MA
Seth B. Suppappola - North Kingstown RI

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H04B 102

US Classification:

367137

Abstract:

A power envelope shaping device for joining to a serial control output is sclosed. Multiple power switcher modules are joined to a plurality of incremental power sources and controlled by the power select circuitry module. In this way, each power switcher module can provide power from at least one of the incremental power sources on command from said power select circuitry module. The power switcher module outputs are joined together in order for providing varying power levels in accordance with a preprogrammed power envelope shape.