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1. (WO1997008567) DIGITALLY PROGRAMMABLE RADIO MODULES FOR TRANSPONDER SYSTEMS

Pub. No.:    WO/1997/008567    International Application No.:    PCT/US1996/014162
Publication Date: Mar 6, 1997 International Filing Date: Aug 30, 1996
IPC: G01S 13/74
H03D 7/16
H04B 1/04
H04B 1/26
H04B 1/40
Applicants: NORTHROP GRUMMAN CORPORATION
Inventors: PHILLIPS, William, C.
PASCALE, Michael, V.
MINARIK, Ronald, W.
SCHMIDT, Kenneth, M.
Title: DIGITALLY PROGRAMMABLE RADIO MODULES FOR TRANSPONDER SYSTEMS
Abstract:
A programmable digital radio is configured to perform transponder functions. A receiver in the programmable digital radio receives analog signals from an interrogator and digitize the analog signals to produce digital interrogation signals. The digital interrogation signals are processed digitally and valid interrogations are detected. Processing includes detection of pulses, determination of each pulse's threshold; determination of intervals between pulses and whether the intervals meet mode criteria; and determination of priority of output of digital messages encoded in the pulses. At least one message is supplied to a transmit module in the programmable radio. The transmit module performs diversity processing on the received message to determine to which received signal to reply, produces reply data and modulates the reply data to produce intermediate frequency signals. The intermediate frequency signals are then converted to analog signals which are transmitted to the interrogator.