Raytheon Company

Michael D Petito

Peter Redes

A time multiplexer for linking a trigger signal, a video signal, and data signals generated by a radar transceiver to a radar display. The multiplexer is particularly useful when the transceiver is located remotely from the display, such as is commonly encountered in commercial marine radars. The multiplexer provides a multiplexed signal having a first trigger portion with a logic high voltage, followed by a unipolar video portion having a maximum voltage less than the logic high voltage. The video portion is immediately followed by a data portion that is also unipolar but with a polarity opposite that of the video portion. Detection of the data portion may be expedited by including a synchronization preamble. The multiplexer makes efficient use of a link between radar transceiver and radar display by using a pulse repetition frequency output of the transceiver to select which of the trigger, video, or data signals is to be sent at a particular time. Appropriate detection circuits for providing a reconstructed trigger, video, and data signal at the display are also disclosed. A synchronous detector and error circuits are also described.

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Goffstown, NH, United States of America

Michael D Petito