Communications: directive radio wave systems and devices (e.g. – Radar transponder system
Patent
1995-02-15
1996-04-09
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
342 44, 342 51, 34082534, 34082554, G01S 1376
Patent
active
055065848
ABSTRACT:
A radar sensor/processor for intelligent vehicle highway systems. The radar sensor/processor provides the range, speed, identity of, and selective communications with, vehicles equipped with a transponder in a first cooperative interrogator/transponder mode, and provides information on the range and speed of vehicles without a, or with an inoperative, transponder in a second noncooperative mode. The interrogator includes a first direct digital synthesizer, with an associated first input binary tune register, for producing a sine wave output, a multiplier for multiplying the sine wave output to produce an X-band signal, and a bi-phase single sideband modulator which modulates the X-band signal with data to be transmitted. The interrogator receiver receives a returned transponder reply signal, and includes a balanced mixer for downconverting the reply signal. A down-converted carrier signal is extracted, and is an input to a control loop which includes a second direct digital synthesizer, its associated second input binary tune register, a phase detector, and an A/D converter. The control loop rapidly adjusts the count in the second binary tune register to bring the output frequency of the second direct digital synthesizer into exact correspondence with the down-converted carrier signal. A subtraction of the respective counts in the input binary tune registers for the first and second direct digital synthesizers is a measure of the vehicle speed.
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Anderson Terry J.
Hoch Jr. Karl J.
Northrop Grumman Corporation
Sotomayor John B.
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