Radar system employing injection locked transmitter stage
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United States of America Patent
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-
Apr 21, 1992
Grant Date -
N/A
app pub date -
Nov 27, 1989
filing date -
Nov 7, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A radar transmitter chain employing injection locked oscillator, e.g., a magnetron, as an output stage. Problems arise with maintaining the injection locking bandwidth centered on the radar source transmit frequency. This alignment is maintained by allowing the magnetron (38) free running frequency to drift, along with its injection locking bandwidth and then to force the radar source frequency (30) to follow the magnetron frequency. A phase difference measurement (44) between the injection signal (35) and the magnetron output signal (37) provides the control for a feedback loop (60) which may control a tunable VCO (48) or selection from a bank of fixed frequency oscillators (78).
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