Communications: directive radio wave systems and devices (e.g. – Clutter elimination
Patent
1997-09-15
1999-08-17
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Clutter elimination
342175, 342100, 342102, 330 2, 330 43, G01S 7292, G01S 740
Patent
active
059400250
ABSTRACT:
A radar transmitter for producing a radar signal in response to a radar trigger signal fed thereto. The transmitter includes a radio frequency oscillator for producing a signal having a radio frequency carrier to be used in each transmitted radar signal. The signal produced by the oscillator is amplified by a radio frequency amplifier. In response to the system trigger signal, the transmitter is configured in a normal operating mode to operate with three noise cancellation loops; i.e., an automatic level control loop (ALC); an amplitude modulation noise cancellation loop (AM noise cancellation loop); and a phase modulation noise (PM noise cancellation loop). In response to the system trigger signal, the normal operating mode is preceded with two calibration modes: an AM noise calibration mode used to determine a nominal operating point for the AM noise calibration mode; and a subsequent phase modulation (PM) noise calibration mode used to establish a nominal operating point for the PM noise calibration mode. During the AM noise calibration mode, a nominal operating level is determined which places the TWT amplifier slightly below saturation.
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Koehnke Mark A.
Melick W. Roger
Plutchak Raoul E.
Rego Stephen
Santangelo Steve B.
Raytheon Company
Sotomayor John B.
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