Raytheon Company

Richard B Watson, Jr

Theodore J Peregrim

Nathan Slawsby

Edward J Sheldon

An AWTSS is shown to be made up of an improved synthetic aperture radar (SAR) for generating radar maps with various degrees of resolution required for navigation of an aircraft and detection of ground targets in the presence of electronic countermeasures and clutter. The SAR consists, in effect, of four frequency-agile radars sharing quadrants of a single array antenna mounted within a radome of a 'four axis' gimbal with a sidelobe cancelling subarray mounted at the phase center of each quadrant. Motion sensors are also mounted on the single array antenna to provide signals for compensating for vibration and stored compensating signals are used to compensate for radome-induced errors. In addition, a signal processor is shown which is selectively operable to generate radar maps of any one of a number of desired degrees of resolution, such processor being adapted to operate in the presence of clutter or jamming signals.

All weather tactical strike system (AWISS) and method of operation

A field effect transistor (FET) logic gate wherein a plurality of FETs is coupled to an output enhancement mode FET through a noise immunity circuit, such noise immunity circuit including a Schottky diode. A biasing network ensures that any conducting one of the input transistors produces a forward voltage drop between its input and output less than the forward drop of the Schottky diode circuit ensuring that the voltage at the gate electrode of the output transistor is less than the threshold voltage of such output transistor in the presence of noise. In one embodiment the logic gate includes a coupling FET having a gate electrode coupled to the gate electrode of the output transistor through the noise immunity Schottky diode circuit, and a source electrode coupled to the plurality of input transistors. A first current source is coupled to the gate of the coupling transistor and thereby provides a sufficient voltage to drive the output transistor into full conduction when the input transistors are in low conduction states. A second current source is coupled to the drain electrode of the coupling transistor and supplies a predetermined amount of current to a conducting one, or ones, of such input transistors. The current supplied by the second current source is determined in accordance with the fan-out requirements of the logic gate and is independent of a bias voltage provided by the first current source at the gate electrode of the output transistor to place the output transistor into full conduction.

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Acton, MA, United States of America

Richard B Watson, Jr