Abstract:
An E-field sensing system (16, 18, 26, 28) is provided to detect the presence of obstacles (14), including wires, power lines or trip wires, as well as towers, guy wires, buildings and elevated terrain, in which a variation or tilt of the iso-potential electrostatic field adjacent the obstacle (14) is detected. In one embodiment the bearing to the obstacle (14) is ascertained. The result is the detection of power lines (14) from as far away as at least 1,000 feet and unpowered wires from as far away as at least 100 feet, thus reducing pilot anxiety for low level missions as well as providing for wire strike avoidance.
Abstract:
A pseudomorphic-high-electron-mobility-transistor (PHEMT) includes a substrate, a low-temperature-grown (LTG) GaAs gate-insulator layer disposed on the substrate, and a gate electrode disposed on the gate-insulator layer.
Abstract:
A sensor is provided for analyzing an object at a focal point of a lens. The sensor includes a focused radiant energy source directed at the lens. The focused radiant energy source transmit a first beam of energy to the lens, vaporizing a portion of the object at the focal point of the lens. A second beam of energy is emitted from the vaporization of the object. A spectrometer is positioned to receive the second beam of energy emitted from the object. The second beam of energy is at least partially transmitted anti-parallel to the first beam of energy.
Abstract:
In the invention, a four-port junction (10) has a port (12) connected to an RF signal source (14). The four-port junction (10) also has an antenna port (16) coupled to a combined transmit/receive antenna (18). Two ports (20, 22) of the four-port junction (10) develop output power that is applied to an analogue-to-digital converter (24), that is in turn coupled to a central processor (26), that is in turn coupled to a user interface (28).
Abstract:
A sense amplifier for static random access memories is disclosed. The sense amplifier includes a pair of inverters cross-coupled to each other. The sense amplifier also includes means for equalizing the charges within the pair of inverters before performing a sense operation, and means for sensing a current difference between a bitline and its complement from a memory cell during the sense operation.
Abstract:
A carry/majority circuit, comprising a plurality of differential transistor pairs coupled in parallel and forming a pair of output nodes, with a single parallel gated level. Current is steered through a leg of the transistor pair having a higher input voltage.
Abstract:
A method includes precharging a first dynamic node, precharging a second dynamic node, and maintaining a first logic state of a signal on the first dynamic node responsive to a second logic state of a signal on the second dynamic node. The method further includes maintaining the second logic state of the signal on the second dynamic node responsive to the first logic state of the signal on the first dynamic node.
Abstract:
It has been found that target optics produce non-specular, augmented optical returns when interrogated by a laser pulse. This non-specular radiation is detected by an active laser search system employing a direct-reading, thresholded focal plane detector that is able to detect non-cooperating targets with optics that employ a detector or optical element at the focal plane of their receiving optics. The pulses returned from such target optics have a width commensurate with the original transmitted pulse width, whereas passive background noise and the spread out active returns from the ground exhibit temporally long returns. By setting the sensor threshold sufficiently high, the system discriminates against noise and clutter while at the same time reducing the number of sweeps required to detect a target within the search area.
Abstract:
The present invention relates to an optical modulator array that uses stepped-well continuously tunable quantum well infrared modulators in order to accomplish electronic beam modulating. The present invention involves a coherent optical beam modulating device to steer an optical beam comprising: an optical modulator array, where said optical modulator array includes a stepped quantum well doped with electrons, wherein the modulator array affects operates as at least one of a phase modulator and a light intensity modulator base upon a voltage bias applied across the modulator array. The continuous tunable quantum well modulator includes asymmetry of the unit cell that allows transitions from the ground state to the second excited state that are normally forbidden in symmetrical quantum well infrared photodetectors.