Abstract: A method and apparatus are provided for detecting an intruder. The method includes the steps of receiving an echo from opposing sides of a curtain line extending through the secure area, determining a difference between the received echoes, determining a phase difference of the signal and generating an alarm when the determined phase changes sign between successively received echoes.

Abstract: The present invention is an alarm system that includes a dual technology motion sensor. The dual technology sensor includes a PIR sensor with a PIR detection pattern and a Doppler microwave frequency motion detector with a detection pattern wider than that of the PIR sensor. The microwave detector's processing circuitry distinguishes motion beyond the PIR detection pattern, and limits the microwave detector's field of view to match the PIR detector's detection pattern. The microwave detector has a transmitting antenna, two receiving antennas, and processing circuitry for processing received signals. The microwave detector's processing circuitry uses phase information from the two receiving antennas to distinguish motion beyond the PIR detection pattern.

Abstract: A method and apparatus are provided for detecting an intruder. The method includes the steps of receiving an echo from opposing sides of a curtain line extending through the secure area, determining a difference between the received echoes, determining a phase difference of the signal and generating an alarm when the determined phase changes sign between successively received echoes.

Abstract: The present invention is an alarm system that includes a dual technology motion sensor. The dual technology sensor includes a PIR sensor with a PIR detection pattern and a Doppler microwave frequency motion detector with a detection pattern wider than that of the PIR sensor. The microwave detector's processing circuitry distinguishes motion beyond the PIR detection pattern, and limits the microwave detector's field of view to match the PIR detector's detection pattern. The microwave detector has a transmitting antenna, two receiving antennas, and processing circuitry for processing received signals. The microwave detector's processing circuitry uses phase information from the two receiving antennas to distinguish motion beyond the PIR detection pattern.

Abstract: A method for executing trusted commands, in which a trusted command is first received from a user at a user terminal and parsed by untrusted code; then passed to a trusted computing base for execution. The trusted computing base displays some indication of what is to be done back to the user for confirmation. Confirmation of the commands prevents unauthorized modification of the commands and increases system confidence. A randomly (or pseudo-randomly) generated process identifier is employed to verify the existence of a trusted path.

Abstract: A monitoring apparatus is included in each street light of a plurality of street lights. Each monitoring apparatus monitors the operation of the associated street lamp and stores data representing the operation thereof. Data is sent from each monitoring apparatus to a monitoring station, via the power supply cables connected to the street lamps, under control of the monitoring station. The monitoring station stores the data until it is requested to transfer the data to an interrogating station. The data is then analysed to identify faulty street lights.

Abstract: Disclosed is a method for providing electronic semiconductor devices and the devices produced thereby utilizing an orientation dependent etch to selectively provide grooves in a monocrystalline silicon substrate having a crystal orientation of (110). By selectively etching with an orientation dependent etch to provide deep grooves having substantially parallel sidewalls and thereafter refilling with an appropriate material of the appropriate conductivity, a plurality of semiconductor electronic devices are provided.

Abstract: Disclosed is a method of fabricating a vertical multi-junction cell and the solar cell produced thereby, utilizing an orientation dependent etch to selectively provide parallel grooves in monocrystalline silicon body, followed by the introduction of doping impurities of the opposite conductivity type from the silicon body to provide PN junctions. In some instances the grooves are filled with silicon of the same conductivity type as the silicon body.

Abstract: The disclosure relates to the formation of very thin silicon slices, 1/10 of a mil, and the mechanical strengthening of such thin silicon slices and to the formation of electronic circuitry in such slices and the use thereof. These slices are formed, in accordance with one embodiment of the invention, by etching grooves in an n+ wafer using an orientation dependent etch and etching along the {111} plane in {110} n+ wafers. After oxide removal, the surface of the wafer opposite the grooves is epitaxially coated with n-type silicon and the original grooves are then further etched by an electrolytic etch or by a concentration dependent etch which will remove only the n+ material, thereby leaving the thin wafer with a honeycomb-like supporting structure with struts in the shapes of parallelograms, diamonds and the like.