Abstract: A monopulse secondary surveillance radar is configured to integrate replies to active interrogations and passive squitter reception into a single surveillance system, and includes: a three-channel antenna arrangement; a redundant ADS-B antenna arrangement including a first and second omnidirectional ADS-B antenna, each having a low noise amplifier, and each being integrated with a GPS antenna; and a pair of redundant four-channel interrogators. The three-channel antenna arrangement is configured to transmit interrogations, and to receive corresponding replies from an aircraft transponder. The first ADS-B antenna is coupled to a first of the pair of redundant four-channel interrogators, and the second ADS-B antenna is coupled to a second of said pair of redundant four-channel interrogators, for the monopulse secondary surveillance radar to provide real-time passive detection of ADS-B-equipped aircraft and active radar detection of aircraft to each of the pair of redundant four-channel interrogators.

Abstract: A stacked electronic arrangement provides independent upgradability of active component boards and radiator boards, enabling quick changes in chip set and alternate polarizations, and includes: an active tile circuit card assembly (CCA); a passive radiator CCA; a tile frame; and a heat exchanger. The active tile CCA includes transmit/receive modules that accept, amply and transmit radar signals. The passive radiator CCA includes patch radiator plugins that receive and then radiate the amplified signal from the modules. The tile frame separates the active tile and the passive radiator CCAs. An elongated casing of the heat exchanger creates an accommodating space for air flow, and forms a first inlet, a second inlet, and a central exhaust plenum between the first and second inlets. High density fins are positioned within the accommodating space between the first and second inlets, and which have openings to the exhaust outlet.

Abstract: A stacked electronic arrangement provides independent upgradability of active component boards and radiator boards, enabling quick changes in chip set and alternate polarizations, and includes: an active tile circuit card assembly (CCA); a passive radiator CCA; a tile frame; and a heat exchanger. The active tile CCA includes transmit/receive modules that accept, amply and transmit radar signals. The passive radiator CCA includes patch radiator plugins that receive and then radiate the amplified signal from the modules. The tile frame separates the active tile and the passive radiator CCAs. An elongated casing of the heat exchanger creates an accommodating space for air flow, and forms a first inlet, a second inlet, and a central exhaust plenum between the first and second inlets. High density fins are positioned within the accommodating space between the first and second inlets, and which have openings to the exhaust outlet.

Abstract: A system for determining a location in a disadvantaged signal environment includes three aerial vehicles hovering at high altitude and spaced apart to form a triangle, and a mother aerial vehicle positioned a distance away and at a lower altitude. The mother aerial vehicle acquires and transmits coarse geolocation information, using a pulse compression, high-power X Band radar and directional antenna, to each of the three aerial vehicles to direct them to coarse geo-positions above designated respective ground locations. One of the three aerial vehicles has a synthetic aperture radar for producing a terrain strip-map that is mensurated against a map database to provide fine position adjustments for each of the three aerial vehicles, which are also also configured to transmit a respective signal coded with its latitude, longitude, and altitude, for a computing device to perform time difference of arrival measurements of the signals to determine its location.

Abstract: A stacked electronic arrangement provides independent upgradability of active component boards and radiator boards, enabling quick changes in chip set and alternate polarizations, and includes: an active tile circuit card assembly (CCA); a passive radiator CCA; a tile frame; and a heat exchanger. The active tile CCA includes transmit/receive modules that accept, amply and transmit radar signals. The passive radiator CCA includes patch radiator plugins that receive and then radiate the amplified signal from the modules. The tile frame separates the active tile and the passive radiator CCAs. An elongated casing of the heat exchanger creates an accommodating space for air flow, and forms a first inlet, a second inlet, and a central exhaust plenum between the first and second inlets. High density tins are positioned within the accommodating space between the first and second inlets, and which have openings to the exhaust outlet.

Abstract: A bidirectional integrated CMOS switch is provided which is capable of switching voltages beyond the range of the supply and ground potentials. The switch is composed of NMOS and PMOS transistors as the switch conductor path, a diode bridge, and control circuitry to turn the switch on and off by means of low voltage logic, regardless of the voltages on the switch terminals. The device and method of the invention enables the switching of high voltage loads operating at arbitrary or floating voltages relative to the low voltage power supply and ground, and provides on/off control of the switch with ordinary low voltage logic levels. The invention provides bidirectional switching without conducting through the parasitic body diodes of the CMOS devices.

Abstract: A bidirectional integrated CMOS switch is provided which is capable of switching voltages beyond the range of the supply and ground potentials. The switch is composed of NMOS and PMOS transistors as the switch conductor path, a diode bridge, and control circuitry to turn the switch on and off by means of low voltage logic, regardless of the voltages on the switch terminals. The device and method of the invention enables the switching of high voltage loads operating at arbitrary or floating voltages relative to the low voltage power supply and ground, and provides on/off control of the switch with ordinary low voltage logic levels. The invention provides bidirectional switching without conducting through the parasitic body diodes of the CMOS devices.

Abstract: A bidirectional integrated CMOS switch is provided which is capable of switching voltages beyond the range of the supply and ground potentials. The switch is composed of NMOS and PMOS transistors as the switch conductor path, a diode bridge, and control circuitry to turn the switch on and off by means of low voltage logic, regardless of the voltages on the switch terminals. The device and method of the invention enables the switching of high voltage loads operating at arbitrary or floating voltages relative to the low voltage power supply and ground, and provides on/off control of the switch with ordinary low voltage logic levels. The invention provides bidirectional switching without conducting through the parasitic body diodes of the CMOS devices.

Abstract: A bidirectional integrated CMOS switch is provided which is capable of switching voltages beyond the range of the supply and ground potentials. The switch is composed of NMOS and PMOS transistors as the switch conductor path, a diode bridge, and control circuitry to turn the switch on and off by means of low voltage logic, regardless of the voltages on the switch terminals. The device and method of the invention enables the switching of high voltage loads operating at arbitrary or floating voltages relative to the low voltage power supply and ground, and provides on/off control of the switch with ordinary low voltage logic levels. The invention provides bidirectional switching without conducting through the parasitic body diodes of the CMOS devices.

Abstract: A bidirectional integrated CMOS switch is provided which is capable of switching voltages beyond the range of the supply and ground potentials. The switch is composed of NMOS and PMOS transistors as the switch conductor path, a diode bridge, and control circuitry to turn the switch on and off by means of low voltage logic, regardless of the voltages on the switch terminals. The device and method of the invention enables the switching of high voltage loads operating at arbitrary or floating voltages relative to the low voltage power supply and ground, and provides on/off control of the switch with ordinary low voltage logic levels. The invention provides bidirectional switching without conducting through the parasitic body diodes of the CMOS devices.

Abstract: An improved counterflow heat exchanger is described. The heat exchanger has one or more cold air intake passageways and one or more hot air intake passageways wherein the flow of cold air is opposite the flow of hot air. In addition, each cold air intake passageway contacts at least one hot air intake passage way.

Abstract: A multi-point communications system joins a series of communications units in a series chain while providing communications between and among all of the units. Each communication unit comprises a pair of frames, preferably operating under E1/T1 protocols connected in a back-to-back arrangement through the framers' local serial busses. Communication data is placed on and extracted from a designated set of channels on the serial busses while preamble data, controlling the passage and routing of the communications data, is placed on a separate set of bus channels. One of the interconnected communications units is designated as the “parent”, and provides supervisory control over communications data, timing and flow. Designation of the parent unit may be performed on a dynamic basis to allow the communications system to dynamically adapt to changes in system size as communications units are added or dropped.

Abstract: The present invention is primarily directed to rail car communication system and in particular communication system used to transfer data and voice communications from one car to another. The present invention has particular applicability for use in subway cars. A communication system using an E1 protocol is provided with an interface device which translates data received from a hardware device having, inter alia, a microprocessor and a universal asynchronous receiver transmitter (UART) used for serial communications such as COM 1-4. The asynchronous UART data is interfaced with the E1 channel. UART data transfers are usually done on a byte (8 bits) by byte basis but the present invention uses E1 timing and bit by bit communications. Additionally, data is normally sent at the data rate of the E1 channel not some other unrelated speed such as those used by a UART during serial communications. Also, the data is usually sent synchronously, like the E1 channel, not asynchronously, as with a UART.

Abstract: An improved garage door opener is disclosed. The garage door opener has a motor drive unit for opening and closing a garage door. The motor drive unit has a microcontroller. Connected to the motor drive unit is a wall console that resides inside the garage. The wall console also has a microcontroller. The microcontroller of the motor drive unit is connected to the microcontroller of the wall console by means of a digital data bus.

Abstract: A personal alarm monitor system provides for the recording of a record of locations of a person as the person travels through a designated premises having a series of designated areas interconnected by portals or gateways, such as doorways. The person carries a receiver capable of receiving broadcasts from a series of preferably low-power transmitters specifically located throughout the premises. Pairs of transmitters are located at each gateway, one transmitter being placed in each of the adjacent designated areas to broadcast a signal primarily into the designated area about the gateway. Additional unpaired transmitters may be located at additional locations in the designated areas. Each transmitter is assigned and broadcasts a unique code corresponding to its location and status as either a gateway or non-gateway tag.

Abstract: An improved switching power supply includes a variable frequency switching circuit. The frequency of the switching circuit is varied to minimize interaction between generated power supply noise and an electronics device powered by the power supply. The operating frequency or frequencies of the powered electronics device are monitored to allow continuous real time control over the switching circuit frequency to be provided.

Abstract: A wireless communication system allow two-full two-way communication among a net or loop of stations. Each station is in direct communication with another member of the net such that a logical communication loop is created about the net. Each station combines its received signal with its own audio signal for retransmission to the next member of the loop whereby audio from said station is passed in turn to each of the other loop members. Transmission frequency hopping is utilized to insure system privacy and minimize interference with or from other loops operating in the same area. The system dynamically reconfigures itself to allow for the addition or dropping of a station without breakdown of the loop.

Abstract: An electronic voice recognition system utilizes a microphone having noise-cancelling characteristics and a standardizer network to achieve further noise reduction and signal standardization over a range of input levels. The output of the standardizer is coupled to voice processor circuitry which provides a computer-compatable output corresponding to the voice information received. The system may be embodied in a multi-station environment in which the voice reception stations are coupled to a remote central processing location. A variety of processing techniques, including analog and digital, parallel and sequential, may be utilized to pass the voice signals to the processors. Upon successful processing, a confirmation signal is passed to the appropriate voice-originating station.

Abstract: A lightweight piezoelectric microphone using a metallized piezoelectric diaphragm arcuately bowed by a boss on a slotted baffle plate held in close parallel proximity to the diaphragm is disclosed. Slotted Helmholtz resonators provide frequency response shaping and wide band noise cancellation. Electrical contact between the diaphragm and an electrical conductor is provided by a conductive, elastic material compressed by parts of the microphone housing, into electrical contact with the conductor and a metallized side of the diaphragm.