Abstract: The invention relates to methods and systems for accurate ranging and geo-locationing using coherent multicarrier (CM) signals and based on a high-resolution estimation of a receiver timing offset in a signal receiver that receives ranging CM signals. A transmitter transmits a ranging CM signal having a known subcarrier modulation pattern. The receiver samples the ranging CM signal it receives reflected back from an object or from the remote transmitter, and processes the sampled signal that preserves relative subcarrier phases using a high-resolution model channel response function to determine the receiver timing offset with resolution much better than the receiver sampling period. The receiver timing offset is used to determine a flight time for the ranging CM signal with high accuracy.

Abstract: The invention relates to methods and systems for accurate ranging and geo-locationing using coherent multicarrier (CM) signals and based on a high-resolution estimation of a receiver timing offset in a signal receiver that receives ranging CM signals. A transmitter transmits a ranging CM signal having a known subcarrier modulation pattern. The receiver samples the ranging CM signal it receives reflected back from an object or from the remote transmitter, and processes the sampled signal that preserves relative subcarrier phases using a high-resolution model channel response function to determine the receiver timing offset with resolution much better than the receiver sampling period. The receiver timing offset is used to determine a flight time for the ranging CM signal with high accuracy.

Abstract: A system and method establishes the time of flight and thereby distance between two transceivers on various media, including but not limited to vacuum, air, electrical wire, optical fiber; using carrier waves sent from one or more transmitters or transceivers to one or more receivers or transceivers. Carriers are arranged to allow the extraction of channel information and maintain acceptable peak to average ratios in an OFDM system.

Abstract: A control system for driving a power tool is provided comprising a power source, a motor adapted to drive a shaft, a power switching unit interconnecting the power source and the motor, and a controller. The power switching unit applying a pulse width modulated (PWM) drive signal from the power source to the motor. The controller monitoring at least one electrical characteristic of at least one of the power source, motor and power switching unit and adjusting the operating duty cycle of the PWM drive signal based on the electrical characteristics.

Abstract: An air flow detecting system is provided for monitoring air flow in a dryer system. The dryer system has an exhaust passage through which air from a drying compartment flows. The air flow detecting system includes a detector for monitoring a rate at which air from the drying compartment travels through the exhaust passage, and a signal generator. The signal generator is responsive to the detector and generates an electrical signal for which at least one of phase, frequency, voltage, or current varies over a continuous range based on a measured flow rate.

Abstract: An air flow detecting system is provided for monitoring air flow in a dryer system. The dryer system has an exhaust passage through which air from a drying compartment flows. The air flow detecting system includes a detector for monitoring a rate at which air from the drying compartment travels through the exhaust passage, and a signal generator. The signal generator is responsive to the detector and generates an electrical signal for which at least one of phase, frequency, voltage, or current varies over a continuous range based on a measured flow rate.

Abstract: A control system for driving a power tool is provided comprising a power source, a motor adapted to drive a shaft, a power switching unit interconnecting the power source and the motor, and a controller. The power switching unit applying a pulse width modulated (PWM) drive signal from the power source to the motor. The controller monitoring at least one electrical characteristic of at least one of the power source, motor and power switching unit and adjusting the operating duty cycle of the PWM drive signal based on the electrical characteristics.

Abstract: A high performance modular connector system includes a plug and a jack both arranged for high frequency data transmission. The plug is constructed for coupling in a mating arrangement with the jack both including a plurality of contacts arranged to provide conductive paths for carrying a high-frequency data signal. The connector system includes several counter-coupling or compensation structures, each having a specific function in cross-talk reduction. The compensation structures are designed to offset and thus electrically balance frequency-dependent capacitive and inductive coupling. One important type of the compensation structure is located near contact points forming the conductive paths between connector terminals of the jack and connector terminals of the plug. This compensation structure is conductively connected to at least some of the contacts and is located outside the conductive path carrying the high-frequency data signal.

Abstract: A method and apparatus for adjusting the coupling reactances between twisted pairs contained within a data communications cable is disclosed. An isolation element is used to isolate one or more twisted pairs of wires from the other twisted pairs of wires contained within the data communications cable. The isolation element may be constructed of dielectric, conductive, or ferromagnetic materials or a combination thereof. It may also include various shapes, patterns, and/or windows for creating a specified level of crosstalk among the twisted pairs contained within the cable.

Abstract: A fixture is provided adjacent to a cable containing multiple twisted pairs. The fixture includes longitudinal channels for controlling the trajectory of the wire pairs after the twisted pairs have been exited the cable and have been detwisted. The fixture maintains the wire pairs in an orientation beneficial for reducing crosstalk.

Abstract: A method and apparatus for adjusting the coupling reactances between twisted pairs contained within a data communications cable is disclosed. An isolation element is used to isolate one or more twisted pairs of wires from the other twisted pairs of wires contained within the data communications cable. The isolation element may be constructed of dielectric, conductive, or ferromagnetic materials or a combination thereof. It may also include various shapes, patterns, and/or windows for creating a specified level of crosstalk among the twisted pairs contained within the cable.

Abstract: A method and apparatus for adjusting the coupling reactances between twisted pairs contained within a data communications cable is disclosed. An isolation element is used to isolate one or more twisted pairs of wires from the other twisted pairs of wires contained within the data communications cable. The isolation element may be constructed of dielectric, conductive, or ferromagnetic materials or a combination thereof. It may also include various shapes, patterns, and/or windows for creating a specified level of crosstalk among the twisted pairs contained within the cable.

Abstract: Methods and apparatus, including a concentrator, for operating a station coupled to a ring in a token ring network. The ring carries signal at an active monitor clock rate. The method includes the steps of generating a local clock at an accelerated clock rate that is equal to or greater than the active monitor clock rate, operating the station at the accelerated clock rate when the station is a standby monitor, operating the station at the active monitor clock rate when the station is the active monitor, operating the station at its own clock rate when the station is in loopback mode, and receiving signal from the ring and transmitting signal to the ring at the active monitor clock rate. The station operates at the accelerated clock rate of the local clock except when the station is the active monitor or is in loopback mode.