摘要:
A method for operating a train having at least one locomotive vehicle, the method including controlling operation of the train via a first crew member located on-board the locomotive unit, providing information that may be required for operation of the train to a second crew member located remote from the first crew member, and using the information to enable the second crew member to assist the first crew member in the controlling of the train.
摘要:
A system for remote control of an electrically operated railroad wayside equipment having a power supply for powering the wayside equipment. a central controller provides central control signals. A transmitter associated with the controller receives the control signals and transmits communications signals corresponding to the control signals. A remote equipment controller controls operation of the wayside equipment in response thereto.
摘要:
A method of distributing wide band data using a neutral-to-ground circuit within an electrical wiring installation includes modifying a load center with an interface module which interfaces to the neutral-to-ground circuit and configuring the interface module to compensate for varying impedance within the neutral-to-ground circuit to improve data transmission characteristics. Multiple embodiments are included within the method for compensation of varying impedance including channel sounding, spectral waterfilling, and communications using spread spectrum techniques, for example, frequency hopping and direct sequencing techniques.
摘要:
Apparatus for monitoring the health and response of critical electromechanical control valves to detect the likelihood of future valve malfunction includes the use of Fourier transform decomposition and time-domain wavelets to selectively enhance portions of the valve response signal for comparison with a normal valve response signal.
摘要:
A spatial synchronization method for an optical communications system includes the step of transmitting from a transmit aperture a pyramidal synchronizing profile so as to sequentially spatially register a user identification speckle pattern at a receive aperture. The iterative patterns in the pyramidal synchronizing profile detected by the receive array are processed and correlated with a library of respective user pyramidal synchronizing profiles so as to match and register the speckle pattern for a particular user. Registration of the user speckle pattern provides an offset value representing the spatial relation of a reference point of the user's pattern to a corresponding reference point of the receive aperture, which offset information is applied to a receive pattern processor so that the receive aperture is aligned with the transmitted speckle patterns.
摘要:
A set of phases defining an `address` and a `spreading key` is selected. These are employed in determining a preamble waveform and a traffic waveform. The preamble carrier waveform is a sum of a set of tones each offset by its phase, whereas the traffic carrier waveform is the product of these same offset tones. The tones have frequencies which are geometrically increasing multiples of a fundamental frequency. The phases and magnitudes of the preamble and traffic carrier waveforms are determined and prestored in a transmit and receive unit storage device. An inverse discrete Fourier Transform unit (IDFT) in the transmit unit receives the phase preamble offsets and magnitudes from the storage unit and creates a preamble carrier signal transmitted to the receive unit which determines if the phases match those which it is to listen to. If not, the following message is ignored; if they are, the following message is despread and decoded. IDFT creates a traffic carrier waveform from the traffic phases and magnitudes. Binary information is encoded in the carrier, processed and transmitted to the receive unit. A discrete Fourier Transform unit converts the received signal into phases and magnitudes. A dot product unit determines a dot product of the phase and magnitudes of the received signal and the traffic carrier waveform over a number of frequencies. A decision unit determines a binary message from the dot product.
摘要:
An alternating current sensor employing a mutually-inductive current sensing scheme comprises a conductive pipe and a cylindrical-shaped conductive element at least partially surrounded by the pipe. The pipe is substantially concentric to the conductive element and a conductor electrically connects a pair of corresponding ends of the pipe and conductive element to form a connected conductive path through the sensor. The conductive element may include a passage or opening shaped to form a magnetic field within the passage during current flow along the conductive path.
摘要:
In one embodiment, the present invention is an encryption/decryption and authentication algorithm. The algorithm has three major steps. The first step is generating cipher text. The second step is generating the authentication field. The third step is encrypting or deciphering the appropriate data in the message. One byte of cipher text is generated for every byte of plain text contained in the message. After all the cipher text is generated, a four byte authentication field is generated using the last four bytes of cipher text. The message is then scanned for data fields which have been encrypted or are to be encrypted and the corresponding byte of cipher text replaces the message bytes. The encryption is accomplished by sending the cipher text instead of message text. To decipher the message, the algorithm operates in a reverse mode to replace the cipher text with the message text, i.e., the algorithm is a self-reversing process.
摘要:
Various embodiments of a device, system and methods that promote safety and security within an organization. Sensor data from one or more installation sensors is collected, analyzed and used to create a map and/or directions that, when received by a wireless mobile device, facilitate a person's possible egress around or from a detected event. The information provided to the person by the map and/or the directions may be individually crafted to be of maximum use to the specific recipient so the person can understand, plan and execute the most appropriate danger avoidance maneuvers in minimal time.
摘要:
Methods, systems, and apparatus for controlling a turbine clearance in an aircraft engine are provided. A method includes activating a turbine clearance control based on a flight phase of an aircraft using the aircraft engine, and adjusting the turbine clearance based on a preselected turbine clearance value.