Abstract: The present invention relates to a circuit structure for realizing real-time pre-distortion calibration of broadband IQ modulation, comprises a baseband generation module, for the calibration signal generator to generate two orthogonal sine cosine calibration signals respectively according to the calibration bandwidth and the order of the pre-distortion filter, and the data switch is switched to the relevant data channel; a digital-to-analog conversion module, for converting the signals into analog I and Q baseband signals; a frequency synthesis module, for generating signals in a certain frequency range; a IQ modulation module, for mixing the analog baseband signal with the local oscillator signal; an amplitude control module, for continuous adjustment of the RF signal power. The present invention also relates to a method for realizing real-time pre-distortion calibration processing of broadband IQ modulation.

Abstract: A method for realizing predistortion compensation processing for 5G NR in-band modulated signals includes configuring the modulator to output a continuous wave signal, switch the output frequency interval of the signal to be consistent with the 5G NR subcarrier bandwidth, and record the power value P0 corresponding to the current frequency through the power meter. The power measurement difference between all points and P0 is calculated and performs normalization, and generates a compensated channel impulse response after shaping filtering; converts it into a power compensation factor in the time domain; performs inverse Fourier transform to generate I and Q baseband signals; generates compensated baseband data; the generated baseband data is filtered, and an analog zero intermediate frequency signal is generated, which is input to the broadband demodulator for frequency conversion modulation of the 5G NR broadband signal. The method operates without the need to modify the device circuit in the channel.

Abstract: A method for accurate fault location in a multi-type cable connection system is provided that includes, first normalizing the measurement parameters, then grouping the data, calculating compensation correction, finding the maximum value of the data, and comparing whether the cable has faults or not. By means of a blended data automatic analysis algorithm of the method, in the presence of multiple cables, data obtained through one-time measurement can be accurately identified to determine specific data of each scanning point that belongs to each cable, and after data allocation is completed, each group of data is separately corrected by using cable parameters corresponding to the group of data, thereby obtaining an accurate fault position and a DTF return loss result.

Abstract: The present invention relates to a circuit structure for realizing real-time pre-distortion calibration of broadband IQ modulation, comprises a baseband generation module, for the calibration signal generator to generate two orthogonal sine cosine calibration signals respectively according to the calibration bandwidth and the order of the pre-distortion filter, and the data switch is switched to the relevant data channel; a digital-to-analog conversion module, for converting the signals into analog I and Q baseband signals; a frequency synthesis module, for generating signals in a certain frequency range; a IQ modulation module, for mixing the analog baseband signal with the local oscillator signal; an amplitude control module, for continuous adjustment of the RF signal power. The present invention also relates to a method for realizing real-time pre-distortion calibration processing of broadband IQ modulation.

Abstract: A method for realizing predistortion compensation processing for 5G NR in-band modulated signals includes configuring the modulator to output a continuous wave signal, switch the output frequency interval of the signal to be consistent with the 5G NR subcarrier bandwidth, and record the power value P0 corresponding to the current frequency through the power meter. The power measurement difference between all points and P0 is calculated and performs normalization, and generates a compensated channel impulse response after shaping filtering; converts it into a power compensation factor in the time domain; performs inverse Fourier transform to generate I and Q baseband signals; generates compensated baseband data; the generated baseband data is filtered, and an analog zero intermediate frequency signal is generated, which is input to the broadband demodulator for frequency conversion modulation of the 5G NR broadband signal. The method operates without the need to modify the device circuit in the channel.

Abstract: A unitary sleeve lip seal can be used to provide permanently lubricated sealed bearings in severe service conditions such as the track pins of track-driven vehicles and agricultural equipment. The seal has a labyrinthine exclusion path and multiple dust lips contacting the sleeve in addition to the main sealing lip. A garter spring encircling the main sealing lip may enable the seal to operate at moderately elevated pressures. The sleeve has a radial flange at the outermost end. Elastomeric lips extend between the sleeve flange and a faceplate that terminates the outside end of the seal housing. The seal is packed with water-resistant grease and can, when installed in association with grease-packed bearings can create a permanently lubricated bearing/shaft assembly that requires no re-greasing. Resilient coatings both protect the sleeve and case and also improve leak resistance, especially when the seal is retrofitted onto shafts that have been damaged.

Abstract: Unitary radial lip seals are useful to provide permanent lubrication to rotary shaft and bearing assemblies. In addition, these seals also function as excluder seals to keep dirt, chemicals, and other contaminants from contacting the lubricated surfaces. However, previous radial lip seals have a tendency to wear or cut a groove into the associated rotary shaft, as the shaft is rotated during normal operation of the machine. The present disclosure describes a radial lip seal having a sleeve, a seal case, a faceplate and flexible member. This improved seal also has a second sleeve operably positioned between the shaft and the faceplate wiper ring that alleviates the tendency of the wiper ring to cut a groove into the shaft during normal operation of the machine.

Abstract: The present invention provides a system for managing information on a computer network having a server by gathering summary data from the information provider node indicative of event changes at the information provider node by information collection agents extracting information from the information provider node based on the summary data; transmitting the extracted information to the server; storing the transmitted information in an event database; cataloging the stored information into hierarchical categories; retrieving with a delivery agent based upon the hierarchical categories selected information from the stored information; and transmitting the selected information to the client node.

Abstract: The present invention provides a system for managing information on a computer network having a server by gathering summary data from the information provider node indicative of event changes at the information provider node by information collection agents extracting information from the information provider node based on the summary data; transmitting the extracted information to the server; storing the transmitted information in an event database; cataloging the stored information into hierarchical categories; retrieving with a delivery agent based upon the hierarchical categories selected information from the stored information; and transmitting the selected information to the client node.

Abstract: The present invention discloses a method of sealing dynamic shaft applications. The method comprises providing a dynamic shaft assembly containing a bore for receiving a seal, providing a unitized seal, and placing the unitized seal on the shaft, thus sealing the assembly so that lubricants may not escape, and foreign material may not enter. The unitized seal can provide permanently lubricated sealed bearings in severe service conditions such as rollers and idlers of track-driven vehicles and agricultural equipment.

Abstract: A unitary sleeve lip seal can be used to provide permanently lubricated sealed bearings in severe service conditions such as the track pins of track-driven vehicles and agricultural equipment. The seal has a labyrinthine exclusion path and multiple dust lips contacting the sleeve in addition to the main sealing lip. A garter spring encircling the main sealing lip may enable the seal to operate at moderately elevated pressures. The sleeve has a radial flange at the outermost end. Elastomeric lips extend between the sleeve flange and a faceplate that terminates the outside end of the seal housing. The seal is packed with water-resistant grease and can, when installed in association with grease-packed bearings can create a permanently lubricated bearing/shaft assembly that requires no re-greasing. Resilient coatings both protect the sleeve and case and also improve leak resistance, especially when the seal is retrofitted onto shafts that have been damaged.

Abstract: A method of commissioning an internal combustion engine controlled by an electronic engine control unit (ECU) is described. The method of commissioning includes an engine mapping function in which the engine is mapped at a combination of speeds and loads to build up a full set of engine operating parameters which are known collectively as the engine control set (ECS). The method includes defining a speed/load mapping table and generating a graphical display of a corresponding speed/load grid (20) having a plurality of cells arranged in a grid, each cell corresponding to a particular speed/load combination in the speed/load mapping table. The engine is driven as close as possible to a selected speed/load combination (24) and the value of a selected engine operating parameter is adjusted to obtain an optimum value at the selected speed/load combination. Each unmapped cell in the grid is displayed in a first visually distinct manner and each mapped cell is displayed in a second visually distinct manner.

Abstract: A unitary sleeve lip seal can be used to provide permanently lubricated sealed bearings in severe service conditions such as the track pins of track-driven vehicles and agricultural equipment. The seal has a labyrinthine exclusion path and multiple dust lips contacting the sleeve in addition to the main sealing lip. A garter spring encircling the main sealing lip may enable the seal to operate at moderately elevated pressures. The sleeve has a radial flange at the outermost end. Elastomeric lips extend between the sleeve flange and a faceplate that terminates the outside end of the seal housing. The seal is packed with water-resistant grease and can, when installed in association with grease-packed bearings can create a permanently lubricated bearing/shaft assembly that requires no re-greasing. Resilient coatings both protect the sleeve and case and also improve leak resistance, especially when the seal is retrofitted onto shafts that have been damaged.

Abstract: An engine control unit and method of controlling the operation of a gas fuelled internal combustion engine of the kind having a gas injector for injecting gaseous fuel into each cylinder and an inlet manifold through which air flows into each cylinder of the engine, the inlet manifold having a manifold valve to control the flow of air into the inlet manifold. An improved control strategy employed by the engine control unit involves closed loop control of airflow through the inlet manifold of the engine. Manifold absolute pressure (MAP) (70) and manifold air temperature (MAT) (72) are employed to calculate air density (84) which is representative of the mass of air flowing through the inlet manifold (28). The detected air density (84) is compared to a desired air density (DAD) (86) and an air density correction (88) is calculated to adjust the manifold valve position (MVP) (90).

Abstract: An in-flight entertainment system includes several liquid crystal display (LCD) retract units mountable in a passenger service unit of aircraft. Each of the LCD retract units includes an input connector and an output connector arranged such that signals provided to the input connector appear at the output connector. A system control unit (SCU) is also provided. The SCU is configurable to provide video, power and control signals independently to the input connector of each of the LCD retract units and is also configurable to provide video, power and control signals to the input connector of only a first of the LCD retract units. In the second configuration, the input and output connectors of successive LCD retract units are connected in a daisy chain fashion such that the same signals are provided to each of the LCD retract units. In another aspect of the present invention, each of the plurality of LCD retract units includes status communications bus electronics such as RS-485.

Abstract: A technique and system for isolating segments of a serial data bus for remote configuration of equipment in in-flight entertainment systems. The system allows the automatic initialization, or configuration, of multiple terminal units, attached to a serial data bus, without requiring physical access to the multiple units.

Abstract: An electronic timing system for producing precise timing control signals to the fuel injectors and ignition coils of an internal combustion engine. The system includes a cylinder cycle marker circuit (16) for generating an engine cycle reference signal based on the detected operational position of the engine as indicated by a TDC signal and a fly wheel teeth (FWT) signal. The system also includes a cylinder sequencer (22) for controlling the sequence of combustion in respective cylinders of the engine responsive to the engine cycle reference signal. A multiplying circuit (14) is provided for multiplying the incoming FWT signal to produce a high resolution engine rotation signal which is a programmable integer multiple of the FWT signal. Injector and ignition timing control signals can be delayed by timers (24, 26) with a programmable delay specified in terms of an integer multiple of the multiplied FWT signal, and can therefore be precisely set in terms of .degree.

Abstract: A gas injector for a gas fueled internal combustion engine having a valve member that is movable between a first or closed position, in which a flow of gas through the injector is prevented, and a second or open position in which a flow of gas is permitted through the injector. A solenoid actuator moves the valve member from the first to the second position responsive to an electrical control signal which is modulated to precisely control the quantity of gas to be delivered by the gas injector to the internal combustion engine. The valve member includes a hollow valve stem having a first opening at one end and a second opening in the form of three radial apertures at the other end to allow a flow of gas through the valve member in use. The valve stem is provided with an annular flange of magnetic material at one end, which faces the end face of the solenoid actuator and forms the armature of the magnetic circuit formed by the solenoid actuator.

Abstract: A backlight control method and apparatus adapted for use in, for example, aircraft passenger entertainment systems are described. The apparatus includes a present brightness/pre-determined brightness and comparator, and a brightness controller which limits present brightness to a selected level in a system deployed in a discrete space (such as a passenger cabin) having a plurality of displays. The method includes steps of comparing present brightness and predetermined brightness and generating one or more control signals to control backlight brightness based on the comparison to provide more uniform brightness in a display system including many displays co-located in a common space.

Abstract: A latch is disclosed for securing a television monitor for an aircraft video system in a horizontal position, wherein the monitor is rotatable between the horizontal position and a downward position suitable for passenger viewing. The latch includes a solenoid having a hinged element. The hinged element may be rotated to a closed position wherein the hinged element is in a vertical orientation. The hinged element may also be rotated to an open position wherein the hinged element is rotated away from the vertical orientation. Further, the hinged element includes a cutout having a reverse L-shaped configuration and a first mating surface. In addition, a notch is formed in a bezel for the monitor. The notch includes a second mating surface wherein when the hinged element is in the open position and the monitor is in the horizontal position, the second mating surface rests upon the first mating surface thereby securing the monitor in the horizontal position.