230 results about "Pulse synchronization" patented technology

A system for transmitting information in a well comprises a tubular string disposed in the well and having a drilling fluid flowing therethrough. A pulser is disposed in the tubular string and transmits a pulse synchronization marker comprising a chirp signal. A surface controller, acting under programmed instructions, detects the chirp signal adjusts a signal decoding technique based on the detected chirp signal.

A system for determining the level of shielding in a magnetic resonance imaging (MRI) apparatus and for real-time reduction of noise produced during MRI data acquisition. The system includes: at least one antenna; data acquirer in communication with the at least one antenna and in communication with the RF pulse generator; and a synchronizer for synchronizing the acquisition of data by the data acquirer with MRI pulses being produced by the MRI apparatus.

A radio frequency (RF) power delivery system includes a first RF generator and a second RF generator. The first RF generator operates as a master RF generator, and the second RF generator operates as a slave RF generator. The slave RF generator includes a detector for sensing an electrical characteristic of the RF signal of the slave RF generator. The slave RF generator also includes a detector for sensing an electrical characteristic of the RF signal from the master RF generator. Operation of the slave RF generator is controlled by a host or controller. The host or controller operates the slave RF generator in accordance with electrical properties determined by the second detector.

A synchronous memory device, receiving a number of data in synchronization with a rising edge and a falling edge of a clock, includes a data strobe buffering unit, a data align latching unit and a DQS signal controlling unit. The data strobe buffering unit outputs a rising pulse and a falling pulse for detecting a rising edge and a falling edge of a DQS signal that sustains a high impedance state when there is no operation and is clocked while the data is inputted. The data align latching unit latches and aligns the data in synchronization with the rising pulse and the falling pulse. The DQS signal controlling unit controls the data strobe buffering unit to output the rising pulse and the falling pulse to the data align latching unit only when the DQS signal is clocked.

The invention discloses a novel method for realizing spectral combination amplification based on the frequency division multiplexing technology, which comprises the following steps of: (a), pre-amplifying and broadening laser pulse generated by an ultra-short pulse oscillator; (b), segmenting the frequency spectrum of a super-continuous broad-band spectrum into multiplex optical pulses with different central wavelengths; (c), amplifying each optical pulse, outputting a part of amplified seed light to a self-reference zero-frequency detection device by using a splitting slice, and taking a beat frequency signal output by the self-reference zero-frequency detection device as the driving frequency of an acousto-optic frequency shifter after filtering and amplifying; (d), coherently synthesizing amplification pulses output by various multi-stage optical fibre amplifiers through a wavelength division multiplexing beam combiner; and (e), carrying out dispersion compensation and pulse width compression of coherently synthesized pulses by using a compressor so as to obtain ultra-short pulse output with high peak power. According to the invention, the frequency division multiplexing technology and the coherent synthesizing technology are organically combined; therefore, the pulse synchronization problem and the spectrum coherent problem in the ultra-short pulse optical fibre laser coherent synthesizing process are solved.

The invention relates to a new method for measuring an ultrashort light pulse spectral phase in the field of information optoelectronics and a device thereof. According to the method, a time delay minus T with polarity is introduced between two quasi-monochromatic light components with frequency Omega generated by the chirped stretching of a pulse to be detected; an additional time delay plus T, which is introduced between two quasi-monochromatic light components due to a pulse stretcher, is compensated to be in synchronization with the pulse to be measured and generate two sum frequency lights together with the pulse through a sum frequency crystal; respective power spectra and coherent spectra without interference fringe are acquired through a spectrometer. The phase difference between the two sum frequency lights is calculated by the three spectra through formulae. A spectrum phase curve of the pulse to be measured is calculated by adopting a concatenated method. The method can accurately determine the phase difference polarity of the pulse spectrum, and provide the simple, real-time, rapid and accurate measurement method and the device thereof for measuring the ultrashort optical pulse spectral phase.

The invention provides a synchronous pulse exposure method for maskless lithography equipment. The maskless lithography equipment adopts an exposure imaging system consisting of a UV (ultraviolet) laser or UV LED light source, a DMD (digital micro-mirror device) and an optical lens; the synchronous pulse exposure method is characterized in that a series of pulse synchronization signals are generated, the DMD and the UV laser or UV LED light source are triggered to synchronously work, and the pulse interval of the pulse synchronization signals depends on the replacement or refreshing cycle of the DMD to graphs; a digital laser direct-writing system comprises an upper computer in charge of outputting digital lattice patterns and the series of pulse synchronization signals to the exposure imaging systems, and one or more exposure imaging systems arranged side by side. According to the method, a synchronous control problem of parts of the lithography equipment is solved, more effective and reasonable exposure and refreshing time is convenient to design, and the shortcomings of low production capacity and poor system adaptability of a conventional exposure machine are overcome.

A method and apparatus for driving a liquid crystal display enhances display quality and reduces power consumption. A portion of inputted data may be reproduced and used in the generation of dummy data. A scanning pulse is applied to gate lines of a liquid crystal display panel supporting lines crossing the gate lines. Consecutive ones of thin film transistors within columns of liquid crystal calls may be alternately coupled to adjacent ones of data lines. The inputted data and the dummy data are applied to the data lines in synchrony with the scanning pulse.

The invention discloses a method for demodulating and decoding an IRIG-B code, comprising the steps as follows: 1. the amplitude of an IRIG-B alternating current analog signal is measured and compared with a reference level so as to generate a square wave signal, thus determining the positive over-zero point of the analog signal; 2. according to the positive over-zero point of the analog signal, the IRIG-B alternating current analog signal is sampled and compared for judgment with the pre-arranged reference amplitude, thus generating an IRIG-B direct current signal; and 3. the high level width of the IRIG-B direct current signal is counted, the rising edge position of the reference code is judged and determined, the data information '1' and '0' is determined, the time slot information is inserted and second pulse and time information are output. The invention which adopts the technical proposal can realize demodulation of the analog signal and can obtain the benchmark second pulse signal, time information and the like; the second pulse obtained by demodulation has high synchronization precision, simple principle and easy execution.

The invention provides a method for measuring parameters of secondary radar echo pulses, which is simple, convenient and reliable in operation and accurate in measurement, is independent of universal instruments, and can be used for accurately measuring the secondary radar echo pulses. According to the technical scheme, the method provided by the invention comprises the following steps of: firstly, detecting the secondary radar echo pulses by a log amplifier to obtain video pulse signals; converting the video pulse signals into differential signals, and then carrying out A/D (Analog/Digital) sampling after the differential signals enter an A/D converter; detecting trigger pulse synchronization signals after putting A/D sampling data into an FPGA (Field Programmable Gate Array); computing the number of clocks by a counter in the FPGA to obtain aircraft distance parameters; submitting the sampling data to computer analysis processing software after being subjected to coding and framing; resolving pulse power and the aircraft distance parameters to obtain the various parameters of the secondary radar echo pulses; and reconstructing measured time domain waveform to a human-computer interface and displaying parameter output. According to the invention, the universal instruments such as an oscilloscope, a power meter and the like are reduced and the complicated test process is simplified.

The objective of the invention is to provide a method of chaotic hybrid self-synchronization. Both communication sides get digital signal after sampling and analog-digital conversion of local continuous chaotic signal respectively at regular intervals. Sender executes pulse synchronization to continuous chaotic system with received digital signal and then transmits error correction signal including 1bit information to receiver. Receiver executes pulse synchronization to its continuous chaotic system with corrected digital signal. Continuous chaotic system at different location only need to transmit error correction information of 1bit to keep long period of steady synchronization through the synchronization method. Occupation rate to channel by redundant information fall to low and anti-attack ability of chaotic system is improved efficiently. The digital chaotic sequence output by chaotic system that synchronized through the invention can be used to encrypt data as pseudo-random sequence or key stream; the output continuous chaotic signal can be used to design encryption communication system that based on chaotic synchronization.

The invention provides a telemetry remote control system for an underwater vehicle. The real-time positioning of the underwater vehicle can be achieved. The system comprises a communication buoy groupnetwork, the underwater vehicle and an integrated processing display control system. The communication buoy group network includes at least three communication buoys for communicating with the underwater vehicle. The underwater vehicle includes a telemetry remote control section for transmitting distance information and telemetry information of the underwater vehicle to the communication buoys and receiving remote control information sent by the communication buoys. The telemetry remote control sections and the communication buoys are respectively equipped with high-precision synchronous clocks for pulse synchronization. The integrated processing display control system is used for receiving buoy positioning information sent by the multiple communication buoys and the distance informationand telemetry information of the underwater vehicle, thus the positioning of the underwater vehicle is achieved, and the integrated processing display control system is also used for sending control commands to the underwater vehicle through the communication buoys. According to the telemetry remote control system of the invention, the accurate measurement of an entire track of an underwater vehicle cruise process can be achieved.

A global and local read control synchronization method and system are provided for a memory array configured with multiple memory subarrays. Address signals are decoded to activate based thereon subarray select signals and a cumulative subarray select signal. The cumulative subarray select signal goes active whenever a subarray select signal goes active, and therefore, each pulse of the cumulative subarray select signal is synchronous with one pulse of the subarray select signals. Local read control signals for the multiple memory subarrays are obtained employing the subarray select signals, and at least one global read control signal for the memory array is obtained employing the cumulative subarray select signal. In one example, the memory array has a hierarchical bitline architecture.

The embodiment of the invention provides a frame synchronization signal generation method and projection equipment. The method comprises the steps that a first operation signal generated when a scanning galvanometer of an MEMS operates on the basis of a vertical driving signal and a second operation signal generated when the scanning galvanometer operates on the basis of a horizontal driving signal are acquired; And acquiring a pulse synchronization signal which is generated based on the vertical driving signal, has the same frequency and the same phase as the vertical driving signal, and hasa pulse rising edge within an image scanning time range of the vertical driving signal. And performing waveform shaping on the second operation signal to obtain a reference clock signal with the samefrequency and phase as the second operation signal. And based on the image resolution of the to-be-scanned image, the first operation signal, the pulse synchronization signal and the reference clock signal, generating a frame synchronization signal with the same frequency and the same phase as the first operation signal, so that the laser lights the to-be-scanned image by taking the frame synchronization signal as a frame start time sequence. The stability of the projection picture can be greatly improved.

The invention belongs to the radar signal simulation processing field and discloses a missile-borne radar signal processing semi-physical simulation test system. The system comprises a radar seeker comprehensive test device, an analog-to-digital conversion module, an FPGA pre-processing module, a DSP imaging processing module, and an upper computer display terminal; a signal source outputs two paths of reference clocks, wherein one path of reference clock is adopted as a reference clock for the radar seeker comprehensive test device, and the other path of reference clock is used as a samplingclock for a signal processor; the radar seeker comprehensive test device outputs analog radar echo signals and frame synchronization and pulse synchronization signals; the analog-to-digital conversionmodule completes A/D sampling of the analog radar echoes; an FPGA is adopted as the pre-processing module and completes data pre-processing and data ping-pong transmission; two DSP chips in the DSP imaging processing module complete imaging processing, and another DSP chip in the DSP imaging processing module completes the transmission of an imaging result to an upper computer; and the upper computer display terminal displays an imaging processing result in real time.

A pulse generator generates a plurality of column pulses in response to a read command. An address counter outputs addresses subsequent to an external address supplied in association with the read command in succession as internal addresses. A column decoder successively selects column selecting lines in synchronization with the column pulses. A plurality of bits of data read from memory cells in response to a single read command RD is successively transmitted to a common data bus line through column switches. This can reduce the number of data bus lines to a minimum, preventing an increase in chip size. Since a single data bus line can transmit a plurality of bits of data, it is possible to minimize the size of the memory region to be activated in response to a read command. This consequently allows a reduction in power consumption.

The invention discloses a high time resolution low noise single photon detector based on optical pulse synchronization. The single photon detector comprises an optical pulse generator, an optical fiber coupler, an optical attenuator, an optical delayer, a photoelectric conversion module, a gate pulse amplifier module and a signal extraction module, wherein the optical pulse generator is connected with the optical fiber coupler and divided into two paths, one path is connected with the optical attenuator, the optical attenuator is connected with the optical signal input end of the gate pulse amplifier module, the other path is connected with the optical delayer, the optical delayer is connected with the optical signal input end of the photoelectric conversion module; the output end of the photoelectric conversion module is connected with the electric signal input end of the gate pulse amplifier module; and the electric signal output end of the gate pulse amplifier module is connected with the signal extraction module. The single photon detector uses the optical delayer and the photoelectric conversion module to convert the optical signals to Gaussian electric signals which are used as gate pulse signals, thus the noise of the avalanche photo diode (APD) caused by capacitance effect can be reduced and the signal-to-noise ratio can be increased.

The invention discloses a touch simulation device, which is arranged above a device to be touched. The touch simulation device comprises emitting electrodes, receiving electrodes and a signal processing circuit, wherein the emitting electrodes and the receiving electrodes are mutually crosswise arranged and are electrically insulated from each other; the signal processing circuit receives a touch control instruction; the receiving electrodes receive a pulse synchronization signal of a driving circuit in the device to be touched through electric field induction; the signal processing circuit processes the pulse synchronization signal into a synchronous electric field signal applied to the emitting electrodes according to the touch control instruction; and the synchronous electric field signal enables an induction circuit in the device to be touched to generate electric field change for determining that touch behaviors happen. The invention also discloses a touch simulation method. In the absence of physical motion, the touch simulation device and the touch simulation method realize the finger touch simulation of touch-sensitive devices including a touch screen, support the simulation of actions including multi-point touch, dragging, click, double click and the like, and realize the operation of the touch-sensitive devices including the touch screen and the like under the condition that a space above the touch screen is insufficient or a user can not conveniently operate with hands.

The invention provides a pulse synchronization method and module whose arithmetic is simple and easy to realize in mobile communication terminal receiving property test. The method is used to realize the synchronization between the radio frequency receiving window and burst pulse of test equipment, thereinto, Tb is the time interval of burst pulse, Tr is the time interval of opening the radio frequency receiving window, Delta T is difference between Tr and Tb, Toffset is original time warp between the radio frequency receiving window and burst pulse when the radio frequency receiving window is opened first time before synchronization, firstly, judging whether Toffset exceed the set range, if it exceeds the set range, then Tr=Tb+ Delta T is the time interval to open the radio frequency receiving window until the Toffset does not exceed the set range, secondly, correcting the time interval Tr of opening said radio frequency receiving window to fulfill Tr=Tb+Toffset.

The invention is applicable to the technical field of electronics, and provides a programmable delay trigger pulse synchronization device, which comprises a pulse input unit, a programmable logic array, a pulse output unit and a control unit, wherein the pulse input unit is used for inputting multiple paths of pulse signals to the programmable logic array; the programmable logic array is formed bymultiple paths of delay channels, and the multiple paths of delay channels are respectively used for carrying out delayed time processing on the multiple paths of pulse signals in order to output multiple paths of synchronous signals to the pulse output unit; the control unit is used for configuring the number of the delay channels in the programmable logic array and the delay time of each delaychannel; and the pulse output unit is used for outputting the multiple paths of synchronous signals to a lower-level circuit. According to the device, the number of the delay channels and the delay time of each delay channel can be conveniently and flexibly changed, a circuit hardware structure of a synchronous machine is simplified, and the hardware cost of synchronous machine products is reduced.

The invention discloses a multimode multi-machine X-channel programmable pulse synchronization control method and a multimode multi-machine X-channel programmable pulse synchronization control device. The method comprises the following steps of: taking certain fixed time as a reference, resolving reference time deviations, calculating a difference between the two reference time deviations, converting a unit to second, and calculating the state of a pulse cycle at the current time by utilizing the cycle length of a channel. By the method and the device, a plurality of machines which are asynchronously started can output synchronous programmable pulse waveforms, so that time and frequency synchronization accuracy is effectively improved when the plurality of machines are asynchronously started, and the time synchronization accuracy of dozens of nanoseconds can be achieved.

A semiconductor memory device includes a timing signal circuit to generate a refresh timing signal comprised of a series of pulses, a refresh address circuit to generate a refresh address in synchronization with each pulse of the refresh timing signal, a pulse selecting circuit to assert a refresh request signal in synchronization with pulses selected from the series of pulses, and a memory core to receive the refresh address and the refresh request signal and to perform a refresh operation with respect to the refresh address in response to assertion of the refresh request signal, wherein arrangement is made to switch between a first operation mode in which the selected pulses are obtained by selecting one pulse out of every predetermined number of pulses from the series of pulses and a second operation mode in which the selected pulses are obtained by selecting consecutive pulses from the series of pulses.

The invention discloses a fast calibration test system and method for a phased-array antenna, belongs to the technical field of antenna measurement, relates to a near-field test system, and particularly relates to fast calibration and directional diagram test of the phased-array antenna. The system comprises an upper computer module, a switch module, a synchronous control module, a signal source module, a power amplifier module, a low noise amplifier module, a to-be-tested phased array antenna, a power supply module, a calibration control module, a scanning module, a signal conditioning module and a vector network module. Bases on pulse synchronous control, the loading delay of wave control codes is shortened by using real-time calculation, the channel calibration of the phased-array antenna under various frequencies can be completed through two rounds of scanning, and a directional diagram test of the phased-array antenna under the combination of various frequencies and directional angles can be covered through one round of scanning.

The invention belongs to the navigation technology field, relating to an open and closed loop mixing correction method of an inertia/satellite combination navigation system. The invention employs the open and closed loop mixing correction method to correct a margin of error of the inertia satellite navigation system. In closed loop correction, a method of using an adaptive Kalman filter to measure a noise variance value is employed, the method is simple and easy, implement difficulty is small, jumping abnormity of satellite navigation data and large fluctuation of correction amount when entering into a combination state after long time of not combination can be effectively inhibited, and accuracy and stability of closed loop correction are raised. In open loop correction, real-time updating in each second is performed on collected measurement amount, correction frequency is same with inertial navigation system data bus frequency, in closed loop and opened loop correction of different frequency, a method of second pulse synchronization according to a satellite navigation receiver is employed, seamless connection is realized, error correction is rapid and smooth, and a problem that closed loop correction is easy to interfere open loop correction is solved.