71results about How to "Improve Phase Accuracy" patented technology

A quadrature signal generator receives a differential input signal and generates quadrature output signals that are 90 degrees out-of-phase with each other. The quadrature generator includes a coarse stage and a plurality of refinement stages. The coarse stage generates quadrature signals that may have some phase error, and the refinement stages process the quadrature signals to reduce any phase error. The refinement stages receive quadrature signals from the output of the coarse stage, and processes the quadrature signals to reduce the phase errors. The coarse stage and the refinement stages are configured using delay circuits that can be implemented with inverter circuits, such as, for example, CMOS inverter circuits. In the refinement stages, corresponding outputs of the delay stages are averaged together to reduce the quadrature phase error.

The invention discloses a structured light illuminating microscopic imaging system based on an integrated photonic chip. The structured light illuminating microscopic imaging system comprises a light source, the integrated photonic chip, a sample containing table, a microobjective, a filter part, a photoelectric detector, a computer processing system and a control system. The light source is connected with the integrated photonic chip, the integrated photonic chip is arranged below the sample containing table, the microobjective is arranged above the sample containing table, the filter part is arranged above the microobjective, and the photoelectric detector is arranged above the filter part. A sample to be detected is fixed to the sample containing table, and light emitted by the light source irradiates the sample to be detected on the sample containing table after being processed by the integrated photonic chip. The computer processing system is connected with the sample containing table, the photoelectric detector and the control system. The integrated photonic chip is connected with the control system. According to the technical scheme, the system has the advantages of being small in size, compact in structure, high in system stability, high in solar energy utilization rate, high in imaging resolution ratio and the like, and is suitable for the real-time three-dimensional imaging study of living cells.

A circulation pump for circulating downhole fluids is provided. The circulation pump includes a cylindrical pump housing, a shaft secured in the pump housing extending in a longitudinal direction thereof, an impeller rotating around the shaft in the pump housing, a cylindrical magnetic coupler rotating around the pump housing, the cylindrical magnetic coupler including a magnet, and a motor positioned outside of the pump housing and connected to the magnetic coupler to rotate the magnetic coupler around the pump housing. The impeller is provided with a magnetic piece, which is capable of being magnetically connected with the magnet of the cylindrical magnetic coupler to cause the impeller to rotate around the shaft by rotating the cylindrical magnetic coupler around the pump housing.

The invention relates to a dual wavelength regression analysis-based optical fiber vibration sensor phase demodulation device, which is characterized by comprising a first narrowband laser, a second narrowband laser, a taper wavelength division multiplexer, a coupler, a digitally-controlled dimming delay line, an annular piezoelectric ceramic tube, a three-third coupler, a first taper wavelength division demultiplexer, a second taper wavelength division demultiplexer, a third taper wavelength division demultiplexer and a multi-channel data acquisition card, wherein the outer circle of the annular piezoelectric ceramic tube is uniformly wound with the vibration sensing optical fiber; and the annular piezoelectric ceramic tube can be telescopic periodically under driving of control signals.A dual-wavelength Mach-Zehnder interferometer and a three-third coupler digital phase demodulation technique are used, a dual wavelength regression analysis phase unwrapping principle is adopted, thepi phase limitation principle in the traditional phase unwrapping can be overcome in principle, instantaneous large-scale phase changes caused by actual strong vibration signals are tracked precisely,and a good and single-wavelength interferometry-consistent signal-to-noise ratio level is achieved.

The invention belongs to the technical field of intelligent detection for power systems and relates to an intelligent detection system for a transformer station computer monitoring system. The intelligent detection system comprises an upper computer, a measurement and control device and an intelligent detection device, wherein the intelligent detection device comprises a power module, a network interface, a singlechip, a digital signal processor (DSP), a field programmable gate array (FPGA), a digital / analog (D / A) converter, a synchronization module, a switching value input interface, a switching value output interface, a liquid crystal display (LCD) and input equipment; the intelligent detection device is connected with the upper computer through the network interface; the measurement and control device is connected with the intelligent detection device through the power module; the measurement and control device is connected with the upper computer, the switching value input interface and the switching value output interface respectively; and the network interface, the singlechip, the DSP, the FPGA, the D / A converter and the power module are connected with one another sequentially. The intelligent detection system has the characteristics of high phase precision, short response time and the like, and can meet a test requirement of the relevant national standard on the detection for the transformer station computer monitoring system.

The invention provides a double-frequency inusoidal grating absolute phase unwrapping method based on the integral linear programming search method. The method is characterized in that the integer linear programming method related to relative phase and fringe order is proposed according to the traditional double-frequency unwrapping principle, and the corresponding target functions and limiting conditions are created accordingly; a deformed inusoidal grating image is used as the calculating object to processing by ergodic searching by the method above, thus the integer pair of the fringe order can be quickly and accurately found out, and as a result, the purpose of unwrapping can be reached. According to the method, no requirement is proposed for the proportional relation between high frequency and low frequency, thus the applicable scope of the method is expanded; the order of priority is not proposed, so that the high-frequency and low-frequency unwrapping can be performed at the same time, and as a result, the operability of the method is improved; any intermediate over-capacity is not introduced and the sub-intervals are not divided, and therefore, the calculation process is simplified, the calculation amount is greatly decreased, and the operation efficiency is raised.

A method and device for generating a clock signal with predetermined clock signal properties firstly prepare a number of clock signals with an essentially identical frequency and with a respectively different phase relation with regard to a master clock signal in order to subsequently (on the basis of a control signal, which is prepared according to the clock signal to be generated), select predetermined clock signals from the number of prepared clock signals and to combine the selected clock signals in order to generate the desired clock signal.

The invention discloses a multi-phase delay phase-locked loop and a control method thereof. The multi-phase delay phase-locked loop comprises a delay part, a searching part and a control part, wherein the delay part is provided with a plurality of delay units used for outputting a multi-phase clock, the searching part is connected with the delay units and is used for searching for a target delay unit, and the control part is connected with the searching part and the delay units and is used for receiving the target delay unit sent by the searching part, prolonging delay time of the target delay unit, controlling the delay part to work in a second mode, obtaining the maximum delay time of the delay part, and controlling the delay part to work in a first mode if the maximum delay time does not reach a clock period of a system clock signal, and otherwise, controlling the delay part to output the multi-phase clock. By means of the multi-phase delay phase-locked loop and the control method, the problem that in the prior art, phase precision of a multi-phase delay phase-locked loop output clock is low, and therefore the effect of improving the phase precision of the multi-phase output clock is achieved.

The invention discloses a seven-bit high-precision broadband active phase shifter for a radio frequency / millimeter wave frequency band, which is characterized in that a single-ended signal output by apreceding-stage circuit is converted into a differential signal through a single-ended to differential passive balun, and four paths of I / Q orthogonal signals are generated through a second-order multiphase filter of an RC orthogonal network; providing gain for the generated four paths of I / Q orthogonal signals through the corresponding Gilbert units and realizing vector synthesis of the orthogonal signals; the synthesized signal is converted into a single-ended signal through the active balun, and the single-ended signal is amplified and output through the phase fine adjustment VGA; a vectorsynthesis quadrant is selected through a quadrant selection switch by adopting high two bits of a seven-bit digital control code, vector synthesis is realized by controlling the current magnitudes oftwo Gilbert units through a numerical control current array in the middle four bits, and phase fine adjustment is realized by controlling a switched capacitor in a VGA at the lowest bit. The invention has the advantages of simple circuit, low power consumption and small area, and can meet the beam scanning requirement of the phased array system.

There is provided a method of manufacturing a mask for exposure, which is capable of measuring the phase difference between a shifter portion and a non-shifter portion with good accuracy. A mask for exposure having: two first light-shielding device patterns, which are formed on a quartz substrate (transparent substrate) in a device region at a first gap and extend over a first concave portion; a second device light-shielding pattern at a second gap from the first device light-shielding pattern; two first light-shielding monitor patterns, which are formed on the quartz substrate in a monitor region at a third gap wider than the first gap and extend over a second concave portion; and second light-shielding monitor pattern, which has a fourth gap wider than the second gap from the first light-shielding monitor pattern, in which the size of the first light-shielding monitor pattern is equal to or less than the size of the first light-shielding device pattern.

A system clock recover device comprises a PCR value extracting module, a loading control module, a dichotomy frequency capturing module, a PID frequency tracing module, a local PCR generating module and a DA frequency control word outputting module, and detecting a reference PCR value of the system clock from a TS flow and sending to the dichotomy frequency capturing module, simultaneity loading the control module and ensconcing the PCR value which is extracted from the PCR value extracting module into the local generating module, wherein the dichotomy frequency capturing module rapidly captures frequency points of the system clock according to the PCR of the TS flow and the local PCR value, and the frequency points are traced by the PID frequency tracing module, wherein the PID frequency tracing module adopts a PID algorithm by using the PCR value of the TS flow and the local PCR, the DA frequency control word outputting module outputs a control voltage according to the obtained frequency control words, a voltage control crystal outputs local clock frequency according to the outputting voltage of the DA frequency control word outputting module and sends to the local PCR generating module. The invention has the advantages of rapid frequency capturing and high phase accuracy.

The invention provides a double beam integrated feed network, wherein amplitude phase error of the feed network is easy to control and the feed network is small in debugging workload, high in reliability and low in cost. The technical scheme includes that 12 routes of input signals of E1, E2...E12 are equally divided into two routes of signals through 12 2-equal power dividers. One route composes E gamma 1 through a 12-unequal power divider circuit board (1), and after phase delay is carried out, composition is carried out on the other route of the signals through a 12-unequal power divider circuit board (2), and each delay phase is composed to E gamma 2 in sequence. Physical vertical connection structures among the 12-unequal power divider circuit board (1), the 12-unequal power divider circuit board (2), the twelve 2-equal power dividers (3) and two output adaptors (4) is achieved by adopting a coaxial cable and micro-strip translation method, the 12-unequal power divider circuit board (1), the 12-unequal power divider circuit board (2), the twelve 2-equal power dividers (3) and the two output adaptors (4) are all integrated inside a feed network case seat (6).

A method and device for determining the intensity and phase distribution of a coherent light beam, in a plane, including measuring the intensity Ii, i=1 . . . N, of the beam, in N planes, N>=3, having the plane wherein intensity and phase distribution is to be determined, choosing, for plane i=1, an initial phase matrix phi1 and calculating a complex amplitude matrix, by term-wise multiplying the phase matrix eiphi1 by the corresponding amplitude matrix A1, for each plane j>1: determining a propagated complex matrix B'j from the measured amplitude matrix Aj-1 of plane j-1 and the phase matrix phi of plane j-1, extracting, from B'j, a phase matrix of plane j, and iterating the method up to convergence, with j=1 when j-1=N.

The invention belongs to the field of artificial intelligence of optical measurement, and particularly relates to a real-time single-frame phase extraction method. The method specifically comprises the steps of: 1) establishing a deep convolutional generative adversarial network, and determining a trained loss function; 2) establishing a fringe projection measurement system; 3) collecting a training data set; 4) calculating a phase truth value of a collected deformation fringe pattern; 5) training the network with the loss function and data set in the above-mentioned steps; and 6) conducting real-time single-frame phase extraction. The method provided by the invention mainly utilizes the generative adversarial network, adopts the deformation fringe pattern as the input, generates a corresponding phase diagram, and solves the problem that the existing single-frame phase extraction method is poor in phase extraction precision for low-frequency fringes and abrupt-change curved surfaces.

The invention discloses a single-frame stripe analysis method based on a multi-scale generative adversarial neural network. The method comprises the following steps: constructing a multi-scale generative adversarial neural network model; constructing a comprehensive loss function L of the multi-scale generative adversarial neural network model; collecting training data of the multi-scale generative adversarial neural network, and training the multi-scale generative adversarial neural network by using the training data; and inputting a to-be-measured stripe image into the trained multi-scale image generator to obtain a corresponding sine term, cosine term and modulation degree graph, and calculating a phase by using an arc tangent function. After the neural network is trained, complex calculation parameters do not need to be manually set in the calculation process, and operation is easier and more convenient. Due to the fact that the input of the neural network is a single stripe image,an efficient and high-precision phase calculation method is provided for stripe analysis of a moving object.

The present invention relates to communication technologies and provides a method and a device for FSK / GFSK demodulation, the method comprises: determining a digital information vector group {Vl(i)} of a codeword a[k] to be demodulated and a corresponding phase matching vector group {θi(i)] within the duration of (2M+1)T; determining a received phase vector {tilde over (φ)}(i) of a received FSK / GFSK baseband signal φ(t, a); determining an average phase difference βl between {tilde over (φ)}(i) and θl(i); calculating the phase matching degree Ql between {tilde over (φ)}(i) and θl(i) after removing the impact of the average phase difference βl, and determining an l value corresponding to the phase matching degree Ql being the maximum; and determining the a[k], corresponding to the l value, in the digital information vector Vi(i) as a demodulation result. Because the impact of the average phase difference is removed during phase matching, the accuracy of phase matching is increased, and the performance of the phase domain demodulation technology is improved.

A high-precision digital MEMS gyroscope control system comprises a driving mode closed-loop control loop, a detection mode closed-loop control loop and a modulation-demodulation signal phase closed-loop control loop, so that the system can always change along with the resonant frequency of a gyroscope. Herein, the phases of the two-mode modulation-demodulation signals are respectively adjusted through a driving mode demodulation signal phase adjustment value phi 1, a driving mode modulation signal phase adjustment value phi 2, a detection mode demodulation signal phase adjustment value phi 3 and a detection mode modulation signal phase adjustment value phi 4 which are subjected to temperature compensation. Through the system, the influence of modulation and demodulation signal phase errors on the gyroscope detection precision in the current gyroscope control system is solved, and the performance index of the MEMS gyroscope is greatly improved.

According to one embodiment of the invention, a method of increasing a phase resolution of an array antenna, comprises providing an array antenna having a plurality of rows of antenna elements, each antenna element having a first phase resolution; for at least one row of the array antenna, positioning each of the antenna elements to one of first and second phases, the first and second phases separated by at least the first phase resolution; for the at least one row of the array antenna, a number of antenna elements positioned to the first phase is the product of a number of antenna elements in the at least one row of the array antenna and a desired row phase angle divided by the first phase resolution; and for the at least one row of the array antenna, a number of antenna elements positioned to the second phase is the number of elements in the at least one row of the array antenna minus the number of antenna elements in the at least one row positioned to the first phase.

A synthesizer comprises a two-point modulation phase locked tow, TPM PLL, circuit configured to receive a frequency tuning signal and to generate a stepped chirp signal in an intermediate frequency range by applying a two-point modulation PLL on the frequency tuning signal, and a subsampling PLL circuit configured to receive the stepped chirp signal in a mm-wave frequency range and to generate a smoothened chirp signal in a mm-wave frequency range by applying a subsampling PLL on the stepped chirp signal.

An ECU executes a program including the steps of: detecting engine speed NE (S100); and stopping power supply to an electric motor of an intake VVT mechanism (S104), if engine speed NE is equal to or lower than a threshold value NE (0) (YES at S102).

A phase difference AF processing unit (19) connects detection signals of phase difference detection pixels (52A) in an AF area (53), connects detection signals of phase difference detection pixels (52B) in the AF area (53), and performs a correlation operation with respect to detection signal groups after connection to generate a defocus amount when it is determined that a subject image formed in the AF area (53) includes a high frequency component. The phase difference AF processing unit (19) performs a correlation operation with respect to detection signal groups of phase difference detection pixels (52A, 52B) in each pair line in the AF area (53) to generate the defocus amount when it is determined that the subject image formed in the AF area (53) does not include a high frequency component.

The invention discloses a compact waveguide power divider which comprises an input end 1, a transitional section 2, and at least two input ends 3. By controlling the width of the output end 3 and the thickness of a wall between each two adjacent output ends 3, and enabling the width and the thickness to be satisfied with a certain proportional relation, the input power can be well distributed into two ways to ten ways according to arbitrary power distribution ratio in waveguide full bandwidth. The compact waveguide power divider can be widely applied to military and civil fields of antenna array, phased array radar and power synthesis, missile guidance, communication and the like.

The invention discloses a multi-channel sampling-tracking-holding equipment, comprising a power division circuit, a multi-channel sampling-tracking-holding circuit and a multi-phase clock generation circuit, wherein the power division circuit is provided with one input end and multiple output ends; the multi-channel sampling-tracking-holding circuit is provided with multiple channels, each channelis provided with a sub-sampling-tracking-holding circuit, and each output end of the power division circuit is separately connected with one sub-sampling-tracking-holding circuit; and the multi-phaseclock generation circuit is simultaneously connected with each sub-sampling-tracking-holding circuit, and clock signals transmitted to the adjacent two sub-sampling-tracking-holding circuits have equal intervals. According to the scheme of the invention, the high-frequency sampling of an original high-speed signal can be realized without increasing the external sampling clock frequency of a chipor without using an external sampling clock of the chip, and high requirements for a subsequently-connected analog-to-digital converter cannot be generated.

The invention discloses a high-precision frequency domain stability measuring device and method. The high-precision frequency domain stability measuring device comprises a frequency switching module, a reference source module, a phase comparing module, a high-resolution counting module, a central processing unit and a frequency dividing module, wherein the frequency switching module comprises a secondary processing module and is used for converting measured time domain signals into standard 1 KHz first frequency signals and transmitting the standard 1 KHz first frequency signals to the secondary processing module and the high-resolution counting module when the reference source module serves as a time base; the secondary processing module is used for processing the first frequency signals and outputting 100 Hz second frequency signals to the phase comparing module; the frequency dividing module is used for performing frequency division on the signal frequency of the reference source module and outputting sampling time signals to the phase comparing module.

The invention relates to the field of semiconductors, and more particularly to a zero-crossing detection circuit. The zero-crossing detection circuit has a coupling unit having a first input terminal and a second input terminal and used for coupling and outputting an input signal between the first input terminal and the second input terminal; a filter unit connected to the coupling unit and used for receiving the input signal outputted from the coupling unit and filtering the input signal to form a filter signal output; a detection unit connected with the filter unit and used for receiving the filter signal and computing the filter signal according to a predetermined computing method to form detection phase information. The detection phase information V3 acquires the phase information V2 of the signal of the input terminal of the filter unit, and the phase information of the input signal V1 of the first and second input terminals is calculated by the phase information V2 of the signal of the input terminal of the filter unit, and whether zero crossing occurs is determined by determining the phase information of the input signal V1 at the first and second input terminals. The zero-crossing detection circuit makes a zero crossing signal have high precision, and is low in power consumption and fast in convergence speed.