179 results about "Phase shift module" patented technology

A back-end assembly for use with a front-end assembly in acquiring phase-shifted interferograms having a plurality of imaging modules (Ma, Mb, Mc). Each module (Ma, Mb, Mc) has a quarter wave plate (30a, 30b, 30c), a polarizer (32a, 32b, 32c), and an image sensor (34a, 34b, 34c) so that each polarizer has a different rotation orientation thus acquiring phase-shifted interferograms.

The invention relates to a generating set sub-synchronous oscillation suppression method adopting a full-controlled variable current device. The method uses the variable quantity of a rotating speed signal of a generating set as a control quantity, and performs filter, phase shift, proportional amplification and operation processing on the variable quantity of the rotating speed signal to acquire a control signal for controlling a variable current power unit by using a voltage synchronization signal as standard, then the full-controlled variable current device generates a sub-synchronous model modulation current, and the current affects the rotating speed of the generating set through a power transmission unit so as to achieve the aim of suppressing the sub-synchronous oscillation of the generating set. A controller comprises a plurality of signal processing subunits and a main control subunit, wherein each signal processing subunit comprises a filter module, a phase shift module, a proportional amplification module and an operation module; and the main control subunit accomplishes the control for the full-controlled device. The method can effectively suppress the sub-synchronous oscillation problem of a power grid system, has high response speed and high tracing precision, and can greatly improve the stability and reliability of a power grid.

The invention relates to a multi-channel high precision phase control signal generation device which utilizes a programmable read-only memory to generate a customized special circuit in an FPGA (Filed Programmable Gate Array) circuit through a VHDL (Very High Speed Integrated Circuit Hardware Description Language) language programming. The multi-channel high precision phase control signal generation device comprises a phase shift module, a phase coding module, an address coding module and a plurality of multi-channel gates. By taking a high precision active crystal oscillator as an information source, all multi-channel gates works in parallel to receive phase control signals of a host computer and output square wave signals of a multi-channel special phase. The output square wave signals access resonance of a power amplifier to generate sine wave signals with the same frequency and phase with the traditional output signals and the sine wave signals are used for excitation signals of an ultrasonic transducer array element in a phase control type high intensity focusing ultrasonic treatment system; and the frequency of the crystal oscillator is determined by the resonance frequency and the phase control precision requirements of the ultrasonic transducer array element. The invention dramatically increases the channel amount of the phase control signals and enhances the precision of the phase control signals, thereby satisfying the needs of the high intensity focusing ultrasonic treatment system.

The invention relates to the field of mobile communication base station antennae, in particular to a phase shifter applied to electric tilt base station antennae. The invention discloses a phase shifter module based on medium loading, comprising a transmission line structure which takes air as transmission medium and a basic transmission mode as a TEM model or a quasi-TEM model, such as strip lines or microstrip lines. The phase shifter module is characterized in that the phase shifter module also comprises at least one movable medium sheet arranged between transmission lines; according to the strip line structure, the medium sheet is also provided with a gap for arranging the strip line; along with the movement of the medium sheet, transmission lines and the medium sheet have relative displacement; and phase position delay is changed by changing the superposition area of the medium sheet and the transmission lines so as to realize signal phase shift. When the phase shifter works, the medium sheet moves vertically to energy transmission direction; by selecting medium material with low loss, the phase shift module has the advantages of low insertion loss, less spurious radiation, large phase shift amount, small volume, low cost and the like, and the phase shift amount and the medium sheet displacement are in linear relation; because of adopting modular design, the invention can be conveniently connected via the coaxial line, thus realizing flexible layout and diversified phase shift and feed network design.

The invention discloses a method and a device for suppressing subsynchronous resonance through a doubly-fed fan rotor side converter. The method comprises the steps as follows: a rotating speed signal and a subsynchronous resonance frequency of a wind generator rotor are obtained; an additional controller is determined according to the amplitude-frequency characteristics and the phase-frequency characteristics of the relationships of a rotating speed variation and an electromagnetic torque variation; the rotating speed signal is processed through the additional controller to obtain an additional controlled quantity; the additional controller comprises a band-stop filter module, a band-pass filter module and a phase-shift module; the additional controlled quantity is injected into the rotor side converter and is superposed to an original controlled quantity to generate an additional torque; and the phase difference between the additional torque and the rotating speed variation is within a range of 90-270 degrees, so that the target of suppressing the subsynchronous resonance in a doubly-fed fan series compensation transmission system is achieved.

The invention discloses a coarse granularity dynamic reconfigurable data integration and control unit structure. A data stream control module comprises a vector loading module, a vector phase shift module and an unpacking and distribution module. The three modules achieve multi-level composite two-stage flow lines through a double-buffering register, and achieve synchronization of the flow lines through hardware handshake. The vector loading module achieves access to different data address spaces through dynamic configuration allocation, and finishes data loading from a memory to a vector data register file. The vector phase shift module achieves shift, splicing and other operations of data stream in a dynamic reconfigurable allocation mode, and output data are written into a vector phase register file. The unpacking and distribution module achieves distribution of the register data through allocation, and meets the requirement of an array for concurrent input of calculation data. The coarse granularity dynamic reconfigurable data integration and control unit structure effectively solves the non-aligned access and data integration problems in the data loading process.

A simultaneous phase-shifting white light scanning interferometer comprises a white light scanning interferometer, a simultaneous phase-shifting module, and a scanner. Light from a short coherence length light source may be polarized and then split, by a polarization type beam-splitter, into orthogonally polarized reference and test beams. The simultaneous phase-shifting module comprises a plurality of detectors, allows for controlled phase shifts between the reference and test beams, and creates at least three independent interferograms, each with different phase shifts between the reference and test beams. The scanner translates the simultaneous phase-shifting module with respect to an object under measurement.

Disclosed is a central aortic pressure detection system and method based on oscillating sphygmomanometer signals. The system comprises a signal acquiring module, a pressure wave decomposition module, a phase shift module and a reconfigurable computing module. The method includes amplifying oscillating wave signals detected through a left upper arm blood pressure meter on the condition of high cuff operating pressure to acquire an approximation of brachial artery blood pressure waves, dividing the brachial artery blood pressure waves into two blood pressure wave components of front transfer and rear transfer, then performing phase shift on the blood pressure wave components of the front pass and the rear pass of the brachial artery to acquire blood pressure wave components of the front transfer and the rear transfer of the central artery of the subclavian artery, then reconstructing the central aortic pressure wave by combining the blood pressure wave components of the front transfer and the rear transfer of the central artery, performing wave analysis, and computing systolic pressure, diastolic pressure and pulse pressure of the central artery. The method and device has the advantages that the central artery pressure is estimate and detected rapidly and noninvasively, individual factors of a patient can be considered more completely in the signal processing process, and accordingly a more accurate detecting result can be acquired.

The present invention discloses a method and system for inhibiting double-feed wind turbine sub-synchronous oscillation. The system comprises a double-feed wind turbine, an active power damping controller and a reactive power damping controller. The active power damping controller and the reactive power damping controller are configured at the active and reactive power outer loop control modules of the rotor side inverter of the double-feed wind turbine. The active power damping controller is used for receiving an active power signal and outputting an active additional damping power signal to the active power outer loop control module after the active power signal is processed by a filtering module, a phase shift module, a gain module and an amplitude limiting module. The reactive power damping controller is used for receiving a reactive power signal and outputting a reactive additional damping power signal to the reactive power outer loop control module after the reactive power signal is processed by the filtering module, the phase shift module, the gain module and the amplitude limiting module. The double-feed wind turbine adjusts electrical damping according to the active additional damping power signal and the reactive additional damping power signal, and the sub-synchronous oscillation is inhibited.

The invention discloses a dual system independent downward inclination angle adjustment base station electrically-controlled antenna, and the antenna comprises a front radiating element and a back feed network. The feed network comprises a single combiner, a power dividing combiner and an independent phase shift part, the independent phase shift part comprises two layers, and the two layers can respectively and independently adjust an electrical downward inclination angle of one system, so that a dual system independent downward inclination angle adjustment function is realized. Each system adopts an independent feed cable network to form a vertical plane directional diagram, so that forming effect of each system can be effectively improved. Upper and lower phase shift modules comprised by the independent phase shift part and a middle power divider can commonly realize a six-way phase shift function, a good vertical plane forming effect can be acquired, feeder connection can be effectively dispersed, so that the assemblability and the index consistency can be greatly improved. The dual system sharing radiating element, independent forming and independent adjusting downward inclination angle base station electrically-controlled antenna scheme saves antenna resources and can effectively improve covering effect of each system.

A system and method are provided for estimating bearing of a target based on RF signals received by an array of antenna elements. The system comprises first and second input channels that are configured to receive analog signals that correspond to first and second antenna elements. The system also includes an analog to digital converter module for converting each of the analog signals to digital data samples and outputting separate streams of digital data samples corresponding to each of the first and second antenna elements as first and second data streams. An in-phase and quadrature detector module includes a phase shift module for shifting each of the first and second data streams by a predetermined amount of time to form first and second phase shifted data streams. A surveillance module determines a bearing of the target based on in-phase and quadrature data.

The invention belongs to the technical field of the detection of weak signals and particularly relates to a lock-in amplifier circuit for detecting terahertz pulse signals. The lock-in amplifier circuit comprises a photoelectric detector used for detecting the terahertz pulse signals, a pre-amplification module, a phase shift module and a phase-sensitive detection module. The lock-in amplifier circuit is characterized in that: signals to be detected which are acquired by the photoelectric detector are processed by the pre-amplification module and are connected to one input end of the phase-sensitive detection module; reference signals after the phase shifting operation by the phase shift module are connected to the other input end of the phase-sensitive detection module; the output end ofthe phase-sensitive detection module outputs signals; the pre-amplification module comprises a band-pass filter circuit and a second-order amplifying circuit which are sequentially connected; the phase shift module consists of a CD-951V4 chip and peripheral circuits of the CD-951V4 chip; and the phase-sensitive detection module consists of a CD552-R3 chip and periphery circuits of the CD552-R3 chip. The lock-in amplifier circuit can detect microvolt-level low-voltage signals with the noise of millivolt level, and is suitable for small-signal and intensive-background noise occasions such as signals acquiring of terahertz time-domain spectrometer, wherein the signal-to-noise ratio of output signals reaches over 50:1.

The invention provides a massive MIMO performance conduction test system, comprising a base station and an M*N radio frequency matrix, wherein the base station is used to send M paths of original signals; the M*N radio frequency matrix is used to receive the M paths of original signals sent by the base station, convert the received M paths of original signals into N paths of received signals, andsend the received signals to terminal equipment; and M*N paths of channels are formed between the M paths of original signals and the N paths of received signals, and each channel is provided with anattenuation module, a phase shifting module or an attenuation phase shifting module. According to the scheme of the invention, an external field channel environment that simulates a 5G massive antennaarray base station can be achieved by using the forms of the radio frequency matrix and a channel instrument, and the massive MIMO performance conduction test system can simultaneously satisfy the simultaneous change of the channel amplitude and phase of thousands of streams.

The invention discloses a resonant type fiber-optic gyro coherent demodulation system and method based on interference of externally added light beams. The system includes a laser, a first polarization-maintaining coupler, a Y-branch phase modulator, a phase modulator, an optical fiber resonant cavity, a second polarization-maintaining coupler, a third polarization-maintaining coupler, a first photoelectric detector, a first band-pass filter, a local carrier generation module, a first local carrier phase shift module, a first 90-degree phase shift module, a first multiplier, a second multiplier, a first low-pass filter, a second low-pass filter, a third multiplier, a third low-pass filter, a first digital phase-lock amplifier, a PI servo loop, a fourth polarization-maintaining coupler, a second photoelectric detector, a second band-pass filter, a second local carrier phase shift module, a second 90-degree phase shift module, a fourth multiplier, a fifth multiplier, a fourth low-pass filter, a fifth low-pass filter, a sixth multiplier, a sixth low-pass filter, and a second digital phase-lock amplifier. By local recovery of a carrier with high signal-to-noise ratio, the signal-to-noise ratio of a demodulated signal is improved, the influence of laser frequency noise is reduced, and the resonant type fiber-optic gyro coherent demodulation system and method have important scientific significance and application value.

The invention discloses a method and a device for sampling a high-speed serial signal in a SerDes technology. The method comprises the following steps of (1) receiving an original signal at a Serializer receiving terminal, taking a clock with the degrees of 0, 45, 90, 135, 180, 225, 270 and 315 as a sampling clock, and outputting an initial sampling signal under the control of each phase of the sampling clock; and (2) shifting the phase of the clock with the degrees of 45, 135, 225 and 315 in a 8-phase sampling clock forwards for 45 degrees, keeping the rest four phases invariable to obtain a phase adjustment clock, controlling eight initial sampling signals to perform phase adjustment, acquiring four groups of sampling signals of which every two are the same, performing synchronous latch, and outputting the signals to a subsequent deserializer. The device comprises eight parallel sampling modules, eight phase adjustment modules and a phase shifting module. The method has the advantages of simple implementation method, low cost, integral sampling data and high efficiency.

The invention discloses a vacuum degree online monitoring instrument for a vacuum arc-extinguishing chamber. The vacuum degree online monitoring instrument for the vacuum arc-extinguishing chamber is based on a coupling capacitance method, has temperature and voltage compensation and is high in accuracy. The vacuum degree online monitoring instrument for the vacuum arc-extinguishing chamber is provided with a coupling capacitance sensor arranged inside a shielding box (1), a temperature sensor is further arranged inside the shielding box (1), the coupling capacitance sensor is connected with a single chip microcomputer sequentially through a signal conditioning module A, a phase shift module A and a differential amplification module, an automatic zero setting module feeds back the output of the single chip microcomputer to the differential amplification module, and the output of the differential amplification module is connected with a display; the vacuum degree online monitoring instrument for the vacuum arc-extinguishing chamber is provided with a voltage sensor, and the voltage sensor is connected with the differential amplification module sequentially through a signal conditioning module B and a phase shift module B, the temperature sensor is connected with the single chip microcomputer.

The invention provides a microstrip switch type phase shifter and a phase shifting module using the same. The microstrip switch type phase shifter comprises a reference branch circuit, a phase shifting branch circuit, a first path selection switch and a second path selection switch, wherein the reference branch circuit comprises a first microstrip transmission line; the phase shifting branch circuit comprises a second microstrip transmission line and a third microstrip transmission line which are connected in series, and a fourth microstrip transmission line connected between a node between the second and third microstrip transmission lines and the ground level; the front end of the first path selection switch is connected to a signal input end, the rear end of the second path selection switch is connected to a signal output end, and the first and second path selection switches are simultaneously connected to the reference branch circuit and the phase shifting branch circuit under control. By adopting continuous microstrip lines and a simple topological structure, the phase shifter and the phase shifting module reduce parasitical parameters caused by discontinuous microstrip lines, can be applied to high-frequency scenarios, meanwhile, have very flat phase shifting characteristic nearby center frequency by simulation and experimental proof, and have high phase shifting precision.

The invention provides a transceiver, a receiving channel, a transmitting channel calibration method and device, a signal transceiving system, a storage medium and an electronic device. The transceiver comprises a power division module and more than two paths of signal receiving and transmitting processing equipment, wherein each path of signal transceiving processing equipment comprises a transceiving common attenuation module, a transceiving common phase shift module and a transceiving front-end processing module, wherein the transceiving common attenuation module is connected with a power division module, and the transceiving common attenuation signals are used for performing attenuation processing on received or to-be-sent signals; the transceiving common phase shift module is connected with the transceiving common attenuation module, and is used for adjusting the phase of the received or to-be-sent signal; one end of the transmitting-receiving front-end processing module is connected with the transmitting-receiving common phase shift module, and the other end of the transmitting-receiving front-end processing module is connected with an antenna used for receiving or transmitting signals. Through the method and the device, the problem of complex links and large occupied area of a channel calibration part in the prior art is solved.

An embodiment of the invention discloses a method and a circuit for eliminating errors and a duty ratio detection circuit. The circuit for eliminating errors comprises a compensation phase-shift module and a counting control module. Quantized signals are acted on an input end of the compensation phase-shift module, sampling signals are acted on another input end of the compensation phase-shift module, and an output end of the compensation phase-shift module is connected with an input end of the counting control module. By the aid of the circuit for eliminating error, an error of the average duty ratio obtained only exists on a quantized high level or the last sampling signal, and errors are greatly reduced.