971 results about "Phase shifted" patented technology

The invention provides a VDSL ultra-low time delay communication method and system, and relates to the technical field of communication, and the method comprises the steps: encrypting a clock synchronization channel through a quantum key distribution protocol, dynamically dividing micro time slot resources in an orthogonal frequency division multiplexing symbol period, and generating a dynamically adjusted micro time slot resource distribution result; calculating an optimal phase offset matrix of the metasurface intelligent reflecting surface through a depth deterministic strategy gradient algorithm to obtain an optimized electromagnetic wave propagation path; generating a global optimization check matrix by aggregating the locally trained lightweight error correction model gradient of each node to obtain a compensated data stream; and constructing a causal graph model dynamic pruning high-entropy path to minimize causal entropy, through multi-agent reinforcement learning, taking time delay-energy efficiency as a game target to decide an optimal modulation order and a subcarrier switching strategy, and obtaining an optimized stable communication link. According to the invention, high-reliability and low-delay communication basic support is provided for high-precision intelligent manufacturing.

The invention provides a control method and system for a surface shape of an optical device, and the method comprises the steps: carrying out the initial grinding and polishing of the optical device, carrying out the real-time detection through a multi-frequency-band stress detector, obtaining the stress distribution and surface wave front data, and obtaining an initial detection result; a phase shift interferometer and a composite laser confocal probe are used to carry out depth surface shape measurement based on the initial detection result, and adaptive finishing is carried out on an abnormal area to obtain a surface shape finishing log; according to the initial detection result and the finishing log, executing step-by-step load irradiation and stress tracking, and collecting surface shape change under photo-thermal coupling to obtain surface shape evolution information; and according to the surface shape evolution information, performing partition dynamic compensation and real-time detection until a surface shape control result meeting requirements is obtained. According to the method, secondary deformation caused by internal stress release is recognized and corrected through combination of multi-frequency-band stress detection and high-precision interference measurement, high-precision control over the surface shape of the optical device is achieved, and the method is suitable for scenes with high requirements for the surface shape of the optical element.

The invention relates to the technical field of electrical detection, in particular to an electricity meter load monitoring method and system based on an electric energy quality analyzer, and the method comprises the following steps: extracting three-phase voltage phase deviation characteristics in a disturbance period, combining with the comparison of a frequency band change trend and fundamental frequency power, recognizing an interference coupling section, and analyzing a jump frequency point; and outputting an ammeter load monitoring result. According to the method, the phase deviation angle of the three-phase voltage is extracted in the voltage disturbance period, and the cross-phase synchronization index is constructed, so that the synchronous response characteristics of different loads to disturbance can be accurately revealed, and the accuracy of load response attribution judgment is enhanced. On the basis of cross-phase synchronous analysis, a corresponding relation between frequency band characteristics and response attribution is constructed, so that load response subdivision has a phase difference identification capability and a frequency behavior calibration capability, and the discrimination robustness under a multi-source interference background is improved.

The invention discloses a waveguide array gas sensing system for high-sensitivity multi-gas detection. The waveguide array gas sensing system comprises a waveguide substrate, and a waveguide Bragg grating, a phase shift Bragg grating, a micro-ring resonator, a Mach-Zehnder interferometer, a waveguide array, an electric field regulation and control module and a signal processing unit which are arranged on the waveguide substrate. Through the waveguide array structure, topological optical protection adsorption and other technologies, the sensitivity and selectivity of methane, carbon dioxide and other gases are effectively improved, and accurate detection can be achieved in a complex environment; according to the invention, a topological optical principle is adopted, signal loss caused by environmental noise or surface defects is reduced, and the stability of the sensor is improved; according to the invention, automatic calibration and temperature and humidity compensation of the system are realized, and autonomy and operation convenience of the system are enhanced; the system has high environment adaptability and can stably work under different temperature and humidity conditions.

The invention relates to the technical field of power electronics, the embodiment of the invention provides an enhanced network construction type SVG control method and system for suppressing broadband oscillation, the method comprises a network construction type control process and an additional damping control process, and the network construction type control process at least comprises: based on a direct-current voltage and frequency loop and an alternating-current voltage and amplitude loop, the additional damping control process is carried out; generating a virtual internal potential; generating a three-phase current instruction and a modulation wave based on the virtual internal potential, the virtual impedance and the fast current inner ring; based on the modulation wave, a converter trigger pulse signal is generated and transmitted; the additional damping control process at least comprises the following steps: detecting an oscillation frequency point based on a full-band scanning algorithm; extracting an oscillation frequency point, and generating an oscillation voltage without phase shift; virtual impedance is adjusted according to the impedance amplitude and the phase relation; and correcting negative damping based on the adjusted virtual impedance.

An apparatus includes a waveguide and one or more partially reflective surfaces embedded inside the waveguide, wherein each of the one or more partially reflective surfaces includes a multi-layer coating structure, wherein a first portion of the multi-layer coating structure induces an overall phase shift of light propagating through the first portion of the multi-layer coating structure and wherein a second portion of the multi-layer coating structure is selected to decrease the overall phase shift.

The invention provides a circulation power optimization method and system for a three-phase dual-active bridge, and relates to the field of power electronics, the method comprises the following steps: determining an optimal backflow modulation strategy set corresponding to a hybrid modulation group, the hybrid modulation group comprising triangular wave modulation, trapezoidal modulation, synchronous modulation and extended phase shift modulation, the optimal backflow modulation strategy set corresponding to the hybrid modulation group comprises modulation modes and degree-of-freedom relationships corresponding to different transmission power per unit value ranges in different voltage conversion ratio ranges; determining a degree of freedom and power relationship set corresponding to the hybrid modulation group, wherein the relationship set comprises a relationship between the degree of freedom and power of different transmission power per unit values corresponding to each mode; the phase shift angle, the primary side duty ratio and the secondary side duty ratio are determined by combining the real-time voltage conversion ratio and the real-time virtual power per unit value, operation of the three-phase dual-active bridge is controlled, and the method has the advantages of reducing complexity and improving portability and efficiency.

Examples described herein relate to an optical device that entails phase shifting an optical signal. The optical device includes an optical waveguide having a first semiconductor material region and a second semiconductor material region formed adjacent to each other and defining a junction therebetween. Further, the optical device includes an insulating layer formed on top of the optical waveguide. Moreover, the optical device includes a III-V semiconductor layer formed on top of the insulating layer causing an optical mode of an optical signal passing through the optical waveguide to overlap with the first semiconductor material region, the second semiconductor material region, the insulating layer, and the III-V semiconductor layer thereby resulting in a phase shift in the optical signal passing through the optical waveguide.

The invention discloses a non-equal period phase shift phase unwrapping method, which comprises the following steps of: 1, constructing a wavelength-De Bruijn element mapping table, and generating a non-equal period phase shift stripe group; 2, projecting the phase shift fringes to a measured object frame by frame, obtaining a modulation pattern, and decoding the modulation pattern to obtain a non-linear wrapped phase; 3, constructing an approximate phase to carry out local phase unwrapping on the nonlinear wrapped phase to obtain a nonlinear local phase; and 4, calculating a phase order by minimizing a nonlinear error on the nonlinear local phase, performing phase unwrapping in combination with a nonlinear wrapped phase, and obtaining a linear absolute phase of the measured object through piecewise linear mapping. According to the measurement method, high-precision absolute phase calculation can be realized only by using three projection patterns, and the three-dimensional measurement efficiency is greatly improved.

Within integrated photonic circuits the ability to induce an optical phase shift allows multiple circuit elements to be implemented including, for example, modulators and optical switches. It is beneficial to achieve lower power consumption for these phase shift elements to reduce overall power consumption of the photonic circuits and their associated drive circuits. Exploiting processing techniques for microelectromechanical systems (MEMS) designs are outlined for high efficiency thermo-optic phase shifter elements with suspended elements that improve thermal isolation and counteract stress induced phase shifts that reduce the thermal induced phase shift. MEMS based spring structures provide both mechanical support and thermal pathways for improved responsivity. Other designs employ direct MEMS based modification of the waveguide path length without exploiting thermal based index changes.

The invention relates to the technical field of phased-array antennas, in particular to a common-caliber simultaneous multifunctional phased-array antenna wave control system, which uses a common-caliber antenna array, comprises N phased-array antennas and N TR components, and realizes caliber sharing through staggered layout. And a wave control system is used for calculating a wave beam control command by utilizing embedded software, controlling phase shift and attenuation of the TR component and processing internal and external interface communication. The feed network is used for signal distribution, and uniform distribution and transmission efficiency are ensured. A Beidou system is used for providing time synchronization and positioning information, and accurate beam control of the beam control system in a complex electromagnetic environment is guaranteed. A channel is used for receiving antenna array signals, control signals are sent to the TR assembly, and accurate transmission of the signals is ensured. According to the invention, the problem that the existing wave control system cannot perform multi-beam control on the common-caliber multifunctional phased-array antenna at the same time is solved, and the target of multi-beam control in the single shared antenna caliber is realized.

The present disclosure relates to the technical field of electromagnetic wave sensors, in particular to a signal transmitting, calibration, compensation and transceiving links, an integrated circuit, an electromagnetic wave sensor and a device, wherein the transmitting link includes an analog signal source and a digital phase shifter, the analog signal source may be configured to provide an initial analog signal, and the digital phase shifter may be configured to provide a phase shift signal in a digital domain and to perform phase shifting on the initial analog signal based on the phase shift signal, so as to perform a preset phase shifting operation on the initial analog signal, thereby effectively improving the phase modulation resolution and phase modulation accuracy.

A reconfigurable intelligent surface. The reconfigurable intelligent surface comprises a three-layer structure, comprising an artificial microstructure array capable of reflection and transmission within a specific frequency band range. By applying an external voltage to control the on / off of a semiconductor switch, an original phase shift structure is changed, ultimately achieving phase control of reflection and transmission. In addition, the structure is simple, can be realized by a microfabrication means, involves a mature process, and is easy to implement in high-frequency bands such as millimeter-wave and terahertz bands.

Phase-change metasurface waveguide mode converters and photonic computing systems including a phase-change metasurface waveguide mode converter are described. In an embodiment, the phase-change metasurface waveguide mode converter include a plurality of phase-change antennas comprising a phase-change material and protruding from a surface, wherein each phase-change antenna of the plurality of phase-change antennas is configured to scatter an optical waveguide mode and cause a phase shift of light travelling through an optical waveguide optically coupled thereto. In an embodiment, the phase-change metasurface waveguide mode converter includes the plurality of phase-change antennas configured to alternate between a crystalline phase and an amorphous phase.

The utility model relates to the technical field of radio frequency integrated circuits, in particular to a phase shifter circuit and a multi-phase shifter circuit, which comprise an input node, an output node, a first signal path and a second signal path, the first signal path comprises a first switch, a second switch and a decoupling structure, the decoupling structure comprises a first inductor, a second inductor and a third inductor, the first inductor and the second inductor are connected in series, one end of the third inductor is connected to a connecting line node of the first inductor and the second inductor, and the other end of the third inductor is grounded; the second end of the second inductor is connected to the second switch; the second signal path includes a third switch, a fourth switch, and an anti-coupling transformer. The phase shifter circuit provided by the utility model solves the technical problem of poor phase flatness of a phase shift unit in a traditional phase shifter, improves the phase flatness, has broadband operating characteristics and low insertion loss, and reduces the chip area of the phase shifter circuit.

The invention discloses a high-power fast phase inversion switch based on a p-i-n diode, and relates to the technical field of high-power microwave p-i-n diode phase shifting. The inverter switch comprises a rectangular waveguide, 2N loading linear p-i-n diode phase shift circuits which are symmetrically and uniformly arranged on a narrow-side waveguide wall, and a bias power supply which provides bias voltage for the phase shift circuits. According to the invention, the loading line type p-i-n diode phase shift circuit is inserted into the waveguide structure, so that a microwave signal is transmitted along the waveguide transmission line instead of being transmitted along the metal microstrip line, the influence of the power loss of the p-i-n diode on the insertion loss of the phase shift circuit can be reduced, and the overall insertion loss is reduced; and meanwhile, phase inversion is realized by controlling the bias state of a p-i-n diode in the phase shift circuit, and nanosecond switching speed can be realized.

The invention provides a distributed feedback laser with a double-layer grating structure, and relates to the technical field of lasers, the laser forms an InGaAlAs multi-quantum well active region, an upper sampling grating layer and a lower phase shift grating layer on an n-type InP substrate in sequence, the upper grating layer is designed based on a reconstruction equivalent chirp technology, and the lower phase shift grating layer is designed based on a reconstruction equivalent chirp technology. Two sections of asymmetric modulation areas with sampling periods linearly gradually changing in opposite directions are arranged in the axial direction of the resonant cavity, and the lower grating layer is a quarter-wave phase shift grating matched with the period of the upper seed grating. Through the synergistic effect of equivalent phase modulation and phase shift generated by the double-layer grating, the photon density distribution in the cavity can be improved, the longitudinal space hole burning effect can be weakened, the sensitivity to end face phase fluctuation can be reduced, high single-mode power and large modulation bandwidth can be realized in a wide temperature range, and the double-layer grating is suitable for a high-speed optical communication and coarse wavelength division multiplexing transmission system.

The various embodiments described herein include a phase shifter that can have a first electrode that has a distributed shape. The phase shifter can include a second electrode. The phase shifter can include an optical waveguide between the first electrode and the second electrode. Further, the phase shifter can include an active electro-optical material that propagates light, and phase shifts the light.

The invention relates to the technical field of power system court management, and particularly discloses a court identification and user binding method based on a special transformer acquisition terminal, which comprises the following steps: separating harmonic interference generated by start and stop of an electric welding machine through a kurtosis index and time-frequency energy entropy fusion detection method, and extracting a fundamental voltage and a pure power signal; constructing a dynamic time bending model containing phase consistency and gradient feature constraint based on the fundamental wave voltage, and calculating voltage track similarity to judge electrical coupling; for the users with electrical coupling, dynamic weight power cross-correlation analysis is fused to generate a comprehensive decision value, and a space-time diagram neural network is utilized to update a transformer area topology structure online in combination with a historical topology change event, so that the dynamic determination of the transformer area to which the users belong is realized; through multi-dimensional feature fusion and anti-interference algorithm design, the problems of phase deviation and waveform distortion caused by electric welding machine harmonic waves are reduced, and the transformer area identification accuracy and real-time performance are improved.

The invention discloses a non-volatile phase shifter which is ultra compact and low in loss. In the non-volatile phase shifter, signal light is transmitted to the composite hybrid waveguide through the input waveguide and is modulated after passing through the phase change material area of the composite hybrid waveguide, and the phase change material is directly modulated through spatial light, so that the phase of the signal light is modulated. According to the invention, optical pulses with different pulse widths and different powers can be used, and the phase state of the phase change material can be regulated and controlled. The problems of large size area and high power consumption required by electro-optical regulation and control, thermo-optical regulation and control and the like are solved, pi phase shift can be realized in an interaction length as low as several microns, and meanwhile, relatively low loss is kept. According to the invention, the phase change material is regulated and controlled through spatial light, so that the distinguishable level up to 8 bits can be realized, and hyperfine phase regulation and control in an ultra-small structure can be realized. According to the invention, an excellent phase shifter design scheme can be provided for realizing complex photon circuits with ultra-compactness, ultra-low power consumption, low loss and the like.

The invention belongs to the induction type oil abrasive dust sensor technology, and particularly discloses a non-ferromagnetic oil abrasive dust high signal-to-noise ratio induction type detection method and system, and the method comprises the following steps: a microcontroller carries out the control, and sends an instruction to two waveform generation chips through the microcontroller; dual-signal generation: generating two waveform and phase-adjustable periodic signals based on two waveform generation chips; the square wave frequency mixing is used for introducing a square wave as a parameter control signal to carry out frequency mixing operation; and frequency mixing difference adjustment: the optimal signal-to-noise ratio of different non-ferromagnetic chip signals is obtained by adjusting the frequency mixing difference. The frequency mixing difference between the induction signal and the reference signal can be accurately controlled, especially for non-ferromagnetic chips, different frequency mixing differences are adopted to improve the chip signal-to-noise ratio, meanwhile, square waves are introduced to serve as the reference signal to improve the chip signal amplitude, the phase shift process is simplified, the stability of the circuit is improved, and reliable data are provided for subsequent chip signals.

The invention relates to a phase shifter and a base station antenna. The phase shifter comprises a circuit board (10) and a cavity (20), the circuit board (10) is located in the cavity (20), and the circuit board (10) is provided with a grounding connection end (11) and signal connection ends (12) of a plurality of phase shift circuits; the conductive part (70) is arranged in the cavity wall of the cavity (20) in a penetrating manner, and a part of structure of the conductive part (70) is electrically connected with the grounding connection end (11) of the circuit board (10); wherein the cavity (20) is provided with a cavity avoiding hole (22), and the cavity avoiding hole (22) is arranged opposite to the signal connecting end (12) and the grounding connecting end (11), so that the signal connecting end (12) and the grounding connecting end (11) are exposed from the cavity avoiding hole (22). According to the phase shifter and the base station antenna, electroplating-free effect can be realized, the occupied space is small, and the layout of the whole machine can be simplified.

The invention provides a multi-sub-array FD-RIS distance-angle beam regulation and control far field communication method and system, an FD-RIS is uniformly divided into a plurality of sub-arrays, and each sub-array adopts different modulation frequencies to realize diversity of frequency deviation. Besides, in order to control unexpected harmonic signals, a novel time modulation method is utilized to periodically adjust phase shifts of all reflection units of the FD-RIS, and unwanted harmonic signals can be effectively restrained. Different time delays are added in the time modulation process of each component so as to amplify the spatial degree of freedom of the FD-RIS to an expected harmonic signal, and the space control capability of the FD-RIS to the expected harmonic signal is prevented from being limited by a time modulation mode.

The invention provides a liquid crystal antenna array beam control method and device, electronic equipment and a storage medium, and aims at determining a target beam which is most matched with a user demand through switching of a high-gain beam and a low-sidelobe beam so as to meet diversified demands of a user. And determining a target performance requirement to determine a performance optimization direction, and determining a phase shift range to determine a voltage corresponding phase and voltage corresponding loss of the liquid crystal phase shifter corresponding to the target wave beam, thereby realizing a performance optimization effect of improving different types of target wave beams in a targeted manner. And finally, optimizing the target beam according to the phase corresponding to the voltage, the loss corresponding to the voltage and the phase shift range until the optimized target beam meets the target performance requirement, outputting a voltage codebook, obtaining the voltage codebook meeting the user requirement, and meeting the diversified requirements of the user for the liquid crystal antenna array through performance optimization.

A control method of a dual active bridge converter, an energy storage device and a readable storage medium, the control method comprising: determining a feedforward value of an external phase shift angle and an adjustment value of the external phase shift angle according to an electrical parameter of the dual active bridge converter; and controlling the energy conversion of the dual-active bridge converter according to the feed-forward value of the external phase shift angle and the adjustment value of the external phase shift angle. When the dual active bridge converter performs energy conversion according to the generated driving signal, the feed-forward value of the external phase shift angle can be actively adjusted based on the target alternating current so as to adjust the given value of the external phase shift angle, so that the given value of the external phase shift angle can change along with the change of the target power supply current; therefore, the generated driving signal can actively adjust the output actual alternating current in time, and the purpose of reducing the output current or voltage waveform oscillation of the dual-active bridge converter is achieved.

The invention is suitable for the technical field of phased array antenna wave control, and provides a phased array high-precision beam pointing calibration method, a controller and a memory. The method comprises the following steps: acquiring initial phase shift values of K channels of a phased array; performing step-by-step calibration on the initial phase shift values of the K channels of the phased array, and performing accumulation calculation on calibration data obtained by step-by-step calibration through a built-in data mode to obtain forced calibration data; the step-by-step calibration comprises array element calibration, temperature calibration, formula calibration, subarray calibration and forced calibration; the forced calibration data is data after the beam pointing offset error is corrected; obtaining a final phase shift value based on the forced calibration data; the final phase shift value is used for calibrating beam pointing. According to the method provided by the invention, the data storage amount can be obviously reduced under the condition of high-precision beam pointing.

The invention discloses a phased array distributed hierarchical control wave control system and a wave beam control method, and relates to the technical field of signal processing, the wave control system comprises a main control FPGA module, a plurality of sub-control FPGA modules and a plurality of T / R wave beam forming modules; the master control FPGA module is used for receiving a user instruction and outputting a phase shift control instruction according to the user instruction; the plurality of sub-control FPGA modules are in interactive connection with the main control FPGA module, and the sub-control FPGA modules are used for receiving the phase shift control instruction and outputting a phase shift code according to the phase shift control instruction; the plurality of T / R beamforming modules are respectively connected with the sub-control FPGA module and the antenna unit, and the T / R beamforming modules are used for receiving the phase shift codes and performing phase adjustment on the antenna unit according to the phase shift codes, so that not only can beam switching be quickly realized, but also the layout and wiring of a wave control board can be simplified, and the cost is reduced. And meanwhile, the requirements on the resources and the performance of the single FPAG and the cost of a wave control system are effectively reduced.

The invention discloses an RIS-assisted millimeter wave URLLC communication system hybrid precoding design method. Establishing an RIS-assisted downlink millimeter wave URLLC communication system model, and defining a user reachable rate; establishing an optimization problem which takes maximization of a user reachable rate weighted sum as a target and takes digital precoding, analog precoding and an RIS phase shift matrix of a transmitter as variables; introducing an auxiliary variable to simplify a target function, and adding a corresponding constraint condition to ensure the equivalence of an optimization problem; decomposing the equivalent optimization problem into three sub-problems, and calculating optimization variables by using a first-order Taylor expansion technology, a minimum Euclidean distance method and a continuous convex approximation algorithm; and iteratively calculating the absolute value of the difference of the weighted sums of the reachable rates of the corresponding users before and after the optimization variables are updated until a preset termination condition is met. According to the method, the hardware cost of wireless transmission is reduced, and the system performance of URLLC millimeter wave communication is remarkably improved by optimizing the sending direction and phase of the beam.

The utility model relates to the technical field of lasers, and discloses a high-slope-efficiency surface grating surface emitting laser which comprises a substrate, a lower waveguide layer, an active layer and an upper waveguide layer from bottom to top along the cross section. A ridge-shaped waveguide is formed in the middle area of the uppermost layer of the upper waveguide layer, and a Bragg grating is etched on the surface of the ridge-shaped waveguide; the Bragg grating comprises a section of second-order grating located in the middle and two sections of first-order gratings located at the two ends; a lambda / 4 phase shift is arranged in the second-order grating; the lambda / 4 phase shift is located in an etching area or a non-etching area of the first-order grating closest to the second-order grating; when the lambda / 4 phase shift is located in the etching region of the first-order grating closest to the second-order grating, the upward diffraction light power of the second-order grating is maximum, and the downward diffraction light power is minimum; when the lambda / 4 phase shift is located in the non-etching area of the first-order grating closest to the second-order grating, the upward diffraction light power of the second-order grating is minimum, and the downward diffraction light power of the second-order grating is maximum. According to the invention, high-slope efficiency lasing can be realized.

The invention provides a base station antenna, the base station antenna comprises a reflecting plate and a phase shifter, the reflecting plate is provided with a groove, the phase shifter comprises a phase shift circuit, a phase shift medium and a radio frequency ground, the phase shift circuit is covered on an opening of the groove in an insulation manner, the groove wall of the groove forms the radio frequency ground, and the radio frequency ground is arranged in the groove. The phase shift medium comprises a first sliding medium, the first sliding medium is arranged in the groove, and the first sliding medium moves relative to the phase shift circuit to adjust the phase. According to the base station antenna, the phase shifter is integrated on the reflecting plate, and particularly, the phase shifting medium is arranged in the groove in the reflecting plate, so that the size of the antenna is remarkably reduced, the antenna is more compact and light, and the internal space layout of the antenna is optimized.