63 results about "Differential phase" patented technology

The invention provides a device and method for manipulating and regulating the bandwidth of a quantum compression state light field, and belongs to the technical field of optics. The problems that an experiment system is complex and high in cost due to the fact that existing bandwidth compression manipulation experiments depend on additional optical devices are solved. The device comprises an optical module, a data acquisition module and a data processing module, two BHDs are used for detecting noise variances of an upper sideband mode and a lower sideband mode based on compression carrier symmetry respectively, then an oscilloscope and a spectrum analyzer are used for detecting time domain signals and frequency domain signals of the BHDs respectively, and broadband compression state light field noise distribution is obtained. A collected time domain signal is post-processed by using an LPSD algorithm, and frequency-dependent differential phase shift is introduced into an upper sideband mode, so that bandwidth compression control of low-pass filtering, high-pass filtering and band-pass filtering effects can be realized.

A system for calibrating the multi-element antenna can include a computer including a processor and memory, wherein the memory stores instructions executable by the processor to detect a location of a laser signal incident on a receiving surface, the laser signal having been reflected from a reflector positioned over an area of a multi-element antenna. The instructions may additionally include instructions to compute a differential phase of an element of the multi-element antenna based on the detected location of the incident laser signal.

The invention relates to the technical field of radio frequency, and discloses a differential phase self-calibration single-power-supply variable gain distributed balun circuit which comprises a differential phase calibration module, an ultra-wideband matching gain adjustment module and a distributed balun amplifier core module connected with the differential phase calibration module and the ultra-wideband matching gain adjustment module. On the basis of a traditional differential-to-single-ended distributed balun circuit, the defect that a traditional distributed balun needs multiple sets of power voltages is overcome by only needing one set of power voltages, and meanwhile, the distributed balun circuit provided by the invention also has a digital gain calibration function, so that the balun has a higher degree of freedom in use. In addition, a differential signal self-calibration circuit is further used, and it is guaranteed that the phase error of balun differential input is minimized.

The invention relates to the technical field of intelligent peripherals, in particular to a user-oriented interaction information expansion method, which comprises the following steps that: each keycap acquires displacement and pressure, generates an event packet, uploads the event packet through an optical wireless link, and obtains a clock and supplies power; constructing a keycap graph by a master controller, obtaining an intention vector through graph convolution and pooling, inputting the intention vector into a cyclic network to generate a pixel matrix and a phase matrix, and downlink after Bernoulli sparse coding; performing key cap side orthogonal matching pursuit decoding and four-round gradient optimization, and outputting a differential pixel set, a differential phase set and a synchronization mark; the master control refreshes the digital micromirror array and the ultrasonic phased array in a differential manner, locks a frame-level time sequence through a synchronization pulse, compensates link delay and hardware drift in real time based on Kalman filtering, and keeps an optical-acoustic alignment error to be less than 100 microseconds; degradation monitoring enables a link to be automatically switched to a pre-carved character layer and to be quickly recovered when the link is abnormal, and a keyboard interaction information expansion scheme with low delay and high consistency is provided.

Embodiments described herein are directed to a position sensor that includes a first receiver coil electrically coupled to a first multiplier to generate a first output, a second receiver coil electrically coupled to a second multiplier to generate a second output, a transmitter coil electrically coupled to an oscillator, the oscillator electrically coupled to a third multiplier to generate a third output, a phase-locked loop electrically coupled to the oscillator and the transmitter coil, a summing circuit configured to receive the first output and the second output and configured to generate a signal, a phase detector configured to receive the signal and the third output, the phase detector outputting a sense signal that is indicative of an angle of the motor position sensor, and a pair of op amps electrically coupled to the phase detector. The op amps configured to output an analog differential signal and a differential phase signal.

The invention discloses a differential bridge structure and a differential circuit structure. The differential bridge structure can comprise a differential power division network, a first differential phase shift network and a second differential phase shift network, wherein the differential power division network, the first differential phase shift network and the second differential phase shift network are constructed based on coupling transmission lines; the differential power division network is configured to divide an input signal into two paths of differential signals and output the two paths of differential signals to the first differential phase shift network and the second differential phase shift network respectively; the first differential phase shift network and the second differential phase shift network are respectively configured to output the differential signal as an output signal whose phase difference is a preset difference value including 90 DEG. The differential bridge structure disclosed by the invention has good broadband characteristics, realizes high-precision phase control, and can output and maintain 90-degree phase difference signal output.

The invention discloses an interference fading point compensation method for a coherent phi-OTDR (Optical Time Domain Reflectometer), which comprises the following steps of: identifying an interference fading point on the basis of complex envelope characteristics obtained by coherent receiving and I / Q (Input / Output) demodulation, and performing interpolation reconstruction on a fading point echo vector by using a neighborhood non-fading point on a complex plane, so as to recalculate a phase and a differential phase; therefore, phase demodulation failure and differential phase artifacts caused by fading can be suppressed. According to the method, on the premise of not increasing hardware transformation, differential phase artifacts and abnormal stripes caused by phase demodulation failure at a fading point are reduced, the stability of a differential phase result and event identifiability are improved, and relatively low calculation complexity is kept to adapt to offline or quasi-real-time processing.

A method, phase shifter, and user equipment (UE) for transmitting and receiving signals in a phased array are disclosed. The method includes receiving a transmit single-ended input signal on a single-ended side of a balun of the phase shifter and generating a transmit differential input signal on a differential side of the balun through the balun; generating a transmit in-phase signal and a transmit quadrature signal based on the transmit differential input signal through a differential quadrature coupler of the phase shifter; and combining the transmit in-phase signal and the transmit quadrature signal into a differential phase-shifted output signal through a differential attenuator of the phase shifter.

The application discloses a differential phase encoding optical communication method, device and system based on probability shaping, relates to the technical field of optical communication, and the differential phase encoding optical communication method based on probability shaping comprises the following steps: at a sending end, the probability of differential phase occurrence is changed, so that the code type with small phase change has a large occurrence probability, and the code type with large phase change has a small occurrence probability, so as that the spectrum of a sending signal is compressed; and a sending signal with compressed spectrum is modulated and transmitted. The application can keep the signal processing structure of the original system unchanged, effectively reduce the signal bandwidth through the coding mode, reduce the ISI between code types, and improve the system performance.

The present invention discloses a radar vibration signal extraction method and device. The method comprises: performing pulse compression processing on the radar echo signal after being reflected by a vibrating target to obtain a range compression signal of the echo signal; performing peak detection to obtain the signal fundamental frequency of the range compression signal; performing periodic filtering on the range compression signal using a frequency domain periodic filter established according to the signal fundamental frequency to obtain a periodically filtered signal; performing clutter estimation on the periodically filtered signal to obtain a clutter-removed signal; performing differential interferometry to obtain the differential phase of the clutter-removed signal; performing accumulation processing to obtain a radar vibration target deformation inversion result; and performing low-pass filtering to obtain a radar vibration target deformation inversion result after filtering out deformation noise. The present invention is used to improve the extraction accuracy of radar vibration signals and improve the accuracy of estimating stationary clutter in radar vibration signals.

The application discloses a method for compensating internal skew of a differential via channel, comprising the steps of: calculating skew time between differential signals; using obtained material parameters to establish a model of a PCB and a differential via; simulating the established high-precision differential model to obtain S parameters of the differential via structure through simulation; obtaining S parameters and differential internal skew values of a design measurement to calibrate a scale factor of 3D modeling; optimizing stub length difference h in the differential via structure; comparing whether the optimization result meets a design allowed differential internal skew target value, if yes, optimization is completed, and if not, stub length difference h is continuously optimized. The application occupies small layout and wiring space, and the proposed differential via structure compensates for skew of differential phase in time, effectively avoiding the influence of internal skew.

The invention provides a signal modulation method, a decision feedback equalizer and a storage medium. The method comprises the following steps: performing amplitude estimation on a modulation signal x (t) to obtain an amplitude estimation value a (t) of a current period; the amplitude estimation values a (t-1), a (t-2),..., a (t-M + 1) and the amplitude estimation value a (t) in the past M-1 periods are balanced, an amplitude balance result z (t) is obtained, and M is an integer larger than 1; the differential phase p (t-i) of the modulation signal x (t) is determined, the differential phase p (t-i) is a differential phase result of x (t) and x (t-i), and i is an integer larger than 0; balancing the differential phases p (t-1), p (t-2),..., p (t-N + 1) in the past N-1 periods to obtain an actual differential phase w (t), N being an integer greater than 1; recovering the actual differential phase w (t) to a normal signal phase v (t); and demodulating to obtain a modulation result y (t) corresponding to the modulation signal x (t) according to the amplitude equalization result z (t) and the signal phase v (t). According to the signal modulation method provided by the invention, the equalization performance of the decision feedback equalizer can be improved.

Embodiments described herein are directed to a position sensor that includes a first receiver coil electrically coupled to a first multiplier to generate a first output, a second receiver coil electrically coupled to a second multiplier to generate a second output, a transmitter coil electrically coupled to an oscillator, the oscillator electrically coupled to a third multiplier to generate a third output, a phase-locked loop electrically coupled to the oscillator and the transmitter coil, a summing circuit configured to receive the first output and the second output and configured to generate a signal, a phase detector configured to receive the signal and the third output, the phase detector outputting a sense signal that is indicative of an angle of the motor position sensor, and a pair of op amps electrically coupled to the phase detector. The op amps configured to output an analog differential signal and a differential phase signal.

Methods and systems of the present disclosure include removing the effects of certain types of noise from collected data that may affect the accuracy of determinations made using the collected data. Such methods may be used to separate data associated with acoustic energy traveling along a casing from other data included in a dataset. “Data of interest” may be identified based on known modes of energy propagation through a wellbore casing. The velocities of energy traveling along a wellbore casing may be known based on known characteristics of the casing. Data associated with acoustic wave modes not related to the casing may be removed from the dataset. The data of interest may then be evaluated when cement bond index values are assigned to different portions of the casing. The casing may be placed into operation when the cement bond index values of the casing correspond to an acceptance criterion.

This invention belongs to the field of distributed optical fiber sensing technology and relates to a method for synergistic suppression of phase noise and distortion in optical frequency domain reflection using coded differential methods. The method includes: acquiring upper and lower sweep beat frequency signals; separating the upper and lower sweep beat frequency signals to obtain an upper sweep beat frequency signal and a lower sweep beat frequency signal; acquiring the upper and lower sweep beat frequency electrical signals; delaying the upper sweep beat frequency electrical signal by a spatial resolution and then mixing it with the lower sweep beat frequency electrical signal, or delaying the lower sweep beat frequency electrical signal by a spatial resolution and then mixing it with the upper sweep beat frequency electrical signal, to obtain a mixed signal with phase noise and frequency domain distortion suppressed, and analyzing the Fourier frequency domain spectrum of the mixed signal. This invention also provides a system for synergistic suppression of phase noise and distortion in optical frequency domain reflection using coded differential methods, including a positive and negative double-sideband sweep frequency acquisition device, a beam splitter, a spread spectrum device, an interferometer, a beat frequency signal acquisition device, and an electrical delay unit. This invention can effectively suppress phase noise and frequency domain distortion noise.

The invention belongs to the technical field of wireless communication, discloses a high-precision frequency synchronization method for an OTFS system, and provides a coarse and fine carrier frequency offset hierarchical estimation scheme for solving frequency offset by mainly using a differential phase between adjacent symbols and solving the problem of poor frequency offset estimation precision in the existing frequency synchronization algorithm. Coarse frequency offset estimation compensates carrier frequency offset to a working range of fine frequency offset estimation while ensuring a frequency offset estimation range, then the fine frequency offset estimation is utilized to further improve estimation precision, and the frequency offset estimation method provided by the invention achieves estimation precision close to a theoretical limit with low implementation complexity, and has a wide application prospect. Compared with a traditional single-stage frequency offset estimation method, the method has obvious advantages.

A micro-strip transmission line is connected with a differential phase shift transmission line, the differential phase shift transmission line is connected with a top layer radiation patch through an impedance gradient transmission line, a bottom layer grounding plate is provided with an inverted T-shaped groove, a parasitic radiation patch is embedded in the groove, and an impedance tuning circular ring patch is arranged on a strip branch knot of the parasitic radiation patch. According to the invention, the broadband coverage and stable impedance matching are realized, the radiation performance is optimized, the miniaturization characteristic is realized, the miniaturization requirement of consumer electronics can be adapted, and the equipment cost and the assembly complexity are reduced.

The invention discloses an SPR phase imaging system based on a four-polarization filtering array, and the system comprises an incident light path which is used for generating area array laser; the SPR module is used for receiving the area array laser and carrying out SPR sensing to obtain an area array laser modulation result related to a to-be-detected substance; and the imaging light path is used for carrying out amplification and filtering modulation on the area array laser modulation result so as to carry out imaging on a four-polarization array, and carrying out matched filtering and double-differential phase resolving on a four-polarization image so as to obtain an imaging result. According to the invention, through polarization virtual image generation and cross-channel block matching, and in combination with four-dimensional collaborative filtering, the noise suppression efficiency is improved; and through double differential phase resolving, the dynamic range is expanded to 0.06 RIU, and the resolution ratio is superior to that of the RIU. The invention solves the problem of mutual restriction of dynamic range and resolution in the traditional SPR technology, and is suitable for high-sensitivity biomolecule interaction detection.

The application discloses a differential phase and attenuation joint estimation method for dual-polarized weather radar, improves the precision of phase and attenuation estimation by adaptively adjusting gamma H and gamma DP under high resolution, and reduces the deviation caused by delta HV and noise. The differential phase and attenuation joint estimation method can be applied to dual-polarized weather radar of any wave band, especially high frequency wave bands such as X, Ku and Ka wave bands, and the improvement effect is more remarkable. The application improves the precision of differential phase estimation and attenuation correction, and helps to improve the accuracy of quantitative precipitation estimation. In addition, the application does not introduce new parameters, only adaptively adjusts the relationship formula coefficient between attenuation and differential phase shift rate, and therefore can be applied to radar DSP to realize real-time processing of data.

The application discloses a laser phase noise measurement method based on delay self-heterodyne and digital demodulation, and relates to the technical field of laser measurement, and comprises the following contents: after being adjusted by a variable optical attenuator, to-be-measured laser is divided into a frequency shift arm and a delay arm, the frequency shift arm is frequency-shifted by an acousto-optic modulator, the delay arm is delayed by a delay optical fiber, and original electric beat frequency signals are obtained by a balanced photoelectric detector after the two arms are coupled; homologous and synchronous quadrature demodulation is carried out on the original electric beat frequency signals, envelope credibility judgment and abnormal sample repair are combined, and a continuous differential phase sequence is obtained; actual optical time delay is determined according to the beat frequency spectrum characteristics and the continuous differential phase sequence, and a differential phase power spectral density is formed; then, transmission relationship conversion is carried out according to the actual optical time delay, bounded spectrum compensation is implemented on a zero point neighborhood and a low credibility frequency point, and an intrinsic phase noise power spectral density is obtained. The application can improve the stability, continuity and result credibility of phase noise measurement under the condition of short delay.

The invention relates to the technical field of liquid crystal antennas, and discloses a differential feed liquid crystal antenna based on a glass via hole. The antenna is composed of upper and lower glass substrates and a middle liquid crystal layer, the surface of the upper glass substrate is provided with a patch antenna and a ground layer, the lower glass substrate is provided with a differential feed line, and the patch antenna and the ground layer realize efficient electromagnetic coupling and differential feed through glass via holes and copper column via holes. The differential feeder line adopts a 180-degree delay line to realize differential phase shift, and the dielectric constant of the liquid crystal layer is utilized to dynamically adjust the feed phase, so that the flexibility and adaptability of the antenna are enhanced. The antenna aims to solve the problems of easy signal interference, large loss and low electromagnetic coupling efficiency under high frequency, is suitable for the field of high-frequency communication, and has a wide application prospect.

A data processing device is provided, including a spectrum extraction circuit configured to receive a first electrode signal and obtain a first component signal having a first preset frequency in the first electrode signal; an amplitude and phase extraction circuit, electrically connected to the spectrum extraction circuit, configured to generate a differential phase-shift keying signal, the differential phase-shift keying signal includes a real part of phase and an imaginary part of phase of the first component signal; a demodulation circuit, electrically connected to the amplitude and phase extraction circuit, configured to demodulate the differential phase-shift keying signal according to a phase angle to obtain data information in the first electrode signal, the phase angle is an arctangent value of a ratio of the real part of phase to the imaginary part of phase.

An efficient structure and methodology are provided for coherent signal processing in optical access networks. Differential phase-shift keying (DPSK) modulation is used for coherent passive optical networks. The use of DPSK modulation can reduce the complexity of a receiver of an optical network unit by improving the receiver tolerance to frequency offsets. A system can comprise an optical line terminal having a coherent transmitter configured to transmit an optical signal over an optical fiber channel to a coherent receiver in an optical network unit of a passive optical network, and a DPSK modulator coupled to the coherent transmitter to code the optical signal transmitted. The coherent receiver of the optical network unit of the passive optical network can be coupled to a DPSK demodulator.

The invention relates to the technical field of wireless communication, in particular to a frame header detection method and system for a satellite television broadcasting system, and the method comprises the steps: monitoring a radio frequency end in real time, collecting baseband IQ data to be subjected to frame header detection from the radio frequency end, and carrying out the calculation to obtain a differential phase of the baseband IQ data to be subjected to frame header detection; obtaining synchronous word symbols, and constructing a phase difference query table based on the synchronous word symbols; performing rotation adjustment on elements of a differential phase of the baseband IQ data to be subjected to frame header detection according to the phase difference query table, and then calculating the sum of phase differences; and calculating and obtaining frame header position information of the baseband I Q data to be subjected to frame header detection based on the phase sum. According to the invention, the problem of balancing the anti-frequency-offset performance and the anti-noise performance in the prior art is solved, the system architecture is simplified, and a more efficient and reliable synchronous detection means is provided for a satellite television broadcasting system.

The invention relates to a method for determining the position and / or orientation of a receiver array having a plurality of receiving antennas, in particular N A receiving antennas, by means of an estimation, wherein the following steps are carried out in the method: emitting a respective signal by means of at least one transmitter at different positions, in particular at N R positions, and evaluating the spatially characteristic phase progression of the wave field of each emitted signal with the aid of the plurality of receiving antennas of the receiver array. At least one measured differential phase of at least one antenna pair of the receiving antennas is compared at the receiver with hypothetical differential phases of the same antenna pair resulting from the positions and orientation of the receiver.

In one embodiment, a system for a vehicle includes a radio frequency (RF) transceiver having an identification (ID), and a processor coupled with the RF transceiver. The processor is configured to receive a request, via a first wireless connection, for the vehicle to travel to a location, in response to the vehicle being less than a predetermined distance from the location, receive RF packets, via a second wireless connection, from a target at the location, identify packets based on the ID of the RF transceiver, extract received signal strength indicator (RSSI) data from received signals associated with the identified packets, filter the RSSI data to obtain a maximum RSSI signal within a window of time, and in response to the maximum RSSI signal exceeding a threshold, output a signal indictive of the target being less than a predetermined distance from the vehicle.

A phase shifter includes an I / Q generator that generates an in-phase signal and a quadrature-phase signal based on an input signal, a vector synthesis circuit that generates a first differential signal pair and a second differential signal pair based on the in-phase signal and the quadrature-phase signal, and generates an output signal based on the first differential signal pair and the second differential signal pair, a first digital-to-analog converter (DAC) that transmits first and second current control signals to the vector synthesis circuit to control the in-phase signal, and a second DAC that transmits third and fourth current control signals to the vector synthesis circuit to control the quadrature-phase signal. The vector synthesis circuit includes a first common-source amplifier, a second common-source amplifier, a third common-source amplifier, and a fourth common-source amplifier.

This invention relates to the field of radio frequency technology and discloses a differential phase self-calibrating single-supply variable gain distributed balun circuit, comprising: a differential phase calibration module, an ultra-wideband matching gain adjustment module, and a distributed balun amplifier core module connecting the differential phase calibration module and the ultra-wideband matching gain adjustment module. Based on the traditional differential-to-single-ended distributed balun circuit, this invention requires only one power supply voltage, overcoming the drawback of traditional distributed baluns requiring multiple power supply voltages. Furthermore, the distributed balun circuit proposed in this invention also has a digital gain calibration function, providing greater flexibility in balun usage. In addition, this invention uses a differential signal self-calibration circuit to ensure that the phase error of the differential input of the balun is minimized.

The invention discloses a quantum key distribution method and device based on differential phase shift, and the method comprises the steps: (1), a transmitting end generates an output signal, the output signal is a signal photon pulse with the phase of 0 or pi, or a decoding pulse is randomly inserted into the signal photon pulse with the specified phase to form a trigger photon pulse; (2) detecting an output signal sent by the sending end by a receiving end, and entering an eavesdropping behavior monitoring mode after detecting a trigger photon pulse; and (3) in an eavesdropping behavior monitoring mode, the receiving end calculates the probability that the two photon detectors used for detecting signal photon pulses simultaneously generate photon detection in the monitoring time window, and if the probability is lower than a set probability threshold, it is determined that an eavesdropping behavior exists at present. The eavesdropping behavior is monitored based on the randomly generated trigger photon pulse, and after the existence of the eavesdropping behavior is detected, the related key bits of the receiving end and the sending end are synchronously deleted, so that the risk that the bit error caused by noise is regarded as eavesdropping is reduced.

A system is provided to analyze distortion in an electronic or electromechanical device, which may include testing with one or more modulated signals and / or with one or more demodulators. In one embodiment a change in pitch (or frequency) is measured at an output of the device. One or more signals from a demodulator output may be measured for an amplitude, noise, phase, aliasing, spurious signal, and / or frequency modulation effect.