126 results about "Polarization diversity" patented technology

The invention provides a thermal wave imaging detection method based on nonlinear frequency modulation microwave excitation induction, and the method comprises the steps: constructing a composite excitation module of Gaussian beam and dynamic phase compensation, decomposing high-frequency / low-frequency sub-pulses for alternate emission, synchronously collecting infrared non-uniform sampling and microwave polarization diversity data, and carrying out the detection of the thermal wave imaging. And through feature fusion of a time domain CNN and a frequency domain graph neural network, propagation parameters are iteratively corrected in combination with a thermal diffusion equation model, and defect and deep structure detection is realized. According to the method, the composite excitation structure is combined with high-frequency / low-frequency sub-pulse alternate emission, the micro-defect detection resolution and the deep structure penetrating capacity are remarkably improved, the feature robustness is enhanced through multi-modal data acquisition and cross-modal neural network fusion, detection depth self-adaptive optimization is achieved through a depth compensation model and Kalman filtering, and the detection precision is improved. The parameter precision is improved with the assistance of a terahertz spectrum coupling matrix and Landweber iterative inversion, and finally an advanced detection system integrating efficient excitation, multi-dimensional perception and intelligent analysis is formed.

The invention relates to the technical field of belt conveyor carrier roller fault monitoring, and discloses a belt conveyor carrier roller fault distributed optical fiber monitoring system which comprises a double-light-source DAS system, optical fiber information acquisition, filtering preprocessing, time domain analysis, time-frequency domain analysis, phase analysis, multi-mode feature fusion, fault classification and fault position and grade output. By building a dual-light-source polarization diversity DAS system and combining an adaptive filtering preprocessing technology, high signal-to-noise ratio acquisition and noise reduction processing of vibration signals are realized, dual-light-source orthogonal polarization state transmission effectively suppresses polarization fading, wavelet packet denoising and variable-step LMS filtering collaboratively filter environmental noise and pulse interference, and the noise reduction performance of the vibration signals is improved. Meanwhile, the application of the dynamic weighted root-mean-square value and the continuous wavelet transform ensures the accurate capture of the time domain energy characteristic and the frequency domain time-varying characteristic, and lays a reliable foundation for the multi-modal characteristic fusion.

The invention relates to the technical field of data fusion transmission, and provides a heterogeneous data fusion transmission method and system for airborne multimode satellite communication. Acquiring real-time communication parameters including a dynamic spectrum occupancy state, a polarization direction difference and a hidden transmission demand level; generating a dynamic frequency hopping control instruction based on the time-varying characteristic of the dynamic spectrum occupancy state, driving carrier switching and reserving a spectrum isolation area between adjacent carriers; performing orthogonal polarization diversity analysis on the carrier switching result based on the polarization direction difference, suppressing cross polarization interference and outputting multiple paths of baseband signals; calling a preset waveform parameter library according to the hidden demand level to determine a modulation parameter, and loading the baseband signal to the asymmetric phase subcarrier to generate a hidden modulation waveform; and fusing the frequency hopping instruction and the hidden modulation waveform to generate a cooperative modulation instruction, and controlling the radio frequency unit to realize anti-interference fusion transmission. According to the technical scheme provided by the invention, the anti-interference capability of fusion transmission of multi-mode satellite data in a dynamic spectrum environment is improved.

The invention relates to an optical fiber communication sensing integrated architecture and a working method thereof. Comprising a sensing system laser, a coupler, a polarization beam splitter, a semiconductor optical amplifier, a polarization multiplexing communication transmitting system, a polarization wavelength two-dimensional demultiplexer, namely a WDM-PM device, a coarse wavelength division multiplexer MMI-WDM, a single-mode fiber, a polarization multiplexing communication receiving system, a polarization diversity double-balanced photoelectric detector PBPD, and an ROTDR and phi OTDR data processing unit. According to the invention, not only can high-capacity and long-distance communication under fusion of polarization multiplexing and wavelength division multiplexing be realized, but also sensing and communication can be fused through a wavelength division multiplexing system, the quality of sensing signals is improved through polarization diversity reception on the basis, and mutual promotion of communication and sensing is realized.

An electro-optic receiver includes a polarization splitter and rotator (PSR) that directs incoming light having a first polarization through a first end of an optical waveguide, and that rotates incoming light from a second polarization to the first polarization to create polarization-rotated light that is directed to a second end of the optical waveguide. The incoming light of the first polarization and the polarization-rotated light travel through the optical waveguide in opposite directions. A plurality of ring resonators is optically coupled the optical waveguide. Each ring resonator is configured to operate at a respective resonant wavelength, such that the incoming light of the first polarization having the respective resonant wavelength optically couples into said ring resonator in a first propagation direction, and such that the polarization-rotated light having the respective resonant wavelength optically couples into said ring resonator in a second propagation direction opposite the first propagation direction.

A network node, computer program product, and a method by a network node to allocate at least two beams in a slot to schedule multiple user equipments, UEs, are provided. Each UE is allocated to a baseband port of a plurality of baseband ports such that there is more than one UE allocated to each baseband port. For each baseband port of the plurality of baseband ports: the baseband port is mapped to a polarization of an antenna having multiple polarizations and to one beam of a plurality of beams. The polarization of a baseband port is switched in a time domain to create time diversity of services towards the multiple UEs, wherein a UE is subject to a first polarization for a subset of time occasions and to a second polarization for other time occasions.

The invention provides a polarization diversity and frequency diversity combined low-altitude communication anti-interference system and a channel allocation method, and relates to the technical field of low-altitude communication, and the system is composed of a multi-polarization antenna array, a broadband radio frequency front end, a digital signal processing unit, a self-adaptive controller and an environment sensing module. The core of the invention is a polarization-frequency joint channel allocation method, and global optimal allocation of channel resources is realized by constructing a polarization-frequency two-dimensional channel quality matrix. The system adopts a multi-layer adaptive architecture and comprises a quick response layer and a deep optimization layer, so that the real-time performance and the optimization degree are balanced. In addition, the invention also provides an anti-intelligent interference diversity parameter dynamic adjustment mechanism and an interference identification method based on polarization characteristics, so that the communication reliability and the anti-interference capability of the system in a complex electromagnetic environment are remarkably improved. And communication with an extremely low bit error rate can still be kept in a strong interference environment.

An electro-optic receiver includes a polarization splitter and rotator (PSR) that directs incoming light having a first polarization through a first end of an optical waveguide, and that rotates incoming light from a second polarization to the first polarization to create polarization-rotated light that is directed to a second end of the optical waveguide. The incoming light of the first polarization and the polarization-rotated light travel through the optical waveguide in opposite directions. A plurality of ring resonators is optically coupled the optical waveguide. Each ring resonator is configured to operate at a respective resonant wavelength, such that the incoming light of the first polarization having the respective resonant wavelength optically couples into said ring resonator in a first propagation direction, and such that the polarization-rotated light having the respective resonant wavelength optically couples into said ring resonator in a second propagation direction opposite the first propagation direction.

The invention discloses a dual-frequency dual-polarization duplex phased array for multi-standard communication, aims to solve the technical bottleneck of the existing millimeter wave phased array in frequency band compatibility, polarization diversity and duplex operation, and comprises a millimeter wave broadband dual-polarization end-on-fire antenna and a dual-frequency dual-polarization duplex phased array architecture. According to the phased array established by the invention, four sets of independent beam forming systems are integrated on a single printed circuit board and correspond to a first frequency band vertical polarization channel, a first frequency band horizontal polarization channel, a second frequency band vertical polarization channel and a second frequency band horizontal polarization channel respectively, and concurrent transmission and independent beam control of dual-frequency-band and dual-polarization signals are supported. The phased array realizes two-dimensional expandability based on a brick-shaped framework, can be used for constructing a planar array, and is suitable for a large-scale deployment scene. The compact size and low-cost scheme provides a high-integration, high-flexibility and high-reliability communication solution for B5G / 6G multi-standard scenes such as intelligent transportation, industrial Internet of Things and smart home.

A dielectric resonator antenna, which includes a dielectric resonator and a substrate on which a planar feeding circuit is configured. The dielectric resonator is located on a first side of the substrate. The planar feeding circuit contains a first feeding part and a second feeding part. The first and second feeding parts are adapted to excite two orthogonal DRA modes in a same frequency band. Due to its polarization diversity, the antenna can be used to replace two commercial Wi-Fi antennas. It can simultaneously be used as a projection device for decoration and advertising.

Omni-directional orthogonally-polarized antenna system for MIMO applications are disclosed herein. An example antenna system comprises two arrays of horizontally polarized radiating elements, and two arrays of vertically polarized radiating elements, each array having roughly 180-degree radiation pattern, disposed about a central axis in a common horizontal plane, arrays of common polarization separated by 180-degrees. Also, the example antenna system includes at least one printed circuit board having a saw tooth pattern, wherein uniform coverage in both vertical and horizontal polarization over 360 degrees is provided using beamforming and polarization diversity.

The invention belongs to the field of optical fiber communication, and particularly discloses a large-port-number matrix optical switch based on a prism group and optical communication equipment. According to the invention, the prism groups are respectively arranged in front of the first LCOS chip and the second LCOS chip, and the prism group in front of the first LCOS chip exerts additional deflection on two beams of mutually parallel linear polarized light after polarization diversity of each port of the optical front end through refraction on an xz plane, so that the deflection angle requirement of the first LCOS chip is reduced; and a prism group in front of the second LCOS chip applies additional deflection to the linearly polarized light reflected by the concave reflector through refraction on an xz plane, so that the linearly polarized light is corrected to be parallel to each other, the additional deflection applied by the prism group is offset, the deflection angle requirement of the second LCOS chip is reduced, the diffraction efficiency is further improved, and the loss of the matrix switch is reduced. Or, under the condition that the diffraction deflection angle of the LCOS chip is fixed, the matrix switch with more ports can be realized through the optical design.

Embodiments herein disclose an antenna system comprising a plurality of panel comprising at least one Multiple Input Multiple Output (MIMO) antenna array, including a plurality of microstrip patch antenna elements and stacked patch antenna elements. The microstrip patch antenna elements, configured in a linear array, facilitate a lower operating frequency, while the stacked patch antenna elements, placed atop the microstrip patch antenna elements, achieve a higher operating frequency. The stacked patch antenna elements are connected in series and oriented at a predefined angle of 90° relative to the microstrip patch antenna elements. A panel from the plurality of panels is arranged at a pre-defined angle of 90° relative to an adjacent panel from the plurality of panels for polarization diversity to obtain the multifunctional shared aperture 8N-port MIMO antenna system.

The invention discloses a pipeline flange connection whole and local bolt loosening positioning method and system, and the method comprises the steps: inputting probe light into an optical fiber, enabling the probe light to generate modulation based on the vibration of a pipeline structure, carrying out the polarization diversity of the modulated reflected light, and carrying out the polarization diversity of the modulated reflected light; demodulating, calculating and analyzing the two paths of light in the cross-polarization state obtained by the polarization diversity to obtain the position information and the optical fiber phase damping ratio of the flange connecting part with the loosened bolts, and searching to obtain the number of the loosened bolts at the flange connecting part according to the corresponding relation between the optical fiber phase damping ratio and the number of the loosened bolts; activating the corresponding multichannel front-end measurement nodes, measuring the impedance of all bolts at the flange joint, and calculating the root-mean-square deviation; and identifying the specific position of the loosened bolt. According to the invention, the flange joint of the pipeline structure with the loose bolts can be accurately positioned, and the number and specific positions of the loose bolts can be accurately obtained.

A method and system for optical switching with integrated polarization diversity control comprising a beam displacer to receive an input beam and split the input beam into a first beam and a second beam with linear polarization. The first and second beams may be received on a liquid crystal cell that may rotate the first or second beam so that both beams have the same polarization after traversing the liquid crystal cell. Based on the polarization, the output beam may be switched to a port.

The application discloses a high-gain millimeter wave polarization reconfigurable antenna and belongs to the technical field of wireless communication.The application provides a high-gain millimeter wave polarization reconfigurable antenna, and the whole antenna structure is completed on two layers of dielectric substrates.Polarization diversity is realized by connecting the center patch of two groups of parasitic short columns by using pin diode switches, and the polarization state can be switched in the directions of ±45 degrees.Then, in order to improve the radiation performance of the antenna, an extended semi-ellipsoid lens is added to the antenna, so that the antenna gain is increased by about 10 dB, and therefore, the integrated lens antenna is an effective method for developing the millimeter wave polarization reconfigurable antenna.The gain-enhanced polarization reconfigurable antenna has the advantages of high gain, low cost and stable radiation pattern and is an ideal choice for low-cost millimeter wave applications of the fifth generation (5G) communication technology.

The application discloses a kind of rock mechanics test in the collection device of acoustic emission signal, including computer, measurement and control and signal processing equipment, distributed acoustic wave sensing equipment and collection probe: the collection probe is composed of single-mode optical fiber and probe skeleton, single-mode optical fiber is fixed around probe skeleton, when testing, collection probe is fixed on the surface of rock sample for testing;The measurement and control and signal processing equipment include: radio frequency amplifier, digital-to-analog conversion module, analog-to-digital conversion module, filter amplifier, field programmable logic gate array and CPU-GPU data processing module;The distributed acoustic sensing equipment includes narrow linewidth laser, fiber coupler, acoustooptic modulator, erbium-doped fiber amplifier, circulator, polarization diversity receiver, first balanced photodetector and second balanced photodetector;Collection signal band is wide, can be conveniently installed on any rock sample.Collecting main frequency is lower, collection probe is connected closely with rock sample, coupling is good, without additional smearing coupling agent.

The invention discloses an electromagnetic sensor array for dual-band direction finding. The electromagnetic sensor array comprises three dual-band electric sensors and three dual-band magnetic sensors, the dual-band electric sensors are used for measuring electric field components in the Z-axis direction and are equally distributed according to the radial distance d and the angular spacing of 120 degrees; the dual-band magnetic sensors are used for measuring magnetic field components in the X-axis direction and the Y-axis direction and are equally distributed according to the radial distance of d / 2 and the angular spacing of 120 degrees. The electromagnetic sensor array for dual-band direction finding disclosed by the invention has the beneficial effects that the electromagnetic sensor array is simple in structure and easy to process and manufacture; measurement of a dual-band electric field and a dual-band magnetic field is achieved, and the dual-band electric field and the dual-band magnetic field can be expanded to multiple bands through The spatial diversity of a scalar array and the polarization diversity of a vector array are fused, and the unambiguous accurate estimation of the direction of arrival of an incident electromagnetic signal is realized in the range of an incident pitch angle of 20-85 degrees and an incident azimuth angle of 0-360 degrees by optimizing the array topology.

The application provides a frequency diversity and polarization diversity transmission system based on diversity antennas, comprising a diversity antenna subsystem, a radio frequency feeding network and a baseband processing unit, the diversity antenna subsystem comprises a first diversity antenna, a second diversity antenna and a metal floor, the first diversity antenna and the second diversity antenna are both at least dual-frequency antennas and are placed in space orthogonally, the radio frequency feeding network comprises a signal phase shifter, an equivalent phase shifter, a power divider and a signal amplifying device, and can realize frequency diversity and twice polarization diversity. The frequency diversity and polarization diversity transmission system based on diversity antennas provided by the application realizes the collaborative innovation of a radio frequency front end and a baseband processing unit, and constructs a complete radio frequency baseband architecture which can simultaneously and actively realize the collaborative processing of polarization diversity and frequency diversity.

A receiver includes an optical front-end and digital circuitry. The optical front-end is configured to receive an optical signal including first and second optical signal components having first and second polarizations and modulated with symbols at a symbol rate. The digital circuitry is configured to derive first and second digital signals representing the first and second optical signal components having the first and second polarizations. The digital circuitry includes a clock detector configured to calculate correlation terms, the correlation terms being calculated in a frequency-domain with a frequency offset commensurate with the symbol rate. The clock detector is configured to recover a clock signal of the symbols by (i) summing selected pairs of the correlation terms, and (ii) calculating or estimating a sum-of-squares of the summed pairs.

This invention relates to a method for measuring the depolarization of a medium in intravascular polarization-sensitive optical coherence tomography (ICP-CT), comprising: setting the polarization state of the input light of a catheter polarization-sensitive optical coherence tomography system; setting the reference light in the H and V channels of the input light and the reference light in the system to have equal intensity; acquiring the electrical signals measured at the polarization diversity point in the form of a Jones matrix to obtain the average measurement Mueller matrix; calculating the standard deviation matrix of the reference region; obtaining the depolarization Mueller matrix of the reference region; extracting the block matrix of the average measurement Mueller matrix of the reference region; calculating the average double attenuation block matrix of the reference region; constructing the average double attenuation matrix of the reference region; obtaining the pseudo-average birefringence phase delay matrix of the reference region; extracting the average depolarization matrix of the reference region from the pseudo-average birefringence phase delay matrix of the reference region using matrix decomposition; obtaining the depolarization Mueller matrix of the target region; and calculating the medium depolarization coefficient.

The application discloses a terahertz electrically controlled polarization diversity dual-band reconfigurable intelligent surface, which comprises a metal bottom plate, a dielectric substrate and a phase shift structure layer arranged layer by layer from bottom to top; the phase shift structure layer comprises phase shift units arranged in an M*N orthogonal array mode, each column of the phase shift units has an anode lead-out wire and a cathode lead-out wire; each phase shift unit comprises three dipoles, and the dipole is in an I-shaped structure and is formed by two T-shaped branches arranged oppositely at vertices. The application works through electric control, thereby realizing dynamic broadband regulation and control of the phase. Without other relatively complex excitation modes such as optical excitation and temperature excitation, the device has great advantages in miniaturization, practicality and production.

A distributed fiber optic sensing system for measuring temperature and strain based on OCDR-SOCF (Optical Detection and Conversion) technology includes a laser, an isolator, a collimator, a polarization controller, a coupler, an acousto-optic modulator (AOM), a polarization diversity photodetector (PDD), and a signal acquisition and processing module. The laser light generated by the laser passes through the isolator and enters a Michelson interferometer. One path of the laser light is calibrated by the collimator and injected into the optical fiber. The returned Rayleigh backscattered light passes through the polarization controller and is then injected into the coupler. The other path of the laser light passes through the acousto-optic modulator and is then injected into the coupler. The two signals enter the polarization diversity photodetector, where they interfere and generate a current signal, which is then output to the signal acquisition and processing module. The signal acquisition and processing module synthesizes the coherence function to achieve simultaneous fiber temperature and strain sensing. This system facilitates measurement, reduces system complexity, and reduces system cost.

The present disclosure is directed toward architectures that combine DWDM and CWDM concepts in a single PIC. Transmitter stages in accordance with the present disclosure include a plurality of multiwavelength lasers having regions of separately grown epitaxial material whose gain peaks are centered at different wavelengths. Each laser launches a wavelength comb comprising a plurality of wavelength signals into a PLC, where the wavelengths within each wavelength comb are separated by a wavelength spacing that is smaller than that between adjacent wavelength combs. In some embodiments, the PLC includes modulator banks for encoding data on the wavelength signals and combining them to produce a composite DWDM output signal. In some embodiments, a receiver stage is included for demultiplexing a composite DWDM input signal and detecting each wavelength channel within it. In some embodiments, the receiver stage employs polarization-diversity techniques to enable it to operate on unpolarized / randomly polarized input signals.

The invention relates to the field of silicon-based optoelectronic integration, and particularly discloses an on-chip adaptive wave combination method and feedback system for a polarization diversity MZM, and the system comprises an optical coupling and mode conversion module, a polarization diversity electro-optical modulation module, an optical power collection and photoelectric conversion module, a signal processing and feedback control module, and a tunable wave combination module. After coupling conversion and modulation, two paths of optical power are collected and subjected to photoelectric conversion, a power difference voltage is obtained through an analog circuit, a bias voltage is superposed to generate a control voltage, and an adjustable combiner is driven to dynamically adjust the beam splitting ratio to complete wave combination. The problems that the output power of the polarization diversity MZM fluctuates randomly along with the polarization state, and an existing polarization control scheme is slow in response, complex in architecture and difficult to integrate with a silicon-based process are solved, real-time accurate compensation of power fluctuation is achieved, it is guaranteed that the combined wave output power is stable, the system architecture is simple, power consumption is low, integration with a silicon-based chip monolithic chip is easy, and the application range is wide. And the performance and the compatibility of the integrated photonic link are improved.

Integrated optical circulators that enable polarization diversity are disclosed. A photonic integrated circulator (200) can be fabricated by including multiple polarization beam splitters (220, 222) and optical polarization rotators (230, 232, 234) such that two copies of an optical signal are output at a receiver in substantially aligned polarization states. The circulator (200) can be used to facilitate bidirectional communication between photonic integrated circuit devices that are inherently polarization sensitive while reducing signal loss.

The utility model provides a polarized antenna, comprising a first antenna substrate on which a horizontal polarized antenna array is arranged; the first edge of the second antenna substrate is connected with the second edge of the first antenna substrate, and a preset angle is formed between the first antenna substrate and the second antenna substrate; and a dual-polarized antenna array is arranged on the second antenna substrate. The polarized antenna is installed on an antenna holding pole beside a track or a building, so that the second antenna substrate is right opposite to the track or the building, a wave beam formed by the dual-polarized antenna array correspondingly covers an area at a small incident angle, and a polarization diversity effect is reserved in an area where vertical polarized waves have good penetrability. The first antenna substrate is correspondingly arranged on the side face of the antenna holding pole, a wave beam formed by the horizontal polarization antenna array corresponds to a coverage area at a large incidence angle, and horizontal polarization has better projectability compared with vertical polarization, so that the problem that a part of energy is wasted due to the fact that vertical polarization components of the antenna are reflected is solved.

A method according to one embodiment of the present disclosure for controlling an optical amplification device (10) of a polarization diversity configuration comprises: detecting a first optical intensity of first polarized waves from a first amplifier (102) which is disposed between a polarization splitter (121) and a polarization combiner (122); detecting a second optical intensity of second polarized waves from a second amplifier (103) which is disposed between the polarization splitter (121) and the polarization combiner (122); detecting a third optical intensity of the first polarized waves from the polarization combiner (122) in a state where the second polarized waves are not input to the polarization combiner (122); detecting a fourth optical intensity of the second polarized waves from the polarization combiner (122) in a state where the first polarized waves are not input to the polarization combiner (122); and acquiring loss of the first polarized waves from the first amplifier (102) to the polarization combiner (122) and loss of the second polarized waves from the second amplifier (103) to the polarization combiner (122) on the basis of the first optical intensity, the second optical intensity, the third optical intensity, and the fourth optical intensity.

The invention provides a four-polarization and wave beam composite reconfigurable antenna array based on 1bit control, which belongs to the technical field of antennas and comprises M * N microstrip patch antenna units in rectangular arrangement and a feed network, the microstrip patch antenna unit independently controls the on-off of a diode through two paths of bias lines, so as to realize 1-bit phase regulation and control of X polarization and Y polarization; the feed network comprises a power divider and a delay line; the delay line is respectively connected with the output end of the power divider and the input end of the microstrip feeder layer of the microstrip patch antenna unit; by adopting the delay lines with different lengths, each microstrip patch antenna unit has different initial phases. According to the invention, periodic phase errors caused by 1bit control are eliminated at low cost, the four-polarization reconfigurable antenna array is constructed, and rapid switching of polarization diversity and wave beam states is realized.

The invention relates to a method and a device for analyzing and measuring crosstalk characteristics of different frequencies of a multi-core optical fiber, and belongs to the technical field of optical fiber communication and measurement. The method comprises the following steps: transmitting an optical signal through a light source, and equally dividing the optical signal into a receiving optical signal and a reference optical signal through a polarization-maintaining coupler; modulating an electric signal with a set frequency to a receiving optical signal, injecting the electric signal into the multi-core optical fiber for transmission, enabling the receiving optical signal to generate inter-core crosstalk (ICXT) in the multi-core optical fiber, and generating an ICXT optical signal; the ICXT optical signal is subjected to interference with the reference optical signal after frequency offset after polarization diversity, and then frequency and power data of the ICXT optical signal are obtained through photoelectric conversion and frequency spectrum measurement. According to the invention, power fluctuation caused by polarization state difference is eliminated through a polarization diversity measurement method; through the measured crosstalk power data under different frequencies, the frequency correlation and distribution characteristics of the ICXT optical signal can be accurately evaluated, and the accuracy and reliability of an analysis result are remarkably improved.