43 results about "True time delay" patented technology

An adaptive modular multimodal communication and computing panel includes a multilayer stack with a protective layer transmissive in selected bands, a reconfigurable communication layer operable in phased array, reflectarray, hybrid phased reflector, free space optical, or quantum modes, and electronics with heterogeneous processors. A multi scale interconnect and input and output fabric couples electrical, radio frequency, guided optical, and free space optical domains through interfaces including electro optic transduction and RF or baseband conversion. The fabric may implement programmable true time delay, resonators, and comb referenced timing. A management system coordinates beamforming, sensing, routing, calibration, workload placement, and security. Panels tessellate and connect by electrical, radio frequency, and fiber optic interfaces, supporting hot swappable modules, blind mate connectors, robotic servicing, and anti tamper features. Power and thermal subsystems harvest, store, regulate, and dissipate energy. The architecture scales from chip level modules to vehicle, airborne, maritime, orbital, and deployable systems.

The invention discloses a broadband and high-efficiency true time delay reflective array antenna, and belongs to the technical field of antenna engineering. Through the design of the broadband horn feed antenna, the broadband butterfly-shaped dipole antenna and the real-time-delay coaxial transmission line, high-efficiency directional radiation is realized. The gain bandwidth of the multi-layer patch type reflective array antenna is much larger than that of a traditional multi-layer patch type reflective array antenna; compared with a traditional transmission line phase modulation type reflective array antenna, due to stable time delay and shielding and no resonant structure, the antenna has better gain stability, and an in-band gain curve is increased approximately linearly. Finally, the antenna is simple in structure and can be realized only by a single-layer patch structure and a common coaxial transmission cable, and high-cost laminated patch processing is not needed.

An apparatus may include antenna elements arranged in tiles. The apparatus may include analog beamforming elements coupled with the plurality of antenna elements and analog to digital converters (ADCs) coupled with the analog beamforming elements. The apparatus may include digital signal processing (DSP) layers, where a first DSP layer includes first combining cells for combining signals from the ADCs and a second layer includes combining cells for combining signals from the first combining cells. The combining cells may be configurable for linearly weighting signals input to the combining cells or applying a true time delay function to the signals input to the combining cells. The apparatus may include a signal processing manager coupled with the plurality of DSP layers that determines one or more of the plurality of DSP layers to implement the true time delay based on one or more characteristics of the radio frequency beam.

The invention relates to the technical field of wireless communication, in particular to an angle-distance joint positioning method in a near-field communication system assisted by wave beam squint, which comprises the following steps of: determining a starting point (theta s, rs) and an end point (theta e, re) of a near-field sensing area, and determining a distance-to-angle joint in the near-field sensing area by adjusting parameters of a true time delayer and a phase shifter. Generating a beam squint focusing scanning track for joint angle-distance positioning; the method comprises the following steps: a base station sends a pilot signal, receives an echo signal of a user side on each subcarrier, and reversely deduces an initial angle estimation value and an initial distance estimation value of a target user by calculating receiving power and searching a subcarrier index corresponding to a power peak value; and a local search area is selected near the initial estimation value obtained in the coarse positioning step, angle and distance two-dimensional joint search is carried out based on an improved near-field multiple signal classification algorithm, and a high-precision final angle estimation value and a high-precision final distance estimation value are output.

The invention discloses a beam focusing method and system based on a liquid neural network and meta learning, and belongs to the technical field of wireless communication, and the method comprises the following steps: determining a system model; determining an optimization target; and joint optimization. The LNNM-BF algorithm with high robustness and unsupervised learning is provided, the LNNM-BF algorithm designs a phase shift matrix theta through an index matrix S and a phase compensation matrix phi, then an analog precoding matrix FPS and a digital precoding matrix FBB are designed at a BS end, and the near-field dual-beam splitting effect can be well relieved without introducing an extra true time delayer. Besides, the LNNM-BF algorithm enhances the adaptability of beam focusing to imperfect CSI through a meta-learning framework and improves the robustness of the algorithm, and the embedded LNN dynamically adjusts the topological structure and the connection weight between neurons through the currently input and previously implied iteration information to realize the maximization of SE.

The application relates to the technical field of wireless communication, in particular to a beam squint auxiliary angle-distance joint positioning method in a near field communication system, which comprises the following steps: determining the starting point (theta s ,r s ) and the ending point (theta e ,r e ) of the near field sensing area, generating a beam squint focusing scanning track for joint angle-distance positioning by adjusting the parameters of the true time delay device and the phase shifter; a base station sends a pilot signal, receives echo signals of a user terminal on each subcarrier, calculates the received power, finds the subcarrier index corresponding to the power peak value, and reversely deduces the initial angle estimation value and the initial distance estimation value of the target user; a local search area is selected near the initial estimation value obtained in the coarse positioning step, a two-dimensional joint search of the angle and the distance is carried out based on an improved near field multiple signal classification algorithm, and a high-precision final angle estimation value and a final distance estimation value are output.

The invention discloses a quasi-true time delay broadband beam forming network with Chebyshev amplitude distribution. The quasi-true time delay broadband beam forming network comprises a 3 * 4 beam forming network, a 4 * 4 true time delay network, an input port, an output port and the like. The 3 * 4 beam forming network comprises first to tenth parallel double-line couplers, first to seventh open-short circuit stub loading transmission lines and first to fourth 50-ohm transmission lines; the 4 * 4 real time delay network comprises first to eleventh real time delay circuits and first to fourth connecting lines. Broadband Chebyshev amplitude output is obtained by setting different coupling coefficients of the first to tenth parallel double-line couplers. In-band flat phase difference output is obtained by setting phase shift values of the first to fourth 50-ohm transmission lines, phase shift values of the first to seventh open-short circuit stub loading transmission lines and impedance values and electrical lengths of the open-short circuit stubs; through controlling the first to eleventh true time delay circuits, the phase slope between the output ports has a frequency-dependent characteristic, and after the antenna is connected, a consistent beam direction in a broadband range is obtained.

The invention discloses a real-time-delay-based programmable metasurface array antenna, which comprises a metasurface antenna array and a real-time-delay feed network, and is characterized in that the metasurface antenna array comprises 8 * 8 metasurface antenna units formed by first dielectric layers, metal plate layers and second dielectric layers, the first dielectric layers are integrated with 7 metal patches, a first diode and a second diode, and the second dielectric layers are integrated with 7 metal patches; the on-off state of the diodes is controlled through the direct current bias circuit, and 0-degree, 90-degree, 180-degree and 270-degree four-state phase regulation and control are achieved. The second dielectric layer comprises five metal patches which are matched with the through holes and the copper columns to realize upper and lower layer electric connection; the real time delay feed network adopts a 1: 8 * 8 power divider feed network, feeds by attaching a metal patch, and provides initial time delay related to the position for each unit. The method solves the problems of discrete phase quantization and frequency dispersion of a traditional array, is suitable for 5G / 6G broadband communication, dynamic beam tracking and other scenes, and remarkably improves the beam scanning precision and reliability.

The present application belongs to the technical field of near-field wideband wireless communication, and particularly relates to a near-field analog frequency division multiplexing method based on beam oblique view extension. The method of the present application firstly models the signal model and the channel model of the near-field wideband multi-user OFDMA system, calculates the signal-to-noise ratio and the achievable rate of different users on each subcarrier, and maximizes the minimum achievable rate in all users under the single radio frequency chain hardware constraint by jointly optimizing the subcarrier allocation, the phase shifter phase, the true time delay parameter and the power allocation. The present application can utilize the parallel true time delay structure to generate frequency-dependent beam focusing, so that different subcarriers are focused to different near-field user positions, thereby overcoming the problems of beam focusing difficulty and user fairness deficiency in the single radio frequency chain near-field wideband multi-user system. The simulation results show that the proposed method can significantly improve the minimum user rate of the system, and the performance is better than that of other benchmark methods.

Disclosed is a low Earth orbit satellite communication method and system using frequency-dependent beamforming. The low earth orbit satellite communication method using frequency-dependent beamforming includes: (a) forming frequency-dependent beamforming by adjusting at least one of a true time delay (TTD) and a phase shifter; and (b) searching a satellite or simultaneously providing a data service to multiple users by using the frequency-dependent beamforming, wherein the true time delay (TTD) is mandatory, while the phase shifter (PS) can be used optionally.

A true time-delay circuit based on a slow-wave transmission line comprises a reflective main time-delay unit comprising a switchable slow-wave transmission line and two switch type true time-delay units arranged at the input end and the output end of the reflective main time-delay unit respectively. Wherein the reflective main delay unit comprises a quadrature coupler and reflective loads which are respectively arranged at two ends of the quadrature coupler and are grounded, the quadrature coupler divides an input signal into two paths of quadrature signals, and the two reflective loads respectively reflect the quadrature signals back to the quadrature coupler and then output the quadrature signals. According to the invention, the delay efficiency of the unit area of the true delay circuit can be obviously improved, the wave beam squint is effectively reduced, and the bandwidth is improved.

This invention discloses a satellite system suitable for multi-satellite cooperative MIMO applications, relating to the field of satellite communication technology. The system includes a decentralized constellation of multiple satellites and multiple user terminals. Each satellite in the decentralized constellation has independent signal processing capabilities. Each satellite includes a satellite-to-ground communication front-end, a signal processing unit, and an inter-satellite link terminal. The satellite-to-ground communication front-end is used for transmitting and receiving radio frequency signals with the user terminals. The signal processing unit is used for performing baseband signal processing and cooperative algorithm calculations. The inter-satellite link terminal is used to establish inter-satellite links to achieve data interaction with other satellites. The satellite platform provides attitude control, power supply, and spatiotemporal reference for the communication payload. This invention can eliminate the risk of single-point failure, improve system reliability and scalability, overcome transmission bottlenecks through inter-satellite laser links, and achieve broadband dispersion-free transmission using optical true time-delay technology, reducing satellite-to-ground round-trip latency.

The present invention provides a 100-picosecond true-delay MEMS fiber delay line and its array. The 100-picosecond true-delay MEMS fiber delay line is optically collimated by coupling a long-stroke MEMS vertical motion micromirror with a multi-reflection fiber collimator. By setting a motion amplification lever structure, the out-of-plane motion stroke of the long-stroke MEMS vertical motion micromirror can reach the millimeter level, and the vertical movement accuracy can reach the nanometer level, thus breaking through the limitation of the existing technology that the MEMS vertical motion micromirror has a stroke of only tens of microns and reducing the preparation cost. In addition, the present invention greatly improves the delay amount of the fiber delay line, makes the fiber delay line highly precise and rapidly tunable, and realizes the arraying of the fiber delay line to a certain extent, thereby meeting the application requirements of high-end optical systems such as optical phased arrays.

The application provides a high-efficiency communication and perception integrated method and assembly based on beam offset, which is applied to a MIMO-OFDM base station, wherein a true time delay line unit is arranged between each phase shifter and antenna unit of the MIMO-OFDM base station, and the phase of the phase shifter and the time delay value of the true time delay line unit are set based on the required perception space of the base station, so that all subcarrier beams emitted by the base station can cover the perception space in a predetermined beam offset mode, the angle estimation value of the target is determined according to the frequency of the peak power subcarrier in the echo signal, the distance estimation value of the target is determined according to the phase difference of the sidelobe power subcarrier, and finally the position of the target is determined according to the angle estimation value and the distance estimation value; the base station only needs to emit and receive signals once, so that full-coverage wave sweeping target perception of the beam offset space can be realized, the accuracy of target positioning is ensured, and the time cost is reduced.

The invention provides an integrated optical beam forming chip based on a thin film lithium niobate platform on an insulator. The integrated optical beam forming chip can be applied to the technical field of microwave photonics. The chip comprises a light input port, a light modulation unit, a light beam splitting unit, N parallel light interference channels and a light output port which are integrated on a thin film lithium niobate substrate on the same insulator. Each light interference channel comprises a light delay unit and a light phase shift unit which are connected in series, and the light delay unit and the light phase shift unit are tuned based on the linear electro-optical effect of a thin film lithium niobate substrate on an insulator. The optical delay unit adopts a binary cascade architecture and consists of M + 1-level high-speed optical switches and M groups of reference arms and optical delay arms with asymmetric lengths; the high-speed optical switch comprises a sunken traveling wave modulation electrode with a push-pull structure, and is used for realizing nanosecond optical path high-speed routing and binary programmable optical true time delay under the control of a digital level signal. An electromagnetic isolation structure is arranged between every two adjacent light interference channels and used for shielding high-speed driving signal crosstalk.

The invention discloses a series-parallel mixed true time delay architecture and beam forming method for a near-field uniform circular antenna array, and the method comprises the steps: 1, building a spherical coordinate model of the uniform circular antenna array in a near-field downlink broadband transmission scene, and determining a channel expression from each unit of the antenna array to a user; 2, initializing a phase shift matrix of the phase shifter and a time delay value under the condition that a real time delay unit is parallel, and obtaining an optimal initial unit index under an ideal circuit; and step 3, according to the serial-parallel mixed true time delay architecture provided by the invention, determining a serial starting unit, initializing a serial true time delay unit and compensating time delay values of the true time delay unit. And 4, carrying out iterative optimization on the phase shift matrix, the time delay value of the true time delay unit and the compensation time delay value by adopting an alternating optimization algorithm. According to the invention, the maximum time delay demand of the real time delay unit can be reduced, so that the whole architecture can still obtain ideal beam focusing and signal transmission effects under the condition that the real time delay unit is limited.

The present application belongs to the technical field of adaptive control of thermoacoustic oscillation system, and discloses an adaptive control method for a thermoacoustic oscillation system with unknown input time delay. Through an adaptive backstepping control method, the exponential stability of a Rijke tube system can be ensured even in the case that the actuator time delay is unknown and time-varying, and the system instability problem caused by the fact that the existing control method does not consider the time delay or the time delay is unknown is solved. Full-state feedback control can be realized by measuring only part of the boundary information such as the sound pressure at the upper end of the tube and the sound velocity at the lower end, the sensor configuration cost and the system complexity are reduced, and the method is more suitable for engineering practice. Through adaptive time delay estimation and projection operator mechanism, the controller has good robustness to time delay variation and model uncertainty, and can quickly converge to the true time delay under different initial estimation values without affecting the system stability. The present application provides a new way for the stable control of an aero-engine combustion system.

The invention belongs to the technical field of self-adaptive control of a thermoacoustic oscillation system, and discloses a self-adaptive control method of a thermoacoustic oscillation system with unknown input time delay. Through the self-adaptive backstepping control method, the index stability of the Rijke management system can still be ensured even under the condition that the time delay of an actuator is unknown and varies, and the problem of system instability caused by the fact that an existing control method does not consider the time delay or the time delay is unknown is solved; full-state feedback control can be achieved only by measuring part of boundary information such as the upper end sound pressure and the lower end sound velocity of the pipe, the sensor configuration cost and the system complexity are reduced, and the method is more suitable for engineering practice; through adaptive time delay estimation and a projection operator mechanism, a controller has good robustness for time delay change and model uncertainty, real time delay can be quickly converged under different initial estimation values, and the system stability is not affected; and a new way is provided for stable control of an aero-engine combustion system.

An integrated circuit may include a phase shifting / partial beamforming network circuit and a plurality of true time delay (TTD) circuits. The beamforming circuit may include a plurality of receive inputs. Each receive input may be coupled to one of a plurality of antenna elements. The beamforming circuit may include a plurality of receive / transmit connectors, each of which may correspond to a beam of a plurality of beams. The beamforming circuit may include a plurality of transmit outputs each of which may be coupled to one of the plurality of antenna elements. Each TTD circuit may include a first connection coupled to one of the receive / transmit connector outputs and a second connection coupled to one of a plurality of serial lines. Each TTD circuit may be configured to apply one or more of an integer delay or a fractional delay to data received from the receive / transmit connector or the serial line.

This invention discloses a broadband transmission array antenna incorporating a true time-delay phase transmission line (TDPR), comprising a tunable phase magnetoelectric dipole transmission array and a horn feed. The tunable phase magnetoelectric dipole transmission array includes several periodically arranged antenna elements, each antenna element comprising a true time-delay phase transmission line layer. The transmission phase of each antenna element is determined by the transmission phase of the true time-delay phase transmission line. This invention utilizes the transmission characteristics of the true time-delay phase transmission line, changing its length to alter its transmission phase, and ultimately changing the transmission phase of the magnetoelectric dipole transmission array element. Simulation results demonstrate that the antenna proposed in this invention can achieve high gain and wide bandwidth.

The invention particularly relates to a light-operated true delay network and method based on wavelength-time interleaving switching, and the network comprises a multi-wavelength signal generation module which is used for generating multiple paths of optical signals with different wavelengths, and modulating the optical signals into multi-wavelength optical signals to be subjected to delay regulation; the wavelength-time interleaving optical true delay line module is used for carrying out multi-wavelength signal switching on the multi-wavelength optical signal to be subjected to delay regulation and control according to a preset wavelength-time interleaving sequence based on the received control signal to generate a plurality of single-wavelength signals after true delay regulation and control, a true delay regulation and control signal with a target delay amount is output from the plurality of single-wavelength signals in a routing manner based on the control signal; and the photoelectric conversion module is used for converting the target true delay signal into a radio frequency signal and outputting the radio frequency signal. Therefore, the problem that communication signals are damaged due to the fact that the switching speed of the true delay amount of the optical signals is low in the prior art is solved, and high-frequency broadband true delay regulation and control which are fast in switching, low in loss and resistant to electromagnetic interference are achieved.

The invention provides a differential true delay line circuit and a microwave communication system. The differential true delay line circuit comprises a first total differential port, a second total differential port and a differential true delay line unit connected between the first total differential port and the second total differential port. The differential true delay line unit comprises N delay circuits, and N is a positive integer; each time delay circuit comprises a first coupling line pair and a second coupling line pair; in the same time delay circuit, the second differential port of the second coupling line pair of the Nth time delay circuit is connected with the second total differential port; the first differential port of the first coupling line pair of the ith time delay circuit is connected with the second differential port of the second coupling line pair of the (i-1) th time delay circuit; the second differential port of the second coupling line pair of the ith time delay circuit is connected with the first differential port of the first coupling line pair of the (i + 1) th time delay circuit; i is a positive integer and 1 < i < N.

The invention discloses a near-field terahertz broadband system user positioning method, which relates to the technical field of wireless communication physical layers, and comprises the following steps: 1) a base station generates a beam forming vector based on far-field beam splitting by adjusting parameters of a phase shifter and a true delayer; 2) the base station scans a sensing area by using a beam forming vector based on far-field beam splitting, and a user feeds back a receiving signal on each subcarrier; 3) the base station inputs a received signal into the CNN user position estimation model to obtain angle and distance estimation of a user, and determines an area where the user is located; and 4) the base station designs values of a phase shifter and a true delayer, controllable near-field beam splitting is realized, and accurate positioning of the user is realized in the area determined in the previous step. According to the method, the beam splitting phenomenon in the near-field broadband terahertz system is fully utilized, so that the time overhead of user positioning is reduced, and the time overhead required by high-precision positioning is reduced.

The application discloses a true time delay line based on a misaligned symmetric artificial surface plasmon structure and belongs to the field of novel microwave devices, comprising a metal ground, a dielectric substrate arranged above and below the metal ground, a true time delay line structure arranged on the dielectric substrate above the metal ground, the true time delay line structure comprising an artificial surface plasmon waveguide periodically arranged by a plurality of misaligned symmetric artificial surface plasmon unit structures loaded with varactor diodes, a microstrip line for feeding the artificial surface plasmon waveguide, and a varactor diode bias circuit composed of a metal patch and the microstrip line. The true time delay line based on the misaligned symmetric artificial surface plasmon structure has the characteristics of approximately constant time delay value in a wideband range, real-time regulation of the time delay value through the varactor diode, low insertion loss and easy processing, and has a wide application prospect in a wideband phased array system.

The embodiment of the invention provides an ROF communication method and system based on optical true delay, and belongs to the technical field of communication, and the method comprises the steps that a transmitting end generates an optical carrier signal carrying IQ modulation information from a multiplexing signal through an RoF system, and the optical carrier signal is coupled with an optical carrier for heterodyne beat frequency to generate a coupled optical signal; different time delays are applied to each channel through an optical true time delay network to generate multiple paths of time delay regulation and control optical signals, and the optical signals are subjected to photoelectric conversion to form radio signals with beam directivity; and the receiving end down-converts the received signal into an intermediate-frequency signal, and re-modulates the intermediate-frequency signal to an optical carrier for long-distance transmission through an optical fiber. According to the embodiment of the invention, through combination of optical domain beam forming and optical fiber transmission, directional transmission and ultra-long-distance reliable relay of multi-user signals are realized, and the spectrum efficiency and the anti-interference capability of the system are effectively improved.

The invention discloses a beam focusing method and system based on a liquid neural network and meta learning, and belongs to the technical field of wireless communication, and the method comprises the following steps: determining a system model; determining an optimization target; and joint optimization. According to the invention, the LNNM-BF algorithm with strong robustness and unsupervised learning is provided, the LNNM-BF algorithm designs a phase shift matrix through an index matrix and a phase compensation matrix, then an analog precoding matrix and a digital precoding matrix are designed at a BS end, and the problem of a near-field dual-beam splitting effect can be well relieved without introducing an extra true time delayer. Besides, the LNNM-BF algorithm enhances the adaptability of beam focusing to imperfect CSI through a meta-learning framework and improves the robustness of the algorithm, and the embedded LNN dynamically adjusts the topological structure and the connection weight between neurons through the currently input and previously implied iteration information to realize the maximization of SE.

Systems and methods for beam forming are provided. The system includes an optical beam forming network (OBFN), one or more optical to radio frequency conversion units, and an analog beamforming network (ABFN). The OBFN forms a beam in the optical domain and includes an optical delay module for providing a true time delay in the optical domain to an optical signal received by the OBFN to introduce a coarse delayed optical signal. The optical to radio frequency (RF) conversion units convert the coarse delayed optical signal from the optical domain to the RF domain to obtain a coarse delayed RF signal. The ABFN forms a plurality of phase-shifted signals and provides the phase-shifted signals to corresponding array elements of an array system. The ABFN includes an analog delay module configured to provide at least one fine phase shift to the coarse delayed analog signal to obtain the delayed signals.

The present invention discloses an adaptive true time delay alignment device for analog quantization, belonging to the field of communication technology. The device includes a signal input module, a delay module, a first peak detection module, a second peak detection module, a first amplitude normalization module, a second amplitude normalization module, a multi-channel comparator module, a time delay quantization module, a filtering module, a logic decision numerical control module, and a power amplifier module. The present invention takes the peak detection module, the multi-channel comparator module, and the logic decision numerical control module as the core, statistically analyzes and judges the comparison signals through digital gate circuits, and after false signal determination, feeds back to the time delay module to achieve time delay alignment, laying a foundation for subsequent circuits to perform signal processing. Compared with digital time delay alignment, the present invention has a simple structure, low complexity, and has an adaptive ability, and can be applied to time delay alignment of various signals and distorted signals, including but not limited to circuit time delay alignment of radio frequency power amplifiers, antenna arrays, and radar signals.

A scanning true time delay antenna includes a first layer including at least one first corporate feed having a first port and a plurality of second ports communicatively coupled to the first port, and a second layer disposed over the first layer and rotatable relative to the first layer. The second layer includes a plurality of second corporate feeds each having a third port and a plurality of fourth ports communicatively coupled to the respective third port, and a plurality of radiators, wherein each of the plurality of radiators is communicatively coupled to a respective one of the plurality of fourth ports. A plurality of first variable time delay lines are arranged at least partially in at least one of the first layer or the second layer, wherein each of the plurality of second ports is communicatively coupled to a respective one of the plurality of first variable time delay lines, and each third port is communicatively coupled to a respective one of the plurality of first variable time delay lines. Rotation of the second layer relative to the first layer creates a linear progressive length change from the first port to each of the radiators.

The application discloses a time delay compensation method of a terahertz optical fiber communication system and belongs to the technical field of access communication. The application introduces an optical true time delay compensation network between digital precoding and analog precoding of a hybrid precoding structure. Uniform optical carriers generated by an optical comb wave generator are used for wavelength mapping, and then the properties of a dispersion medium are used to generate different time delays for different wavelengths to form a beam compensation mode. By introducing an optimal beam compensation mode in a radio frequency chain, the beams are aligned with the target direction at all frequencies, and the beam splitting effect is solved. By using passive wavelength multiplexers and wavelength demultiplexers, the application greatly reduces power consumption and deployment complexity. The beam compensation mode provided by the optical true time delay compensation network changes the signal time delay, and the time delay compensation can realize different phases for different frequencies to compensate the beam splitting effect. Different precision compensation can be provided according to actual deployment needs to match different application scenarios.