21 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.

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.

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 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 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.

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 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 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.

The application discloses a microwave photon phased array radar detection method and system based on optical domain true delay, and realizes optical domain true delay on different wavelength laser signals through an optical delay module, controls the beam emission angle by combining the wavelength division multiplexing technology and the transmitting / receiving antenna array, modulates the target echo signal to another different wavelength laser signal as a carrier to obtain a receiving optical signal, and again passes through the optical delay module to make different wavelength components reach the coherent receiving module at the same time, realizes coherent fusion with the reference optical signal in the optical domain, and obtains target information through algorithm processing. The application realizes wideband scanning and real-time signal processing of the phased array radar based on the optical domain true delay technology, avoids the problem of beam tilting, has a compact system, low loss, strong anti-interference capability, and can effectively reduce the complexity and manufacturing cost.

The invention provides a light-operated millimeter wave phased array communication system and method, and the system comprises a transmitting end and a receiving end, the transmitting end generates a plurality of single carrier signals and a plurality of OFDM signals which carry transmission information, carries out the frequency division multiplexing of the plurality of carrier signals, obtains a DSCM signal, modulates the DSCM signal into a coupling optical signal, and transmits the coupling optical signal to the receiving end. Transmitting the coupled optical signal based on an optical true time delay network to obtain multiple paths of optical signals with time delay difference, converting the optical signals into multiple directional millimeter wave signals with beam directivity in different user directions, modulating the multiple received millimeter wave signals into multiple optical carrier signals by a receiving end, and transmitting the multiple optical carrier signals to the receiving end; and demodulating the plurality of optical carrier signals into a plurality of digital carrier signals, and extracting transmission information carried by each of the plurality of digital carrier signals. According to the system, accurate time delay compensation can be applied to different frequency components through the optical true time delay network, so that beam focusing in different user directions is realized, and the multi-user communication quality is improved.

The application relates to a high-power tunable optical true delay phased array emission system based on a light guide device, which comprises a signal generator, a narrow-band semiconductor laser, an arbitrary waveform generator, a first electro-optical modulator, a second electro-optical modulator, an optical isolator, a laser amplification module, a multi-channel optical splitter, an optical path adjustment module, a spatial light delay module, an optical coupling module, a light guide semiconductor module and an antenna array module; the application is based on a single light guide device to perform array power synthesis, constructs a high-power tunable optical true delay phased array emission system, and improves the delay precision and speed of the system; multi-channel high-power pulse laser is input into equal numbers of light guide devices to realize photoelectric conversion and radio frequency power amplification; the amplified electric signal is input into equal numbers of phased array elements to realize spatial radiation and power synthesis of a single source power of hundreds of kilowatts; the application has the characteristics of super wideband, low loss, strong anti-radiation interference ability, flexible adjustment of multiple parameters, wide bandwidth and wide angle scanning.

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.

An integrated circuit includes a programmable reflective load line that includes main delay segments arranged in series between an input of the programmable reflective load line and ground, variable delay modules arranged in parallel between nodes adjoining the main delay segments and ground, and main switches, with each main switch arranged between one of the variable delay modules and one of the nodes adjoining the main delay segments. Each variable delay module includes sub-delay segments arranged in series between the associated main switch and ground. Each variable delay module also includes one or more sub-delay switches, with each sub-delay switch arranged between a node adjoining two of the associated sub-delay segments and ground. The integrated circuit may further include a hybrid coupler arranged with the programmable reflective load line and another programmable reflective load line as a reflective-type phase-shifter.