10results about "Line impedence variation compensation" patented technology

The invention discloses a millimeter wave waveguide transmission loss compensation method, which relates to the technical field of millimeter wave waveguide transmission and comprises the following steps of: monitoring multi-dimensional transmission loss in real time: acquiring electrical parameters such as signal amplitude and phase and parameters such as temperature, humidity and structural deformation to ensure data time synchronization; a loss mechanism layering analysis step: distinguishing three types of loss proportions, and determining dominant factors; a self-adaptive compensation strategy matching step: selecting an exclusive or cooperative compensation mode according to the loss type; a dynamic compensation parameter optimization step: adapting a signal frequency to adjust device parameters; a real-time feedback and fine tuning step: comparing signal quality dynamic correction parameters; and a closed-loop iterative optimization step: constructing a mapping model for iterative updating to form a whole-process closed loop. According to the invention, accurate and efficient compensation of millimeter wave waveguide transmission loss is realized, and signal transmission stability and environment adaptability are improved; the system has quick response and long-term operation reliability, and provides support for large-scale application of the millimeter wave technology.

The invention relates to the technical field of wireless communication, and provides a differential matching structure which comprises a first metal layer, a second metal layer, a third metal layer and a capacitor, a first coupling coil is integrated on the second metal layer, a second coupling coil and a third coupling coil are respectively integrated on the first metal layer, and the second coupling coil and the third coupling coil are positioned on the same side of the first metal layer; the third metal layer is used for grounding; the first end of the first coupling coil is used for accessing a radio frequency signal, the second end of the first coupling coil is grounded after being connected with a capacitor in series, the first end of the second coupling coil and the first end of the third coupling coil are connected and jointly connected to the third metal layer, and the second end of the second coupling coil is used for outputting the radio frequency signal; the second end of the third coupling coil is used for outputting a radio frequency signal; the first coupling coil is coupled with the second coupling coil and the third coupling coil. According to the invention, the return loss is small, and the broadband matching effect is good.

The invention discloses an underwater acoustic communication Doppler compensation method based on kinematics constraint and time-varying resampling, and belongs to the technical field of underwater acoustic communication. The method comprises the following steps: firstly, performing discrete Doppler rough estimation on a received signal; denoising, kinematics constraint abnormal value correction and smoothing processing are carried out on the sequence through cascade filtering; then, a continuous speed curve is constructed by utilizing partition mixed interpolation, and oscillation is suppressed by adopting nearest neighbor interpolation in an edge region; and finally, performing iterative judgment based on the residual index, and establishing a nonlinear mapping relation through full-time-domain integration to perform time-varying resampling on the signal. According to the method, the problem of synchronization failure caused by correlation peak divergence and interpolation boundary oscillation under non-uniform motion is solved, sampling point level waveform recovery under a high dynamic scene is realized, and the robustness and synchronization stability of the system are improved. The method is suitable for the communication field of an underwater mobile platform represented by an unmanned underwater vehicle and a subsurface buoy in a complex marine environment.

This invention discloses a dynamic adaptive adjustment method, apparatus, device, and medium for terminating resistance, belonging to the field of industrial fieldbus communication technology. The method includes: determining whether the current node is a physical end of the bus; if not, disconnecting the terminating match; if it is, injecting a calibration pulse with a preset rising edge into the bus; acquiring the reflected signal generated by the calibration pulse on the bus, and recording waveform characteristic parameters including at least overshoot amplitude and ringing duration; iteratively adjusting the terminating resistance value using a variable step-size strategy based on the waveform characteristic parameters; increasing the resistance value when the overshoot amplitude exceeds a preset amplitude threshold, and decreasing the resistance value when the ringing duration exceeds a preset time threshold, until the matching completion condition is met; and locking the optimal terminating resistance configuration to the matching resistance value in the current communication mode. This invention achieves automatic identification of end nodes and closed-loop adaptive adjustment of the terminating resistance, significantly improving the signal integrity and reliability of bus communication.

A system for filter enhancement, preferably including one or more analog taps and a controller, and optionally including one or more couplers. The system is preferably configured to integrate with a filter, such as a passband filter or other frequency-based filter. The system can be configured to integrate with an RF communication system, an RF front end, or any other suitable RF circuitry. A method for filter enhancement, preferably including configuring one or more analog taps, and optionally including calibrating a system for filter enhancement and / or receiving temperature information.

The application discloses a kind of millimeter wave waveguide transmission loss compensation methods, it is related to millimeter wave waveguide transmission technical field, including multidimensional transmission loss real-time monitoring step, collection signal amplitude, phase and other electrical parameters and temperature, humidity, structural deformation and other parameters, ensure data time synchronization;Loss mechanism hierarchical analysis step, distinguish three kinds of loss proportion, clear dominant factor;Self-adapting compensation strategy matching step, according to loss type select exclusive or collaborative compensation mode;Dynamic compensation parameter optimization step, adapt signal frequency adjustment device parameter;Real-time feedback and fine adjustment step, compare signal quality dynamic correction parameter;Closed-loop iterative optimization step, construct mapping model iterative update, form whole-process closed loop.The application realizes the accurate and efficient compensation of millimeter wave waveguide transmission loss, improves signal transmission stability and environmental adaptability;With fast response and long-term operation reliability, provide support for millimeter wave technology scale application.

The invention provides an on-line diagnosis method, device and equipment for an automobile audio bus and a medium, the method is applied to a host, and the method comprises the following steps: generating a digital chaotic sequence different from a transmission signal in the automobile audio bus; injecting a digital chaos sequence into the bus to send the digital chaos sequence to a target child node in an idle time slot when the bus periodically transmits the transmission signal; receiving a response signal returned by the analog switch through the automobile audio bus; taking the response signal as a target chaotic sequence, and performing comparative analysis on the target chaotic sequence and the digital chaotic sequence; and determining whether the impedance mismatching problem exists on the communication path from the host to the child node and the analog switch based on the comparison analysis result. By means of the method, the technical problem that in the prior art, on the premise that normal communication of the bus is not interrupted, real-time, intelligent and automatic diagnosis and positioning cannot be conducted on the bus impedance state can be solved.

This invention relates to the field of wireless communication technology and provides a differential matching structure. The differential matching structure includes a first metal layer, a second metal layer, and a third metal layer stacked sequentially and insulated from each other, as well as a capacitor. A first coupling coil is integrated on the second metal layer, and a second coupling coil and a third coupling coil are integrated on the first metal layer, located on the same side of the first metal layer. The third metal layer is used for grounding. A first end of the first coupling coil is used to receive a radio frequency (RF) signal, and a second end of the first coupling coil is connected to ground via a capacitor connected in series. The first ends of the second and third coupling coils are connected and jointly connected to the third metal layer. The second ends of the second and third coupling coils are used to output RF signals. The first coupling coil is coupled to both the second and third coupling coils. This invention results in low return loss and good wideband matching performance.

The application provides a continuous time linear equalizer and a high-speed serial communication receiver thereof, and belongs to the technical field of integrated circuits, and comprises: a plurality of differential input pairs with different input common-mode voltage ranges; an input selection circuit configured to alternatively enable one of all the differential input pairs as a target differential input pair; a differential load circuit coupled to an output end of a differential input stage module and having an adjustable equivalent impedance; and a load control circuit configured to determine load configuration information in response to an input mode selection signal and adjust the equivalent impedance of the differential load circuit according to the load configuration information. The application establishes a linkage mechanism of input stage switching and load impedance adjustment through the input mode selection signal, automatically calls corresponding calibration parameters to eliminate the offset voltage in different modes while expanding the input common-mode voltage range, and significantly improves the adaptability and signal transmission quality of the high-speed interface circuit.

The present application relates to the technical field of microwave circuit, especially to a compact L-band multi-path superconducting filter receiving front-end component, which is composed of a low-pass filter, a limiter, a first radio frequency switch, a straight-through radio frequency cable, a superconducting band-pass filter group, a second radio frequency switch, a low-noise amplification circuit and a digital control attenuator, and forms the compact L-band multi-path superconducting filter receiving front-end component through the connection relationship among them, realizes the combination of normal-temperature devices and superconducting filter components, improves the power capacity of the filter, and ensures the normal work of the receiving link under the failure condition of low-temperature environment.