12results about How to "High synchronization accuracy" patented technology

This application relates to an interrupt generation device with synchronization function. By using one of the interrupt generation modules as a reference interrupt module, when the synchronization signal output by the synchronization output module arrives, the reference timing module adjusts the count of each interrupt module according to the synchronization signal, the reference count of the reference interrupt module, and the timing duration of the reference timing module itself, so as to change the output time of each subsequent interrupt signal. This makes the output reference interrupt signal synchronized with the synchronization signal, and other interrupt signals still maintain the initial phase relationship with the reference interrupt signal before adjustment, and eventually synchronize with the synchronization signal. In this way, only one synchronization signal is needed to ensure that the synchronization of all interrupt signals is achieved without changing the phase relationship between the interrupt signals of each interrupt generation module. The method is simple and has high synchronization accuracy.

The application relates to a kind of moving base star sensor and high-precision time synchronization method of inertial navigation, and is mainly related to the technical field of integrated navigation, and the main steps include: real-time acquisition of the motion parameter data output by IMU;Using second-order extrapolation algorithm, based on IMU historical data, the equivalent IMU data corresponding to the star sensor data update time is calculated, the output frequency difference is adapted;Through asynchronous Kalman filtering algorithm, combined with IMU data and star sensor measured data, time update and measurement update are completed, and dynamic error is inhibited;Using high-precision crystal oscillator to optimize the clock source of inertial navigation system, the inherent error of clock output is reduced;Through multi-link cooperation, the time delay error of star sensor is compensated;Using FPGA interrupt latch, time alignment at the hardware level of star and inertial is realized.The method can effectively solve the time asynchronous problem of star sensor and inertial navigation data in the online calibration stage during flight, and guarantee the navigation accuracy and stability of integrated navigation system.

The application belongs to the technical field of wireless positioning and specifically relates to a reconfigurable intelligent surface assisted SISO system user near field positioning method. Regular multivariate decomposition and orthogonal matching pursuit are combined to obtain initial values of TOA and AOD on the RIS, then, a l1-norm regularization method based on sparsity is used to estimate the distance. Then, the maximum likelihood estimation formula is used to refine the initial estimation. Finally, the extended invariance principle is combined with the least square method to recover the position and clock offset. The obtained parameter estimation performance is close to the Cramer-Rao lower bound of the estimation error.

The application discloses a multi-output low-frequency picosecond mode-locked fiber laser based on a cascade contrast differential beam splitter, which comprises a fiber grating, a gain fiber, a cascade light splitting network, a saturable absorber and a pump coupler for injecting pump light into the gain fiber; the fiber grating, the gain fiber, the cascade light splitting network and the saturable absorber are sequentially connected and constitute a linear resonant cavity with a target set length, and the fiber grating in the linear resonant cavity is connected with the pump coupler to build a linear cavity fiber laser; the length of the entire linear cavity fiber laser can be controlled by controlling the target set length of the linear resonant cavity composed of the fiber grating, the gain fiber, the cascade light splitting network and the saturable absorber, so that the volume of the linear cavity fiber laser is smaller, and meanwhile, after the target set length of the linear resonant cavity is controlled, low repetition frequency can be realized directly in a fundamental mode without complex harmonic mode-locking control.

This invention discloses a dual-screen interactive drawing touch operation synchronous display system, comprising: a dedicated auxiliary touch terminal for collecting user touch operation commands; a low-latency dual-mode transmission module connecting the dedicated auxiliary touch terminal and a main display device for transmitting the touch operation commands and synchronization data between the two; and a synchronous display control module connected to the main display device for receiving commands transmitted by the low-latency dual-mode transmission module and controlling the main display device to perform synchronous rendering and display. This system can be widely applied in professional fields such as engineering design review and medical imaging consultation, significantly improving operational efficiency and collaborative flexibility.

This invention discloses a heavy-duty anti-sway dual-winch synchronous lifting tower crane device and its control method, belonging to the technical field of construction equipment. Addressing the problems of existing tower cranes with single-winch single-lifting structures, such as easy swaying during long load lifting, poor adaptability to non-irregularly shaped loads, low synchronous control accuracy, and insufficient operational stability, this invention's device includes a lifting frame, tower crane boom, a first lifting module, a second lifting module, wire rope, a first winch module, a second winch module, hooks, a fixed platform, and a rotating platform. It is equipped with a dedicated synchronous anti-sway control method, which uses the dual winch modules to coordinate and synchronously wind up and down the rope, achieving traction and sway suppression at both ends of long loads. The winch speed can also be independently adjusted, and the height of the two hooks can be differentiated to adapt to the lifting of non-irregularly shaped loads. This invention combines optimized equipment structure with intelligent synchronous anti-sway control. Components are neatly numbered, and the platform layers do not interfere with each other. It offers stable operation and strong lifting adaptability, suitable for various high-altitude heavy-duty lifting operations in construction, significantly improving lifting stability, operational efficiency, and construction safety.

This invention discloses a rotary multi-contact isolating switch, comprising an operating part, a positioning part, a switching part, and a driving part. The operating part includes an upper housing, a handle, and a rotating shaft. The positioning part includes a positioning housing, a positioning gear, and a telescopic positioning assembly. The positioning gear is fixed to the bottom end of the rotating shaft, and the telescopic positioning assembly cooperates with the positioning gear to achieve position locking. The switching part includes a lower housing, a stationary contact, and a moving contact assembly, with the moving contact assembly slidably installed within the lower housing. The driving part includes a driven ring and a connecting shaft. The connecting shaft transmits the rotational motion of the rotating shaft to the driven ring, which drives the moving contact assembly to quickly disconnect from the stationary contact. This invention achieves accelerated disconnection of the moving and stationary contacts through the cooperation of the driven ring and the contact support block, effectively shortening the arcing time. The moving contact assembly adopts a double-spring structure, separating the contact pressure of the raised driven wheel from the contact pressure of the contact point, improving the contact stability and vibration resistance reliability during long-term operation. The overall structure is stable and highly reliable.

The application discloses a pulse synchronization method, an electronic device, a storage medium and a program product. The method comprises the following steps: acquiring a period quantity sequence generated by local clock counting; performing quality evaluation on a signal according to the period quantity sequence to determine a current signal state; determining a target count value according to the current signal state, and latching the target count value to a corresponding cache space after a latching condition is met; acquiring a current target count value from the cache space, and outputting a pulse synchronization signal based on the current target count value, wherein the pulse synchronization signal is used for pulse synchronization, thereby solving the problem of inaccurate pulse signal synchronization, obtaining a stable target count value, and effectively avoiding problems such as unstable time synchronization and poor precision caused by environmental factors; and counting the output pulse synchronization signal through the current target count value, controlling the output of the pulse synchronization signal, realizing pulse synchronization, and improving synchronization precision and stability.

This application discloses a multi-axis coordinated motion control method and apparatus for a dynamic hovering arc radiotherapy device, relating to the field of equipment control, and particularly to the field of radiotherapy equipment control. The method includes: acquiring the actual position information of multiple execution axes; determining the target control state of the multiple execution axes at the current moment based on the preset target motion trajectory and the actual position information; when the target control state is a linked motion state, controlling the multiple execution axes to perform coordinated motion according to the target motion trajectory; when the target control state is a coordinated locking state, controlling at least one first execution axis among the multiple execution axes to enter a position locking mode, and controlling at least one second execution axis among the multiple execution axes to enter a position maintenance mode. This application solves the technical problem of low multi-axis synchronization accuracy in existing multi-axis coordinated devices (such as dynamic arc radiotherapy devices) during dynamic hovering.

This invention discloses a time synchronization method based on BeiDou satellites, comprising the following steps: S1: acquiring the ephemeris, satellite observation data, and B2b satellite correction data messages of BeiDou-3 satellites; S2: performing anomaly processing on the satellite observation data; S3: combining the ephemeris and the anomaly-processed satellite observation data, using a PPP floating-point solution function model for pseudorange single-point positioning; S4: calculating the satellite's position coordinates based on the ephemeris and B2b satellite correction data messages; S5: inputting the pseudorange single-point positioning result and the satellite's position coordinates into a Kalman filter for filtering, followed by PPP precise single-point positioning processing to obtain the receiver clock bias; S6: inputting the receiver clock bias data into a clock control module to adjust the clock and complete synchronization. In this invention, each device acts as a master station, achieving high-precision positioning of each device through the PPP-B2b model, combining positioning technology with time synchronization technology, thereby improving the synchronization accuracy between devices.

This invention discloses a symbol synchronization method and apparatus based on signal-to-noise ratio (SNR) optimization, relating to the field of digital trunking communication technology. It aims to address the insufficient accuracy of correlation peak-based synchronization methods. The method includes the following steps: S1, receiving a radio frequency (RF) signal, processing it, and then sampling it to obtain a digital sampling sequence; S2, performing a cross-correlation operation between the digital sampling sequence and a locally stored synchronization word, and using the maximum value of the found correlation peak as the initial synchronization position; S3, obtaining the optimal symbol synchronization position near the initial synchronization position through soft decision and SNR calculation; S4, demodulating the data payload at the optimal symbol synchronization position to complete the current frame processing. This invention can achieve both fast acquisition using a synchronization word and high-precision symbol timing.