17 results about "Carrier synchronization" patented technology

The present disclosure belongs to the technical field of physical carrier synchronization, and relates to a trajectory prediction method and device, a storage medium and an electronic device. The method comprises the following steps: receiving first carrier movement data corresponding to a game carrier sent by a server, and determining second carrier movement data possessed by the game carrier at a current time; the first carrier movement data comprises a data sending time; if the current time is greater than the data sending time, the first carrier movement data and the second carrier movement data are calculated respectively, and a first carrier position corresponding to a first target time and a second carrier position corresponding to the current time are obtained; the first target time is different from the current time by a time interval; and the first carrier position and the second carrier position are mixedly calculated to predict a carrier position of the game carrier at the first target time. In the present disclosure, the accuracy of the predicted carrier position is increased.

This invention discloses an adaptive blind demodulation method, system, terminal, and medium based on a satellite communication system. The method includes: performing parameter estimation, frequency offset compensation, and timing synchronization processing on the original baseband sampled data sequence to obtain a single symbol rate data symbol sequence; performing hierarchical phase-locked loop carrier coarse synchronization iterative processing on the single symbol rate data symbol sequence to obtain a target convergent constellation diagram symbol sequence; extracting high-order cumulant features based on the target convergent constellation diagram symbol sequence and performing modulation scheme identification and confidence judgment, iterating until a preset judgment condition is met to obtain a target modulation identification result; and performing adaptive carrier fine phase-locking and blind equalization joint processing on the target modulation scheme to obtain a demodulated symbol sequence. This invention solves the coupling problem between carrier synchronization and modulation identification by combining hierarchical carrier synchronization, high-order cumulant feature identification, and adaptive fine phase-locking blind equalization, thereby improving demodulation reliability.

This application provides a method and system for voltage regulation control of an on-board DC power supply based on multi-stage converters, relating to the field of power supply voltage regulation control technology. The method involves extracting disturbance characteristics of the input voltage of the front-stage converter; determining the feedforward compensation amount of the outer loop of the subsequent converter voltage; determining the voltage regulation control command of the subsequent converter based on the feedforward compensation amount and the reference command of the subsequent converter voltage outer loop; synchronizing the start time of the carrier cycle of the front-stage converter with the start time of the carrier cycle of the subsequent converter to obtain a cooperative switching cycle of the shared carrier synchronization signal between the front-stage and subsequent converters; updating the duty cycle of the switching transistors of the subsequent converter during the cooperative switching cycle; and feeding back the real-time voltage of the intermediate DC bus under voltage tracking state to the control loop of the front-stage converter. This application can realize synchronous voltage regulation of multi-stage DC converter circuits under dynamic operating conditions, thereby improving the transient stability capability of the on-board DC bus.

This application provides a carrier synchronization method, a carrier synchronization device, a terminal device, a computer-readable storage medium, a computer program product, and a chip system for a computing device. The method may include filtering a communication signal from a network device using a first filter to obtain a filtered signal, wherein the bandwidth of the first filter is determined based on the bandwidth of the communication signal and a first frequency offset range, and the first frequency offset range is determined based on the maximum frequency offset between the terminal device and the network device; performing coarse carrier synchronization processing on the filtered signal to determine a first signal; performing fine timing synchronization processing on the first signal to determine a second signal; and performing fine frequency offset synchronization and phase synchronization based on the second signal. This application allows signals within the frequency offset range to be received in a single operation, reducing network search time.

The application provides a carrier frequency synchronization method applied to a frequency hopping data transmission system, the frequency hopping data transmission system comprising a transmitting end and a receiving end, and the method comprises the following steps: the transmitting end processes to-be-sent data into a data frame, adds a pilot head based on a ZC sequence to the data frame to form a frequency hopping data transmission frame, and sends a radio frequency signal carrying the frequency hopping data transmission frame to the receiving end; the receiving end acquires the radio frequency signal, processes the radio frequency signal into a digital signal; carrier synchronization processing is performed on the digital signal, carrier frequency scanning is performed on multiple frequency hopping points to screen effective communication frequency points; the starting position of the data frame is determined according to the effective communication frequency points, data demodulation and decoding are performed on the data frame, and original data is recovered. Through the application, the excellent autocorrelation characteristics of the ZC sequence and the intelligent double-peak detection mechanism are utilized to realize carrier frequency synchronization without strict time synchronization, and fast and anti-interference data transmission is completed.

This invention provides a multi-format, multi-rate adaptive blind demodulation method, terminal device, and storage medium, belonging to the field of space laser communication technology. The invention acquires a baseband IQ signal; performs spectral analysis on the signal to obtain power spectrum characteristic parameters and estimate the 3dB bandwidth; calculates whether effective spectral peaks appear based on the characteristic parameters in the power spectrum, thereby determining the modulation format of the signal and estimating the frequency offset, and finding the maximum spectral line in the envelope spectrum, the position of which is the symbol rate spectral line; based on the modulation format and symbol rate estimation, carrier synchronization, timing synchronization, and symbol decision are performed on the signal to complete the demodulation. This invention enables demodulation of received signals by analyzing the spectral characteristics of the signal to determine the modulation format and estimate the symbol rate when the signal modulation format and symbol rate are unknown. The technology of this invention does not involve complex algorithms and is easy to implement in hardware.

The application provides a residual frequency offset and phase offset joint estimation method and device based on linear fitting, which comprises the following steps: obtaining symbol data after symbol synchronization based on a preset target modulation mode, obtaining a signal model based on the symbol data, obtaining a continuous phase sequence of the signal model, performing linear fitting based on the continuous phase sequence, calculating a residual frequency offset estimation value, compensating the signal model based on the residual frequency offset estimation value to obtain a target signal model after residual frequency offset compensation, performing operation on the target signal model and solving to obtain a phase value of each symbol sample, taking an average value of the phase value of each symbol sample to obtain a final initial phase offset estimation value, and performing phase compensation on the target signal model based on the initial phase offset estimation value to obtain target symbol data after final carrier synchronization.

The application discloses a kind of multi-converter parallel carrier synchronization method and device, multiple converters are connected by parallel, and one of them is used as master converter, the rest is used as slave converter, method includes: generating reference carrier signal by first processing module, the reference carrier signal is used to realize the carrier synchronization between multiple converters;The generated reference carrier signal is transmitted to each slave converter by hardware sending module;Slave converter receives reference carrier signal by hardware receiving module, and compares and adjusts with the current carrier signal of slave converter, to realize the synchronization with the reference carrier signal of master converter.The carrier signal generated by the application has strong stability, high precision, low delay, strong anti-interference, high transmission efficiency and low processing complexity during long-distance signal transmission, thereby effectively controlling the cost, and making the synchronization consistency effect between converters better.

This invention proposes a carrier synchronization control method for energy storage systems. The method includes selecting one branch from N parallel branches as the master branch and the remaining N-1 branches as slave branches; determining the master cabinet from multiple energy storage cabinets within the master branch through a dynamic competition mechanism, and designating the remaining energy storage cabinets within the master branch and all energy storage cabinets within the slave branches as slave cabinets; the master cabinet sending a carrier synchronization signal to all slave cabinets; and the slave cabinets calculating the phase offset between their own carrier and the carrier synchronization signal based on the received carrier synchronization signal, and performing carrier phase compensation accordingly. This invention, by selecting the master branch and having its master cabinet, generated through competition, uniformly distribute the carrier synchronization signal; and by having each slave branch's master cabinet and slave cabinets receive and compensate for the signal, it effectively suppresses common-mode interference and prevents malfunctions in the battery management system and fire suppression system. Furthermore, slave branches can switch to master branches at any time, further enhancing the system's fault-tolerant operation capability.

The application discloses a reconstruction method, in particular to a ground digital television multimedia broadcast reference signal high-quality reconstruction method, which comprises the following steps: step 1, high-precision synchronization and parameter tracking; step 2, robust channel estimation and equalization; step 3, soft information demapping and iterative decoding; step 4, bit stream re-modulation. The two-stage synchronization mechanism combining coarse synchronization and fine synchronization, combined with the improved windowing peak detection algorithm and dynamic threshold, can effectively resist noise and multipath interference, and significantly reduce the false alarm and missed detection probability. The joint tracking loop continuously compensates the carrier frequency deviation and the sampling clock deviation, effectively suppresses the phase noise and the inter-subcarrier interference, and ensures stable timing and carrier synchronization under high-speed movement and severe channel conditions.

This invention discloses an integrated laser ranging and communication method based on baseband signal combining modulation: Step 1: On satellite A, a laser emitter generates laser light; Step 2: The power ratio of the communication signal to the pseudocode signal is set to P; Step 3: The communication signal and the pseudocode signal are input into a microwave combiner for combining, and then enter the MZM to obtain the modulated laser; Step 4: The modulated laser light enters an optical amplifier and is then emitted; Step 5: On satellite B, an optical antenna receives the signal light; a local oscillator laser generates a light wave; Step 6: The light wave and the signal light are mixed in a coherent receiving module to generate two orthogonal intermediate frequency signals; Step 7: The signal processing module performs carrier synchronization on the two orthogonal signals and sends them to the communication demodulation unit and the pseudocode acquisition and tracking unit. This invention achieves the goal of integrating precision measurement and laser communication with minimal impact on the signal-to-noise ratio of the communication link.

The application provides a carrier phase synchronization method, device, equipment and medium, the method comprises the following steps: a controller acquires the difference value of the optimal carrier phase reference value and the local carrier phase, and generates a normalized phase difference after normalization; the absolute value is calculated by a segmented function, and the carrier period register value is modified accordingly. When the normalized phase difference and the change quantity of the continuous multiple periods are lower than two threshold values respectively, the register restores the rated value; then the three-phase output current of the converter is collected, the zero sequence circulating current is calculated, and the carrier frequency component is extracted. With the component amplitude tending to zero as the target, the phase compensation quantity is calculated through the model reference adaptive control law, the optimal carrier phase reference value is updated, and synchronization is realized. The method first adaptively and gradually adjusts the segmented function of the normalized phase difference, then introduces the model reference adaptive closed-loop fine tuning of the zero sequence circulating current carrier frequency component feedback after meeting the stability condition, and realizes the carrier synchronization with no transient impact, high precision and stability.

A power conversion apparatus includes an AC-DC conversion circuit, a power controller, and a circulating current controller. The power controller is configured to control the AC-DC conversion circuit to convert a received alternating current into a first direct current and output the first direct current. The circulating current controller is configured to send a synchronization signal to another power conversion apparatus through a controller area network (CAN) bus. The synchronization signal is used to synchronize a carrier of the another power conversion apparatus with a carrier of the power conversion apparatus.

The application provides a time base synchronization-based anti-interference carrier synchronization control method, system and medium, which comprises the following steps: step 1: a master device generates a time base synchronization signal, and the time base synchronization signal is subjected to signal conditioning treatment such as pulse width expansion, period adjustment or signal screening by a CPLD; step 2: the time base synchronization signal is converted into a differential signal by a CAN transceiver and transmitted to all slave devices through a CAN bus; and step 3: after receiving the differential signal, the slave device converts the differential signal into a single-ended signal through the CAN transceiver, configures a PWM pulse controller of a digital signal processor (DSP) of the slave device, takes the time base synchronization signal generated by the master device as a synchronization source of all PWM channels, and reloads a PWM time base count value when the digital signal processor (DSP) of the slave device detects a rising jump edge, so as to realize synchronization of a carrier of the slave device and a carrier of the master device. The application has the advantages of simple structure, low cost and strong anti-interference capability.

This invention discloses a remote smart meter reading method and system, specifically relating to the field of smart meter reading. It addresses the problem that existing remote smart meter reading methods rely solely on address fields and frame verification for response confirmation, making it difficult to identify abnormal responses, equipment aging, and coupling loop drift in complex power line environments. By extracting the synchronization convergence fingerprint vector during carrier synchronization establishment and the current transient feature vector during response frame transmission, a dynamic correspondence between communication synchronization behavior and electrical transient behavior is constructed. Topology preservation comparison is performed on the current response pulse, and the trajectory is predicted based on the inferred current transient feature vector from historical meter reading records. A homogeneity determination result is generated by combining the trajectory deviation and transient topology preservation degree. Simultaneously, a dynamic coupling stability sequence is constructed to achieve stable uploading of remote smart meter reading results and anomaly identification, improving the automation level of meter reading management and user service experience.

The application provides a carrier synchronization method of a parallel energy storage converter, electronic equipment and a storage medium, and relates to the technical field of power electronics. The method comprises the following steps: determining the time when a slave captures a carrier synchronization signal sent by a master, and recording the time as a target time; determining the value of a slave PWM carrier time base counter corresponding to the target time, and recording the value as a target count value; determining whether the master and the slave are synchronized according to the target count value; and if not, adjusting the slave PWM carrier frequency according to the target count value so that the master and the slave are synchronized. The application can quickly capture the carrier synchronization signal of the master, accurately adjust the slave PWM carrier frequency based on the value of the slave PWM carrier time base counter at the capturing time, realize carrier synchronization of the master and the slave, and improve the operation stability and reliability of the parallel energy storage converter system.

The application discloses the technical field of energy storage converter control technology, a converter, a fault detection and repair method of a carrier synchronous pulse signal of the converter and a computer program product thereof, and aims to solve the technical problem that the operation capacity, precision and flexibility of the fault detection / repair method cannot be considered simultaneously. The application comprises the following steps: letting a field programmable gate array handle the fault detection task of the carrier synchronous pulse signal of the converter which requires high parallel processing capacity, fully exerting the stronger parallel processing capacity and reaction capacity of the field programmable gate array relative to a digital signal processor, improving the precision of fault detection and providing flexibility for repair; and letting a digital signal processor execute the repair task which is more complex than the detection task, fully exerting the strong operation capacity of the digital signal processor relative to the field programmable gate array, accurately processing the fault by using the high-efficiency operation capacity of the digital signal processor on the basis of the accurate fault source detected by the field programmable gate array, and flexibly processing the fault.