10results about How to "Accurate demodulation" patented technology

The invention is suitable for the technical field of data processing, and provides an illumination lamp data transmission system, which comprises a plurality of illumination lamps, a plurality of PLC concentrators respectively connected with the illumination lamps on an electric power circuit in a region where the illumination lamps are located, LPWAN gateways connected with the PLC concentrators, and a monitoring center communicating with the LPWAN gateways through an LPWAN network. The lighting lamp is provided with a data acquisition module and a PLC module; the PLC concentrator is provided with a modulation-demodulation module, an error detection module and a data forwarding module; the LPWAN gateway is provided with a data coding module, a data packaging module and an LPWAN communication module; the monitoring center comprises a data receiving module, a decoding processing module and a data processing module. The problem that an existing lighting lamp is poor in data transmission signal stability in a special environment where communication is inconvenient is solved.

The present specification relates to the technical field of fiber-optic gyroscopes, and discloses a reciprocal structure 3x3 fiber-optic gyroscope and a use method thereof, to solve the problems of poor anti-interference, complex calculation, and no consideration of the influence of temperature change on test results, poor environmental adaptability, and limited practicality of a typical non-reciprocal structure 3x3 fiber-optic gyroscope; three photoelectric detectors, a 2x2 coupler, a 3x3 coupler, a temperature sensor, and a signal processing module; the 2x2 coupler, the 3x3 coupler, the first photoelectric detector D1, the second photoelectric detector D2, and the third photoelectric detector D3 constitute a reciprocal structure 3x3 fiber-optic gyroscope optical path. The reciprocal structure 3x3 fiber-optic gyroscope extracts a reciprocal end output signal, uses the reciprocal end output signal as a reference quantity for differential demodulation, eliminates the influence of optical path loss variation and light source fluctuation on the gyroscope output signal, and greatly improves the anti-interference of the gyroscope system.

The invention relates to the technical field of ultrasonic emission, and particularly provides an arbitrary waveform ultrasonic generation method for demodulating a pulse width modulation signal by using frequency response characteristics of a transducer. The method comprises the following steps: acquiring frequency response characteristic data of a target ultrasonic transducer; calculating a modulation function for modulating the duty ratio of the pulse width modulation signal; generating a high-voltage pulse width modulation signal sequence; directly driving the target ultrasonic transducer by the high-voltage pulse width modulation signal sequence, and filtering and demodulating the high-voltage pulse width modulation signal sequence by using the frequency response characteristic of a mechanical vibration system of the target ultrasonic transducer as a natural low-pass filter, and generating an ultrasonic wave corresponding to the target ultrasonic waveform. According to the invention, the fundamental simplification of the system structure is realized, high-fidelity arbitrary waveform ultrasonic output is obtained on the basis of keeping high-efficiency switch driving, and the system has excellent waveform flexibility and adaptive capacity to transducer characteristics.

The application belongs to the field of optical fiber interference measurement and phase generated carrier demodulation technology, and particularly relates to a method for improving a phase generated carrier algorithm to demodulate a low-frequency signal, which is based on three times frequency phase generated carrier mixing, uses an inverse tangent algorithm to demodulate a low-frequency signal, and is combined with an ellipse fitting algorithm to correct non-orthogonal signals and compensate linear errors in real time. In the process of demodulating a low-frequency signal, the application is not affected by carrier modulation depth and light intensity disturbance, avoids the direct current drift problem existing in traditional PGC-DCM in low-frequency signal demodulation, improves the accuracy of demodulation results, and reduces the interference of error factors.

The invention belongs to the field of fluorescent optical fiber sensors, and particularly relates to a preparation and use method of a portable down-conversion tellurate optical fiber temperature sensor. At present, most (doped) tellurate optical fibers based on the fluorescence intensity ratio technology are upconversion materials and are difficult to couple with multimode optical fibers, the sensitivity needs to be improved when the (doped) tellurate optical fibers serve as temperature sensors, and laser exciters large in weight and size are needed. Aiming at the problems in the prior art, TeO2, ZnO, Bi2O3 and Er2O3 are adopted to prepare the down-conversion rare earth doped tellurate optical fiber, and the coupling performance is good when the down-conversion rare earth doped tellurate optical fiber is welded with a multimode optical fiber; the prepared temperature sensor is high in sensitivity and good in stability; and an ultraviolet lamp is adopted for pumping, so that temperature monitoring is facilitated.

The invention relates to the technical field of wireless communication, and discloses a signal sequence recovery method and system, computer equipment and a storage medium, and the signal sequence recovery method comprises the steps: receiving a target signal sequence transmitted by a signal transmitting end in a satellite communication system, constructing an original optimal sampling point set based on the symbol information of the target signal sequence, constructing an optimal sampling point judgment feature set based on a preset feature type; calculating the information gain ratio of each judgment feature in the optimal sampling point judgment feature set based on the original optimal sampling point set, and screening out the optimal sampling point judgment feature; and determining an optimal sampling point based on the optimal sampling point judgment feature, and performing nonlinear interpolation on the target signal sequence according to the optimal sampling point, thereby realizing symbol synchronization and instant clock recovery in the satellite communication process. According to the invention, by calculating the information gain ratio of each judgment feature in different scenes, the judgment feature with the optimal timing recovery precision, the lowest calculation overhead and the highest robustness can be screened out.

The application relates to the technical field of network digital information transmission control, and discloses a scheme for analyzing AUX data in a DP signal, which comprises the following steps: generating an active signal through capturing the first edge of an auxiliary channel bus, triggering an external interrupt to start a direct memory access channel, and writing Manchester encoding differential data into a unidirectional buffer chain table; dynamically updating the buffer chain table through transmission half and completion interrupts during transmission to extend the storage space; forcibly extracting and demodulating non-full load tail packet data by using an idle timer timeout signal, and identifying a transmission mode to separate display device configuration information. The application reduces the clock overhead of a central processing unit under asynchronous communication, avoids the data covering and overflow risks caused by a fixed length buffer area, and realizes complete reconstruction of variable length frame tail data in a variable length asynchronous transmission environment without a special transceiver.

This application relates to the field of fiber optic sensing measurement and engineering structure stress analysis technology, and particularly to a method for measuring the thermal stress of a boiler structure based on fiber Bragg grating technology. The method includes: S1 sensor deployment; S2 spectral signal transmission; S3 spectral line preprocessing; S4 center wavelength demodulation; S5 thermal stress inversion; S6 stress map reconstruction; and S7 anomaly identification. This application achieves synchronous sensing and precise decoupling of temperature and strain in high-temperature and complex environments by deploying decoupled fiber Bragg grating sensors in key stress areas of the boiler structure and introducing a Bragg reflection center wavelength response model. This response mechanism, based on the nonlinear coupling relationship between wavelength drift and temperature or strain, effectively avoids the problems of traditional thermocouples and resistance strain gauges being susceptible to temperature drift interference and having limited deployment numbers, significantly improving the accuracy and distribution integrity of thermal stress identification.

A wireless communication system according to an embodiment is a wireless communication system in which a reception device demodulates a signal on the basis of a training signal transmitted by a transmission device that performs single-carrier multi-level modulation, in which the transmission device transmits the training signal to the reception device such that a plurality of signal points having different amplitudes on a constellation is included, and the reception device includes: an estimation unit that estimates the signal points included in the training signal of a case where it is assumed that, on the basis of characteristic information indicating an input-output characteristic including a non-linear region of an amplification unit that is provided in the transmission device and amplifies a signal to be transmitted, an input-output characteristic in a non-linear region of the amplification unit is also linear; an equalization unit that performs initial equalization on a received signal; a correction unit that corrects a signal subjected to initial equalization by the equalization unit on the basis of the signal points estimated by the estimation unit; a likelihood calculation unit that calculates, with respect to a constellation before the amplification unit amplifies a signal, a likelihood of a signal corrected by the correction unit; and a demodulation unit that demodulates a signal on the basis of the likelihood calculated by the likelihood calculation unit.

The invention discloses a pulse continuous signal demodulation method and device, electronic equipment and a storage medium, and the method comprises the steps: determining a pulse continuous signal which is obtained after a first phase period of a phase signal is modulated and converted into 1.5 times of an original phase period, the phase signal is obtained by encoding a digital signal, and then channel transmission is carried out; performing discretization processing on the pulse continuous signal through a discretized wavelet function to obtain an intermediate signal; decomposing the intermediate signal to obtain a high-frequency coefficient and a low-frequency coefficient; and demodulating the pulse continuous signal according to the high-frequency coefficient and the low-frequency coefficient. According to the invention, accurate demodulation of the pulse continuous signal can be realized, and the robustness and reliability of the drilling fluid pulse communication mode are improved.