41results about How to "Increased signal energy" patented technology

The invention relates to a wide band impulse signal detect radar induction reform. It comprises transmitting aerial, receiving aerial, wherein medium plate which is inductivity graded multilayer is posited on the top of soil area, the layered medium which formed wide band impulse signal detect radar is loading induction reform.

The invention discloses a torsional mode magnetostriction sensor array, and belongs to the field of ultrasonic non-destructive testing. According to the phenomenon that an SH wave vibration mode in a plate is similar to a torsional mode in a pipeline, an MPSA (modified planar solenoid array) coil suitable for pipeline configuration and array is provided, and the torsional mode magnetostriction sensor array is designed and researched to excite the torsional mode in a pipeline. Tests verify that a T (0, 1) mode can be excited on a pipeline by the researched torsional mode magnetostriction sensor array, and in the tests, the frequency response characteristic of the sensor array is tested. The sensor array is used for rapidly and effectively detecting the position of a defect in an alloy steel pipe, the positioning precision is relatively high, and a basis is established for implementing two-dimensional defect imaging in the pipeline by the sensor array combined with a phased array principle.

The invention relates to a multi-path slow frequency hopping signal anti-interference processing system which comprises a shunt demodulation unit, a unique code capturing unit, a power deciding unit, a data processing unit and a decoding unit. According to the characteristics of the slow frequency hopping system, the system captures all service hops, judges the power magnitudes of the service hops, detects whether interference exists in received signals or not according to the capture result and the power judging result of each hop, sets data of the service hops with interference to be zero, and decodes phase-adjusted base band demodulation signals through the LDPC decoding method so that it can be ensured that decoding can still be correctly conducted under the condition that interference exists and the anti-interference capacity of the system can be improved; the system accumulates correlation values of multiple service hops within a time slot in the service hop related capturing process and calculates phase errors of the time slot according to the accumulated correlation values, and therefore the time slot phase capturing probability is greatly increased.

The present invention provides a double-layer sector array folded coil structure integrated in a flexible circuit board, and designs and develops an arrayed omnidirectional type horizontal shear modal magnetostrictive transducer. Based on the magnetostrictive effect of ferromagnetic material nickel, the transducer realizes excitation of omnidirectional horizontal shear modal SH wave in the plate structure. Test verifies that the developed arrayed omnidirectional type horizontal shear modal magnetostrictive transducer can excite single SH0 modal waveguide inaluminum plate, and verifies that the developed omnidirectional type horizontal shear modal magnetostrictive transducer has better frequency response characteristics. The developed omnidirectional type horizontal shear modal magnetostrictive transducer and an array combined imaging algorithm can achieve efficient defect imaging on plate structure in wide range and board structure, and has very great value and potential in health monitoring and non-destructive evaluation of the plate structure.

The present invention relates to a method and an apparatus for TDR (time domain reflection) test of a transmission line. In the method, first, a test signal meeting the test requirement of self-correlation and mutual-correlation is determined and transmitted in the transmission line, in which the test signal may be a band-limited random signal, a frequency agility signal, or a regular frequency modulation signal. Then, a TDR test is performed according to the test signal transmitted in the transmission line. The SELT (Single-End Line Test) apparatus configured in accordance with the TDR test solution in the present invention has a good adaptability to environment, a high test accuracy, and an excellent capability of noise resistance. The method of the present invention is very useful for TDR test of large-scaled DSLAM (DSL Access Multiplexer) equipments.

The invention discloses an omnidirectional horizontal shearing modal magnetostrictive sensor, and belongs to the field of ultrasonic non-destructive testing. The sensor comprises a sensor shell, a fan-shaped rubidium-iron-boron magnet, a manually wound spiral coil and a circular nickel plate, the circular nickel plate is adhered on the surface of an aluminum plate to be detected after the edge of the circular nickel plate is grinded, the sensor shell and the rubidium-iron-boron magnet are fixed right above the circular nickel plate, the circular nickel plate can generate shearing deformation based on the magnetostrictive effect of ferro-magnetic nickel and transmits the deformation to the aluminum plate, and an omnidirectional horizontal shearing mode SH0 is excited in a plate structure. An omnidirectional testing experiment verifies that the developed magnetostrictive sensor can excite the horizontal shearing mode SHO spreading along a 360-degree direction. By the aid of the developed omnidirectional horizontal shearing modal magnetostrictive sensor and an array combination imaging algorithm thereof, wide-range and high-efficiency defect imaging of the plate structure can be realized, and the sensor has great application values and potentials in the field of health monitoring and non-destructive evaluation for the plate structure.

The invention provides a feature extraction method for self-adapting stochastic resonance type seismic waves. The feature extraction method comprises the following steps: estimating noise intensity byvirtue of maximum likelihood estimation, establishing a second-order nonlinear bistable stochastic resonance system, and realizing noise matching and frequency matching by optimizing output signal tonoise ratio gain measure and synchronizing Cramers escape rate; and changing the signal frequency according to a preset step length, selecting a maximum signal to noise ratio value as an optimal matching value, and extracting the corresponding signal frequency, namely a target characteristic line spectrum frequency. According to the method, the signal energy and the local signal to noise ratio ata target characteristic line spectrum can be substantially increased, and characteristic signals completely drown in noise can be obviously enhanced and output.

The invention discloses a ladle slag roughing vibration detection device which comprises a box body, at least one vibration shrapnel and at least one sensor, wherein the box body is fixed on an operating arm; the at least one vibration shrapnel is arranged in the box body along multiple directions, and one end of the vibration shrapnel is fixed on the box body or the baffle plate of the box body through a pressing plate; and the at least one sensor is respectively fixed on the vibration shrapnel and is used for detecting the vibration of each vibration shrapnel. The invention also discloses aladle slag roughing vibration detection method which comprises the following steps: arranging the vibration shrapnel for amplifying vibration signals on the operating arm, detecting the vibration signals of the vibration shrapnel by utilizing the sensor, and converting the vibration signals into electric signals; processing the electric signals to form sampling signals; and analyzing the samplingsignals in real time by utilizing a processor to send information of whether to rough slag or not. According to the ladle slag roughing vibration detection device and method provided by the invention, as long as weak vibration signals are detected, the free end of the shrapnel can vibrate to perform the amplifying effect on the signals, so that the sensor acquires the signals with stronger amplitude.

The invention discloses a one-dimensional spherical granular chain nonlinear solitary wave detection sensor, which can realize the stable excitation and detection of nonlinear solitary waves and is used for the nondestructive detection of materials or structures. Shock particles are controlled by an electromagnetic valve to shock a one-dimensional spherical granular chain from a fixed height in a free falling body manner to form nonlinear solitary waves propagating along the one-dimensional spherical granular chain, when the nonlinear solitary waves are propagated to observation particles, a displacement of the solitary waves can be sensed by a piezoelectric material embedded in the observation particles, can be outputted in a voltage form and is called incidence solitary waves; when the nonlinear solitary waves propagated to an interface of the particles on the tail end of the one-dimensional spherical granular chain and the material or structure to be detected, reflection is generated, the nonlinear solitary waves re-enter the one-dimensional spherical granular chain, the nonlinear solitary waves can be re-sensed by the piezoelectric material in the observation particles in the propagation process, and an output voltage signal is called reflection solitary waves. By utilizing a flying time difference or an amplitude ratio between the reflection solitary waves and the incidence solitary waves, nondestructive evaluation can be performed for the rigidity or damage of the material or structure to be detected.

The invention discloses an upload amplified coaxial Ethernet access terminal device which comprises an RJ-45 data port set, an Ethernet exchange chip, an Ethernet over coax media access control (EOCMAC) chip, and EOC physical layer chip, a network transformer, a combining filter, a data coaxial port F, a cable television coaxial port F and an upload amplifier. A high frequency output port of the combining filter is connected with the cable television coaxial port F. A low frequency output port of the combining filter is connected with the data coaxial port F. The combining filter is connected with the network transformer. A download data port of the network transformer is connected with the EOC physical layer chip. An upload data port of the network transformer is connected with the upload amplifier. The upload amplifier is connected with the EOC physical layer chip. The upload amplified coaxial Ethernet access terminal device is matched with a local side device so that an existing cable television coaxial network is fully used and point-to-multipoint broadband access with low cost and high property can be achieved.

A method and apparatus for detecting previous packet loss in non-packetized speech by applying one or more filters to a segment of said non-packetized speech, each of said one or more filters determining an energy parameter value for a given frequency band of said segment of said non-packetized speech; comparing one or more of said determined energy parameter values to one or more corresponding thresholds; and detecting previous packet loss based on said comparison of said one or more of said determined energy parameter values to said one or more of said corresponding thresholds.

The invention discloses a multi-antenna OFDMA signal decoding method based on rapid and independent component analysis. The method comprises the following steps: step 1, establishing a signal model for meeting the requirement of a rapid and independent component analysis algorithm on an input signal; step 2, conducting PCA whitening on an observation vector under Gaussian noise; step 3, separating a plurality of user information modulated on OFDMA subcarriers without knowing any information about the subcarriers; and step 4, performing subcarrier sequence estimation and OFDMA user identification. According to the method, mathematical statistical modeling is conducted on multi-antenna OFDMA signals based on Fast-ICA, and blind channel estimation and decoding are also performed, so that the signal energy is increased without removing a cyclic prefix, and the decoding performance is improved. Through adoption of the method, timing is not needed at a receiving end, blind separation and decoding are conducted on the OFDMA signals, and the decoding performance is good.

The invention provides a seismic wave feature extraction method self-adaptive to stochastic resonance. The method includes: adopting maximum likelihood estimation to estimate noise intensity, buildinga second-order nonlinear bistable-state random resonance system, and realizing noise matching and frequency matching by optimizing output signal-to-noise ratio gain measure and synchronous Cramer escape rate; changing signal frequency according to set step length, selecting a signal-to-noise ratio maximum value as an optimal matching value, and extracting signal frequency corresponding to the optimal matching value, namely target feature line spectrum frequency. By the method, signal energy and local signal-to-noise ratio at a target feature line spectrum position can be increased substantially, and feature signals in completely-submerged noise can be obviously enhanced and output.

The invention discloses a multichannel laser induced breakdown spectrometer and a multichannel spectral detection method. The spectrometer comprises a circular ring flange and a laser, wherein a plurality of detection lens groups are uniformly mounted on the circular ring flange; the laser is arranged at the center of the circular ring flange; the transmitting end of the laser and the light incidence end of each of the detection lens groups face to a detected object; connecting optical fibers are arranged at the light emergence end of the of each of the detection lens groups, the tail ends ofthe connecting optical fibers are combined into an optical fiber bundle, and the optical fiber bundle is connected with a spectral detector; after the laser emits laser light, a plasma substance is induced from the detected object, and light radiated during the energy level transition is received by the plurality of detection lens groups on the circular ring flange and transmitted to a spectrum detector by the connecting optical fibers and the optical fiber bundle. The multichannel laser induced breakdown spectrometer and the multichannel spectral detection method disclosed by the invention not only can solve the selection problem of a receiving angle, but also can enhance the signal energy finally entering the spectrum detector through a multichannel mode, thereby improving the signal-to-noise ratio.

The invention provides a multi-beam switching cylindrical array antenna structure and a radar system. The multi-beam switching cylindrical array antenna structure comprises a transmitting module and a receiving module which are oppositely arranged in the pitching direction, wherein a metal gap is formed between the transmitting module and the receiving module; the transmitting module comprises a plurality of transmitting array elements which are circumferentially distributed in the azimuth direction, and the receiving module comprises a plurality of receiving array elements which are circumferentially distributed in the azimuth direction; the transmitting array elements and the receiving array elements are the same in number and are arranged in the pitching direction in a one-to-one correspondence mode. On the basis of the multi-beam switching cylindrical array antenna structure, arbitrary switching and combination of various beams can be realized at the transmitting module part by controlling the phase of each channel, full coverage of 360-degree space is realized, a specific transmitting waveform is formed, and the detection distance is increased under the condition of limited transmitting power; in the receiving module part, signals are independently received through the plurality of receiving array elements so that the signal energy in a main wave beam range can be increased.

The invention provides a message demodulation method and device, and the method comprises the steps: obtaining a differential phase value corresponding to the phase value of a to-be-demodulated message and a corresponding maximum likelihood ratio, and storing the differential phase value and the maximum likelihood ratio in a buffer Buffer; obtaining a first message of the first M bits in the buffer Buffer; and when the first message does not pass the preset verification, accumulating the M-bit message after a preset time interval with the first message to obtain a second message, and outputting the message words of the second message. With application of the scheme, the tracking output signal energy is increased through accumulation and the signal-to-noise ratio is increased; besides, thereliability of accumulated message judgment is improved through a probability statistics method of the maximum likelihood ratio, the sensitivity of message decoding is further improved and the problemof inaccurate positioning caused by errors due to frequent message demodulation in related technologies is solved.

The invention relates to a vibration and noise reduction method for a nuclear power unit pipeline system based on fractional order PID control. A nuclear power plant typical pipeline system mathematical model established through a dynamic equation can better describe the actual system condition; controller parameters, namely a proportional gain Kp, an integral gain Ki, a differential gain Kd, an integral order lambda and a differential order mu, which enable the system vibration suppression effect to be optimal can be quickly found by using a particle swarm optimization algorithm; compared with an open-loop control method and a closed-loop control method, the vibration suppression of the typical pipeline system of the nuclear power device can be effectively realized by introducing the fractional order PID controllers; after a fractional order PID output feedback controller is introduced, the maximum vibration signal energy can be reduced by 9% on the basis of an open loop. After a fractional order PID state feedback controller is introduced, the maximum vibration signal energy can be reduced by 35% on the basis of an open loop.

The invention discloses a single-channel vibration signal blind source separation method, including the following steps: S1. multi-path original single-channel vibration observation signals arriving from paths are subjected to in-phase superposition, and then the superposed original single-channel vibration observation signal is subjected to denoising treatment, thereby obtaining a denoised single-channel vibration observation superposed signal; S2. wavelet decomposition and reconstruction are utilized to convert the denoised single-channel vibration observation superposed signal into a multi-channel vibration observation signal; and S3. a blind source separation algorithm based on time frequency analysis is utilized to analyze the multi-channel vibration observation signal, thereby obtaining an estimated signal of the original single-channel vibration observation signal, and realizing single-channel vibration signal blind source separation. The single-channel vibration signal blind source separation method provided by the invention can enhance signal energy of the original single-channel vibration observation signal, can reduce noise, enables a blind source separation effect to be relatively good, and effectively improves the signal to noise ratio of the signal, and the method is simple, is convenient to use, is low in cost.

The present invention provides a double-layer sector array folded coil structure integrated in a flexible circuit board, and designs and develops an arrayed omnidirectional type horizontal shear modal magnetostrictive transducer. Based on the magnetostrictive effect of ferromagnetic material nickel, the transducer realizes excitation of omnidirectional horizontal shear modal SH wave in the plate structure. Test verifies that the developed arrayed omnidirectional type horizontal shear modal magnetostrictive transducer can excite single SH0 modal waveguide inaluminum plate, and verifies that the developed omnidirectional type horizontal shear modal magnetostrictive transducer has better frequency response characteristics. The developed omnidirectional type horizontal shear modal magnetostrictive transducer and an array combined imaging algorithm can achieve efficient defect imaging on plate structure in wide range and board structure, and has very great value and potential in health monitoring and non-destructive evaluation of the plate structure.

The invention relates to a method for detecting blocked pressure lines in an SCR system of an internal combustion engine. The SCR system has a transfer pump, a metering module and a pressure sensor. The method comprises the following steps: on the one hand, when the reducing agent solution is not added through the metering module, the measurement time (t M ) to measure a reference signal of the pressure (p) in the pressure line, and subsequently calculate the signal energy of the reference signal. On the other hand, during the metering time (t M ), and then calculate the signal energy of the pressure signal. Finally, the ratio of the signal energy of the pressure signal to the signal energy of the reference signal is calculated. If the ratio falls below a first predeterminable threshold value, a blocked pressure line is detected.

The invention discloses a fast, accurate, simple and practical beam-scanning-based coordinated multiple point (CoMP) realization method, which comprises the following steps of: selecting an edge user in a serving cell as a CoMP user; selecting more than one adjacent base station as coordinated base stations; scanning the serving cell and a coordinated cell with the coordinated base station by adopting beams respectively, and computing pre-coding matrixes of a serving base station and the coordinated base stations for the CoMP user according to scanning results and a pre-coding matrix computing formula provided by the invention respectively; and pre-coding signals to be transmitted to the CoMP user and transmitting the pre-coded signals by using the serving base station and the coordinated base stations. The invention correspondingly discloses a beam-scanning-based CoMP realization system, which comprises a CoMP user selection module, a coordinated base station selection module, a beam scanning module and a signal transmission module.

The invention discloses an output processing method of audio signals of wearable equipment and the wearable equipment. The method includes: obtaining to-be-output audio signals of the wearable equipment; obtaining a phase adjusting parameter corresponding to each bone conduction oscillator of a bone conduction oscillator matrix of the wearable equipment; performing phase adjustment on the to-be-output audio signals based on the phase adjusting parameter corresponding to each bone conduction oscillator to obtain a target audio signal corresponding to each bone conduction oscillator; and outputting the target audio signal to the corresponding bone conduction oscillator, controlling all the bone conduction oscillators of the bone conduction oscillator matrix, converting the corresponding target audio signals to vibration signals, and transmitting the vibration signals through skin and bone media so that the vibration signals of all the bone conduction oscillators of the bone conduction oscillator matrix are superposed with the same phase at a certain position in a transmission process through the skin and the bone media. According to the method and the wearable equipment, the attenuation of the audio signals in the transmission process is reduced, the tone quality is guaranteed, the sound leakage is prevented, and the user privacy is protected.

Provided are a method for compressing channel measurement parameters in a wireless local area network and a wireless device. The method includes: the first wireless device receives the wireless signal sent by the second wireless device through the first channel; the first wireless device measures the wireless signal to obtain the initial time-domain characteristic parameters of the first channel, and the initial time-domain characteristic parameters include M Sampling data, M is an integer greater than 1; the first wireless device determines the target time domain characteristic parameter of the first channel according to the initial time domain characteristic parameter, the target time domain characteristic parameter is composed of N sampling data in the M sampling data, N The signal energy corresponding to any one of the sampled data is greater than or equal to the first energy threshold, and N is a positive integer smaller than M; the first wireless device sends the target time domain characteristic parameter to the second wireless device. The compression of the channel measurement parameters reduces the bandwidth occupied when transmitting the channel measurement parameters.

The invention discloses a method and device for resource block grouping and multi-antenna beamforming. A base station groups all resource blocks under the current transmission bandwidth of adjacent cells, maps the resource blocks to beams, and obtains reference signal selection based on user measurements. CoMP cooperative users, the base station exchanges CoMP cooperative user information with adjacent base stations, and performs joint beamforming according to the corresponding resource blocks; the method of the present invention changes the original interference cell into a signal transmitting cell, and the signal energy increases , the interference is reduced and the gain obtained is obvious. On the other hand, adjacent resource blocks are divided into different resource block groups, thereby bringing about a certain frequency diversity gain.

When processing a signal having a sequence of discrete values, wherein there is a first frequency range, in which the signal has a high energy, and wherein there is a second frequency range, in which the signal has a low energy, the sequence of discrete values is first manipulated to obtain a sequence of manipulated values, so that at least one of the manipulated values is non-integer. Then the sequence of manipulated values is rounded to obtain a sequence of manipulated values. The rounding is formed to effect a spectral shaping of a generated rounding error so that a spectrally shaped rounding error has a higher energy in the first frequency range than in the second frequency range. By spectrally shaping the rounding error so that the rounding error does not have any energy either in the storage areas where there is no signal energy, an especially efficient coding is obtained particularly in connection with a lossless coding context.

The present invention provides a method and device for demodulating a message, wherein the method includes: obtaining a differential phase value corresponding to a phase value of a message to be demodulated, and a corresponding maximum likelihood ratio value, and combining the differential phase value and the obtained The maximum likelihood ratio value is stored in the cache Buffer; the first M-bit first message is obtained in the cache Buffer; when the first message fails the preset check, the M-bit message after the preset time interval After accumulating with the first message, the second message is obtained, and the text of the second message is output. Using the above scheme, on the one hand, the signal energy of the tracking output is increased by accumulation, and the signal-to-noise ratio is improved; on the other hand, the maximum likelihood The probability statistics method of random ratio improves the reliability of message judgment after accumulation, further improves the sensitivity of message decoding, and solves the problem of inaccurate positioning caused by frequent errors in message demodulation in related technologies.

The embodiment of the invention provides an antenna control method and device based on fire-fighting linkage, and the method comprises the steps: receiving a linkage control instruction transmitted by a fire-fighting linkage system through an antenna control device, and adjusting the heights and / or transmitting parameters of antennas of a plurality of fire-fighting partitions related to a fire position according to the linkage control instruction. According to the antenna control method and device based on fire-fighting linkage provided by the embodiment of the invention, the antennas of the fire-fighting subarea where the fire position is located and the fire-fighting subarea of the related area of the fire position can penetrate through the smog resident layer area, signal attenuation caused by smog can be reduced, and the fire-fighting effect is improved. According to the utility model, the signal transmitted by the antenna can be higher in energy, more concentrated and farther in propagation distance, the communication requirements of personnel evacuation and escape, trapped personnel rescue and fire extinguishing can be met when a fire occurs, and a more effective communication guarantee can be provided.