30results about How to "Strong ability to suppress noise" patented technology

The invention relates to baseband signal processing device and method of a multiple-mold communication system. The method comprises the following steps of: forming a baseband signal and a control word used in network maintenance into an Ethernet frame; sending the Ethernet frame which is formed by the baseband signal and a control word and processed through an Ethernet physical layer to opposite equipment; and acquiring data from corresponding Ethernet frame positions in the opposite equipment, restoring into the baseband signal, and meanwhile solving the control word to maintain a network ofthis level. In the invention, a multiframe structure is utilized to realize signal transmission and different requirements on bandwidths can be satisfied; the control word is defined in the multiframe, and the use of the control word can enrich network modes of a system level and greatly facilitate the maintenance of the whole network.

The invention discloses a feedback prediction controlling method of self-adaptation condition based on noise estimation, which comprises the following steps: A. utilizing Singular Pencil Model to represent real controlled course; B. adopting recurrence expanded Kalman filter parameter estimation method to estimate the real controlled condition and model reference through Singular Pencil Model; C. utilizing the estimated condition and model parameter to calculate the present control action; adding the calculated control action into the controlled course; D. repeating the step B and C in the next executing period; realizing the feedback prediction controlling method of self-adaptation condition in the real controlled course. The invention improves the noise inhibiting ability through controlling method greatly, which reduces the calculating quantity for industrial application conveniently.

The method includes following steps: first, carrying out wavelet transform for source signal in frequency sweep so as to obtain its expression in time frequency; carrying out wavelet transform for received signal so as to obtain its expression in time frequency; then, carrying out cross correlation between their expressions in time frequency; carrying out detection and time delay estimation for echo in the received signal so as to obtain detected pulses; calculating distance of corresponding target based on each position of detected pulse. Possessing high capability for suppressing noise, and for adapting waveform distortion in echo, the invention can detect econ in weak energy. The invention is especially suitable to echo detection in condition of large environmental noise, long propagation distance and high attenuation of energy.

The invention discloses a three-dimensional small-angle measuring device and a three-dimensional small-angle measuring method. The three-dimensional small-angle measuring device comprises a laser, a beam expander, a beam splitter, a measuring camera, a rectangular square pyramid reflector and a data processing computer, wherein a planar reflector is arranged between the beam expander and the beam splitter, the beam splitter is positioned between the measuring camera and a light path of the rectangular square pyramid reflector, laser emitted by the laser is expanded through the beam expander, enters the rectangular square pyramid reflector through the planar reflector and the beam splitter, then returns the beam splitter after being reflected by the rectangular square pyramid reflector, and enters the measuring camera; the data processing computer is connected with the measuring camera. The invention also discloses a method for measuring the three-dimensional small-angle change amount by using the three-dimensional small-angle measuring device further comprises the steps of establishing a coordinate system; acquiring position data of the center of mass of a lasing image spot; and solving the angle. The three-dimensional small-angle measuring device is high in accuracy and measurement resolution ratio due to the adoption of a non-contact optical small-angle precision measurement technology. Compared with a conventional method, the three-dimensional small-angle measuring method has the advantages that the small change amount of a rolling angle can be distinguished, and the spatial three-dimensional small-angle measurement is realized.

The invention relates to an image noise suppression method for laser active imaging, and belongs to an image noise suppression method. Structural elements of different scales are used to carry out morphological opening-closing operation and morphological closing-opening operation on an image formed by laser active imaging, and the results of multi-scale morphological filtering are fused according to the homogeneity of the local areas of the image. Multi-scale morphological image de-noising refers to weighted averaging of the morphological filtering results of the structural elements of all scales. Based on a morphological filtering method, a hardware logic structure is easy to implement. The image edge can be processed in real time and maintained properly. By using structural elements of multiple scales in morphological filtering and de-noising and taking the homogeneity of the local areas of the image as the basis for the fusion of results of image filtering by structural elements of different scales, a better laser image de-noising effect can be obtained. The method can be applied to laser active imaging systems, synthetic aperture radars, infrared medical imaging and other image de-noising occasions with speckle noise.

The invention discloses a power transmission wire operation state monitoring method and device, and the method comprises the steps: obtaining a vibration video of a power transmission wire in a reference state, and extracting the vibration characteristics of the power transmission wire in the reference state; analyzing the vibration characteristics in the reference state to obtain the first two-order modal frequency of the reference; acquiring a vibration video of the power transmission wire in an operation state, and extracting vibration characteristics of the power transmission wire in the operation state; analyzing the vibration characteristics in the running state to obtain a second-order modal frequency before running; and comparing the first two-order modal frequency of the referencewith the second-order modal frequency before operation. The method for monitoring the running state of the power transmission wire provided by the invention is simple in structure, high in operability and high in precision, the industrial camera is used for obtaining video information of the benchmark and the running state of the power transmission wire in a non-contact mode, the video information in the benchmark and the video information in the running state are analyzed respectively, noise reduction is conducted, unimportant features are removed, and therefore the monitoring precision is improved.

The invention discloses a wireless transmitter. The transmitter comprises a transmitting antenna, a to-be-transmitted signal input module and a cascaded primary phase-locked loop and a cascaded emitting stage phase locked loop. The input end of the primary phase-locked loop is connected to an external crystal oscillator, and the emitting stage phase-locked loop is respectively connected to the transmitting antenna and the to-be-transmitted signal input module. The invention also provides a wireless communication chip applying the above wireless transmitter. Through the cascaded primary phase-locked loop and the transmitter stage phase-locked loop, a single-point modulation mode is adopted to overcome the contradiction between communication speed, PLL bandwidth and noise suppression of a PLL-based directly modulated wireless transmitter, and effects of the noise suppression are improved while expanding phase-locked bandwidth to improve the communication speed.

The invention discloses a noise image classification method based on an l2p norm robust least square method. The method comprises the steps of firstly carrying out the initialization of parameters, solving a target function of the robust least square method based on L2 and p norms through an alternating optimization method, obtaining a final classification model, and achieving the classification of noise images. According to the method, the noise and the outliers in the sample are automatically removed by adding the weights to the data points in the training set, manual error threshold selection is not needed, only the number of the noise points needs to be estimated in advance, the process is simple, the calculation amount is small, the noise image is removed while the classifier is trained, and the noise suppression capability and the image classification precision of the least square method are improved.

The invention provides a control method based on a combination of combined integral controllers and a dual control system. The dual control system comprises a main control object, an auxiliary control object, a main controller for controlling the main control object and an auxiliary controller for controlling the auxiliary control object, wherein both the main controller and the auxiliary controller adopt the combined integral controllers. The combined integral controllers are applied to a quick response circuit and a slow response circuit of the dual control system and replace the originally-used traditional PID controllers, system steady state errors, overshoot and steady state reaching time are thus reduced, and the robust performance of the system is enhanced. The combined integral controllers and the dual control system are combined for use, and the filter function of the combined integral controller enhances the system noise suppression ability. The system can reach the steady value, the response speed is quick, the overshoot is small, and no steady state errors exist almost. After the system output reaches a steady value finally, when interference is added, the system can be quickly restored to the original steady state, and the robust performance is good.

The invention discloses a fracture-cave development zone detection method based on iterated three-parameter wavelet transformation. The fracture-cave development zone detection method comprises the steps that calculation is conducted by replacing conventional wavelet transformation with three-parameter wavelet transformation, edge detection is conducted in the transverse direction and in the longitudinal direction of a two-dimensional earthquake slice at the same time, a root mean square of a transverse edge detection result and a longitudinal edge detection result is used as the final edge detection result, then wavelet transformation is conducted twice, edge-preserving smoothing is conducted on a result array of wavelet transformation, a final result array used for edge detection is obtained, and the result array is used for describing the development zone of a fracture-cave body. According to the fracture-cave development zone detection method based on iterated three-parameter wavelet transformation, calculation is conducted by replacing conventional wavelet transformation with three-parameter wavelet transformation, the defect that the seismic data matching performance is poor in the prior art is overcome, and the edge detection precision is improved.

The invention discloses a multi-layer stack type EEBG structure which comprises at least one unit element. Each unit element comprises a flat metal plate and at least one stack type EEBG; the stack type EEBG is arranged between a power supply layer and a grounding layer of the flat metal plate; the stack type EEBG comprises a first EEBG and a second EEBG; the first EEBG is connected with the power supply layer; and the second EEBG is arranged between the first EEBG and the power supply layer, and penetrates through the first EEBG to be connected with the grounding layer. Through the mode, a capacitance can be increased by utilizing EBG configuration of different sizes and a multi-layer stack, a low-impedance surface can be formed, a noise source can be smoothly conducted to enter a GND grounding layer, a noise generated by the power supply can be obviously reduced, a bandwidth can be increased, and a cut-off depth and a center frequency can also move to high frequencies.

The invention relates to the field of vector hydrophones, anti-magnetic levitation and eddy current sensors, in particular to a magnetic suspension two-dimensional displacement vector hydrophone. Thehydrophone comprises an outer shell part, an inner cylindrical shell part and an interlayer part, wherein the shell part is a cube with reserved holes in the periphery of the side surface and completeupper and lower surfaces; the internal cylindrical shell part is made of a non-magnetic metal material and is arranged at the geometric center in the outer shell part, and the circumference of the side surface of the internal cylindrical shell part is not tangent to the outer shell part but a certain gap is reserved therebetween; the interlayer part is located between the outer shell part and theinner cylindrical shell part. According to the invention, the measurement dimension can be increased, the sensitivity is increased, the suspension of the traditional vector hydrophone is improved, and the vector hydrophone has the advantages of high installation stability, small size, high low-frequency and very-low-frequency sensitivity and the like.