313results about How to "Suppression of interfering signals" patented technology

The present invention relates to a method and apparatus for improving interference suppression processing and control in hearing aids communicating with a mobile station over a short-range wireless network. The hearing aid includes an acoustic echo canceller to suppress acoustic echo from the input audio signals. The mobile station also includes an echo canceller, and may include one or more switching circuits to bypass the echo canceller when the mobile station communicates with the hearing aid via the short-range wireless network. Typically, when the short-range wireless network between the hearing aid and the mobile station is established, the hearing aid and the mobile station negotiate one or more short-range wireless network profiles to determine the properties of the echo cancellers.

The invention discloses a visual detection method of shockproof hammer defect detection. The visual detection method comprises the steps that denoising and anti-shaking preprocessing is performed on an aerial photographing image so as to obtain an original image to be detected; the existing original image is expanded by using the method of geometric transformation, scale change and contrast transformation so as to generate more data similar to the original image; samples are acquired, a shockproof hammer in the aerial photographing image is acquired and the size of the shockproof hammer is mainly acquired; a network model to be trained is determined, and the sample data are inputted to perform forward propagation and reverse propagation to adjust the weight so as to obtain the optimized detection network model parameters; the image to be detected is identified by using the trained model and the position of the hammer of the shockproof hammer is determined; and the lead in which the hammer is located is determined, and shockproof hammer defect discrimination is performed according to the relative position of the lead and the shockproof hammer and the constraints of respective directions.

The invention designs a method for monitoring an oil well fracturing microseismic ground-borehole crack, which is characterized by comprising the following steps of: receiving microseismic waves by monitoring substations arranged at the circumference of a wellhead by utilizing the propagation characteristic of an elastic wave field in a stratum medium, forming a series of equation sets according to the arrival time difference of the microseismic waves of each substation, and solving the series of equation sets to determine the position of a microseismic source and further determine stratum parameters of crack distribution, such as the azimuth, the length, the height, the ground stress direction and the like. The background noise in a well is small, filtration processing is carried out on a ground observation signal through an underground observation signal, fracturing microseismic signals and ground interferences are screened and distinguished, a detector placed in the well is a reference value of a whole set of system collected signals, the signal collected by a ground seismometer is identified by people through the reference value to filter an interference signal, so that a monitored result of the people can be more true and reliable.

The invention discloses an online fault monitoring device for a cable connector in a 10-35kV power distribution network. The online fault monitoring device comprises two current sensors, a difference module, an A/D convertor, a lower computer and a power supply module, wherein the two current sensors are mounted at the two ends of the cable connector in the 10-35 kV power distribution network; pulse current signals received by the current sensors are processed by the difference module to obtain induced voltage signals at the two ends of the cable connector, the induced voltage signals are converted into digital signals through the A/D convertor, and the digital signals are processed by the lower computer to obtain the insulation condition data of the cable connector. The invention further discloses a method for evaluating the system state of the online fault monitoring device for the cable connector in the 10-35kV power distribution network. The method adopts two rogowski coils for high-frequency electromagnetic coupling to respectively collect partial discharge pulse signals, so that the possibility of difference processing on the partial discharge signals of the cable connector is provided. After the signals are subjected to the difference processing, the partial discharge pulse signals can be amplified without distortion, interference signals from the outside can be effectively shielded, and the field interference is effectively restrained.

A combined SAIC receiver and a multiple-antenna, receive diversity receiver are employed to reduce interference in a wireless system. The real and imaginary parts of the de-rotated signal for each receive path associated with an antenna are separately filtered and a combined output signal of all receive paths is generated. The weighting coefficients are adjusted based on an error signal produced by comparing the combined output signal with a reference signal. The weighting coefficients are initially set based on an MMSE/LS type of signal processing criteria, where the reference signal is the Training Sequence Code (TSC). Subsequent adjustment/tracking can be accomplished by using known tracking algorithms, e.g. LMS or RLS, or the coefficients can be re-computed using MMSE/LS processing. The reference signal for tracking may be a combination of the TSC and estimated data symbols provided by an equalizer.

The invention relates to the field of traffic rails and specifically relates to a method and a system for testing dynamic stiffness. The method for testing the dynamic stiffness includes that a force in a preset frequency range is applied to a rail in preset time to enable the rail to produce vibration; force signals and vibratory acceleration signals are real-timely acquired according to a preset sampling frequency; data of the force F, time corresponding to the force F, data of an acceleration a and time corresponding to the acceleration a are recorded according to preset time intervals, the acquired force signals and the acquired acceleration signals; a corresponding relation of a displacement X and the frequency f is obtained according to the corresponding relation of the data of the acceleration a and the time corresponding to the acceleration a; the corresponding relation of the displacement X and the time t is obtained; and the corresponding relation of the dynamic stiffness Z and the frequency f is obtained according to the corresponding relations and the corresponding relation of the dynamic stiffness, the displacement and the force, and namely, wide frequency dynamic stiffness is obtained. By means of the method and the system for testing the dynamic stiffness, the wide frequency dynamic stiffness of the rail can be tested.

The invention relates to an ultrasonic transit time test method based on synthesis aperture focus in the field of the ultrasonic wave nondestructive inspection of the panel and brazing seam fault. It uses the ultrasonic transit time to obtain the initial B scan image, dose linear process to B scan image and establishes the ultrasonic transit time method B scan image reconstruction math model based on synthesis aperture focus according to the forming course of the B scan image and the geometry relation of the probe and the fault location, at last it achieves the linear-synthesis aperture focus (L-SAFT) reconstruction of the image.

The present invention relates to a radar sensor which is used for detecting the surrounding traffic environment in motor vehicle (18). The radar sensor comprises an adjustable transmitting amplifier and/or a receiving amplifier (22, 30) and an adjusting device (34) which is used for adjusting a transmitting gain and/or receiving gain. The invention is characterized in that an evaluating device (32) is designed for continuously evaluating the surrounding traffic environment and exerting effect to the adjusting device (34) according to the current evaluation.

Unwanted signal components in time-division multiplexed (TDM) systems may lead to crosstalk and noise if these pulses overlap with signal pulses from an interrogated sensor. The crosstalk and noise are dominated by interference between the signal pulses from the interrogated sensor and the unwanted signal components and can be greatly reduced by suppressing this interference signal. The unwanted signal components may include overlapping pulses originating from different sets of interrogation pulses (repetition periods). Modulating the phase or frequency between the repetition periods so that the unwanted interference signal does not appear at frequencies from which the phase of the interrogated sensor is demodulated suppresses this interference. Other unwanted signal components include leakage light during dark periods of the duty cycle of an interrogation signal. Modulating the phase difference between the interrogation signal and the leakage light suppresses the interference between the leakage light and the interrogation signal.

The invention provides a high-frequency-selectivity radio-frequency front end suitable for nano-scale. The front end comprises a high-frequency input matching network, a lower-noise transconductor, a load network and a passive frequency mixer, wherein the passive frequency mixer is arranged on an output node of the input matching network or the low-noise transconductor or the load network; impedance conversion is adopted by the input matching network and the load network to realize high Q values and high frequency selectivity for filtering out-of-band interference; a radio-frequency signal is filtered by using the high-Q-value input matching network, and is then amplified by using the transconductor and the load of the high-Q-value load network which is subjected impedance conversion; a high-frequency signal is converted to a low-frequency signal by performing down-conversion with the passive frequency mixer for processing with an analog or digital baseband. The radio-frequency front end has the advantages of low power consumption, high image rejection ratio, high out-of-band linearity, strong gain configurability, no need of off-chip SAW (Surface Acoustic Wave) filter and the like, and is suitable for application to a future multifunctional integrated radio-frequency chip.

The invention relates to a silicon micro angular vibration output gyroscope composed of an upper layer and a lower layer. The upper layer is a gyroscope mechanical structure arranged on a monocrystalline silicon wafer. The lower layer comprises signal leads arranged on a glass substrate. The upper mechanical structure is composed of two similar-structured substructures, wherein the substructures are symmetrically arranged left and right, and the substructures are connected through a mass block connecting mechanism. The two substructures are respectively connected to crossbeams, which are connected to fixed pedestals through horizontal torsion bars. The fixed pedestals are arranged on fixed pedestal bonding sites on the glass substrate. Therefore, the upper mechanical structure is suspended above the lower glass substrate. The signal leads and the bonding sites are arranged on the lower glass substrate. According to the invention, with the horizontal torsion bar and the crossbeams, the gyroscope rotates around the z axis. Therefore, sensitive motion of the gyroscope is realized; motion decoupling of a driving direction and a detection direction is realized; the number of interference modes is reduced; requirement to processing precision is reduced; and sensitivity of the gyroscope is improved.

The invention discloses a sound identification method based on a cross acoustic array broadband wave beam formation. The sound identification method comprises steps of using a cross acoustic array to align with a needed direction to collect acoustic signals, 2, performing pre-processing on collected sound, 3, performing DFT (discrete Fourier transform) on processed data of each frame, performing frequency band extraction according to a needed frequency band, 4, performing LSMI-MVDR wave beam formation on the needed direction by the extracted frequency band, 5, performing inverse DFT on a frequency domain signal after the wave beam is formed, 6, performing frame overlapping synthesis according to the framing principle to output a signal, and 7, performing characteristic extraction and classification study and identification. The sound identification method based on cross acoustic array broadband wave beam formation can improve a signal-to-noise ratio of the signal received in an expected direction, inhibits interference signals of other directions, can be applied to a signal processing process of an acoustic identification system and can effectively improve an identification rate and reliability of the identification system on the identification object.

The invention relates to electric toll road side equipment based on the intelligent antenna technology, which comprises a receiving antenna array, a sending antenna array, a sending module, a digital receiving array module, a signal processing and control module and a frequency source module, wherein each array element of the receiving antenna array is respectively connected with respective receiving channel; the digital receiving array module integrates a plurality of receiving channels respectively connected with the array elements of the receiving antenna array; and the signal processing and control module is used for processing multi-channel receiving signals of the digital receiving array module, so as to confirm the positions of the communication vehicles and suppress disturbing signals. The road side equipment utilizes the digital receiving array and acquires the multi-channel receiving signals; and the positions of the communication vehicles can be accurately confirmed through methods, such as digital beam forming and wideband arrival direction estimation. The road side equipment can be widely used in the fields of road electric charge systems, automatic vehicle identification, vehicle in-out management, city road charge, and the like.

The invention discloses a multi-channel laser fuse for all-direction detection. The laser fuse comprises a laser transmitter, a laser receiver and a signal processing unit, wherein the laser transmitter is used for transmitting detecting laser beams to a to-be-detected target; the laser receiver is used for receiving echo of the to-be-detected target and the echo of interference; the signal processing unit is respectively connected with the laser transmitter and the laser receiver, is used for generating a laser beam transmission standard time sequence so as to control the laser transmitter to transmit the detecting laser beams, and is also used for analyzing the echoes, received by the laser receiver, of the to-be-detected target and the interference so as to identify the to-be-detected target and realize environmental interference prevention and ultralow-altitude sea clutter interference prevention. The invention also discloses a method for detecting a target by adopting the laser fuse. The laser fuse and the method disclosed by the invention has the advantages of realizing large-view-field all-direction detection and being long in action distance, high in spot resistance and environmental interference resistance and applicable to the ultralow altitude field.

The invention provides a polarization suppression processing method for radar mainlobe interference. The technical scheme is that: the method comprises the following five steps of: 1, constructing a function base relevant to a radar antenna polarization characteristic; 2, preprocessing an interference and target mixed signal; 3, performing orthogonal polarization decomposition processing on the interference and target mixed signal; 4, performing polarization filter vector estimation on the interference and target mixed signal; and 5, performing space domain multi-concave polarization filter on the interference and target mixed signal. A voltage matrix of the interference and target mixed signal is processed by using a least square algorithm, so that orthogonal polarization decomposition and estimation for the interference and target mixed signal are realized; and under the condition that a pitching angle cannot be acquired precisely, an interference signal is suppressed by using a space domain multi-concave virtual polarization filter. The polarization suppression processing method has no extra requirement on a hardware system, is easy to implement, and is high in engineering applicability.

The invention discloses a submatrix level linear constraint self-adaptive beam forming method based on feature subspaces, and belongs to the technical field of array signal processing. The method includes the steps that eigenvalue decomposition is conducted on a sampling covariance matrix, so that the needed interference subspaces are estimated, then, interference signals are restrained in a self-adaptive mode by the way that interference subspace constraint beam response is zero, a self-adaptive directional diagram is constrained by introducing a penalty function, so that a main lobe achieves shape preserving, and a side lobe is lowered. According to the method, self-adaptive interference restraint is carried out, meanwhile main lobe shape preserving and side lobe lowering of the self-adaptive directional diagram obtained in a submatrix are achieved, and good output SINR performance can be obtained. The method is suitable for submatrix level linear constraint self-adaptive beam forming.

The invention particularly discloses a design method for a self-adaptation optimal phase angle notch filter. The design method is used for restraining narrow-band signal interference on unknown frequency bands so that a system can have the characteristic of offsetting wide-band random interference signals on a low-frequency band. According to the design method, a system loop module comprises an object model module, a robust controller module and a self-adaptation optimal phase angle notch filter module. The design method comprises the specific steps that (1) object model discretization is established; (2) a robust controller is designed; (3) an optimal phase angle notch filter is designed and is connected to part of a system loop; (4) according to a P(s) C(s) transfer function, an improved minimum mean square value self-adaptation algorithm is adopted, H8 mixing sensitivity control is introduced to design the robust controller, so that a notch center frequency tracks an unknown single-frequency interference frequency, and optimal restraint of the random interference signals and unknown single-frequency interference signals is achieved; meanwhile, multi-source interference signals including the wideband random interference signals, the unknown single-frequency interference signals with a plurality of frequencies and the like can be restrained at the same time.

The invention discloses an interference suppression method for a multi-user MIMO collaborative relay system, mainly solving the problem that each user has multiple antennas in a common-channel multi-user relay system. The interference suppression method comprises the steps that: a user determines a beamforming vector by adopting a signal space alignment method, and sends out a signal after weighting the signal with the beamforming vector in a multiple-access time slot; a relay constructs a precoding matrix based on an orthogonal projection principle, and amplifies and sends the received signal after precoding; the user receives the signal and suppresses interference signals between user pairs by adopting a decoding vector, and conducts a maximum likelihood detection to obtain the needed signal. According to the invention, a network transmission rate and a resource utilization rate are improved, diversity gains of multiple antennas are achieved, channel fading resisting capability of the system is enhanced, and a bit error ratio is decreased. Further, the interference suppression method of the invention can be applied in a transmission mode under centralized management and control of a wireless ad hoc network and base station, wherein data can be exchanged directly through user-relay-user mode.

The present invention provides a low phase noise wideband microwave local oscillator source circuit which is formed by two phase-locked loops. The frequency division signal of a broadband voltage-controlled oscillator directly enters a phase detector to form phase-locked loops with a reference signal, and the preset of the whole loop is realized. Then through switch switching, the output signal of the voltage-controlled oscillator and the frequency doubling and frequency division of a sampling ring output signal are mixed, the phase locking is carried out again, and the function of a low noise is realized. According to the low phase noise wideband microwave local oscillator source circuit, a wideband VCO chip is used, the outputted frequency range is 3GHz to 10GHz, and the phase noise of a 10GHz signal can reach -120dBc/Hz@10kHz. According to the low phase noise wideband microwave local oscillator source circuit, while very low phase noise is obtained, the number of used devices is greatly reduced, a PCB space is saved, the volume is only 16cm by 9cm by 2cm, the debugging difficulty is reduced, and the power consumption is reduced.

The invention discloses a double hot spare type automatic passing phase separating device, comprising a signal processor, a signal receiver and signal indicator boards. The signal processor is internally provided with a circuit connecting base board and two main control circuit boards; the circuit connecting base board and the two main control circuit boards are respectively connected by a circuit; the front end of the signal processor is provided with two displaying and operating panels, which are respectively connected with the two main control circuit boards by the circuit; the rear end of the signal processor is provided with a connecting socket which is connected with the outside and is connected with the signal processor; and the number of the signal indicator boards is two and the two signal indicator boards are respectively arranged at two driver positions and are connected with the signal processor after being connected in parallel. The double hot spare type automatic passing phase separating device is applicable to automatic control field of high-speed motor train units and electrical locomotives of electric railways, actually realizes reliable and safe automatic passing phase separating of high motor train units and electrical locomotives and guarantees the safe operation of the high-speed electric railways.

The application provides a lightning arrester test method and a lightning arrester test system. The method comprises the following steps: getting multiple pieces of sampling data of the full current of a lightning arrester; filtering out interference signals in the multiple pieces of sampling data of the full current to get multiple filtered output currents; calculating out a resistive current fundamental component and a third-harmonic component according to the multiple filtered output currents; and calculating out the internal status indicators of the lightning arrester according to the resistive current fundamental component and the third-harmonic component. For charged test of the lightning arrester using the method, neither complex circuit nor voltage measurement is needed, and the operation is simple. Moreover, the temperature factor is considered in calculation of the internal status indicators of the lightning arrester, so test is no longer affected by ambient temperature. The problem that lightning arrester test is complex in operation and is affected by temperature is solved.

The invention provides a united anti-interference method based on array antennas and a GPS/SINS. The method includes the steps that after the position and the posture of a carrier are initialized, a GPS/SINS integrated navigation state equation and a measurement equation are built; the position and the posture of the carrier are provided in real time through GPS/SINS integrated navigation, and the current position of a satellite is calculated according to satellite ephemeris information to obtain a guiding vector from the satellite to the carrier; the guiding vector serves as prior information of a multi-constraint minimum variance space-time self-adaptive processing algorithm and suppresses broadband interference and narrow-band interference in a space domain and a time domain at the same time. According to the united anti-interference method, wave beams can be formed in the direction of a plurality of visual satellites at the same time, and null steering is formed in the interference direction, so that interference signals are suppressed while satellite signals are enhanced. An antenna array of a round structure is adopted, the position and the posture of the carrier are provided for forming the wave beams of the array antennas through GPS/SINS integrated navigation, the position of satellite is provided by the adoption of a satellite ephemeris, and therefore the prior information is provided for forming the wave beams.