36results about How to "Improve signal detection accuracy" patented technology

A signal detection apparatus improving signal detection accuracy in a receiver for communications system complying with the MIMO scheme. The signal detection apparatus detects transmission signals sent from transmission antennas based on received signals received by receiving antennas. The apparatus includes: a first determination mechanism for determining symbol candidates of the transmission signals in sequence based on the QRM-MLD method using the received signals arranged in first order; a second determination mechanism for determining symbol candidates of the transmission signals in sequence based on the QRM-MLD method using the received signals arranged in second order that is different from the first order; and an output mechanism for outputting symbol candidates and likelihood of the transmission signals based on determination results of at least the first and the second determination mechanisms.

The invention relates to an intelligent household health management device. The intelligent household health management device comprises a health information collection device, a health information analysis circuit, a seat for bearing a person and armrests on the two sides of the seat, wherein the health information collection device is electrically connected to the health information analysis circuit. The intelligent household health management device is characterized in that the health information analysis circuit comprises a bioelectricity detection module and a body impedance detection module, the health information collection device comprises a collection electrode and a signal switchover switch, the collection electrode is connected with the bioelectricity detection module and the body impedance detection module through the signal switchover switch, the signal switchover switch comprises a shell, a mobile contact, a static contact and an electromagnetic push rod, the mobile contact is installed on a movable rod of the electromagnetic push rod, and an electromagnet of the electromagnetic push rod is far away from the mobile contact and the static contact. The intelligent household health management device has the advantage of high detection precision.

The invention relates to a bus network simulation detection test bench which comprises a computer and an external signal port (500). The computer comprises a computer host machine (81) and a USB expansion port (17). The external signal port (500) comprises a serial communication interface. The computer host machine (81) comprises a computer program for simulating a bus actual network. The computer host machine (81) is connected to the serial communication interface which is connected to the USB expansion port (17). The computer program comprises the working state code of bus borne equipment. Compared with the prior art, the bus network simulation detection test bench has the advantages that a bus network environment is simulated through the computer, thus an existing technical scheme of actually connecting network equipment to be repaired or tested to bus electrical equipment to carry out repairing or detecting work is substituted, the safety risk of using an actual bus to repair or detect the network equipment is eliminated completely, and the maintenance and test ability and work efficiency are greatly improved.

The invention discloses a touch display panel, a driving method and a touch display device. The touch display panel comprises a shift circuit, a control signal line, a control circuit, multiple scanning lines, multiple data lines, multiple touch driving electrodes, a switching control signal end and a switching control switch unit. During a touch period of a frame cycle, all switching control switches are switched on under the control of a first control signal output by the switching control signal end, so that all the touch driving electrodes are electrically connected with at least one data line through at least one switching control switch; the control circuit enables the scanning lines to be suspended based on the first control signal output by the switching control signal end and a signal at the output end of the shift circuit. Through the touch display panel, coupling between devices on the touch display panel is lowered, stray capacitance between the scanning lines and other devices is eliminated, and the signal detection precision of the touch display panel is improved.

The invention discloses an amplitude equalization circuit for a mobile underwater sound frequency-hopping communication receiving system, and relates to a frequency-hopping communication system. The circuit is provided with an impedance transformation circuit, an automatic gain control circuit, and a bandpass filter. The input end of the impedance transformation circuit is externally connected with an energy converter, and the automatic gain control circuit is provided with a primary amplification circuit, a secondary amplification circuit, and a feedback control circuit. The input end of the primary amplification circuit is connected with the output end of the impedance transformation circuit, and the output end of the secondary amplification circuit is connected with the input end of the bandpass filter. The output end of the bandpass filter is connected with the input end of the secondary amplification circuit, and the output end of the secondary amplification circuit is connected with the input end of the feedback control circuit. A control signal output end of the feedback control circuit is connected with the primary amplification circuit, and the output end of the secondary amplification circuit is externally connected with a subsequent circuit. The circuit can effectively reduce the size of the range of an amplitude change, caused by frequency change, of an echo signal of a receiving end, reduces the operation amount of a system, and improves the detection accuracy.

A transmitting device Fourier-transforms symbols in a transmission symbol sequence, maps the Fourier-transformed symbols to subcarriers, inverse-Fourier-transforms the mapped symbols, and transmits the inverse-Fourier-transformed symbols from multiple transmitting antennas. A receiving device Fourier-transforms received signals, extracts signal components mapped to the subcarriers, and estimates the symbols transmitted via the subcarriers by applying a QR decomposition algorithm to the extracted signal components. The receiving device obtains a unitary matrix QH such that the product of the unitary matrix QH, a weight matrix W determining a correspondence between the transmission symbol sequence and the subcarriers, and a channel matrix H becomes a triangular matrix R, and estimates candidates of the symbols transmitted from the transmitting antennas based on the unitary matrix QH and the triangular matrix R.

The invention relates to an induction type non-magnetism remote water gauge which comprises a base gauge and a signal processing device arranged on glass on the surface of the base gauge. The signal processing device comprises a signal collecting sensing coil and a signal processing circuit. The signal collecting sensing coil comprises an outer inductance coil and four inner inductance coils distributed in the outer inductance coil according to the cross-shaped quadrants. A stainless steel sheet is arranged at the position, corresponding to the signal collecting sensing coil, of the base gaugeand is in an 8 shape. The 8-shaped stainless steel sheet rotates along with a rotating shaft of the base gauge and shields the inner inductance coils according to opposite angles so as to change themagnetic flux of the inner inductance coils. The signal processing circuit conducts continuous sampling and processing on the inner inductance coils. The water gauge does not internally contain a permanent magnet and other magnetic elements, is little affected by inner magnetic force and outer magnetic force, and is far in detection distance and precise in measurement.

This weak signal detection system has: a statistical data acquisition unit which measures the average value or distribution of an input signal in which is noise superimposed on a desired signal, calculates parameters such as the amplitude or noise dispersion of the desired signal, and outputs the calculated data obtained thereby; a nonlinear characteristic unit which outputs a signal having a nonlinear response with respect to the magnitude of the voltage or the current of the input signal; a signal detection ratio evaluation unit which determines whether the output signal from the nonlinear characteristic unit is the desired signal, calculates the detection ratio in the event that the signal is the desired signal, and outputs detection ratio data; a parameter adjustment unit which, on the basis of detection ratio data obtained by the signal detection ratio evaluation unit and calculated data obtained by the statistical data acquisition unit, adjusts a control parameter pertaining to the responsiveness of the nonlinear characteristic unit; and a signal processing unit which performs signal processing of the output signal of the nonlinear characteristic unit, and conversion to digital data or image data. In so doing, it is possible to provide a weak signal detection system having improved signal detection accuracy, and an electron microscope equipped with the system.

The invention discloses an ion chromatography digital conductance detecting device based on a digital signal processor (DSP). The ion chromatography digital conductance detecting device comprises a digital conductance detector circuit board and a conductance detecting pond. Traditional thought of the ion chromatography digital conductance detecting device is abandoned from a measuring circuit and signal processing, digital programmable sine alternating current exciting signals are generated through the DSP and exerted on a conductance sensor, and electrode voltage and current are detected through I / V current detecting based on a microcurrent operational amplifier and a differential voltage detecting method with buffering input. By means of direct alternating current synchronous sampling, conductance signals are extracted out through a digital sine phase sensibility demodulation method through the DSP. In addition, real-time conductance rate of a solution can be output after temperature compensation. The ion chromatography digital conductance detecting device effectively improves flexibility and precision of ion chromatography conductance detecting, increases detecting range of the ion chromatography digital conductance detecting device, and reduces system noise and baseline drift.

A transmitter in a mobile communication system code-multiplexes transmission symbols together with spreading codes, performs inverse Fourier transform and transmits the result from multiple transmit antennas. A receiver in the mobile communication system performs Fourier transform on signals received at multiple receive antennas, extracts signal components of individual subcarriers and estimates symbols in accordance with a QR decomposition algorithm. A unitary matrix is derived such that a product of a spreading matrix including spreading elements as its elements and a channel matrix representing radio channel states is equal to a product of the unitary matrix and a triangular matrix. A reception vector, a unitary matrix and a triangular matrix are used to estimate symbol candidates transmitted from individual transmit antennas.

This weak signal detection system has: a statistical data acquisition unit which measures the average value or distribution of an input signal in which is noise superimposed on a desired signal, calculates parameters such as the amplitude or noise dispersion of the desired signal, and outputs the calculated data obtained thereby; a nonlinear characteristic unit which outputs a signal having a nonlinear response with respect to the magnitude of the voltage or the current of the input signal; a signal detection ratio evaluation unit which determines whether the output signal from the nonlinear characteristic unit is the desired signal, calculates the detection ratio in the event that the signal is the desired signal, and outputs detection ratio data; a parameter adjustment unit which, on the basis of detection ratio data obtained by the signal detection ratio evaluation unit and calculated data obtained by the statistical data acquisition unit, adjusts a control parameter pertaining to the responsiveness of the nonlinear characteristic unit; and a signal processing unit which performs signal processing of the output signal of the nonlinear characteristic unit, and conversion to digital data or image data. In so doing, it is possible to provide a weak signal detection system having improved signal detection accuracy, and an electron microscope equipped with the system.

The invention discloses a Beidou navigation self-optimizing device and a self-optimizing method of the Beidou navigation self-optimizing device, wherein the self-optimizing device comprises a Beidou navigation positioning terminal and a Beidou positioning platform in mutual communication, the Beidou navigation positioning terminal comprises a multisystem type signal receiving detection system and an information receiving and self-optimizing system, and the Beidou positioning platform comprises a Beidou signal information obtaining and processing system, a statistic algorithm and inquiry system and an information feedback system. The Beidou navigation self-optimizing device and the self-optimizing method have the advantages that the detection capability of the positioning platform on Beidou signals of the Beidou navigation positioning terminal can be improved, in addition, the regional statistics can be carried out by combining the geographical position and the Beidou signal intensity, the self-optimization of the Beidou navigation positioning terminal can be realized through signal detection and information feedback, the requirement on Beidou satellite signals is reduced, the terminal fitness is improved, and the geographic position information continuity and the signal detection precision under the condition of unstable Beidou signals are enhanced.

The invention provides a differential MEMS gas sensor. The sensor is internally provided with two chamber groups with cavity space in mirror symmetry and arranged on the same layer, and each chamber group comprises a gas chamber cavity and a sound chamber cavity which are communicated with each other in an intersecting manner; a microphone for detecting sound signals is arranged in each sound chamber cavity; each chamber group is communicated with the atmosphere outside the differential MEMS gas sensor only through a plurality of air holes formed in the top chamber wall of the gas chamber cavity; and the gas chamber cavity of one chamber group is further provided with a laser assembly, and laser generated by the laser assembly can be shot into the gas chamber cavity. A double-gas-chamber differential design is adopted, the influence of environmental noise on measurement is greatly reduced, the precision is high, and the size is small.

The invention discloses an electromagnetic spectrum monitoring receiver signal automatic detection method, which comprises the steps of signal enhancement representation and ensemble learning discrimination, wherein the signal enhancement representation is used for solving a local mean difference, a local median difference and a local morphological processing difference of a spectrum of each signal under different scales, and then an enhanced representation matrix is formed; and the integrated learning discrimination comprises branch detector learning and integrated detector learning, and is implemented by forming a signal detection training sample set by using the enhanced representation matrix of a plurality of signals at first, allocating sample subsets to train branch detectors and recording a detection result, then constructing an ensemble learning training sample set by using a detection result and training an ensemble detector, and after training of the integrated detector is completed, the branch detectors and the ensemble detector are combined, and the ensemble detector outputs a final automatic signal detection result. The electromagnetic spectrum monitoring receiver signal automatic detection method has relatively high signal characterization capability and signal identification capability, so that good signal detection accuracy and stability can be realized.

In a foreign matter inspection apparatus for a semiconductor wafer, a PMT which detects reflection light, an amplifier which amplifies a signal detected by the PMT and in which response characteristics of amplification are controlled by a control signal, an A / D converter which converts the signal amplified by the amplifier into a predetermined code and outputs the code, a control circuit which generates a control signal based on information of the semiconductor wafer having a correlation with the reflection light, and a data processing circuit which detects a foreign matter on the semiconductor wafer based on the code output from the A / D converter are provided.

The invention discloses an angle-based adjusting device, a sensor module and a cleaning robot. The adjusting device is used for adjusting the detection angles of sensors to be assembled, and comprisesa bottom shell inside which demising slots are formed and adjusting mechanisms, wherein demising openings for supporting the movement of the sensors to be assembled are reserved in the demising slotsof the bottom shell; the side faces of the bottom shell are provided with the adjusting mechanisms used for being pressed against the sensors to be assembled; the adjusting mechanisms enter and exitfrom the side faces of the bottom shell in an adjustable way, so that the detection angles of the sensors to be assembled change along with the changes of the distances of the adjusting mechanisms entering and exiting from the bottom shell; and the sensors to be assembled are clamped between the adjusting mechanisms and the demising slots. Through adoption of the angle-based adjusting device, thedefect that the adjustment for the signal detection angles of the sensors is constrained in the prior art can be overcome; the optimal detection angles of the sensors can be adjusted more stably through manual control of the adjusting mechanisms under a corresponding scene; and the signal detection accuracy under a current scene is improved.

The invention relates to a strong magnetic interference resistant non-magnetic rotation signal acquisition device, which comprises a PCB (printed circuit board) circuit board and a semicircular steelplate. An external inductance coil, a timer and a voltage comparator are integrated on the PCB circuit board, and four groups of inductance coils are uniformly distributed on the inner periphery of the external inductance coil, and the semicircular steel plate rotates to shield any two adjacent inductance coils in the four groups of the inductance coils to generate changing current signals. Outputends of the four groups of coils are connected with a signal processing circuit, the timer in the signal processing circuit is used for calculating a voltage comparison value changing period of the voltage comparator, and signal output ends of the voltage comparison and the timer are both connected to an external terminal through TTL output interfaces. The strong magnetic interference resistant non-magnetic rotation signal acquisition device is internally free of magnetic components such as permanent magnets and low in internal and external magnetic force influences, measuring of rotation numbers and rotation speed and judgment of rotation directions can be realized according to an LC oscillating principle, and accuracy in measurement is achieved.

The invention discloses a hearth flameout detection device and a detection method thereof. The hearth flameout detection device comprises a sampler, a sensor, a full-hearth flameout protection deviceand a boiler protection system, wherein the sampler samples pressure in a hearth flue; the sensor is connected with the sampler; the full-hearth flameout protection device comprises a flameout analyzer and a power source for providing electric energy for the flameout analyzer; the sensor is connected with the flameout analyzer through a signal cable; and the flameout analyzer is connected with theboiler protection system. The method comprises the steps that the smoke pressure in a hearth is collected and measured through the sampler, converted into a pressure signal through the sensor and transmitted to the flameout analyzer, and the flameout analyzer outputs a signal which is output by the flameout analyzer and represents the combustion condition to the boiler protection system. The hearth flameout detection device makes up defects of an existing flameout protection device, has high reliability, improves the anti-explosion capacity of a boiler and avoids serious accidents, thereby greatly improving the safety of the boiler.

The invention discloses a dynamic pressure intelligent air bearing which comprises a bearing left end cover, a bearing sleeve, a bearing right end cover, piezoelectric ceramics (PZT), a pressure sensor, a vibration sensor, a temperature sensor, a sensor protection layer, a three-stage amplification mechanism, a retainer and a top foil. A pressure sensor and a vibration sensor are placed in a sensor protection layer at the bottom end of a three-stage amplification mechanism, a temperature sensor is placed on the back face of top foil, PZT is placed in symmetrical lever arm through grooves, the top foil is made of elastic materials and covers the three-stage amplification mechanism, and the three-stage amplification mechanism is fixed to a bearing sleeve through a retainer, a bearing left end cover and a bearing right end cover by bolts. A power supply signal coupling lever mechanism of a PZT is controlled through a sensor signal to amplify PZT deformation, a top foil is supported through a three-stage amplification mechanism, direct contact between a sensor and a rotating part is avoided, gas film pressure and vibration signals generated when an air bearing works are measured through the three-stage amplification mechanism, the measurement precision is improved, and the bearing characteristics are intelligently controlled.

The present invention realizes reduction of position information demodulation errors caused by the eccentricity of the magnetic disk and improvement of position signal detection accuracy, as well as enabling quick eccentricity clock correction for arbitrary clock frequencies. An inspection device in accordance with the present invention comprises: a servo demodulation unit which demodulates servo information; a PLL clock generating unit which generates a reference clock and supplies the reference clock to the servo demodulation unit; and a tester control unit. The PLL clock generating unit includes an eccentricity correction circuit for correcting the frequency of the reference clock depending on the eccentricity of the magnetic disk. The tester control unit generates correction data for correcting the frequency of the reference clock, multiplies the correction data by the inverse of a transfer function of the PLL clock generating unit, and supplies the product to the eccentricity correction circuit.

This invention improves the accuracy of wobble signal detection for disc discrimination and reduces discrimination errors due to noise. In an optical disc apparatus, a wobble signal generator creates a wobble signal from an electrical signal which has been obtained from conversion by a pickup. A bandpass filter (BPF) is set to change its central frequency to a wobble frequency f0 and to fn different from the wobble frequency, and the filter extracts the respective frequency components from the wobble signal. An amplitude-measuring section measures amplitude levels A0 and An of the extracted multiple signals. A disc discriminator compares the multiple amplitude levels and if the amplitude A0 is greater than the amplitude An by at least a threshold level Ath, judges that a wobble is present.

The invention discloses a waveguide probe coupler, and belongs to the technical field of electrommunication components and parts. For solving the problem that in the prior art, the coupling amount fluctuations are large within the broadband range, the internal structure of coupling through holes of the waveguide probe coupler is optimized, the multiple coupling through holes are connected in series through coaxial transmission lines with different characteristic impedances in an equivalent circuit in the coupler, and the flatness of the coupling amount is compensated for, so that the coupling amount flatness of the waveguide probe coupler within the ultra-broadband range can be effectively improved, and the signal detection accuracy of the system is greatly improved. On one hand, the advantages that a traditional waveguide probe coupler is simple and reliable in structure, small in size and low in cost are reserved; on the other hand, the coupling flatness index can be lowered to one tenth or lower of the coupling flatness index of the traditional waveguide probe coupler.

The MOEMS acceleration sensor system based on orthogonal carrier modulation provided by the invention solves the problem that the output signal of the MOEMS acceleration sensor system is influenced by the fluctuation of the phase difference between the laser carrier signal and the reference signal in the analog demodulation process, improves the signal detection precision, and is wide in application range. The voltage driving signal unit is used for outputting two paths of direct-current bias sinusoidal voltage signals with the phase difference of 90 degrees; the LD driving current control unit is used for converting the corresponding two paths of direct-current bias sinusoidal voltage signals into direct-current bias sinusoidal current signals with the phase difference of 90 degrees and outputting the direct-current bias sinusoidal current signals; the laser output unit is used for outputting two paths of laser signals corresponding to the two paths of direct-current bias sinusoidal current signals to the MEMS chip; and the optical signal processing loop is used for converting the two paths of laser signals carrying acceleration information after passing through the MEMS chip into two paths of electric signals, demodulating the two paths of electric signals to obtain two paths of demodulated signals, carrying out algorithm processing and outputting acceleration signals.

There is provided a signal detection circuit capable of detecting a signal at a high speed having small amplitude, and a data transfer control device and electronic equipment using the same. The signal detection circuit includes a peak hold circuit, a constant potential setting circuit, and a comparison circuit. The peak hold circuit holds a peak value of an input signal at a given node. The constant potential setting circuit always returns the potential at the given node changed by holding the peak value by the peak hold circuit to a constant potential at a time constant greater than the potential change caused by holding the peak value. The comparison circuit compares the potential at the node at which the peak value is held and which is slowly returned to the constant potential with a given reference level, and outputs the comparison result as a detection signal.

The invention provides a differential MEMS gas sensor, which is provided with two sets of chamber groups whose cavity space is mirror-symmetrical and arranged on the same layer, and each group of the chamber groups respectively includes an air chamber cavity and an acoustic chamber cavity which are communicated with each other; Each sound chamber is provided with a microphone for detecting sound signals; each group of chambers communicates with the atmosphere outside the differential MEMS gas sensor only through a plurality of ventilation holes provided on the top cavity wall of the gas chamber. The air chamber cavity of one of the chamber groups is also equipped with a laser assembly, and the laser energy generated by the laser assembly is injected into the air chamber cavity. The invention adopts the differential design of double air chambers, which greatly reduces the influence of environmental noise on the measurement, and has high precision and small volume.

The invention discloses a signal automatic detection method of an electromagnetic spectrum monitoring receiver, which includes signal enhancement characterization and integrated learning discrimination. The signal enhancement characterization is used to obtain the local mean difference and local median difference of the spectrum of each signal under different scales and local morphological processing differences, after which an enhanced representation matrix is ​​formed. The ensemble learning discrimination includes branch detector learning and ensemble detector learning. First, the signal detection training sample set is formed by the enhanced representation matrix of multiple signals, the sample subset is allocated to train the branch detector, and the detection results are recorded; then the detection results are used to construct an ensemble Learn the training sample set and train the ensemble detector. After the training of the integrated detector is completed, the branch detector and the integrated detector are combined, and the integrated detector outputs the final automatic signal detection result. The present invention has strong signal characterization ability and signal identification ability, thereby realizing good signal detection accuracy and stability.