183 results about "Signal cancellation" patented technology

Automatic turn signal cancellation in a vehicle for a roundabout is disclosed. The automatic turn signal cancellation system is configured to not prematurely cancel a turn signal until the exit of the roundabout is confirmed. A first turn signal activation in an opposite direction of a first turn is detected to signify possible entry into a roundabout. Automatic cancellation of the first turn signal is delayed in response to detecting remaining within the roundabout based on the detected vehicle turning pattern. This can prevent the driver having to again activate the first turn signal within the roundabout. Detection of subsequent activation of a second turn signal opposite of the first turn signal direction may signify exiting the roundabout. The second turn signal is cancelled if the vehicle is detected to return to a turn neutral position steering direction for a defined period of time signifying completion of roundabout exit.

The invention relates to the technical field of power system relay protection, and discloses a relay protection device mutual inductor adjustment system and method, and the system comprises a system connection initialization module, a data collection reference data generation module, a power frequency background signal offset module, a pilot frequency current injection error calibration module, and a calibration result verification output module. The method comprises the following steps: initializing sampling frequency of a to-be-calibrated mutual inductor and calibration source output precision of a calibration system, collecting amplitude and phase data of real-time power frequency current of the mutual inductor, generating offset current with equal amplitude and opposite directions through power electronic compensation based on reference data, optimizing offset current parameters through a closed-loop adjustment algorithm, and adjusting the offset current parameters through a closed-loop adjustment algorithm. Power frequency background signal offset is completed, pilot frequency calibration parameters are set, a difference value between a mutual inductor pilot frequency output signal and a calibration source standard signal is extracted by adopting a zero pointing technology, an optimal calibration coefficient is automatically calculated, verification of a calibration result is completed, and accuracy and reliability of the calibration result are ensured.

The invention relates to the technical field of road slope safety monitoring, in particular to a slope large deformation timely sensing and graded warning method based on a distributed optical fiber technology, and the method comprises the steps: arranging a first-stage sensing optical cable, a second-stage sensing optical cable, a third-stage sensing optical cable and a positioning optical fiber which are designed in a mechanical property gradient manner on a slope platform, and achieving the cooperation with the deformation of a rock-soil body; a double-threshold self-adaptive denoising algorithm is adopted to process optical signals, environmental interference is eliminated, and breakpoints are accurately recognized; three-level alarm is triggered based on the broken optical cable level, the slope sliding acceleration is calculated through a catastrophe evolution prediction model, advanced early warning is achieved, and when specific conditions are met, special-level alarm is triggered, and emergency broadcast is linked; high-precision position determination is achieved through stake mark matching positioning, and stable operation of the system is guaranteed by combining design of a temperature compensation optical fiber, an independent monitoring route and the like. According to the invention, deformation of different degrees of the slope can be accurately sensed, graded warning and intelligent decision making are realized, and the accuracy and reliability of slope disaster prevention and control are effectively improved.

The invention provides a fault-tolerant control method and a fault-tolerant control system for a dual-active bridge series resonant converter (DBSRC), and aims to solve the problems that the voltage and current stress is increased, the system reliability is reduced and the like caused by an open-circuit fault of a primary side switch tube or a secondary side switch tube. Through the dynamic reconstruction modulation strategy and the same bridge arm driving follow current suppression method, under the condition that redundant hardware is not needed, the voltage and current stress in the fault state is effectively reduced, and stable operation of the system is maintained. The method specifically comprises the following steps: when a primary side open-circuit fault occurs, optimizing a control parameter by adopting extended phase shift modulation (EPS), and compensating for loss of a power transmission path; and when the secondary side has an open-circuit fault, the driving signal of the other switching tube of the same bridge arm is cut off, and the direct-current bias of the resonance current is eliminated. According to the method, the fault-tolerant capability of the DBSRC is remarkably improved, the hardware cost and the maintenance complexity are reduced, and the method is suitable for a high-frequency isolation direct-current conversion system.

The present disclosure provides a gas sensor, including a substrate, a first housing fixed on the substrate and enclosed with the substrate to form a first chamber, and a first infrared transmitter and a first acoustic sensor connected to the substrate. The first acoustic sensor and the first infrared transmitter are housed in the first chamber, and the first housing is provided with a first venthole. The gas sensor also includes an environmental detection assembly connected to the substrate and located outside the first housing, and a differential processor connected to the substrate. The differential processor of the present disclosure can eliminate the ambient sound signal and the vibration signal in the first detection signal according to the second detection signal. Eliminate the strong interference of noise and vibration in the external environment, and improve the accuracy of the gas concentration detection of the gas sensor.

Dynamic speed-controlled automatic turn signal cancellation in a vehicle. An automatic turn signal cancellation system is configured detect steering wheel angle changes to indicate a vehicle turn and then a steering wheel angle returning towards turn neutral position for canceling turn signal. If steering wheel angle remains in the turn neutral position for a determined stability time, the turn is deemed completed and the turn signal is automatically cancelled. The stability time is dynamically determined inversely related to maximum steering wheel angle of the turn, because a steering wheel will return to a stable position faster from a larger steering wheel motion from a sharper turn. The automatic turn signal cancellation system can also dynamically set a threshold angle used to determine initial vehicle turn based on the speed of the vehicle because the faster the vehicle speed, the less steering wheel angle change is required to perform a turn.

The invention discloses a domestic high-power IGBT rectification system and method, and relates to the technical field of IGBT rectification, and the method comprises the steps: constructing an active front-end rectification main circuit; a direct current side hybrid harmonic modulation auxiliary circuit is integrated; performing multiple delay signal elimination operation on the sampled signal, filtering out a harmonic interference signal, and locking the frequency and phase of the fundamental voltage of the power grid through a phase-locked loop; establishing a control structure of a voltage outer loop and a current inner loop, generating an instruction amplitude of a grid-side active current and an ideal sinusoidal current reference waveform, and controlling an IGBT in an active front-end rectification main circuit in real time; real-time fast Fourier transform analysis is carried out on the actual input current of the grid side, and residual harmonic components are identified; and feedback management of regenerated energy is realized. The invention provides a fused high-adaptability active front-end IGBT (Insulated Gate Bipolar Translator) rectification method and system which can stably operate under the condition of power grid voltage distortion and realize deep harmonic suppression and efficient energy bidirectional flow.

Automatic turn signal cancellation in a vehicle (100) for a roundabout is disclosed. The automatic turn signal cancellation system (208) is configured to not prematurely cancel a turn signal (104A, 108A, 104B, 108B) until the exit of the roundabout is confirmed. A first turn signal (104A, 108A, 104B, 108B) activation in an opposite direction of a first turn is detected to signify possible entry into a roundabout. Automatic cancellation of the first turn signal (104A, 108A, 104B, 108B) is delayed in response to detecting remaining within the roundabout based on the detected vehicle turning pattern. This can prevent the driver having to again activate the first turn signal (104A, 108A, 104B, 108B) within the roundabout. Detection of subsequent activation of a second turn signal (104B, 108B, 104A, 108A) opposite of the first turn signal 104A, 108A, 104B, 108B) direction may signify exiting the roundabout. The second turn signal (104B, 108B, 104A, 108A) is cancelled if the vehicle (100) is detected to return to a turn neutral position (400, 402, 400W, 402W) steering direction for a defined period of time signifying completion of roundabout exit.

The invention discloses a single-phase phase-locked loop system capable of intelligently adjusting parameters, and the system comprises a spectrum analysis unit which outputs a fundamental wave frequency fc, a fundamental wave angular velocity omega c, and a cascade delay signal elimination parameter ni; the self-adaptive single-phase phase-locked loop unit comprises a third-order generalized integrator, a dq converter, a cascade delay signal canceller CDSC, a PI controller, an integrator and a modulus taking device, and the cascade delay signal canceller CDSC takes a fundamental wave frequency fc as a reference frequency and takes a fundamental wave angular velocity omega c as a reference angular velocity of an input end of the integrator; an angular velocity increment delta omega output by the PI controller and a fundamental wave angular velocity omega c are added to jointly determine a phase locking angle theta, and a proportionality coefficient kp and an integral coefficient ki of the PI controller are refreshed online from the outside and take effect immediately; and the control parameter intelligent optimization unit is used for iteratively solving the optimal [kp, ki] based on a mirage search optimization algorithm MSO and writing the optimal [kp, ki] into the nonvolatile memory. According to the single-phase phase-locked loop system capable of intelligently adjusting the parameters, manual parameter adjustment is avoided, and phase locking is rapid, accurate and stable for a long time.

The invention discloses a differential compression structured light illumination super-resolution imaging device based on time sequence multiplexing. The differential compression structured light illumination super-resolution imaging device is composed of a light source and beam expanding system, a structured light illumination imaging system, a coding aperture time domain compression imaging system, a time sequence control system and a data processing reconstruction system. According to the invention, the two digital micromirror devices are controlled through a time sequence, and wide-field and structured light compression imaging is realized respectively. In the wide-field mode, the two digital micromirror devices are switched to the total transmission mode, and fluorescence signals of the excitation sample are directly collected by the camera; in a structured light mode, the first digital micro-mirror device generates six time-varying stripe coding patterns, and dynamic space coding of the second digital micro-mirror device is combined, so that a camera obtains a compressed image through single exposure. Through differential processing of a wide field and a compressed image, background noise is suppressed, high-frequency information weight is enhanced, the bottleneck of high-frequency signal offset in traditional compressed imaging is broken through, image reconstruction quality is remarkably improved, and high-fidelity imaging of a high-speed dynamic scene is realized.

The invention discloses a variable-speed working condition rolling bearing fault diagnosis method based on improved wavelet packet transformation and envelope order tracking, and the method specifically comprises the steps: carrying out the equal-angle resampling of a vibration signal according to the phase of a rotating shaft, and carrying out the wavelet packet transformation of an angle domain vibration signal through an improved wavelet packet transformation algorithm, and finally, fault diagnosis is carried out according to the transformed envelope order spectrum of the wavelet packet coefficient of each node. According to the method, time domain signals are converted into angle domain signals through equal-angle resampling, frequency spectrum fuzziness caused by rotating speed changes is eliminated, and the angle domain signals are divided to different order bands through the excellent frequency domain decomposition capacity of an improved wavelet packet transformation algorithm so that sub-signals with the high signal-to-noise ratio can be obtained. And finally, solving the envelope spectrum of the sub-signal to further highlight the fault characteristics. According to the method, the problem of difficulty in fault diagnosis of the variable-speed working condition bearing is solved, meanwhile, the process of determining a high-frequency resonance frequency band by means of a kurtosis graph and extracting a high-frequency resonance signal through band-pass filtering is avoided, and the diagnosis method is simple, efficient and high in accuracy.

Methods and systems for low earth orbit satellite communications, utilizing fractionated satellites and constellations with large baselines. The latter, combined with spatial multiplexing protocols, provides access to user equipment on the ground with much greater spatial resolution than hitherto possible. Methods include overcoming the problem posed by the round-trip delay of satellite links when adaptive, downlink, beamforming is attempted in Frequency Division Duplex (FDD) systems. Methods include using of uplink and downlink pilot signals which eliminate the need for controlling the physical integrity of the fractionated satellite through an electromechanical servo-control system in space.

Dynamic speed-controlled automatic turn signal cancellation in a vehicle (100). An automatic turn signal cancellation system (208) is configured detect steering wheel angle (A1, A2) changes to indicate a vehicle turn and then a steering wheel angle (A1, A2) returning towards turn neutral position (400, 402, 400W, 402W) for canceling turn signal (104A, 108A, 104B, 108B). If steering wheel angle A1, A2) remains in the turn neutral position (400, 402, 400W, 402W) for a determined stability time (ts), the turn is deemed completed and the turn signal (104A, 108A, 104B, 108B) is automatically cancelled. The stability time (ts) is dynamically determined inversely related to maximum steering wheel angle (AMAX) of the turn, because a steering wheel (202) will return to a stable position faster from a larger steering wheel motion from a sharper turn. The automatic turn signal cancellation system (208) can also dynamically set a threshold angle (Φ1) used to determine initial vehicle turn based on the speed of the vehicle (100) because the faster the vehicle speed, the less steering wheel angle (A1, A2) change is required to perform a turn.

The invention discloses a wide-frequency three-phase phase-locked loop method, which relates to the technical field of three-phase phase-locked loops and comprises an alternating-current signal acquisition and coordinate transformation unit, a double-reduced-order generalized integrator, a frequency-locked loop frequency estimation unit, a double-second-order generalized integrator, a parallel delay signal cancellation filtering module and a phase-locked loop phase estimation unit. A three-phase power grid voltage signal is input into the alternating current signal acquisition and coordinate conversion unit to obtain a two-phase voltage under a static coordinate system; the double-reduced-order generalized integrator and frequency-locked loop frequency estimation unit outputs a three-phase power grid frequency estimation value and carries out feedforward; and the bisecond-order generalized integrator outputs a three-phase power grid positive sequence component, inputs the three-phase power grid positive sequence component into the parallel delay signal cancellation filtering module to filter out a higher harmonic component, and then inputs the three-phase power grid positive sequence component into the phase-locked loop phase estimation unit to output a three-phase power grid phase estimation value. The method can effectively solve the problem that a traditional phase-locked loop is difficult to lock the phase quickly and accurately when the ship microgrid frequency fluctuates in a large range, and improves the phase-locking precision and dynamic performance.

Sensorless method for chatter detection in machine tools. When the machine tool spindle is running, a spindle motor torque signal is analyzed in the time domain to determine whether an insert is currently machining a workpiece. If it is not machining, an air-cut reference signal is stored for later use. If it is machining, the spindle motor torque signal, along with positioning servo motor signals, is converted to the frequency domain and filtered. Filtering steps include eliminating the air-cut reference signal by spectral subtraction, eliminating harmonic components of the spindle, eliminating artificial peaks due to aliasing effects, and eliminating artificial peaks due to encoder error effects.After filtering, indicator criteria are evaluated to detect chatter. These criteria include the magnitude of the filtered torque signal for servo motor data and the ratio of the filtered torque signal to the air-cut reference signal for spindle data. If chatter is detected, corrective actions are taken.

The invention relates to a temperature drift compensation flexible pressure sensor system based on bionic mechanics. The temperature drift compensation flexible pressure sensor system comprises a flexible sensing module, a temperature drift compensation module and a signal processing module. The flexible sensing module is designed by adopting a bionic mechanical structure, and the mechanical characteristics of biological tissues are simulated by compounding a plurality of layers of flexible materials, so that high-sensitivity pressure detection is realized; the temperature drift compensation module is integrated with a temperature sensor and a compensation algorithm, monitors the environment temperature change in real time, dynamically adjusts a sensing signal and eliminates temperature interference; and the signal processing module is used for filtering, amplifying and digitally processing the compensated signal and outputting pressure detection data. According to the system, through combination of bionic structure design and intelligent temperature drift compensation, the measurement precision and stability of the flexible pressure sensor in a complex environment are remarkably improved, and the system is suitable for high-precision pressure detection requirements in the fields of medical treatment, robots and the like.

The invention discloses a frequency-locked loop of a self-adaptive delay signal elimination filter, which comprises a first filter, a second filter, a Park transformation module, a low-pass filter, an amplitude normalization module, an inverse Park transformation module, a frequency estimation module and a low-pass filter, and is characterized in that the first filter is used for eliminating higher harmonics, the second filter is used for eliminating low-order single harmonics, and the amplitude normalization module is used for normalizing the amplitude of the inverse Park transformation module. A signal passing through the filter is converted into a direct current component under a dq coordinate system through the Park conversion module, high-frequency clutter is filtered out through the low-pass filter, then the signal enters the amplitude normalization module, the signal amplitude is standardized to be 1, the signal is recovered into an alternating current signal through the reverse Park conversion module, the alternating current signal is input into the frequency estimation module, and the frequency estimation module estimates the frequency of the signal. And finally, a stable power grid frequency estimation value is obtained after processing by a low-pass filter. The invention aims to eliminate rounding errors and introduce a novel prefilter with relatively small time delay, so that the dynamic and steady-state performance of the first-order frequency-locked loop is improved.

The embodiment of the invention discloses a signal detection device, a signal detection method and electronic equipment, at least one radio frequency monitoring signal of a monitoring point in the electronic equipment is acquired through an acquisition unit, and each acquired radio frequency monitoring signal is output. Each radio frequency monitoring signal comprises a plurality of dot frequency signals, in order to obtain target signals, each radio frequency monitoring signal output by the acquisition unit can be received through the signal cancellation unit, and one or more dot frequency signals in the radio frequency monitoring signals are taken as the target signals according to the requirements of the electronic equipment; the method comprises the following steps: generating a cancellation signal with a frequency value to be cancelled according to a specific frequency value, enabling the cancellation signal to be generated locally, and then carrying out superposition cancellation on each radio frequency monitoring signal and the cancellation signal to obtain a radio frequency monitoring signal without a dot frequency signal with the frequency value to be cancelled. And outputting the radio frequency monitoring signal after the dot frequency signal with the to-be-cancelled frequency value is removed as a target signal.

The invention discloses an interference signal offset method based on modulation interference accurate reconstruction, and belongs to the technical field of satellite communication. The method comprises the following steps: carrying out symbol estimation, time delay estimation, carrier phase estimation and amplitude estimation of an interference signal on a mixed signal; carrying out carrier recovery on the mixed signal, reconstructing a symbol, and generating an interference signal for offset; carrying out time delay on the mixed signal, and carrying out time alignment on the mixed signal and a regenerated interference signal; using a channel response estimation method to counteract interference signals in the delayed mixed signals, and outputting residual low-speed signals; and carrying out carrier phase reduction on the residual low-speed signals to finish interference signal cancellation. The power spectrum density of the low-speed signals in the overlapped satellite communication system can be effectively reduced, and the system capacity of the low-speed signals is improved under the condition that the low-speed signals occupy the total satellite power.

The present disclosure provides a pseudolite receiver comprising a plurality of signal channels and a plurality of signal cancellation modules for processing baseband signals. The plurality of signal channels and the plurality of signal elimination modules alternately and sequentially carry out signal processing, any signal channel captures the strongest signal component in the baseband signal to be processed, generates a reconstructed signal component according to the tracking parameter of the strongest signal component and outputs the reconstructed signal component to the corresponding signal elimination module; the corresponding signal cancellation module cancels the reconstructed signal component from its baseband signal to be processed to generate an updated baseband signal to be processed. According to the invention, the adverse effect of strong signal interference on weak signal capture can be avoided, the influence of near-far effect on the pseudo-satellite receiver is reduced, and the capture performance of the pseudo-satellite receiver is improved.

The invention discloses a joint channel estimation and equalization method for an OFDM (Orthogonal Frequency Division Multiplexing) system under a fast time-varying channel. The joint channel estimation and equalization method comprises the following steps: S1, performing channel estimation by using a frequency domain pilot frequency; for one tap in the impact response of the channel, eliminating the ICI influence of other taps except the current tap from the received signal; s3, updating the current tap and the whole channel response; s4, calculating and updating the ICI component of the current tap; s5, the steps S2 to S4 are repeated for other taps in the impact response of the channel, a final ICI vector is obtained through updating, and the final ICI vector is composed of the ICI component of each tap; s6, eliminating ICI influences of all taps based on the final ICI vector; and S7, performing channel estimation by using the pilot frequency again according to the data after the ICI is eliminated, and executing the steps S2 to S7 until a set number of iterations is reached. According to the method, the ICI influence can be inhibited by gradually improving the estimation progress in an iteration mode, the implementation complexity is reduced by adopting serial processing, and hardware implementation is facilitated.

Techniques are disclosed for self-interference signal cancellation. A self-interference cancellation method includes measuring an error between an output of a hardware cancellation circuit and an output of a software model of the hardware cancellation circuit. The method further includes estimating an amplitude error, a phase error, and a delay error based on the measured error and the output of the hardware cancellation circuit, and locating a largest frequency domain error peak in the measured error. The method further includes applying an all-pass filter to the estimated and measured signals at the peak error frequency to produce a filtered estimated signal and a filtered measured signal and optimizing the filtered estimated signal and the filtered measured signal to obtain an optimized canceller setting. The optimized canceller setting is provided to the hardware cancellation circuit.

This application discloses a method and system for online condition assessment of permanent magnet motors based on multi-scale fuzzy entropy, relating to the technical field of permanent magnet motor fault diagnosis and reliability index analysis. It solves the technical problems of existing technologies that often rely on macroscopic parameters such as failure rate, making it difficult to quantify the degree of motor performance degradation and lacking consideration for real-time online condition assessment of permanent magnet motors, resulting in low accuracy and real-time performance of permanent magnet motor condition assessment. The method generates a radial air gap magnetic flux density difference signal based on the radial air gap magnetic flux density signal, and uses this to generate a multi-scale fuzzy entropy and a permanent magnet demagnetization assessment model. It generates the permanent magnet condition result based on the multi-scale fuzzy entropy corresponding to the online radial air gap magnetic flux density signal, and eliminates magnetic flux density background interference through the radial air gap magnetic flux density difference signal. By characterizing the subtle differences in signal complexity under different demagnetization states through multi-scale fuzzy entropy, it achieves a quantitative description of the degree of permanent magnet degradation, improving the real-time performance and accuracy of condition assessment.

The application relates to the technical field of general control or regulation systems, and discloses an automatic regulation method for a plug taking pump operation, which comprises the following steps: synchronously acquiring a voltage vector and a current vector of a controlled execution unit; calculating a transient active power by calculating a scalar product of the voltage vector and the current vector; removing a steady power consumption component in the transient active power to extract an energy recoil pulse; generating a micro-elastic recoil energy product representing load yield information by integration; monitoring a differential gradient of the micro-elastic recoil energy product; and determining an output negative gradient duty cycle signal at a collapse moment to regulate a power slope. The application uses a vector power analysis mechanism to capture a load fragmentation signal, eliminates hydraulic hysteresis of a control loop, ensures that a negative pressure release rate of a pipeline matches a load displacement increment, and improves regulation accuracy under a load impedance step working condition.

The embodiment of the invention discloses a vehicle parking method, a parking control system and a domain controller, the method comprises the steps that the domain controller of a vehicle detects whether the distance between the vehicle and a parking point is smaller than a preset first distance or not, if yes, a pull-in mode enable signal is generated and sent to a chassis control unit, and if not, the chassis control unit controls the vehicle to stop; and the domain controller responds to a reflector signal output when the photoelectric sensor detects the positioning reflector installed at the parking point, generates the jump trigger signal and sends the jump trigger signal to the chassis control unit, so that the chassis control unit controls the vehicle to perform emergency braking and completes parking. According to the method, sensor signals are directly processed through the chassis bottom layer, calculation time consumption and communication delay of an upper-layer system are eliminated, and the effect of accurate parking is achieved. Moreover, when the distance between the vehicle and the parking point is smaller than the preset first distance, the chassis control unit is activated to receive the jump triggering signal, false triggering caused by other reflective objects is effectively avoided, and the system safety is improved.

There is disclosed an apparatus. The apparatus comprises means for performing: in response to detecting a jamming signal, obtaining a sample waveform of the jamming signal; and sending information of the jamming signal to another apparatus.

The present invention describes a rotor blade (2) having a leading edge (23) and a trailing edge (24), wherein the rotor blade (2) is designed and configured to be exposed to a fluid flowing substantially from the leading edge (23) to the trailing edge (24), the rotor blade (2) including at least two sensors (31) designed to detect the flow characteristics of the fluid and provide corresponding sensor signals, and the rotor blade (2) further including at least two actuators (32) for generating an anti-noise signal (36) based on the sensor signals, the sensors (31) being arranged along the spanwise direction at a surface of the rotor blade (2), and the actuators (32) being arranged along the chord direction at a surface of the rotor blade (2), and the actuators (32) being arranged and prepared such that flow-induced edge noise (35) of the rotor blade (2) generated by the fluid is at least partially eliminated by the anti-noise signal (36). The present invention further describes a method for forming such a rotor blade, and a related wind turbine.

The application provides a multi-excitation vibrator vibration test control method, device, terminal and medium, the method comprises the following steps: obtaining a multi-channel white noise signal and a multi-channel output signal, and obtaining an adaptive inverse matrix according to the multi-channel white noise signal and the multi-channel output signal; the driving signal of the current frame is applied to the test piece through the excitation vibrator, and the test piece response signal is obtained; the dynamic target phase is obtained according to the test piece response signal; the driving signal of the next frame is obtained according to the dynamic target phase, the test piece response signal, the driving signal of the current frame and the adaptive inverse matrix, and the test piece is controlled according to the driving signal of the next frame through the excitation vibrator, and the test piece response signal of the next frame is obtained. The inter-channel antagonistic effect is eliminated, the error is efficiently eliminated, the number of iterations required to reach the target spectrum tolerance band is shortened, and the control convergence speed is improved.

The invention belongs to the technical field of petroleum well logging, and discloses a method for eliminating array induction direct coupling signals, which comprises the following steps of: calibrating the unit thickness change of an adjusting piece and the quantitative contribution of each receiving coil direct coupling signal through electromagnetic simulation modeling and an underground environment equivalent experiment; the target thickness is solved and replaced through a linear correction model, closed-loop calibration is matched to enable a direct coupling signal to approach a preset threshold value, based on array induction logging, an existing three-coil system structure is difficult to thoroughly offset the direct coupling signal due to machining errors, useful signal extraction is seriously disturbed, the method does not need to modify a core structure of an instrument, operation is easy and convenient, adaptability is high, and the method is suitable for large-scale popularization and application. Direct coupling signals are eliminated accurately and thoroughly, the measurement accuracy of the stratum conductivity is effectively improved, and reliable data support is provided for oil and gas reservoir identification and evaluation.

The invention discloses a radio frequency signal receiver module and a wireless microwave gateway, and belongs to the technical field of wireless monitoring. The invention relates to a radio frequency signal receiver module, which receives a radio frequency signal returned by a passive tag and a leaked carrier signal, eliminates a large direct current component generated by the leaked carrier signal, and then converts the radio frequency signal into an intermediate frequency digital signal to be output. The wireless microwave gateway provided by the invention comprises the radio frequency signal receiver module. According to the passive tag return signal receiver module, the passive down-conversion mixer is matched with the band-pass filter to eliminate a large direct-current component generated after a leakage carrier is subjected to down-conversion, and the influence on a post-stage circuit of the receiver module is reduced, so that the sensitivity of the receiving module is improved, the receiver module is prevented from being blocked, and the service life of the receiver module is prolonged. The obtained intermediate frequency signal has high fidelity, and the demodulation precision is greatly improved.