75results about How to "Eliminate Phase Error" patented technology

The invention relates to a synthetic aperture radar interferometric ionized layer phase estimation and compensation method, which is characterized by comprising the specific steps of: step 1, carryingout precision registration of primary and subsidiary images and resampling of the subsidiary image; step 2, optimizing a lookup table and resampling the subsidiary image again; step 3, carrying out bandpass filtering on the primary and subsidiary images, and generating full bandwidth and subband differential interferograms; step 4, performing ionized layer phase estimation; step 5, and conductingsurface deformation phase solution. The synthetic aperture radar interferometric ionized layer phase estimation and compensation method can obtain a more precise registration offset amount, significantly improves the coherence of the images, and is more continuous in interferograms. The synthetic aperture radar interferometric ionized layer phase estimation and compensation method constructs SLCimages of front and rear sub-bands, can identify the influence of ionized layer path delay on radar images by utilizing the multi-aperture radar interferometry, constructs two upper and lower sub-bandsignals with different center frequencies, estimates and eliminates phase errors caused by electron density change of the ionized layer through optimizing the ionized layer estimation processing step, and improves the interferometric precision.

Provided is a broadband synthetic aperture radar sub-band interferometric data processing method. The broadband synthetic aperture radar sub-band interferometric data processing method comprises the steps of (1) carrying out self-adaptive precise registration on main images and auxiliary images and resampling the auxiliary images, (2) optimizing sub-band frequency spectrum positions and broadband, (3) carrying out band-pass filtering on the main images and the auxiliary images, (4) generating sub-band interferograms and sub-band difference interferograms, (5) carrying out phase compensation on a reference plane and a DEM, and (6) carrying out stack processing on the sub-band difference interferograms. According to the broadband synthetic aperture radar sub-band interferometric data processing method, absolute radar interferometric phases can be obtained without phase unwrapping under most conditions, digital terrain maps or earth surface deformation maps can be directly obtained through transformation, and error diffusion caused by phase unwrapping mistakes can be eliminated. The broadband synthetic aperture radar sub-band interferometric data processing method is especially suitable for digital topographic mapping in high mapping regions, monitoring on landslides with large deformation velocity and monitoring on mine collapse.

The invention discloses a photovoltaic grid-connected inverter control method with multi-resonance PR and PI joint control. The method comprises the steps of (S01) adding a higher harmonic compensation link in a quasi-PR controller to form a multi-resonance PR controller, (S02) taking a difference between a given grid-connected current Iref and an actual grid-connected current IL as an input of the multi-resonant PR controller, (S03) taking a difference between a grid-connected current direct-current reference value IL-dc and a grid-connected current DC amount as an input of a PI controller, (S04) adding an output of the multi-resonant PR controller and an output of the PI controller to be a control signal for turning on and off an inverter switch tube, and (S05) obtaining an equivalent proportional gain kIL of an average value of the actual grid-connected current IL to the actual grid-connected current IL. The invention provides the photovoltaic grid-connected inverter control methodwith multi-resonance PR and PI joint control, the influence of grid voltage harmonics and distortion on the grid-connected current is suppressed, the DC component of the grid-connected current is alsoeliminated, and the high-quality control of a non-isolated photovoltaic grid-connected inverter is achieved.

The invention relates to the technical field of wireless communication, in particular to a novel digital pseudo code synchronization method for a spread spectrum microwave receiver. The novel digital pseudo code synchronization method for the spread spectrum microwave receiver includes steps that capturing, to be specific, using the auto-correlation features of PN codes to compare a received signal with local PN codes in sequence, performing the correlation operation, after detecting the related results and performing self-adapting threshold detection, regulating the phases of local spread spectrum codes, and turning to a tracking step after meeting the self-adapting threshold requirement through detection and amplitude detection; tracking, to be specific, using the correlation between the phase of the code element advancing the local spread spectrum code sequence by 1 / 2 and the phase of the code element lagging behind the local spread spectrum code sequence by 1 / 2 and the received signal to obtain an error control signal, wherein the error control signal is used as a phase discrimination result to be input to a code element clock generator to regulate the PN code phases and keep the rigid synchronization between the local PN codes and the received signal. The novel digital pseudo code synchronization method for the spread spectrum microwave receiver is capable of eliminating the phase error so as to realize the precision of the phases of the local spread spectrum sequence and received sequence and the consistency there-between to realize the best receiving effect.

The invention discloses an oscillator disciplining system for a satellite clock device of a power system, which comprises a digital phase discriminator which takes 1PPS output by a satellite time transfer receiver as a reference to discriminate the phase of 1PPS output by a high-stability crystal oscillator at divided frequency, wherein the digital phase discriminator is connected with a proportional integral controller; the voltage output by the proportional integral controller is transmitted to a pressure controlled control end of the high-stability crystal oscillator; the pressure controlled control end performs the fine adjustment of output frequency; and the high-stability crystal oscillator is connected with a frequency divider. The oscillator disciplining system for the satellite clock device of the power system is reasonable in structure, can eliminate an accumulated phase error and has excellent tracking performance. Due to adopted proportional plus integral control, the 1PPS output by the high-stability crystal oscillator can track the 1PPS of a satellite step by step, and if the 1PPS of the satellite is stable and final phase error is zero. When the 1PPS of the high-stability crystal oscillator locks the 1PPS of a satellite, the frequency of the 1PPS is calibrated.

The present invention discloses a life detecting system and method based on a multi-rotor UAV. The system comprises a multi-rotor UAV and a life detecting radar device mounted on the multi-rotor UAV,and further comprises a motion compensating device connected with the life detecting radar device. When the multi-rotor drone is flying in a to-be-tested area, the life detecting radar device performsliving body target detection; and during the detection process of the life detecting radar device, the motion compensating device performs motion compensation on a radar detection signal according tothe real-time position information of the multi-rotor drone so as to compensate for the displacement deviation caused by the jitter of the multi-rotor UAV. The technical scheme of the present invention has the advantages of a simple structure, a low cost, dynamic life detection, high detection efficiency, high precision, a flexible detection mode, and the like.

The invention discloses a permanent magnet linear motor controller which controls a motor by means of a combination of an H-infinity robust controller, a ZPETC (zero phase error tracking controller) and an interference observer. The ZPETC is used as a feed-forward controller of a system and reduces phase errors by means of zero point elimination. The interference observer eliminates high-frequency interference signals by being provided with a low-pass filter. The H[sigma] robust controller utilizes a mixed-sensitivity design method, comprehensively considers balance between sensitivity and robustness, and sets the optimization of the parameters of the H-infinity robust controller by performing fuzzy judgment on the results of the ZPETC and the interference observer. The controller combining the above three methods optimizes the dynamic performance and the stable performance of a permanent magnet linear motor, and may effectively improve positioning precision, a response characteristic, and an anti-interference capability.

The invention discloses an amplitude-comparison angle measurement method capable of eliminating interchannel phase error. The amplitude-comparison angle measurement method comprises the following steps: obtaining and transmitting echo signals reflected on a moving object; obtaining the sum channel signals and difference channel signals of the echo signals; carrying out phase correction on the difference channel signals relative to the sum channel signals to obtain difference channel signals after correction; and obtaining the angle value of the moving target according to the specific value ofthe difference channel signals after correction and the sum channel signals. According to the amplitude-comparison angle measurement method disclosed by the invention, the elimination for interchannelphase error is carried out after the moving target is detected, so that the angle measurement accuracy is higher, and the algorithm operation efficiency and angle measurement flexibility are improved.

The invention discloses a WLAN ranging technology based on a software radio platform. Firstly, a GPS atomic clock with high precision is obtained by a GPS disciplined oscillator ( GPSDO ) to be used as a reference clock source of the software radio platform, and the phase error caused by sampling frequency offset is eliminated by the method. Then the phase error caused by carrier frequency offsetis eliminated by subtracting the phase value of a first subcarrier used for communication from all subcarriers. Then the phase error caused by packet detection delay is eliminated by setting the sampling time in advance to zero. Finally, cubic spline interpolation is used for eliminating the ambiguity of whole circles among sub-carriers, and equipment is corrected once by a known distance to obtain the phase difference between the initial sub-carriers, while the actual measured distance can be obtained by adding the known distance to the actual measured distance difference, and higher rangingaccuracy can be obtained by the method.

The invention discloses a time-sharing phase short-range laser rangefinder and a method for improving measurement accuracy. The laser rangefinder comprises a transmitting unit, a receiving unit, a phase-detecting main control unit, keys / LCD (liquid crystal display) and a mirror driving auxiliary unit, wherein the keys / LCD and the mirror driving auxiliary unit comprise a key module, an LCD module and a mirror driving module comprising a micro-motor, a mirror and a mirror driving mechanism, and the core of the phase-detecting main control unit is the chip MCUAtmega128 embedded with an AD (active directory) interface. The time-sharing phase short-range laser rangefinder has the advantages that a set of optical path and electric circuit of the rangefinder with the time-sharing mechanism is capable of completing the functions of two sets or three sets of optical paths and electric circuits by timesharing; in addition to optical path ranging, reference signal and measurement signal are in the same signaling pathway from beginning to end; and phase error caused by inconsistencies of the optical path and electrical path of the reference / ranging signals as well as dispersion and temperature change characteristics of electronic device parameters is eliminated, and thus, ranging accuracy and reliability are improved, and cost is reduced.

The invention provides a radio-frequency power measurement system. The radio-frequency power measurement system comprises a coaxial power transmission device, a voltage probe, a first current probe, a second current probe and a signal collecting and processing device. The coaxial power transmission device is used for transmitting radio-frequency power signals and comprises an inner conductor stick and an outer conductor ring, wherein the inner conductor stick is arranged in the outer conductor ring in a sleeved mode. The voltage probe is arranged on the outer conductor ring and used for detecting radio-frequency voltage signals of the coaxial power transmission device. The first current probe and the second current probe are arranged on the outer conductor ring and distributed on the two sides of the voltage probe in the axial direction of the inner conductor stick. The signal collecting and processing device is connected with the voltage probe, the first current probe and the second current probe so as to confirm the radio-frequency power of the radio-frequency power signals according to the radio-frequency voltage signals detected by the voltage probe and radio-frequency current signals detected by the first current probe and the second current probe. By means of the radio-frequency power measurement system, phase errors caused by the spatial distance between the voltage probe and the current probes can be eliminated, the radio-frequency power measurement system has high measurement accuracy for the radio-frequency plasma coupling power, and the radio-frequency power measurement system is simple and reliable in structure.

The invention provides a sensing optical fiber ring and an all-fiber current transformer based on the sensing optical fiber ring. The sensing optical fiber ring uses two torsion optical fibers with the same torsion structure and length and an inverse torsion direction of a linear polarization maintaining optical fiber; one ends of the two torsion optical fibers are fused at an angle of 0 degree; one non-fused ends of the torsion optical fibers are respectively used as two external ends of the entire sensing optical fiber ring; the two torsion optical fibers are wound on a coil framework in the same direction by using a fusing position as a start point; a start point of a start rotation section of each torsion optical fiber and a start point of a speed-reducing rotation section of each torsion optical fiber are located at the same axial wire of the coil framework; and an end point of the start rotation section of each torsion optical fiber and an end point of the speed-reducing rotation section of each torsion optical fiber are located at the same axial wire of the coil framework. With the adoption of the sensing optical fiber ring provided by the invention, the influence on the measurement of the all-fiber current transformer caused by properties of a lambda / 4 wave plate can be avoided; and meanwhile, the measurement error of the all-fiber current transformer, caused by the Sagnac effect, can be removed, so that the ubiquitous technical difficult problem of the all-fiber current transformer can be solved.

The invention provides a capacitive sensor based on resonant frequency measurement and a working method and an application thereof. The capacitive sensor includes a sensor probe forming a flat capacitor together with a detected pole plate, an equal amplitude frequency stabilizing sinusoidal oscillator connected with a probe end of the flat capacitor, an equal amplitude frequency stabilized sinusoidal oscillator, a local oscillator used for outputting amplitude and frequency-stable local oscillator signals, an orthogonal demodulator used for demodulating an oscillating signal into an in-phase component and an orthogonal component through the local oscillator signal, and an orthogonal phase measuring device used for calculating an inverse tangent function of the orthogonal component and thein-phase component to obtain the phase and the frequency of a frequency difference signal, wherein a detected pole plate end of the flat capacitor is grounded, the equal amplitude frequency stabilizedsinusoidal oscillator is used for outputting an oscillating carrier signal with the stable amplitude and the frequency offset corresponding to the displacement amount or the area change amount of thedetected pole plate, and the displacement amount or the area change amount of the detected pole plate is obtained based on the relationship between the frequency of the frequency difference signal and the capacitance change amount. The capacitive sensor is advantaged in that precise measurement can be achieved in a quite wide range of sampling frequencies.

The present invention provides a two-dimensional coding synthetic aperture radar three-dimensional imaging array deformation error compensation method. The method comprises: performing forward rail direction-intersection rail direction space modulation of echo signals through two-dimensional MURA codes; in the condition that an intersection rail direction array has deformation error and performs slow time change along the forward rail direction, performing downward-looking three-dimensional imaging of two paths of echo signals after modulation; performing interference processing of two three-dimensional complex images, and removing a random initial phase and phase errors generated by the deformation errors; establishing an SAR complex image frequency domain coefficient relation after time-domain echo signal-interference; employing a l1 norm optimization criterion, and performing solution of the relation; and performing inverse transformation of the obtained frequency domain coefficients to a spatial domain, and obtaining a target scene three-dimensional image to equivalently realize array deformation error compensation. The three-dimensional imaging array deformation error compensation method obtains a three-dimensional image with good focusing when the precision of the array deformation measurement system is a wavelength magnitude so as to reduce the precision requirement of the array deformation measurement system.

The invention relates to a reflection type terahertz spectrum analysis method for eliminating a phase error, which comprises the following steps of: 1, measuring a terahertz time domain waveform of a reference signal when a sample to be tested is not placed; 2, measuring a terahertz time domain waveform of information when the sample to be tested is placed; 3, respectively obtaining angular frequencies corresponding to phase spectrums omega of the reference signal and the sample to be tested in a system effective frequency range according to the terahertz time domain waveforms; 4, deducting the phase spectrum of the sample to be tested by the phase spectrum of the reference signal to obtain a phase difference spectrum; and 5, deviating second derivative for the angular frequency corresponding to the phase difference spectrum to extract a terahertz characteristic absorption spectrum of the sample to be tested in the system effective frequency range.

The invention discloses a phase quantization analog-to-digital converter circuit with addition weight calibration, which relates to a micro-circuit structure, and especially relates to an analog-to-digital converter circuit for realizing phase quantization. Aiming at the problems that an adder module of a traditional circuit is nonlinear in phase weighting and the amplitude weights between different phases are different, the invention provides a novel circuit architecture: an addition weight calibration module is added on the basis of the traditional circuit, and the module comprises an error voltage detection sub-module and a quiescent current regulation sub-module. The addition weight calibration module detects the output voltage of an adder, controls the operating state of the adder module and realizes the addition weight calibration. The phase quantization analog-to-digital converter circuit with the addition weight calibration provided by the invention can eliminate the phase error induced by the nonlinearity of the adder module and the difference of amplitude weight between different phases, improve the circuit performance, save research and development time and cost and has a good application prospect.

The invention provides a sensing optical fiber coil and an all-fiber current transformer, wherein the sensing optical fiber coil is formed by winding a sensing optical fiber through a special method, and the all-fiber current transformer is made of the sensing optical fiber coil. The sensing optical fiber coil comprises a section I optical fiber ring and a section II optical fiber ring which are formed by winding a twisted optical fiber on a coil skeleton in the shape of an '8', wherein the section I optical fiber ring and the section II optical fiber ring are opposite in winding direction, the section I optical fiber ring is composed of a starting rotation section and a speed reducing rotation section of the twisted optical fiber, and the section I optical fiber ring is composed of a high-speed constant-speed rotation section of the twisted optical fiber. The axis of the section I optical fiber ring is parallel to the axis of the section II optical fiber ring, and the enclosing area of the section I optical fiber ring equals the enclosing area of the section II optical fiber ring. The section I optical fiber ring is used as a compensation ring of the sensing optical fiber coil, the section II optical fiber ring is used as a sensing ring of the sensing optical fiber coil, and a current wire penetrates through the section II optical fiber ring. According to the sensing optical fiber coil and the all-optical fiber current transformer, the influence on the measurement of the all-optical fiber current transformer due to incomplete performance of lambada / 4 wave plates is avoided, and meanwhile, measurement errors, caused by the Sagnac effect due to vibration, of the all-fiber current transformer are eliminated.

The invention relates to a time-sharing sampling holding circuit comprising an input buffer and a clock processing circuit. The input buffer drives a first sampling holding circuit and a second sampling holding circuit simultaneously and drives a first differential amplifier and a second differential amplifier respectively; the first differential amplifier drives a third sampling holding circuit;and the second differential amplifier drives a fourth sampling holding circuit. The clock processing circuit is used for receiving an external clock signal CLK and then generating clock signals; the clock signals CLK1A and CLK2A drive the first sampling holding circuit and the second sampling holding circuit respectively; the clock signals CLK1B and CLK2B drive the third sampling holding circuit and the fourth sampling holding circuit respectively; and the clock signals CLK1C and CLK2C drive the third sampling holding circuit and the fourth sampling holding circuit respectively. On the basis of the designed clock processing circuit, two sampling channels carry out sampling on analog signals strictly according to an external clock signal frequency, thereby eliminating a phase error and achieving an objective of realizing a high sampling frequency by a circuit with a low sampling frequency.

The invention discloses a quasi-PCI and PI combined control single-phase photovoltaic grid-connected inverter current control method in the technical field of new energy photovoltaic power generation.The method comprises the following steps of: adding a cut-off frequency into a proportional complex integral (PCI) controller to form a quasi-PCI controller; realizing a complex number field in a single-phase quasi PCI through a lag output item of a second-order generalized interactor (SOGI); taking a difference value between a given grid-connected current iref and an actual grid-connected current iL as the input of the quasi-PCI controller; taking a difference value between a grid-connected current direct current quantity reference value IL-dc and a grid-connected current direct current quantity as an input of a PI controller; and after the output of the quasi PCI controller and the output of the PI controller are added, controlling the switching-on and switching-off of an inverter switching tube through PWM modulation. According to the invention, the influence of power grid voltage fluctuation and frequency offset on the grid-connected current is suppressed, the direct-current component of the grid-connected current is eliminated, and high-quality control is realized while the design of a non-isolated photovoltaic grid-connected inverter current controller is simplified.

The invention belongs to the technology filed of wireless communication, relating to a method for jointly demodulating MSK (minimum shift keying) and DSSS (direct sequence spread spectrum) and a demodulator thereof. The demodulator comprises an error information obtaining module, a match filter module, a synchronous information trapping module, a demodulating module and a tracking module; and themethod for jointly demodulating MSK and DSSS comprises the following steps of: (1) obtaining error information, (2) matching and filtering the error information, (3) trapping synchronous information,(4) demodulating, (5) tracking, or the like, and sending demodulation results to parent process so as to complete communication process. The invention has the advantage of better frequency compensation ability, thereby, solving the problems that a method for dispreading and demodulating direct sequence spread spectrum signals needs to be frequency offset estimated, complex extraction of PN code synchronization and bit synchronization, etc. Compared with the existing dispreading and demodulating method, the invention is simple as needing no carrier recovery module nor bit timing module, and isapplicable to the wireless communication system.

The invention provides a deformation error compensation and target detection method for a ship-borne radar array based on interference processing, and the method comprises the steps: S1, carrying outthe real aperture imaging of a ground object scene or a moving object through two pieces of echo data of the array at the same moment; S2, carrying out the interference processing of two two-dimensional complex images, and removing a deformation error phase of the array; S3, building a relation between echo signal-reference phase and the product of frequency domain coefficient vectors of the complex images; S4, solving a relation reconstruction image through an l1 norm optimization criterion; S5, carrying out the inverse transformation of the image into a space domain, and obtaining a two-dimensional image of the array after the compensation of a deformation error. In a ground imaging mode, the method can achieve the frequency domain low-pass filtering of the two-dimensional spectrums of the complex images after interference, achieve the inverse transformation of the image into the space domain, and obtain the three-dimensional image of the ground object scene. The method obtains the ground imaging result with the good focusing effect, can remove the defocusing effect caused by the movement of the target, and improves the target detection performance of a radar.

The invention discloses an oscillator disciplining system for a satellite clock device of a power system, which comprises a digital phase discriminator which takes 1PPS output by a satellite time transfer receiver as a reference to discriminate the phase of 1PPS output by a high-stability crystal oscillator at divided frequency, wherein the digital phase discriminator is connected with a proportional integral controller; the voltage output by the proportional integral controller is transmitted to a pressure controlled control end of the high-stability crystal oscillator; the pressure controlled control end performs the fine adjustment of output frequency; and the high-stability crystal oscillator is connected with a frequency divider. The oscillator disciplining system for the satellite clock device of the power system is reasonable in structure, can eliminate an accumulated phase error and has excellent tracking performance. Due to adopted proportional plus integral control, the 1PPSoutput by the high-stability crystal oscillator can track the 1PPS of a satellite step by step, and if the 1PPS of the satellite is stable and final phase error is zero. When the 1PPS of the high-stability crystal oscillator locks the 1PPS of a satellite, the frequency of the 1PPS is calibrated.

Provided is a broadband synthetic aperture radar sub-band interferometric data processing method. The broadband synthetic aperture radar sub-band interferometric data processing method comprises the steps of (1) carrying out self-adaptive precise registration on main images and auxiliary images and resampling the auxiliary images, (2) optimizing sub-band frequency spectrum positions and broadband, (3) carrying out band-pass filtering on the main images and the auxiliary images, (4) generating sub-band interferograms and sub-band difference interferograms, (5) carrying out phase compensation on a reference plane and a DEM, and (6) carrying out stack processing on the sub-band difference interferograms. According to the broadband synthetic aperture radar sub-band interferometric data processing method, absolute radar interferometric phases can be obtained without phase unwrapping under most conditions, digital terrain maps or earth surface deformation maps can be directly obtained through transformation, and error diffusion caused by phase unwrapping mistakes can be eliminated. The broadband synthetic aperture radar sub-band interferometric data processing method is especially suitable for digital topographic mapping in high mapping regions, monitoring on landslides with large deformation velocity and monitoring on mine collapse.

The invention discloses a carrier frequency offset error elimination method and a carrier frequency offset error elimination system based on a specific antenna array switching sequence, which are applied to a Bluetooth wireless communication system. The method comprise the following steps: enabling a signal receiving end to switch a reference antenna and an array antenna in a time-sharing manner through a specific sequence to receive a Bluetooth signal; calculating the phase difference between the sampling points of which the reference antenna time interval is integer multiples of the carrier period to obtain a frequency offset error value; and carrying out phase compensation on other array antennas through the calculated phase error value. On the basis of specific receiver antenna array arrangement, a reference antenna is introduced, a specific antenna switching sequence and a phase compensation algorithm are provided, phase errors caused by carrier frequency deviation brought by asynchronous crystal oscillators of a receiver and a transmitter are eliminated, and the reduction degree of sampling signals is improved. The method is low in requirement for the number of data channels, low in calculation complexity and suitable for receiver signal processing of single-data-channel multi-antenna time-sharing switching.

The invention discloses a reference period signal carrier frequency offset elimination method and system based on Bluetooth fixed frequency expansion, which are applied to a Bluetooth wireless communication system. The method comprises the following steps: establishing synchronous connection between a Bluetooth receiving end with a receiving antenna array and a Bluetooth transmitting end, and adding compensation to sampling data by calculating a difference value between a phase difference between fixed-frequency extension reference period signal sampling points in a received Bluetooth signal packet and a theoretical phase difference; and eliminating a phase error caused by carrier frequency deviation due to asynchronous crystal oscillators of the receiver and the transmitter in the synchronization process. Under the working mode of single-data-channel multi-antenna time-sharing sampling, the reduction degree of the transmitted signal is improved, so that the estimation precision of the direction of arrival algorithm based on the fixed-frequency extended signal is further improved. The method is low in calculation and hardware complexity and suitable for low-power-consumption Bluetooth 5.1 and above protocols, multiple time-sharing antennas of a receiver share a single data receiving channel, and a received data packet comprises signal phase correction and restoration of a reference period.

The invention relates to a circuit breaker electronic release free of a grounding current sampling special instrument transformer. The electronic release is characterized in that main loop current is used for converting phase current into low-voltage potential signals through three-phase air-core circuit instrument transformers respectively; the three-phase air-core circuit instrument transformers are connected to a phase line current sampling processing circuit of an original electronic type circuit breaker electronic release, and are connected to three groups of low-pass active filter circuits consisting of resistors, capacitors and integrated circuits for filtering electromagnetic interference in the main loop; filtered each-phase potential signals enter a subtraction circuit formed by a resistor and an integrated circuit so as to carry out operation on the signals; and the operation result is subjected to inverting amplification through a proportioning operational amplifier consisting a resistor and an integrated circuit, and grounding current signals which are collected and subjected to operation access to an analog-digital (AD) conversion port of a microprocessor for being processed. According to the electronic release disclosed by the invention, when the grounding current signals are sampled, the grounding current sampling special instrument transformer is omitted, the manufacturing cost is reduced, the installation volume is reduced, the accessing difficulty of the circuit breaker in an operation system is improved, and the structure is simple.

The invention provides a radio-frequency power measurement system. The radio-frequency power measurement system comprises a coaxial power transmission device, a voltage probe, a first current probe, a second current probe and a signal collecting and processing device. The coaxial power transmission device is used for transmitting radio-frequency power signals and comprises an inner conductor stick and an outer conductor ring, wherein the inner conductor stick is arranged in the outer conductor ring in a sleeved mode. The voltage probe is arranged on the outer conductor ring and used for detecting radio-frequency voltage signals of the coaxial power transmission device. The first current probe and the second current probe are arranged on the outer conductor ring and distributed on the two sides of the voltage probe in the axial direction of the inner conductor stick. The signal collecting and processing device is connected with the voltage probe, the first current probe and the second current probe so as to confirm the radio-frequency power of the radio-frequency power signals according to the radio-frequency voltage signals detected by the voltage probe and radio-frequency current signals detected by the first current probe and the second current probe. By means of the radio-frequency power measurement system, phase errors caused by the spatial distance between the voltage probe and the current probes can be eliminated, the radio-frequency power measurement system has high measurement accuracy for the radio-frequency plasma coupling power, and the radio-frequency power measurement system is simple and reliable in structure.

The invention provides an integrated BGO crystal optical waveguide closed-loop electric field detection system with reciprocal optical path, including: SLD broadband light source, circulator, polarizer, phase modulator, BGO integrated optical waveguide field sensor, photoelectric detector and signal processing module , BGO integrated optical waveguide field sensor is a kind of optical waveguide structure with optical path reciprocity written on the symmetrical BGO crystal by femtosecond laser, so that the orthogonal polarization mode has gone through the same length of optical path after passing through the two crystals , so the phase difference produced by the natural birefringence is successfully cancelled. The invention eliminates the phase error caused by natural birefringence, temperature change and gas pressure, and can further reduce the nonlinear error of the system and increase the dynamic range of the system by introducing the feedback phase difference.

The invention discloses a life detection system and method based on a multi-rotor unmanned aerial vehicle. The system includes a multi-rotor unmanned aerial vehicle, a life detection radar device mounted on the multi-rotor unmanned aerial vehicle, and a motion detection radar device connected to the life detection radar device. Compensation device. When the multi-rotor UAV is flying in the area to be tested, the life detection radar device detects the life object. During the detection process of the life detection radar device, the motion compensation device adjusts the target according to the real-time position information of the multi-rotor UAV. The radar detection signal performs motion compensation to compensate for the displacement deviation caused by the jitter of the multi-rotor UAV. The invention has the advantages of simple structure, low cost, capable of realizing dynamic life detection, high detection efficiency and precision, flexible detection mode, and the like.