74 results about "Modulation effect" patented technology

The invention provides a single-ring sum-difference dual-modulation three-rotor coaxial magnetic gear and a new energy automobile hub motor. The magnetic gear comprises an h-type dual-modulation magnetic ring, an outer rotor, an inner rotor and a middle rotor. The inner rotor, the middle rotor and the outer rotor are coaxially and sequentially nested from inside to outside; the h-type dual-modulation magnetic modulation ring is positioned among the inner rotor, the middle rotor and the outer rotor, and is coaxially arranged with the inner rotor, the middle rotor and the outer rotor; the middle rotor is used as a power input rotor, the inner rotor and the outer rotor are used as power output rotors, a sum modulation effect is adopted from the middle rotor to the inner rotor, a difference modulation effect is adopted from the middle rotor to the outer rotor, and the sum modulation effect and the difference modulation effect share the h-type dual-modulation magnetic modulation ring; therefore, the h-type dual-modulation magnetic flux modulation ring modulates the axial magnetic flux and the transverse magnetic flux at the same time. The torque transmission capacity of the magnetic gear can be improved, the magnetic saturation phenomenon is restrained, the magnetic field modulation effect is enhanced, and the torque density of the magnetic gear is improved.

The invention discloses an optical communication wavelength meter for exciting rubidium atom two-photon transition based on a lithium niobate microcavity optical comb. The optical communication wavelength meter comprises a microcavity optical comb module, a repetition frequency phase-locked loop, an initial frequency phase-locked loop, a rubidium atom gas chamber and a frequency-stabilized light source. The micro-cavity optical comb module is used for generating a fundamental frequency optical comb and a frequency doubling optical comb, rubidium atom two-photon transition is directly excited, the frequency stabilization light source achieves frequency stabilization through rubidium atom saturation absorption, and the repetition frequency phase-locked loop feeds back and adjusts repetition frequency according to error signals of two-photon transition fluorescence intensity. The initial frequency phase-locked loop feeds back and adjusts the initial frequency through beat frequency signals of the frequency multiplication optical comb and the frequency stabilization light source, and the two groups of phase-locked loops stabilize the frequency of the microcavity optical comb to two groups of transition energy levels, so that locking of the repetition frequency and the initial frequency is realized. According to the optical communication wavelength meter based on the lithium niobate microcavity optical comb excitation rubidium atom two-photon transition, the cross modulation effect in a pumping wavelength and pumping power combined adjustment mechanism is avoided, and the size of the optical communication wavelength meter is reduced.

The invention discloses an electromagnetic field simulation method under the coupling action of tidal waves and sea waves. The method comprises the steps that input parameters of the tidal waves and the sea waves are set; configuring environmental parameters and geomagnetic conditions; superposing the tidal wave velocity field and the sea wave disturbance velocity field to form a total velocity field; the tidal wave part and the sea wave part are linearly coupled in time and space to obtain a tidal wave-sea wave coupling field evolved along with a tidal phase; in the tidal wave-sea wave coupling field, electromagnetic response calculation is executed on each frequency-direction sampling point; general field synthesis and modulation effect analysis: introducing a tidal wave modulation factor to clearly reflect amplitude periodic change and spectrum reconstruction characteristics of an electromagnetic field signal along with a tidal phase; and outputting a time sequence, an amplitude spectrum and a spatial distribution result of the comprehensive electromagnetic field. According to the method, the authenticity and applicability of sea wave induction electromagnetic field simulation can be improved, and a new technical means is provided for electromagnetic noise recognition, sea wave parameter inversion and complex ocean dynamics process research.

The invention relates to the technical field of bridge load tests, and provides a bridge load test crack increment change observation method and system, and the method comprises the steps: collecting prestressing tendon circumferential strain distribution data and dual-wavelength strain response data; calculating an interface bonding stiffness change parameter; pre-stress modulation effect compensation and polar coordinate system conversion are carried out on the strain response data and the rigidity change parameters, and micro-crack characteristic signals are obtained; load data and beam group arrangement parameters are collected, and a micro-crack propagation prediction model is established in combination with the interface bonding stiffness change parameters; inputting the micro-crack characteristic signal into a micro-crack propagation prediction model, and outputting a micro-crack development trend prediction result; and adjusting sampling parameters of a dual-wavelength time division multiplexing algorithm and characteristic extraction parameters of prestress modulation effect compensation according to a micro-crack development trend prediction result. According to the invention, the precision of observing the increment change of the micro-crack in the bridge load test is improved, and the automatic monitoring and prediction of the micro-crack of the prestressed concrete bridge are realized.

The invention discloses a wide-spectrum electromagnetic wave modulation method based on silver-based chalcogenide, and belongs to the technical field of electromagnetic wave modulation. According to the invention, the abrupt-change modulation of 1GHz-300THz wide-spectrum electromagnetic waves is realized based on the electronic phase change characteristic of the metal insulator under the triggering of the silver-based chalcogenide under the characteristic external field, and the resonant structure design is combined, so that the functions and applications of electromagnetic wave switching, electromagnetic wave intelligent shielding, dynamic information communication encryption, multi-spectrum camouflage and passive electromagnetic wave protection are realized. The main conception is that a silver-based chalcogenide material with an electronic phase change characteristic is introduced as a sensitive medium, and mutation of electromagnetic wave optical characteristics covering microwave, terahertz and infrared frequency bands caused by electronic phase change of the silver-based chalcogenide is triggered by utilizing characteristic temperature, characteristic pressure and characteristic current. According to the invention, the technical barrier of wide spectrum response and multi-mode dynamic modulation is broken through, and the modulation effect can be cooperatively regulated and controlled by the components of the silver-based chalcogenide material and the structure of the resonant array.

The invention provides a plasma transient time boundary-based terahertz wave spectrum regulation and control method and device, and the method comprises the steps: obtaining femtosecond laser and terahertz waves, and enabling the femtosecond laser and the terahertz waves to enter a terahertz wave transmission space through beam combination; when the femtosecond laser and the terahertz wave synchronously pass through a first position point, the terahertz wave after frequency spectrum regulation and control is obtained; the first position point is located in the terahertz wave transmission space, a time boundary caused by medium transient refractive index sudden change is formed at the first position point when the femtosecond laser ionizes gas to obtain plasma, and frequency shift occurs when terahertz waves pass through the time boundary. According to the invention, the modulation effect on the terahertz wave frequency demand can be realized according to the abrupt change of the refractive index caused by the transient generation of the plasma.

The invention discloses a method and system for detecting the magnetization direction of an unmagnetized magnet, and belongs to the technical field of magnetic material detection. The method comprises the following steps: applying an external guide magnetic field to a to-be-detected non-magnetized magnet; detecting a signal related to the physical state of the non-magnetized magnet under the action of the guide magnetic field as a response signal; and judging the magnetization direction of the non-magnetized magnet based on the corresponding relation between the response signal and the preset magnetization direction. The corresponding system comprises a guide magnetic field generation unit, a detection unit and a discrimination unit. The modulation effect of magnetocrystalline anisotropy of a non-magnetized magnet on an external magnetic field is utilized, invisible magnetic domain orientation information is converted into externally observable physical field difference, efficient, visual and lossless recognition of the preset magnetization direction is achieved, and the method is suitable for production quality control of magnetic assemblies such as a Halbach magnetic circuit and the like.

The embodiment of the invention discloses a background Alpha rhythm-based audio-visual perception ability evaluation method, which comprises the following steps of: acquiring an individual Alpha peak frequency of each subject, and setting various background rhythm stimuli for each subject; enabling each subject to execute various audio-visual perception tasks while the various background rhythms are stimulated, so as to collect electroencephalogram data and behavior data of each subject when the various audio-visual perception tasks are executed under the stimulation of the various background rhythms; performing feature extraction on the electroencephalogram data of each subject to obtain electroencephalogram features; performing feature extraction on the behavior data of each subject to obtain behavior features; screening electroencephalogram features related to improvement of the behavior features from the electroencephalogram features to obtain effective electroencephalogram features; and based on the effective electroencephalogram characteristics of each subject under the individual Alpha rhythm stimulation and the effective electroencephalogram characteristics of each subject under each contrast rhythm stimulation, calculating the modulation index of each subject so as to quantitatively evaluate the adjustment effect of the individual Alpha rhythm stimulation on the audiovisual perception ability of each subject.

The invention discloses a signal transmission and modulation system based on edge calculation, which relates to the field of signal transmission and modulation and comprises a transmission center in communication connection with a signal acquisition module, a signal modulation module, a transmission channel planning module and a signal demodulation module. Environmental signals in a vegetable greenhouse are collected, the collected environmental signals are modulated to obtain corresponding environmental modulation signals, a transmission channel is arranged to transmit the environmental modulation signals, the transmitted environmental modulation signals are demodulated to obtain original environmental signals, the original environmental signals are sent to a user side, and the modulation effect is evaluated. The transmission integrity of the signal in the channel is ensured, the transmission channel is adjusted according to the actual situation, and the transmission speed of the signal is increased.

This application discloses an optical communication wavelength meter based on lithium niobate microcavity optical comb-excited rubidium atom two-photon transitions, comprising a microcavity optical comb module, a repetition frequency phase-locked loop (PLL), an initial frequency PLL, a rubidium atom gas cell, and a frequency-stabilized light source. The microcavity optical comb module generates a fundamental frequency optical comb and a frequency-doubled optical comb to directly excite rubidium atom two-photon transitions. The frequency-stabilized light source achieves frequency stabilization through rubidium atom saturation absorption. The repetition frequency PLL adjusts the repetition frequency based on the error signal of the two-photon transition fluorescence intensity. The initial frequency PLL adjusts the initial frequency by feeding back the beat signal between the frequency-doubled optical comb and the frequency-stabilized light source. The two PLLs stabilize the microcavity optical comb to two sets of transition energy levels, achieving frequency locking between the repetition frequency and the initial frequency. The optical communication wavelength meter based on lithium niobate microcavity optical comb-excited rubidium atom two-photon transitions provided in this application avoids the cross-modulation effect in the joint adjustment mechanism of pump wavelength and pump power, reducing the size of the optical communication wavelength meter.

The application discloses a phase-amplitude decoupling modulator for complex amplitude modulation, which comprises at least a first modulation layer, a second modulation layer and a phase-amplitude decoupling modulator, wherein the phase-amplitude decoupling modulator comprises a controller, a first excitation module and a second excitation module; the first excitation module inputs independent excitation signals to the first modulation pixel unit; and the second excitation module inputs independent excitation signals to the second modulation pixel unit. The application breaks through the shackles of low amplitude-phase modulation level, mutual restraint of phase-amplitude modulation effect, complex preparation process and the like, and can realize independent and multi-order amplitude modulation and phase modulation for complex amplitude complete information reconstruction, so that the resolution, amplitude distribution uniformity, precision, signal-to-noise ratio and other performances are improved, and the dynamic switching of images and the improvement of reconstructed image quality are completed.

A chip, a chip-on-carrier, a transmitter, and a related device. The chip comprises a conductive substrate (100), an insulating layer (200), a quantum well (300), a first capacitor pad (400), a distributed feedback laser (DFB) pad (500) and an electrical absorption modulator (EAM) pad (600), wherein the insulating layer (200) and the quantum well (300) are grown on the conductive substrate (100), the DFB pad (500) and the EAM pad (600) are grown on the insulating layer (200) and the quantum well (300), the first capacitor pad (400) is grown on the insulating layer (200), and the first capacitor pad (400) is used for forming a first capacitor with the conductive substrate (100). In this way, a capacitor is built in an EML chip, such that the modulation effect of a high-frequency signal on a DFB region can be effectively mitigated while a COC structure and process are simplified, thereby realizing differential driving having a lower RIN.

The invention relates to the technical field of data exception processing, in particular to a causal reasoning analysis method for data system exception access. Comprising the following steps: acquiring a temperature sensitive parameter of a hardware capacitor in a data system, a hidden offset parameter of a software process priority and a frequency drift parameter of environmental electromagnetic radiation; establishing a first coupling relationship between the hardware capacitor temperature sensitive parameter and the software process priority hidden offset parameter, wherein the first coupling relationship reflects the nonlinear influence of the hardware capacitor temperature change on the software process scheduling period; constructing a second coupling relationship between a software process priority recessive offset parameter and an environment electromagnetic radiation frequency drift parameter based on the first coupling relationship, wherein the second coupling relationship reflects a modulation effect of software process resource preemption on an electromagnetic radiation source working duty ratio; according to the invention, the problem of insufficient low-probability abnormal event positioning capability caused by multi-factor coupling in the prior art can be solved.

The utility model discloses an SIP radio frequency surface-mounted BPSK modulator, which relates to the technical field of semiconductor radio frequency devices, and comprises a substrate and a phase-locked loop circuit arranged on the substrate, the phase-locked loop circuit is connected with a power divider and a differential buffer output unit, the power divider and the differential buffer output unit are connected with a modulation multiplier, and the modulation multiplier is connected with an SIP radio frequency surface-mounted BPSK modulator. The modulation multiplier is connected with a baseband processing unit and a first filter, the baseband processing unit is connected with a first signal input end, the first filter is connected with a switch modulation unit, the switch modulation unit is connected with a second signal input end and a second filter, and the second filter is connected with a signal output end. The device provided by the utility model has the advantages of small size, integration, multiple functions and good modulation effect.

A multi-core optical fiber and an acousto-optic modulation device. The multi-core optical fiber comprises: an acoustic-excitation core, a plurality of outer cores, a trench layer, and a cladding; the acoustic-excitation core is located at the circle center position of the cladding, and the distances between the acoustic-excitation core and the plurality of outer cores are equal; the trench layer is arranged on the outer side of the acoustic-excitation core; and the plurality of outer cores have the same core spacing and are annularly arranged around the acoustic-excitation core. By using the acoustic-excitation core, the multi-core optical fiber can simultaneously modulate a plurality of light-guiding cores within the cladding, achieving consistent modulation effects.

The invention relates to the technical field of digital pre-distortion, in particular to an adjacent multiband digital pre-distortion system and method, and the method comprises the steps: S1, extracting an intermodulation feature vector of an adjacent multiband input signal, and constructing a nonlinear coupling feature matrix based on the intermodulation feature vector; and S2, generating a frequency band cooperative compensation signal by using the nonlinear coupling characteristic matrix, wherein the frequency band cooperative compensation signal is used for compensating an asymmetric cross modulation effect between adjacent frequency bands. And S3, constructing a dynamic pre-distortion parameter optimization model based on the distortion characteristic analysis result of the frequency band cooperative compensation signal and the power amplifier output signal, and generating a final pre-distortion output signal through real-time feedback adjustment. According to the method, the nonlinear primary function set including the high-order intermodulation item and the inter-band cross modulation component is constructed, and the nonlinear coupling feature matrix extracted by singular value decomposition is combined, so that inter-band collaborative modeling and compensation signal generation are realized, and the adaptive capacity under the complex working condition is enhanced.

The invention provides an edge light intensity adaptive laser scanning device and method based on a perturbation modulation strategy, and relates to the field of adaptive laser scanning devices. The edge light intensity adaptive laser scanning device based on the perturbation modulation strategy comprises a laser source used for generating a laser beam, a modulator connected with the laser source and used for modulating the laser beam according to the perturbation modulation strategy, a scanning mirror used for receiving the modulated laser beam and scanning the modulated laser beam to a target surface, and a light intensity detector used for detecting the light intensity of the laser beam. The method is used for monitoring light intensity of a target surface edge area in real time. According to the invention, through a perturbation modulation strategy combining sinusoidal modulation and random modulation, accurate control of the light intensity of the laser beam is realized, the modulator adopts an acousto-optic modulator, and the intensity and frequency of the laser beam can be flexibly adjusted in a sinusoidal frequency range of 1 kHz to 10 kHz and a random frequency range of 10 Hz to 1 kHz, so that periodic and random light intensity changes are generated, and the accuracy of the light intensity of the laser beam is improved. And the modulation effect is enhanced.

The present application discloses a method and device for partial discharge localization based on optical fiber sensing to measure ultrasonic signals. The solution provided by the present application is based on the ultrasonic signals obtained by an optical fiber sensing measurement system. By performing a Hilbert transform on the output signal of the optical fiber sensing measurement system, that is, the amplitude of the Rayleigh backscattering spectrum curve group, and extracting its envelope, the modulation information of the ultrasonic signals is obtained. Then, through differential processing, the modulation effect on the disturbance signals is revealed. Based on the time interval when the peaks appear in the signal curve group after differential processing, combined with the speed of light and the equivalent group velocity in the optical fiber, and the triggering time of the pulse signal, the specific location of the disturbance is determined, realizing partial discharge localization based on optical fiber sensing to measure ultrasonic signals.

The present invention discloses a frequency-tunable loop oscillator, which includes: an LDO unit and a VCO loop oscillation unit. The LDO unit includes an LDO power supply circuit and an LDO bias current trimming circuit. The LDO power supply circuit and the LDO bias current trimming circuit cooperate to provide a voltage and a preset bias current for the VCO loop oscillation unit. The VCO loop oscillation unit generates an oscillation clock signal according to the voltage and the preset bias current. By the cooperation of the LDO power supply circuit and the LDO bias current trimming circuit to provide a voltage and a preset bias current for the VCO loop oscillation unit, trimming is performed on the loop oscillator to eliminate the non-linear influence brought by power supply noise and modulation effect.

The application provides a large-span tower lightning activity modulation detection method and system, relates to the field of lightning monitoring and protection, and solves the technical problem that it is difficult to accurately identify the modulation effect of towers on lightning activity under a detection method with small data volume and without relying on distribution assumptions; the method comprises the following steps: performing data processing on lightning event data to obtain sample set one and sample set two, calculating the distribution difference and the significance threshold of sample set one and sample set two in a three-dimensional space, and judging whether the tower construction has a modulation effect on lightning activity based on the distribution difference and the significance threshold; if yes, calculating the annual lightning density change rate and the lightning current amplitude median drift amount before and after the tower is put into operation in each concentric ring-shaped region, and performing smooth fitting to obtain a fitting curve; determining the modulation region and the corresponding spatial position parameters based on the fitting curve; and the application can improve the accuracy of identifying the modulation effect of large-span towers on lightning activity.

The application provides a large-span tower lightning activity modulation detection method and system, relates to the field of lightning monitoring and protection, and solves the technical problem that it is difficult to accurately identify the modulation effect of towers on lightning activity under a detection method with small data volume and without relying on distribution assumptions; the method comprises the following steps: performing data processing on lightning event data to obtain sample set one and sample set two, calculating the distribution difference and the significance threshold of sample set one and sample set two in a three-dimensional space, and judging whether the tower construction has a modulation effect on lightning activity based on the distribution difference and the significance threshold; if yes, calculating the annual lightning density change rate and the lightning current amplitude median drift amount before and after the tower is put into operation in each concentric ring-shaped region, and performing smooth fitting to obtain a fitting curve; determining the modulation region and the corresponding spatial position parameters based on the fitting curve; and the application can improve the accuracy of identifying the modulation effect of large-span towers on lightning activity.

The present invention discloses a non-reciprocal electromagnetic protection system controlled based on the diode conductance modulation effect. The multi-port transmission module is used to distinguish the flow direction of radio frequency signals. The energy entering from the first type of radio frequency port is shunted in the module. Part of it flows out from the second type of radio frequency port, and the other part of the energy flows out from the control port to reach the control module. While the energy entering from the second type of radio frequency port will only flow out from the first type of radio frequency port. When the radio frequency signal is input from the first type of radio frequency port, when the control module receives the energy from the first type of radio frequency port, it inhibits the diode conductance modulation. When the radio frequency signal is input from the second type of radio frequency port, the control module does not receive energy and does not inhibit the diode conductance modulation. The present invention adopts non-reciprocal technology to protect both the receiving and transmitting channels simultaneously without interfering with normal transmission, and has a simple structure and is easy to integrate.

The invention relates to the technical field of high and low voltage, and discloses a high and low voltage power distribution cabinet abnormal current intelligent modulation method, which comprises the following steps: respectively aiming at three phase sequences, obtaining real-time current sequences at multiple moments, analyzing current quality based on the real-time current sequences obtained by sampling, constructing a real-time current matrix according to the real-time current sequences, and calculating the abnormal current of a high and low voltage power distribution cabinet according to the real-time current matrix. And the current matrix is compared with a standard current matrix, so that whether the current is abnormal or not can be quickly and directly judged. According to the method, a standard current matrix and a real-time current matrix are differenced, and an abnormal current sample combination capable of forming an overall difference current matrix is searched in an abnormal current sample set according to a superposition principle, so that rapid abnormal current analysis can be realized, various abnormal current components can be extracted, and classification and modulation of the abnormal current can be realized. And meanwhile, a control signal is dynamically adjusted through an adaptive fuzzy control method, the abnormal current is dynamically modulated, the control signal is dynamically adjusted according to the modulation effect, and closed-loop control of the modulation process is achieved.

The invention relates to the technical field of motor health state diagnosis, and particularly discloses a motor health state diagnosis system based on multi-sensor fusion, which comprises a multi-source sensing acquisition module, a high-precision time synchronization module, a dynamic feature extraction module, a self-adaptive fusion decision module and a health state output module, according to the invention, a high-precision time synchronization module is constructed, and a strategy of combining hardware timestamp injection with phase offset estimation based on cross-correlation and rotation modulation compensation is adopted, so that time alignment of three kinds of heterogeneous signals of vibration, current and temperature at a sub-microsecond level is realized; the problem of feature space distortion caused by sensor sampling frequency difference and a mechanical rotation modulation effect under a high-speed working condition is fundamentally solved, and the space-time consistency of original data is remarkably improved.

The invention relates to the technical field of power system monitoring and load management, and particularly discloses a non-intrusive target load identification method based on cloud-end scene migration, which introduces a physical consistency data enhancement mechanism at a cloud end, and simulates a modulation effect of voltage sag on a background load by calculating a dynamic coupling modulation factor. And a high-fidelity enhanced triple data set is generated, so that the problem that the coupling characteristic of a circuit is neglected in traditional data enhancement is solved. On this basis, a brand invariance feature extractor is trained by using hierarchical metric learning, and class essential features are learned by optimizing an inter-class and inter-brand distance forced model. Finally, the feature extractor and the classification head are assembled into a generalization model to be deployed to the end side, reasoning is carried out by freezing parameters of the feature extractor, the cross-brand generalization problem caused by physical heterogeneity of the electric appliance is effectively solved, and accurate identification of the electric appliance with no brand at the end side is achieved.

This electromagnet structured to minimize spatial constraints comprises: an iron core composed of a body part for supporting the bottom, and a pair of head parts that protrude a predetermined length from both ends of the body part so as to face each other; and a pair of coil parts wound around the outer part of the iron core, wherein the head parts are formed in a polyhedral shape having a polygonal cross-section so that a magnetic field is formed in a space where the head parts face each other and the center position of the magnetic field varies in the vertical direction according to the shape of the surface where the head parts face each other.

The invention relates to an M3C low-frequency port modeling method, device, equipment and medium based on multi-frequency coupling, and the method comprises the steps: carrying out the non-single frequency multiplication sequence decomposition of voltage, current and modulation signals in an M3C bridge arm loop under a static coordinate system, extracting the steady-state component of each frequency component, and constructing an M3C steady-state frequency domain model; based on the model, analyzing frequency coupling characteristics of the power frequency component, the low frequency component and the circulating current component in the bridge arm current, and establishing a frequency-crossing conversion relation between the bridge arm current and the power frequency current, and between the bridge arm current and the low frequency current and the circulating current; based on the cross-frequency conversion relation, performing frequency domain modeling on the low-frequency side control signal, and establishing a low-frequency modulation small signal model; the modulation effect of a control loop is introduced, a bridge arm modulation small signal comprehensive model is established, equivalent coupling factors of power frequency power grid impedance and a low-frequency transformer are considered, and an admittance model of an M3C low-frequency port is deduced. The method has the effect of improving the judgment accuracy of the dynamic relation between the bridge arm current and the port voltage under the low-frequency and frequency doubling coupling condition.

The application relates to the technical field of integrated circuits, and discloses a hysteresis comparator circuit based on double-gate field effect tubes and an integrated chip, wherein the hysteresis comparator circuit comprises at least two cascaded inverters, each inverter comprising at least one input tube and one load tube, wherein the drain of the input tube and the source of the load tube are connected, and a connection node is configured as an output end of the inverter, and at least one of the input tube and the load tube of each inverter is a double-gate field effect tube; a feedback conductive wire is connected between the second gate of the double-gate field effect tube in the first-stage inverter and the output end of the other inverters, so that the signals on the first gate and the second gate of the double-gate field effect tube change in the same phase, to constitute positive feedback for realizing hysteresis effect. The application utilizes the common modulation effect of the two gates of the double-gate field effect tube to constitute the hysteresis effect, reduces the difficulty of on-chip integration of the hysteresis comparator, and improves the flexibility of the hysteresis comparator.

The present invention discloses an on-orbit directional pattern calibration method for a satellite-borne microwave scatterometer based on an active calibrator. The method comprises: obtaining the elevation angle and azimuth angle of the beam at different times within the scatterometer antenna system based on the position information of the active calibrator; obtaining the elevation angle and azimuth angle of the beam at different times within the active calibrator antenna system based on the pointing information and position information of the active calibrator; obtaining the data power received by the active calibrator at different times based on the power signal received by the active calibrator and the elevation angle and azimuth angle of the beam at different times within the active calibrator antenna system; and obtaining the antenna pattern of the scatterometer based on the data power received by the active calibrator at different times. The present invention solves the problem of directional pattern calibration under rapidly changing scatterometer antenna coordinate systems and compensates for the modulation effect of the active calibrator on the satellite-borne directional pattern, thereby improving the on-orbit test accuracy of the antenna pattern.

This invention discloses a laser device, a lidar, and a laser detection method. The laser device includes: a laser chip for generating a laser beam signal based on a driving signal; a beam signal transmission device disposed on the beam signal transmission path for splitting the laser beam signal generated by the laser chip into a probe beam and a feedback beam, wherein the probe beam is used for target detection; a feedback link for receiving the feedback beam and determining a corresponding feedback electrical signal based on the feedback beam; and a control module for receiving the feedback electrical signal, determining characteristic parameters of the laser beam signal based on the feedback electrical signal, and adjusting the driving signal based on the characteristic parameters, wherein the characteristic parameters include at least one of the following: signal amplitude, frequency modulation bandwidth, and frequency modulation linearity. This invention solves the technical problem of poor modulation effect of laser signals in related technologies.