An automatic detection system and method of a wideband pulsed electromagnetic field

Abstract

This invention discloses an automatic detection system and method for broadband pulsed electromagnetic fields. The system includes a control and analysis module that sends first and second control signals to a mechanical turntable structure and an integrated module. The mechanical turntable structure moves along a preset trajectory and feeds back angle data to the control and analysis module. A probe group senses the spatial electric and magnetic fields and outputs first and second electrical signals. The integrated module processes the first and second electrical signals to obtain first and second analog signals, samples the first and second analog signals to obtain first and second digital signals, processes the first and second digital signals to obtain a second frequency domain signal, and feeds the signal back to the control and analysis module. The control and analysis module performs spatiotemporal correlation based on the first and second digital signals, the first and second frequency domain signals, and the angle data to obtain an electromagnetic field radiation pattern, electromagnetic field distribution, and pulse characteristic analysis results.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic field measurement technology. More specifically, it relates to an automatic detection system and method for broadband pulsed electromagnetic fields. Background Technology

[0002] Currently, with the development of fields such as pulsed electromagnetic radiation, electromagnetic weapons, electromagnetic compatibility, and electromagnetic safety, the demand for testing electromagnetic field strength has gradually expanded from single low-frequency responses to the measurement of pulse signals with wide bandwidth and wide dynamic range. Especially in application scenarios such as performance evaluation of high-frequency broadband pulsed radiation sources, electromagnetic environment monitoring, transient electromagnetic effect research, and electromagnetic field safety assessment, it is usually necessary to simultaneously measure the transient changes of electric and magnetic fields and analyze the time-domain waveform, spectral characteristics, peak field strength, and energy distribution of the pulse signal.

[0003] However, current technology still suffers from the following problems: insufficient bandwidth, as most traditional probes and acquisition systems lack sufficient bandwidth, making it impossible to accurately capture the rapid changes in pulse signals (such as nanosecond-level leading edges and high-frequency oscillations); lack of real-time analysis capabilities, as most systems only acquire waveforms and cannot achieve real-time FFT processing to obtain spectral data; low automation, with direction finding relying on manual labor and lacking linkage with mechanical turntables and synchronized angle recording; and poor system integration, as traditional electromagnetic field testing systems are large, costly, and have poor synchronization, making them unsuitable for automated testing and inefficient.

[0004] Therefore, a highly integrated, high-bandwidth, and high-speed processing automated testing system is needed to achieve automated scanning, real-time acquisition, and spectrum analysis of broadband pulse electromagnetic fields. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic detection system and method for broadband pulsed electromagnetic fields, so as to solve at least one of the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The first aspect of this invention provides an automatic detection system for broadband pulsed electromagnetic fields, the system comprising: The control and analysis module is used to send a first control signal to the mechanical turntable structure and a second control signal to the integrated module. The mechanical turntable structure is used to move along a preset trajectory in response to a first control signal and to feed back spatial angle data to the control and analysis module. The probe group is set on the mechanical turntable structure and is used to sense the spatial electric field and output a first electrical signal that is proportional to the time derivative of the electric field strength when the mechanical turntable structure moves; and to sense the spatial magnetic field and output a second electrical signal that is proportional to the time derivative of the magnetic field strength. An integrated module is used to integrate, filter, amplify, and impedance match a first electrical signal to obtain a first analog signal; integrate, filter, amplify, and impedance match a second electrical signal to obtain a second analog signal; digitally sample the first analog signal to obtain a first digital signal; digitally sample the second analog signal to obtain a second digital signal; perform frequency band spectrum analysis and pulse detection on the first digital signal in response to a second control signal to obtain a first frequency domain signal; perform frequency band spectrum analysis and pulse detection on the second digital signal in response to a second control signal to obtain a second frequency domain signal; and feed back the first digital signal, the second digital signal, the first frequency domain signal, and the second frequency domain signal to the control and analysis module. The control and analysis module is also used to perform spatiotemporal correlation based on the first digital signal, the second digital signal, the first frequency domain signal, the second frequency domain signal, and spatial angle data to obtain electromagnetic field radiation patterns, electromagnetic field distribution, and pulse characteristic analysis results.

[0007] Optionally, the probe group includes an electric field probe and a first balun, a magnetic field probe and a second balun; The electric field probe is used to sense the spatial electric field and outputs a first differential electrical signal that is proportional to the time derivative of the electric field strength. The first balun is used to convert the first differential signal into a first electrical signal; The magnetic field probe is used to sense the spatial magnetic field and outputs a second differential electrical signal that is proportional to the time derivative of the magnetic field strength. The second balun is used to convert the second differential signal into a second electrical signal.

[0008] Optionally, the mechanical turntable structure includes a three-axis mechanical turntable, a motor, a drive controller, and an encoder; The drive controller is used to generate a drive signal based on the first control signal; The motor is used to rotate in response to a drive signal; The three-axis mechanical turntable is used to move when the motor rotates; The encoder is used to feed back the spatial angle data of the probe group to the control and analysis module.

[0009] Optionally, the integrated module includes a signal conditioning module and a signal acquisition and processing module; The signal conditioning module is used to integrate, filter, amplify, and impedance match the first electrical signal to obtain a first analog signal, and to integrate, filter, amplify, and impedance match the second electrical signal to obtain a second analog signal. The signal acquisition and processing module is used to digitally sample a first analog signal to obtain a first digital signal, digitally sample a second analog signal to obtain a second digital signal, perform frequency band spectrum analysis and pulse detection on the first digital signal in response to a second control signal to obtain a first frequency domain signal, perform frequency band spectrum analysis and pulse detection on the second digital signal in response to a second control signal to obtain a second frequency domain signal, and feed back the first digital signal, the second digital signal, the first frequency domain signal, and the second frequency domain signal to the control and analysis module.

[0010] Optionally, the signal conditioning module includes an integrator unit, a filter network unit, a gain amplification unit, and an output impedance matching unit; The integrator circuit unit is used to perform time-domain integration on the first electrical signal and the second electrical signal to obtain the field strength time-domain signal. The filtering network unit is used to filter the field strength time domain signal to obtain the filtered field strength time domain signal. The gain amplification unit is used to amplify the filtered field strength time-domain signal to obtain the amplified field strength time-domain signal. The output impedance matching unit is used to perform output impedance matching on the amplified field strength time-domain signal to obtain the first analog signal and the second analog signal.

[0011] Optionally, the signal acquisition and processing module includes an analog-to-digital conversion circuit and a processor; The analog-to-digital conversion circuit is used to digitally sample the first analog signal to obtain a first digital signal, digitally sample the second analog signal to obtain a second digital signal, and feed the first digital signal and the second digital signal back to the control and analysis module. The processor is configured to perform frequency band spectrum analysis and pulse detection on the first digital signal in response to the second control signal to obtain a first frequency domain signal, and to perform frequency band spectrum analysis and pulse detection on the second digital signal in response to the second control signal to obtain a second frequency domain signal, and to feed back the first frequency domain signal and the second frequency domain signal to the control and analysis module.

[0012] Optionally, the processor is configured to, in response to a second control signal, divide the first digital signal and the second digital signal into multiple sub-frequency band signals, perform zero-IF, anti-aliasing filtering, and downsampling processing on the current sub-frequency band signal to obtain a downsampled signal, perform Fourier transform on the downsampled signal to obtain the frequency domain signal corresponding to the current sub-frequency band signal, and concatenate the frequency domain signals corresponding to the multiple sub-frequency band signals to obtain a first frequency domain signal and a second frequency domain signal.

[0013] Optionally, the processor is configured to determine whether the signal amplitude of the first digital signal and the second digital signal exceeds a first preset threshold and whether the steepness of the rising edge exceeds a second preset threshold. If the signal amplitude exceeds the first preset threshold and the steepness of the rising edge exceeds the second preset threshold, the frequency band spectrum analysis is stopped, and after performing Fourier transform on the first digital signal and the second digital signal to obtain the frequency domain signal of the full frequency band, the frequency band spectrum analysis is continued.

[0014] Optionally, the control and analysis module is used to perform pulse statistics and radiation characteristic evaluation based on the frequency domain signal of the entire frequency band.

[0015] A second aspect of the present invention provides an automatic detection method for broadband pulsed electromagnetic fields, the method comprising: Using the control and analysis module, a first control signal is sent to the mechanical turntable structure, and a second control signal is sent to the integrated module. Utilizing a mechanical turntable structure, it responds to the first control signal and moves along a preset trajectory, while feeding back spatial angle data to the control and analysis module; Using a probe array mounted on a mechanical turntable structure, when the mechanical turntable structure moves, it senses the spatial electric field and outputs a first electrical signal that is proportional to the time derivative of the electric field strength, and senses the spatial magnetic field and outputs a second electrical signal that is proportional to the time derivative of the magnetic field strength. Using an integrated module, a first analog signal is obtained by integrating, filtering, amplifying, and impedance matching the first electrical signal; a second analog signal is obtained by integrating, filtering, amplifying, and impedance matching the second electrical signal; a first digital signal is obtained by digital sampling the first analog signal; a second digital signal is obtained by digital sampling the second analog signal; a first frequency domain signal is obtained by frequency band spectrum analysis and pulse detection of the first digital signal in response to a second control signal; a second frequency domain signal is obtained by frequency band spectrum analysis and pulse detection of the second digital signal in response to a second control signal; and the first digital signal, the second digital signal, the first frequency domain signal, and the second frequency domain signal are fed back to the control and analysis module. Using the control and analysis module, spatiotemporal correlation is performed based on the first digital signal, the second digital signal, the first frequency domain signal, the second frequency domain signal, and spatial angle data to obtain electromagnetic field radiation pattern, electromagnetic field distribution, and pulse characteristic analysis results.

[0016] The beneficial effects of this invention are as follows: The technical solution described in this invention provides a comprehensive platform specifically designed for precise testing of electric and magnetic field strengths in wireless equipment and electromagnetic radiation environments. It is capable of measuring electric field strength in the extremely low frequency (ULF) to 10 GHz band and magnetic field strength in the ULF to 2 GHz band, comprehensively covering electromagnetic radiation parameters from ULF to microwave frequencies. This system is suitable for real-time monitoring, data acquisition, and analysis of complex electromagnetic fields in various working environments, providing scientific basis and technical support for assessing electromagnetic radiation exposure levels, determining human safety risks, and formulating protective measures. It is a key tool for achieving electromagnetic safety management and ensuring occupational health and safety for personnel. Attached Figure Description

[0017] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0018] Figure 1 This diagram illustrates an automatic detection system for broadband pulsed electromagnetic fields provided in an embodiment of the present invention. Detailed Implementation

[0019] To more clearly illustrate the present invention, the following description, in conjunction with embodiments and accompanying drawings, further explains the invention. Similar components in the drawings are indicated by the same reference numerals. Those skilled in the art should understand that the specific description below is illustrative rather than restrictive and should not be construed as limiting the scope of protection of the present invention.

[0020] Currently, with the development of fields such as pulsed electromagnetic radiation, electromagnetic weapons, electromagnetic compatibility, and electromagnetic safety, the demand for testing electromagnetic field strength has gradually expanded from single low-frequency responses to the measurement of pulse signals with wide bandwidth and wide dynamic range. Especially in application scenarios such as performance evaluation of high-frequency broadband pulsed radiation sources, electromagnetic environment monitoring, transient electromagnetic effect research, and electromagnetic field safety assessment, it is usually necessary to simultaneously measure the transient changes of electric and magnetic fields and analyze the time-domain waveform, spectral characteristics, peak field strength, and energy distribution of the pulse signal.

[0021] However, current technology still suffers from the following problems: insufficient bandwidth, as most traditional probes and acquisition systems lack sufficient bandwidth, making it impossible to accurately capture the rapid changes in pulse signals (such as nanosecond-level leading edges and high-frequency oscillations); lack of real-time analysis capabilities, as most systems only acquire waveforms and cannot achieve real-time FFT processing to obtain spectral data; low automation, with direction finding relying on manual labor and lacking linkage with mechanical turntables and synchronized angle recording; and poor system integration, as traditional electromagnetic field testing systems are large, costly, and have poor synchronization, making them unsuitable for automated testing and inefficient.

[0022] Therefore, a highly integrated, high-bandwidth, and high-speed processing automated testing system is needed to achieve automated scanning, real-time acquisition, and spectrum analysis of broadband pulse electromagnetic fields.

[0023] In view of this, one embodiment of the present invention provides an automatic detection system for broadband pulsed electromagnetic fields. The system includes: a control and analysis module for sending a first control signal to a mechanical turntable structure and a second control signal to an integrated module; a mechanical turntable structure for moving according to a preset trajectory in response to the first control signal and feeding back spatial angle data to the control and analysis module; a probe group disposed on the mechanical turntable structure for sensing a spatial electric field and outputting a first electrical signal proportional to the time derivative of the electric field strength, and sensing a spatial magnetic field and outputting a second electrical signal proportional to the time derivative of the magnetic field strength when the mechanical turntable structure moves; and an integrated module for integrating, filtering, amplifying, and impedance matching the first electrical signal to obtain a first analog signal, and integrating the second electrical signal to obtain a second analog signal. The first analog signal is integrated, filtered, amplified, and impedance matched to obtain a second analog signal. The first analog signal is digitally sampled to obtain a first digital signal. The second analog signal is digitally sampled to obtain a second digital signal. In response to a second control signal, the first digital signal is subjected to frequency band spectrum analysis and pulse detection to obtain a first frequency domain signal. In response to a second control signal, the second digital signal is subjected to frequency band spectrum analysis and pulse detection to obtain a second frequency domain signal. The first digital signal, the second digital signal, the first frequency domain signal, and the second frequency domain signal are fed back to the control and analysis module. The control and analysis module is also used to perform spatiotemporal correlation based on the first digital signal, the second digital signal, the first frequency domain signal, the second frequency domain signal, and spatial angle data to obtain electromagnetic field radiation pattern, electromagnetic field distribution, and pulse characteristic analysis results.

[0024] In a specific example, this embodiment is based on the automated acquisition and real-time spectrum analysis of broadband pulsed electromagnetic radiation signals. Through the probe group and mechanical turntable structure, signal conditioning module, signal acquisition and processing module, and control and analysis module, it realizes the synchronous acquisition, automatic scanning and real-time spectrum analysis of electric field pulse signals from extremely low frequency to 10 GHz and magnetic field pulse signals from extremely low frequency to 2 GHz.

[0025] In a specific example, this invention achieves accurate measurement of transient and steady-state electromagnetic fields based on the direct antenna induction method. The core testing principle is to linearly convert the electromagnetic field intensity in space into a voltage signal proportional to its time derivative using high-bandwidth, fast-response electric and magnetic field probes. Subsequently, the signal conditioning module restores this differential signal to a real time-domain waveform proportional to the original field strength through a hardware integrator circuit, and performs filtering and other conditioning to meet the back-end acquisition requirements. The conditioned signal enters the receiver, is digitally sampled by a high-speed ADC, and sent to the FPGA for real-time processing, including fast Fourier transform and pulse parameter extraction, thereby simultaneously acquiring the time-domain characteristics and frequency-domain distribution of the electromagnetic pulse. The entire testing process is coordinated by the control and analysis module, combined with the spatial angle information provided by the high-precision mechanical turntable, ultimately realizing the integrated and automatic measurement and analysis of the pulse electromagnetic field intensity, spectral characteristics, and three-dimensional spatial distribution.

[0026] In a specific example, the core components of the system include a probe assembly and mechanical turntable structure, a signal conditioning module, a signal acquisition and processing module, and a control and analysis module. The probe assembly and mechanical turntable structure are responsible for free field strength measurement and spatial pointing control; the signal conditioning module is responsible for the integration and restoration of the probe output signal and noise filtering; the signal acquisition and processing module is responsible for high-speed digitization and real-time FFT processing; and the control and analysis module is responsible for overall system control, task scheduling, data integration, and analysis.

[0027] In a specific example, the present invention consists of a probe group, a signal conditioning module, a signal acquisition and processing module, a control and analysis module, and a turntable mechanical structure. The data flow and control relationships between the modules are as follows: Figure 1 As shown.

[0028] Furthermore, the probe assembly includes three independent probe channels, each equipped with a dedicated balun. Through frequency band combination, ultra-wideband coverage is achieved. The electric field probe (1GHz) + balun is responsible for sensing electric field signals in the extremely low frequency to 1GHz band; the electric field probe (10GHz) + balun is responsible for sensing electric field signals in the 1GHz to 10GHz band; the two electric field probes work together to achieve full electric field band coverage from extremely low frequency to 10GHz; the magnetic field probe (2GHz) + balun is responsible for sensing magnetic field signals in the extremely low frequency band of approximately 2GHz. All probes are mechanically fixed to a three-axis turntable below, rotating synchronously with the turntable. The core function of the probes is to convert the spatial electromagnetic field into a differential electrical signal proportional to the time derivative of the field strength, with the balun performing the differential signal to single-ended conversion.

[0029] Furthermore, the mechanical turntable structure consists of two parts: a fixed device and a three-axis mechanical turntable. The fixed device is used for mechanical installation and fixing of the probe assembly, ensuring rigid synchronization between the probe and the turntable. The three-axis mechanical turntable has three degrees of freedom of rotation: azimuth, pitch, and roll, driving the probe to complete full-space angle scanning. The interaction logic receives control commands (rotation angle, scanning trajectory, running speed) from the control and analysis module, and simultaneously transmits real-time angle feedback data back to the host computer via an encoder.

[0030] Furthermore, the signal conditioning module includes three integration and filtering circuits that correspond one-to-one with the probe. The channels are designed independently to prevent interference. The core function is to receive the single-ended signal output by the probe, first use the integration circuit to convert the differential signal in the form of the field strength change rate into a time-domain waveform that is proportional to the original field strength, and then use the filtering circuit to suppress out-of-band noise and eliminate DC bias to output a regular analog signal.

[0031] Furthermore, the integrated design of the signal acquisition and processing module encapsulates the signal conditioning module within this module. Both utilize an integrated hardware design, shortening the signal path and improving synchronization and integration. Internally, the module consists of a two-stage multi-channel high-speed ADC that receives three conditioned analog signals and simultaneously performs high-speed digital sampling, converting continuous analog waveforms into discrete digital signals. The FPGA is the core of the acquisition and processing module, receiving the digital sampling data from the ADC and performing real-time spectrum analysis and pulse detection based on ZoomFFT. The interactive logic transmits the calculated spectrum data (including time-domain data) back to the host computer; simultaneously, it receives control commands (sampling parameters, frequency band configuration, FFT parameters, etc.) from the host computer.

[0032] Furthermore, the control and analysis module serves as the control center and data analysis terminal of the entire system, i.e., the host computer platform. Core interactions include sending acquisition and analysis parameters to the signal acquisition and processing module, receiving spectrum and time-domain data; sending motion control commands to the three-axis mechanical turntable, and receiving angle feedback data; core processing includes spatiotemporally linking and binding field strength data and angle data at the same moment to complete three-dimensional field distribution reconstruction, radiation pattern synthesis, pulse characteristic analysis, result visualization, and report generation.

[0033] Furthermore, the forward signal link from electromagnetic field to digital result involves spatial electromagnetic field sensing by three probes, outputting a differential electrical signal proportional to the time derivative of the field strength, balun conversion to single-ended signal, integration and filtering circuit of corresponding channel to complete integration and noise reduction, multi-channel high-speed ADC synchronous digital sampling, FPGA execution of real-time spectrum analysis and pulse detection, and uploading of spectrum time domain data to host computer platform.

[0034] Furthermore, the reverse control and linkage link, from the central control to automatic scanning, uniformly schedules and sends test parameters (sampling rate, scanning frequency band, frequency resolution, trigger conditions, etc.) to the FPGA, controlling the acquisition and spectrum analysis process; it sends motion commands (scanning angle range, step, continuous mode, rotation speed) to the three-axis turntable, controlling the spatial pointing of the probe; it synchronously receives field strength data and angle data, completes spatiotemporal correlation based on a unified timestamp, and finally synthesizes two-dimensional and three-dimensional electromagnetic field radiation patterns, reconstructs the spatial field distribution, and outputs visualization results and test reports.

[0035] The technical solution described in this invention provides a comprehensive platform specifically designed for precise testing of electric and magnetic field strengths in wireless equipment and electromagnetic radiation environments. It is capable of measuring electric field strength in the extremely low frequency (ULF) to 10 GHz band and magnetic field strength in the ULF to 2 GHz band, comprehensively covering electromagnetic radiation parameters from ULF to microwave frequencies. This system is suitable for real-time monitoring, data acquisition, and analysis of complex electromagnetic fields in various working environments, providing scientific basis and technical support for assessing electromagnetic radiation exposure levels, determining human safety risks, and formulating protective measures. It is a key tool for achieving electromagnetic safety management and ensuring occupational health and safety for personnel.

[0036] In one possible implementation, the probe group includes an electric field probe and a first balun, a magnetic field probe and a second balun; the electric field probe is used to sense a spatial electric field and output a first differential electrical signal proportional to the time derivative of the electric field strength; the first balun is used to convert the first differential signal into a first electrical signal; the magnetic field probe is used to sense a spatial magnetic field and output a second differential electrical signal proportional to the time derivative of the magnetic field strength; the second balun is used to convert the second differential signal into a second electrical signal.

[0037] This embodiment employs a symmetrical differential structure electric and magnetic field probes in conjunction with a dedicated balun. On one hand, the differential sensing structure effectively suppresses spatial common-mode electromagnetic interference, significantly improving the signal-to-noise ratio of weak field strength signals and ensuring measurement accuracy in strong electromagnetic environments. On the other hand, the balun performs the conversion of balanced differential signals to single-ended signals, adapting to standard coaxial transmission links while achieving impedance matching, reducing signal reflection and transmission loss, ensuring the integrity of signal transmission over a wide bandwidth, and providing a high-fidelity signal foundation for high-precision analysis at the back end.

[0038] In one possible implementation, the mechanical turntable structure includes a three-axis mechanical turntable, a motor, a drive controller, and an encoder; the drive controller is used to generate a drive signal according to a first control signal; the motor is used to rotate in response to the drive signal; the three-axis mechanical turntable is used to move when the motor rotates; and the encoder is used to feed back the spatial angle data of the probe group to the control and analysis module.

[0039] In a specific example, the probe array consists of broadband electric field probes and broadband magnetic field probes, each equipped with a dedicated high-performance balun. All probes and baluns are mounted on a three-axis rotary table, whose rotational directions are defined by azimuth, pitch, and roll axes, and is equipped with precision stepper motors, encoders, and drive controllers. Signals are led out from the balun outputs via low-loss shielded coaxial cables and transmitted to subsequent processing modules.

[0040] In a specific example, the probe induces a weak differential signal in an electromagnetic field that is proportional to the strength of the electric or magnetic field. Specifically, the electric field probe employs a free-field symmetrical dual-channel structure, where the output voltage of each channel is proportional to the time derivative of the electric field strength, expressed as:

[0041] in, This is the instantaneous output voltage of a single channel of the electric field probe; For time; It is a subscript; It is a single-channel impedance (typically 50Ω). This represents the equivalent total area of ​​the probe. The vacuum permittivity, denoted as electric field strength.

[0042] Furthermore, the magnetic field probe also adopts a symmetrical dual-channel structure, and its output voltage is proportional to the time derivative of the magnetic field strength, expressed as:

[0043] in, Instantaneous output voltage of a single channel of a magnetic field probe; This represents the equivalent total area of ​​the probe. The permeability of free space, denoted as , where is the magnetic field strength.

[0044] Furthermore, the balun converts the differential signal into a single-ended signal to enhance anti-interference capabilities and adapt to long-distance transmission. The mechanical turntable rotates continuously or in steps in three dimensions—azimuth, pitch, and roll—according to instructions from the host computer platform, with the encoder providing real-time angle feedback. The system synchronously records the angle information and corresponding electromagnetic field signal at each moment, achieving a precise correlation between the spatial distribution of the electromagnetic field and the angle information.

[0045] Furthermore, the frequency range covers extremely low frequencies from 10 GHz for the electric field probe and from 2 GHz for the magnetic field probe. Angle control accuracy is 0.1° resolution, with a repeatability error of less than 0.2°. Scanning freedom is omnidirectional across three axes, supporting customizable scanning trajectories and speeds. Mechanical load capacity is ≥5 kg, with good structural rigidity and low operating vibration. Environmental adaptability is suitable for laboratory, field, and complex electromagnetic environments.

[0046] This embodiment employs a three-axis mechanical turntable with drive and encoder components, enabling omnidirectional scanning in three dimensions: azimuth, pitch, and roll, covering the complete spatial angle range and adapting to the spatial field distribution testing requirements of radiation sources of different shapes. The encoder provides real-time feedback of high-precision angle data, ensuring accurate time synchronization between the field strength signal and the spatial angle, thus improving the reconstruction accuracy of subsequent electromagnetic field radiation patterns and spatial field distributions. The integrated drive and control design enhances the stability and response speed of the turntable motion, supports custom scanning trajectories, and can adapt to diverse testing scenarios such as fixed-point testing and continuous scanning.

[0047] In one possible implementation, the integrated module includes a signal conditioning module and a signal acquisition and processing module; the signal conditioning module is used to integrate, filter, amplify, and impedance match a first electrical signal to obtain a first analog signal, and to integrate, filter, amplify, and impedance match a second electrical signal to obtain a second analog signal; the signal acquisition and processing module is used to digitally sample the first analog signal to obtain a first digital signal, digitally sample the second analog signal to obtain a second digital signal, perform frequency band spectrum analysis and pulse detection on the first digital signal in response to a second control signal to obtain a first frequency domain signal, perform frequency band spectrum analysis and pulse detection on the second digital signal in response to the second control signal to obtain a second frequency domain signal, and feed back the first digital signal, the second digital signal, the first frequency domain signal, and the second frequency domain signal to the control and analysis module.

[0048] This embodiment integrates the signal conditioning module and the signal acquisition and processing module into a single module, which can significantly shorten the transmission path of analog signals, reduce noise interference and signal attenuation introduced by long-distance wiring, and improve the measurement accuracy of weak signals. At the same time, the two modules work together within the same hardware architecture, which can ensure strict synchronization between the signal conditioning timing and the sampling clock, and improve the consistency of multi-channel measurements. The modular functional division not only ensures integration, but also facilitates subsequent channel expansion and hardware maintenance, taking into account both system integration and scalability.

[0049] In one possible implementation, the signal conditioning module includes an integrator unit, a filter network unit, a gain amplification unit, and an output impedance matching unit. The integrator unit is used to integrate the first electrical signal and the second electrical signal in the time domain to obtain a field strength time domain signal. The filter network unit is used to filter the field strength time domain signal to obtain a filtered field strength time domain signal. The gain amplification unit is used to amplify the filtered field strength time domain signal to obtain an amplified field strength time domain signal. The output impedance matching unit is used to perform output impedance matching on the amplified field strength time domain signal to obtain a first analog signal and a second analog signal.

[0050] In a specific example, the signal conditioning module consists of multi-channel independent integrator circuits, filter networks, gain amplifiers, and output stage impedance matching drive circuits. Each channel adopts a modular design, with independent power management and signal processing links, and supports channel expansion capabilities.

[0051] In a specific example, the module receives a single-ended signal from the probe group after balun conversion. First, it performs time-domain integration on the signal using an integrator circuit, restoring the differential signal output by the probe (proportional to the rate of change of the electromagnetic field) to a true time-domain waveform proportional to the original field strength. The signal then enters a filter network, undergoing low-pass or high-pass filtering according to preset frequency band requirements to effectively suppress out-of-band noise and eliminate DC bias. After filtering, the signal enters a gain adjustment stage, where an amplifier adjusts the signal amplitude to the optimal dynamic range suitable for subsequent acquisition modules. Finally, the signal is buffered and impedance-matched via a low-output-impedance drive circuit to ensure signal integrity and stability during transmission to the acquisition module over long distances via cable.

[0052] In a specific example, the integration accuracy is less than ±1% linearity error within the effective bandwidth. The output characteristics are an output impedance of 50Ω, a voltage standing wave ratio of less than 1.5, an output signal amplitude range of ±5V, and harmonic distortion of less than -60dBc.

[0053] This embodiment employs a four-stage independent signal conditioning chain: integration, filtering, gain amplification, and impedance matching. The integration circuit can accurately restore the differential signal output by the probe to the true field strength time-domain waveform, ensuring the fidelity of the pulse signal's time-domain characteristics. The filtering network can flexibly filter out out-of-band noise and DC bias, improving signal purity. The gain amplification unit can adapt to field strength signals of different intensities, broadening the system's dynamic measurement range. The output impedance matching unit can ensure that the signal impedance is consistent with that of the back-end acquisition equipment, reducing signal reflection distortion and ensuring the accuracy of the signal waveform and amplitude after long-distance transmission.

[0054] In one possible implementation, the signal acquisition and processing module includes an analog-to-digital converter circuit and a processor; the analog-to-digital converter circuit is used to digitally sample a first analog signal to obtain a first digital signal, and digitally sample a second analog signal to obtain a second digital signal, and feed the first digital signal and the second digital signal back to the control and analysis module; the processor is used to perform frequency band spectrum analysis and pulse detection on the first digital signal in response to a second control signal to obtain a first frequency domain signal, and to perform frequency band spectrum analysis and pulse detection on the second digital signal in response to the second control signal to obtain a second frequency domain signal, and feed the first frequency domain signal and the second frequency domain signal back to the control and analysis module.

[0055] In a specific example, the signal acquisition and processing module (receiver) consists of a multi-channel high-speed analog-to-digital converter (ADC), a field-programmable gate array (FPGA) processing core, a high-speed synchronous clock circuit, a large-capacity buffer unit, and a high-speed data interface. The ADC array employs a three-channel parallel architecture, with each channel using a 12-bit resolution high-speed ADC chip capable of a maximum sampling rate of 40 GS / s. The FPGA internally houses a multi-channel down-conversion (DDC) processing chain, each containing a numerically controlled oscillator (NCO), a mixer, a programmable decimation filter bank, and a dedicated FFT calculation module. The system is equipped with a precision clock distribution circuit and a trigger synchronization module to ensure strict synchronization of sampling across multiple channels.

[0056] In a specific example, this module employs a programmable frequency band scanning analysis strategy based on the ZoomFFT principle to achieve high-resolution spectrum measurement across the entire frequency band from extremely low frequencies to 10 GHz (electric field) and from extremely low frequencies to 2 GHz (magnetic field). Its workflow is as follows: frequency band planning and parameter distribution: the user sets the total frequency band range to be scanned, sub-band bandwidth, frequency resolution, and scan step size in the host computer software. The control module converts the scan sequence into a series of digital down-conversion parameters (including center frequency, decimation factor, filter coefficients, etc.) and distributes them to the FPGA in real time.

[0057] Furthermore, the frequency-band digital downconversion and downsampling FPGA configures a numerically controlled oscillator to generate a corresponding local oscillator signal based on the center frequency of the current scanning band, mixing the target sub-band to zero intermediate frequency. Subsequently, an anti-aliasing filter chain is used to perform anti-aliasing filtering and downsampling on the signal, reducing the data rate to a low speed that matches the sub-band bandwidth.

[0058] Furthermore, high-resolution ZoomFFT performs a multi-point FFT on the downsampled low-speed data stream to obtain a high-resolution spectrum within the current sub-band. By dynamically adjusting the number of FFT points and the window function, the computational load of the FFT is kept within the real-time processing capabilities of the FPGA while maintaining high resolution.

[0059] Furthermore, the FPGA performs full-band scanning and synthesis, completing the spectrum analysis of one sub-band within milliseconds. It then immediately switches to the next adjacent sub-band, repeating steps 2-3 until the entire scan range set by the user is covered. The spectrum results of all sub-bands are stitched and calibrated on the host computer, ultimately generating a full-band, high-resolution spectrum map covering electric fields from extremely low frequencies to 10 GHz and magnetic fields from extremely low frequencies to 2 GHz.

[0060] Furthermore, regarding pulse monitoring and triggering, during the frequency band scanning process, the system runs a high-speed pulse detection algorithm in parallel. Once a transient pulse is detected, the current scanning sequence can be immediately interrupted, switching to full-bandwidth acquisition mode to perform high-sampling capture and high-resolution spectral analysis of the pulse signal.

[0061] In a specific example, the sampling performance is a maximum sampling rate of 40 Gs / s (sampling parameters can be configured via software), 12-bit resolution; synchronization accuracy is less than 5 ps for multi-channel sampling synchronization error and less than 2 ps RMS for trigger jitter. Real-time spectrum analysis capability supports ZoomFFT analysis, with sub-band bandwidth adjustable from 10-100 MHz and frequency resolution up to 0.1 kHz.

[0062] This embodiment separates analog-to-digital conversion and processing operations into independent units. The high-speed analog-to-digital conversion circuit can focus on achieving high sampling rate and high resolution signal digitization, fully capturing the leading edge and detailed features of nanosecond-level pulses. The dedicated processor independently undertakes spectrum analysis and pulse detection operations, enabling hardware-level real-time data processing, reducing the computational burden on the host computer, and improving the overall system response speed. The time-domain digital signal and frequency-domain signal are transmitted separately, which can simultaneously meet the dual testing requirements of original waveform storage and real-time spectrum analysis, supporting multi-dimensional electromagnetic field characteristic analysis.

[0063] In one possible implementation, the processor is configured to, in response to a second control signal, divide a first digital signal and a second digital signal into multiple sub-frequency band signals, perform zero-IF, anti-aliasing filtering, and downsampling processing on the current sub-frequency band signal to obtain a downsampled signal, perform Fourier transform on the downsampled signal to obtain a frequency domain signal corresponding to the current sub-frequency band signal, and concatenate the frequency domain signals corresponding to the multiple sub-frequency band signals to obtain a first frequency domain signal and a second frequency domain signal.

[0064] This embodiment employs a process of frequency-band downconversion, downsampling, and segmented FFT re-stitching. This approach achieves both ultra-wideband coverage and extremely high frequency resolution within limited hardware computing and storage resources, resolving the technical contradiction of direct full-band FFT failing to balance bandwidth and resolution. Zero-IF downconversion and decimation downsampling significantly reduce the data rate and improve FFT computation efficiency, enabling microsecond-level real-time spectrum analysis. The sub-band stitching method flexibly adapts to different test bandwidth requirements, ensuring the continuity and calibration accuracy of the final full-band spectrum.

[0065] In one possible implementation, the processor is configured to determine whether the signal amplitude of the first digital signal and the second digital signal exceeds a first preset threshold and whether the steepness of the rising edge exceeds a second preset threshold. If the signal amplitude exceeds the first preset threshold and the steepness of the rising edge exceeds the second preset threshold, the frequency band spectrum analysis is stopped, and after performing Fourier transform on the first digital signal and the second digital signal to obtain the frequency domain signal of the full frequency band, the frequency band spectrum analysis continues.

[0066] This embodiment employs a pulse determination mechanism with dual thresholds for signal amplitude and rising edge steepness, which can accurately identify transient pulse signals and effectively reduce the probability of false triggering caused by environmental interference. After pulse triggering, the conventional frequency band scanning is automatically interrupted and switched to full bandwidth acquisition mode, which can ensure that a single, unreproducible transient pulse is completely captured, avoiding the loss of critical test data. After pulse acquisition is completed, the conventional frequency sweep process is automatically restored, realizing the parallel consideration of steady-state wideband spectrum monitoring and high-precision transient pulse acquisition, which greatly improves the system's adaptability to complex test scenarios.

[0067] In one possible implementation, the control and analysis module is used to perform pulse statistics and radiation characteristic evaluation based on the frequency domain signal across the entire frequency band.

[0068] In a specific example, the control and analysis module consists of an industrial-grade computer hardware platform, a high-resolution graphics display unit, and a dedicated measurement and control software system. The software system adopts a modular architecture, including a device driver layer, a real-time control layer, a data processing layer, and a human-machine interaction layer, supporting distributed deployment and remote access capabilities.

[0069] In a specific example, this module serves as the control core and data analysis terminal of the entire testing system. It interacts with the FPGA processing module via high-speed Ethernet and synchronizes commands with the mechanical turntable via a RS-232 interface. Upon system startup, the main control software automatically identifies and initializes all hardware devices. Operators can configure test parameters, including sampling rate, trigger conditions, and scan trajectory, through a graphical interface. During testing, the control and analysis module issues frequency-band scanning commands in real time and receives time-domain characteristic information, spectrum data, and turntable angle information from the data acquisition and processing module, establishing spatiotemporal correlations in the built-in database. The data analysis module can perform multi-task processing in parallel, including real-time three-dimensional electromagnetic field distribution reconstruction, pulse sequence statistical analysis, radiation pattern synthesis, and radiation characteristic evaluation. All analysis results are dynamically presented through the visualization module, supporting data export, automatic report generation, and abnormal event alarms.

[0070] In a specific example, the control response time is less than 5ms from software command issuance to hardware response, and the turntable motion control command parsing and execution cycle is less than 10ms. Data processing capabilities include real-time reception and processing of three-channel parallel data streams, and saving processing results to the database. Visualization performance includes real-time multi-view refresh, with 3D field distribution rendering latency less than 100ms. Report generation capabilities include automatic generation of test reports in PDF, Word, and Excel formats. Remote control support includes web-based remote monitoring and operation, allowing simultaneous management of multiple test systems, with user access control and operation log recording. System scalability includes providing standard API interfaces, supporting user-defined analysis algorithm integration and test process scripting.

[0071] In this embodiment, the control and analysis module automatically completes pulse statistics and radiation characteristic assessment based on full-bandwidth pulse spectrum data. This can replace manual calculation and analysis, improving test efficiency and the objectivity and accuracy of results. The quantified pulse characteristics and radiation assessment results can directly provide data support for electromagnetic radiation exposure level assessment, transient electromagnetic effect research, and electromagnetic safety protection scheme formulation, thereby enhancing the engineering application value of the system.

[0072] In summary, the effective advantages of this invention include, for example, ultra-wideband coverage, with electric field coverage extending to the extremely low frequency band up to 10 GHz and magnetic field coverage extending to the extremely low frequency band up to 2 GHz, far superior to the testing capabilities of traditional systems. For example, real-time spectrum analysis, with the receiver employing FPGA to implement hardware-level high-speed FFT, enabling parallel processing of large-scale data with microsecond-level latency. For example, automatic direction finding, integrating spectrum data and turntable scanning angle information at the same time, can generate two-dimensional or three-dimensional electromagnetic field patterns. For example, high system integration, with a modular design, and a closed-loop process from parameter configuration and automatic testing to result visualization via a host computer platform, significantly improving overall testing efficiency. For example, suitability for harsh radiation environments, with the receiver externally covered by a lead layer to prevent radiation interference; simultaneously, testing tasks can be remotely controlled via the host computer platform, ensuring that testing personnel are kept away from radiation environments.

[0073] Another embodiment of the present invention provides an automatic detection method for broadband pulsed electromagnetic fields. The method includes: using a control and analysis module to send a first control signal to a mechanical turntable structure and a second control signal to an integrated module; using the mechanical turntable structure to move along a preset trajectory in response to the first control signal and feeding back spatial angle data to the control and analysis module; using a probe group mounted on the mechanical turntable structure to sense a spatial electric field and output a first electrical signal proportional to the time derivative of the electric field strength, and to sense a spatial magnetic field and output a second electrical signal proportional to the time derivative of the magnetic field strength, using the integrated module to integrate, filter, amplify, and impedance match the first electrical signal to obtain a first analog signal, and to further process the second electrical signal... The process involves integration, filtering, amplification, and impedance matching to obtain a second analog signal. The first analog signal is then digitally sampled to obtain a first digital signal. The second analog signal is also digitally sampled to obtain a second digital signal. In response to a second control signal, the first digital signal undergoes frequency band spectrum analysis and pulse detection to obtain a first frequency domain signal. Similarly, the second digital signal undergoes the same frequency band spectrum analysis and pulse detection process to obtain a second frequency domain signal. These signals are then fed back to the control and analysis module. The control and analysis module then performs spatiotemporal correlation based on the first digital signal, the second digital signal, the first frequency domain signal, the second frequency domain signal, and spatial angle data to obtain the electromagnetic field pattern, electromagnetic field distribution, and pulse characteristic analysis results.

[0074] The technical solution described in this invention provides a comprehensive platform specifically designed for precise testing of electric and magnetic field strengths in wireless equipment and electromagnetic radiation environments. It is capable of measuring electric field strength in the extremely low frequency (ULF) to 10 GHz band and magnetic field strength in the ULF to 2 GHz band, comprehensively covering electromagnetic radiation parameters from ULF to microwave frequencies. This system is suitable for real-time monitoring, data acquisition, and analysis of complex electromagnetic fields in various working environments, providing scientific basis and technical support for assessing electromagnetic radiation exposure levels, determining human safety risks, and formulating protective measures. It is a key tool for achieving electromagnetic safety management and ensuring occupational health and safety for personnel.

[0075] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0076] It should also be noted that in the description of this invention, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0077] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. An automatic detection system of a wideband pulsed electromagnetic field, characterized by, The system includes: The control and analysis module is used to send a first control signal to the mechanical turntable structure and a second control signal to the integrated module. The mechanical turntable structure is used to move along a preset trajectory in response to a first control signal and to feed back spatial angle data to the control and analysis module. The probe group is set on the mechanical turntable structure and is used to sense the spatial electric field and output a first electrical signal that is proportional to the time derivative of the electric field strength when the mechanical turntable structure moves; and to sense the spatial magnetic field and output a second electrical signal that is proportional to the time derivative of the magnetic field strength. An integrated module is used to integrate, filter, amplify, and impedance match a first electrical signal to obtain a first analog signal; integrate, filter, amplify, and impedance match a second electrical signal to obtain a second analog signal; digitally sample the first analog signal to obtain a first digital signal; digitally sample the second analog signal to obtain a second digital signal; perform frequency band spectrum analysis and pulse detection on the first digital signal in response to a second control signal to obtain a first frequency domain signal; perform frequency band spectrum analysis and pulse detection on the second digital signal in response to a second control signal to obtain a second frequency domain signal; and feed back the first digital signal, the second digital signal, the first frequency domain signal, and the second frequency domain signal to the control and analysis module. The control and analysis module is also used to perform spatiotemporal correlation based on the first digital signal, the second digital signal, the first frequency domain signal, the second frequency domain signal, and spatial angle data to obtain electromagnetic field radiation patterns, electromagnetic field distribution, and pulse characteristic analysis results.

2. The automatic detection system according to claim 1, characterized in that, The probe group includes an electric field probe and a first balun, a magnetic field probe and a second balun; The electric field probe is used to sense the spatial electric field and outputs a first differential electrical signal that is proportional to the time derivative of the electric field strength. The first balun is used to convert the first differential signal into a first electrical signal; The magnetic field probe is used to sense the spatial magnetic field and outputs a second differential electrical signal that is proportional to the time derivative of the magnetic field strength. The second balun is used to convert the second differential signal into a second electrical signal.

3. The automatic detection system according to claim 2, characterized in that, The mechanical turntable structure includes a three-axis mechanical turntable, a motor, a drive controller, and an encoder; The drive controller is used to generate a drive signal based on the first control signal; The motor is used to rotate in response to a drive signal; The three-axis mechanical turntable is used to move when the motor rotates; The encoder is used to feed back the spatial angle data of the probe group to the control and analysis module.

4. The automatic detection system according to claim 3, characterized in that, The integrated module includes a signal conditioning module and a signal acquisition and processing module; The signal conditioning module is used to integrate, filter, amplify, and impedance match the first electrical signal to obtain a first analog signal, and to integrate, filter, amplify, and impedance match the second electrical signal to obtain a second analog signal. The signal acquisition and processing module is used to digitally sample a first analog signal to obtain a first digital signal, digitally sample a second analog signal to obtain a second digital signal, perform frequency band spectrum analysis and pulse detection on the first digital signal in response to a second control signal to obtain a first frequency domain signal, perform frequency band spectrum analysis and pulse detection on the second digital signal in response to a second control signal to obtain a second frequency domain signal, and feed back the first digital signal, the second digital signal, the first frequency domain signal, and the second frequency domain signal to the control and analysis module.

5. The automatic detection system according to claim 4, characterized in that, The signal conditioning module includes an integrator unit, a filter network unit, a gain amplification unit, and an output impedance matching unit. The integrator circuit unit is used to perform time-domain integration on the first electrical signal and the second electrical signal to obtain the field strength time-domain signal. The filtering network unit is used to filter the field strength time domain signal to obtain the filtered field strength time domain signal. The gain amplification unit is used to amplify the filtered field strength time-domain signal to obtain the amplified field strength time-domain signal. The output impedance matching unit is used to perform output impedance matching on the amplified field strength time-domain signal to obtain the first analog signal and the second analog signal.

6. The automatic detection system according to claim 5, characterized in that, The signal acquisition and processing module includes an analog-to-digital conversion circuit and a processor; The analog-to-digital conversion circuit is used to digitally sample the first analog signal to obtain a first digital signal, digitally sample the second analog signal to obtain a second digital signal, and feed the first digital signal and the second digital signal back to the control and analysis module. The processor is configured to perform frequency band spectrum analysis and pulse detection on the first digital signal in response to the second control signal to obtain a first frequency domain signal, and to perform frequency band spectrum analysis and pulse detection on the second digital signal in response to the second control signal to obtain a second frequency domain signal, and to feed back the first frequency domain signal and the second frequency domain signal to the control and analysis module.

7. The automatic detection system according to claim 6, characterized in that, The processor is configured to, in response to a second control signal, divide a first digital signal and a second digital signal into multiple sub-frequency band signals, perform zero-IF, anti-aliasing filtering, and downsampling processing on the current sub-frequency band signal to obtain a downsampled signal, perform Fourier transform on the downsampled signal to obtain the frequency domain signal corresponding to the current sub-frequency band signal, and concatenate the frequency domain signals corresponding to the multiple sub-frequency band signals to obtain a first frequency domain signal and a second frequency domain signal.

8. The automatic detection system according to claim 7, characterized in that, The processor is used to determine whether the signal amplitude of the first digital signal and the second digital signal exceeds a first set threshold and whether the steepness of the rising edge exceeds a second set threshold. If the signal amplitude exceeds the first set threshold and the steepness of the rising edge exceeds the second set threshold, the frequency band spectrum analysis is stopped. After performing Fourier transform on the first digital signal and the second digital signal to obtain the frequency domain signal of the full frequency band, the frequency band spectrum analysis continues.

9. The automatic detection system according to claim 8, characterized in that, The control and analysis module is used to perform pulse statistics and radiation characteristic evaluation based on the frequency domain signal of the entire frequency band.

10. An automatic detection method of a wideband pulsed electromagnetic field, characterized by, The method includes: Using the control and analysis module, a first control signal is sent to the mechanical turntable structure, and a second control signal is sent to the integrated module. Utilizing a mechanical turntable structure, it responds to the first control signal and moves along a preset trajectory, while feeding back spatial angle data to the control and analysis module; Using a probe array mounted on a mechanical turntable structure, when the mechanical turntable structure moves, it senses the spatial electric field and outputs a first electrical signal that is proportional to the time derivative of the electric field strength, and senses the spatial magnetic field and outputs a second electrical signal that is proportional to the time derivative of the magnetic field strength. Using an integrated module, a first analog signal is obtained by integrating, filtering, amplifying, and impedance matching the first electrical signal; a second analog signal is obtained by integrating, filtering, amplifying, and impedance matching the second electrical signal; a first digital signal is obtained by digital sampling the first analog signal; a second digital signal is obtained by digital sampling the second analog signal; a first frequency domain signal is obtained by frequency band spectrum analysis and pulse detection of the first digital signal in response to a second control signal; a second frequency domain signal is obtained by frequency band spectrum analysis and pulse detection of the second digital signal in response to a second control signal; and the first digital signal, the second digital signal, the first frequency domain signal, and the second frequency domain signal are fed back to the control and analysis module. Using the control and analysis module, spatiotemporal correlation is performed based on the first digital signal, the second digital signal, the first frequency domain signal, the second frequency domain signal, and spatial angle data to obtain electromagnetic field radiation pattern, electromagnetic field distribution, and pulse characteristic analysis results.

Images