34 results about "Direct digital synthesizer" patented technology

The invention discloses a micro meteorological change real-time monitoring method based on a millimeter wave radar, and relates to the technical field of meteorological monitoring. The method comprises the following steps: carrying out dynamic acquisition on millimeter wave radar signals and carrying out coordinate system conversion; converting the converted information into a programmable chirp signal through a DDS (Direct Digital Synthesizer) chip; performing space-time adaptive filtering processing on the received signal to eliminate interference; abnormal phase points are detected, and a dynamic noise base model is established; inputting the preprocessed phase data into a pre-trained DPGN network, and outputting a weather result map; a lightweight engine is deployed at a radar end to process the weather result map; when it is detected that the weather gradient exceeds a threshold value, weather early warning is triggered. The adaptive chirp waveform modulation is adopted, the frequency slope and the pulse width of the radar transmitting signal are dynamically adjusted according to the real-time environmental noise level, the meteorological monitoring sensitivity and the small change detection efficiency are improved, and the environmental noise interference is optimized.

The invention provides a vector signal source and a design method thereof, which can be applied to the technical field of communication. The vector signal source comprises: a generation module comprising a plurality of parallel direct digital synthesizers, the generation module being configured to generate a plurality of target digital signals based on drive clock signals corresponding to the plurality of direct digital synthesizers, the driving clock signals respectively corresponding to the plurality of direct digital synthesizers have phase differences relative to each other and are equal in frequency; the conversion module comprises a plurality of digital-to-analog converters electrically connected with the plurality of direct digital synthesizers respectively, and the conversion module is configured to convert the received multiple paths of target digital signals into multiple paths of target analog signals respectively based on sampling clock signals corresponding to the multiple digital-to-analog converters respectively, the sampling clock signals corresponding to the plurality of digital-to-analog converters are synchronized relative to each other; and the synthesis module is configured to integrate the multiple paths of target analog signals according to a time sequence to obtain a target vector signal source.

In one example, an RF oscillator system includes a laser source configured to emit laser light, a housing, a crystalline microresonator disposed within the housing, and a photonic integrated circuit disposed within the housing, the photonic integrated circuit including an optical waveguide network and configured to generate a clock signal based on the laser light. The RF oscillator system may further include at least one photonic wirebond configured to couple the laser light between the optical waveguide network and the crystalline microresonator via evanescent coupling; laser control circuitry disposed within the housing and configured to lock a frequency of the laser light to a resonance of the microresonator to generate the clock signal; and a direct digital synthesizer disposed within the housing and configured to produce a tunable oscillator signal based on the clock signal.

This high-frequency signal generation device is provided with: (A) a clock signal generation unit that generates a clock signal using a harmonic component generated by an amplifier having nonlinearity; (B) a direct digital synthesizer (DDS) that generates a frequency signal having a frequency set by the frequency setting data, using the clock signal as a system clock for operating the internal processing; and (C) a frequency-increasing unit that is configured from a non-active frequency multiplier that does not use an active element, and that increases the frequency of the frequency signal generated by the DDS. A clock signal is generated using a harmonic component generated by an amplifier having nonlinearity, and in a frequency variable function, a delay time is shortened to cope with a high speed, and spurious and phase noise are suppressed to cope with a high C / N ratio.

The invention discloses a wire adhesion detection circuit and a metal wire bonding machine, and the circuit comprises a capacitance-resistance oscillation circuit which is connected with a power supply end, a metal wire connection end of a to-be-detected device and a material sheet connection end, and outputs a first oscillation signal according to a preset impedance value and a first impedance value between the metal wire connection end and the material sheet connection end; the waveform processing circuit is connected with the capacitance-resistance oscillation circuit and converts the first oscillation signal into a first square wave signal; the signal processing circuit is connected with the waveform processing circuit, and the wire bonding state, namely the connection state between the metal lead and the material sheet, the connection state between the metal frame on the material sheet and the wafer, is obtained according to the signal parameters of the first square wave signal, so that high-cost devices such as a DDS (Direct Digital Synthesizer), a DAC (Digital-to-Analog Converter), an ADC (Analog-to-Digital Converter) and an RMS-DC converter are completely omitted; the method can be realized only by adopting the capacitance-resistance oscillation circuit, the waveform processing circuit and the signal processing circuit which are low in cost, the hardware cost is reduced, and the detection delay is only one or more cycles of the first square wave signal and is reduced from the millisecond level to the microsecond level.

The invention relates to the technical field of automotive electronics and communication, and provides a DDS (Direct Digital Synthesizer)-based safety vehicle-mounted communication method, which comprises the following steps of: dividing whole vehicle data into non-safety data, periodic safety data and non-periodic safety data; establishing a communication channel for each type of data; for a non-periodic transmission channel, a special protection scheme is adopted, and a communication failure mode is detected: a sender configures a life cycle for data, and after the data is sent, the life cycle is monitored; when the data is discarded due to exceeding the life cycle, the sender updates the life overrun state; the receiver replies based on an ACK / NACK mechanism, and the sender updates the service life overrun state when the time is out and the confirmation is not carried out; arranging a monitor at a receiver, and detecting a communication failure event of data loss when the monitor monitors a service life overrun state; when a communication failure is detected, the communication management middleware notifies the security application. The invention aims to solve the problems that data protection is not distinguished and non-periodic data cannot be effectively detected in an existing scheme.

The present application relates to a kind of multi-mode noise interference signal generation method, belong to signal interference technical field, solve the problem that existing cannot dynamically flexibly generate the interference signal of multiple modulation modes and the high development complexity.For method includes: according to noise kind and interference mode, obtain first noise sequence, second noise sequence, third noise sequence, noise interference bandwidth and center frequency;Carrier signal is generated based on center frequency;First noise sequence and noise interference bandwidth are passed into first multiplier, then the output result and carrier signal are passed into adder, and first complex signal is output by direct digital synthesizer;First complex signal and second noise sequence are passed into complex multiplier, and second complex signal is output;Second complex signal and third noise sequence are passed into second multiplier, and noise interference signal is output.The generation of multi-mode noise interference signal dynamically flexibly is realized.

This invention discloses a segmented quadrupole system incorporating phase control, comprising a segmented quadrupole structure, a direct digital synthesizer, a first phase shifting device, a second phase shifting device, a first radio frequency high voltage output device, and a second radio frequency high voltage output device. Compared to traditional quadrupole systems that increase radio frequency high voltage and frequency, this invention achieves high resolution while reducing electrical noise and power loss in the radio frequency system and improving power supply control accuracy, as it eliminates the need to increase high voltage and frequency. This results in higher instrument reliability while maintaining high resolution. By dividing the long quadrupole into multiple short segments—at least one first quadrupole and at least one second quadrupole—the manufacturing precision requirements for single-segment quadrupole electrodes are effectively reduced, simplifying the manufacturing process, improving overall mechanical stability, and minimizing the impact of thermal deformation and mechanical vibration on mass spectrometer performance.

The invention discloses a low-speed speed measurement method for a sine frequency modulation Doppler radar, and mainly solves the problems that the existing debugging test is complicated, and the speed measurement cannot be carried out due to easy lock losing during low-speed flight. The implementation scheme comprises the following steps: determining side frequency times, a modulation index and a modulation frequency; a DDS is used for digitally synthesizing a sine frequency modulation signal, the sine frequency modulation signal is mixed with a local oscillator signal generated by a PLL to generate a radio frequency sine frequency modulation signal, and the radio frequency sine frequency modulation signal is transmitted to specific four directions in turn according to a period; performing phase shifting and frequency mixing on a coupling signal of the echo signal and the transmitting signal, performing down-conversion to a base band, and performing band-pass filtering to obtain a side frequency component containing a Doppler frequency spectrum; carrying out IQ demodulation on the side frequency component and IQ two-path coherent reference signals thereof to obtain an IQ signal of a Doppler spectrum; and calculating the IQ signal of the Doppler frequency to obtain the speed information of the aerial carrier. The method greatly reduces the isolation index requirement of the receiving / transmitting antenna of the Doppler radar, improves the speed measurement capability of the Doppler radar during low-altitude low-speed flight, and can be used for airborne Doppler radars.

The invention provides an AD9361-based radio interference signal generation method, which is characterized in that a baseband interference signal is generated in an FPGA (Field Programmable Gate Array) through the function configuration of a multi-path parallel DDS (Direct Digital Synthesizer) and an upper computer, the baseband interference signal and a local oscillator signal are mixed through the configuration of AD9361, and then the interference signal is output in a radio frequency manner, and the AD9361-based radio interference signal generation method has four interference modes, the interference modes comprise a single-tone interference mode, a frequency sweeping interference mode, a frequency hopping interference mode and a suppression interference mode. According to the invention, target interference capability of multiple frequency bands and multiple communication systems can be realized, and the effect of changing flexibility into controllability is achieved; according to AD9361 configuration, effective power control can be utilized to the maximum extent, and the output management capability of the system is improved.

The invention discloses a method for upgrading and transforming an analog simulation system based on point-to-point communication, which comprises the following steps of: upgrading a communication protocol, forming communication middleware by establishing a DDS (Direct Digital Synthesizer) information warehouse and packaging a communication data interface in an original system, and establishing connection between operating console software and the DDS information warehouse through the communication middleware, completing data subscription and distribution; the method comprises the following steps: transforming data sending ends of software in an original system, only reserving a sending end generated by a data source and ignoring a forwarding data link among the software through data interface arrangement and transmission process tracing, then calling a corresponding data distribution interface function of communication middleware to replace an original sending end module, and uploading data to a communication bus; each software receiving end in an original system is transformed, each software subscribes to a data interface which needs to be received, then a corresponding data receiving interface function of communication middleware is called to replace an original TCP receiving end module, and needed data is obtained from a communication bus.

An antenna circuit for a drilling system beacon. The circuit includes a carrier direct digital synthesizer (“DDS”) and a communication DDS that generate respective signals used to drive an antenna and produce a beacon signal having both carrier and communication components. To obtain an accurate indication of carrier amplitude for feedback control, the beacon signal is synchronously mixed with the carrier DDS signal using an analog switch or similar mixer. The resulting mixed signal contains sum and difference components that are passed through a lowpass filter to remove contributions from the communication component. The filtered output provides a direct current (“DC”) value representative only of the carrier amplitude, enabling a processor to regulate drive parameters without contamination from communication signals.

A DDS circuit includes a phase accumulator circuit. The phase accumulator circuit includes a clock input being configured to receive a clock signal. The phase accumulator circuit includes a frequency tuning register configured to receive a frequency tuning word (FTW), and a phase shift register configured to receive a phase shift word (PSW). The phase accumulator circuit also includes a phase increment sub-circuit configured to increment a phase signal output by the phase accumulator circuit by a predetermined phase increment based on the clock signal and / or based on the FTW. The phase accumulator circuit further includes a feedback path configured to feed back the phase signal to the phase increment sub-circuit. The phase accumulator circuit further includes a phase correction sub-circuit configured to adapt the phase signal fed back to the phase increment sub-circuit based on the phase shift word.

Disclosed is a direct digital chirp synthesizer for generating a chirped optical frequency comb that includes: a direct digital synthesizer that receives a repetition frequency signal from a delay generator, receives a clock frequency from a frequency converter, produces a radiofrequency chirp waveform based on the repetition frequency signal and the clock frequency, and communicates the radiofrequency chirp waveform; and an electro optic modulator in electrical communication with the direct digital synthesizer and that receives the radiofrequency chirp waveform from the direct digital synthesizer, receives laser light, and produces the chirped optical frequency comb from the laser light based on the radiofrequency chirp waveform.

The present invention discloses a laser control system for a coherent population trapping magnetometer. The system comprises a core control unit, a drive circuit system, a microwave source signal modulation system, and an H-bridge bidirectionally connected to the core control unit. The drive circuit system includes a bandgap reference voltage circuit, which includes an input low-power bias startup circuit and a folding operational amplifier. The core control unit includes an FPGA and a temperature control circuit system, which uses an anti-integration windup algorithm combined with fuzzy PID control to dynamically adjust PID parameters to achieve temperature regulation. The microwave source signal modulation system includes a fully digital phase-locked loop, a direct digital synthesizer, and a frequency multiplier. The FPGA controls the generation, modulation, and amplification of microwave signals. The laser control system of the present invention has high microwave source frequency stability and strong noise suppression capabilities.

The invention provides a cloud edge collaborative data distribution method and system. Relates to a digital information transmission method and system. The method comprises the following steps: acquiring a service priority of to-be-distributed data; when the service priority is a high priority, routing the data to be distributed to a DDS (Direct Digital Synthesizer) transmission channel; adjusting the QoS strategy of the DDS transmission channel based on the current network state of the edge node; and distributing the data to be distributed through a DDS transmission channel according to the adjusted QoS strategy. When the service priority is a low priority, routing the data to be distributed to an MQTT transmission channel; and transmitting the to-be-distributed data to a cloud end in a zero analysis mode.

The invention, which relates to the technical field of the precision measuring instrument, discloses a low-temperature-drift digital phase-locked eddy current sensor circuit comprising an MCU, an excitation signal generation module, an AC bridge module, and a high-speed precision ADC sampling module. The excitation signal generation module generates a high-stability 50kHz sine wave excitation signal through high-precision DAC and DMA transmission by adopting a DDS (Direct Digital Synthesizer) mode; the AC bridge module suppresses common-mode interference caused by probe temperature excursion by using a reference coil; the high-speed precise ADC sampling module is used for synchronously digitizing bridge output and excitation signals; the temperature compensation module performs real-time software compensation on the residual temperature excursion through an integrated digital temperature sensor and a pre-calibrated polynomial model; a digital phase-locked demodulation algorithm is realized in the MCU, and a displacement related amplitude is accurately extracted through digital multiplication and low-pass filtering. The circuit fundamentally inhibits temperature drift from hardware and software levels, and realizes high-precision and high-stability eddy current displacement measurement.

The invention discloses a video SAR (Synthetic Aperture Radar) real-time imaging processing system, method and equipment based on mercuric chloride NPU (Network Processing Unit) cluster and FPGA (Field Programmable Gate Array) isomerism, and belongs to the field of radar imaging and signal processing, the system comprises a DDS (Direct Digital Synthesizer) signal generation module, a digital-to-analog conversion module, a signal acquisition module, a data processing module and a data storage module; according to the method, generation and acquisition of a linear frequency modulation signal, digital down-conversion processing and data communication between mercuric chloride NPU clusters are completed through an FPGA based on the system, realization of an RD algorithm and an MD algorithm which can be subjected to parallel calculation is implemented on the mercuric chloride NPU clusters, and through pipeline scheduling and task parallelization, the mercuric chloride NPU clusters are subjected to parallel calculation. The full-process processing from signal generation and acquisition, preprocessing to an imaging algorithm is realized by adopting a pipeline processing mode, and high-frame-rate video SAR real-time imaging processing is realized; the equipment is used for implementing the method. The invention has the advantages of short development period, small volume, low power consumption and low cost.

The invention provides a deep learning-based countering airspace signal processing method and device, and belongs to the technical field of airspace signal countering. The method comprises the following steps: acquiring an unmanned aerial vehicle control signal, carrying out online learning on the control signal by adopting a 32-bit fixed-point operation artificial neural network ANN, and analyzing to obtain an analysis result containing the frequency, the frequency point and the rate of the control signal; the artificial neural network ANN is realized through FPGA (Field Programmable Gate Array) modularization; based on the analysis result, generating a digital source signal with the same frequency as the unmanned aerial vehicle control signal; performing FSK modulation on the digital source signal by adopting a DDS (Direct Digital Synthesizer) algorithm; and carrying out power amplification and directional emission on the modulated signal to realize airspace signal countering. The complex signal analysis precision can be improved, the hardware resource consumption is reduced, and the real-time performance and the cost are both considered.

The invention relates to the technical field of nuclear magnetic resonance, in particular to a real-time self-checking system applied to low-field nuclear magnetic equipment, in the system, a control end of a field programmable gate array is respectively connected to a radio frequency power amplifier and each radio frequency switch; the direct digital synthesizer is connected to the probe through the first coupler, the radio frequency power amplifier and the second coupler in sequence, and the coupling end of the first coupler is connected to the first radio frequency switch; a first radio frequency end of the first radio frequency switch is connected to the first analog-to-digital converter, a second radio frequency end of the first radio frequency switch is connected with a second radio frequency end of the second radio frequency switch, a first radio frequency end of the second radio frequency switch is connected to the radio frequency power amplifier, and a common end of the second radio frequency switch is connected to the first analog-to-digital converter through the preamplifier; the second coupler is connected to the second analog-to-digital converter through the third radio frequency switch. The system is simple in structure, can monitor the low-field nuclear magnetic equipment in real time, and can accurately position a fault source.

The invention relates to a DDS data dynamic subscription method and device, a record playback system, electronic equipment and a storage medium, the method is used for dynamic subscription of DDS data of different types of sending end DDSs and receiving end DDSs, and the method comprises the following steps: obtaining IDL files corresponding to the sending end DDSs; automatically generating an executable Python subscription script according to the IDL file; the method comprises the steps of receiving a Python subscription script, executing the Python subscription script, creating a DataReader according to the Python subscription script, receiving a corresponding original message through the DataReader after the Python subscription script monitors that a sending end DDS releases data, analyzing the original message, and outputting the analyzed data. According to the data subscription method and device, a DDS subscription code does not need to be manually written and the SDKs of different manufacturers do not need to be adapted, the user can complete data subscription only by uploading the IDL, and the development efficiency is greatly improved.

In one example, an RF oscillator system includes a laser source configured to emit laser light, a housing, a crystalline microresonator disposed within the housing, and a photonic integrated circuit disposed within the housing, the photonic integrated circuit including an optical waveguide network and configured to generate a clock signal based on the laser light. The RF oscillator system may further include at least one photonic wirebond configured to couple the laser light between the optical waveguide network and the crystalline microresonator via evanescent coupling; laser control circuitry disposed within the housing and configured to lock a frequency of the laser light to a resonance of the microresonator to generate the clock signal; and a direct digital synthesizer disposed within the housing and configured to produce a tunable oscillator signal based on the clock signal.

The invention provides a low-phase-noise frequency agility frequency synthesizer based on a DDS (Direct Digital Synthesizer). The frequency synthesizer comprises a frequency mixer, the frequency mixer is connected with a C wave band dot frequency source and a P wave band frequency hopping source, and the output of the frequency mixer is output after being filtered and amplified. According to the invention, through the three-stage architecture of the crystal oscillator, the comb spectrum generator and the rapid frequency conversion, the requirements of the system on core indexes of phase noise, spurious suppression, agility speed and the like are met, and a high-reliability local oscillation source can be provided for a high-frequency system; the low phase noise can be effectively ensured by suppressing harmonic distortion based on the comb spectrum generator, the phase jitter problem in frequency synthesis can be significantly reduced based on the design of the P-band frequency hopping source, and by combining the high resolution of the frequency hopping source and the broadband coverage capability of the dot frequency source, the extremely wide range output can be realized, the multi-stage PLL cascade is not needed, and the circuit complexity is significantly reduced.

A sine wave generation circuit includes: a first direct digital synthesizer generating a digital sine wave fundamental signal having a frequency f0 in a normal operation mode and a calibration mode; a second direct digital synthesizer generating a digital second harmonic correction signal having a frequency 2f0 in the normal operation mode; a correction circuit superimposing the digital second harmonic correction signal on the digital sine wave fundamental signal; a D / A converter converting an output of the correction circuit into an analog sine wave signal; an output buffer receiving the analog sine wave signal and outputting an analog sine wave output signal; an A / D converter converting the analog sine wave output signal into a digital signal in the calibration mode; and a processing circuit generating a spectrum based on the digital signal in the calibration mode and setting a parameter of the second direct digital synthesizer based on the spectrum.

The invention discloses a microwave photon fast frequency hopping signal generation system and method. The system comprises a master laser, a light beam splitter, a slave laser, a semiconductor optical amplifier, an IQ modulator and a photoelectric detector. The main laser generates a single-frequency optical signal, and the single-frequency optical signal is modulated by the low-carrier-frequency radio-frequency signal gain switch to generate a wide-spectrum optical frequency comb; the method comprises the following steps of: dividing an optical signal into an upper branch and a lower branch through an optical beam splitter, injecting the optical signal into a slave laser through a polarization controller and a circulator to perform frequency-selecting filtering, then increasing the rejection ratio through a semiconductor optical amplifier, and loading the lower branch to a communication signal to control the phase difference between an I path and a Q path in a modulator, when carrier suppression single sideband modulation is realized, a + 1 order sideband and a-1 order sideband can be flexibly selected; and finally, beat frequency is carried out on the upper and lower branches through a photoelectric detector to realize communication signal output in a double-frequency coverage range. According to the invention, the difficulty of realizing a frequency hopping signal in a high carrier frequency and broadband range by a direct digital synthesizer in an electronic domain is greatly reduced.

The invention relates to a lightweight DDS (Direct Digital Synthesizer) message sending method, which comprises the following steps that: a DDS protocol stack module receives sample data sent by an application program, and calculates the maximum total length of a WriteHistories management node and an RTPS (Real-time Transport Packet Switching) message according to the sample data; the DDS protocol stack module applies for a serialized memory according to the maximum total length; the DDS protocol stack module serializes the sample data to the Payload of the DATA sub-message of the RTPS message; the RTPS message is inserted into a Cache node of a WriterHistories (WriterHistories); and sending the complete RTPS message through the network. According to the method, the data sending process is optimized, and the memory copying frequency and the memory application frequency are reduced, so that the processing time loss of a data sending interface is reduced, and the real-time performance and efficiency of data transmission are improved.

The application discloses a nanosecond pulse laser driving control device and method, relates to the technical field of nanosecond pulse lasers, and comprises a main control module connected with a digital-analog conversion module, a direct digital synthesizer module, a reference operation and current monitoring module, a signal output selection module and a signal coupling and current monitoring module respectively; the reference operation and current monitoring module is connected with the digital-analog conversion module; a pulse signal generation and conditioning module is connected with the direct digital synthesizer module and the signal output selection module respectively; the signal coupling and current monitoring module is connected with the signal output selection module; the reference operation and current monitoring module and the signal coupling and current monitoring module are connected with a target nanosecond pulse laser, and the application can improve the stability and reliability in the driving control process of the target nanosecond pulse laser.

The invention relates to a DDS (Direct Digital Synthesizer) data playback method and system, and the method comprises the steps: obtaining DDS original data, and recording an original transmission frequency; screening the DDS original data according to a specified field to obtain a visual data set; in the slow playing scene, calculating an acquisition interval according to the set playback magnification and the original sending frequency, and calculating a target receiving frequency in the slow playing scene based on the acquisition interval; under the quick playing scene, downsampling processing is performed on the visual data set, a downsampling interval is calculated according to the playback magnification and the original sending frequency, and a target receiving frequency under the quick playing scene is calculated by using an automatic matching method based on the downsampling interval; and performing visual rendering display on the final visual data set based on the target receiving frequency. According to the invention, the limitation of existing fixed sampling can be broken through, downsampling is carried out in a fast playback scene to ensure rendering fluency, the acquisition interval is adjusted in a slow playback scene to reserve data details, and adaptive optimization at different playback speeds is realized.

The present invention discloses a frequency source synthesis system and method based on a frequency-agile radar, belonging to the technical field of microwave radio frequency, and specifically including: generating a target clock signal and performing frequency processing on the target clock signal to generate a frequency-multiplied signal, and dividing the frequency-multiplied signal into two clock signals through a power divider; performing frequency multiplication processing on one of the clock signals and using the processed signal as a clock reference signal of a direct digital synthesizer, generating an analog signal according to the clock reference signal, and calibrating the analog signal as an output signal; performing frequency multiplication processing on the other clock signal and using the processed clock signal as a local oscillator signal of a mixer; performing frequency conversion processing to obtain a mixed-frequency signal, performing 4-fold frequency multiplication processing on the mixed-frequency signal, and calibrating the processed mixed-frequency signal as a final output signal; the present invention realizes that the frequency source simultaneously has the characteristics of low phase noise, fast frequency agility, fine resolution and miniaturization.

The present invention relates to the field of nuclear magnetic resonance technology, and in particular to a real-time self-test system applied to low-field nuclear magnetic resonance equipment, in which the control end of a field programmable gate array is respectively connected to a radio frequency power amplifier and each radio frequency switch; a direct digital synthesizer is sequentially connected to a probe through a first coupler, a radio frequency power amplifier and a second coupler, and the coupling end of the first coupler is connected to a first radio frequency switch; a first radio frequency end of the first radio frequency switch is connected to a first analog-to-digital converter, a second radio frequency end of the first radio frequency switch is connected to a second radio frequency end of the second radio frequency switch, a first radio frequency end of the second radio frequency switch is connected to the radio frequency power amplifier, and a common end of the second radio frequency switch is connected to the first analog-to-digital converter through a preamplifier; and a second coupler is connected to the second analog-to-digital converter through a third radio frequency switch. The system has a simple structure, can monitor low-field nuclear magnetic resonance equipment in real time, and can accurately locate the source of a fault.