Electromagnetic environment monitoring system

Abstract

The invention discloses an electromagnetic environment monitoring system, and relates to the technical field of electromagnetic environment monitoring circuits, and the system comprises an electric field electromagnetic environment monitoring module which is used for receiving electric field analog signals of two electric field sensors after receiving a remote control signal issued by a main control module, and transmitting the electric field analog signals to a main control module; processing the electric field analog signals to obtain electric field signal characteristic data of each electric field sensor, and performing abnormity judgment on the electric field signal characteristic data; the magnetic field electromagnetic environment monitoring module processes a magnetic field analog signal of a magnetic field sensor to obtain magnetic field characteristic signal data after receiving a remote control signal issued by the main control module, and performs abnormality judgment on the magnetic field characteristic signal data; and the main control module is used for reporting related abnormal data information to a background management host when the abnormal judgment result is abnormal, can remotely control the working state of the electromagnetic environment monitoring unit, and can respectively monitor the electric field environment and the magnetic field environment in the cabin in real time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic environment monitoring circuit, in particular to an electromagnetic environment monitoring system. BACKGROUND

[0002] The current monitoring equipment often has the problems of inaccurate data monitoring of electronic sensors or inability to obtain data in real time, so that the electronic monitoring system of the ship cannot monitor the data of each system in real time. In view of the above problems, there is an urgent need for an electromagnetic environment monitoring system capable of remote control and real-time monitoring. SUMMARY

[0003] The purpose of the present application is to provide an electromagnetic environment monitoring system which can receive remote control signals from a superior system, remotely control the working state of the electromagnetic environment monitoring unit, and monitor the electric field and magnetic field environment in the cabin in real time.

[0004] To achieve the above purpose, the present application provides the following solutions:

[0005] The present application provides an electromagnetic environment monitoring system, which comprises a main control module, a plurality of electric field electromagnetic environment monitoring modules, a plurality of magnetic field electromagnetic environment monitoring modules and a power module; the power module is used for supplying power to the main control module, the plurality of electric field electromagnetic environment monitoring modules and the plurality of magnetic field electromagnetic environment monitoring modules;

[0006] Each of the electric field electromagnetic environment monitoring modules is configured to: after receiving the remote control signal issued by the main control module, receive electric field analog signals of two electric field sensors, process each electric field analog signal to obtain electric field signal characteristic data of each electric field sensor, and perform abnormality determination on the electric field signal characteristic data of each electric field sensor to obtain an abnormality determination result of each electric field sensor;

[0007] The magnetic field electromagnetic environment monitoring module is configured to: after receiving the remote control signal issued by the main control module, receive magnetic field analog signals of the magnetic field sensors, process the magnetic field analog signals of the magnetic field sensors to obtain magnetic field characteristic signal data, and perform abnormality determination on the magnetic field characteristic signal data of each magnetic field sensor to obtain an abnormality determination result of each magnetic field sensor;

[0008] The main control module is configured to: when the abnormality determination result is abnormal, report relevant abnormal data information to a background management host.

[0009] Optionally, the electric field electromagnetic environment monitoring module comprises a first parallel processing unit and an electric field multi-channel signal processor; the first parallel processing unit comprises two first signal processing subunits processed in parallel; each first signal processing subunit comprises a first buffer amplifier, an electric field signal conditioning circuit and an electric field high-speed AD sampling circuit, and is configured to process electric field analog signals of two electric field sensors respectively to obtain digital signals of each electric field sensor;

[0010] The first buffer amplifier is configured to perform signal buffering and adaptation on the electric field analog signals to obtain buffered and adapted electric field analog signals.

[0011] The electric field signal conditioning circuit is configured to perform low-pass filtering, frequency compensation and compression transformation on the buffered and adapted electric field analog signals to obtain signal-conditioned electric field analog signals.

[0012] The electric field high-speed AD sampling circuit is configured to sample, quantize and encode the signal-conditioned electric field analog signals to obtain the digital signals of each electric field sensor.

[0013] The electric field multi-channel signal processor comprises a frequency domain analysis unit and a secondary processing unit; the frequency domain analysis unit is configured to convert the digital signals of each electric field sensor from time domain to frequency domain by using an FFT algorithm to obtain electric field signal feature data of each electric field sensor; the electric field signal feature data comprises amplitude and frequency spectrum.

[0014] The secondary processing unit is configured to process the electric field signal feature data of each electric field sensor to obtain an abnormality determination result of each electric field sensor.

[0015] Optionally, the electric field multi-channel signal processor is an FPGA signal processing circuit.

[0016] Optionally, the secondary processing unit is a first MCU processor.

[0017] Optionally, the magnetic field electromagnetic environment monitoring module comprises a second parallel processing unit and a magnetic field multi-channel signal processor; the magnetic field analog signals comprise magnetic field signals in three directions;

[0018] The second parallel processing unit comprises three second signal processing subunits processed in parallel; each second signal processing subunit comprises a second buffer amplifier and a magnetic field signal conditioning circuit, and is configured to process magnetic field signals in one direction of the magnetic field analog signals to obtain signal-conditioned magnetic field analog signals in the one direction;

[0019] The second buffer amplifier is configured to perform signal buffering and adaptation on the magnetic field signals in one direction of the magnetic field analog signals to obtain buffered and adapted magnetic field analog signals.

[0020] The magnetic field signal conditioning circuit is configured to perform low-pass filtering and amplification on the buffered and adapted magnetic field analog signal to obtain a signal-conditioned magnetic field analog signal.

[0021] The magnetic field multi-channel signal processor comprises an AD sampling unit and a signal analysis unit.

[0022] The signal analysis unit is configured to perform signal frequency domain analysis on the digital signal of the magnetic field sensor to obtain magnetic field characteristic signal data of the magnetic field sensor, and perform abnormality determination on the magnetic field characteristic signal data of each magnetic field sensor to obtain an abnormality determination result of each magnetic field sensor.

[0023] Optionally, the magnetic field multi-channel signal processor is a second MCU processor.

[0024] Optionally, the main control module is connected to the electric field electromagnetic environment monitoring module and the magnetic field electromagnetic environment monitoring module through a CAN bus.

[0025] Optionally, the main control module is further configured to perform alarm when communication with the electric field electromagnetic environment monitoring module and the magnetic field electromagnetic environment monitoring module is disconnected.

[0026] Optionally, the main control module comprises a built-in storage space configured to regularly save data and related abnormal data information collected by the electric field electromagnetic environment monitoring module and the magnetic field electromagnetic environment monitoring module.

[0027] Optionally, the number of the electric field electromagnetic environment monitoring modules is 2, and the number of the magnetic field electromagnetic environment monitoring modules is 4.

[0028] According to the specific embodiments provided in the application, the application discloses the following technical effects: the application provides an electromagnetic environment monitoring system, which comprises a main control module, a plurality of electric field electromagnetic environment monitoring modules, a plurality of magnetic field electromagnetic environment monitoring modules and a power module. The main control module sends remote control signals to the electric field electromagnetic environment monitoring modules and the magnetic field electromagnetic environment monitoring modules. After receiving the remote control signals sent by the main control module, the electric field electromagnetic environment monitoring modules receive electric field analog signals of two electric field sensors, process each electric field analog signal to obtain electric field signal characteristic data of each electric field sensor, and perform abnormality determination on the electric field signal characteristic data of each electric field sensor to obtain an abnormality determination result of each electric field sensor. After receiving the remote control signals sent by the main control module, the magnetic field electromagnetic environment monitoring modules receive magnetic field analog signals of magnetic field sensors, process the magnetic field analog signals of the magnetic field sensors to obtain magnetic field characteristic signal data, and perform abnormality determination on the magnetic field characteristic signal data of each magnetic field sensor to obtain an abnormality determination result of each magnetic field sensor. Based on the above, the application remotely controls the working state of the electromagnetic environment monitoring unit, and can monitor the electric field and magnetic field environments in the cabin in real time. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0030] Figure 1 A structural schematic diagram of an electromagnetic environment monitoring system provided by an embodiment of the application.

[0031] Figure 2 A functional block diagram of the whole machine provided by an embodiment of the application.

[0032] Figure 3 A principle block diagram of an electric field electromagnetic environment monitoring module provided by an embodiment of the application.

[0033] Figure 4 A principle block diagram of a magnetic field electromagnetic environment monitoring module provided by an embodiment of the application.

[0034] Figure 5 A principle block diagram of a magnetic field electromagnetic environment monitoring module provided by an embodiment of the application.

[0035] Figure 6 A logic schematic diagram of a main control module provided by an embodiment of the application.

[0036] Figure 7The internal structure logic diagram provided by an embodiment of the present application.

[0037] Figure 8 The electromagnetic environment monitoring principle diagram provided by an embodiment of the present application.

[0038] Figure 9 The electric field signal conditioning circuit principle diagram provided by an embodiment of the present application. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0040] Abbreviation explanation:

[0041] CAN-Controller Area Network, short for Controller Area Network.

[0042] MCU-Microcontroller Unit, short for Microcontroller Unit.

[0043] FPGA-Field Programmable Gate Array, short for Field Programmable Gate Array.

[0044] EMMC-Embedded Multimedia Card, short for Embedded Multimedia Card.

[0045] EMI-Electromagnetic Interference, short for Electromagnetic Interference.

[0046] ACDC-Alternating Current to Direct Current, short for Alternating Current to Direct Current.

[0047] The above-mentioned purposes, features and advantages of the present application can be more obvious and easy to understand. The present application will be described in further detail below with reference to the drawings and specific embodiments.

[0048] In an exemplary embodiment, as shown in Figure 1 An electromagnetic environment monitoring system is provided, including a master control module, a plurality of electric field electromagnetic environment monitoring modules, a plurality of magnetic field electromagnetic environment monitoring modules and a power module; the power module is used to supply power to the master control module, the plurality of electric field electromagnetic environment monitoring modules and the plurality of magnetic field electromagnetic environment monitoring modules.

[0049] As Figure 2 shown, the electric field electromagnetic environment monitoring module and the magnetic field electromagnetic environment monitoring module are respectively linked with the electric field sensor and the magnetic field sensor, and can respectively monitor the electric field and the magnetic field environment in the cabin. The electric field electromagnetic environment monitoring module and the magnetic field electromagnetic environment monitoring module are integrated together and installed in the same monitoring box.

[0050] The number of the electric field electromagnetic environment monitoring module is 2, and the number of the magnetic field electromagnetic environment monitoring module is 4. The electromagnetic environment monitoring system adopts a modular design scheme, and is divided into modules according to main functions. It is proposed to be composed of one EMI filter, one ACDC power module, one main control module, four magnetic field electromagnetic environment monitoring modules, two electric field electromagnetic environment monitoring modules, one protocol conversion module and one switch module.

[0051] Through the electromagnetic environment monitoring system, four electric field signals and four channel magnetic field signals are collected. The main control module in the unit receives the collected signals of each module through the CAN bus interface, realizes signal data analysis and processing, data storage and recording, abnormal event reminding and alarming and other functions, and receives the commands transmitted by the background management host through the Ethernet interface, realizes parameter setting, data uploading and other functions.

[0052] The index of the electric field electromagnetic environment monitoring module is as follows: four channels of electric field monitoring, signal frequency 10 kHz-30 MHz; electric field interference frequency domain amplitude error: ≤±4 dB; +12V±1% power output, which powers the electric field sensor. The signal source of the battery analog signal: electric field sensor output; monitoring each frequency point satisfies: |amplitude characteristic linearity-10 dB|≤6 dB, and the electric field signal dynamic range acceptance method refers to the electric field sensor. The electric field frequency signal source: signal generator, signal amplitude 1 Vrms, sine wave, measurement frequency point is an integer multiple of resolution; monitoring each frequency point, frequency resolution satisfies, 10 kHz-150 kHz≤1 kHz; 150 kHz-30 MHz≤10 kHz; the electric field interference frequency domain amplitude error satisfies: ≤±4 dB.

[0053] The magnetic field electromagnetic environment monitoring module indexes are as follows: magnetic field monitoring channel 12 (4 channels * 3, 3 channels for each channel), signal frequency 25Hz-120kHz; magnetic field interference frequency domain amplitude error: ≤±4dB; +12V±1% power output, power supply for magnetic field sensor. The signal source of the magnetic field analog signal: magnetic field sensor output, monitoring each frequency point to meet: |amplitude characteristic linearity-10dB|≤6dB, magnetic field signal dynamic range acceptance method refers to the magnetic field sensor. The signal source of the magnetic field frequency signal: signal generator, signal amplitude 1Vrms, sine wave, measurement frequency point is an integer multiple of the resolution; monitor each frequency point, the frequency resolution meets: 25Hz~1kHz≤10Hz, 1kHz~10kHz≤100Hz, 10kHz~120kHz≤1000Hz, the magnetic field interference frequency domain amplitude error meets: ≤±4dB.

[0054] As shown in Figure 7 and Figure 8 , an EMI filter is used to reduce undesirable noise in the 220V AC input signal, ensuring the integrity of the power supply. Figure 8 The black dotted boundary in the figure represents the electromagnetic environment monitoring system encapsulated in the monitoring box (also known as the chassis). Inside the electromagnetic environment monitoring system, there are facilities for processing signals from four magnetic field sensors (including 12 channels) and four electric field sensors (including 4 channels). In addition, the electromagnetic environment monitoring system also integrates two gigabit interfaces for data communication and two LED indicators for monitoring the running state, providing strong platform support for multi-channel sensor signal processing and data exchange. The switch module is responsible for relaying communication between upstream and downstream devices of the chassis, and also for realizing data interaction between the master module and the upper computer. The magnetic field sensor can be an MS-II sensor, and the electric field sensor can be an ES-II sensor.

[0055] (1) Each electric field electromagnetic environment monitoring module is configured to: after receiving a remote control signal issued by the master module, receive electric field analog signals of two electric field sensors, process each electric field analog signal to obtain electric field signal characteristic data of each electric field sensor, and determine whether each electric field sensor is abnormal based on the electric field signal characteristic data of each electric field sensor to obtain an abnormal determination result of each electric field sensor.

[0056] The principle of the electric field electromagnetic environment monitoring module is as shown in Figure 3As shown. Each electric field electromagnetic environment monitoring module supports synchronous parallel acquisition and processing of two signals. The electric field electromagnetic environment monitoring module includes a first parallel processing unit and an electric field multi-channel signal processor. The first parallel processing unit includes two first signal processing sub-units for parallel processing. Each first signal processing sub-unit includes a first buffer amplifier, an electric field signal conditioning circuit, and an electric field high-speed AD sampling circuit, which are used to process the electric field analog signals of the two electric field sensors respectively to obtain the digital signal of each electric field sensor.

[0057] The first buffer amplifier is used to buffer and adapt the electric field analog signal to obtain a buffered and adapted electric field analog signal. The electric field signal conditioning circuit is used to perform low-pass filtering, frequency compensation, and compression transformation on the buffered and adapted electric field analog signal to obtain a conditioned electric field analog signal. The electric field signal conditioning circuit performs filtering and amplification of the sensor input signal. After passing through voltage divider circuits and broadband operational amplifier circuits, the buffered and adapted electric field analog signal is adjusted to the range that the high-speed AD sampling circuit can process.

[0058] like Figure 9 As shown, the electric field signal conditioning circuit includes two rail-to-rail high-speed high-impedance operational amplifiers SGM8051 and resistor-capacitor components, specifically including high-speed high-impedance operational amplifier U1, first resistor R1, second resistor R2, third resistor R3, fourth resistor R4, fifth resistor R5, sixth resistor R6, first capacitor C1 and second capacitor C2. The negative input terminal I- of the high-speed, high-impedance operational amplifier U1 is connected to one end of the first resistor R1 and one end of the third resistor R3. The other end of the first resistor R1 is connected to the first buffer amplifier. The other end of the third resistor R3 is connected to the positive output terminal O+ of the high-speed, high-impedance operational amplifier U1 and one end of the fifth resistor R5. The other end of the fifth resistor R5 is connected to one end of the second capacitor C2 and the high-speed AD sampling circuit for the electric field. The other end of the second capacitor C2 is grounded. The power input terminal VC of the high-speed, high-impedance operational amplifier U1 is connected to the common voltage VCOM1. The positive input terminal I+ of the high-speed, high-impedance operational amplifier U1 is connected to one end of the second resistor R2 and the fourth resistor R4. The other end of the second resistor R2 is grounded. The other end of the fourth resistor R4 is connected to the negative output terminal O- of the high-speed, high-impedance operational amplifier U1 and one end of the sixth resistor R6. The other end of the sixth resistor R6 is connected to one end of the first capacitor C1 and the high-speed AD sampling circuit for the electric field. The other end of the first capacitor C1 is grounded. The positive power input terminal V+ of the high-speed, high-impedance operational amplifier U1 and... The pins are connected and connected to a +5V power supply. The negative power supply terminal V- of the high-speed, high-impedance operational amplifier U1 is grounded.

[0059] The pin is a control pin that is active low. (Logic '1', usually connected to the positive power supply V+ or logic high level): high-speed high-impedance operational amplifier U1 is in normal working mode, works like a normal operational amplifier, consumes normal static current, and can amplify input signals. When (Logic '0', usually connected to ground GND or logic low level): the operational amplifier is turned off or enters low-power standby mode. In this embodiment, The pin is connected to the +5V voltage power supply, representing that the high-speed high-impedance operational amplifier U1 is in normal working mode.

[0060] The electric field high-speed AD sampling circuit is used for sampling, quantizing and encoding the electric field analog signal after signal conditioning to obtain the digital signal of each electric field sensor.

[0061] The first buffer amplifier can use RS8751 high-speed operational amplifier, which has a unit gain bandwidth of up to 250MHz, an input bias current of less than 10pA, a working voltage of 5V, and a working temperature range of -40℃ to +125℃, and the performance indicators meet the requirements. The electric field high-speed AD sampling circuit can use SAD9467EE-250 chip.

[0062] The electric field multi-channel signal processor includes a frequency domain analysis unit and a secondary processing unit; the frequency domain analysis unit is used for converting the time domain frequency domain of the digital signal of each electric field sensor to obtain the electric field signal characteristic data of each electric field sensor by using the FFT algorithm; the electric field signal characteristic data includes amplitude and frequency spectrum. The secondary processing unit is used for processing the electric field signal characteristic data of each electric field sensor to obtain the abnormality determination result of each electric field sensor.

[0063] The electric field multi-channel signal processor is an FPGA signal processing circuit. The secondary processing unit is a first MCU processor.

[0064] The electric field electromagnetic environment monitoring module needs to process electric field analog signals with a bandwidth of 25kHz-30MHz, which is completed by using a high-speed AD sampling circuit, and digital signal processing is mainly completed by an FPGA signal processing circuit.

[0065] The electric field high-speed AD sampling circuit needs a higher sampling clock, and the FPGA signal processing circuit also needs a higher clock. For high-speed clock, the "circuit aperture jitter" caused by the instability of the clock edge itself within a certain range will bring uncertainty to the sampling point. The higher the frequency of the sampled signal, the greater the error. Therefore, a special high-speed clock circuit is used to provide a high-precision stable clock source for the system. The high-speed clock circuit includes a clock generator and a timing distribution unit, and the sampling clock generated by the clock generator is distributed to the electric field high-speed AD sampling circuit and the FPGA signal processing circuit through the timing distribution unit.

[0066] The electric field electromagnetic environment monitoring module sends the electric field analog signal output by the electric field sensor into the electric field signal conditioning circuit through the first buffer amplifier. The electric field signal conditioning circuit performs low-pass filtering, frequency compensation and compression transformation on the buffered and adapted electric field analog signal input, so that it meets the input signal requirements of the electric field high-speed AD sampling circuit. After signal conditioning, the electric field analog signal is converted and sent into the electric field high-speed AD sampling circuit through a high-speed differential driving chip. After sampling, quantization and coding, the electric field high-speed AD sampling circuit converts the digital signal into a digital signal and sends it to the FPGA signal processing circuit for storage, operation analysis and processing. The FPGA signal processing circuit realizes real-time operation on the collected signal, extracts signal characteristics, and outputs operation results. Specifically, the FPGA signal processing circuit uses the FFT algorithm to convert the time domain and frequency domain to obtain the amplitude and frequency spectrum of the electric field collection signal, and then hands it over to the first MCU processor for secondary processing of data. The first MCU processor is used to normalize the electric field signal characteristic data of each electric field sensor to obtain normalized electric field signal characteristic data, and compare the normalized electric field signal characteristic data with the corresponding electric field set threshold range. When the normalized electric field signal characteristic data is not in the electric field set threshold range, the abnormal judgment result is reported to the main control module, and the main control module reports the abnormal judgment result to the background management host. The background management host displays the abnormal judgment result and other operation processing. The abnormal judgment result includes abnormal type and abnormal data, and the abnormal type includes short circuit and overload.

[0067] The first MCU processor is also used to calculate the ratio of the output signal and the input signal to obtain the coefficient gain, which is used to reflect the amplification capability of the circuit or system. The output signal refers to the digital signal of the electric field sensor output by the electric field high-speed AD sampling circuit, and the input signal refers to the electric field analog signal input into the first buffer amplifier. The first MCU processor is also used to output the frequency point value when the normalized electric field signal characteristic data is not in the electric field set threshold range, i.e. the abnormal judgment result is abnormal. The frequency point value is a frequency value in the frequency band.

[0068] In one specific example, the high-speed differential driving chip can adopt a HA1001E type high-speed differential amplifier to convert the input single-ended analog signal into a differential signal with an adjustable common-mode voltage to adapt to the analog interface of the electric field high-speed AD sampling circuit, which also requires high gain bandwidth and good bandwidth gain flatness. The first MCU processor adopts a 200MHz frequency embedded ARMCortexM4 kernel processor or an HC32F4A0 processor, and the 00MHz frequency embedded ARMCortexM4 kernel processor is built-in with 512KB RAM and 2MB FLASHROM. The first MCU processor is responsible for the operation management and data communication management of the electric field high-speed AD sampling circuit. On the one hand, it receives the working parameters issued by the master control module through the CAN bus, and configures the working parameters of the electric field high-speed AD sampling circuit; on the other hand, it performs secondary processing on the data processed by the FPGA signal processing circuit, and uploads the abnormal judgment result to the master control module through the CAN bus.

[0069] The functions of the electric field electromagnetic environment monitoring module are as follows: receiving remote control signals from the upper system, remotely controlling the working state of the unit module, realizing short circuit, overload protection, and fault alarm; having high-speed acquisition and processing capability of 4-channel electric field data; having short circuit and overload protection functions; having a fault alarm function.

[0070] The magnetic field electromagnetic environment monitoring module receives the magnetic field analog signal of the magnetic field sensor after receiving the remote control signal issued by the master control module, processes the magnetic field analog signal of the magnetic field sensor to obtain the magnetic field characteristic signal data, and performs abnormal judgment on the magnetic field characteristic signal data of each magnetic field sensor to obtain the abnormal judgment result of each magnetic field sensor.

[0071] As shown in Figure 4 and Figure 5 . The magnetic field electromagnetic environment monitoring module includes a second parallel processing unit and a magnetic field multi-channel signal processor; the magnetic field analog signal includes magnetic field signals in three directions.

[0072] The second parallel processing unit includes three second signal processing subunits processed in parallel. Each second signal processing subunit includes a second buffer amplifier and a magnetic field signal conditioning circuit, which is used to process the magnetic field signal in one direction of the magnetic field analog signal to obtain a signal-conditioned magnetic field analog signal in one direction.

[0073] The second buffer amplifier is used to perform signal buffering and adaptation on the magnetic field signal in one direction of the magnetic field analog signal to obtain a buffered and adapted magnetic field analog signal. The magnetic field signal conditioning circuit is used to perform low-pass filtering and amplification arrangement on the buffered and adapted magnetic field analog signal to obtain a signal-conditioned magnetic field analog signal.

[0074] The magnetic field multi-channel signal processor comprises an AD sampling unit and a signal analysis unit; the AD sampling unit is configured to sample and quantize the magnetic field analog signal after signal conditioning, to obtain a digital signal of the magnetic field sensor. The magnetic field multi-channel signal processor is configured to process a second MCU processor.

[0075] The signal analysis unit is configured to perform signal frequency domain analysis on the digital signal of the magnetic field sensor, to obtain a magnetic field characteristic signal data of the magnetic field sensor, and to perform abnormality determination on the magnetic field characteristic signal data of each magnetic field sensor, to obtain an abnormality determination result of each magnetic field sensor. The signal analysis unit compares the magnetic field characteristic signal data of the magnetic field sensor with a set threshold range of the magnetic field corresponding to the magnetic field characteristic signal data. When the magnetic field characteristic signal data of the magnetic field sensor is not within the set threshold range of the magnetic field, it is determined that the abnormality determination result is abnormal. The abnormality determination result is reported to a main control module, which reports the abnormality determination result to a background management host. The background management host displays the abnormality determination result and performs other operation processing.

[0076] The signal bandwidth to be processed by the magnetic field electromagnetic environment monitoring module is relatively low. A low-speed AD sampling circuit is used, and the digital signal processing is completed by the second MCU processor with DSP function, to calculate corresponding voltage and current numerical results and FFT frequency domain analysis results. That is, the magnetic field characteristic signal data comprises the voltage and current numerical results and the FFT frequency domain analysis results.

[0077] The magnetic field electromagnetic environment monitoring module senses a weak magnetic field analog signal in space through the magnetic field sensor, which is sent to a magnetic field signal conditioning circuit through a second buffer amplifier. The magnetic field signal conditioning circuit performs low-pass filtering and amplification on the input magnetic field analog signal, to obtain the digital signal of the magnetic field sensor, so that the amplitude and frequency range thereof are adapted to the input signal requirements of the AD sampling unit.

[0078] In one specific example, the second buffer amplifier can be a high-performance, low-noise, zero-drift TPA1286 instrument amplifier with a bandwidth of 1.6 MHz and a common-mode rejection ratio greater than 80 dB. The AD sampling unit can be an HC32F4A0 embedded processor based on Cortex M4 core. The second MCU processor is a 200 MHz main frequency embedded ARM Cortex M4 core processor or an HC32F4A0 processor based on Cortex M4 core. The 200 MHz main frequency embedded ARM Cortex M4 core processor has 512 KB RAM and 2 MB FLASH ROM, and is internally provided with a 1 MSPS 12-bit AD converter. The AD converter built-in the second MCU processor serves as the AD sampling unit, directly sampling and quantizing the magnetic field analog signal after signal conditioning, and performing signal frequency domain analysis, sensor characteristic compensation and operation processing by the second MCU processor.

[0079] The second MCU processor is responsible for AD sampling and data operation, running management and data communication management. On the one hand, it receives the working parameters issued by the master control module through the CAN bus, configures the working parameters of the low-speed AD sampling unit, on the other hand, it further processes the digital signals of the magnetic field sensor of the AD sampling unit, detects the over-limit situation, and uploads the abnormal judgment result to the master control module through the CAN bus.

[0080] The functions of the magnetic field electromagnetic environment monitoring module are as follows: receiving remote control signals of the upper system, remotely controlling the working state of the unit module; having high-speed acquisition and processing capacity of 12-way magnetic field data (4 channels * 3 (3 ways per channel)); having short-circuit and overload protection functions; having fault alarm function.

[0081] (Three) the master control module, for reporting relevant abnormal data information to the background management host when the abnormal judgment result is abnormal. The logic of the master control module is as shown in Figure 6 The master control module includes a third MCU processor, a large-capacity flash memory, an Ethernet interface and a CAN bus interface. The master control module is connected with the electric field electromagnetic environment monitoring module and the magnetic field electromagnetic environment monitoring module through the CAN bus. The electromagnetic environment monitoring system communicates with the background management host using the Ethernet interface.

[0082] The third MCU processor is used to manage the received acquisition data of the electric field electromagnetic environment monitoring module and the magnetic field electromagnetic environment monitoring module through the CAN bus, and process the data. The parameter settings and acquisition commands issued by the background management host are received through the Ethernet interface, and then forwarded to the corresponding electric field electromagnetic environment monitoring module and magnetic field electromagnetic environment monitoring module. The data collected by each electric field electromagnetic environment monitoring module and magnetic field electromagnetic environment monitoring module is transmitted to the background management host through the Ethernet interface to report the over-limit electromagnetic environment data.

[0083] The master control module manages the received acquisition data of the electric field electromagnetic environment monitoring module and the magnetic field electromagnetic environment monitoring module through the CAN bus, reports the data in stages, judges abnormal events, and stores and forwards the data to the background management host (upper computer) according to the corresponding requirements; the master control module also receives and processes the commands of the upper computer, including control unit running state setting, data uploading to specified IP, parameter setting, data reading and other functions. The master control module has a built-in 32 GB storage space, which is used to save the collected electromagnetic environment data and related abnormal data information of over-limit regularly.

[0084] The master module is further configured to alarm when communication with the electric field electromagnetic environment monitoring module and the magnetic field electromagnetic environment monitoring module is disconnected. When the device has network connection abnormalities, channel abnormalities, and the like, the corresponding heartbeat packet stops, and fault code uploading will cause the background management host to provide a fault prompt. The master module has a built-in storage space for regularly saving data collected by the electric field electromagnetic environment monitoring module and the magnetic field electromagnetic environment monitoring module and related abnormal data information. The storage function is divided into regular data storage and abnormal data storage. The regular data storage stores 4 electric field signals and 4 magnetic field signals, and the storage interval is 1 hour (the interval time can be determined according to the size of the storage capacity). The abnormal data storage stores alarm data such as communication and sensor offline.

[0085] The master module receives parameter settings and collection commands issued by the background management host through the Ethernet interface, and then forwards them to the corresponding electric field electromagnetic environment monitoring module and magnetic field electromagnetic environment monitoring module. When the master module receives a data reporting command from the background management host through the Ethernet interface, the third MCU processor transmits the data collected by each electric field electromagnetic environment monitoring module and magnetic field electromagnetic environment monitoring module to the background management host through the Ethernet interface, actively reports the over-limit electromagnetic environment data (abnormal determination result), and the background management host displays the result and performs other operation processing.

[0086] In a specific example, the third MCU processor in the master module adopts a 200MHz main frequency embedded ARMCortexM4 kernel processor or an HC32F4A0 processor. The 200MHz main frequency embedded ARMCortexM4 kernel processor has a built-in 512KBRAM and a 2MBFLASHROM. The large-capacity flash memory adopts a 32GB large-capacity EMMC embedded NandFlash memory, and the Ethernet adopts a 1000M adaptive fast Ethernet interface.

[0087] The electromagnetic environment monitoring system has an outer dimension of no more than 290*320*180, respectively, length*height*depth, unit: mm, and a weight of ≤15 kg. The working temperature is -10℃ to +50℃, and the storage temperature is -40℃ to +70℃.

[0088] The power module has an input power of AC220V±5%, an input frequency of 50Hz±1%, a power consumption of no more than 200W (single), an insulation resistance of ≤20MΩ in cold state and ≤10MΩ in hot state, and a dielectric withstand voltage of 1200VAC between the AC input end and the chassis ground without breakdown or arc phenomenon within 60s.

[0089] The electromagnetic environment monitoring system provided in the application has the following functions:

[0090] 1) Receive remote control signal of superior system, can remote control electric field electromagnetic environment monitoring module's quantity and magnetic field electromagnetic environment monitoring module's working state;

[0091] 2) Have the processing capacity of simultaneously processing 4 channel electric field signal's high speed acquisition (single channel sampling rate 65M sps) and 4 channel magnetic field signal's high speed acquisition (single channel sampling rate 750Ksps), and upload the data after processing to the designated IP according to the requirement;

[0092] 3) Have 1 way independent network exchange module, not be controlled and be influenced by electromagnetic environment monitoring system, electromagnetic environment monitoring system power-on self-starting;

[0093] 4) Have fault alarm and indication function;

[0094] 5) Have the state detection function to the connected external sensor.

[0095] 6) Use generalization, standardization, modularization design technology to design, each component is independently debugged, tested, convenient to disassemble, reduce the production process difficulty, and the complexity of production debugging and maintenance.

[0096] The technical features of the above embodiments can be combined arbitrarily, to make the description simple, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered that it is within the scope of the present application.

[0097] The principles and implementation modes of the present application are described by applying specific examples in this paper, the above embodiment is only used to help understand the method and its core idea of the present application;At the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed. In conclusion, the content of the present application should not be understood as the limitation of the present application.

Claims

1. An electromagnetic environment monitoring system, characterized by The electromagnetic environment monitoring system comprises a master control module, a plurality of electric field electromagnetic environment monitoring modules, a plurality of magnetic field electromagnetic environment monitoring modules and a power module; the power module is used for supplying power for the master control module, the plurality of electric field electromagnetic environment monitoring modules and the plurality of magnetic field electromagnetic environment monitoring modules; Each electric field electromagnetic environment monitoring module is used for receiving electric field analog signals of two electric field sensors after receiving a remote control signal issued by the master control module, processing each electric field analog signal to obtain electric field signal characteristic data of each electric field sensor, performing abnormality determination on the electric field signal characteristic data of each electric field sensor to obtain an abnormality determination result of each electric field sensor; The magnetic field electromagnetic environment monitoring module is used for receiving magnetic field analog signals of a magnetic field sensor after receiving a remote control signal issued by the master control module, processing the magnetic field analog signals of the magnetic field sensor to obtain magnetic field characteristic signal data, and performing abnormality determination on the magnetic field characteristic signal data of each magnetic field sensor to obtain an abnormality determination result of each magnetic field sensor; The master control module is used for reporting relevant abnormal data information to a background management host when the abnormality determination result is abnormal.

2. The electromagnetic environment monitoring system of claim 1, wherein, The electric field electromagnetic environment monitoring module comprises a first parallel processing unit and an electric field multi-channel signal processor; the first parallel processing unit comprises two first signal processing subunits processed in parallel; each first signal processing subunit comprises a first buffer amplifier, an electric field signal conditioning circuit and an electric field high-speed AD sampling circuit, and is used for processing electric field analog signals of two electric field sensors to obtain digital signals of each electric field sensor; The first buffer amplifier is used for performing signal buffering and adaptation on the electric field analog signals to obtain buffered and adapted electric field analog signals; The electric field signal conditioning circuit is used for performing low-pass filtering, frequency compensation and compression transformation on the buffered and adapted electric field analog signals to obtain signal-conditioned electric field analog signals; The electric field high-speed AD sampling circuit is used for sampling, quantizing and encoding the signal-conditioned electric field analog signals to obtain digital signals of each electric field sensor; The electric field multi-channel signal processor comprises a frequency domain analysis unit and a secondary processing unit; The frequency domain analysis unit is used for converting the digital signals of each electric field sensor from a time domain to a frequency domain by using an FFT algorithm to obtain electric field signal characteristic data of each electric field sensor; The electric field signal characteristic data comprises an amplitude and a frequency spectrum; The secondary processing unit is used for processing the electric field signal characteristic data of each electric field sensor to obtain an abnormality determination result of each electric field sensor. The electric field multi-channel signal processor is an FPGA signal processing circuit.

3. The electromagnetic environment monitoring system of claim 2, wherein, The secondary processing unit is a first MCU processor.

4. The electromagnetic environment monitoring system of claim 2, wherein, The magnetic field electromagnetic environment monitoring module comprises a second parallel processing unit and a magnetic field multi-channel signal processor; the magnetic field analog signals comprise magnetic field signals in three directions; 5. The electromagnetic environmental monitoring system of claim 1, wherein, ​ The second parallel processing unit includes three second signal processing subunits for parallel processing, each second signal processing subunit including a second buffer amplifier and a magnetic field signal conditioning circuit, and being configured to process a magnetic field signal of one direction of the magnetic field analog signals to obtain a signal-conditioned magnetic field analog signal of the one direction; The second buffer amplifier is configured to perform signal buffering and adaptation on the magnetic field signal of one direction of the magnetic field analog signals to obtain a buffered and adapted magnetic field analog signal; The magnetic field signal conditioning circuit is configured to perform low-pass filtering and amplification on the buffered and adapted magnetic field analog signal to obtain the signal-conditioned magnetic field analog signal; The magnetic field multi-channel signal processor includes an AD sampling unit and a signal analysis unit; the AD sampling unit is configured to sample and quantize the signal-conditioned magnetic field analog signal to obtain a digital signal of the magnetic field sensor; The signal analysis unit is configured to perform signal frequency domain analysis on the digital signal of the magnetic field sensor to obtain a magnetic field characteristic signal data of the magnetic field sensor, and perform abnormality determination on the magnetic field characteristic signal data of each magnetic field sensor to obtain an abnormality determination result of each magnetic field sensor.

6. The electromagnetic environment monitoring system of claim 5, wherein, The magnetic field multi-channel signal processor is a second MCU processor.

7. The electromagnetic environmental monitoring system of claim 1, wherein, The main control module is connected with the electric field electromagnetic environment monitoring module and the magnetic field electromagnetic environment monitoring module through a CAN bus.

8. The electromagnetic environmental monitoring system of claim 1, wherein, The main control module is further configured to perform alarm when communication with the electric field electromagnetic environment monitoring module and the magnetic field electromagnetic environment monitoring module is disconnected.

9. The electromagnetic environmental monitoring system of claim 1, wherein, The main control module has a built-in storage space, which is configured to regularly save data and related abnormal data information collected by the electric field electromagnetic environment monitoring module and the magnetic field electromagnetic environment monitoring module.

10. The electromagnetic environmental monitoring system of claim 1, wherein, The number of the electric field electromagnetic environment monitoring modules is 2, and the number of the magnetic field electromagnetic environment monitoring modules is 4.

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