Electromagnetic interference detection device

Abstract

According to the electromagnetic interference detection device provided by the invention, the sub-antenna units in the directional antenna module are used for acquiring electromagnetic signals around the device, the radio frequency combiner is used for acquiring the electromagnetic signals of each sub-antenna unit, and then the radio frequency analog signals corresponding to the electromagnetic signals of each sub-antenna unit are sent to the frequency spectrum monitoring module; the frequency spectrum monitoring module analyzes each received radio frequency analog signal to obtain frequency spectrum data of each sub-antenna unit, and then feeds back the frequency spectrum data of each sub-antenna unit to the upper computer; and the upper computer processes each frequency spectrum data and outputs an electromagnetic interference detection result. By applying the device provided by the invention, electromagnetic signals can be directly acquired, a worker does not need to establish acquisition equipment and monitoring equipment, whether electromagnetic interference occurs can be quickly detected, the situation that the opportunity of electromagnetic interference is missed due to establishment of the acquisition equipment is avoided, the accuracy of a detection result is improved, and the timeliness of the detection result is ensured; and the workload of workers is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic testing, and in particular to an electromagnetic interference detection device. Background Art

[0002] Electromagnetic interference in the wireless communication band can have a significant impact on the quality of communication. If the interfered communication function involves safety (such as the Internet of Vehicles), the electromagnetic interference at this time may cause a safety accident, which is a very serious potential risk. Therefore, it is of great significance to monitor and locate the source of such electromagnetic interference.

[0003] At present, the method of determining the source of electromagnetic interference is usually that communication engineers manually collect the spectrum of the on-site environment, confirm the characteristics of the background spectrum, and then use the direction of the handheld directional antenna to determine the direction of the interference source. Electromagnetic interference is characterized by sporadic and time-sensitive. The current method of manually collecting on-site spectrum has a lag, and there is a situation where the time when the electromagnetic interference occurs is missed due to the collection action, resulting in inaccurate results of electromagnetic interference determination. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides an electromagnetic interference detection device, which can quickly collect electromagnetic signals for interference identification without setting up collection equipment during the process of electromagnetic interference identification, avoid missing the opportunity for electromagnetic interference to occur, and improve the accuracy of interference identification results.

[0005] An electromagnetic interference detection device, comprising:

[0006] Directional antenna module, RF combiner, spectrum monitoring module and host computer;

[0007] The directional antenna module is provided with a plurality of sub-antenna units, and different sub-antenna units are used to collect electromagnetic signals in different directions;

[0008] The RF combiner is used to obtain the electromagnetic signal collected by each of the sub-antenna units, and send a RF analog signal corresponding to the obtained electromagnetic signal to the spectrum monitoring module;

[0009] The spectrum monitoring module is used to analyze the received radio frequency analog signal, obtain the spectrum data of the sub-antenna unit corresponding to the radio frequency analog signal, and feed back the spectrum data to the host computer;

[0010] The host computer is used to process each spectrum data after receiving the spectrum data of each sub-antenna unit, and output the electromagnetic interference detection result.

[0011] The above device may optionally further include:

[0012] A radio frequency low noise amplifier is connected in series between the directional antenna module and the radio frequency combiner;

[0013] The radio frequency low noise amplifier is used to increase the signal-to-noise ratio.

[0014] In the above device, optionally, the process in which the radio frequency combiner is used to obtain the electromagnetic signal collected by each of the sub-antenna units includes:

[0015] The RF combiner is used to receive the state control instruction of the host computer, and switch the working mode based on the state control instruction, and obtain the electromagnetic signal of the sub-antenna unit corresponding to the working mode in the directional antenna module; the state control instruction corresponds to the sub-antenna unit one by one.

[0016] In the above-mentioned device, optionally, the process in which the RF combiner switches the working mode based on the state control instruction and obtains the electromagnetic signal of the sub-antenna unit corresponding to the working mode in the directional antenna module includes:

[0017] The radio frequency combiner comprises a plurality of input ports and an output port, wherein the input ports correspond one to one with the sub-antenna units;

[0018] The RF combiner determines a target input port among the input ports based on the state control instruction, and switches to an operating mode corresponding to the target input port, so that a built-in load in the RF combiner absorbs electromagnetic signals of sub-antenna units corresponding to other input ports, and the target input port and the output port are turned on to obtain electromagnetic signals of the sub-antenna unit corresponding to the target input port.

[0019] In the above device, optionally, the spectrum monitoring module performs a process of analyzing the received radio frequency analog signal to obtain spectrum data of the sub-antenna unit corresponding to the radio frequency analog signal, including:

[0020] The spectrum monitoring module is used to receive a frequency sweep instruction corresponding to the state control instruction sent by the host computer, and analyze the received RF analog signal based on the frequency sweep instruction to obtain spectrum data of the sub-antenna unit corresponding to the frequency sweep instruction, and the frequency sweep instruction corresponds to the state control instruction one by one.

[0021] In the above device, optionally, the host computer processes each of the spectrum data and outputs the electromagnetic interference detection result, including:

[0022] The host computer performs averaging processing on each of the spectrum data to obtain average spectrum data, performs interference amplitude identification based on the average spectrum data, and generates an electromagnetic interference detection result based on the identification result.

[0023] In the above device, optionally, the host computer performs a process of identifying the interference amplitude based on the average spectrum data and generating an electromagnetic interference detection result based on the identification result, including:

[0024] For the spectrum average value of each frequency point in the average spectrum data, determine whether the spectrum average value of the frequency point is less than a preset spectrum threshold value, if the spectrum average value of the frequency point is less than the preset spectrum threshold value, determine that the frequency point is not an abnormal frequency point, if the spectrum average value of the frequency point is not less than the preset spectrum threshold value, determine that the frequency point is an abnormal frequency point;

[0025] When an abnormal frequency point exists, a target sub-antenna unit is determined in each of the sub-antenna units, and a collection direction of the target sub-antenna unit is used as an interference source direction, and an electromagnetic interference detection result including the interference source direction is generated;

[0026] When there is no abnormal frequency point, an electromagnetic interference detection result without electromagnetic interference is generated.

[0027] In the above device, optionally, the host computer executes a process of determining a target sub-antenna unit in each of the sub-antenna units, comprising:

[0028] The host computer obtains the spectrum value of each of the sub-antenna units at the abnormal frequency point, and determines the sub-antenna unit corresponding to the maximum spectrum value as the target sub-antenna unit.

[0029] In the above device, optionally, the sub-antenna unit is a broadband circularly polarized directional antenna.

[0030] In the above device, optionally, the spectrum monitoring module includes a down-converter, an analog / digital converter and a microprocessor;

[0031] The down converter is used to down-convert the received RF analog signal and send the down-converted RF analog signal to the analog / digital converter;

[0032] The analog / digital converter is used to digitally collect the received radio frequency analog signal after down-conversion processing, and then input the collected waveform data into the microprocessor;

[0033] The microprocessor is used to communicate with the host computer, and perform spectrum analysis on the received waveform data based on the state control instruction sent by the host computer, obtain the spectrum data of the sub-antenna unit corresponding to the RF analog signal, and feed back the spectrum data to the host computer.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] The electromagnetic interference detector device provided by the present invention uses the sub-antenna units in the directional antenna module to collect electromagnetic signals around the device, and the radio frequency combiner is used to obtain the electromagnetic signal of each sub-antenna unit, and then send the radio frequency analog signal corresponding to the electromagnetic signal of each sub-antenna unit to the spectrum monitoring module; the spectrum monitoring module analyzes each received radio frequency analog signal to obtain the spectrum data of each sub-antenna unit, and then feeds back the spectrum data of each sub-antenna unit to the host computer; the host computer processes each spectrum data and outputs the electromagnetic interference detection result. The device provided by the present invention can directly collect electromagnetic signals without the need for staff to set up collection equipment and monitoring equipment. It can quickly detect whether electromagnetic interference occurs, avoid missing the opportunity of electromagnetic interference due to the construction of collection equipment, improve the accuracy of the detection results, ensure the timeliness of the detection results, and reduce the workload of staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0037] Figure 1 A schematic diagram of the structure of an electromagnetic interference detection device provided by an embodiment of the present invention;

[0038] Figure 2 A schematic diagram of the structure of a spectrum monitoring module provided by an embodiment of the present invention;

[0039] Figure 3 A schematic diagram of the structure of another spectrum monitoring module provided by an embodiment of the present invention;

[0040] Figure 4 A flowchart of a host computer provided in an embodiment of the present invention performing interference amplitude identification based on the average spectrum data and generating an electromagnetic interference detection result based on the identification result;

[0041] Figure 5 A schematic structural diagram of yet another electromagnetic interference detector device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In this application, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0044] Electromagnetic interference in the wireless communication frequency band can have a significant impact on the communication quality. If the interfered communication function involves safety (such as the Internet of Vehicles), the electromagnetic interference at this time may lead to safety accidents, which is a very serious potential risk. Therefore, it is of great significance to monitor and find the source of such electromagnetic interference. However, this type of electromagnetic interference usually has the characteristics of high intensity, no signs of occurrence time, unfixed frequency band, unpredictable interference source, and unpredictable polarization direction, which poses many difficulties and challenges to the design of interference direction-finding detection devices.

[0045] For a specific wireless communication system, the base station or terminal generally outputs indicators such as RSSI, RSRQ, and SINR, which cover some information about the total receiving strength and signal-to-noise ratio, which can be used as a reference. The RSSI, RSRQ, SINR and other information output by the base station / terminal of the wireless communication system reflects the comprehensive indicators within the communication frequency band used, and is the mathematical result obtained after a series of post-processing such as the RF circuit and software algorithm of the analog voltage received by the antenna. Compared with the original electromagnetic spectrum, this type of post-processing output loses a lot of useful information. Therefore, although it can reflect the degradation of communication quality as a whole, it cannot support further analysis of electromagnetic interference characteristics. In addition, in the event of strong interference, even if the terminal recognizes the degradation of communication quality, it has no reliable means to upload warning information to the dispatching end (because the wireless communication it uses has failed at this time), so the operator cannot deploy countermeasures in time.

[0046] When communication quality degrades and electromagnetic interference is suspected, communication engineers will manually collect the on-site environmental spectrum to confirm the background spectrum characteristics. They will then use the direction of the handheld directional antenna to determine the direction of the interference source. This method has a lag and is very likely to miss the time when electromagnetic interference occurs, resulting in inaccurate detection results.

[0047] In addition to the above problems, although the method of manually collecting on-site spectrum to identify interference characteristics is flexible and effective, it also has many limitations. For example, the sporadic nature, timeliness and lag of manual collection of interference often cause the collection action to miss the time when the interference occurs; the intensity of the manually collected spectrum is strongly related to the installation of the monitoring equipment (especially the antenna) of the on-site collection engineer, so the results of the test equipment installed by different people cannot be compared horizontally; when it is necessary to determine the source of interference, the manual collection solution usually relies on the on-site engineer holding a directional antenna and adjusting the direction to determine the relative strength of the spectrum in different directions. This process is difficult to standardize, and the corresponding data recording is also difficult to standardize.

[0048] In order to solve the above-mentioned problems, the present invention provides an electromagnetic interference detection device, which can automatically collect surrounding electromagnetic signals, and then output electromagnetic interference detection results based on the electromagnetic signals. The whole process does not require manual construction of equipment and environment for collecting electromagnetic signals. The surrounding electromagnetic signals can be collected in time, and then the electromagnetic signals are analyzed to obtain the detection results of electromagnetic interference, thereby effectively avoiding missing the opportunity of electromagnetic interference due to the construction of collection equipment and environment, and improving the accuracy of detection results.

[0049] The electromagnetic interference detection device provided by the present invention can be applied to various environments where electromagnetic interference detection is required.

[0050] Reference Figure 1 , is a schematic diagram of the structure of the electromagnetic interference detection device provided in an embodiment of the present invention, and the specific description is as follows.

[0051] The electromagnetic interference detection device provided by the present invention includes a directional antenna module 101 , a radio frequency combiner 102 , a spectrum monitoring module 103 and a host computer 104 .

[0052] The directional antenna module 101 is provided with a plurality of sub-antenna units, and different sub-antenna units are used to collect electromagnetic signals in different directions.

[0053] Multiple sub-antenna units are set in the directional antenna module, and each sub-antenna unit is independent of each other. The output end of each sub-antenna unit is connected to the RF combiner. Each sub-antenna unit in the directional antenna module collects electromagnetic signals around the electromagnetic interference detection device. There are at least two sub-antenna units in the directional antenna module. The more sub-antenna units there are, the more directions are collected, and the more accurate the direction of the electromagnetic interference determined subsequently is.

[0054] When there are two sub-antenna units, the two sub-antenna units distinguish the directions of electromagnetic sources back to back; when the number of sub-antenna units is greater than three, the sub-antenna units are arranged along a circle.

[0055] like Figure 1As shown, four sub-antenna units are arranged in the directional antenna module, and A1-A4 in the figure are all sub-antenna units, and each sub-antenna unit collects electromagnetic signals in different directions. The sub-antenna units in the figure can maintain the directivity of the radiation field pattern within a wide frequency spectrum, and the directivity meets the 4-directional resolution requirement, that is, the 3dB lobe width of a single sub-antenna unit is ≤90°. Preferably, the sub-antenna unit can be a directional antenna, such as a broadband directional antenna, and a typical implementation method is a log-periodic antenna, a Vivaldi antenna, etc. Preferably, the four coaxial lines on the right of the output ends of A1-A4 in the figure are respectively connected to a 4-channel RF combiner.

[0056] Preferably, in order to increase the angular resolution of the direction-finding direction, more sub-antenna units can be set in the directional antenna module. For example, 8 sub-antenna units are set. In this case, 8 sub-antenna units with a 3dB lobe width ≤ 45° are arranged along a circular array. In this case, the direction-finding direction resolution is increased to 8 directions.

[0057] The present invention takes into account that the polarization direction of electromagnetic interference is unknown. If a sub-antenna unit is directly formed by a linearly polarized antenna such as a logarithmic periodic antenna or a Vivaldi antenna, detection failure may occur due to polarization mismatch. Therefore, the sub-antenna unit can also be a broadband circularly polarized directional antenna, thereby significantly reducing the possibility of polarization mismatch.

[0058] The radio frequency combiner 102 is used to obtain the electromagnetic signal collected by each sub-antenna unit, and send a radio frequency analog signal corresponding to the obtained electromagnetic signal to the spectrum monitoring module.

[0059] The RF combiner is a RF electronic switch controlled by a host computer. The RF combiner has multiple working modes, and the working modes correspond one to one with the sub-antenna units.

[0060] The RF combiner is used to receive the state control instructions of the host computer and switch the working mode based on the state control instructions, so as to obtain the electromagnetic signal of the sub-antenna unit corresponding to the working mode in the directional antenna module; the state control instructions correspond to the sub-antenna units one by one.

[0061] It should be noted that different sub-antenna units need to send different state control instructions so that the radio frequency combiner obtains the electromagnetic signal based on the state control instructions.

[0062] Furthermore, the RF combiner includes a plurality of input ports and an output port, the input ports correspond one to one with the sub-antenna units in the directional antenna module, and each input port can form a channel with the output port.

[0063] The RF combiner determines the target input port among the input ports based on the state control instruction, and switches to the working mode corresponding to the target input port, so that the built-in load in the RF combiner absorbs the electromagnetic signals of the sub-antenna units corresponding to other input ports, and the target input port and the output port are turned on to obtain the electromagnetic signal of the sub-antenna unit corresponding to the target input port.

[0064] It should be noted that the radio frequency analog signal sent by the radio frequency combiner to the radio frequency monitoring module may be an acquired electromagnetic signal.

[0065] The working modes correspond to the sub-antenna units one by one, and different working modes obtain electromagnetic signals of different sub-antenna units. The built-in load can be a resistor. The present invention uses the built-in load to absorb the electromagnetic signals of the sub-antenna units that do not correspond to the target input port, thereby ensuring that the RF combiner sends the electromagnetic signal of the sub-antenna unit corresponding to the target input port to the RF monitoring module. As a result, the electromagnetic signals of different sub-antenna units can be sent to the RF monitoring module one by one, thereby avoiding signal confusion of different sub-antenna units and affecting the accuracy of subsequent interference identification.

[0066] For example, Figure 1 Taking 4 sub-antenna units in the RF combiner as an example, the RF combiner includes 4 input ports and one output port, which can be named as a COM port. The upper host computer sends status control instructions in sequence according to each sub-antenna unit to control the output port in the RF combiner and the conduction state of the input port corresponding to the sub-antenna unit in the RF combiner, thereby realizing the corresponding working mode switching to obtain the electromagnetic signal of the corresponding sub-antenna unit.

[0067] Preferably, the RF combiner has four working modes, corresponding to working conditions where the input ports J1-J4 are respectively connected to the COM port.

[0068] The 4 working modes are described as follows:

[0069] Working mode 1: J1 is directly connected to the port output, and the signals of J2, J3, and J4 are absorbed by the built-in 50Ω termination load. At this time, only the signal of J1 channel passes through the RF combiner and is then collected by the spectrum monitoring module.

[0070] Working mode 2: J2 is directly connected to the port output, and the signals of J1, J3, and J4 are absorbed by the built-in 50Ω termination load. At this time, only the signal of J2 channel passes through the RF combiner and is then collected by the spectrum monitoring module.

[0071] Working mode 3: J3 is directly connected to the port output, and the signals of J1, J2, and J4 are absorbed by the built-in 50Ω termination load. At this time, only the signal of J3 channel passes through the RF combiner and is then collected by the spectrum monitoring module.

[0072] Working mode 4: J4 is directly connected to the port output, and the signals of J1, J2, and J3 are absorbed by the built-in 50Ω termination load. At this time, only the signal of J4 channel passes through the RF combiner and is then collected by the spectrum monitoring module.

[0073] For example, in order to increase the angular resolution of the direction-finding direction, the directional antenna module contains more directional antenna units, for example, 8. At this time, the RF combiner is also matched to a larger number of input channels, with 8 input ports J1-J8 and 1 output port COM, and the corresponding working modes are also increased to 8.

[0074] The number of input ports in the RF combiner of the present invention depends on the number of sub-antenna units in the directional antenna module, except Figure 1 The RF combiner and directional antenna module shown, which meet the configuration rules and conditions of the RF combiner and directional antenna module provided by the present invention, are within the protection scope of the present invention.

[0075] The spectrum monitoring module 103 is used to analyze the received RF analog signal, obtain spectrum data of the sub-antenna unit corresponding to the RF analog signal, and feed back the spectrum data to the upper computer.

[0076] The spectrum monitoring module will feed back the spectrum data of each sub-antenna unit to the host computer.

[0077] The spectrum monitoring module is used to receive a frequency sweep instruction corresponding to the state control instruction sent by the host computer, and analyze the received RF analog signal based on the frequency sweep instruction to obtain the spectrum data of the sub-antenna unit corresponding to the frequency sweep instruction, and the frequency sweep instruction corresponds to the state control instruction one by one; preferably, after the host computer sends the state control instruction to the RF combiner, it also needs to send a frequency sweep instruction to the RF monitoring module, so that the RF combiner obtains the electromagnetic signal of the sub-antenna unit based on the state control instruction, and then sends the RF analog signal to the RF monitoring module, so that the RF monitoring module processes the received RF analog signal based on the frequency sweep instruction, and then feeds back the spectrum data to the host computer.

[0078] Reference Figure 2 , which is a structural schematic diagram of a spectrum monitoring module provided in an embodiment of the present invention. As shown in the figure, the spectrum monitoring module includes a downconverter, an analog / digital converter and a microprocessor (MCU in the figure); wherein the downconverter is composed of a local oscillator, a mixer and an intermediate frequency filter.

[0079] The down converter is used to down-convert the received RF analog signal and send the down-converted RF analog signal to the analog / digital converter. It should be noted that the purpose of down-conversion is to reduce the frequency of the spatial electromagnetic wave collected by the antenna to within the bandwidth of the ADC so that it can be correctly collected. Preferably, the present invention also supports the use of cascaded down converters with multiple stages of decreasing working frequency bands, so as to widen the upper limit of the working frequency.

[0080] The analog / digital converter is used to digitally acquire the received RF analog signal after down-conversion processing, and then input the acquired waveform data into the microprocessor.

[0081] The microprocessor is used to communicate with the host computer, and perform spectrum analysis on the received waveform data based on the state control instruction sent by the host computer, obtain the spectrum data of the sub-antenna unit corresponding to the radio frequency analog signal, and feed back the spectrum data to the host computer.

[0082] It should be noted that the mixer in the down converter receives the RF analog signal sent by the RF combiner; the microprocessor receives the frequency sweep command sent by the host computer, and feeds back the spectrum data obtained after the spectrum analysis to the host computer.

[0083] It should be noted that the spectrum monitoring module has multiple implementation methods. In the application scenario of electromagnetic interference detection, spectrum monitoring modules built using other principles also fall within the protection scope of the present invention. Figure 3 , is a structural schematic diagram of another spectrum monitoring module provided in an embodiment of the present invention, in which a spectrum monitoring module constructed based on a detector is shown; the implementation methods of the spectrum monitoring module in other implementation methods are not exemplified one by one in the present invention.

[0084] The host computer 104 is used to process each spectrum data after receiving the spectrum data of each sub-antenna unit, and output the electromagnetic interference detection result.

[0085] The host computer provided in the embodiment of the present invention is a PC or an industrial computer that integrates control commands and data post-processing functions; the host computer is used to control the RF combiner, and controls the RF combiner to switch the working state at a specific timing by communicating with the RF combiner and issuing instructions; it is also used to control the spectrum monitoring module, and controls the spectrum monitoring module to complete spectrum scanning of the monitoring frequency band with specific sweep parameters by communicating with the MCU of the spectrum monitoring module and issuing sweep instructions; it is also used to receive spectrum data and perform post-processing, specifically: communicating with the MCU of the spectrum monitoring module and receiving the spectrum data returned by the latter, and performing specific post-processing on the received data, such as storing in a specific format, identifying spectrum abnormality features, uploading to a cloud server, etc.

[0086] It should be noted that the host computer performs averaging processing on each spectrum data to obtain average spectrum data, performs interference amplitude identification based on the average spectrum data, and generates electromagnetic interference detection results based on the identification results.

[0087] Reference Figure 4 , which is a flowchart of the host computer provided in an embodiment of the present invention executing interference amplitude identification based on the average spectrum data and generating electromagnetic interference detection results based on the identification results, and is specifically described as follows:

[0088] S201. For the spectrum average value of each frequency point in the average spectrum data, determine whether the spectrum average value of the frequency point is less than a preset spectrum threshold. If the spectrum average value of the frequency point is less than the preset spectrum threshold, determine that the frequency point is not an abnormal frequency point. If the spectrum average value of the frequency point is not less than the preset spectrum threshold, determine that the frequency point is an abnormal frequency point.

[0089] S202, determine whether there is an abnormal frequency point; when there is an abnormal frequency point, execute S203; when there is no abnormal frequency point, execute S204.

[0090] S203: Determine a target sub-antenna unit among the sub-antenna units, and use the collection direction of the target sub-antenna unit as the interference source direction, to generate an electromagnetic interference detection result including the interference source direction.

[0091] S204: Generate an electromagnetic interference detection result without electromagnetic interference.

[0092] It should be noted that the preset spectrum threshold here can be set by the task, or the system can first collect a large amount of data under normal conditions without electromagnetic interference to calibrate the normal background electromagnetic spectrum of the monitoring scene; or use unsupervised learning to determine the spectrum characteristics of the state without electromagnetic interference, and use the training results to determine whether the latest collected data is abnormal. By presetting the spectrum threshold or integrating the unsupervised learning algorithm, the alarm information of the spectrum abnormality state is output in real time.

[0093] Preferably, when electromagnetic interference is determined, an alarm message can be issued to inform the staff of the electromagnetic interference. The electromagnetic interference detection device provided by the present invention can not only identify whether there is electromagnetic interference, but also identify the direction of the interference, and can indicate the interference direction to the staff.

[0094] The electromagnetic interference detector device provided by the present invention uses the sub-antenna units in the directional antenna module to collect electromagnetic signals around the device, and the radio frequency combiner is used to obtain the electromagnetic signal of each sub-antenna unit, and then send the radio frequency analog signal corresponding to the electromagnetic signal of each sub-antenna unit to the spectrum monitoring module; the spectrum monitoring module analyzes each received radio frequency analog signal to obtain the spectrum data of each sub-antenna unit, and then feeds back the spectrum data of each sub-antenna unit to the host computer; the host computer processes each spectrum data and outputs the electromagnetic interference detection result. The device provided by the present invention can directly collect electromagnetic signals without the need for staff to set up collection equipment and monitoring equipment. It can quickly detect whether electromagnetic interference occurs, avoid missing the opportunity of electromagnetic interference due to the construction of collection equipment, improve the accuracy of the detection results, ensure the timeliness of the detection results, and reduce the workload of staff.

[0095] Preferably, refer to Figure 5 , is a schematic diagram of the structure of another electromagnetic interference detector device provided in an embodiment of the present invention, which is similar to Figure 1 The difference between the electromagnetic interference detector device shown is that a radio frequency low noise amplifier is added, and a radio frequency low noise amplifier LNA is connected in series between the directional antenna module and the radio frequency combiner to increase the signal-to-noise ratio; it should be noted that the spectrum monitoring module hardware has background noise, and if the signal strength received by the antenna is lower than the background noise of the device, it will lead to indistinguishability; the radio frequency low noise amplifier LNA can amplify the antenna received signal to make its strength higher than the background noise of the device. Therefore, the radio frequency low noise amplifier LNA improves the overall small signal resolution capability of the system.

[0096] In order to specifically illustrate the working process of the electromagnetic interference detector device provided by the present invention, an example is provided here for illustration, and the specific description is as follows:

[0097] S1. Plan the monitoring frequency band and configure the host computer instructions according to the actual communication application.

[0098] S2. Perform a round of spectrum acquisition. The specific steps are as follows:

[0099] S210, the host computer sends a control instruction to the RF combiner to switch the RF combiner to state 1. At this time, only the collected signal of the sub-antenna unit A1 is connected to the spectrum monitoring module through the COM output port, and then steps S211-S212 are executed.

[0100] S211. The host computer sends a control instruction to the spectrum monitoring module, so that the spectrum monitoring module completes a spectrum scan within a monitoring frequency band.

[0101] S212: The host computer receives and records the data sent back by the spectrum monitoring module.

[0102] S220, the host computer sends a control instruction to the RF combiner to switch the RF combiner to state 2. At this time, only the collected signal of the sub-antenna unit A2 is connected to the spectrum monitoring module through the COM output port, and steps S211-S212 are repeated.

[0103] S230, the host computer sends a control instruction to the RF combiner to switch the RF combiner to state 3. At this time, only the collected signal of the sub-antenna unit A3 is connected to the spectrum monitoring module through the COM output port, and steps S211-S212 are repeated.

[0104] S240, the host computer sends a control instruction to the RF combiner to switch the RF combiner to state 4. At this time, only the collected signal of the sub-antenna unit A4 is connected to the spectrum monitoring module through the COM output port, and steps S211-S212 are repeated.

[0105] S3, interference amplitude identification: the host computer averages the spectrum data returned by S210, S220, S230, and S240, and compares the average value with the preset spectrum threshold. If the average value is higher than the preset spectrum threshold at a certain frequency point / frequency band, it is judged that the electromagnetic interference at this frequency point exceeds the limit.

[0106] S4, Determination of interference direction source: For abnormal frequency points where interference exceeds the limit, compare S210, S220, S230, and S240 to obtain the relative size of the spectrum data at the frequency point, and the main lobe direction of the antenna pattern corresponding to the largest reading is the interference source direction. For example: If the intensity of the spectrum data of S210 at the abnormal frequency point far exceeds the intensity corresponding to S220, S230, and S240, it means that the main lobe direction of the pattern of sub-antenna unit A1 is the interference source direction.

[0107] S5, post-processing and uploading of data. The spectrum raw data, spectrum anomaly identification, interference source direction identification, collection time and other information obtained in S2-S4 are stored locally in a predetermined format or uploaded to the cloud server.

[0108] S6. Repeat S2-S5 in a cycle to perform normal monitoring.

[0109] The electromagnetic interference detection device provided by the embodiment of the present invention can determine the interference source defense line under the premise of identifying electromagnetic interference. Compared with the solution of manual collection by handheld antenna, the system can operate unmanned in a steady state and continuously record, which is very suitable for monitoring occasional interference. The application of the present invention can solve the current problem of untimely interference identification, and timely identify whether there is interference. The data collected during the identification process has the characteristics of standardization and normalization, thereby improving the accuracy of interference identification results, which is of great significance for communication fault analysis and communication quality monitoring.

[0110] It should be noted that the information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards of relevant countries and regions.

[0111] The specific implementation processes and derivative methods of the above-mentioned embodiments are all within the protection scope of the present invention.

[0112] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0113] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0114] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electromagnetic interference detection device, characterized in that: include: Directional antenna module, RF combiner, spectrum monitoring module and host computer; The directional antenna module is provided with a plurality of sub-antenna units, and different sub-antenna units are used to collect electromagnetic signals in different directions; The RF combiner is used to obtain the electromagnetic signal collected by each of the sub-antenna units, and send a RF analog signal corresponding to the obtained electromagnetic signal to the spectrum monitoring module; The spectrum monitoring module is used to analyze the received radio frequency analog signal, obtain the spectrum data of the sub-antenna unit corresponding to the radio frequency analog signal, and feed back the spectrum data to the host computer; The host computer is used to process each spectrum data after receiving the spectrum data of each sub-antenna unit, and output the electromagnetic interference detection result.

2. The device according to claim 1, characterized in that Also includes: A radio frequency low noise amplifier is connected in series between the directional antenna module and the radio frequency combiner; The radio frequency low noise amplifier is used to increase the signal-to-noise ratio.

3. The device according to claim 1, characterized in that The process of the radio frequency combiner being used to obtain the electromagnetic signal collected by each of the sub-antenna units includes: The RF combiner is used to receive the state control instruction of the host computer, and switch the working mode based on the state control instruction, and obtain the electromagnetic signal of the sub-antenna unit corresponding to the working mode in the directional antenna module; the state control instruction corresponds to the sub-antenna unit one by one.

4. The device according to claim 3, characterized in that The process in which the RF combiner switches the working mode based on the state control instruction and obtains the electromagnetic signal of the sub-antenna unit corresponding to the working mode in the directional antenna module includes: The radio frequency combiner comprises a plurality of input ports and an output port, wherein the input ports correspond one to one with the sub-antenna units; The RF combiner determines a target input port among the input ports based on the state control instruction, and switches to an operating mode corresponding to the target input port, so that a built-in load in the RF combiner absorbs electromagnetic signals of sub-antenna units corresponding to other input ports, and the target input port and the output port are turned on to obtain electromagnetic signals of the sub-antenna unit corresponding to the target input port.

5. The device according to claim 3, characterized in that The spectrum monitoring module performs a process of analyzing the received radio frequency analog signal to obtain spectrum data of the sub-antenna unit corresponding to the radio frequency analog signal, including: The spectrum monitoring module is used to receive a frequency sweep instruction corresponding to the state control instruction sent by the host computer, and analyze the received RF analog signal based on the frequency sweep instruction to obtain spectrum data of the sub-antenna unit corresponding to the frequency sweep instruction, and the frequency sweep instruction corresponds to the state control instruction one by one.

6. The device according to claim 1, characterized in that The host computer processes each of the spectrum data and outputs the electromagnetic interference detection result, including: The host computer performs averaging processing on each of the spectrum data to obtain average spectrum data, performs interference amplitude identification based on the average spectrum data, and generates an electromagnetic interference detection result based on the identification result.

7. The device according to claim 6, characterized in that The host computer performs interference amplitude identification based on the average spectrum data, and generates an electromagnetic interference detection result based on the identification result, including: For the spectrum average value of each frequency point in the average spectrum data, determine whether the spectrum average value of the frequency point is less than a preset spectrum threshold value, if the spectrum average value of the frequency point is less than the preset spectrum threshold value, determine that the frequency point is not an abnormal frequency point, if the spectrum average value of the frequency point is not less than the preset spectrum threshold value, determine that the frequency point is an abnormal frequency point; When an abnormal frequency point exists, a target sub-antenna unit is determined in each of the sub-antenna units, and a collection direction of the target sub-antenna unit is used as an interference source direction, and an electromagnetic interference detection result including the interference source direction is generated; When there is no abnormal frequency point, an electromagnetic interference detection result without electromagnetic interference is generated.

8. The device according to claim 7, characterized in that The host computer executes a process of determining a target sub-antenna unit in each of the sub-antenna units, including: The host computer obtains the spectrum value of each of the sub-antenna units at the abnormal frequency point, and determines the sub-antenna unit corresponding to the maximum spectrum value as the target sub-antenna unit.

9. The device according to claim 1, characterized in that The sub-antenna unit is a broadband circularly polarized directional antenna.

10. The device according to claim 1, characterized in that The spectrum monitoring module includes a down converter, an analog / digital converter and a microprocessor; The down converter is used to down-convert the received RF analog signal and send the down-converted RF analog signal to the analog / digital converter; The analog / digital converter is used to digitally collect the received radio frequency analog signal after down-conversion processing, and then input the collected waveform data into the microprocessor; The microprocessor is used to communicate with the host computer, and perform spectrum analysis on the received waveform data based on the state control instruction sent by the host computer, obtain the spectrum data of the sub-antenna unit corresponding to the RF analog signal, and feed back the spectrum data to the host computer.

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