Detection method and system for differential positioning of electromagnetic interference source through double electric field probes

Abstract

The invention discloses a detection method and system for differential positioning of an electromagnetic interference source through double electric field probes, and relates to the technical field of intelligent vehicle electromagnetic interference positioning detection, and the method comprises the steps: setting a plurality of groups of detection point locations according to a detection environment; the double-probe interference source detection device is placed on a group of detection point positions, positioning data are obtained through a differential positioning method, and the differential positioning method comprises the steps that the electric field intensity of two electric field probes in the double-probe interference source detection device is obtained, and the direction of an electromagnetic interference source is deduced through the electric field intensity difference value; and performing data fusion calculation on the multiple groups of positioning data by using the interference algorithm model, eliminating the influence of the secondary interference source, and obtaining a positioning result of the main interference source. According to the invention, the distance position of the electromagnetic interference source is detected and positioned by measuring and analyzing the change of the electric field in the space, and the accuracy of interference source positioning is improved by using the interference algorithm model.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic interference positioning detection for smart vehicles, and in particular to a detection method and system for differentially positioning an electromagnetic interference source using dual electric field probes. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] With the rapid development of smart vehicles, many electronic control units (ECUs) have been integrated into vehicles, among which the power system, braking system, entertainment system and various high-power sensing sensors (lidar, multi-function cameras) may become potential sources of electromagnetic interference. The positioning function is a prerequisite for smart vehicles to enable the automatic driving function, and the positioning antenna is very susceptible to the influence of various electromagnetic interference sources, which in turn causes positioning deviations or slow positioning convergence, resulting in abnormalities in other functions. In addition, due to the limited space inside the car, it is difficult to carry out effective electromagnetic shielding design. Therefore, timely discovery of the main interference sources during the development process is very important for the later development and use of the vehicle that is strongly related to the positioning function.

[0004] At present, the existing research on the positioning of electromagnetic interference sources of smart cars can only determine the approximate direction, and is affected by multiple other secondary interference sources, and the exact location of the interference source cannot be determined. Therefore, how to accurately locate the interference source of smart cars has become a problem that needs to be urgently solved in existing technologies. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a detection method and system for differentially locating electromagnetic interference sources using dual electric field probes, which detects and locates the distance position of the electromagnetic interference source by measuring and analyzing the changes in the electric field in space, and uses an interference algorithm model to improve the accuracy of interference source positioning.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] A first aspect of the present invention provides a detection method for differentially locating an electromagnetic interference source using a dual electric field probe, comprising the following steps:

[0008] Set up several groups of detection points according to the detection environment;

[0009] The dual-probe interference source detection device is placed on a set of detection points, and the positioning data is obtained by a differential positioning method, wherein the differential positioning method is to obtain the electric field strength of the two electric field probes in the dual-probe interference source detection device, and use the difference in electric field strength to infer the direction of the electromagnetic interference source;

[0010] The interference algorithm model is used to perform data fusion calculation on multiple groups of positioning data, eliminate the influence of secondary interference sources, and obtain the positioning result of the main interference source.

[0011] Furthermore, the detection points have certain spatial symmetry and spatial uniformity, and multiple groups of detection points are arranged using a rectangular or circular arrangement.

[0012] Furthermore, the electric field probe is calibrated using a calibration electric field sensor before operation.

[0013] Furthermore, the dual-probe interference source detection device includes two electric field probes and an IMU unit. The two electric field probes have the same induction frequency and sensitivity. The two electric field probes are fixed at both ends of a rigid connecting rod. At the same time, the connecting rod adjusts the position of the electric field probes by free rotation. The IMU unit is installed in the middle position of the connecting rod to record the posture of the connecting rod when collecting data.

[0014] Furthermore, the dual-probe interference source detection device is placed on a set of detection points, and the specific steps of obtaining positioning data by the differential positioning method are as follows:

[0015] Place the dual-probe interference source detection device at the test point planned in advance and start the data acquisition program;

[0016] Record the interference intensity data of the two electric field probes and the IMU data, and rotate and adjust the connecting rod posture to record the change of interference intensity;

[0017] The direction where the difference between the two electric field probes is the largest is used to preliminarily determine the direction of the main interference source;

[0018] Move point by point to the detection points planned in advance according to the actual environment. During the movement, the interference intensity is also recorded in real time, but there is no need to rotate. The electric field probe interference intensity data and IMU data are recorded at multiple groups of detection points.

[0019] Furthermore, when the detection intensities of the electric field probes at both ends of the connecting rod are the same, the interference source is on the vertical line of the connecting rod. When the intensity difference between the two ends of the connecting rod is the largest, the interference source is on the extension line of the connecting rod.

[0020] Furthermore, the specific steps of using the interference algorithm model to perform data fusion calculation on multiple sets of positioning data are as follows:

[0021] Preprocess the collected data and perform coordinate system one operation;

[0022] The data after coordinate system one is input into the interference algorithm model, and the electric field characteristics are extracted and calculated using the deep learning algorithm to obtain the direction map;

[0023] The calculated pattern is analyzed to determine the exact location and strength of the interference source.

[0024] A second aspect of the present invention provides a detection system for differentially locating electromagnetic interference sources using dual electric field probes, comprising:

[0025] A site setting module is configured to set a number of detection points according to the detection environment;

[0026] The data acquisition module is configured to place the dual-probe interference source detection device on a set of detection points and obtain positioning data by a differential positioning method, wherein the differential positioning method is to obtain the electric field strength of two electric field probes in the dual-probe interference source detection device and infer the direction of the electromagnetic interference source by using the difference in electric field strength;

[0027] The interference elimination module is configured to use the interference algorithm model to perform data fusion calculation on multiple groups of positioning data, eliminate the influence of secondary interference sources, and obtain the positioning result of the main interference source.

[0028] The third aspect of the present invention provides a medium having a program stored thereon, which, when executed by a processor, implements the steps in the detection method for differentially locating an electromagnetic interference source using a dual electric field probe as described in the first aspect of the present invention.

[0029] The fourth aspect of the present invention provides a device, including a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the steps in the detection method for differentially locating electromagnetic interference sources using dual electric field probes as described in the first aspect of the present invention are implemented.

[0030] One or more of the above technical solutions have the following beneficial effects:

[0031] The present invention discloses a detection method and system for differentially locating electromagnetic interference sources using dual electric field probes. The dual electric field probe structure is installed on a rotatable bracket to detect intensity changes during the installation process. Data collection operations are performed at different observation points, and the collected data are finally input into a model composed of a deep learning algorithm for position calculation and data fusion to derive the final spatial position information of the interference source, thereby improving the detection accuracy and reducing the complexity of the equipment.

[0032] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0034] Figure 1This is a detection principle diagram of the dual-probe interference source detection device in Example 1 of the present invention. DETAILED DESCRIPTION

[0035] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or their combinations;

[0037] Embodiment 1:

[0038] The electromagnetic interference generated by the on-board electronic devices of larger tools will have a certain impact on the normal operation of other electromagnetic sensitive components. Therefore, it is very necessary to perform electromagnetic compatibility (EMC) testing on vehicles. How to quickly find the radiation source during the vehicle design and development process and the required equipment should be relatively easy to operate has become an important exploration direction. Embodiment 1 of the present invention provides a detection method for differential positioning of electromagnetic interference sources using dual electric field probes. The data sensing part of the electromagnetic interference detection system is composed of dual electric field probes and combined with IMU. The distance position of the electromagnetic interference source is detected and located by measuring and analyzing the changes in the electric field in space. The system uses the differential measurement method of the dual probes to determine the direction of the interference source, and uses the IMU to locate the initial detection position, record the electromagnetic intensity data, and then use the deep learning model to construct a three-dimensional electromagnetic interference image, and finally realize the rapid positioning of the interference source.

[0039] The specific steps include:

[0040] Step 1: Set up several groups of detection points according to the detection environment.

[0041] Design the points to be detected according to the actual detection environment. The number of points should be no less than 8 groups to facilitate the subsequent position calculation. The detection points have a certain spatial symmetry and spatial uniformity. Use rectangular or circular arrangements to arrange multiple groups of detection points.

[0042] Step 2: Place the dual-probe interference source detection device on a set of detection points and obtain positioning data through the differential positioning method.

[0043] Among them, the differential positioning method is to obtain the electric field strength of the two electric field probes in the dual-probe interference source detection device, and use the difference in electric field strength to infer the direction of the electromagnetic interference source.

[0044] Step 2.1: Set up a dual-probe interference source detection device. In this embodiment, the dual-probe interference source detection device includes two electric field probes and an IMU unit. The two electric field probes have the same induction frequency and sensitivity. The two electric field probes are fixed at both ends of a rigid connecting rod. The length of the connecting rod is about ten centimeters. At the same time, the connecting rod can adjust the position of the electric field probe by free rotation. The IMU unit is installed in the middle position of the connecting rod to record the posture of the connecting rod when collecting data. It also includes a portable data acquisition device for collecting electric field probe data and IMU data at different points.

[0045] Step 2.2: Before working, the electric field probe is calibrated using a calibration electric field sensor.

[0046] The calibration process is as follows: Determine the calibration point according to the frequency range of the calibrated field probe or the calibration electric field sensor. Select at least three frequency values ​​per decade range between the lowest frequency and the highest frequency as calibration points. Place the calibration electric field sensor in the field uniformity area of ​​the calibration electric field, adjust the input signal level of the calibration electric field, obtain the forward input power and reverse input power of the calibration electric field sensor through the power meter, and calculate the standard field strength using the TEM chamber standard field method.

[0047] During the calibration process, the calibration factor of the electric field probe can be determined by comparing the field strength value measured by the electric field probe with the standard field strength value calculated by the TEM chamber standard field method. This calibration factor is used to adjust the measured value of the electric field probe to make it consistent with the standard field strength, thereby improving the accuracy of the measurement.

[0048] Step 2.3: Get positioning data through differential positioning method. The specific interference source detection principle is: use two electric field probes separated from each other and fixed in distance to measure the electric field in space, and convert it into a voltage signal for output. The electric field probes are fixed at both ends of the connecting rod, and the IMU unit is fixed in the middle. Rotate the connecting rod and compare the difference in the measurement signals of the two probes.

[0049] Differential signal: The two electric field probes at both ends of the connecting rod are probe A and probe B. The electric field strength measured by probe A and probe B at the same point are EA and EB respectively. The difference between the two is ΔE=EA-EB. The direction of the electromagnetic interference source can be inferred by ΔE.

[0050] When the detection strength of the probes at both ends is the same, the interference source is on the vertical line of the connecting rod. When the strength difference between the two ends is the largest, it is on the extension line of the connecting rod.

[0051] Due to the existence of secondary interference sources, there must be deviations in the direction calculated above. The direction of the interference source at different positions can be calculated by constantly changing the main test points. The position of the interference source can be calculated using the phase difference. At the same time, the voltage difference at the maximum difference is calculated to determine the distance. The larger the voltage difference, the closer it is to the interference source. Among them, the IMU unit is used to track the movement of the probe and provide accurate position information and attitude data.

[0052] In a specific implementation, the dual-probe interference source detection device is placed on a set of detection points, and the specific steps of obtaining positioning data by the differential positioning method are as follows:

[0053] Step 2.3.1: Place the dual-probe interference source detection device at the test point planned in advance and start the data acquisition program.

[0054] Step 2.3.2: Record the interference intensity data of the two electric field probes and the IMU data, and rotate and adjust the connecting rod posture to record the change in interference intensity.

[0055] Step 2.3.3: The direction where the difference in the strength of the two electric field probes is the largest is used to preliminarily determine the direction of the main interference source.

[0056] Step 2.3.4: Move point by point to the detection points planned in advance according to the actual environment. During the movement, the interference intensity is also recorded in real time, but there is no need to rotate. The electric field probe interference intensity data and IMU data are recorded at multiple groups of detection points.

[0057] Step 3: Use the interference algorithm model to perform data fusion calculation on multiple sets of positioning data, eliminate the influence of secondary interference sources, and obtain the positioning result of the main interference source.

[0058] Step 3.1: Preprocess the collected data and perform coordinate system one operation.

[0059] Step 3.1.1: Preprocess the data from the electric field probe and IMU, including normalization, filtering, and denoising, to improve data quality and model robustness.

[0060] Step 3.1.2: Perform coordinate system 1 on the preprocessed data to obtain data in the same coordinate system to facilitate directional pattern calculation.

[0061] Step 3.2: Input the data after coordinate system one into the interference algorithm model, use the deep learning algorithm to extract the electric field characteristics and calculate to obtain the directional map.

[0062] Step 3.2.1: Use the deep learning model to extract features from the preprocessed data.

[0063] In this embodiment, a CNN model is used as the interference algorithm model framework, and an LSTM layer is added to the interference algorithm model to capture the temporal relationship between features. The extracted features include the intensity and direction of the electric field and its changes over time.

[0064] Step 3.2.3: Calculate the directional pattern using the extracted features and spatial layout information. The directional pattern can show how the electric field strength changes with angle, thereby inferring the direction of the interference source.

[0065] Specifically, the distribution of the electric field is analyzed by combining the spatial layout of the electric field probe. That is, through the learning process, the extracted features are enhanced, useful information is retained, and useless information is eliminated to reduce the amount of calculation and make the classifier more effective.

[0066] This embodiment also uses a clustering algorithm such as the K-means algorithm to cluster the features to identify different patterns or regions in the electric field.

[0067] The specific steps include:

[0068] Randomly select K data points as initial centroids.

[0069] The distance of each data point to each centroid is calculated and assigned to the cluster corresponding to the nearest centroid.

[0070] For all data points in each cluster, calculate their mean and update the mean as the new centroid.

[0071] Repeat the above steps until the centroid converges (i.e., the centroid no longer changes or changes very little).

[0072] For each data point, calculate the distance between the cluster center and the classification feature. You can use methods such as cosine similarity.

[0073] The nearest cluster center point and classification feature are selected as the final category of the data point.

[0074] The cluster centers and classification features are updated to prepare for the next fusion. This embodiment may use any update strategy, such as retraining clustering and classification algorithms.

[0075] Through the fusion of the above clustering and classification, the final category of each data point can be determined, which can correspond to different interference sources. By analyzing these categories and their characteristics, the location and strength of the interference source can be inferred. For example, if most of the data points in a category show high interference intensity, then this category may correspond to a strong interference source. Through a geographic information system (GIS) or similar technology, these data points can be mapped to actual locations, thereby determining the exact location and strength of the interference source.

[0076] After adding the clustering algorithm, the accuracy of the directional map is further improved.

[0077] Step 3.3: Analyze the calculated pattern to determine the exact location and strength of the interference source.

[0078] The radiation pattern (beam pattern) describes the radiation intensity or receiving sensitivity of the antenna array in different directions. Based on the characteristics of the radiation pattern, it can be determined that the electromagnetic interference mainly comes from the radio signals on the ground and in space in the direction of the strong interference source. By measuring the spectrum from the ground in the direction of the strong electromagnetic interference source and selecting the position of the strongest interference source in the measured spectrum, the location of the interference source can be determined.

[0079] It should be noted that using directional patterns to determine the location and strength of interference sources is a common method in the art, so the specific steps will not be repeated here.

[0080] This embodiment uses dual electric field probes to perform electromagnetic interference detection in coordination, which can achieve rapid location and measurement of interference sources and improve the accuracy and reliability of detection. Using signal processing technology and deep learning algorithms, it can effectively meet the needs of electromagnetic interference detection in complex environments and provide important guarantees for the electromagnetic compatibility of various electronic equipment and systems.

[0081] Embodiment 2:

[0082] Embodiment 2 of the present invention provides a detection system for differentially locating electromagnetic interference sources using dual electric field probes, comprising:

[0083] A site setting module is configured to set a number of detection points according to the detection environment;

[0084] The data acquisition module is configured to place the dual-probe interference source detection device on a set of detection points and obtain positioning data by a differential positioning method, wherein the differential positioning method is to obtain the electric field strength of two electric field probes in the dual-probe interference source detection device and infer the direction of the electromagnetic interference source by using the difference in electric field strength;

[0085] The interference elimination module is configured to use the interference algorithm model to perform data fusion calculation on multiple groups of positioning data, eliminate the influence of secondary interference sources, and obtain the positioning result of the main interference source.

[0086] Embodiment three:

[0087] Embodiment 3 of the present invention provides a medium on which a program is stored. When the program is executed by a processor, the steps of the detection method for differentially locating an electromagnetic interference source using a dual electric field probe as described in Embodiment 1 of the present invention are implemented.

[0088] Embodiment 4:

[0089] Embodiment 4 of the present invention provides a device, including a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the steps in the detection method for differentially locating electromagnetic interference sources using dual electric field probes as described in Embodiment 1 of the present invention are implemented.

[0090] The steps involved in the above embodiments 2, 3 and 4 correspond to the method embodiment 1. For the specific implementation methods, please refer to the relevant description part of embodiment 1.

[0091] Those skilled in the art should understand that the modules or steps of the present invention described above can be implemented by a general-purpose computer device, or alternatively, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. The present invention is not limited to any specific combination of hardware and software.

[0092] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A detection method for differentially locating electromagnetic interference sources using dual electric field probes, characterized in that: The following steps are involved: Set up several groups of detection points according to the detection environment; The dual-probe interference source detection device is placed on a set of detection points, and the positioning data is obtained by a differential positioning method, wherein the differential positioning method is to obtain the electric field strength of the two electric field probes in the dual-probe interference source detection device, and use the difference in electric field strength to infer the direction of the electromagnetic interference source; The interference algorithm model is used to perform data fusion calculation on multiple groups of positioning data, eliminate the influence of secondary interference sources, and obtain the positioning result of the main interference source.

2. The detection method for differentially locating electromagnetic interference sources using dual electric field probes as claimed in claim 1, characterized in that: The detection points have certain spatial symmetry and spatial uniformity, and multiple groups of detection points are arranged in a rectangular or circular arrangement.

3. The detection method for differentially locating electromagnetic interference sources using dual electric field probes as claimed in claim 1, characterized in that: The electric field probe is calibrated using a calibration electric field sensor before operation.

4. The detection method for differentially locating electromagnetic interference sources using dual electric field probes as claimed in claim 1, characterized in that: The dual-probe interference source detection device includes two electric field probes and an IMU unit. The two electric field probes have the same induction frequency and sensitivity. The two electric field probes are fixed at both ends of a rigid connecting rod. At the same time, the connecting rod can adjust the position of the electric field probe by free rotation. The IMU unit is installed in the middle position of the connecting rod to record the connecting rod posture when collecting data.

5. The detection method for differentially locating electromagnetic interference sources using dual electric field probes as claimed in claim 4, characterized in that: The specific steps of placing the dual-probe interference source detection device on a set of detection points and obtaining positioning data through the differential positioning method are as follows: Place the dual-probe interference source detection device at the test point planned in advance and start the data acquisition program; Record the interference intensity data of the two electric field probes and the IMU data, and rotate and adjust the connecting rod posture to record the change of interference intensity; The direction where the difference between the two electric field probes is the largest is used to preliminarily determine the direction of the main interference source; Move point by point to the detection points planned in advance according to the actual environment. During the movement, the interference intensity is also recorded in real time, but there is no need to rotate. The electric field probe interference intensity data and IMU data are recorded at multiple groups of detection points.

6. The detection method for differentially locating electromagnetic interference sources using dual electric field probes as claimed in claim 1, characterized in that: When the detection intensity of the electric field probes at both ends of the connecting rod is the same, the interference source is on the vertical line of the connecting rod. When the intensity difference between the two ends of the connecting rod is the largest, the interference source is on the extension line of the connecting rod.

7. The detection method for differentially locating electromagnetic interference sources using dual electric field probes as claimed in claim 1, characterized in that: The specific steps of using the interference algorithm model to perform data fusion calculation on multiple sets of positioning data are as follows: Preprocess the collected data and perform coordinate system one operation; The data after coordinate system one is input into the interference algorithm model, and the electric field characteristics are extracted and calculated using the deep learning algorithm to obtain the direction map; The calculated pattern is analyzed to determine the exact location and strength of the interference source.

8. A detection system for differentially locating electromagnetic interference sources using dual electric field probes, characterized in that: include: A site setting module is configured to set a number of detection points according to the detection environment; The data acquisition module is configured to place the dual-probe interference source detection device on a set of detection points and obtain positioning data by a differential positioning method, wherein the differential positioning method is to obtain the electric field strength of two electric field probes in the dual-probe interference source detection device and infer the direction of the electromagnetic interference source by using the difference in electric field strength; The interference elimination module is configured to use the interference algorithm model to perform data fusion calculation on multiple groups of positioning data, eliminate the influence of secondary interference sources, and obtain the positioning result of the main interference source.

9. A computer-readable storage medium, characterized in that: A plurality of instructions are stored therein, and the instructions are suitable for being loaded by a processor of a terminal device and executed by the detection method for differentially locating an electromagnetic interference source using a dual electric field probe as described in any one of claims 1-7.

10. A terminal device, characterized in that: It includes a processor and a computer-readable storage medium, the processor is used to implement various instructions; the computer-readable storage medium is used to store multiple instructions, and the instructions are suitable for being loaded by the processor and executing the detection method for differentially locating electromagnetic interference sources using a dual electric field probe as described in any one of claims 1-7.

Images