Radiation source positioning method, system and device, readable storage medium and positioning equipment

Abstract

The invention relates to a radiation source positioning method, system and device, a readable storage medium and positioning equipment, and the method comprises the steps: carrying out the signal collection of a radiation source of a to-be-detected vehicle through signal receiving equipment, and obtaining a target signal, and enabling the target signal to comprise a noise signal and a radiation signal of the radiation source; determining noise information corresponding to the noise signal according to the target signal; determining a spatial spectrum corresponding to the radiation source according to the noise information and a channel matrix between the signal receiving equipment and the to-be-detected vehicle; and according to the spatial spectrum, determining the position of the radiation source in the to-be-detected vehicle, so that the radiation source is automatically positioned, and the positioning precision is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a radiation source positioning method, system, device, readable storage medium and positioning equipment. Background Art

[0002] With the development of technology, the electrification level of new energy vehicles is getting higher and higher, and the experience of users using cars is getting better and better.

[0003] However, the high degree of electrification will make the circuit of the car more complicated, leading to electromagnetic compatibility problems in the car, including the problem of locating the radiation source in the car. Currently, it is difficult to locate the radiation source in the car. Summary of the invention

[0004] The embodiments of the present application provide a radiation source positioning method, system, device, readable storage medium and positioning equipment to reduce the positioning difficulty and improve the positioning accuracy, so as to at least partially solve the above-mentioned technical problems.

[0005] In order to achieve the above object, according to a first aspect of the present application, a radiation source positioning method is provided, comprising:

[0006] The signal receiving device is used to collect the signal of the radiation source of the vehicle to be tested to obtain a target signal, wherein the target signal includes a noise signal and a radiation signal of the radiation source;

[0007] Determine, according to the target signal, the noise information corresponding to the noise signal;

[0008] Determine the spatial spectrum corresponding to the radiation source according to the noise information and the channel matrix between the signal receiving device and the vehicle to be tested;

[0009] The position of the radiation source in the vehicle to be tested is determined according to the spatial spectrum.

[0010] Optionally, the channel matrix includes channel matrices for different frequency points and / or channel matrices for different polarization directions, and the determining of the spatial spectrum corresponding to the radiation source according to the noise information and the channel matrix between the signal receiving device and the vehicle to be tested includes:

[0011] Determine, according to the noise information and the channel matrix, the subspace spectra of the radiation source for different frequencies and / or for different polarization directions;

[0012] The sub-space spectra are accumulated to obtain the space spectrum corresponding to the radiation source.

[0013] Optionally, the above method further includes:

[0014] Simulating the signal transmitted by the feeding port of the signal receiving device to obtain a simulated transmission signal;

[0015] Determining the electric field distribution of the simulated transmission signal on the vehicle to be tested;

[0016] According to the electric field distribution, a channel matrix between the signal receiving device and the vehicle to be tested is determined.

[0017] Optionally, the feeding port of the signal receiving device is a feeding port of some antennas in an antenna array for collecting the target signal in the signal receiving device.

[0018] Optionally, the signal receiving device comprises a three-dimensional antenna array, which is located on a three-dimensional coordinate axis. The number of antennas on each coordinate axis of the three-dimensional antenna array is equal and the intervals between adjacent antennas are equal.

[0019] According to a second aspect of the present application, a radiation source positioning system is provided, comprising a signal receiving device and a positioning device, wherein the signal receiving device is used to collect signals from the radiation source of the vehicle to be tested to obtain a target signal, wherein the target signal comprises a noise signal and a radiation signal of the radiation source in the vehicle to be tested;

[0020] The above positioning equipment is used for:

[0021] Receiving the target signal sent by the signal receiving device;

[0022] Determine, according to the target signal, the noise information corresponding to the noise signal;

[0023] Determine the spatial spectrum corresponding to the radiation source according to the noise information and the channel matrix between the signal receiving device and the vehicle to be tested;

[0024] The position of the radiation source in the vehicle to be tested is determined according to the spatial spectrum.

[0025] Optionally, the channel matrix is ​​obtained through simulation, and the antennas for simulation are part of the antennas in the antenna array for collecting the target signal in the signal receiving device.

[0026] Optionally, the signal receiving device comprises a three-dimensional antenna array, which is located on a three-dimensional coordinate axis. The number of antennas on each coordinate axis of the three-dimensional antenna array is equal and the intervals between adjacent antennas are equal.

[0027] According to a third aspect of the present application, a radiation source positioning device is provided, comprising:

[0028] A signal acquisition module is used to acquire signals from the radiation source of the vehicle to be tested through a signal receiving device to obtain a target signal, wherein the target signal includes a noise signal and a radiation signal of the radiation source;

[0029] A first determination module, used to determine the noise information corresponding to the noise signal according to the target signal;

[0030] A second determination module is used to determine the spatial spectrum corresponding to the radiation source according to the noise information and the channel matrix between the signal receiving device and the vehicle to be tested;

[0031] The third determination module is used to determine the position of the radiation source in the vehicle to be tested according to the spatial spectrum.

[0032] In a fourth aspect, an embodiment of the present application further provides a positioning device, comprising a memory storing a plurality of instructions, and the processor loads instructions from the memory to execute any one of the radiation source positioning methods provided in the embodiments of the present application.

[0033] In a fifth aspect, an embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a plurality of instructions, and the instructions are suitable for loading by a processor to execute any radiation source positioning method provided in an embodiment of the present application.

[0034] In an embodiment of the present application, a signal receiving device is used to collect signals from the radiation source of the vehicle to be tested to obtain a target signal, wherein the target signal includes a noise signal and a radiation signal of the radiation source; noise information corresponding to the noise signal is determined according to the target signal; a spatial spectrum corresponding to the radiation source is determined according to the noise information and a channel matrix between the signal receiving device and the vehicle to be tested; a position of the radiation source in the vehicle to be tested is determined according to the spatial spectrum, and super-resolution positioning of the radiation source in the vehicle is achieved, so that not only the radiation source can be automatically positioned, but also the positioning accuracy of the radiation source can be improved.

[0035] Other features and advantages of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0037] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0038] Figure 1 is a schematic flow chart of a radiation source positioning method provided in an exemplary embodiment of the present application;

[0039] Figure 2 is a schematic diagram of a target space and a vehicle to be tested provided in an exemplary embodiment of the present application;

[0040] Figure 3 is a schematic diagram of a process of a vehicle and an antenna to be tested provided in an exemplary embodiment of the present application;

[0041] Figure 4 is another schematic diagram of a radiation source positioning method provided in an exemplary embodiment of the present application;

[0042] Figure 5 is a schematic diagram of a hollow cuboid provided in an exemplary embodiment of the present application;

[0043] Figure 6 is a schematic diagram of a dipole provided in an exemplary embodiment of the present application;

[0044] Figure 7 is a schematic diagram of an image of a spatial spectrum provided in an exemplary embodiment of the present application;

[0045] Figure 8 is another schematic diagram of an image of a spatial spectrum provided in an exemplary embodiment of the present application;

[0046] Fig. 9 is another schematic diagram of an image of a spatial spectrum provided in an exemplary embodiment of the present application;

[0047] Fig.10 is a schematic diagram of a radiation source positioning system provided in an exemplary embodiment of the present application;

[0048] Fig.11 is a schematic diagram of a radiation source positioning device provided in an exemplary embodiment of the present application;

[0049] Fig.12 is a schematic structural diagram of a positioning device provided in an exemplary embodiment of the present application;

[0050] Description of reference numerals:

[0051] Target space: 101; absorbing material: 102; vehicle to be tested: 103; area where the radiation source is located: 108; antenna array for receiving target signals: 104; antenna array for channel simulation: 109; feeder: 105; radio frequency receiving unit: 106; positioning device: 107. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with 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 of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0053] The embodiments of the present application provide a radiation source positioning method, system, device, readable storage medium and positioning device. Specifically, the radiation source positioning method of the embodiments of the present application can be executed by a positioning device, wherein the positioning device can be a terminal or a server.

[0054] The terminal may be a smart phone, a tablet computer, a laptop computer, a touch screen, a game console, a personal computer (PC), a personal digital assistant (PDA), a vehicle-mounted terminal or other terminal equipment.

[0055] The server can be an independent physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, content delivery networks (CDNs), as well as big data and artificial intelligence platforms.

[0056] An embodiment of the present application provides a method for locating a radiation source. Figure 1 FIG. 1 is a flow chart showing a radiation source positioning method provided by an exemplary embodiment of the present application. Figure 1 As shown, the radiation source positioning method includes the following steps:

[0057] S101 . Using a signal receiving device, collect signals from a radiation source of a vehicle to be tested to obtain a target signal, where the target signal includes a noise signal and a radiation signal of the radiation source.

[0058] The signal receiving device refers to a device that can be used to receive wireless signals, and its structure can be set according to actual conditions. For example, the signal receiving device can include an antenna and a radio frequency receiving unit, which is not limited in this embodiment.

[0059] Optionally, the structure of the antenna in the signal receiving device may be configured according to actual conditions. For example, the antenna in the signal receiving device may be a one-dimensional antenna or a three-dimensional antenna, which is not limited in the embodiments of the present application.

[0060] When it is necessary to locate the radiation source of the vehicle to be tested, the vehicle to be tested can be placed in a target space. The target space is a space where a signal receiving device is located, and the distance between the signal receiving device and the vehicle to be tested in the target space meets a preset distance condition.

[0061] The vehicle to be tested is placed in the target space, so that the signal receiving device is placed within the near field range of the radiation source, so that the signal receiving device can collect signals from the radiation source of the vehicle to be tested to obtain the target signal.

[0062] Alternatively, when it is necessary to locate the radiation source of the vehicle to be tested, the signal receiving device may be placed in a target space, which is a space where the vehicle to be tested is located, and the distance between the signal receiving device in the target space and the vehicle to be tested meets a preset distance condition.

[0063] The signal receiving device is placed in the target space so that the signal receiving device is placed within the near field range of the radiation source, so that the signal receiving device can collect signals from the radiation source of the vehicle to be tested to obtain the target signal.

[0064] Optionally, the target space may be a dark room, and the walls of the target space include absorbing materials to reduce the influence of external electromagnetic interference.

[0065] Since various interference signals are collected during the process of collecting the radiation signal of the radiation source, which are noise signals, the target signal obtained by collecting the signal of the radiation source of the vehicle to be tested includes the radiation signal of the radiation source and the noise signal.

[0066] In some embodiments, since the strength of signals received by antennas at different locations is different, in order to avoid affecting the positioning accuracy, the antennas can be placed around the vehicle to be tested.

[0067] In some embodiments, when the number of antennas is large, the complexity of the radiation source locating system will be too high, the channel simulation will take too long, and the practicality of the radiation source locating system will be reduced. Therefore, the antenna may include multiple sets of antennas, and part of the antenna array in the antenna array that receives the target signal can be used for channel simulation.

[0068] For example, Figure 2 As shown, 101 represents the target space, 102 represents the absorbing material, 103 represents the vehicle to be tested, 108 represents the area where the radiation source is located, that is, the area where the vehicle to be tested is located, the target signal enters the RF receiving unit 106 through the multi-antenna array 104 and the feeder 105, and the first target signal is obtained after conversion processing. The first target signal enters the positioning device 107, and the antenna array 109 is used for channel simulation.

[0069] In some embodiments, in order to better collect the target signal, the antenna in the signal receiving device can be a three-dimensional antenna array. For example, the antenna in the signal receiving device and the vehicle to be tested can be as follows: Figure 3 shown.

[0070] In some embodiments, the signal receiving device includes a three-dimensional antenna array, which is located on a three-dimensional coordinate axis. The number of antennas on each coordinate axis of the three-dimensional antenna array is equal and the intervals between adjacent antennas are equal.

[0071] Among them, the spacing between antennas in the three-dimensional antenna array is λ c / 2,λ c is the center frequency of the radiated signal. The number of antennas can be greater than the number of radiation sources.

[0072] For example, the number of antennas in the three-dimensional antenna array is 16, the number of antennas on each coordinate axis is 5, the 5 antennas are arranged at equal intervals on the coordinate axis, and the antenna at the center of the coordinate axis is multiplexed on the three coordinate axes.

[0073] In spatial spectrum imaging, the farther the position of the radiation source is from the antenna array, the weaker the field strength at the position of the radiation source, resulting in the formation of a pseudo peak. The weaker the field strength, the higher the pseudo peak formed. In order to solve this technical problem, in an embodiment of the present application, a three-dimensional antenna array is located on a three-dimensional coordinate axis, and the number of antennas in the three-dimensional antenna array on each coordinate axis is equal and the intervals between adjacent antennas are equal, thereby reducing the probability of forming a pseudo peak.

[0074] S102: Determine noise information corresponding to the noise signal according to the target signal.

[0075] The noise information refers to information that characterizes the characteristics of the noise signal. For example, the noise information may be a noise eigenvector.

[0076] The positioning device may convert the target signal to obtain a first target signal, and then determine the noise information corresponding to the noise signal based on the first target signal. Alternatively, the positioning device may directly determine the noise information corresponding to the noise signal based on the target signal.

[0077] The type of conversion processing can be set according to actual conditions. For example, the conversion processing may include at least one of amplification processing, filtering processing, down-conversion processing, and analog-to-digital conversion processing, which is not limited in the embodiments of the present application.

[0078] In some embodiments, the noise information includes a noise eigenvector, and determining the noise information corresponding to the noise signal according to the target signal includes:

[0079] Performing conversion processing on the target signal to obtain a first target signal;

[0080] determining a covariance matrix of the first target signal;

[0081] According to the covariance matrix, the noise eigenvector corresponding to the noise signal is determined.

[0082] Among them, after determining the covariance matrix of the first target signal, the terminal can perform eigenvalue decomposition on the covariance matrix to obtain Q eigenvalues, arrange the Q eigenvalues ​​in descending order to obtain D larger eigenvalues ​​and QD smaller eigenvalues, and the eigenvector obtained by solving the QD smaller eigenvalues ​​is the noise eigen.

[0083] Specifically, the relationship between the first target signal, the radiation source and the noise signal can be expressed as formula (1):

[0084] Y=AS+N (1)

[0085] Among them, Y represents the matrix of the first target signal, S is the matrix of the P×K order radiation signal, P is the number of radiation sources, K is the number of time series, Q is the number of antennas, A is the Q×P order channel matrix, and N is the Q×K order noise signal matrix.

[0086] According to formula (1), the covariance matrix of the first target signal can be obtained as:

[0087] R=E[YY H ]=AR s A H +R n (2)

[0088] Where R represents the covariance matrix of the first target signal, E represents the expected value, H represents the conjugate transpose, and R s Represents the covariance matrix of the radiation signal, R n Represents the covariance matrix of the noise signal.

[0089] Perform eigenvalue decomposition on the covariance matrix to obtain Q eigenvalues. Arrange the Q eigenvalues ​​in descending order to obtain D larger eigenvalues ​​and QD smaller eigenvalues. The eigenvector obtained by solving the QD smaller eigenvalues ​​is the noise eigenvector, that is, the noise eigenvector can be obtained by formula (3):

[0090] R i =σ 2 v i ,i=D+1,D+2,...,Q (3)

[0091] Among them, v i represents the noise eigenvector, σ 2 Represents the noise power.

[0092] Optionally, the terminal may substitute formula (2) into formula (3) and eliminate the noise terms on both sides of the equal sign to obtain:

[0093] AR s A H v i =0 (4)

[0094] By R s -1 (A H A) -1 A H ARS H v i =0 to get A H v i = 0. It can be seen that the product of the channel matrix and the noise eigenvector is zero, while the false channel matrix does not have this characteristic, so the following spatial spectrum can be constructed:

[0095] P = 1 / [a H (θ)VV H a(θ)] (5)

[0096] Wherein, P represents the spatial spectrum corresponding to the radiation source, a represents the direction vector, V represents the Q×(QD) order noise eigenvector, and θ represents the position of the radiation source.

[0097] S103: Determine a spatial spectrum corresponding to the radiation source according to the noise information and a channel matrix between the signal receiving device and the vehicle to be tested.

[0098] The channel matrix is ​​a matrix used to describe the channel characteristics during signal transmission in a communication system. It can be obtained through theoretical calculation or simulation. The channel matrix can be composed of multiple directional vectors. The spatial spectrum corresponding to the radiation source is determined based on the noise information and the channel matrix. It can also be understood as determining the spatial spectrum corresponding to the radiation source based on the noise information and the directional vector.

[0099] Specifically, after obtaining the target signal, the positioning device can determine the noise eigenvector according to formula (1), formula (2) and formula (3), and then substitute the noise eigenvector and the direction vector into formula (5) for calculation to obtain the spatial spectrum corresponding to the radiation source.

[0100] In some embodiments, after acquiring the target signal, the positioning device can determine whether the radiation of the radiation source exceeds the standard based on the target signal. If the radiation of the radiation source exceeds the standard, the channel matrix is ​​determined, and then the spatial spectrum is determined based on the noise information and the channel matrix.

[0101] For example, Figure 4As shown, a signal receiving device is set up in the target space, and the vehicle to be tested is placed in the target space. The radiation signal of the radiation source of the vehicle to be tested is collected through the signal receiving device to obtain a target signal. According to the target signal, it is determined whether the radiation of the radiation source exceeds the standard. If it exceeds the standard, the channel matrix is ​​obtained through simulation, and the spatial spectrum is determined according to the target signal and the channel matrix.

[0102] In some embodiments, in order to make the channel matrix more accurate, the channel matrix may be obtained by simulation. In this case, the embodiment further includes:

[0103] Simulating a signal transmitted from a feeding port of a signal receiving device to obtain a simulated transmission signal;

[0104] Determine the electric field distribution of the simulated transmission signal on the vehicle to be tested;

[0105] According to the electric field distribution, the channel matrix between the signal receiving device and the vehicle to be tested is determined.

[0106] In an embodiment of the present application, the signal emitted by the feeding port of the signal receiving device is simulated to obtain a simulated emission signal, and the electric field distribution of the simulated emission signal on the vehicle to be tested is determined. Based on the electric field distribution, multiple direction vectors between the signal receiving device and the vehicle to be tested are determined. The multiple direction vectors constitute a channel matrix, so that the channel matrix can be obtained through simulation, thereby improving the accuracy of the channel matrix.

[0107] In some embodiments, the feed port of the signal receiving device may be a feed port of a portion of antennas in an antenna array that collects target signals in the signal receiving device. In this embodiment, when the number of antennas is large, the complexity of the radiation source positioning system is too high, the channel simulation takes too long, and the practicality of the radiation source positioning system is reduced. Therefore, the antenna may include multiple sets of antennas, and a portion of the antenna array in the antenna array that receives the target signal is used for channel simulation.

[0108] In some embodiments, the channel matrix includes channel matrices for different frequency points and / or channel matrices for different polarization directions, and the spatial spectrum corresponding to the radiation source is determined according to the noise information and the channel matrix between the signal receiving device and the vehicle to be tested, including:

[0109] Determine the subspace spectrum of the radiation source for different frequency points and / or for different polarization directions according to the noise information and the channel matrix;

[0110] The subspace spectra are accumulated to obtain the spatial spectrum corresponding to the radiation source.

[0111] When the channel matrix includes channel matrices for different frequencies, subspace spectra for different frequencies can be calculated based on the channel matrices for different frequencies and noise information, and then the subspace spectra are incoherently accumulated to obtain the spatial spectrum. When the channel matrix includes channel matrices for different polarization directions, subspace spectra for different polarization directions can be calculated based on the channel matrices for different polarization directions, and the subspace spectra are incoherently accumulated to obtain the spatial spectrum.

[0112] When the channel matrix includes channel matrices for different frequency points and for different polarization directions, the subspace spectrum may include a first subspace spectrum and a second subspace spectrum. One channel matrix may be a channel matrix for a certain frequency point and a certain polarization direction. At this time, calculation is performed according to the channel matrix and noise information to obtain a first subspace spectrum for a certain frequency point and a certain polarization direction. Then, the first subspace spectra for the same frequency point and for different polarization directions are incoherently accumulated to obtain a second subspace spectrum for the same frequency point and different polarization directions. The second subspace spectra for different frequencies are incoherently accumulated to obtain spatial spectra for different frequencies and different polarization directions.

[0113] At this time, formula (5) is transformed into formula (6):

[0114]

[0115] Where X, Y, Z represent different polarization directions, f1, f2, ..., fn represent different frequency points. Substituting the channel matrix and the noise eigenvector into formula (6) for calculation, the spatial spectrum can be obtained.

[0116] Since the image correlation of the radiation source is high, the corresponding peak value in the spatial spectrum increases after accumulation, but the image correlation of the noise is low, and the corresponding peak value in the spatial spectrum does not change significantly after accumulation. Therefore, in an embodiment of the present application, according to the noise information and the channel matrix, the subspace spectrum of the radiation source for different frequency points and / or for different polarization directions is determined, and the subspace spectrum is accumulated to obtain the spatial spectrum corresponding to the radiation source, which can improve the signal-to-noise ratio, so that the position of the radiation source can be more easily determined.

[0117] S104: Determine the position of the radiation source in the vehicle to be tested according to the spatial spectrum.

[0118] After obtaining the spatial spectrum, the positioning device can determine the position of the radiation source in the vehicle to be tested according to the spatial spectrum.

[0119] The Multiple Signal Classification (MUSIC) algorithm has super-resolution characteristics. The algorithm uses the signal characteristics of noise rather than the physical characteristics. Therefore, the resolution is not limited to half a wavelength. It can distinguish two radiation sources with a range smaller than half a wavelength, thus achieving super-resolution imaging.

[0120] In an embodiment of the present application, a signal receiving device is used to collect signals from the radiation source of the vehicle to be tested to obtain a target signal, wherein the target signal includes a noise signal and a radiation signal of the radiation source; based on the target signal, noise information corresponding to the noise signal is determined; based on the noise information and a channel matrix between the signal receiving device and the vehicle to be tested, a spatial spectrum corresponding to the radiation source is determined; based on the spatial spectrum, a position of the radiation source in the vehicle to be tested is determined, and positioning of the radiation source in the vehicle is achieved through a multiple signal classification algorithm, so that not only can the radiation source be automatically positioned, thus shortening the positioning time of the electromagnetic compatibility problem of the entire vehicle, but also the positioning accuracy of the radiation source can be improved.

[0121] The following is an explanation of the positioning effect of the radiation source positioning method of this embodiment. In the process of evaluating the positioning effect, for the sake of simplicity, the vehicle to be tested is simplified into a hollow cuboid. The hollow cuboid can be as follows: Figure 5 The various parameters can be shown in the following table:

[0122]

[0123] The antenna in the antenna array can be a dipole, and the structure of the dipole can be as follows Figure 6 The parameters of the dipole are shown in the following table:

[0124]

[0125] The radiation source is located near the hollow cuboid. The center frequency of the simulation signal is fc = 1 GHz, the bandwidth is 20 MHz, and a frequency point is selected every 5 MHz for incoherent accumulation, namely 1990 MHz, 1995 MHz, 2000 MHz, 2005 MHz and 2010 MHz. The number of antennas in the receiving signal device is 16, which are arranged at equal intervals on three coordinate axes, with 6 antennas on each coordinate axis. The antennas at the center are multiplexed on the three coordinate axes, and the interval between the antennas is 15 cm (λ c / 2), the area where the hollow cuboid is located is 2.4m×5m×1.5m, the scanning points in the area are 49×101×31, and multiple radiation sources are placed in the area where the hollow cuboid is located. After using CST simulation to excite the signal source, the target signal can be collected by the signal receiving device.

[0126] Then the channel matrix is ​​obtained through simulation. Using the multiple signal classification algorithm, according to the channel matrix and the target signal, the subspace spectrum for different frequency points and different polarization directions is determined, and the subspace spectrum is incoherently accumulated to obtain the spatial spectrum.

[0127] When the number of radiation sources is 1 and the position of the radiation source is (2m, 4.9m, 1m), the spatial spectrum is represented in the form of an image, and the top view of the image is as follows: Figure 7 As shown in 701, the side view of the obtained image is as follows Figure 7 As shown in 702, Figure 7 The location of the highest peak is the location of the radiation source. Figure 7 The peaks in the middle and upper parts (3m, 5.6m, 1.75m) are pseudo peaks.

[0128] When the number of radiation sources is two, the spatial spectrum is represented in the form of an image, and the top view of the image is as follows: Figure 8 As shown in 801, the side view of the obtained image is as follows Figure 8 As shown in 802, from Figure 8 It can be seen that both radiation sources can be imaged clearly and can be well distinguished.

[0129] When the number of radiation sources is 3 and the interval between two radiation sources is 0.1 m, the spatial spectrum is represented in the form of an image, and the top view of the image is as follows: Fig. 9 As shown in 901, the side view of the obtained image is as follows Fig. 9 As shown in 902, from Fig. 9 It can be seen that radiation sources with an interval less than half a wavelength can also be clearly imaged and the positions of the two radiation sources can also be determined, while in the related art, radiation sources with an interval less than half a wavelength cannot be distinguished.

[0130] As can be seen from the above, in the embodiment of the present application, a signal receiving device is used to collect signals from the radiation source of the vehicle to be tested to obtain a target signal, wherein the target signal includes a noise signal and a radiation signal of the radiation source; according to the target signal, noise information corresponding to the noise signal is determined; according to the noise information and a channel matrix between the signal receiving device and the vehicle to be tested, a spatial spectrum corresponding to the radiation source is determined; according to the spatial spectrum, the position of the radiation source in the vehicle to be tested is determined, and super-resolution positioning of the radiation source in the vehicle is achieved, so that not only the radiation source can be automatically positioned, but also the positioning accuracy of the radiation source can be improved.

[0131] The present application provides a radiation source positioning system, the radiation source positioning system is as follows Fig.10As shown, it includes a signal receiving device and a positioning device. The signal receiving device is used to collect signals from the radiation source of the vehicle to be tested to obtain a target signal. The target signal includes a noise signal and a radiation signal of the radiation source in the vehicle to be tested. The positioning device receives the target signal sent by the signal receiving device, determines noise information corresponding to the noise signal according to the target signal, determines a spatial spectrum corresponding to the radiation source according to the noise information and a channel matrix between the signal receiving device and the vehicle to be tested, and determines the position of the radiation source in the vehicle to be tested according to the spatial spectrum.

[0132] In some embodiments, the channel matrix is ​​obtained by simulation, and the antennas to be simulated are part of the antenna arrays in the signal receiving device that collect the target signal. The antenna to be simulated is also the antenna where the feeding port is located, and the signal transmitted by the feeding port is simulated to obtain a simulated transmission signal, and the electric field distribution of the simulated transmission signal on the vehicle to be tested is determined; based on the electric field distribution, the channel matrix between the signal receiving device and the vehicle to be tested is determined.

[0133] In some embodiments, the signal receiving device includes a three-dimensional antenna array, which is located on a three-dimensional coordinate axis. The number of antennas on each coordinate axis of the three-dimensional antenna array is equal and the intervals between adjacent antennas are equal.

[0134] In this embodiment, the radiation source positioning system includes a signal receiving device and a positioning device. The signal receiving device is used to collect signals from the radiation source of the vehicle to be tested to obtain a target signal. The target signal includes a noise signal and a radiation signal of the radiation source in the vehicle to be tested. The positioning device receives the target signal sent by the signal receiving device, and determines the noise information corresponding to the noise signal according to the target signal. The spatial spectrum corresponding to the radiation source is determined according to the noise information and a channel matrix between the signal receiving device and the vehicle to be tested. The position of the radiation source in the vehicle to be tested is determined according to the spatial spectrum, and the position of the radiation source in the vehicle to be tested is determined by the radiation source positioning system, so that not only the position of the radiation source can be automatically determined, but also the positioning accuracy of the radiation source can be improved.

[0135] The specific implementation method and corresponding beneficial effects of this embodiment can be specifically referred to in the above method embodiment, and this embodiment will not be described in detail here.

[0136] In order to better implement the radiation source positioning method provided in the embodiment of the present application, the embodiment of the present application also provides a device based on the above radiation source positioning method. The meanings of the terms are the same as those in the above radiation source positioning method, and the specific implementation details can refer to the description in the method embodiment.

[0137] For example, Fig.11 As shown, the radiation source positioning device may include:

[0138] The signal acquisition module 1101 is used to acquire the signal of the radiation source of the vehicle to be tested through a signal receiving device to obtain a target signal, wherein the target signal includes a noise signal and a radiation signal of the radiation source;

[0139] The first determining module 1102 is configured to determine noise information corresponding to the noise signal according to the target signal.

[0140] The second determination module 1103 is used to determine the spatial spectrum corresponding to the radiation source according to the noise information and the channel matrix between the signal receiving device and the vehicle to be tested.

[0141] The third determination module 1104 is used to determine the position of the radiation source in the vehicle to be tested according to the spatial spectrum.

[0142] In some embodiments, the channel matrix includes channel matrices for different frequency points and / or channel matrices for different polarization directions, and the second determination module 1103 is specifically used to execute:

[0143] Determine the subspace spectrum of the radiation source for different frequency points and / or for different polarization directions according to the noise information and the channel matrix;

[0144] The subspace spectra are accumulated to obtain the spatial spectrum corresponding to the radiation source.

[0145] In some embodiments, the noise information includes a noise eigenvector, and the first determination module 1102 is specifically configured to execute:

[0146] Performing conversion processing on the target signal to obtain a first target signal;

[0147] determining a covariance matrix of the first target signal;

[0148] According to the covariance matrix, the noise eigenvector corresponding to the noise signal is determined.

[0149] In some embodiments, the second determining module 1103 is further configured to execute:

[0150] Simulating a signal transmitted from a feeding port of a signal receiving device to obtain a simulated transmission signal;

[0151] Determine the electric field distribution of the simulated transmission signal on the vehicle to be tested;

[0152] According to the electric field distribution, the channel matrix between the signal receiving device and the vehicle to be tested is determined.

[0153] In some embodiments, the second determining module 1103 is further configured to execute:

[0154] Simulating a signal transmitted from a feeding port of a signal receiving device to obtain a simulated transmission signal;

[0155] Determine the electric field distribution of the simulated transmission signal on the vehicle to be tested;

[0156] According to the electric field distribution, the channel matrix between the signal receiving device and the vehicle to be tested is determined.

[0157] In some embodiments, the feeding port of the signal receiving device is a feeding port of a part of antennas in an antenna array for collecting target signals in the signal receiving device.

[0158] In some embodiments, the signal receiving device includes a three-dimensional antenna array, which is located on a three-dimensional coordinate axis. The number of antennas on each coordinate axis of the three-dimensional antenna array is equal and the intervals between adjacent antennas are equal.

[0159] In specific implementation, the above modules can be implemented as independent entities, or can be arbitrarily combined and implemented as the same or several entities. The specific implementation methods and corresponding beneficial effects of the above modules can be found in the previous method embodiments, which will not be repeated here.

[0160] Accordingly, the embodiment of the present application also provides a positioning device, which can be a terminal, and the terminal can be a smart phone, a tablet computer, a laptop computer, a touch screen, a game console, a personal computer (PC, Personal Computer), a personal digital assistant (Personal Digital Assistant, PDA) and other terminal devices. Fig.12 As shown, Fig.12 A schematic diagram of the structure of a positioning device provided in an embodiment of the present application. The positioning device 1200 includes a processor 1201 having one or more processing cores, a memory 1202 having one or more computer-readable storage media, and a computer program stored in the memory 1202 and executable on the processor. The processor 1201 is electrically connected to the memory 1202. It will be understood by those skilled in the art that the positioning device structure shown in the figure does not constitute a limitation on the positioning device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0161] The processor 1201 is the control center of the positioning device 1200. It uses various interfaces and lines to connect the various parts of the entire positioning device 1200, and executes various functions of the positioning device 1200 and processes data by running or loading software programs and / or modules stored in the memory 1202, and calling data stored in the memory 1202, thereby monitoring the positioning device 1200 as a whole.

[0162] In the embodiment of the present application, the processor 1201 in the positioning device 1200 will load instructions corresponding to the processes of one or more applications into the memory 1202 according to the following steps, and the processor 1201 will run the application stored in the memory 1202 to implement various functions, such as:

[0163] The signal receiving device is used to collect the signal of the radiation source of the vehicle to be tested to obtain the target signal, which includes the noise signal and the radiation signal of the radiation source;

[0164] Determine noise information corresponding to the noise signal according to the target signal;

[0165] Determine the spatial spectrum corresponding to the radiation source according to the noise information and the channel matrix between the signal receiving device and the vehicle to be tested;

[0166] Based on the spatial spectrum, the location of the radiation source in the vehicle under test is determined.

[0167] The specific implementation methods and corresponding beneficial effects of the above operations can be found in the detailed description of the radiation source positioning method above, which will not be elaborated here.

[0168] Optional, such as Fig.12 As shown, the positioning device 1200 also includes: a touch screen 1203, a radio frequency circuit 1204, an audio circuit 1205, an input unit 1206 and a power supply 1207. Among them, the processor 1201 is electrically connected to the touch screen 1203, the radio frequency circuit 1204, the audio circuit 1205, the input unit 1206 and the power supply 1207 respectively. Those skilled in the art can understand that Fig.12 The positioning device structure shown in the figure does not constitute a limitation on the positioning device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0169] The touch display screen 1203 can be used to display a graphical user interface and receive operation instructions generated by the user acting on the graphical user interface. The touch display screen 1203 may include a display panel and a touch panel. Among them, the display panel may be used to display information input by the user or information provided to the user and various graphical user interfaces of the positioning device, and these graphical user interfaces may be composed of graphics, text, icons, videos and any combination thereof. Optionally, the display panel may be configured in the form of a liquid crystal display (LCD, Liquid Crystal Display), an organic light-emitting diode (OLED, Organic Light-Emitting Diode) and the like. The touch panel may be used to collect the user's touch operation on or near it (such as the user using any suitable object or attachment such as a finger, a stylus, etc. on the touch panel or near the touch panel), and generate corresponding operation instructions, and the operation instructions execute corresponding programs. Optionally, the touch panel may include two parts: a touch detection device and a touch controller. Among them, the touch detection device detects the user's touch orientation, detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into the touch point coordinates, and then sends it to the processor 1201, and can receive the command sent by the processor 1201 and execute it. The touch panel can cover the display panel. When the touch panel detects a touch operation on or near it, it is transmitted to the processor 1201 to determine the type of touch event, and then the processor 1201 provides a corresponding visual output on the display panel according to the type of touch event. In an embodiment of the present application, the touch panel and the display panel can be integrated into the touch display screen 1203 to realize the input and output functions. However, in some embodiments, the touch panel and the touch panel can be used as two independent components to realize the input and output functions. That is, the touch display screen 1203 can also be used as a part of the input unit 1206 to realize the input function.

[0170] The radio frequency circuit 1204 may be used to send and receive radio frequency signals, so as to establish wireless communication with a network device or other positioning devices through wireless communication, and to send and receive signals between the network device or other positioning devices.

[0171] The audio circuit 1205 can be used to provide an audio interface between the user and the positioning device through a speaker and a microphone. The audio circuit 1205 can transmit the electrical signal converted from the received audio data to the speaker, which is converted into a sound signal for output; on the other hand, the microphone converts the collected sound signal into an electrical signal, which is received by the audio circuit 1205 and converted into audio data, and then the audio data is output to the processor 1201 for processing, and then sent to another positioning device through the radio frequency circuit 1204, or the audio data is output to the memory 1202 for further processing. The audio circuit 1205 may also include an earplug jack to provide communication between an external headset and the positioning device.

[0172] The input unit 1206 may be used to receive input numbers, character information or user feature information (such as fingerprint, iris, facial information, etc.), and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.

[0173] The power supply 1207 is used to supply power to various components of the positioning device 1200. Optionally, the power supply 1207 can be logically connected to the processor 1201 through a power management system, so that the power management system can manage charging, discharging, and power consumption. The power supply 1207 can also include one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

[0174] although Fig.12 Not shown, the positioning device 1200 may also include a camera, a sensor, a wireless fidelity module, a Bluetooth module, etc., which will not be described in detail here.

[0175] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0176] A person of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be completed by instructions, or by controlling related hardware through instructions. The instructions may be stored in a computer-readable storage medium and loaded and executed by a processor.

[0177] To this end, an embodiment of the present application provides a computer-readable storage medium, in which multiple computer programs are stored, and the computer program can be loaded by a processor to execute any radiation source positioning method provided in the embodiment of the present application. For example, the computer program can execute the following steps:

[0178] The signal receiving device is used to collect the signal of the radiation source of the vehicle to be tested to obtain the target signal, which includes the noise signal and the radiation signal of the radiation source;

[0179] Determine noise information corresponding to the noise signal according to the target signal;

[0180] Determine the spatial spectrum corresponding to the radiation source according to the noise information and the channel matrix between the signal receiving device and the vehicle to be tested;

[0181] Based on the spatial spectrum, the location of the radiation source in the vehicle under test is determined.

[0182] The specific implementation methods and corresponding beneficial effects of the above operations can be found in the detailed description of the radiation source positioning method above, which will not be elaborated here.

[0183] The computer-readable storage medium may include: a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0184] Since the computer program stored in the computer-readable storage medium can execute any one of the radiation source positioning methods provided in the embodiments of the present application, the beneficial effects that can be achieved by any one of the radiation source positioning methods provided in the embodiments of the present application can be achieved. Please refer to the previous embodiments for details and will not be repeated here.

[0185] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0186] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0187] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0188] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. Although the descriptions of various embodiments in the embodiments of the present application have different focuses, for parts not described in detail in a certain embodiment, reference can be made to the relevant embodiments of other embodiments. However, any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A radiation source positioning method, characterized in that: include: By means of a signal receiving device, a signal is collected from a radiation source of the vehicle to be tested to obtain a target signal, wherein the target signal includes a noise signal and a radiation signal of the radiation source; Determining noise information corresponding to the noise signal according to the target signal; Determining a spatial spectrum corresponding to the radiation source according to the noise information and a channel matrix between the signal receiving device and the vehicle to be tested; The position of the radiation source in the vehicle to be tested is determined according to the spatial spectrum.

2. The radiation source positioning method according to claim 1, characterized in that: The channel matrix includes channel matrices for different frequency points and / or channel matrices for different polarization directions, and determining the spatial spectrum corresponding to the radiation source according to the noise information and the channel matrix between the signal receiving device and the vehicle to be tested includes: Determining, according to the noise information and the channel matrix, subspace spectra of the radiation source for different frequency points and / or for different polarization directions; The sub-space spectra are accumulated to obtain a spatial spectrum corresponding to the radiation source.

3. The radiation source positioning method according to claim 1, characterized in that: The noise information includes a noise eigenvector, and determining the noise information corresponding to the noise signal according to the target signal includes: Performing conversion processing on the target signal to obtain a first target signal; Determining a covariance matrix of the first target signal; A noise eigenvector corresponding to the noise signal is determined according to the covariance matrix.

4. The radiation source positioning method according to claim 1, characterized in that: The method further comprises: Simulating a signal transmitted from a feeding port of the signal receiving device to obtain a simulated transmission signal; Determining the electric field distribution of the simulated transmission signal on the vehicle to be tested; A channel matrix between the signal receiving device and the vehicle to be tested is determined according to the electric field distribution.

5. The radiation source positioning method according to claim 4, characterized in that: The feeding port of the signal receiving device is a feeding port of a part of antennas in an antenna array in the signal receiving device that collects the target signal.

6. The radiation source positioning method according to any one of claims 1 to 5, characterized in that: The signal receiving device comprises a three-dimensional antenna array, which is located on a three-dimensional coordinate axis. The number of antennas on each coordinate axis of the three-dimensional antenna array is equal and the intervals between adjacent antennas are equal.

7. A radiation source positioning system, characterized in that: It includes a signal receiving device and a positioning device, wherein the signal receiving device is used to collect signals from the radiation source of the vehicle to be tested to obtain a target signal, wherein the target signal includes a noise signal and a radiation signal of the radiation source in the vehicle to be tested; The positioning device is used for: receiving the target signal sent by the signal receiving device; Determining noise information corresponding to the noise signal according to the target signal; Determining a spatial spectrum corresponding to the radiation source according to the noise information and a channel matrix between the signal receiving device and the vehicle to be tested; The position of the radiation source in the vehicle to be tested is determined according to the spatial spectrum.

8. The radiation source positioning system according to claim 7, characterized in that: The channel matrix is ​​obtained through simulation, and the antennas for simulation are part of the antennas in the antenna array for collecting the target signal in the signal receiving device.

9. The radiation source positioning system according to claim 7, characterized in that: The signal receiving device comprises a three-dimensional antenna array, which is located on a three-dimensional coordinate axis. The number of antennas on each coordinate axis of the three-dimensional antenna array is equal and the intervals between adjacent antennas are equal.

10. A radiation source positioning device, characterized in that: include: A signal acquisition module is used to acquire signals from the radiation source of the vehicle to be tested through a signal receiving device to obtain a target signal, wherein the target signal includes a noise signal and a radiation signal of the radiation source; A first determining module, configured to determine noise information corresponding to the noise signal according to the target signal; A second determination module is used to determine the spatial spectrum corresponding to the radiation source according to the noise information and the channel matrix between the signal receiving device and the vehicle to be tested; The third determination module is used to determine the position of the radiation source in the vehicle to be tested according to the spatial spectrum.

11. A positioning device, characterized in that: The method comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the radiation source positioning method according to any one of claims 1 to 6 when executing the computer program.

12. A computer-readable storage medium storing a plurality of instructions, wherein the instructions are suitable for being loaded by a processor to execute the radiation source positioning method according to any one of claims 1 to 6.

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