Angle of arrival measurement method, electronic device, readable storage medium and chip

Abstract

The application provides an angle of arrival measurement method, an electronic device, a readable storage medium and a chip, and relates to the technical field of wireless positioning. The method is applied to an electronic device, and the electronic device comprises a first antenna and a second antenna. The antenna radiation field patterns of the first antenna and the second antenna are similar within a first angle range around the electronic device and are not similar within a second angle range around the electronic device. The method comprises the following steps: determining the difference between target parameters measured by the first antenna and the second antenna according to a wireless signal; determining the angle of arrival range of the wireless signal according to the difference; wherein the angle of arrival range is the first angle range or the second angle range; and measuring the angle of arrival of the wireless signal by using the first antenna and the second antenna according to the angle of arrival range. The technical scheme provided in the embodiment can improve the accuracy of angle of arrival measurement.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wireless positioning technology, and in particular to an angle of arrival measurement method, an electronic device, a readable storage medium and a chip. BACKGROUND

[0002] An electronic device can determine the direction of a signal source of a wireless signal relative to the electronic device according to an angle of arrival (AoA) of the wireless signal, so as to realize device positioning. At present, the electronic device usually determines the angle of arrival of the wireless signal according to the phase difference of the wireless signal received by different antennas. However, for two wireless signals respectively symmetrically incident from the front and back of the electronic device, that is, two wireless signals with angles of arrival of θ and -θ, the phase difference is the same. Therefore, when determining the angle of arrival of the wireless signal according to the phase difference, the electronic device usually cannot distinguish whether the wireless signal comes from the front or the back of the device, resulting in a large error in the measurement result. SUMMARY

[0003] The present application provides an angle of arrival measurement method, an electronic device, a readable storage medium and a chip, which are used to solve the problem of large angle of arrival measurement error in the prior art.

[0004] To achieve the above object, the present application adopts the following technical solutions:

[0005] In a first aspect, an angle of arrival measurement method is provided, which is applied to an electronic device, and the electronic device includes a first antenna and a second antenna. The antenna radiation field patterns of the first antenna and the second antenna are similar in a first angle range around the electronic device and are not similar in a second angle range around the electronic device. The method includes: determining a difference in a target parameter measured by the first antenna and the second antenna according to a wireless signal; determining an angle of arrival range of the wireless signal according to the difference; wherein the angle of arrival range is the first angle range or the second angle range; and measuring the angle of arrival of the wireless signal using the first antenna and the second antenna according to the angle of arrival range.

[0006] In this embodiment, the electronic device first identifies the angle of arrival range of the wireless signal based on the field pattern difference of the first antenna and the second antenna in different angle ranges according to the measurement difference of the target parameter by the first antenna and the second antenna, and then performs angle of arrival measurement in the angle of arrival range, thereby improving the angle of arrival measurement accuracy.

[0007] In some embodiments, determining the angle of arrival range of the wireless signal according to the difference includes: when the difference is less than or equal to a threshold value, determining that the angle of arrival range of the wireless signal is the first angle range; and when the difference is greater than the threshold value, determining that the angle of arrival range of the wireless signal is the second angle range.

[0008] In some embodiments, the first angle range corresponds to a back side of the electronic device, and the second angle range corresponds to a front side of the electronic device; or, the first angle range corresponds to the front side of the electronic device, and the second angle range corresponds to the back side of the electronic device; wherein the front side is a side where a screen of the electronic device faces, and the back side is a side where a back cover of the electronic device faces; or, the front side is a region where a top of the screen of the electronic device faces, and the back side is a region where a bottom of the screen of the electronic device faces. By this method, the electronic device can improve the measurement accuracy of the angle of arrival of the front side and the back side of the electronic device.

[0009] In some embodiments, the target parameter is a distance from a signal source to the electronic device, and the signal source is configured to emit the wireless signal; or, the target parameter is a power of the received wireless signal. It should be noted that the target parameter is a parameter affected by the antenna radiation patterns of the first antenna and the second antenna.

[0010] In some embodiments, determining the difference of the target parameter measured by the first antenna and the second antenna according to the wireless signal includes: determining, by using the first antenna, a first measurement result of the target parameter according to the wireless signal; determining, by using the second antenna, a second measurement result of the target parameter according to the wireless signal; and determining an absolute value of a difference between the first measurement result and the second measurement result as the difference of the target parameter measured by the first antenna and the second antenna.

[0011] In this embodiment, the difference between the measurements of the target parameter by the first antenna and the second antenna reflects the difference between the antenna radiation patterns of the first antenna and the second antenna on the propagation path of the wireless signal, so as to determine the angle of arrival range of the wireless signal.

[0012] In some embodiments, the second antenna is a common-body antenna, and the common-body antenna includes a differential mode (DM) antenna and a common mode (CM) antenna; accordingly, determining the difference of the target parameter measured by the first antenna and the second antenna according to the wireless signal includes: determining a first difference of the target parameter measured by the first antenna and the DM antenna according to the wireless signal; determining a second difference of the target parameter measured by the second antenna and the CM antenna according to the wireless signal; and determining the difference of the target parameter measured by the first antenna and the second antenna according to the first difference and the second difference.

[0013] In this embodiment, based on the complementary characteristics of the antenna radiation patterns of the DM antenna and the CM antenna, the electronic device determines the angle of arrival range of the wireless signal according to the difference between the measurements of the target parameter by the first antenna and the DM antenna, and the difference between the measurements of the target parameter by the first antenna and the CM antenna, so as to improve the accuracy of the angle of arrival range.

[0014] In some embodiments, according to the first difference value and the second difference value, determining the measurement difference of the target parameter of the first antenna and the second antenna includes: determining the maximum value of the first difference value and the second difference value as the difference value of the target parameter measured by the first antenna and the second antenna according to the wireless signal; or determining the average value of the first difference value and the second difference value as the difference value of the target parameter measured by the first antenna and the second antenna according to the wireless signal.

[0015] In some embodiments, the first antenna is a frame antenna, and the second antenna is a patch antenna. The antenna radiator of the frame antenna is a metal frame of the mobile phone, which is easy to set as an omnidirectional antenna. The antenna radiator of the patch antenna is a metal patch, which is easy to set as a directional antenna. The antenna radiation field type between the omnidirectional antenna and the directional antenna is easy to meet the characteristics that they are similar in the first angle range and are not similar in the second angle range, thereby assisting in realizing the method for measuring the angle of arrival provided in the embodiments.

[0016] In some embodiments, according to the angle of arrival range, using the first antenna and the second antenna to measure the angle of arrival of the wireless signal includes: in the process of rotating the electronic device, determining the correlation between the measured value of the phase difference of the wireless signal at different times and the true value of the phase difference at different angles of arrival in the angle of arrival range; performing fusion processing on the correlations at the different times to obtain a fused correlation; and determining the angle of arrival of the wireless signal according to the fused correlation.

[0017] Through the method provided in the embodiments of the present application, the electronic device can further improve the accuracy of the angle of arrival measurement by the method of rotating the mobile phone to assist in angle measurement.

[0018] In some embodiments, according to the fused correlation, determining the angle of arrival of the wireless signal includes: determining the maximum value in the fused correlation; and determining the angle of arrival corresponding to the maximum value as the angle of arrival of the wireless signal.

[0019] In some embodiments, the sum of the first angle range and the second angle range covers 360 degrees around the electronic device.

[0020] In a second aspect, the embodiments of the present application provide an electronic device, which includes a first antenna and a second antenna; the antenna radiation field patterns of the first antenna and the second antenna are similar in a first angle range around the electronic device and are not similar in a second angle range around the electronic device; and the electronic device is configured to perform the method shown in the first aspect.

[0021] In a third aspect, the embodiments of the present application provide a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the method shown in the first aspect.

[0022] In a fourth aspect, an embodiment of the present application provides a chip, comprising a processor and a memory, wherein the memory stores a computer program, and the computer program is executed by the processor to implement the method shown in the first aspect.

[0023] In a fifth aspect, an embodiment of the present application provides a computer program product, wherein the computer program product stores a computer program, and the computer program is run by an electronic device to enable the electronic device to execute the method shown in the first aspect.

[0024] It can be understood that the beneficial effects of the second aspect to the fifth aspect can be referred to the related description in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 FIG. 1 is a schematic diagram of an angle of arrival measurement system provided by an embodiment of the present application;

[0026] Figure 2A FIG. 2 is a schematic diagram of an angle of arrival measurement posture provided by an embodiment of the present application;

[0027] Figure 2B FIG. 3 is a front and back schematic diagram of a measurement device provided by an embodiment of the present application;

[0028] Figure 3 FIG. 4 is a schematic diagram of an angle of arrival measurement posture provided by another embodiment of the present application;

[0029] Figure 4 FIG. 5 is a schematic diagram of an angle of arrival provided by an embodiment of the present application;

[0030] Figure 5 FIG. 6 is a schematic diagram of an angle of arrival measurement principle provided by an embodiment of the present application;

[0031] Figure 6 FIG. 7 is a schematic diagram of a cosine function provided by an embodiment of the present application;

[0032] Figure 7A FIG. 8 is a structural schematic diagram of a measurement device suitable for an angle of arrival measurement method provided by an embodiment of the present application;

[0033] Figure 7B FIG. 9 is a structural schematic diagram of a measurement device suitable for an angle of arrival measurement method provided by another embodiment of the present application;

[0034] Figure 8 FIG. 10 is an antenna radiation pattern of a first antenna and a second antenna provided by an embodiment of the present application;

[0035] Figure 9 FIG. 11 is a three-dimensional antenna radiation pattern of a first antenna and a second antenna provided by an embodiment of the present application; FIG. 12 is a schematic diagram of an angle of arrival measurement system provided by an embodiment of the present application;

[0036] Figure 10 is a ranging difference diagram of the first antenna and the second antenna provided by an embodiment of the present application;

[0037] Figure 11 is a schematic flow chart of an angle of arrival measurement method provided by an embodiment of the present application;

[0038] Figure 12 is an antenna radiation pattern of the DM antenna and the CM antenna provided by an embodiment of the present application;

[0039] Figure 13A is a ranging difference diagram of the first antenna and the DM / CM antenna provided by an embodiment of the present application;

[0040] Figure 13B is a ranging difference diagram after fusion processing provided by an embodiment of the present application;

[0041] Figure 14 is a ranging difference diagram of the first antenna and the second antenna provided by an embodiment of the present application;

[0042] Figure 15 is a correlation diagram of the phase difference provided by an embodiment of the present application;

[0043] Figure 16 is a measurement process diagram of the angle of arrival provided by an embodiment of the present application;

[0044] Figure 17 is a correlation diagram of the phase difference provided by an embodiment of the present application;

[0045] Figure 18 is a measurement process diagram of the angle of arrival provided by another embodiment of the present application;

[0046] Figure 19 is a display interface diagram of a measurement device provided by an embodiment of the present application;

[0047] Figure 20 is a correlation diagram of the phase difference provided by another embodiment of the present application;

[0048] Figure 21 is a schematic flow chart of an angle of arrival measurement method provided by other embodiments of the present application;

[0049] Figure 22 is a display interface diagram of a measurement device provided by another embodiment of the present application;

[0050] Figure 23 is a correlation diagram of the phase difference provided by yet another embodiment of the present application;

[0051] Figure 24is a display interface schematic diagram of a measurement device provided by another embodiment of the application;

[0052] Figure 25 is an angle of arrival measurement error schematic diagram provided by an embodiment of the application.

[0053] Figure 26 is a chip structure schematic diagram provided by an embodiment of the application. DETAILED DESCRIPTION

[0054] It should be understood that, in the description of the embodiments of the application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B; "and / or" in this document is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist together, and B exists alone.

[0055] In this embodiment, the terms "first", "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments, unless otherwise specified, the meaning of "multiple" is two or more.

[0056] The technical solutions provided by the embodiments of the application will be described below with reference to the drawings.

[0057] The angle of arrival (AoA) is a key parameter in wireless positioning technology, which is used to represent the included angle between the direction of arrival of a wireless signal and the straight line where the angle of arrival measurement antenna (hereinafter referred to as antenna) is located. Through the angle of arrival measurement technology, the electronic device can locate the signal source device that transmits the wireless signal, or combine the position information of the signal source device to perform reverse positioning on the electronic device. The angle of arrival measurement technology has a wide range of applications in the field of wireless positioning technology.

[0058] Figure 1 is a schematic diagram of an angle of arrival measurement system provided by an embodiment of the application. Referring to Figure 1 As shown, the angle of arrival measurement system includes a measurement device and a signal source device, wherein the measurement device and the signal source device are connected through wireless communication technology.

[0059] In this embodiment, the electronic devices such as the measurement device and the source device can be a mobile phone, a tablet computer (Pad), a smart home device (such as a smart television, a smart speaker, a sweeping robot, a smart air conditioner, etc.) with wireless transceiver function, a computer with wireless transceiver function, a smart television, a projector, a wearable device (such as a smart watch), a vehicle-mounted device, an augmented reality (AR) / virtual reality (VR) device, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), a router, etc. The specific type of the measurement device and the source device is not limited in the embodiments of the present application.

[0060] In addition, the wireless communication technology can be wireless fidelity (Wi-Fi), conventional Bluetooth (BT), Bluetooth low energy (BLE), ultra wide band (UWB), or radio frequency (RF) communication technology, etc. The embodiments of the present application do not limit this.

[0061] The source device is configured to transmit a wireless signal required for angle of arrival measurement during the angle of arrival measurement process. The wireless signal can be a measurement frame, a beacon frame, etc. Optionally, the source device can transmit the wireless signal autonomously, or can transmit the wireless signal according to the indication of the measurement device. The wireless signal can be a WiFi signal, a Bluetooth signal, a UWB signal, or an FR signal, etc. The embodiments of the present application do not limit this.

[0062] The measurement device is configured to receive the wireless signal transmitted by the source device through at least two antennas, and determine the angle of arrival of the wireless signal according to the phase difference Δφ of the wireless signal received by the at least two antennas. For example, the measurement device can calculate the angle of arrival of the wireless signal by using an angle of arrival calculation formula, or can determine the angle of arrival of the wireless signal according to the mapping relationship between the phase difference and the angle of arrival. The embodiments of the present application do not limit this.

[0063] It should be noted that the antenna in this embodiment refers to an antenna used for performing the angle of arrival measurement. It should be understood that although this embodiment does not show, the measurement device can include other antennas in addition to the above-mentioned antenna used for performing the angle of arrival measurement, such as an antenna for receiving satellite positioning signals, an antenna for receiving cellular signals, and the like. In addition, the working frequency band of the antenna is not limited in the embodiments of the present application, for example, it can be a Wi-Fi frequency band of 2.4 GHz / 5 GHz, a Bluetooth frequency band of 2.4 GHz, or a UWB frequency band of 3.1-10.6 GHz, a new radio (NR) frequency band, and the like.

[0064] In the angle of arrival measurement process, the measurement device usually needs to maintain a preset posture. This is exemplarily illustrated below.

[0065] Figure 2A is a schematic diagram of an angle of arrival measurement posture provided by an embodiment of the present application. Referring to Figure 2A , in the angle of arrival measurement process, on the one hand, the measurement device is basically kept vertical, that is, the screen of the measurement device is basically perpendicular to the horizontal plane; the straight line where the antenna 1 and the antenna 2 used for performing the angle of arrival measurement in the measurement device are basically kept horizontal. Based on this, the antenna 1 and the antenna 2 can measure the angle of arrival of the wireless signal from the front of the measurement device, and can also measure the angle of arrival of the wireless signal from the back of the measurement device.

[0066] It should be noted that in this angle of arrival measurement posture, referring to Figure 2B , the front of the measurement device refers to the direction towards which the display screen of the measurement device faces, which displays a picture related to the angle of arrival measurement, such as an indication arrow of the direction of arrival, information such as the distance between the signal source device and the measurement device. The back of the measurement device refers to the side towards which the back cover of the measurement device faces, and the back of the measurement device is arranged opposite to the front. It can be understood that in the angle of arrival measurement process, the front of the measurement device usually faces the user, and the back of the measurement device usually faces away from the user.

[0067] Figure 3 is a schematic diagram of an angle of arrival measurement posture provided by another embodiment of the present application. Referring to Figure 3 , in the angle of arrival measurement process, the measurement device is basically kept horizontal, that is, the screen of the measurement device is basically parallel to the horizontal plane; in addition, the straight line where the antenna 1 and the antenna 2 used for performing the angle of arrival measurement in the measurement device are also basically kept horizontal. Based on this, the antenna 1 and the antenna 2 can measure the angle of arrival of the wireless signal from the front of the measurement device, and can also measure the angle of arrival of the wireless signal from the back of the measurement device.

[0068] It should be noted that in this angle of arrival measurement posture, referring to Figure 3As shown, the front of the measuring device refers to the area facing the top of the measuring device screen; the back of the measuring device refers to the area facing the bottom of the measuring device screen.

[0069] For ease of description, see Figure 4 As shown, in this embodiment, θ represents the angle of arrival of the wireless signal from the back of the measuring device, and -θ represents the angle of arrival of the wireless signal from the front of the measuring device. In other words, the angle of arrival of the wireless signal from the back of the measuring device is a positive value, and the angle of arrival of the wireless signal from the front of the measuring device is a negative value. For example, the angle range corresponding to the front of the measuring device is -180° to 0°, and the angle range corresponding to the back of the measuring device is 0° to 180°. Of course, the angle ranges corresponding to the front and back of the measuring device can also be other values, and this embodiment does not limit them.

[0070] Figure 5 This is a schematic diagram illustrating the angle of arrival measurement principle according to one embodiment of this application. See also... Figure 5 As shown, taking the measurement device using antenna 1 and antenna 2 to measure the angle of arrival of the wireless signal as an example, the measurement device can determine the angle of arrival of the wireless signal according to the following formula (1).

[0071]

[0072] In formula (1), φ ant1 φ is the phase of the wireless signal received by antenna 1. ant2 φ is the phase of the wireless signal received by antenna 2. ant1 -φ ant2 θ represents the phase difference between the wireless signals received by antenna 1 and antenna 2. d is the distance between antenna 1 and antenna 2, which is usually known. AOA λ is the angle of arrival to be measured. λ is the wavelength of the wireless signal, which is usually known.

[0073] It is understandable that during the angle of arrival measurement process, the measuring equipment obtains φ ant1 and φ ant2 Then, φ ant1 and φ ant2 Substituting into formula (1) yields the angle of arrival θ of the wireless signal. AoA .

[0074] However, see Figure 6 The cosine function f(θ) shown AoA )=cosθ AoA It can be seen that cosθ AoA Regarding θ in the ranges of -180° to 0° and 0° to 180° AoA =0° symmetry, i.e., cosθ = cos(-θ). Therefore, by φ ant1 -φant2 The angle of arrival determined by substituting into formula (1) could be θ or -θ. In other words, the above method cannot distinguish whether the wireless signal is incident from the front or the back of the measuring device, and the measurement results may have a large error.

[0075] Therefore, this application provides an angle of arrival measurement method that utilizes the difference in antenna radiation patterns on the front and back of the measuring device to distinguish the direction of arrival of wireless signals, thereby improving the accuracy of angle of arrival measurement.

[0076] Figure 7A-7B This is a schematic diagram of the measuring device to which the angle of arrival measurement method provided in this application is applicable. As shown in the figure, the measuring device includes an angle of arrival measurement module, a first antenna, and a second antenna.

[0077] The angle of arrival (AHA) measurement module is connected to the first antenna and the second antenna, and uses the first antenna and the second antenna to measure the angle of arrival of the wireless signal. The specific measurement process is described below. In this embodiment, the AHA measurement module can be a UWB module, a Wi-Fi module, a BT module, or an RF module, etc., and this embodiment does not impose any restrictions on this.

[0078] The first antenna is an omnidirectional antenna, and its radiation pattern is basically the same on the front and back of the measuring device. For example, the first antenna can be a frame antenna, and this embodiment does not limit the type of the first antenna.

[0079] For example, when the first antenna is a frame antenna, see [reference needed]. Figure 7A or Figure 7B As shown, the first antenna includes an antenna radiator, a ground point G, and a first feed point F1. The antenna radiator, used for transmitting / receiving wireless signals, is part of the metal frame of the measuring equipment, located between two insulated breaks on the metal frame. The antenna radiator is connected to the ground point G via a grounding line, and the ground point G is connected to the ground plane of the printed circuit board (PCB) of the measuring equipment. Additionally, the antenna radiator is also connected to the first feed point F1 via a feed line. The first feed point F1 is connected to the angle-of-arrival (AOA) measurement module, and the radio frequency (RF) source equipment feeds power to the antenna radiator through the first feed point F1.

[0080] The second antenna is a directional antenna, and its radiation pattern differs significantly between the front and back of the measuring device. For example, this second antenna can be a single patch antenna, a shared patch antenna, etc., and this embodiment does not limit the type of the second antenna.

[0081] For example, when the second antenna is a single patch antenna, see Figure 7AAs shown, the second antenna includes an antenna radiator and a second feed point F2. The antenna radiator is used to emit / receive wireless signals, and is a rectangular metal patch structure arranged on the side of the rear cover of the measurement device facing the screen. The antenna radiator is connected to the second feed point F2 through a feed line, and the second feed point F2 is connected to the angle of arrival measurement module. The radio frequency signal source device feeds the antenna radiator through the second feed point F2.

[0082] Alternatively, when the second antenna is a common patch antenna, referring to Figure 7B As shown, the second antenna includes an antenna radiator, a second feed point F2, a third feed point F3, and a switching switch. The antenna radiator is a rectangular metal patch arranged on the side of the rear cover of the measurement device facing the screen. The width of the metal patch is about 0.35λ, and the length is about 0.4λ, where λ is the wavelength of the wireless signal to be measured. The middle position of one end of the antenna radiator is connected to the second feed point F2 through a feed line, forming a differential mode (DM) antenna. The maximum current area of the antenna radiator is connected to the third feed point F3, constituting a common mode (CM) antenna. The second feed point F2 and the third feed point F3 are connected to the angle of arrival measurement module through the switching switch.

[0083] It can be understood that in the common patch antenna, the angle of arrival measurement module can control whether the second antenna actually used is a DM antenna or a CM antenna through the switching switch. In addition, although the DM antenna and the CM antenna share one antenna radiator, the isolation between them is greater than the threshold, and the influence between them is small, so they can work normally.

[0084] It should be noted that in the above edge antenna, single patch antenna and common patch antenna, the ground line, feed line and other lines may include one or more of capacitors, inductors, resistors and other electronic components in addition to the power supply conductor. The specific structure of the above lines is not limited in the present embodiment.

[0085] Although the differences between the first antenna and the second antenna in shape, structure, etc. are shown in the foregoing, the key difference between the two is the antenna radiation field type. The antenna radiation field types of the first antenna and the second antenna are described in detail below.

[0086] In the embodiment, the antenna radiation patterns are used to describe the correspondence between the energy radiated by the antenna and the positions in the space. The antenna radiation pattern is usually a three-dimensional structure centered on the antenna. It can be understood that, for an ideal point source antenna, the energy radiated by the antenna is the same in all directions, and uniformly attenuated at the same amplitude, so that the antenna radiation pattern tends to be spherical. However, in actual applications, due to the influence of the shape and size of the antenna radiator, the shielding of obstacles (such as device shells, internal elements of the device), and other factors, the energy radiated by the antenna in each direction can be the same or different in size and attenuation amplitude. Therefore, the antenna radiation pattern in actual applications is usually irregular in shape.

[0087] It is worth noting that, in the embodiment, the antenna radiation patterns of the first antenna and the second antenna need to satisfy the following pattern state 1 or pattern state 2.

[0088] Pattern state 1: The antenna radiation patterns of the first antenna and the second antenna are basically the same on the back of the measuring device, and the antenna radiation patterns of the first antenna and the second antenna are quite different on the front of the measuring device.

[0089] Pattern state 2: The antenna radiation patterns of the first antenna and the second antenna are basically the same on the front of the measuring device, and the antenna radiation patterns of the first antenna and the second antenna are quite different on the back of the measuring device.

[0090] Wherein, the antenna radiation patterns of the first antenna and the second antenna being basically the same can be understood as: the antenna radiation patterns of the first antenna and the second antenna are similar; or, in most areas (for example, in more than 70%, 80% of the area), the energy and attenuation of the first antenna and the second antenna radiated in the same direction are basically the same, that is, the difference in energy at the same position is less than a threshold value.

[0091] In addition, the antenna radiation patterns of the first antenna and the second antenna being quite different can be understood as: the antenna radiation patterns of the first antenna and the second antenna are not similar; or, in most areas (for example, in more than 70%, 80% of the area), the energy and / or attenuation of the first antenna and the second antenna radiated in the same direction are quite different, that is, the difference in energy at the same position is greater than a threshold value.

[0092] The following takes pattern state 1 as an example, and respectively combines Figure 8 and Figure 9 to describe the antenna radiation patterns of the first antenna and the second antenna.

[0093] Figure 8 is the antenna radiation pattern of the first antenna and the second antenna provided by the embodiment. The antenna radiation pattern is used to represent the distribution of the energy radiated by the antenna with the angular coordinate at a fixed distance. Specifically, as shown in Figure 8In the polar coordinate system shown, the polar radius represents the magnitude of the energy radiated by the antenna, with the unit being dBi (decibelar gain); the polar angle represents the azimuth relative to the measuring equipment, which includes -180° to 180°; the closed curve in the figure represents the energy at different azimuths at a preset distance from the antenna (e.g., 1m), showing how the energy radiated by the antenna at this distance varies with azimuth. Furthermore, taking the direction shown as an example, the left side of the plane where the measuring equipment is located is the front of the measuring equipment, and the right side of the plane where the measuring equipment is located is the back of the measuring equipment.

[0094] Regarding the first antenna, according to Figure 8 As can be seen from (a) in the figure, at a distance of 1m from the measuring device, the antenna radiation pattern of the first antenna on the front and back of the measuring device is basically symmetrical about the plane where the measuring device is located.

[0095] Taking A1 and A2 as examples, where A1 is a point 1m away from the first antenna in the -40° direction, and A2 is a point 1m away from the first antenna in the 40° direction, and A1 and A2 are symmetrical about the plane where the measuring equipment is located. Figure 8 As can be seen in (a), the energy at position A1 is approximately -2 dBi, and the energy at position A2 is approximately 0 dBi. The difference of 2 dBi is less than the energy threshold (e.g., 3 dBi), and the energies at A1 and A2 are basically the same.

[0096] Taking B1 and B2 as examples, where B1 is a point 1m away from the first antenna in the -60° direction, and B2 is a point 1m away from the first antenna in the 60° direction, and B1 and B2 are symmetrical about the plane where the measuring equipment is located. Figure 8 As can be seen in (a), the energy at the position corresponding to B1 is about 0 dBi, and the energy at the position corresponding to B2 is also about 0 dBi. The difference between the two is 0 dBi, which is less than the energy threshold of 3 dBi. The energies at B1 and B2 are also basically the same.

[0097] Regarding the second line, according to Figure 8 As can be seen in (b), at a distance of 1m from the measuring device, the antenna radiation pattern of the second antenna differs significantly between the front and back of the measuring device. Specifically, the energy radiated by the second antenna towards the front of the measuring device is weaker, while the energy radiated towards the back of the measuring device is stronger.

[0098] Taking C1 and C2 as examples, where C1 is a point 1m away from the second second line in the -40° direction, and C2 is a point 1m away from the second second line in the 40° direction, C1 and C2 are symmetrical about the plane where the measuring equipment is located. From Figure 8As can be seen from (b) in FIG. 6, the energy at the position corresponding to C1 is about -11 dBi, and the energy at the position corresponding to C2 is about -7 dBi, and the difference between the two is 4 dBi, which is greater than the energy threshold 3 dBi, and the energy at C1 and C2 is quite different.

[0099] Taking D1 and D2 as examples, where D1 is a point 1 m away from the second antenna in the direction of -60°, and D2 is a point 1 m away from the second antenna in the direction of 60°, D1 and D2 are symmetrical about the plane where the measuring device is located. From Figure 8 As can be seen from (b) in FIG. 6, the energy at the position corresponding to C1 is about -11 dBi, and the energy at the position corresponding to C2 is about -7 dBi, and the difference between the two is 4 dBi, which is greater than the energy threshold 3 dBi, and the energy at C1 and C2 is quite different.

[0100] In addition, by comparing (a) and (b) in FIG. 6, it can be seen that on the back of the measuring device, the antenna radiation patterns of the first antenna and the second antenna are basically the same, and on the front of the measuring device, the antenna radiation patterns of the first antenna and the second antenna are quite different. Figure 9

[0101] Figure 9 is a three-dimensional antenna radiation pattern diagram of the first antenna and the second antenna provided by an embodiment of the present application. The darker the color of each pixel point in the diagram, the stronger the energy at the position corresponding to the pixel point. In addition, taking the direction of the diagram as an example, the left side of the plane where the measuring device is located is the front of the measuring device, and the right side of the plane where the measuring device is located is the back of the measuring device.

[0102] As for the first antenna, according to (a) in FIG. 6, it can be seen that the antenna radiation patterns of the first antenna on the front and back of the measuring device are basically symmetrical about the plane where the measuring device is located, that is, the energy distribution of the first antenna radiated to the front and back of the measuring device is basically the same. Figure 9

[0103] As for the second antenna, according to (b) in FIG. 6, it can be seen that the antenna radiation patterns of the second antenna on the front and back of the measuring device are quite different. Among them, the energy radiated by the second antenna to the front of the measuring device is weak, and the energy radiated by the second antenna to the back of the measuring device is strong. Figure 9 In addition, by comparing (a) and (b) in FIG. 6, it can be seen that on the back of the measuring device, the antenna radiation patterns of the first antenna and the second antenna are basically the same, and on the front of the measuring device, the antenna radiation patterns of the first antenna and the second antenna are quite different.

[0104] Figure 10

[0105] ​​​​Generally, the more energy an antenna radiates into the surrounding space, the better the antenna receives wireless signals. Therefore, the antenna radiation pattern affects some parameters related to wireless signals. For example, the parameters can be the power of received wireless signals, the distance between a source device transmitting wireless signals and a measurement device, etc. Generally, the more energy an antenna radiates into the surrounding space, the more accurate the measurement of the above-mentioned parameters by the measurement device.

[0106] Based on this, it can be understood that, on the propagation path of wireless signals, when the antenna radiation patterns of the first antenna and the second antenna of the measurement device are similar, the measurement results of the first antenna and the second antenna on the above-mentioned parameters are more similar. When the antenna radiation patterns of the first antenna and the second antenna are quite different, the measurement results of the first antenna and the second antenna on the above-mentioned parameters are more different.

[0107] The following takes the difference (i.e., the ranging difference) between the distance measurements by the first antenna and the second antenna in the field pattern state 1 as an example to illustrate the influence of the difference between the antenna radiation patterns on some parameters.

[0108] Figure 10 An embodiment of the present application provides a ranging difference diagram of the first antenna and the second antenna. In the diagram, the horizontal coordinate is the ground truth of the angle of arrival, and the vertical coordinate is the ranging difference ΔD of the first antenna and the second antenna in the field pattern state 1, where ΔD = |D1-D2|, D1 is the distance between the source device and the measurement device measured by the measurement device using the first antenna, and D2 is the distance between the source device and the measurement device measured by the measurement device using the second antenna.

[0109] By Figure 10 It can be seen that, on the front of the measurement device, because the antenna radiation patterns of the first antenna and the second antenna are quite different, the ranging difference ΔD of the first antenna and the second antenna is large in most of the range on the front. For example, in the angle of arrival of -170°-10°, ΔD is basically between 0.1m and 0.6m. On the back of the measurement device, because the antenna radiation patterns of the first antenna and the second antenna are basically the same, the ranging difference of the first antenna and the second antenna is small in most of the range on the back, and is basically less than 0.1m at each angle of arrival.

[0110] Therefore, the measurement device can determine whether the wireless signal comes from the front or the back of the measurement device according to whether the ranging difference ΔD of the first antenna and the second antenna is greater than a distance threshold (such as 0.1m, 0.15m, etc.). For example, for a wireless signal that satisfies Figure 11The measurement device of the illustrated ranging feature has an effective recognition range covering -170° to -10° and 10° to 170°, and has a large measurement range. Therefore, when the ranging difference ΔD of the first antenna and the second antenna is greater than or equal to the distance threshold, it is determined that the wireless signal comes from the front of the measurement device; and when the ranging difference ΔD of the first antenna and the second antenna is less than the distance threshold, it is determined that the wireless signal comes from the back of the measurement device.

[0111] It should be noted that, under the condition that the antenna radiation pattern of the measurement device satisfies the pattern state 2, i.e., the antenna radiation patterns of the first antenna and the second antenna on the back of the measurement device are basically the same, and the antenna radiation patterns on the front of the measurement device are quite different, when the ranging difference ΔD of the first antenna and the second antenna is greater than or equal to the distance threshold, it is determined that the wireless signal comes from the back of the measurement device; and when the ranging difference ΔD of the first antenna and the second antenna is less than the distance threshold, it is determined that the wireless signal comes from the front of the measurement device.

[0112] Similarly, since the antenna radiation pattern also affects the measured power W of the wireless signal, the first antenna and the second antenna measure different powers of the same wireless signal. Therefore, the measurement device can also determine the area from which the wireless signal comes according to the power difference ΔW = |W1-W2| of the wireless signal. Wherein, W1 is the power of the wireless signal measured by the measurement device using the first antenna, D2 is the power of the wireless signal measured by the measurement device using the second antenna.

[0113] For example, under the condition that the measurement device satisfies the pattern state 1, when the power difference ΔW of the first antenna and the second antenna is greater than or equal to the power threshold, it is determined that the wireless signal comes from the front of the measurement device; and when the power difference ΔW of the first antenna and the second antenna is less than the power threshold, it is determined that the wireless signal comes from the back of the measurement device.

[0114] Alternatively, under the condition that the measurement device satisfies the pattern state 2, when the power difference ΔW of the first antenna and the second antenna is greater than or equal to the distance threshold, it is determined that the wireless signal comes from the back of the measurement device; and when the power difference ΔW of the first antenna and the second antenna is less than the distance threshold, it is determined that the wireless signal comes from the front of the measurement device.

[0115] It can be understood that, since different areas around the measurement device correspond to different angle ranges, for example, the front of the measurement device corresponds to a first angle range (such as -180°-0°), and the back of the measurement device corresponds to a second angle range (such as 0°-180°); or, the back of the measurement device corresponds to the first angle range, and the front of the measurement device corresponds to the second angle range, which is not limited in the embodiment. Therefore, the measurement device can identify the area from which the wireless signal comes, in other words, the measurement device can identify the angle of arrival range of the wireless signal. Based on this, the measurement device can filter out the angle of arrival that does not belong to the angle of arrival range in the angle of arrival measurement process, thereby improving the measurement accuracy of the angle of arrival.

[0116] The angle of arrival measurement process provided by the embodiment of the application will be described in detail below.

[0117] Figure 11 is a schematic flowchart of the angle of arrival measurement method provided by the embodiment of the application. Referring to FIG. 11, the method specifically includes the following steps S1101-S1103. Figure 7A

[0118] S1101, the measurement device determines a difference of a target parameter measured by the first antenna and the second antenna according to the wireless signal.

[0119] In the embodiment, the target parameter is a parameter affected by the antenna radiation pattern, for example, the distance between the measurement device and the signal source device, the power of the wireless signal received by the measurement device, and the like.

[0120] For example, in S1101, the measurement device determines the difference of the target parameter measured by the first antenna and the second antenna according to the wireless signal, specifically including: the measurement device uses the first antenna to determine a first measurement result of the target parameter according to the wireless signal; at the same time, the measurement device uses the second antenna to determine a second measurement result of the target parameter according to the wireless signal. The absolute value of the difference between the first measurement result and the second measurement result is determined as the difference of the target parameter measured by the first antenna and the second antenna.

[0121] S1102, the measurement device determines the angle of arrival range of the wireless signal according to the difference.

[0122] Based on the foregoing description, since the target parameter is affected by the antenna radiation pattern on the propagation path, the difference between the first measurement result and the second measurement result of the target parameter can be used to determine the field pattern difference of the first antenna and the second antenna on the propagation path of the wireless signal, and further determine whether the wireless signal comes from the front or the back of the measurement device, that is, the angle of arrival range of the wireless signal.

[0123] ​For example, when the absolute value of the difference between the first measurement result and the second measurement result is greater than or equal to a threshold value, it is determined that the wireless signal comes from a first angle range. In the first angle range, the antenna radiation pattern difference of the first antenna and the second antenna is large. It should be noted that, according to different antenna settings of the measurement device, the first angle range can be the back of the measurement device, or the front of the measurement device.

[0124] Alternatively, when the absolute value of the difference between the first measurement result and the second measurement result is less than a threshold value, it is determined that the wireless signal comes from a second angle range. The first angle range and the second angle range are different, and in the second angle range, the antenna radiation pattern of the first antenna and the second antenna is substantially the same. Similarly, according to different antenna settings of the measurement device, the second angle range can be the front of the measurement device, or the back of the measurement device.

[0125] S1103, the measurement device determines the angle of arrival of the wireless signal using the first antenna and the second antenna based on the angle range of the arrival of the wireless signal.

[0126] It can be understood that after the angle range of arrival is determined, the measurement device can further determine the angle of arrival of the wireless signal in the angle range of arrival, thereby improving the accuracy of the angle of arrival measurement.

[0127] In summary, by the method provided in the embodiments of the present application, the measurement device identifies whether the wireless signal comes from the front or the back based on the influence of the pattern difference of the front and the back of the first antenna and the second antenna on the distance, power and other measurement parameters, according to the parameter difference measured by using the first antenna and the second antenna, thereby realizing the detection of the wireless signal in the 360° range and improving the angle of arrival measurement accuracy of the measurement device.

[0128] In the following, taking the measurement device satisfying the pattern state 1 as an example, the two aspects of (1) determining the angle range of arrival of the wireless signal, and (2) determining the angle of arrival of the wireless signal based on the angle range of arrival of the wireless signal are described in detail.

[0129] (1) Determining the angle range of arrival of the wireless signal

[0130] For different forms of antennas, the measurement device can use different methods to determine the angle range of arrival of the wireless signal. In the following, taking the measurement device including a first angle range (such as -180°-0°) and a second angle range (such as 0°-180°), and the first angle range corresponding to the front of the measurement device and the second angle range corresponding to the back of the measurement device as an example, the process of determining the angle range of arrival of the wireless signal is described in combination with different examples.

[0131] Example 1: The first antenna is a single frame antenna, and the second antenna is a single patch antenna.

[0132] Referring to Figure 7B As shown, the first antenna of the measuring device is a single-frame antenna, and the second antenna is a single-patch antenna. Among them, the single-frame antenna and the single-patch antenna usually each have only one kind of antenna radiation pattern. Therefore, for a certain wireless signal, the difference between the target parameters measured by the first antenna and the second antenna is determined. According to the difference, in combination with the field pattern state satisfied by the measuring device, the range of the angle of arrival of the wireless signal can be determined.

[0133] For example, in the case where the measuring device satisfies the field pattern state 1, when the difference between the target parameters measured by the first antenna and the second antenna is less than a threshold value, it indicates that the antenna radiation patterns on the propagation path are basically the same when the wireless signal propagates to the first antenna and the second antenna. Therefore, it is determined that the wireless signal comes from the back of the measuring device, that is, the range of the angle of arrival of the wireless signal is the second angle range 0-180°. When the difference between the target parameters measured by the first antenna and the second antenna is greater than or equal to the threshold value, it indicates that the antenna radiation patterns on the propagation path are quite different when the wireless signal propagates to the first antenna and the second antenna. Therefore, it is determined that the wireless signal comes from the front of the measuring device, that is, the range of the angle of arrival of the wireless signal is the first angle range -180°-0°.

[0134] Example 2: The first antenna is a single-frame antenna, and the second antenna is a common-patch antenna.

[0135] Referring to Figure 12 As shown, the first antenna of the measuring device is a single-frame antenna, and the second antenna is a common-patch antenna. Among them, the single-frame antenna usually has only one kind of antenna radiation pattern. However, the common-patch antenna actually includes two antennas, which are DM antenna and CM antenna respectively, and the antenna radiation patterns of the DM antenna and the CM antenna are different. In other words, the second antenna actually has two different antenna radiation patterns.

[0136] Figure 12 is the antenna radiation pattern of the DM antenna and the CM antenna provided by the embodiment of the present application. Referring to Figure 12 It can be seen that the antenna radiation patterns of the DM antenna and the CM antenna on the front of the measuring device are basically the same, but the antenna radiation patterns of the DM antenna and the CM antenna on the back of the measuring device have great differences. Moreover, on the back of the measuring device, the antenna radiation patterns of the DM antenna and the CM antenna can complement each other. For example, as shown in (a) and (b) of Figure 13A , in the range of 0°-40° and 150°-180° on the back of the measuring device, the energy radiated by the DM antenna is less than the energy radiated by the CM antenna. However, in the range of 40°-150° on the back of the measuring device, the energy radiated by the DM antenna is greater than the energy radiated by the CM antenna.

[0137] In the case that there is a difference between the antenna radiation field patterns of the DM antenna and the CM antenna, there is also a certain difference in determining the distance, power and other measurement parameters with the first antenna. The specific differences are shown as follows.

[0138] Figure 13B FIG. 1 is a schematic diagram of the ranging difference between the first antenna and the DM / CM antenna provided in this embodiment. Curve 1 in the figure shows the ranging difference between the first antenna and the DM antenna, and curve 2 shows the ranging difference between the first antenna and the CM antenna. As can be seen from the figure, in the effective measurement range of -160° to -20°, the ranging difference between the first antenna and the DM antenna is less than the threshold value near -130° to -120° and -100° to -90°, and cannot accurately reflect the field pattern difference between the first antenna and the DM antenna; and in the remaining angle range, it is greater than or equal to the distance threshold value, and can accurately reflect the field pattern difference between the first antenna and the DM antenna. In addition, in the effective measurement range of -160° to -20°, the ranging difference between the first antenna and the CM antenna is less than the threshold value near -120° to -110° and -85° to -75°, and cannot accurately reflect the field pattern difference between the first antenna and the CM antenna; and in the remaining angle range, it is greater than or equal to the distance threshold value, and can accurately reflect the field pattern difference between the first antenna and the CM antenna. It can be seen that the angle ranges in which the ranging differences between the DM antenna and the CM antenna cannot reflect the field pattern difference are different. Therefore, the measurement device can use the DM antenna and the CM antenna in combination to identify the difference in the radiation field pattern of the second antenna and the second antenna, and further determine the angle of arrival range of the wireless signal.

[0139] In a possible implementation, for a target parameter, the measurement device can measure a difference value using the DM antenna and the first antenna, measure another difference value using the CM antenna in combination with the first antenna, and use the complementary characteristics of the DM antenna and the CM antenna to determine the angle of arrival range of the wireless signal according to the two difference values, thereby improving the accuracy of the angle of arrival range.

[0140] Taking the distance between the measurement device and the signal source device as an example, the measurement device can fuse the ranging difference ΔD DM between the first antenna and the DM antenna and the ranging difference ΔD CM between the first antenna and the CM antenna to obtain ΔD, so as to accurately reflect the case in which the field pattern difference between the first antenna and the second antenna.

[0141] In this embodiment, the fusion processing of ΔD DM and ΔD CM includes: adding ΔD DM and ΔD CM under the same angle of arrival to obtain ΔD under the angle of arrival, i.e., the ranging difference ΔD = ΔD DM + ΔD CMOr, the average of ΔD CM and ΔD DM at the same angle of arrival is determined as ΔD at the angle of arrival, that is, the ranging difference ΔD = (ΔD DM + ΔD CM ) / 2; or, the maximum of ΔD DM and ΔD CM at the same angle of arrival is determined as ΔD at the angle of arrival, that is, the ranging difference ΔD = max(ΔD DM , ΔD CM ).

[0142] Figure 14 is a schematic diagram of the ranging difference after fusion processing provided by an embodiment of the present application, and the ranging difference ΔD = max(ΔD DM , ΔD CM ) of the first antenna and the second antenna. As can be seen from the figure, in the angle of arrival range of -160° to -20°, the ranging difference ΔD of the first antenna and the second antenna is greater than the distance threshold, which can accurately reflect the field pattern difference of the first antenna and the second antenna, and is helpful to accurately determine the angle of arrival range of the wireless signal. Therefore, in the embodiment, the measuring device can first determine the ranging difference ΔD of the first antenna and the second antenna, and then determine the angle of arrival range of the wireless signal according to whether the ranging difference ΔD is greater than the distance threshold.

[0143] Figure 7B is a flowchart of the angle of arrival range determination provided by an embodiment of the present application. Specifically, it includes the following steps S1401-S1406.

[0144] S1401, the measuring device switches the second antenna to the DM antenna.

[0145] Specifically, taking the measuring device shown in FIG. 13 as an example, the measuring device can control the switching switch to connect the feed point F2 through the angle of arrival measurement module, so as to switch the second antenna to the DM state, that is, switch the second antenna to the DM antenna. Figure 7B

[0146] S1402, the measuring device determines the first difference ΔD DM of the distances measured by the first antenna and the DM antenna.

[0147] In the embodiment, the measuring device can measure the distance A between the signal source device and the measuring device through the first antenna and the distance B between the signal source device and the measuring device through the CM antenna based on UWB ranging or the like. It can be understood that the difference between the distance A and the distance B, that is, the first difference ΔD DM .

[0148] S1403, the measuring device switches the second antenna to the CM antenna.

[0149] ​Similarly, with Figure 15 Taking the measurement device shown as an example, the measurement device can control the switching switch to connect to feed point F3 through the angle of arrival measurement module, thereby switching the second antenna to CM state, that is, switching the second antenna to CM antenna.

[0150] S1404, The measuring device determines the second difference ΔD between the distances measured by the first antenna and the CM antenna. CM .

[0151] Similarly, in this embodiment, the measuring device can also measure the distance C between the source device and the measuring device using a first antenna based on UWB ranging or other methods, and measure the distance D between the source device and the measuring device using a CM antenna. It can be understood that the difference between distance C and distance D is the second difference ΔD. CM .

[0152] S1405, Measuring equipment determines ΔD DM and ΔD CM The maximum value in max(ΔD) DM ,ΔD CM ).

[0153] S1406, the measuring device is based on max(ΔD) DM ,ΔD CM The range of the wireless signal's angle of arrival is determined by the field configuration of the measuring equipment and the field status.

[0154] Taking the first and second antennas satisfying field pattern state 1 as an example, when max(ΔD) DM ,ΔD CM When the distance is less than the distance threshold, it indicates that the antenna radiation patterns along the propagation path of the wireless signal to the first and second antennas are basically the same. This wireless signal originates from the back of the measuring device, and its angle of arrival ranges from 0 to 180°. However, when max(ΔD) DM ,ΔD CM When the distance is greater than or equal to the distance threshold, it indicates that the antenna radiation pattern on the propagation path of the wireless signal is significantly different when it propagates to the first and second antennas. The wireless signal comes from the front of the measuring device and its angle of arrival ranges from -180° to 0°.

[0155] (ii) Determining the angle of arrival of a wireless signal based on its range

[0156] The measuring equipment typically has a preset phase difference φ for the wireless signal. ant1 -φ ant2correspondence between the real value of the phase difference and the real value of the angle of arrival, which is measured by the measuring device in a laboratory or the like. It can be understood that the correspondence is usually fixed for each measuring device. Therefore, the measuring device determines the measured value of the phase difference φ ant1 -φ ant2 Then, the measured value of the phase difference φ ant1 -φ ant2 and the correlation between the real value of the phase difference and the real value of the angle of arrival at different angles of arrival, and determines the angle of arrival of the wireless signal according to the correlation.

[0157] Figure 15 is a schematic diagram of the correlation of the phase difference provided by an embodiment of the present application. The abscissa in the diagram is the real value of the angle of arrival, and the first angle range -180°-0° corresponds to the front of the measuring device, and the second angle range 0°-180° is located at the back of the measuring device. The ordinate in the diagram is the correlation of the measured value and the real value of the phase difference at different angles of arrival, and the greater the value of the correlation, the higher the possibility that the corresponding angle of arrival is the real angle of arrival. Therefore, the measuring device usually determines the angle of arrival corresponding to one or more higher correlations as the angle of arrival of the wireless signal. However, the phase difference of the two wireless signals with the angles of arrival of θ and -θ is basically the same, and the correlation of the phase difference with the real value of the phase difference at θ and -θ may be large, resulting in inaccurate measurement of the angle of arrival. For example Figure 15 As shown, the correlations corresponding to the angles of arrival of -110° and 110° are both large, and therefore, -110° and 110° may both be the angle of arrival of the wireless signal, resulting in inaccurate measurement of the angle of arrival.

[0158] Therefore, in the embodiment, the measuring device determines the measured value of the phase difference of the wireless signal within the range of the angle of arrival after determining the range of the angle of arrival of the wireless signal, and determines the measured value of the phase difference of the wireless signal according to the correlation of the phase difference at different angles of arrival within the range of the angle of arrival.

[0159] For example, when the range of the angle of arrival of the wireless signal is between -180° and 0°, the measuring device can determine the measured value of the phase difference of the wireless signal and the correlation of the phase difference at different angles of arrival within -180° and 0°, and determine the angle of arrival of the wireless signal according to the correlation. For example Figure 15 As shown, according to the maximum correlation in Figure 16 , the measuring device can determine that the angle of arrival of the wireless signal is -110° within -180° and 0°, thereby improving the accuracy of the angle of arrival measurement by the measuring device.

[0160] The measurement device can first determine the range of the angle of arrival of the wireless signal, and then perform the angle of arrival measurement within the range; or first perform the angle of arrival measurement and determine multiple candidate angles of arrival, then determine the range of the angle of arrival of the wireless signal, and screen the candidate angles of arrival according to the range to determine the final angle of arrival. For details, see Examples 1 and 2 below.

[0161] Example 1: The measurement device first determines the range of the angle of arrival of the wireless signal, and then performs the angle of arrival measurement within the range.

[0162] Figure 17 is a schematic diagram of the measurement process of the angle of arrival provided by an embodiment of the present application. Specifically, it includes the following steps S1601-S1604.

[0163] S1601: The measurement device determines the range of the angle of arrival of the wireless signal. For details, see the foregoing, which will not be repeated here.

[0164] S1602: The measurement device determines the measured value of the phase difference of the wireless signal received by the first antenna and the second antenna.

[0165] S1603: The measurement device determines the correlation between the measured value of the phase difference and the true value of the phase difference at different angles of arrival within the range of the angle of arrival.

[0166] For example, when the wireless signal comes from the front of the measurement device, the range of the angle of arrival is -180°-0°, and the measured value of the phase difference is ant1 -φ ant2 The correlation between the measured value of the phase difference and the true value of the phase difference of the wireless signal within the range of -180°-0° is shown in Figure 17 .

[0167] It should be noted that in this embodiment, the measurement device does not need to determine the correlation between the measured value and the true value of the phase difference within the range of 0°-180°, which can reduce the computational load of the measurement device and improve the measurement rate of the angle of arrival.

[0168] S1604: The measurement device determines the angle of arrival of the wireless signal according to the correlation.

[0169] In some embodiments, the measurement device can determine the angle of arrival of the wireless signal with the highest phase difference correlation. For example, the correlation diagram shown in Figure 18 shows that the correlation of the phase difference at the angle of arrival -110° is the highest, so -110° is determined as the angle of arrival of the wireless signal.

[0170] Example 2: The measuring device first determines multiple candidate angles of arrival, and then filters the candidate angles of arrival based on the range of the wireless signal angle of arrival, thereby determining the final angle of arrival.

[0171] Figure 15 This is a schematic diagram of the angle of arrival measurement process provided in another embodiment of this application. Specifically, it includes the following steps S1801 to S1805.

[0172] S1801, the measuring device determines the measured value of the phase difference between the wireless signals received by the first antenna and the second antenna.

[0173] It should be noted that when the second antenna is a shared antenna, the measured value of the phase difference can be the measured value of the phase difference between the first antenna and the DM antenna, or the measured value of the phase difference between the first antenna and the CM antenna.

[0174] S1802, the measuring device determines the correlation between the measured value of the phase difference and the true value of the phase difference at each angle of arrival within the range of -180° to 180°.

[0175] In one embodiment, the correlation between the measured value of the phase difference and the true values ​​of the various phase differences of the wireless signal within the range of -180° to 180° is as follows: Figure 15 As shown.

[0176] S1803, the measuring device determines the candidate angle of arrival for the wireless signal based on this correlation.

[0177] by Figure 19 Taking the correlation diagram shown as an example, the measuring device can determine multiple angles of arrival with high correlation, such as -110° and 110°, as candidate angles of arrival for wireless signals.

[0178] S1804, the measuring equipment determines the angle of arrival range of the wireless signal. See the previous text for details, which will not be repeated here.

[0179] S1805, the measuring device determines the candidate angles of arrival within the angle of arrival range as the angle of arrival of the wireless signal.

[0180] Taking the range of the angle of arrival of a wireless signal as -180° to 0°, with candidate angles of arrival including -110° and 110° as an example, the measuring device can determine -110°, which is located within the range of -180° to 0°, as the angle of arrival of the wireless signal.

[0181] In this embodiment, after determining that the angle of arrival of the wireless signal is -110°, the measuring device can display, for example... Figure 20The direction indication information is shown to indicate the direction of the wireless signal to the user. It can be understood that the direction of the wireless signal is also the direction of the source device relative to the measuring device. In addition, the measuring device can also measure the distance information between the device and the source device of the wireless signal, for example, the distance 11m.

[0182] In summary, by the arrival angle measurement method provided in this embodiment, after determining the arrival angle range of the wireless signal, the measuring device can further determine the arrival angle of the wireless signal within the arrival angle range, thereby improving the measurement accuracy of the arrival angle.

[0183] However, in some special cases, for example Figure 20 As shown in (a) in FIG. 11, the measured value of the phase difference has a high correlation with the true value at multiple arrival angles such as -178°, -135°, -60°, -18° and 50°. Based on this, referring to (b) in FIG. 11, even if the measuring device identifies that the wireless signal comes from the back by the above method and narrows down the possible arrival angle range to -180°-0°, it can only exclude 50° and cannot accurately determine the arrival angle from -178°, -135°, -60° and -18°. Figure 7A

[0184] Therefore, in order to further improve the accuracy of the arrival angle measurement result, the measuring device can also combine the rotation operation of the measuring device to further determine the arrival angle. The arrival angle measurement method will be described below in conjunction with the measuring device shown in Figure 7B It should be understood that the arrival angle measurement method provided in this embodiment can also be applied to the measuring device including a common antenna as shown in Figure 21

[0185] Figure 21 is a schematic flowchart of the arrival angle measurement method provided in other embodiments of the present application. Referring to Figure 22 The method includes the following steps S2101-S2106.

[0186] S2101, the measuring device displays prompt information, which is used to prompt the user to change the posture of the measuring device.

[0187] In some embodiments, the measuring device can display a rotation prompt icon as shown in Figure 23 to prompt the user to rotate the phone left and right. Alternatively, the measuring device can display prompt text such as "keep the phone vertical and slowly rotate the phone left and right" to prompt the user to rotate the phone left and right.

[0188] S2102, the measuring device determines the arrival angle range of the wireless signal. For details, please refer to the foregoing, which will not be repeated here.

[0189] ​​It should be noted that the present embodiment does not limit the execution order of S2101 and S2102. In other words, the measuring device can execute S2101 first and then execute S2102, or execute S2102 first and then execute S2101.

[0190] S2103, the measuring device determines the measured value of the phase difference of the wireless signal at different time instants in the process of changing the posture.

[0191] For example, the measuring device can determine the phase difference of the wireless signal at T1, T2 and T3 respectively.

[0192] S2104, the measuring device determines the correlation between the measured value of the phase difference of the wireless signal at different time instants and the true value of the phase difference at different angles of arrival within the range of the angle of arrival of the wireless signal.

[0193] Taking the range of the angle of arrival of the wireless signal as -180°-0°, the correlation between the measured value and the true value of the phase difference at T1, T2 and T3 respectively is shown in (a), (b) and (c) of FIG. 8. As can be seen from the figure, there are multiple points with high phase difference correlation at T1, T2 and T3, so the measuring device cannot accurately identify the angle of arrival of the wireless signal according to the correlation at each of the above time instants alone. Figure 23

[0194] Therefore, the present embodiment fuses the correlation between the measured value and the true value of the phase difference of the wireless signal at different time instants, and determines the angle of arrival of the wireless signal according to the fused phase difference. For details, see S2105-S2106.

[0195] S2105, the measuring device fuses the correlation between the measured value and the true value of the phase difference of the wireless signal at different time instants to obtain the fused correlation.

[0196] In the present embodiment, the measuring device fuses the correlation at different time instants, including: the measuring device adds the correlation at the same angle of arrival at different time instants to obtain the fused correlation. For example, the correlation at the same angle of arrival at T1, T2 and T3 is added to obtain the correlation shown in (d) of FIG. 8. Figure 23

[0197] It should be noted that the present embodiment does not limit the fusion processing method, for example, the measuring device can also determine the average of the correlation at the same angle of arrival at different time instants, and take the average as the fused correlation.

[0198] S2106, the measuring device determines the angle of arrival of the wireless signal according to the fused correlation.

[0199] ​​For example, the measuring device can determine the angle of arrival corresponding to the maximum correlation as the angle of arrival of the wireless signal. Figure 24 For example, the measuring device can determine the angle of arrival corresponding to the maximum correlation as the angle of arrival of the wireless signal.

[0200] In addition, in the embodiment, after determining that the angle of arrival of the wireless signal is -60°, the measuring device can display, for example, the direction indication information shown in FIG. 6B to indicate the direction from which the wireless signal comes to the user. In addition, the measuring device can also measure the distance between the measuring device and the source device of the wireless signal, for example, the distance is 5 m. Figure 25

[0201] Figure 26 FIG. 7 is a schematic diagram of an angle of arrival measurement error provided in an embodiment of the present application. In the diagram, the horizontal coordinate is the true value of the angle of arrival, and the vertical coordinate is the measurement error of the angle of arrival, which is the difference between the true value and the measured value of the angle of arrival. It can be seen that, in the angle measurement range (field of view, FOV) of -120° to -70° and 40° to 150°, the absolute value of the average measurement error of the angle of arrival is less than 10°. That is, through the method provided in the embodiment, the measurement result of the angle of arrival is relatively accurate.

[0202] In summary, through the method provided in the embodiment of the present application, the measuring device can improve the accuracy of the angle of arrival measurement by rotating the mobile phone to assist the angle measurement.

[0203] It should be understood that the size of the serial number of each step in the above embodiments does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0204] Based on the same concept, as an implementation of the above method, the embodiments of the present application provide the following technical solutions. The embodiments of these technical solutions correspond to the above method embodiments, and for the sake of reading, the details in the above method embodiments will not be described one by one, but it should be clear that each scheme in the present embodiment can correspond to the implementation of all the contents in the above method embodiments.

[0205] The present application also provides a chip, as shown in FIG. 8, which includes a processor and a memory, and the memory stores a computer program, which is executed by the processor to implement the angle of arrival measurement method provided in each of the above embodiments. ​

[0206] The present application also provides a computer readable storage medium, which stores a computer program, which is executed by a processor to implement the angle of arrival measurement method shown in each of the above embodiments.​​

[0207] The embodiments of the present application further provide a computer program product, which comprises a computer program. When the computer program is executed by an electronic device, the electronic device realizes the angle of arrival measurement method shown in the above embodiments.

[0208] It should be understood that the processor mentioned in the embodiments of the present application can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0209] It should also be understood that the memory mentioned in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically EPROM (EEPROM) or a flash memory. The volatile memory can be a random access memory (RAM) used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM) and direct rambus RAM (DR RAM).

[0210] In the embodiments provided by the present application, the division of each framework or module is only a logical function division, and another division manner can be used in actual implementation, for example, multiple frameworks or modules can be combined or integrated into another system, or some features can be ignored or not executed.

[0211] In addition, each function module in each embodiment of the present application can be integrated in one processing module, or each module can exist physically, or two or more modules can be integrated in one module. The integrated module can be realized in the form of hardware or in the form of a software function module.

[0212] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiments, which will not be described here.

[0213] In the present application, the reference to "one embodiment" or "some embodiments" means that the specific features, structures or characteristics described in connection with the embodiment are included in one or more embodiments of the present application. Therefore, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in other some embodiments" and the like appearing in different places in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "include", "contain", "have" and their variants mean "include but not limited to", unless otherwise specifically emphasized.

[0214] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A method for measuring angle of arrival, characterized in that, The invention is applied to an electronic device, which includes a first antenna and a second antenna. The first antenna is an omnidirectional antenna, and the second antenna is a directional antenna. The antenna radiation patterns of the first antenna and the second antenna are similar in a first angular range on the front of the electronic device and dissimilar in a second angular range on the back of the electronic device, or dissimilar in the first angular range on the front of the electronic device and similar in the second angular range on the back of the electronic device. The method includes: Determine the difference between the target parameters measured by the first antenna and the second antenna based on the wireless signal; Based on the difference, the angle of arrival range of the wireless signal is determined; wherein the angle of arrival range is the first angle range of the front of the electronic device, or the second angle range of the back of the electronic device; The angle of arrival of the wireless signal is measured using the first antenna and the second antenna, based on the angle of arrival range, where the angle of arrival is within the angle of arrival range.

2. The method according to claim 1, characterized in that, Based on the difference, the range of the angle of arrival of the wireless signal is determined, including: When the difference is less than or equal to the threshold, the range of the angle of arrival of the wireless signal is determined to be the first angle range; When the difference is greater than the threshold, the range of the angle of arrival of the wireless signal is determined to be the second angle range.

3. The method according to claim 1, characterized in that, The front side is the side facing the screen of the electronic device, and the back side is the side facing the back cover of the electronic device; or, the front side is the area facing the top of the screen of the electronic device, and the back side is the area facing the bottom of the screen of the electronic device.

4. The method according to any one of claims 1 to 3, characterized in that, The target parameter is the distance from the source device to the electronic device, whereby the source device is used to transmit the wireless signal; or, The target parameter is the power of the received wireless signal.

5. The method according to any one of claims 1 to 3, characterized in that, Determining the difference between the target parameters measured by the first antenna and the second antenna based on the wireless signal includes: Using the first antenna, a first measurement result of the target parameter is determined based on the wireless signal; Using the second antenna, a second measurement result of the target parameter is determined based on the wireless signal; The absolute value of the difference between the first measurement result and the second measurement result is determined as the difference between the target parameters measured by the first antenna and the second antenna.

6. The method according to any one of claims 1 to 3, characterized in that, The second antenna is a shared antenna, which includes a differential-mode (DM) antenna and a common-mode (CM) antenna; correspondingly, determining the difference between the target parameters measured by the first antenna and the second antenna based on the wireless signal includes: Determine a first difference between the target parameters measured by the first antenna and the DM antenna based on the wireless signal; Determine a second difference between the target parameters measured by the first antenna and the CM antenna based on the wireless signal; Based on the first difference and the second difference, the difference between the target parameters measured using the first antenna and the second antenna is determined.

7. The method according to claim 6, characterized in that, Determining the measurement difference between the first antenna and the second antenna for the target parameter based on the first difference and the second difference includes: The maximum value between the first difference and the second difference is determined as the difference between the target parameters measured by the first antenna and the second antenna based on the wireless signal; or, The average of the first difference and the second difference is determined as the difference between the target parameters measured by the first antenna and the second antenna based on the wireless signal.

8. The method according to any one of claims 1 to 3 or 7, characterized in that, The first antenna is a frame antenna, and the second antenna is a patch antenna.

9. The method according to any one of claims 1 to 3 or 7, characterized in that, Measuring the angle of arrival of the wireless signal using the first antenna and the second antenna, based on the stated angle of arrival range, includes: During the rotation of the electronic device, within the angle of arrival range, the correlation between the measured values ​​of the phase difference of the wireless signal at multiple different times and the true values ​​of the phase difference at different angles of arrival is determined; The correlations at multiple different times are fused to obtain the fused correlations. The angle of arrival of the wireless signal is determined based on the fused correlation.

10. The method according to claim 9, characterized in that, Determining the angle of arrival of the wireless signal based on the fused correlation includes: Determine the maximum value among the correlations after fusion; The angle of arrival corresponding to the maximum value is determined as the angle of arrival of the wireless signal.

11. The method according to any one of claims 1 to 3, 7 or 10, characterized in that, The sum of the first angular range and the second angular range covers 360° around the electronic device.

12. An electronic device, characterized in that, The device includes a first antenna and a second antenna; the antenna radiation patterns of the first antenna and the second antenna are similar within a first angular range around the electronic device and dissimilar within a second angular range around the electronic device; the electronic device is configured to perform the method as described in any one of claims 1 to 11.

13. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method performed as claimed in any one of claims 1 to 11.

14. A chip, characterized in that, It includes a processor and a memory, wherein the memory stores a computer program that, when executed by the processor, implements the method performed as claimed in any one of claims 1 to 11.

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