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

Abstract

The present application relates to the technical field of wireless positioning. Provided are an angle-of-arrival measurement method, and an electronic device, a readable storage medium and a chip. The method is applied to an electronic device, which comprises a first antenna and a second antenna, wherein the antenna radiation pattern of the first antenna and the antenna radiation pattern of the second antenna are similar to each other within a first angle range around the electronic device, but are not similar to each other within a second angle range around the electronic device. The method comprises: determining the difference between target parameters, which are measured by a first antenna and a second antenna on the basis of a wireless signal; determining an angle-of-arrival range of the wireless signal on the basis of the difference, wherein the angle-of-arrival range is a first angle range or a second angle range; and using the first antenna and the second antenna to measure an angle of arrival of the wireless signal on the basis of the angle-of-arrival range. The technical solution provided in the present embodiment can improve the accuracy of angle-of-arrival measurement.

Description

Arrival angle measurement method, electronic device, readable storage medium and chip

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on October 27, 2023, with application number 202311421264.X and application name “Arrival angle measurement method, electronic device, readable storage medium and chip”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of wireless positioning technology, and in particular to an arrival angle measurement method, electronic device, readable storage medium and chip. Background Art

[0003] Electronic devices can determine the direction of the signal source of a wireless signal relative to the electronic device based on the angle of arrival (AoA) of the wireless signal, thereby achieving device positioning. Currently, electronic devices usually determine the angle of arrival of the wireless signal based on the phase difference of the wireless signals received by different antennas. However, for two wireless signals symmetrically incident from the front and back of the electronic device, that is, two wireless signals with angles of arrival of θ and -θ respectively, their phase difference is the same. Therefore, when an electronic device determines the angle of arrival of a wireless signal based on the phase difference, it is usually unable to distinguish whether the wireless signal comes from the front or back of the device, resulting in large errors in the measurement results.

[0004] Summary of the Invention

[0005] The present application provides an arrival angle measurement method, electronic device, readable storage medium and chip, which are used to solve the problem of large arrival angle measurement errors in the prior art.

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] In a first aspect, embodiments of the present application provide an angle-of-arrival measurement method, which is applied to an electronic device comprising a first antenna and a second antenna; wherein 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 method comprises: determining a difference in a target parameter measured based on a wireless signal using the first antenna and the second antenna; determining an angle-of-arrival range of the wireless signal based on the difference; wherein the angle-of-arrival range is either the first angular range or the second angular range described above; and measuring the angle-of-arrival of the wireless signal using the first antenna and the second antenna based on the angle-of-arrival range.

[0008] In this embodiment, the electronic device first identifies the arrival angle range of the wireless signal based on the difference in field patterns of the first antenna and the second antenna in different angle ranges, and according to the measurement difference of the target parameters by the first antenna and the second antenna, and then performs arrival angle measurement within the arrival angle range, thereby improving the arrival angle measurement accuracy.

[0009] In some embodiments, the arrival angle range of the wireless signal is determined based on the difference, including: when the difference is less than or equal to a threshold, determining that the arrival angle range of the wireless signal is the first angle range; when the difference is greater than the threshold, determining that the arrival angle range of the wireless signal is the second angle range.

[0010] In some embodiments, the first angle range corresponds to the back of the electronic device, and the second angle range corresponds to the front of the electronic device; or, the first angle range corresponds to the front of the electronic device, and the second angle range corresponds to the back of the electronic device; wherein the front is the side facing the electronic device screen, and the back is the side facing the electronic device back cover; or, the front is the area facing the top of the electronic device screen, and the back is the area facing the bottom of the electronic device screen. Using this method, the electronic device can improve the accuracy of arrival angle measurement for the front and back of the electronic device.

[0011] In some embodiments, the target parameter is the distance between a source device and an electronic device, where the source device is used to transmit wireless signals; or the target parameter is the power of a received wireless signal. It should be noted that the target parameter is a parameter affected by the antenna radiation pattern.

[0012] In some embodiments, determining the difference between the target parameter measured based on the wireless signal using the first antenna and the second antenna includes: using the first antenna to determine a first measurement result of the target parameter based on the wireless signal; using the second antenna to determine a second measurement result of the target parameter based on the wireless signal; and determining the absolute value of the difference between the first measurement result and the second measurement result as the difference between the target parameter measured by the first antenna and the second antenna.

[0013] In this embodiment, the difference in the target parameter measurements of the first antenna and the second antenna reflects the difference in the antenna radiation patterns of the first antenna and the second antenna on the wireless signal propagation path, thereby determining the arrival angle range of the wireless signal.

[0014] In some embodiments, the second antenna is a co-body antenna, which includes a differential mode DM antenna and a common mode CM antenna; accordingly, determining the difference between the target parameters measured by the first antenna and the second antenna based on the wireless signal includes: determining a first difference between the target parameters measured by the first antenna and the DM antenna based on the wireless signal; determining a second difference between the target parameters measured by the second antenna and the CM antenna based on the wireless signal; and determining the difference between the target parameters measured using the first antenna and the second antenna based on the first difference and the second difference.

[0015] In this embodiment, based on the complementary antenna radiation patterns of the DM antenna and the CM antenna, the electronic device jointly determines the arrival angle range of the wireless signal according to the measured difference of the target parameter between the first antenna and the DM antenna, and the measured difference of the target parameter between the first antenna and the CM antenna, to improve the accuracy of the arrival angle range.

[0016] In some embodiments, the measurement difference of the target parameter by the first antenna and the second antenna is determined based on the first difference and the second difference, including: determining the maximum value of the first difference and the second difference as the difference of the target parameter measured by the first antenna and the second antenna based on the wireless signal; or determining the average value of the first difference and the second difference as the difference of the target parameter measured by the first antenna and the second antenna based on the wireless signal.

[0017] In some embodiments, the first antenna is a frame antenna, and the second antenna is a patch antenna. The frame antenna's radiator is the metal frame of the phone, making it easy to configure as an omnidirectional antenna. The patch antenna's radiator is a metal patch, making it easy to configure as a directional antenna. The antenna radiation patterns of omnidirectional and directional antennas are similar within a first angular range and dissimilar within a second angular range, thus facilitating the implementation of the angle of arrival measurement method provided in this embodiment.

[0018] In some embodiments, based on the arrival angle range, the arrival angle of the wireless signal is measured using a first antenna and a second antenna, including: during the rotation of the electronic device, within the arrival angle range, determining the correlation between the measured value of the phase difference of the wireless signal at multiple different moments and the true value of the phase difference at different arrival angles; fusing the correlations at the multiple different moments to obtain the fused correlation; and determining the arrival angle of the wireless signal based on the fused correlation.

[0019] Through the method provided in the embodiment of the present application, the electronic device can further improve the accuracy of arrival angle measurement by rotating the mobile phone to assist in angle measurement.

[0020] In some embodiments, determining the arrival angle of the wireless signal based on the fused correlation includes: determining the maximum value in the fused correlation; and determining the arrival angle corresponding to the maximum value as the arrival angle of the wireless signal.

[0021] In some embodiments, the sum of the first angle range and the second angle range covers 360° around the electronic device.

[0022] In a second aspect, an embodiment of the present application provides an electronic device, comprising a first antenna and a second antenna; the antenna radiation patterns of the first antenna and the second antenna are similar within a first angle range around the electronic device and are dissimilar within a second angle range around the electronic device; the electronic device is configured to execute the method shown in the first aspect above.

[0023] In a third aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the method shown in the first aspect above.

[0024] In a fourth aspect, an embodiment of the present application provides a chip, which includes a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the method shown in the first aspect above is implemented.

[0025] In a fifth aspect, an embodiment of the present application provides a computer program product, which stores a computer program. When the computer program is run by an electronic device, it can enable the electronic device to execute the method shown in the first aspect above.

[0026] It can be understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a schematic diagram of an angle of arrival measurement system provided in an embodiment of the present application;

[0028] FIG2A is a schematic diagram of an arrival angle measurement posture provided by an embodiment of the present application;

[0029] FIG2B is a schematic diagram of the front and back of a measuring device provided in an embodiment of the present application;

[0030] FIG3 is a schematic diagram of an arrival angle measurement posture provided by another embodiment of the present application;

[0031] FIG4 is a schematic diagram of the angle of arrival provided by an embodiment of the present application;

[0032] FIG5 is a schematic diagram of the angle of arrival measurement principle provided by an embodiment of the present application;

[0033] FIG6 is a schematic diagram of a cosine function provided in an embodiment of the present application;

[0034] FIG7A is a schematic structural diagram of a measurement device applicable to an angle of arrival measurement method provided in one embodiment of the present application;

[0035] FIG7B is a schematic structural diagram of a measurement device applicable to an angle of arrival measurement method provided in another embodiment of the present application;

[0036] FIG8 is an antenna radiation pattern of a first antenna and a second antenna provided in an embodiment of the present application;

[0037] FIG9 is a three-dimensional antenna radiation pattern diagram of the first antenna and the second antenna provided in an embodiment of the present application;

[0038] FIG10 is a schematic diagram of the ranging difference between the first antenna and the second antenna provided in one embodiment of the present application;

[0039] FIG11 is a schematic flow chart of an arrival angle measurement method provided in an embodiment of the present application;

[0040] FIG12 is an antenna radiation pattern of a DM antenna and a CM antenna provided in an embodiment of the present application;

[0041] FIG13A is a schematic diagram of the ranging difference between the first antenna and the DM / CM antenna provided in an embodiment of the present application;

[0042] FIG13B is a schematic diagram of the ranging difference after fusion processing provided in an embodiment of the present application;

[0043] FIG14 is a flowchart of determining an angle of arrival range according to an embodiment of the present application;

[0044] FIG15 is a schematic diagram of the correlation of phase differences provided by one embodiment of the present application;

[0045] FIG16 is a schematic diagram of an arrival angle measurement process provided by an embodiment of the present application;

[0046] FIG17 is a schematic diagram of the correlation of phase differences provided by one embodiment of the present application;

[0047] FIG18 is a schematic diagram of an arrival angle measurement process provided by another embodiment of the present application;

[0048] FIG19 is a schematic diagram of a display interface of a measuring device provided by one embodiment of the present application;

[0049] FIG20 is a schematic diagram of phase difference correlation provided by another embodiment of the present application;

[0050] FIG21 is a schematic flowchart of an arrival angle measurement method provided in another embodiment of the present application;

[0051] FIG22 is a schematic diagram of a display interface of a measuring device provided in another embodiment of the present application;

[0052] FIG23 is a schematic diagram of the correlation of phase differences provided by yet another embodiment of the present application;

[0053] FIG24 is a schematic diagram of a display interface of a measuring device provided in yet another embodiment of the present application;

[0054] FIG25 is a schematic diagram of an angle of arrival measurement error provided by an embodiment of the present application;

[0055] Figure 26 is a schematic diagram of the structure of the chip provided in an embodiment of the present application. DETAILED DESCRIPTION

[0056] It should be understood that in the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is merely a way to describe the association relationship of associated objects, indicating that three relationships can exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0057] In this embodiment, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this embodiment, unless otherwise specified, "plurality" means two or more.

[0058] The technical solutions provided in the embodiments of the present application are described below with reference to the accompanying drawings.

[0059] The angle of arrival (AoA) is a key parameter in wireless positioning technology. It represents the angle between the incoming wireless signal and the line containing the AoA measurement antenna (hereinafter referred to as the antenna). Using AoA measurement, electronic devices can locate the source device transmitting the wireless signal, or, using the source device's location information, reversely locate the electronic device. AoA measurement technology has a wide range of applications in wireless positioning technology.

[0060] Figure 1 is a schematic diagram of an arrival angle measurement system provided by an embodiment of the present application. Referring to Figure 1 , the arrival angle measurement system includes a measurement device and a signal source device, wherein the measurement device and the signal source device are connected via wireless communication technology.

[0061] In this embodiment, electronic devices such as the measuring device and the source device can be mobile phones, tablet computers, smart home devices with wireless transceiver functions (such as smart TVs, smart speakers, robot vacuums, smart air conditioners, etc.), computers with wireless transceiver functions, smart TVs, projectors, wearable devices (such as smart watches), vehicle-mounted devices, augmented reality (AR) / virtual reality (VR) devices, ultra-mobile personal computers (UMPCs), netbooks, personal digital assistants (PDAs), routers, etc. The embodiments of the present application do not limit the specific types of the measuring device and the source device.

[0062] In addition, the wireless communication technology can be wireless fidelity (Wi-Fi), traditional Bluetooth (BT), low-energy Bluetooth (BLE), ultra-wide band (UWB) or radio frequency (RF) communication technology, etc., and the embodiments of the present application are not limited to this.

[0063] The source device is configured to transmit the wireless signal required for the angle of arrival measurement process. The wireless signal may be a measurement frame, a beacon frame, or the like. Optionally, the source device may transmit the wireless signal autonomously or in response to instructions from the measurement device. The wireless signal may be a WiFi signal, a Bluetooth signal, an UWB signal, or a FR signal, and is not limited in this embodiment.

[0064] A measuring device is configured to receive a wireless signal transmitted by a source device via at least two antennas, and determine an angle of arrival of the wireless signal based on a phase difference Δφ between the wireless signals received by the at least two antennas. Exemplarily, the measuring device may calculate the angle of arrival of the wireless signal using an angle of arrival calculation formula, or may determine the angle of arrival of the wireless signal based on a mapping relationship between the phase difference and the angle of arrival, although this embodiment does not limit this.

[0065] It should be noted that the antenna in this embodiment refers to an antenna for angle of arrival measurement. It should be understood that, although not shown in this embodiment, the measuring device may include other antennas in addition to the above-mentioned antenna for angle of arrival measurement, such as an antenna for receiving satellite positioning signals, an antenna for receiving cellular signals, etc. In addition, the embodiment of the present application does not limit the operating frequency band of the antenna. For example, it can be a 2.4GHz / 5GHz Wi-Fi band, a 2.4GHz Bluetooth band, or a 3.1-10.6GHz UWB band, a 5GHz new radio (NR) band, etc.

[0066] During the arrival angle measurement process, the measuring device usually needs to maintain a preset posture. This is exemplified below.

[0067] Figure 2A is a schematic diagram of an angle-of-arrival measurement posture provided by one embodiment of the present application. As shown in Figure 2A , during the angle-of-arrival measurement process, the measuring device remains essentially vertical, with the screen of the measuring device essentially perpendicular to the horizontal plane. The line along which antennas 1 and 2, used for angle-of-arrival measurement, lie within the measuring device remains essentially horizontal. This allows antennas 1 and 2 to measure the angle of arrival of wireless signals originating from both the front and back of the measuring device.

[0068] It should be noted that in this angle-of-arrival measurement posture, as shown in FIG2B , the front of the measurement device refers to the direction in which the display screen of the measurement device faces. This display screen displays images related to the angle-of-arrival measurement, such as an arrow indicating the direction of the incoming wave and information such as the distance between the source device and the measurement device. The back of the measurement device refers to the side toward which the back cover (rear) of the measurement device faces, with the back of the measurement device positioned opposite the front. It will be appreciated that during the angle-of-arrival measurement process, the front of the measurement device typically faces the user, while the back of the measurement device typically faces away from the user.

[0069] Figure 3 is a schematic diagram of an angle-of-arrival measurement setup, provided in another embodiment of the present application. As shown in Figure 3, during the angle-of-arrival measurement process, the measurement device remains essentially horizontal, meaning its screen is essentially parallel to the horizontal plane. Furthermore, the line containing antennas 1 and 2, used for angle-of-arrival measurement, also remains essentially horizontal. Consequently, antennas 1 and 2 can measure the angle of arrival of wireless signals originating from both the front and back of the measurement device.

[0070] It should be noted that, in this arrival angle measurement posture, as shown in FIG3 , the front of the measuring device refers to the area to which the top of the measuring device screen faces; the back of the measuring device refers to the area to which the bottom of the measuring device screen faces.

[0071] For ease of description, as shown in Figure 4, this embodiment uses θ to represent the angle of arrival of the wireless signal from the back of the measuring device, and uses -θ to represent 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 wireless signal 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 this.

[0072] FIG5 is a schematic diagram of the angle of arrival measurement principle provided by an embodiment of the present application. Referring to FIG5 , taking the measurement device using antenna 1 and antenna 2 to measure the angle of arrival of a wireless signal as an example, the measurement device can determine the angle of arrival of the wireless signal according to the following formula (1).

[0073] In formula (1), φ ant1 is the phase of the wireless signal received by antenna 1, φ ant2 is the phase of the wireless signal received by antenna 2, φ ant1 -φ ant2 is 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 is the arrival angle to be measured. λ is the wavelength of the wireless signal, which is usually known.

[0074] It can be understood that during the arrival angle measurement process, the measuring equipment obtains φ ant1 and φ ant2 Afterwards, φ ant1 and φ ant2 Substituting into formula (1) we can get the arrival angle θ of the wireless signal AoA .

[0075] However, referring to the cosine function f(θ AoA )=cosθ AoA It can be seen that cosθ AoA In the range of -180°~0° and 0°~180°, about θ AoA =0° symmetry, i.e. cosθ=cos(-θ). Therefore, by ant1 -φ ant2 Substituting the arrival angle determined by formula (1) can be either θ or -θ. In other words, the above method cannot distinguish whether the wireless signal is incident from the front or back of the measuring device, and the measurement result may have a large error.

[0076] To this end, an embodiment of the present application provides an arrival angle measurement method, which utilizes the difference in antenna radiation field patterns on the front and back of the measurement device to distinguish the direction of the wireless signal, thereby improving the accuracy of the arrival angle measurement.

[0077] Figures 7A and 7B are schematic diagrams of a measurement device applicable to the angle of arrival measurement method provided in an embodiment of the present application. As shown in the figure, the measurement device includes an angle of arrival measurement module, a first antenna, and a second antenna.

[0078] The angle-of-arrival measurement module connects 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 angle-of-arrival measurement module can be a UWB module, a Wi-Fi module, a BT module, or an RF module, etc., and this embodiment is not limited to this.

[0079] The first antenna is an omnidirectional antenna, and its antenna radiation pattern on the front and back of the measuring device is substantially the same. For example, the first antenna can be a frame antenna, and this embodiment does not limit the type of the first antenna.

[0080] For example, when the first antenna is a frame antenna, as shown in Figure 7A or Figure 7B, the first antenna includes an antenna radiator, a grounding point G, and a first feed point F1. The antenna radiator is used to transmit / receive wireless signals, is a part of the metal frame of the measuring device, and is located between two insulating breakpoints on the metal frame. The antenna radiator is connected to the grounding point G through a grounding line, and the grounding point G is connected to the ground plane of the printed circuit board (PCB) of the measuring device. In addition, the antenna radiator is also connected to the first feed point F1 through a feeding line, the first feed point F1 is connected to the arrival angle measurement module, and the RF source device feeds the antenna radiator through the first feed point F1.

[0081] The second antenna is a directional antenna, and its radiation pattern on the front and back of the measurement device differs significantly. For example, the second antenna can be a single-body patch antenna, a shared-body patch antenna, or the like. This embodiment does not limit the type of the second antenna.

[0082] For example, when the second antenna is a single-body patch antenna, as shown in Figure 7A , the second antenna includes an antenna radiator and a second feed point F2. The antenna radiator is a rectangular metal patch structure used to transmit and receive wireless signals, and is located on the side of the back cover of the measurement device facing the screen. The antenna radiator is connected to the second feed point F2 via a feeder circuit. The second feed point F2 is connected to the angle of arrival measurement module, and the RF signal source device feeds power to the antenna radiator through the second feed point F2.

[0083] Alternatively, when the second antenna is a common patch antenna, as shown in Figure 7B, 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, which is arranged on the side of the back cover of the measuring device facing the screen. The width of the metal patch is approximately 0.35λ and the length is approximately 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 feeding line to form a differential mode (DM) antenna. The maximum current area of ​​the antenna radiator is connected to the third feed point F3 to form 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.

[0084] As can be understood, in this shared antenna, the arrival angle measurement module controls whether the second antenna in use is a DM antenna or a CM antenna by switching the switch. Furthermore, although the DM and CM antennas share a common radiator, their isolation exceeds a threshold, minimizing their mutual influence and enabling normal operation.

[0085] It should be noted that in the above-mentioned frame antenna, single-body patch antenna and shared-body patch antenna, the ground line, feed line and other lines may include one or more other electronic components such as capacitors, inductors and resistors in addition to the energized wires. This embodiment does not limit the specific structure of the above-mentioned lines.

[0086] Although the above descriptions show the differences between the first antenna and the second antenna in terms of shape, structure, etc., the key difference between the two lies in the antenna radiation pattern. The antenna radiation patterns of the first antenna and the second antenna are described in detail below.

[0087] In this embodiment, antenna radiation patterns are used to describe the correspondence between the energy radiated by the antenna and various positions in space. The antenna radiation pattern is generally a three-dimensional structure centered on the antenna. It can be understood that for an ideal point source antenna, the energy radiated is the same in all directions and is uniformly attenuated at the same amplitude. Therefore, its antenna radiation pattern is close to spherical. However, in actual applications, due to factors such as the shape and size of the antenna radiator, and obstructions (such as the device housing, components inside the device), the energy radiated by the antenna in all directions may be the same in size and attenuation amplitude, or may be different. Therefore, the antenna radiation pattern in actual applications is usually irregular.

[0088] It is worth noting that, in this embodiment, the antenna radiation patterns of the first antenna and the second antenna must satisfy the following pattern state 1 or pattern state 2.

[0089] Field pattern state 1: The antenna radiation patterns of the first antenna and the second antenna on the back of the measurement device are basically the same, while the antenna radiation patterns on the front of the measurement device are quite different.

[0090] Field pattern state 2: The antenna radiation patterns of the first antenna and the second antenna on the front of the measurement device are basically the same, but the antenna radiation patterns on the back of the measurement device are quite different.

[0091] The fact that the antenna radiation patterns of the first antenna and the second antenna are substantially the same can be understood as follows: the antenna radiation patterns of the first antenna and the second antenna are similar; in other words, in most areas (for example, in areas above 70% or 80%), the energy radiated by the first antenna and the second antenna in the same direction and the attenuation conditions are substantially the same, that is, the difference in energy at the same position is less than a threshold.

[0092] In addition, the large difference in antenna radiation patterns between the first antenna and the second antenna can be understood as: the antenna radiation patterns of the first antenna and the second antenna are not similar; or, in other words, in most areas (for example, in areas above 70% or 80%), the energy and / or attenuation radiated by the first antenna and the second antenna in the same direction are significantly different, that is, the difference in energy at the same position is greater than a threshold.

[0093] Taking the field pattern state 1 as an example, the antenna radiation patterns of the first antenna and the second antenna are described below with reference to FIG8 and FIG9 respectively.

[0094] Figure 8 is the antenna radiation pattern of the first antenna and the second antenna provided in an embodiment of the present application. The antenna radiation pattern is used to represent the distribution of the energy radiated by the antenna with the angular coordinates at a fixed distance. Specifically, in the polar coordinate system shown in Figure 8, the polar diameter is used to represent the magnitude of the energy radiated by the antenna, and its unit is dBi (decibel gain); the polar angle is used to represent the orientation relative to the measuring device, which includes -180° to 180°; the closed curve in the figure is used to represent the energy at different orientations at a preset distance (such as 1m) from the antenna, showing the change of the energy radiated by the antenna with the orientation at this distance. In addition, taking the illustrated direction 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.

[0095] Regarding the first antenna, it can be seen from FIG8( a ) that, at a distance of 1 m from the measuring device, the antenna radiation patterns of the first antenna on the front and back of the measuring device are substantially symmetrical about the plane where the measuring device is located.

[0096] Taking A1 and A2 as examples, A1 is a point 1 meter from the first antenna in the -40° direction, and A2 is a point 1 meter from the first antenna in the 40° direction. A1 and A2 are symmetrical about the plane of the measurement equipment. As can be seen in Figure 8(a), the energy at the position corresponding to A1 is approximately -2dBi, and the energy at the position corresponding to A2 is approximately 0dBi. The difference of 2dBi between the two is less than the energy threshold (for example, 3dBi), and the energies at A1 and A2 are essentially the same.

[0097] Taking B1 and B2 as examples, B1 is a point 1 meter from the first antenna in the -60° direction, and B2 is a point 1 meter from the first antenna in the 60° direction. B1 and B2 are symmetrical about the plane of the measurement equipment. As can be seen in Figure 8(a), the energy at the position corresponding to B1 is approximately 0 dBi, and the energy at the position corresponding to B2 is also approximately 0 dBi. The difference of 0 dBi between the two is less than the energy threshold of 3 dBi, and the energies at B1 and B2 are also essentially the same.

[0098] Regarding the second antenna, as shown in Figure 8(b), at a distance of 1 meter from the measurement device, the second antenna's radiation patterns differ significantly from those at the front and back of the device. The energy radiated by the second antenna toward the front of the device is weaker, while the energy radiated toward the back is stronger.

[0099] Taking C1 and C2 as examples, C1 is a point 1 meter from the second antenna in the -40° direction, and C2 is a point 1 meter from the second antenna in the 40° direction. C1 and C2 are symmetrical about the plane of the measurement equipment. As shown in Figure 8(b), the energy at position C1 is approximately -11dBi, and the energy at position C2 is approximately -7dBi. The difference of 4dBi between the two is greater than the energy threshold of 3dBi, indicating a significant difference in energy between C1 and C2.

[0100] Taking D1 and D2 as examples, D1 is a point 1 meter from the second antenna in the -60° direction, and D2 is a point 1 meter from the second antenna in the 60° direction. D1 and D2 are symmetrical about the plane of the measurement equipment. As shown in Figure 8(b), the energy at D1 is approximately -13dBi, while the energy at C2 is approximately 4dBi. The difference between the two is a whopping 17dBi, far exceeding the energy threshold of 3dBi. The energy difference between D1 and D2 is also quite large.

[0101] In addition, a comprehensive comparison of (a) and (b) in FIG8 shows that, on the back of the measuring device, the antenna radiation patterns of the first antenna and the second antenna are basically the same; whereas, on the front of the measuring device, the antenna radiation patterns of the first antenna and the second antenna are quite different.

[0102] Figure 9 shows a three-dimensional antenna radiation pattern diagram of the first and second antennas provided in an embodiment of the present application. The darker the color of each pixel in the diagram, the stronger the energy at that pixel's corresponding location. Furthermore, using the diagram as an example, the left side of the plane where the measurement device resides is the front of the measurement device, and the right side of the plane where the measurement device resides is the back of the measurement device.

[0103] Regarding the first antenna, it can be seen from (a) in Figure 9 that the antenna radiation field 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 distribution of energy radiated by the first antenna to the front and back of the measuring device is basically the same.

[0104] Regarding the second antenna, as shown in Figure 9(b), the second antenna's radiation patterns differ significantly from those on the front and back of the measurement device. The energy radiated by the second antenna toward the front of the measurement device is weaker, while the energy radiated toward the back is stronger.

[0105] In addition, a comprehensive comparison of (a) and (b) in Figure 9 also shows that on the back of the measuring device, the antenna radiation patterns of the first antenna and the second antenna are basically the same; on the front of the measuring device, the antenna radiation patterns of the first antenna and the second antenna are quite different.

[0106] Generally speaking, the more energy an antenna radiates into the surrounding space, the better its reception of wireless signals. Therefore, the antenna's radiation pattern affects certain parameters related to wireless signals. For example, these parameters may include the power of the received wireless signal, the distance between the transmitting device and the measurement device, and so on. Furthermore, generally speaking, the greater the energy an antenna radiates into the surrounding space, the more accurate the measurement results of these parameters, such as power and distance, will be.

[0107] Based on this, it can be understood that, along the propagation path of the wireless signal, when the antenna radiation patterns of the first antenna and the second antenna of the measuring device are similar, the measurement results of the above-mentioned parameters such as power and distance by the first antenna and the second antenna are more similar. Conversely, when the antenna radiation patterns of the first antenna and the second antenna differ significantly, the measurement results of the above-mentioned parameters such as power and distance by the first antenna and the second antenna differ more significantly.

[0108] The following uses the distance measurement difference (i.e., ranging difference) between the first antenna and the second antenna in pattern state 1 as an example to illustrate how the difference in antenna radiation patterns affects some parameters.

[0109] Figure 10 shows a schematic diagram of the ranging difference between the first antenna and the second antenna according to an embodiment of the present application. The horizontal axis of the figure represents the ground truth value of the angle of arrival, and the vertical axis represents the ranging difference ΔD between the first antenna and the second antenna in field state 1, where ΔD = |D1-D2|, where 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.

[0110] Figure 10 shows that on the front of the measurement device, due to the significant difference in the radiation patterns of the first and second antennas, the ranging difference ΔD between the first and second antennas is large over most of the front range. For example, within the arrival angle range of -170° to -10°, ΔD is generally between 0.1m and 0.6m. On the back of the measurement device, however, due to the essentially identical radiation patterns of the first and second antennas, the ranging difference between the first and second antennas is relatively small over most of the back range, remaining generally less than 0.1m at all arrival angles.

[0111] Therefore, the measuring device can determine whether the wireless signal comes from the front or back of the measuring device based on whether the ranging difference ΔD between the first antenna and the second antenna is greater than a distance threshold (such as 0.1m, 0.15m, etc.). For example, for a measuring device that meets the ranging characteristics shown in Figure 10, its effective recognition range can cover -170° to -10° and 10° to 170°, and the measurement range is relatively large. Therefore, when the ranging difference ΔD between 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 measuring device; and when the ranging difference ΔD between 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 measuring device.

[0112] It should be noted that, under the condition that the antenna radiation pattern of the measuring device satisfies pattern state 2, that is, the antenna radiation patterns of the first antenna and the second antenna on the back of the measuring device are basically the same, while the antenna radiation patterns on the front of the measuring device are quite different, when the ranging difference ΔD between 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 measuring device; and when the ranging difference ΔD between 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 measuring device.

[0113] Similarly, because the antenna radiation pattern also affects the measured wireless signal power W, the power of the wireless signal measured by the first antenna and the second antenna is also different for the same wireless signal. Therefore, the measuring device can also determine the area where the wireless signal comes from based on the wireless signal power difference ΔW = |W1-W2|. Where W1 is the wireless signal power measured by the measuring device using the first antenna, and D2 is the wireless signal power measured by the measuring device using the second antenna.

[0114] Exemplarily, under the condition that the measuring device satisfies field type state 1, when the power difference ΔW between 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 measuring device; and when the power difference ΔW between 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 measuring device.

[0115] Alternatively, under the condition that the measuring device satisfies field state 2, when the power difference ΔW between 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 measuring device; and when the power difference ΔW between 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 measuring device.

[0116] It can be understood that since different areas around the measuring device correspond to different angle ranges, for example, the front of the measuring device corresponds to a first angle range (such as -180° to 0°), and the back corresponds to a second angle range (such as 0° to 180°); or, the back of the measuring device corresponds to the first angle range, and the front corresponds to the second angle range. This embodiment does not limit this. Therefore, the measuring device can identify the area from which the wireless signal comes. In other words, the measuring device can identify the arrival angle range of the wireless signal. Based on this, the measuring device can filter out the arrival angle that does not belong to the arrival angle range during the arrival angle measurement process, thereby improving the measurement accuracy of the arrival angle.

[0117] The following is a detailed description of the angle of arrival measurement process provided in the embodiments of the present application.

[0118] FIG11 is a schematic flow chart of an arrival angle measurement method provided in an embodiment of the present application. Referring to FIG11 , the method specifically includes the following steps S1101 to S1103.

[0119] S1101: A measuring device determines a difference in a target parameter measured according to a wireless signal using a first antenna and a second antenna.

[0120] In this embodiment, the target parameter is a parameter affected by the antenna radiation pattern, such as the distance between the measuring device and the signal source device, the power of the wireless signal received by the measuring device, etc.

[0121] Exemplarily, in S1101, the measuring device determines a difference between a target parameter measured by a first antenna and a second antenna based on wireless signals. This specifically includes: the measuring device uses the first antenna to determine a first measurement result of the target parameter based on the wireless signal; and simultaneously, the measuring device uses the second antenna to determine a second measurement result of the target parameter 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.

[0122] S1102: The measuring device determines the arrival angle range of the wireless signal based on the difference.

[0123] Based on the previous description, it can be seen that since the target parameter is affected by the antenna radiation field pattern on the propagation path, the field pattern difference between the first antenna and the second antenna on the propagation path of the wireless signal can be determined based on the size of the difference between the first measurement result and the second measurement result of the target parameter, and then the wireless signal can be determined from the front or back of the measuring device, that is, the arrival angle range of the wireless signal.

[0124] 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, it is determined that the wireless signal originates from a first angular range. Within this first angular range, the antenna radiation patterns of the first antenna and the second antenna differ significantly. It should be noted that, depending on the antenna configuration of the measuring device, this first angular range may be the back or front of the measuring device.

[0125] Alternatively, when the absolute value of the difference between the first measurement result and the second measurement result is less than a threshold, it is determined that the wireless signal originates from a second angular range. The first angular range and the second angular range are different, and within the second angular range, the antenna radiation patterns of the first antenna and the second antenna are substantially the same. Similarly, depending on the antenna configuration of the measuring device, the second angular range may be the front or back of the measuring device.

[0126] S1103: The measuring device determines the arrival angle of the wireless signal using the first antenna and the second antenna based on the arrival angle range of the wireless signal.

[0127] It can be understood that after determining the arrival angle range, the measuring device can further determine the arrival angle of the wireless signal within the arrival angle range, thereby improving the accuracy of the arrival angle measurement.

[0128] To summarize, through the method provided in the embodiments of the present application, the measuring device identifies whether the wireless signal comes from the front or the back based on the influence of the field pattern difference between the first antenna and the second antenna on the front and back sides on measurement parameters such as distance and power, and detects the wireless signal within a 360° range according to the parameter difference obtained by measuring using the first antenna and the second antenna, thereby improving the arrival angle measurement accuracy of the measuring device.

[0129] Taking the measurement device satisfying field type state 1 as an example, the following specifically describes two aspects involved in the embodiments of the present application: (1) determining the arrival angle range of the wireless signal, and (2) determining the arrival angle of the wireless signal based on the arrival angle range of the wireless signal.

[0130] (1) Determine the arrival angle range of wireless signals

[0131] For different antenna types, the measurement device can use different methods to determine the arrival angle range of wireless signals. The following describes the process of determining the arrival angle range of wireless signals, using different examples, taking as an example a measurement device with a first angle range (e.g., -180° to 0°) and a second angle range (e.g., 0° to 180°), with 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.

[0132] Example 1: The first antenna is a single frame antenna, and the second antenna is a single patch antenna.

[0133] As shown in Figure 7A, the first antenna of the measurement device is a single-frame antenna, and the second antenna is a single-patch antenna. The single-frame antenna and the single-patch antenna typically have only one radiation pattern each. Therefore, for a given wireless signal, the difference in the target parameter measured by the first and second antennas is definite. Based on this difference and the field pattern conditions satisfied by the measurement device, the measurement device can determine the arrival angle range of the wireless signal.

[0134] For example, if the measurement device meets field pattern state 1, when the difference in the target parameter measured by the first antenna and the second antenna is less than a threshold, it indicates that the antenna radiation patterns along the propagation path of the wireless signal are substantially the same when propagating toward the first antenna and the second antenna. Therefore, it is determined that the wireless signal originates from the back of the measurement device, i.e., the arrival angle range of the wireless signal is within the second angular range of 0 to 180°. If the difference in the target parameter measured by the first antenna and the second antenna is greater than or equal to the threshold, it indicates that the antenna radiation patterns along the propagation path of the wireless signal differ significantly when propagating toward the first antenna and the second antenna. Therefore, it is determined that the wireless signal originates from the front of the measurement device, i.e., the arrival angle range of the wireless signal is within the first angular range of -180° to 0°.

[0135] Example 2: The first antenna is a single-body frame antenna, and the second antenna is a co-body patch antenna.

[0136] As shown in Figure 7B , the first antenna of the measurement device is a single frame antenna, and the second antenna is a co-existing patch antenna. A single frame antenna typically has only one radiation pattern. However, a co-existing patch antenna actually includes two antennas: a DM antenna and a CM antenna. These two antennas have different radiation patterns. In other words, the second antenna effectively has two different radiation patterns.

[0137] Figure 12 is the antenna radiation pattern of the DM antenna and the CM antenna provided in the embodiment of the present application. Referring to Figure 12, it can be seen that the antenna radiation pattern of the DM antenna and the CM antenna on the front of the measuring device is basically the same, but there is a big difference in the antenna radiation pattern on the back of the measuring device. Moreover, on the back of the measuring device, the antenna radiation pattern of the DM antenna and the CM antenna can complement each other. For example, referring to (a) and (b) in Figure 12, in the range of 0° to 40° and 150° to 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° to 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.

[0138] If the radiation patterns of the DM and CM antennas differ, there will also be certain differences when determining measurement parameters such as distance and power compared to the first antenna. The details are as follows.

[0139] Figure 13A 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, within the effective measurement range of -160° to -20°, the ranging difference between the first antenna and the DM antenna is less than the threshold at -130° to -120° and -100° to -90°, and cannot accurately reflect the field pattern difference between the first antenna and the DM antenna. However, within the remaining angle range, the ranging difference is greater than or equal to the distance threshold, and can accurately reflect the field pattern difference between the first antenna and the DM antenna. Furthermore, within the effective measurement range of -160° to -20°, the ranging difference between the first antenna and the CM antenna is less than the threshold near -120° to -110° and -85° to -75°, failing to accurately reflect the difference in field patterns between the first and CM antennas. However, within the remaining angle range, the ranging difference is greater than or equal to the distance threshold, accurately reflecting the difference in field patterns between the first and CM antennas. This indicates that the angular ranges within which the ranging difference between the DM and CM antennas fails to reflect the field pattern difference are different. Therefore, the measurement device can use a combination of DM and CM antennas to identify the difference in radiation patterns between the second antenna and the second antenna, thereby determining the angular range of arrival of the wireless signal.

[0140] In one possible implementation, for the target parameter, the measurement device can use the DM antenna and the first antenna to measure to obtain a difference value, and use the CM antenna combined with the first antenna to measure to obtain another difference value. The complementary characteristics of the field patterns of the DM antenna and the CM antenna are utilized to jointly determine the arrival angle range of the wireless signal based on these two differences, thereby improving the accuracy of the arrival angle range.

[0141] Taking the target parameter as the distance between the measuring device and the source device, the measuring device can calculate the distance difference ΔD between the first antenna and the DM antenna. DM , and the ranging difference ΔD between the first antenna and the CM antenna CM The fusion process is performed to obtain ΔD, so that the ΔD accurately reflects the difference in field patterns between the first antenna and the second antenna.

[0142] In this embodiment, ΔD DM and ΔD CM The fusion process includes: ΔD under the same arrival angle DM and ΔD CM Add up to get ΔD under the arrival angle, that is, the ranging difference ΔD = ΔD DM +ΔD CM Alternatively, ΔD at the same arrival angle CM and ΔD DM The average value of is determined as ΔD under the arrival angle, that is, the ranging difference ΔD=(ΔD DM +ΔD CM) / 2; or, ΔD under the same arrival angle DM and ΔD CM The maximum value in is determined as ΔD under the arrival angle, that is, the ranging difference ΔD=max(ΔD DM ,ΔD CM ).

[0143] FIG13B is a schematic diagram of the ranging difference after fusion processing provided by an embodiment of the present application, in which the ranging difference ΔD between the first antenna and the second antenna is equal to max(ΔD DM ,ΔD CM As shown in the figure, within the arrival angle range of -160° to -20°, the ranging difference ΔD between the first antenna and the second antenna is greater than the distance threshold, accurately reflecting the difference in field patterns between the first antenna and the second antenna, and facilitating accurate determination of the arrival angle range of the wireless signal. To this end, in this embodiment, the measuring device may first determine the ranging difference ΔD between the first antenna and the second antenna, and then determine the arrival angle range of the wireless signal based on whether the ranging difference ΔD is greater than the distance threshold.

[0144] FIG14 is a flowchart of determining an arrival angle range according to an embodiment of the present application, which specifically includes the following steps S1401 to S1406.

[0145] S1401: The measuring device switches the second antenna to a DM antenna.

[0146] Specifically, taking the measurement device shown in FIG. 7B as an example, the measurement device can control the switch to connect the feed point F2 through the arrival angle measurement module, thereby switching the second antenna to the DM state, that is, switching the second antenna to a DM antenna.

[0147] S1402: The measuring device determines a first difference ΔD between the distances measured by the first antenna and the DM antenna. DM .

[0148] In this embodiment, the measuring device can measure the distance A between the source device and the measuring device through the first antenna based on UWB ranging or other methods, and measure the distance B between the source device and the measuring device through the CM antenna. It can be understood that the difference between the distance A and the distance B is the first difference ΔD DM .

[0149] S1403: The measuring device switches the second antenna to the CM antenna.

[0150] Similarly, taking the measurement device shown in FIG7B as an example, the measurement device can control the switch to connect the feed point F3 through the arrival angle measurement module, thereby switching the second antenna to the CM state, that is, switching the second antenna to a CM antenna.

[0151] S1404: The measuring device determines a second difference ΔD between the distances measured by the first antenna and the CM antenna. CM .

[0152] Similarly, in this embodiment, the measuring device can also measure the distance C between the source device and the measuring device through the first antenna based on UWB ranging or other methods, and measure the distance D between the source device and the measuring device through the CM antenna. It can be understood that the difference between the distance C and the distance D is the second difference ΔD CM .

[0153] S1405, the measuring device determines ΔD DM and ΔD CM The maximum value max(ΔD DM ,ΔD CM ).

[0154] S1406, the measuring device is based on max(ΔD DM ,ΔD CM ) and the field pattern status of the measuring equipment to determine the arrival angle range of the wireless signal.

[0155] Taking the first antenna and the second antenna satisfying the field pattern state 1 as an example, when max(ΔD DM ,ΔD CM ) is less than the distance threshold, it means that when the wireless signal propagates to the first antenna and the second antenna, the antenna radiation pattern on the propagation path is basically the same. The wireless signal comes from the back of the measuring device and its arrival angle range is 0 to 180°. When max(ΔD DM ,ΔD CM ) is greater than or equal to the distance threshold, it indicates that when the wireless signal propagates toward the first antenna and the second antenna, the antenna radiation patterns on the propagation path are significantly different, and the wireless signal comes from the front of the measuring device, and its arrival angle range is -180° to 0°.

[0156] (2) Determining the arrival angle of the wireless signal based on the arrival angle range of the wireless signal

[0157] The phase difference φ of the wireless signal is usually preset in the measurement equipment ant1 -φ ant2 The correspondence between the angle of arrival and the true value of the angle of arrival is obtained by the developer through measurement of the measuring device in a measurement environment such as a laboratory. It can be understood that for each measuring device, this correspondence is usually fixed. Therefore, when the measuring device detects the measured value φ of the phase difference between the wireless signal received by the first antenna and the second antenna ant1 -φ ant2 Afterwards, we can determine φ ant1 -φ ant2The correlation between the true value of the phase difference at different arrival angles is calculated, and the arrival angle of the wireless signal is determined based on the correlation.

[0158] FIG15 is a schematic diagram of the correlation of phase difference provided by an embodiment of the present application. The horizontal axis in the figure is the true value of the angle of arrival, and the first angle range of -180° to 0° corresponds to the front of the measuring device, and the second angle range of 0° to 180° is located on the back of the measuring device. The vertical axis in the figure is the correlation between the measured value and the true value of the phase difference at different angles of arrival. The larger the correlation value, the higher the possibility that the corresponding angle of arrival is the true 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 two wireless signals with an arrival angle of θ and -θ is basically the same, and the correlation between this phase difference and the true value of the phase difference at θ and -θ may be large, resulting in inaccurate angle of arrival measurement results. For example, as shown in FIG15, the correlation corresponding to the arrival angles of -110° and 110° are both large. Therefore, -110° and 110° may both be the angle of arrival of the wireless signal, resulting in inaccurate angle of arrival measurement results.

[0159] Therefore, in this embodiment, after determining the arrival angle range of the wireless signal, the measuring device can determine the measured value of the arrival angle by combining the correlation of the phase differences of different arrival angles within the arrival angle range.

[0160] For example, when the angle of arrival of a wireless signal ranges from -180° to 0°, the measurement device can determine the correlation between the measured phase difference of the wireless signal and the true phase difference at different angles of arrival within the range, and determine the angle of arrival of the wireless signal based on this correlation. Taking the correlation shown in Figure 15 as an example, based on the maximum correlation in Figure 15, the measurement device can determine that the angle of arrival of the wireless signal within the range of -180° to 0° is -110°, thereby improving the accuracy of the measurement device's angle of arrival measurement.

[0161] When determining the angle of arrival of a wireless signal based on the angle of arrival range of the wireless signal, the measurement device may first determine the angle of arrival range of the wireless signal and then perform angle of arrival measurement within the angle of arrival range. Alternatively, the measurement device may first perform angle of arrival measurement and determine multiple candidate angles of arrival, then determine the angle of arrival range of the wireless signal and filter the candidate angles of arrival based on the angle of arrival range to determine the final angle of arrival. For details, see Examples 1 and 2 below.

[0162] Example 1: The measuring device first determines the arrival angle range of the wireless signal, and then performs arrival angle measurement within the arrival angle range.

[0163] FIG16 is a schematic diagram of an arrival angle measurement process provided by an embodiment of the present application, which specifically includes the following steps S1601 to S1604.

[0164] S1601: The measuring device determines the arrival angle range of the wireless signal. For details, refer to the above and will not be repeated here.

[0165] S1602: The measuring device determines a measured value of a phase difference between wireless signals received by the first antenna and the second antenna.

[0166] S1603: The measuring device determines, within the arrival angle range, the correlation between the measured value of the phase difference and the true value of the phase difference at different arrival angles.

[0167] For example, when the wireless signal comes from the front of the measuring device and its arrival angle range is -180° to 0°, the measured value of the phase difference φ ant1 -φ ant2 The correlation with the true value of each phase difference of the wireless signal in the range of -180° to 0° is shown in FIG17 .

[0168] It should be noted that, in this embodiment, the measuring device does not need the correlation between the measured value and the true value of the phase difference in the range of 0° to 180°, which can reduce the amount of calculation of the measuring device and improve the measurement rate of the arrival angle.

[0169] S1604: The measuring device determines the arrival angle of the wireless signal based on the correlation.

[0170] In some embodiments, the measurement device may determine the angle of arrival with the highest phase difference correlation as the angle of arrival of the wireless signal. For example, the correlation diagram shown in FIG17 shows that the phase difference correlation is highest at an angle of arrival of -110°. Therefore, -110° is determined as the angle of arrival of the wireless signal.

[0171] In Example 2, the measuring device first determines multiple candidate angles of arrival, and then filters the candidate angles of arrival according to the range of the angles of arrival of the wireless signal, thereby determining a final angle of arrival.

[0172] FIG18 is a schematic diagram of an arrival angle measurement process provided by another embodiment of the present application, which specifically includes the following steps S1801 to S1805.

[0173] S1801: A measuring device determines a measured value of a phase difference between wireless signals received by a first antenna and a second antenna.

[0174] It should be noted that, when the second antenna is a co-existing antenna, the measured value of the phase difference may 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.

[0175] 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 arrival angle within the range of -180° to 180°.

[0176] In one embodiment, the correlation between the measured value of the phase difference and the true value of each phase difference of the wireless signal within the range of -180° to 180° is shown in FIG15 .

[0177] S1803: The measuring device determines a candidate arrival angle of the wireless signal based on the correlation.

[0178] Taking the correlation diagram shown in FIG15 as an example, the measuring device may determine multiple arrival angles with high correlation, such as −110° and 110°, as candidate arrival angles of the wireless signal.

[0179] S1804: The measuring device determines the arrival angle range of the wireless signal. For details, refer to the above and will not be repeated here.

[0180] S1805: The measuring device determines the candidate arrival angles within the arrival angle range as the arrival angles of the wireless signal.

[0181] Taking the arrival angle range of the wireless signal as -180° to 0° and the candidate arrival angles including -110° and 110° as an example, the measurement device can determine -110° within the arrival angle range of -180° to 0° as the arrival angle of the wireless signal.

[0182] In this embodiment, after determining that the angle of arrival of the wireless signal is -110°, the measuring device may display direction indication information, such as that shown in Figure 19, to indicate the direction of the wireless signal to the user. It will be understood that the direction of the wireless signal also represents the direction of the source device relative to the measuring device. Furthermore, the measuring device may also measure the distance between the device and the source device of the wireless signal, such as a distance of 11 meters.

[0183] In summary, through 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.

[0184] However, in some special cases, such as shown in Figure 20(a), the measured phase difference has a high correlation with the true value at multiple arrival angles of -178°, -135°, -60°, -18°, and 50°. Based on this, as shown in Figure 20(b), even if the measurement device uses the above method to identify the wireless signal as coming from the back and narrows the range of possible arrival angles to -180° to 0°, it can only eliminate the angle of 50° and cannot accurately determine the arrival angles of -178°, -135°, -60°, and -18°.

[0185] Therefore, to further improve the accuracy of the angle of arrival measurement results, the measurement device can also be combined with a rotation operation to further determine the angle of arrival. The following describes an exemplary method for angle of arrival measurement with reference to the measurement device shown in FIG7A . It should be understood that the angle of arrival measurement method provided in this embodiment can also be applied to a measurement device including a co-body antenna, such as that shown in FIG7B .

[0186] FIG21 is a schematic flow chart of an arrival angle measurement method provided in another embodiment of the present application. Referring to FIG21 , the method includes the following steps S2101 to S2106.

[0187] S2101: The measuring device displays prompt information, where the prompt information is used to prompt the user to change the posture of the measuring device.

[0188] In some embodiments, the measuring device may display a rotation prompt icon as shown in FIG22 to prompt the user to rotate the phone left or right. Alternatively, the measuring device may display prompt text such as "Keep the phone upright and slowly turn the phone left or right" to prompt the user to rotate the phone left or right.

[0189] S2102: The measuring device determines the arrival angle range of the wireless signal. For details, refer to the above and will not be repeated here.

[0190] It should be noted that this embodiment does not limit the execution order of S2101 and S2102. In other words, the measuring device may execute S2101 first and then S2102, or may execute S2102 first and then S2101.

[0191] S2103 , the measuring device determines the measured values ​​of the phase difference of the wireless signal at multiple different moments in the process of changing the posture.

[0192] For example, the measuring device may determine the phase difference of the wireless signal at times T1, T2, and T3, respectively.

[0193] S2104: The measuring device determines, within the range of the arrival angle of the wireless signal, the correlation between the measured values ​​of the phase differences of the wireless signal at the multiple different moments and the true values ​​of the phase differences at different arrival angles.

[0194] For example, when the angle of arrival of a wireless signal ranges from -180° to 0°, the correlations between the measured and true phase difference values ​​at times T1, T2, and T3 are shown in Figure 23 (a), (b), and (c), respectively. As can be seen from the figures, at times T1, T2, and T3, there are multiple points with high phase difference correlation. Therefore, measurement equipment typically cannot accurately identify the angle of arrival of wireless signals based solely on the correlations at these individual times.

[0195] In view of this, this embodiment fuses the correlation between the measured values ​​and the true values ​​of the wireless signal phase differences at multiple different times, and determines the arrival angle of the wireless signal based on the fused phase differences. For details, see S2105 to S2106.

[0196] S2105: The measuring device fuses the correlations of the phase differences of the wireless signals at multiple different moments to obtain a fused correlation.

[0197] In this embodiment, the measurement device fuses the correlations at multiple different times, including: The measurement device adds the correlations for the same arrival angle at multiple different times to obtain a fused correlation. For example, the correlations for the same arrival angle at times T1, T2, and T3 are added to obtain the correlation shown in (d) of Figure 23 .

[0198] It should be noted that this embodiment does not limit the fusion processing method. For example, the measurement device may also determine the average value of the correlation of the same arrival angle at multiple different times, and use the average value as the fused correlation.

[0199] S2106: The measuring device determines the arrival angle of the wireless signal based on the fused correlation.

[0200] For example, the measurement device may determine the angle of arrival corresponding to the maximum correlation as the angle of arrival of the wireless signal. Taking the correlation diagram shown in (d) of Figure 23 as an example, the measurement device may determine the angle of arrival corresponding to the maximum correlation -60° as the angle of arrival of the wireless signal.

[0201] In addition, in this embodiment, after determining that the angle of arrival of the wireless signal is -60°, the measuring device can display direction indication information, such as that shown in FIG24 , to indicate the direction from which the wireless signal originates to the user. Furthermore, the measuring device can also measure the distance between the device and the source device of the wireless signal, for example, a distance of 5 meters.

[0202] Figure 25 is a schematic diagram of the arrival angle measurement error provided by an embodiment of the present application. The horizontal axis in the figure is the true value of the arrival angle, and the vertical axis is the measurement error of the arrival angle, which is the difference between the true value and the measured value of the arrival angle. It can be seen that within the measurement angle range (field of view, FOV) of -120° to -50° and 40° to 150°, the absolute value of the average measurement error of the arrival angle is less than 10°. In other words, through the method provided in this embodiment, the measurement result of the arrival angle is relatively accurate.

[0203] In summary, through the method provided in the embodiments of the present application, the measuring device can improve the accuracy of arrival angle measurement by rotating the mobile phone to assist in angle measurement.

[0204] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0205] 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 aforementioned method embodiments. For ease of reading, the details of the aforementioned method embodiments will not be repeated here one by one, but it should be clear that each solution in this embodiment can correspond to the implementation of all the contents in the aforementioned method embodiments.

[0206] An embodiment of the present application also provides a chip, as shown in Figure 26, which includes a processor and a memory. The memory stores a computer program, and when the computer program is executed by the processor, the arrival angle measurement method provided in the above embodiments is implemented.

[0207] An embodiment of the present application further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the arrival angle measurement method shown in the above embodiments is implemented.

[0208] An embodiment of the present application further provides a computer program product, which includes a computer program. When the computer program is executed by an electronic device, the electronic device implements the arrival angle measurement method shown in the above embodiments.

[0209] It should be understood that the processor mentioned in the embodiments of the present application may be a central processing unit (CPU), or may 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 gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc.

[0210] It should also be understood that the memory mentioned in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM).

[0211] In the embodiments provided in this application, the division of each framework or module is merely a logical function division. In actual implementation, there may be other division methods, for example, multiple frameworks or modules can be combined or integrated into another system, or some features can be ignored or not executed.

[0212] In addition, the functional modules in the various embodiments of the present application may be integrated into a processing module, or each module may exist physically separately, or two or more modules may be integrated into a single module. The above-mentioned integrated modules may be implemented in the form of hardware or software functional modules.

[0213] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0214] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0215] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A method for measuring an angle of arrival, characterized in that: Applied to an electronic device, the electronic device includes a first antenna and a second antenna; antenna radiation 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 includes: Determine a difference in a target parameter measured according to a wireless signal using the first antenna and the second antenna; Determine, according to the difference, an arrival angle range of the wireless signal; wherein the arrival angle range is the first angle range or the second angle range; The angle of arrival of the wireless signal is measured using the first antenna and the second antenna according to the angle of arrival range.

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

3. The method according to claim 1 or 2, characterized in that: The first angle range corresponds to the back side of the electronic device, and the second angle range corresponds to the 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; Among them, 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 a source device to the electronic device, and 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 4, characterized in that: The determining a difference in a target parameter measured by using the first antenna and the second antenna according to the wireless signal includes: Using the first antenna, determining a first measurement result of the target parameter according to the wireless signal; Using the second antenna, determining a second measurement result of the target parameter according to the wireless signal; An absolute value of a difference between the first measurement result and the second measurement result is determined as a difference between target parameters measured by the first antenna and the second antenna.

6. The method according to any one of claims 1 to 5, characterized in that: The second antenna is a co-body antenna, and the co-body antenna includes a differential mode DM antenna and a common mode CM antenna; accordingly, determining the difference between the target parameters measured by the first antenna and the second antenna according to the wireless signal includes: Determine a first difference value of a target parameter measured by the first antenna and the DM antenna according to the wireless signal; Determine a second difference between the target parameter measured by the second antenna and the CM antenna according to the wireless signal; A difference between the target parameter measured using the first antenna and the second antenna is determined according to the first difference and the second difference.

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

8. The method according to any one of claims 1 to 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 8, characterized in that: Measuring the angle of arrival of the wireless signal using the first antenna and the second antenna according to the angle of arrival range includes: During the rotation of the electronic device, determining, within the range of the angle of arrival, 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; Performing fusion processing on the correlations at the multiple different moments to obtain fused correlations; The arrival angle of the wireless signal is determined according to the fused correlation.

10. The method according to claim 9, characterized in that The determining the arrival angle of the wireless signal according to the fused correlation includes: determining a maximum value among the fused correlations; 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 10, characterized in that: The sum of the first angle range and the second angle range covers 360° around the electronic device.

12. An electronic device, characterized in that: It comprises a first antenna and a second antenna; the antenna radiation 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 electronic device is configured to execute 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, and when the computer program is executed by a processor, the method according to any one of claims 1 to 11 is implemented.

14. A chip, characterized in that: The method comprises a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the method according to any one of claims 1 to 11 is implemented.

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