CN112098928A - Method, device, server and computer readable storage medium for determining contacter - Google Patents
Method, device, server and computer readable storage medium for determining contacter Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/80—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic or infrasonic waves
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Abstract
The embodiment of the invention discloses a method, a device, a server and a computer readable storage medium for determining a contacter. The method is applicable to a first intelligent device and comprises the following steps: receiving, from a second smart device, an ultrasound signal containing an identification of the second smart device; analyzing the identification of the second intelligent device from the ultrasonic signal; and when a preset reporting condition is met, sending reporting information containing the identifier of the second intelligent device to a server, wherein the server determines the user corresponding to the identifier of the second intelligent device as a contact person of the user of the first intelligent device. The embodiment of the invention realizes automatic determination of the contacter, and can also determine the key contacter based on the relative angle.
Description
Technical Field
The embodiment of the invention relates to the technical field of positioning, in particular to a method, a device, a server and a computer-readable storage medium for determining a contacter.
Background
In epidemic prevention and control, finding a contacter of an infected person is a key link, and timely screening is helpful for controlling disease spread. Traditional contacter tracking relies primarily on manual interrogation. Medical workers or public health departments attempt to learn the travel history, flow paths, and vehicles that have been taken for each diagnosed patient in an effort to find contacters with infected persons.
However, manual interrogation has the disadvantages of inaccuracy and inefficiency.
Disclosure of Invention
The embodiment of the invention provides a method, a device, a server and a computer readable storage medium for determining a contacter.
The technical scheme of the embodiment of the invention is as follows:
a method of determining a contacter, the method being applicable to a first smart device, the method comprising:
receiving, from a second smart device, an ultrasound signal containing an identification of the second smart device;
analyzing the identification of the second intelligent device from the ultrasonic signal;
and when a preset reporting condition is met, sending reporting information containing the identifier of the second intelligent device to a server, wherein the server determines the user corresponding to the identifier of the second intelligent device as a contact person of the user of the first intelligent device.
In one embodiment, the identification of the second smart device includes a media access control address, an international mobile subscriber identity, or an international mobile equipment identity of the second smart device.
In one embodiment, the second smart device sends the ultrasonic signal according to a predetermined period, and the first smart device records each time of receiving the ultrasonic signal, and further includes the each time of receiving in the report information;
the server determines the continuous contact time of the user of the first intelligent device and the user of the second intelligent device based on each receiving moment, and determines the user of the second intelligent device as a key contacter when the continuous contact time is larger than a preset threshold value.
In one embodiment, the first smart device includes a first sound detection module and a second sound detection module; the second intelligent device sends the ultrasonic signals according to a preset period;
the method further comprises the following steps: determining a time difference between a reception time of a first ultrasonic signal that is direct to the first sound detection module and a reception time of a second ultrasonic signal that is direct to the second sound detection module; determining a relative angle between the first smart device and the second smart device based on a distance between the first sound detection module and the second sound detection module and the time difference; wherein the first ultrasound signal and the second ultrasound signal are contained in ultrasound signals transmitted by a second smart device at the same point in time; the reporting information further comprises the relative angle; wherein the user of the second smart device is determined to be a key contacter when the server determines that the relative angle is within a predetermined angle range.
An apparatus for determining a contacter, the apparatus being adapted for use with a first smart device, the apparatus comprising:
a receiving module for receiving an ultrasound signal from a second smart device containing an identification of the second smart device;
the analysis module is used for analyzing the identifier of the second intelligent device from the ultrasonic signal;
and the reporting module is used for sending reporting information containing the identifier of the second intelligent device to a server when a preset reporting condition is met, wherein the server determines the user corresponding to the identifier of the second intelligent device as a contact person of the user of the first intelligent device.
In one embodiment, the identification of the second smart device includes a media access control address, an international mobile subscriber identity, or an international mobile equipment identity of the second smart device.
In one embodiment, wherein the second smart device transmits the ultrasound signal according to a predetermined period;
a reporting module, configured to record each time of receiving the ultrasonic signal, and further include the each time of receiving in the reporting information;
the server determines the continuous contact time of the user of the first intelligent device and the user of the second intelligent device based on each receiving moment, and determines the user of the second intelligent device as a key contacter when the continuous contact time is larger than a preset threshold value.
In one embodiment, the receiving module includes a first sound detection module and a second sound detection module; the second intelligent device sends the ultrasonic signals according to a preset period;
the reporting module is further configured to determine a time difference between a receiving time of a first ultrasonic signal that directly reaches the first sound detection module and a receiving time of a second ultrasonic signal that directly reaches the second sound detection module; determining a relative angle between the first smart device and the second smart device based on a distance between the first sound detection module and the second sound detection module and the time difference; wherein the first ultrasound signal and the second ultrasound signal are contained in ultrasound signals transmitted by a second smart device at the same point in time; the reporting information further comprises the relative angle;
wherein the user of the second smart device is determined to be a key contacter when the server determines that the relative angle is within a predetermined angle range.
A server, comprising: the receiving module is used for receiving reporting information from the first intelligent equipment, wherein the reporting information comprises an identifier of the second intelligent equipment; the first intelligent device receives an ultrasonic signal containing an identifier of the second intelligent device from the second intelligent device, analyzes the identifier of the second intelligent device from the ultrasonic signal, and sends the report information to a server when a preset report condition is met; a determination module to determine a user corresponding to the identification of the second smart device as a contacter of the user of the first smart device.
A computer readable storage medium having computer readable instructions stored therein for performing the method of determining a contacter of any one of the above.
According to the technical scheme, the embodiment of the invention realizes automatic determination of the contacter. Furthermore, the important contact person can be determined by further combining angle identification.
Drawings
Fig. 1 is an exemplary flowchart of a method for determining a relative angle between smart devices according to the present invention.
Fig. 2 is a schematic diagram illustrating the principle of relative angle determination between smart devices according to the present invention.
FIG. 3 is a schematic diagram of the calculation of relative angles between smart devices according to the present invention.
Fig. 4 is a first exemplary diagram of determining a pair of direct signals according to the present invention.
Fig. 5 is a second exemplary diagram illustrating the determination of a pair of direct signals according to the present invention.
Fig. 6 is a schematic diagram of a first exemplary arrangement of a first sound detection module and a second sound detection module in a smart device according to the present invention.
Fig. 7 is a schematic diagram of a second exemplary arrangement of a first sound detection module and a second sound detection module in a smart device according to the present invention.
Fig. 8 is a schematic diagram of the relative positioning of a first smart device and a second smart device in accordance with the present invention.
FIG. 9 is a schematic diagram showing relative angles in a smart device interface according to the present invention.
FIG. 10 is a flowchart illustrating an exemplary process for relative positioning between smart devices according to the present invention.
FIG. 11 is a flow chart of a method for determining a contacter in accordance with the present invention.
FIG. 12 is a schematic illustration of determining a duration in accordance with the present invention.
FIG. 13 is a block diagram of a system for determining a contacter in accordance with the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the accompanying drawings.
In order to realize the relative direction positioning between the intelligent devices by using software without additionally adding hardware, so that the relative positioning has universality, the devices of different manufacturers can realize interoperation and mutual compatibility, and the innovative application of the intelligent devices is explored on the basis of the interoperation and the compatibility, the embodiment of the invention provides a sound (preferably ultrasonic) based relative direction identification scheme between the intelligent devices, the hardware is not required to be additionally added, the software can be used for realizing the relative direction identification between the two intelligent devices, and the positioning result is accurate and reliable.
First, an intelligent device (intelligent device) refers to any device, apparatus or machine having computing processing capabilities. Fig. 1 is an exemplary flowchart of a method for determining a relative angle between smart devices according to the present invention. The method is applicable to a first intelligent device which comprises a first sound detection module and a second sound detection module. The first sound detection module and the second sound detection module are fixedly installed in the first intelligent device. For example, the first sound detection module may be implemented as one microphone or a set of microphone arrays arranged in the first smart device. Likewise, the second sound detection module may be implemented as one microphone or a set of microphone arrays arranged in the first smart device different from the first sound detection module.
As shown in fig. 1, the method includes:
step 101: enabling the first sound detection module to detect a first sound signal sent by the second intelligent device and directly reaching the first sound detection module, and enabling the second sound detection module to detect a second sound signal sent by the second intelligent device and directly reaching the second sound detection module, wherein the first sound signal and the second sound signal are sent by the second intelligent device at the same time.
Here, the second smart device may emit one sound signal or emit a plurality of sound signals at the same time.
Such as: when the second intelligent device sends out a sound signal, the first sound detection module and the second sound detection module in the second intelligent device respectively detect the sound signal. Wherein: the detection signal, which is detected by the first sound detection module and is directly transmitted to the first sound detection module, is determined as a first sound signal; the detection signal detected by the second sound detection module, which is the sound signal that reaches the first sound detection module, is determined as the second sound signal. For another example, when the second smart device emits multiple sound signals simultaneously, such as an ultrasonic signal and an audible sound signal. A first sound detection module in the second smart device is adapted to detect ultrasonic signals and a second sound detection module is adapted to detect audible sound signals. The first sound detection module detects the ultrasonic signal, and the second sound detection module detects the audible sound signal. Wherein: the detection signal, which is detected by the first sound detection module and through which the ultrasonic signal reaches the first sound detection module, is determined as a first sound signal; the detection signal detected by the second sound detection module, at which the audible sound signal reaches the second sound detection module, is determined to be a second sound signal.
In other words, the first sound signal and the second sound signal may be respective detection signals of the first sound detection module and the second sound detection module for the same sound signal emitted by the second smart device. Or, the first sound signal and the second sound signal may be respective detection signals of different sound signals emitted by the first sound detection module and the second sound detection module simultaneously for the second smart device.
Step 102: a time difference between the moment of reception of the first sound signal and the moment of reception of the second sound signal is determined.
Here, the first smart device (e.g., a CPU in the first smart device) may record the reception timing of the first sound signal and the reception timing of the second sound signal, and calculate a time difference between the two.
Step 103: and determining a relative angle between the first intelligent device and the second intelligent device based on the distance between the first sound detection module and the second sound detection module and the time difference.
For example, step 103 may be performed by the CPU of the first smart device. In one embodiment, determining the relative angle between the first smart device and the second smart device in step 103 includes: based on
Determining theta; wherein arcsin is an arcsine function, D is t × c, t is the time difference, c is the propagation speed of sound, and D is the distance between the first sound detection module and the second sound detection module; determining a first smart device and a second smart device based on thetaRelative angle between two intelligent devices
Wherein
The value of the time difference determined in step 102 may be a positive number or a negative number. When the value of the time difference is positive, the receiving time of the second sound signal is earlier than the receiving time of the first sound signal, so that the relative angle phi between the first intelligent device and the second intelligent device is generally an acute angle; when the value of the time difference is negative, the receiving time of the first sound signal is earlier than the receiving time of the second sound signal, so the relative angle phi between the first smart device and the second smart device is generally obtuse.
In an embodiment of the present invention, the first sound signal is a signal that is directly transmitted to the first sound detection module from the second smart device, and the second sound signal is a signal that is directly transmitted to the second sound detection module from the second smart device. In fact, either the first sound detection module or the second sound detection module may receive a signal that is emitted from the second smart device and is not direct (e.g., a reflection or multiple emissions past an obstacle). Therefore, how to determine the direct signal from the received multiple signals has a significant meaning.
The applicant found that: typically, the received signal stream (steam) of each sound detection module comprises a direct channel and a reflected channel. The direct channel can be determined simply and conveniently according to the following principle: the signal strength of the direct channel is typically strongest among all the signals detected by the sound detection module. Thus, in one embodiment, the method further comprises: the method comprises the steps that a first sound detection module receives sound signals with the intensity larger than a preset threshold value in a preset time window in sound signal streams of second intelligent equipment, and the sound signals are determined to be the first sound signals; and determining that the sound signal with the intensity larger than the preset threshold value in the preset time window in the sound signal stream of the second intelligent device is received by the second sound detection module as the second sound signal.
Fig. 4 is a first exemplary diagram of determining a pair of direct signals according to the present invention. In fig. 4, the sound signal stream detected by the first sound detection module is steam1, the steam1 contains a plurality of pulse signals varying along time (T), and the threshold value of the predetermined signal strength is T. It can be seen that the signal strength of the pulse signal 50 in steam1 is greater than the threshold value T over the range of time window 90. The sound signal stream detected by the second sound detection module is steam2, the steam2 contains a plurality of pulse signals varying along time (T), and the threshold value of the predetermined signal strength is also T. It can be seen that the signal strength of the pulse signal 60 in steam2 is greater than the threshold value T over the range of time window 90. Thus, the pulse signal 50 is determined to be the first sound signal; the pulse signal 60 is a second sound signal.
In addition, the applicant has also found that: the direct channel can be accurately determined by comprehensively considering the following two principles: principle (1), among all signals detected by the sound detection module, the signal strength of the direct channel is generally strongest; principle (2), joint discrimination: the distance difference d converted from the arrival time difference of two direct channel signals (the first sound signal and the second sound signal) should not be larger than the distance between the first sound detection module and the second sound detection module. Thus, in one embodiment, the method further comprises: determining sound signals with the intensity larger than a preset threshold value in a sound signal stream of second intelligent equipment detected by a first sound detection module to form a first candidate signal set; determining sound signals with the intensity larger than the preset threshold value in the sound signal flow of the second intelligent device detected by the second sound detection module to form a second candidate signal set; determining a respective time difference between a time of receipt of each sound signal in the first candidate signal set and a time of receipt of each sound signal in the second candidate signal set; and determining a pair of sound signals with the time difference smaller than M as the first sound signal and the second sound signal, wherein M is (D/c), D is the distance between the first sound detection module and the second sound detection module, and c is the propagation speed of sound.
Fig. 5 is a second exemplary diagram illustrating the determination of a pair of direct signals according to the present invention. In fig. 5, the sound signal stream detected by the first sound detection module is steam1, the steam1 contains a plurality of pulse signals varying along time (T), and the threshold value of the predetermined signal strength is T. It can be seen that in steam1, the signal strength of the pulse signal 50 is greater than the threshold value T, and therefore the first set of candidate signals contains the pulse signal 50. The sound signal stream detected by the second sound detection module is steam2, the steam1 contains a plurality of pulse signals varying along time (T), and the threshold value of the predetermined signal strength is also T. It can be seen that in steam2, the signal strength of both pulse signal 60 and pulse signal 70 is greater than the threshold value T, and therefore the second set of candidate signals includes pulse signal 60 and pulse signal 70.
Furthermore, a time difference d1 between the reception instants of the pulse signal 50 in the first candidate signal set and the pulse signal 60 in the second candidate signal set is determined, and a time difference d2 between the reception instants of the pulse signal 50 in the first candidate signal set and the pulse signal 70 in the second candidate signal set is determined. Assuming that D1 is smaller than M and D2 is larger than M, where M ═ D/c, D is the distance between the first and second sound detection modules, and c is the propagation speed of sound. Therefore, the pulse signal 50 of the pair of sound signals related to d1 is determined as the first sound signal, and the pulse signal 60 of the pair of sound signals is determined as the second sound signal.
Preferably, the first and second sound signals are ultrasonic waves having a code division multiple access format and contain a media access control address (MAC) of the second smart device. Accordingly, the first smart device can accurately identify the source of the sound signal based on the MAC address of the second smart device contained in the sound signal. When a plurality of sound sources emitting sound signals exist in the environment, the first intelligent device can accurately determine the relative angle with the sound source by using two direct signals from the same sound source without being interfered by other sound sources based on the extraction of the MAC address in the sound signals.
The embodiment of the invention also provides a relative angle determination method between the intelligent devices. The method is applicable to a first intelligent device which comprises a first sound detection moduleA block and a second sound detection module, the method comprising: determining a first moment when an ultrasonic signal sent by second intelligent equipment directly reaches a first sound detection module; determining a second moment when the ultrasonic signal directly reaches the second sound detection module; determining a time difference between the first time and the second time; and determining a relative angle between the first intelligent device and the second intelligent device based on the distance between the first sound detection module and the second sound detection module and the time difference. In one embodiment, determining the relative angle between the first smart device and the second smart device comprises: based on
Determining theta; wherein arcsin is an arcsine function, D is t × c, t is a time difference, c is a sound propagation speed, and D is a distance between the first sound detection module and the second sound detection module; determining a relative angle between a first smart device and a second smart device based on θ
Wherein
In one embodiment, the method further comprises at least one of the following processes:
(1) determining the ultrasonic signal with the intensity larger than a preset threshold value in a preset time window in the ultrasonic signal stream of the second intelligent device received by the first sound detection module as the ultrasonic signal directly reaching the first sound detection module, and determining the time of receiving the ultrasonic signal directly reaching the first sound detection module as the first time; and determining the ultrasonic signal with the intensity larger than the preset threshold value in the preset time window in the ultrasonic signal flow of the second intelligent device received by the second sound detection module as the ultrasonic signal of the direct second sound detection module, and determining the time of receiving the ultrasonic signal of the direct second sound detection module as the second time.
(2) Determining ultrasonic signals with the intensity larger than a preset threshold value in ultrasonic signal streams of the second intelligent device detected by the first sound detection module to form a first candidate signal set; determining the ultrasonic signals with the intensity larger than the preset threshold value in the ultrasonic signal flow of the second intelligent device detected by the second sound detection module to form a second candidate signal set; determining a respective time difference between the time of receipt of each ultrasonic signal in the first candidate signal set and the time of receipt of each ultrasonic signal in the second candidate signal set; the receiving time of a pair of ultrasonic signals with the time difference smaller than M is determined as a first time and a second time, wherein M is (D/c), D is the distance between the first sound detection module and the second sound detection module, and c is the propagation speed of sound.
The principle and calculation process of the relative positioning of the present invention are exemplarily explained as follows. Fig. 2 is a schematic diagram illustrating the principle of relative angle determination between smart devices according to the present invention. FIG. 3 is a schematic diagram of the calculation of relative angles between smart devices according to the present invention. As shown in fig. 2, a microphone a1 disposed at the bottom of smart device a emits an ultrasonic signal containing the MAC address of smart device a, and smart device B (not shown in fig. 2) has two microphones, microphone B1 and microphone B2, respectively, disposed at a distance. Wherein: microphone b1 receives the direct signal of the ultrasound signal L1 and microphone b2 receives the direct signal of the ultrasound signal L2. The ultrasonic signals reach the indirect signals of the microphone b1 and the microphone b2 after being transmitted by the obstacles, and do not participate in the subsequent relative angle calculation. Because the intelligent equipment is small, especially when two intelligent equipment are far away from each other, the direct signal L1、L2Can be considered as parallel lines.
As shown in FIG. 3, L1、L2Direct signals (not signals reflected by obstacles) received by the microphone B1 and the microphone B2 of the smart device B, respectively; d is the distance between microphone b1 and microphone b 2. For example, if the microphone B1 and the microphone B2 are respectively disposed at the upper and lower ends of the smart device B, D may be the length of the smart device B; from microphone b2 to direct signal L1Making a vertical line, wherein the distance between the vertical foot and the microphone b1 is d, and d is L1And L2Using a correlation algorithm of the signals, the direct signal L can be determined1Relative to the direct signal L2D may be calculated based on the delay time difference t, where d is t × c, and c is the propagation speed of sound in a medium (such as air); theta is an auxiliary angle, wherein
Therefore, the relative angle of the intelligent device A and the intelligent device B can be calculatedWherein
Preferably, smart device a and smart device B may be implemented as at least one of: a smart phone; a tablet computer; a smart watch; a smart bracelet; an intelligent sound box; a smart television; an intelligent earphone; smart robots, and the like.
The first sound detection module and the second sound detection module may be arranged at a plurality of locations of the smart device. Fig. 6 is a schematic diagram of a first exemplary arrangement of a first sound detection module and a second sound detection module in a smart device according to the present invention. In fig. 6, the first sound detection module 18 and the second sound detection module 19 are respectively disposed at both ends of the smart device in the length direction, and thus the length D of the smart device can be directly determined as the distance between the first sound detection module 18 and the second sound detection module 19. Fig. 7 is a schematic diagram of a second exemplary arrangement of a first sound detection module and a second sound detection module in a smart device according to the present invention. In fig. 7, the first sound detection module 18 and the second sound detection module 19 are respectively disposed at both ends of the smart device in the width direction, and thus the width D of the smart device can be directly determined as the distance between the first sound detection module 18 and the second sound detection module 19.
The above exemplary descriptions have been provided for the arrangement of the first sound detection module and the second sound detection module in the smart device, and those skilled in the art will appreciate that such descriptions are merely exemplary and are not intended to limit the scope of the embodiments of the present invention. In fact, currently, a smart device usually has two sets of microphones, and the two sets of microphones can be applied to the embodiment of the present invention as the first sound detection module and the second sound detection module without changing the smart device in terms of hardware.
The following describes a typical example of calculating a relative angle between smart devices using ultrasound based on an embodiment of the present invention. Fig. 8 is a schematic diagram of the relative positioning of a first smart device and a second smart device in accordance with the present invention. FIG. 10 is a flowchart illustrating an exemplary process for relative positioning between smart devices according to the present invention. In fig. 7, respective processing paths of two combined microphones detecting sound signals are illustrated, in which an Analog-to-Digital Converter (ADC) is a device converting an Analog signal of a continuous variable into a discrete Digital signal; a band-pass filter (BPF) is a device that allows waves of a particular frequency band to pass while shielding other frequency bands. The ultrasonic-based relative direction identification step between two intelligent devices comprises the following steps:
the first step is as follows: the first smart device transmits a location signal in ultrasound format containing the Mac address of the smart device 1.
The second step is that: and the two groups of microphones of the second intelligent device respectively detect the positioning signals, resolve the Mac address from the respective detected positioning signals, and confirm that the respective detected positioning signals originate from the same sound source based on the Mac address.
The third step: the second intelligent device calculates the distance difference d between two direct signals of the positioning signal based on the time difference between the two direct signals detected by the two groups of microphones contained in the second intelligent device.
The fourth step: second smart device computing
The incident angle of the signal
I.e. the first smart device is opposite to the second smart deviceAngle, where D is the distance of the two sets of microphones in the second smart device.
The fifth step: the second intelligent device displays the relative angle on the display interface of the second intelligent device
Thereby prompting the user for the relative orientation of the first smart device. For example, fig. 9 is a schematic diagram showing relative angles in an interface of a smart device according to the present invention.
For example, assume that in the environment shown in fig. 8, the first smart device is embodied as a smart speaker and the first smart device is embodied as a smart phone.
The method comprises the following steps: the intelligent sound box transmits an ultrasonic signal, wherein the ultrasonic signal comprises a Mac address of the intelligent sound box and is a signal based on a CDMA (code division multiple access) technical framework.
Step two: the two sets of microphone arrays of the smart phone receive the ultrasonic signals and solve a Mac address of the smart sound box, and meanwhile, the smart phone solves a distance difference d between two direct signals of the two sets of microphone arrays. Wherein: suppose that in the respective received signal streams stream1 and stream2 of the two groups of microphone arrays, there are direct signals whose signal intensity peaks are greater than the threshold value T, respectively, and thus the principle 1 is satisfied; further assume the arrival time difference of the two direct signals
Calculating d corresponding to the Δ t, wherein
The two sets of microphone distances D are known (i.e. handset length), assumed to be 0.145m, and D < D is visible, thus satisfying principle 2. Therefore, the two direct signals can be selected to calculate the relative angle, where d is 0.014 (m).
Step three: smartphone computing
Then the angle of incidence of the signal
The smart phone displays an angle of 84.4 degrees on a display screen of the smart phone, namely the smart sound box is in the direction of 84.4 degrees of the smart phone.
In addition, the embodiment of the invention also provides a method for determining the contacter. Preferably, the embodiment of determining the contacter may be optimized in combination with the above-described relative angle determination method described on the basis of fig. 1.
FIG. 11 is a flow chart of a method for determining a contacter in accordance with the present invention. The method is applicable to a first intelligent device, and as shown in fig. 11, the method includes:
step 1101: the first smart device receives an ultrasound signal from the second smart device containing an identification of the second smart device.
Here, the second smart device periodically transmits (e.g., via a microphone or an array of microphones built into the second smart device) an ultrasonic signal containing an identification of the second smart device. When the distance between the first smart device and the second smart device comes within a detection range (e.g., 50 meters) of the ultrasound signal, the first smart device may receive (e.g., via a microphone or an array of microphones built into the first smart device) from the second smart device the ultrasound signal containing the identification of the second smart device. When the distance between the first smart device and the second smart device exceeds the detection range of the ultrasonic signal (e.g., 50 meters), the first smart device is unable to receive the ultrasonic signal from the second smart device. The first intelligent device and the second intelligent device are both movable devices.
Step 1102: the first intelligent device analyzes the identification of the second intelligent device from the ultrasonic signal.
Here, the first smart device parses out the identification of the second smart device from the received ultrasound signal and saves the identification. Wherein the identification of the second smart device comprises a Media Access Control (MAC) address, an International Mobile Subscriber Identity (IMSI) or an International Mobile Equipment Identity (IMEI) of the second smart device, etc. Moreover, the identification of the second smart device may also be embodied as an instant messaging number, an email address, etc. of the user of the second smart device.
Step 1103: and when a preset reporting condition is met, the first intelligent device sends reporting information containing the identifier of the second intelligent device to the server, wherein the server determines the user corresponding to the identifier of the second intelligent device as a contact person of the user of the first intelligent device.
The reporting condition may include: (1) when the user of the first smart device is determined to be a particular person who needs to be investigated as a contacter (e.g., the user of the first smart device is identified as an infected person of an infectious disease); (2) when the preset reporting time is up; (3) determining that a user of the first smart device has arrived at the epidemic based on the geographic information of the first smart device; (4) other preset reporting conditions; and so on.
After receiving the report information, the server determines a user (for example, a user holding the second smart device) corresponding to the identifier of the second smart device as a contacter of the user of the first smart device. Then, when it is determined that the user of the first smart device is contagious, the server sends an alarm message (e.g., a short message) to the second smart device based on the identifier of the second smart device to notify the user of the second smart device to perform a corresponding test and self-quarantine, and continuously records the geographic information of the second smart device.
In one embodiment, the second intelligent device continuously transmits the ultrasonic signal according to a predetermined period, and the first intelligent device records each receiving time of the ultrasonic signal in each cycle and further includes each receiving time in the reported information; the server determines the continuous contact time of the user of the first intelligent device and the user of the second intelligent device based on each receiving moment, and determines the user of the second intelligent device as a key contacter when the continuous contact time is larger than a preset threshold value.
FIG. 12 is a schematic illustration of determining a duration in accordance with the present invention. Fig. 12 is a summary of the reporting information (including each receiving time) provided by the server based on the first smart device, where the horizontal axis is the number of the second smart device, and the vertical axis is the cycle number. A check mark (√) indicates that an ultrasound signal was received, and a cross mark (X) indicates that no ultrasound signal was received. Assume a predetermined threshold of sustained contact time of 10 minutes with 1 minute per cycle.
The server may find, based on fig. 12, that the sustained contact time between the first smart device and the second smart device numbered 1 is at least 10 minutes, for example, in the period 1 to the period 10, the first smart device continuously detects the ultrasonic signal transmitted by the second smart device numbered 1, so that the server recognizes that the user of the second smart device numbered 1 is a key contacter of the user of the first smart device, and has a greater risk of infection.
Embodiments of determining the contacter may be further optimized in connection with the relative angle determination method described in connection with fig. 1. Wherein: consider a first smart device user to have a greater risk of infection when in face-to-face contact with a second smart device user; the first smart device user has a lower risk of infection when in back-to-back contact with the second smart device user.
In one embodiment, a first smart device includes a first sound detection module and a second sound detection module; the second intelligent device sends the ultrasonic signals according to a preset period; the method further comprises the following steps: determining a time difference between a receiving time of a first ultrasonic signal that is directed to the first sound detection module and a receiving time of a second ultrasonic signal that is directed to the second sound detection module; determining a relative angle between the first smart device and the second smart device based on a distance between the first sound detection module and the second sound detection module and the time difference; wherein the first ultrasound signal and the second ultrasound signal are contained in ultrasound signals transmitted by the second smart device at the same point in time; the reported information further comprises relative angles; wherein the user of the second smart device is determined to be the key contacter when the server determines that the relative angle is within the predetermined angle range. For example, the angular range may be [ -5 degrees, +5 degrees]. The first sound detection module and the second sound detection module have a fixed distance. The first and second sound detection modules may be implemented as microphones or microphone arrays, respectively. The manner in which the first smart device calculates the relative angle may refer to1 about
The specific calculation process is not described in detail in the present invention. Specifically, first based on
Determining theta; wherein arcsin is an arcsine function, D is t × c, t is the time difference, c is the propagation speed of sound, and D is the distance between the first sound detection module and the second sound detection module; then determining the relative angle between the first intelligent device and the second intelligent function device based on theta
Wherein
In one embodiment, the first smart device further determines a distance between the first smart device and the second smart device and carries the distance in the reporting information to be sent to the server, such that the server determines the close contact based on three factors, namely distance, relative angle and duration of contact. At this time, when the server judges that the continuous contact time is greater than a preset continuous time threshold value, the distance is greater than a preset distance threshold value and the relative angle is within a preset angle range, the user of the second intelligent device is determined as a key contact of the user of the first intelligent device. Here, the first smart device may determine the distance to the second smart device based on a variety of ways. E.g. based on a sound localization (preferably ultrasound localization) approach, etc.
Example 1: the first smart device maintains time synchronization with the second smart device, the first ultrasonic signal further includes a transmission time T1 of the first ultrasonic signal, wherein the first smart device determining the distance between the first smart device and the second smart device includes: a calculator in the first intelligent device calculates the distance L between the first intelligent device and the second intelligent device; wherein L ═ (T2-T1) xc; c is the propagation speed of the ultrasound in the air; t2 is the time of reception of the first ultrasonic signal.
Example 2: the first smart device maintains time synchronization with the second smart device, the second ultrasonic signal further includes a transmission time T3 of the second ultrasonic signal, wherein the determining, by the first smart device, the distance between the first smart device and the second smart device includes: a calculator in the first intelligent device calculates the distance L between the first intelligent device and the second intelligent device; wherein L ═ (T4-T3) xc; c is the propagation speed of the ultrasound in the air; t4 is the reception time of the second ultrasonic signal.
Example 3: and determining the distance between the first intelligent device and the second intelligent device at the rotation stop point based on the rotation angle of the first intelligent device and the relative angle between the first intelligent device and the second intelligent device at the rotation stop point. Specifically, the first smart device is moved from a first location point T while centering around a fixed point A1Rotate to a second position point T2Determining the rotation angle of the first intelligent device; wherein the first smart device rotates to the second position point T2When the first and second sound detection modules are arranged on the first intelligent device, the relative angle between the first intelligent device and the second intelligent device is changed to zero or undergoes a process of continuously changing to an angle alpha after being changed to zero, wherein alpha is not more than 180 degrees, which is determined based on the difference of the receiving time of the direct ultrasonic signal sent by the first and second sound detection modules on the first intelligent device for the second intelligent device arranged at the position point B; and determining the distance between the first intelligent device and the second intelligent device based on the relative angle and the rotation angle. For example, at the second position point T2Here, the relative angle is zero; determining a distance between the first smart device and the second smart device based on the relative angle and the rotation angle comprises: based on
Determining when the first smart device is at the first location point T1The distance R between the first intelligent device and the second intelligent device1(ii) a Wherein R is2The distance between the fixed point A and the first intelligent device;
for the first smart device at a first location point T1The relative angle between the first smart device and the second smart device; psi1For angle of rotation, #1Is angle T1And AB. For another example: at a second position point T2Here, the relative angle is α; based on the relative angle and the rotation angle, determining the distance between the first smart device and the second smart device comprises: based on
Determining when the first smart device is at the second location point T2The distance R between the first intelligent device and the second intelligent device1(ii) a Wherein R is2The distance between the fixed point A and the first intelligent device;
for the first intelligent device at the second position point T2The relative angle between the first smart device and the second smart device; psi1For said angle of rotation, psi1Is less than T2AB。
Example 4: when the first intelligent device moves from the first position point to the second position point in a non-rotating mode, the distance between the first intelligent device and the second intelligent device at the second position point is determined based on the relative angle between the first intelligent device and the second intelligent device at the first position point and the relative angle between the first intelligent device and the second intelligent device at the second position point, wherein the first intelligent device at the second position point and the first intelligent device at the first position point are in the same direction. Specifically, when a first intelligent device is at a first position point, a relative angle 1 between the first intelligent device and a second intelligent device is determined based on a receiving time difference of a first sound detection module and a second sound detection module which are arranged on the first intelligent device aiming at a direct ultrasonic signal sent by the second intelligent device; when the first smart device moves to a second location point, the second smart device is targeted based on the first sound detection module and the second sound detection moduleDetermining a relative angle 2 between the first intelligent device and the second intelligent device according to the receiving time difference of the direct ultrasonic signal sent by the equipment; wherein the first smart device at the second location point is in the same orientation as the second smart device at the first location point; based on the relative angle 1 and the relative angle 2, the relative position of the first smart device and the second smart device is determined. Preferably, the relative angle 1 is phi1The relative angle 2 is phi2(ii) a Based on the relative angle 1 and the relative angle 2, determining the distance of the first smart device from the second smart device comprises: determination of R2Wherein
Wherein R is2The distance between the second position point and the second intelligent device; c is the propagation speed of sound; Δ T is a difference between a detection time within a detection time window of the first sound detection module at the first position point for the ultrasonic signal reaching the first sound detection module and a detection time within a detection time window of the first sound detection module at the second position point for the ultrasonic signal reaching the first sound detection module, or a difference between a detection time within a detection time window of the second sound detection module at the first position point for the ultrasonic signal reaching the second sound detection module and a detection time within a detection time window of the second sound detection module at the second position point for the ultrasonic signal reaching the second sound detection module.
While the above exemplary description describes an exemplary embodiment in which the first smart device calculates the distance to the second smart device, those skilled in the art will appreciate that this description is merely exemplary and is not intended to limit the scope of the embodiments of the present invention, for example, the smart device may also determine the distance to the second smart device by infrared ranging, bluetooth ranging, non-time-synchronized ultrasonic ranging, and the like.
Preferably, the first smart device and the second smart device may respectively include: a smart phone; a tablet computer; a smart watch; a smart bracelet; smart headsets, etc.
FIG. 13 is a block diagram of a system for determining a contacter in accordance with the present invention. In the system:
the first smart device includes: a receiving module for receiving an ultrasound signal from a second smart device containing an identification of the second smart device; the analysis module is used for analyzing the identifier of the second intelligent device from the ultrasonic signal; and the reporting module is used for sending reporting information containing the identifier of the second intelligent device to the server when a preset reporting condition is met, wherein the server determines the user corresponding to the identifier of the second intelligent device as the contact person of the user of the first intelligent device.
Preferably, the second smart device transmits the ultrasonic signal according to a predetermined cycle; the reporting module is used for recording each receiving moment of the ultrasonic signal and further comprises each receiving moment in the reporting information; the server determines the continuous contact time of the user of the first intelligent device and the user of the second intelligent device based on each receiving moment, and determines the user of the second intelligent device as a key contacter when the continuous contact time is larger than a preset threshold value.
The receiving module may include a first sound detection module and a second sound detection module. The reporting module is also used for determining the time difference between the receiving time of the first ultrasonic signal which directly reaches the first sound detection module and the receiving time of the second ultrasonic signal which directly reaches the second sound detection module; determining a relative angle between the first smart device and the second smart device based on a distance between the first sound detection module and the second sound detection module and a time difference; wherein the first ultrasound signal and the second ultrasound signal are contained in ultrasound signals transmitted by the second smart device at the same point in time; the reported information further comprises relative angles; and when the server determines that the relative angle is within the preset angle range, determining the user of the second intelligent device as the key contacter of the user of the first intelligent device.
Specifically, the server includes: the receiving module is used for receiving reporting information from the first intelligent equipment, wherein the reporting information comprises an identifier of the second intelligent equipment; the first intelligent device receives an ultrasonic signal containing an identifier of the second intelligent device from the second intelligent device, analyzes the identifier of the second intelligent device from the ultrasonic signal, and sends reporting information to a server when a preset reporting condition is met; a determination module to determine a user corresponding to the identification of the second smart device as a contacter of the user of the first smart device.
Examples are: suppose that Zhang III, Li IV and Wang V are strangers in a waiting hall of a railway station, Zhang III keeps close contact with Li IV for 10 minutes, and Zhang III keeps close contact with Wang V for 1 minute. Suppose that smart phones used by Zhang three, Li four and Wang five are all used for transmitting, receiving and analyzing ultrasonic signals.
The first step is as follows: the lei four, wang five smart phones transmit signals in an ultrasound format containing the unique identifier of the respective smart phone (Mac address/ID/anonymous identifier generated and assigned by the third party server, etc.), which may be signals based on the CDMA code division multiple access technology architecture. The second step is that: the smart phone of Zhang III detects the ultrasonic signal and analyzes the identifier from the detected ultrasonic signal. The third step: the smart phone of Zhang III records the received identifiers of the respective smart phones of Li IV and Wang V. The fourth step: seven days later, Zhang san unfortunate confirms that the pneumonia patient infected by SARS-CoV-2 novel coronavirus is diagnosed, Zhang san uploads all identifiers stored in the server for 14 days, and the server decrypts the identifiers and then clearly learns the contacter. Further, the server determines matching according to that the time spent between the two devices is not less than 10 minutes, namely the smart phone of Zhang III always receives and analyzes the identifiers of the mobile terminals of other users for more than 10 minutes. The fifth step: the screened stranger LiIV who closely contacts has higher infection possibility and further propagation risk. The server informs the Liqu that the Liqu approaches the diagnostician with positive detection result, and then executes corresponding test and self-isolation.
Therefore, the ultrasonic technology of the smart phone is adopted, the method based on the voice recognition between two intelligent devices is adopted, no extra hardware is needed to be laid, the contact person tracking based on the relative position is realized, people who have contact with SARS-CoV-2 confirmed patients are identified and tracked, people are helped to determine whether the new coronavirus pneumonia patients have been contacted, public health authorities are helped to track the propagation path of diseases, and possible indirect contacts are informed, so that the people can be detected. Wherein each user's smartphone can both transmit and receive ultrasound signals, but only record the ultrasound signals that are heard.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process implemented in the above embodiments of the present invention, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method of determining a contacter, the method being adapted to a first smart device, the method comprising:
receiving, from a second smart device, an ultrasound signal containing an identification of the second smart device;
analyzing the identification of the second intelligent device from the ultrasonic signal;
and when a preset reporting condition is met, sending reporting information containing the identifier of the second intelligent device to a server, wherein the server determines the user corresponding to the identifier of the second intelligent device as a contact person of the user of the first intelligent device.
2. The method of claim 1, wherein the identification of the second smart device comprises a media access control address, an international mobile subscriber identity, or an international mobile equipment identity of the second smart device.
3. The method according to claim 1, wherein the second smart device sends the ultrasonic signal according to a predetermined period, and the first smart device records each time of receiving the ultrasonic signal, and further includes the each time of receiving in the report information;
the server determines the continuous contact time of the user of the first intelligent device and the user of the second intelligent device based on each receiving moment, and determines the user of the second intelligent device as a key contacter when the continuous contact time is larger than a preset threshold value.
4. The method of claim 1, wherein the first smart device comprises a first sound detection module and a second sound detection module; the second intelligent device sends the ultrasonic signals according to a preset period;
the method further comprises the following steps:
determining a time difference between a reception time of a first ultrasonic signal that is direct to the first sound detection module and a reception time of a second ultrasonic signal that is direct to the second sound detection module; determining a relative angle between the first smart device and the second smart device based on a distance between the first sound detection module and the second sound detection module and the time difference; wherein the first ultrasound signal and the second ultrasound signal are contained in ultrasound signals transmitted by a second smart device at the same point in time; wherein the reporting information further comprises the relative angle;
wherein the user of the second smart device is determined to be a key contacter when the server determines that the relative angle is within a predetermined angle range.
5. An apparatus for determining a contacter, the apparatus being adapted for use with a first smart device, the apparatus comprising:
a receiving module for receiving an ultrasound signal from a second smart device containing an identification of the second smart device;
the analysis module is used for analyzing the identifier of the second intelligent device from the ultrasonic signal;
and the reporting module is used for sending reporting information containing the identifier of the second intelligent device to a server when a preset reporting condition is met, wherein the server determines the user corresponding to the identifier of the second intelligent device as a contact person of the user of the first intelligent device.
6. The apparatus of claim 5, wherein the identification of the second smart device comprises a media access control address, an international mobile subscriber identity, or an international mobile equipment identity of the second smart device.
7. The apparatus of claim 5, wherein the second smart device transmits the ultrasonic signal according to a predetermined period;
a reporting module, configured to record each time of receiving the ultrasonic signal, and further include the each time of receiving in the reporting information;
the server determines the continuous contact time of the user of the first intelligent device and the user of the second intelligent device based on each receiving moment, and determines the user of the second intelligent device as a key contacter when the continuous contact time is larger than a preset threshold value.
8. The apparatus of claim 5, wherein the receiving module comprises a first sound detection module and a second sound detection module; the second intelligent device sends the ultrasonic signals according to a preset period;
the reporting module is further configured to determine a time difference between a receiving time of a first ultrasonic signal that directly reaches the first sound detection module and a receiving time of a second ultrasonic signal that directly reaches the second sound detection module; determining a relative angle between the first smart device and the second smart device based on a distance between the first sound detection module and the second sound detection module and the time difference; wherein the first ultrasound signal and the second ultrasound signal are contained in ultrasound signals transmitted by a second smart device at the same point in time; wherein the reporting information further comprises the relative angle;
wherein the user of the second smart device is determined to be a key contacter when the server determines that the relative angle is within a predetermined angle range.
9. A server, comprising:
the receiving module is used for receiving reporting information from the first intelligent equipment, wherein the reporting information comprises an identifier of the second intelligent equipment; the first intelligent device receives an ultrasonic signal containing an identifier of the second intelligent device from the second intelligent device, analyzes the identifier of the second intelligent device from the ultrasonic signal, and sends the report information to a server when a preset report condition is met;
a determination module to determine a user corresponding to the identification of the second smart device as a contacter of the user of the first smart device.
10. A computer-readable storage medium having computer-readable instructions stored thereon for performing the method of determining a contacter of any one of claims 1-4.
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