CN105336102B - Tumble detection positioning method and device - Google Patents

Abstract

The present invention provides a fall detection and positioning method and device, comprising: obtaining the resultant acceleration of the human body, and judging whether the resultant acceleration is greater than a first threshold; if the resultant acceleration is greater than the first threshold, then obtaining the intensity of changes in the human body motion state according to the resultant acceleration value, and determine whether the value of the intensity of the motion state change is greater than the second threshold; if the value of the intensity of the motion state change is greater than the second threshold, then delay the preset time to obtain the human body posture angle, and judge whether the posture angle is greater than the third threshold; if so, then It is determined that the human body falls. The result of judging whether the human body has fallen through the above-mentioned three-level judgment has a high accuracy rate, and the interference of various normal motion states is excluded, and each of the above-mentioned judgments is carried out independently of each other, and only the current first-level judgment is suspected In the case of a fall, the latter stage will make a judgment. This setting can not only improve the accuracy of the system, but also greatly simplify the algorithm and improve real-time performance.

Description

Fall detection and positioning method and device

technical field

The invention relates to the field of behavior analysis and recognition methods, in particular to a fall detection and positioning method and device.

Background technique

With the advancement of social medical care and the improvement of living conditions, human life expectancy is getting longer and the number of elderly people is increasing, and the issue of providing for the elderly has attracted more and more attention. At present, there are more and more incidents in which many old people accidentally fall when they go out alone and cause disability and death. The reason is that the old people cannot get timely assistance after they fall. Therefore design a kind of method and equipment that can in time find that the old man falls and notify the designated personnel to rescue it and its importance.

In the prior art, human body fall detection is generally divided into two types based on vision and based on wearable sensors in terms of hardware. Among them, the method of human body fall detection based on vision is susceptible to inaccurate detection data due to the influence of the external environment, such as the influence of lighting conditions, occlusions and camera quality. In addition, due to the limited monitoring area of the camera, the monitored elderly activities are limited.

Chinese patent document CN102707305A discloses a fall detection and positioning system and method, which are based on wearable sensors to monitor human falls. The system disclosed in this patent document mainly includes an inertial navigation module, a GPS module, a main controller and a Sim-300 module. composition. Among them, the inertial navigation module consists of a three-axis gyroscope, a three-axis magnetometer and a three-axis accelerometer. The fall detection algorithm disclosed in this patent document requires a large amount of data collection after system initialization to make the system accurate. In the early use, there is not enough sample information as a support, and the misjudgment rate will be high. At the same time, in the data processing algorithm disclosed in this patent document, the data collected by the three-axis gyroscope, three-axis magnetometer and three-axis accelerometer need to be fused multiple times to calculate the fusion acceleration, so as to determine whether the human body has fallen. Fall, this kind of calculation method is complicated, can not quickly judge the human body falls and send a distress message to the designated personnel.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is to overcome the defect of inaccurate human fall detection in the prior art, so as to provide a fall detection and positioning method and device.

For this reason, technical scheme of the present invention is as follows:

A fall detection and positioning method, comprising:

Obtaining the resultant acceleration of the human body, and judging whether the resultant acceleration is greater than a first threshold;

If the resultant acceleration is greater than the first threshold, then according to the resultant acceleration, obtain the value of the change intensity of the human body motion state, and judge whether the value of the change intensity of the motion state is greater than the second threshold;

If the movement state change intensity value is greater than the second threshold, delaying the preset time to obtain the human body posture angle, and judging whether the posture angle is greater than the third threshold;

If the attitude angle is greater than the third threshold, it is determined that the human body has fallen.

Preferably, if the attitude angle is greater than the third threshold, the step of judging that the human body has fallen is replaced by: if the attitude angle is greater than the third threshold, then judging whether the difference between the combined acceleration and the acceleration of gravity is within If it is within the preset range, if it is, then determine the steps for the human body to fall.

Preferably, the step of obtaining human synthetic acceleration includes:

Set the horizontal forward direction when the human body is standing as the positive direction of the X-axis; the horizontal leftward direction when the human body is standing is the positive direction of the Y-axis; the vertical upward direction when the human body is standing is the positive direction of the Z-axis; X, Y, The three axes of Z are perpendicular to each other;

Obtain the first acceleration Ax in the X-axis direction; obtain the second acceleration Ay in the Y-axis direction; obtain the third acceleration Az in the Z-axis direction; then: the resultant acceleration

Preferably, the step of obtaining the intensity value of the human body motion state change according to the combined acceleration includes:

If the sampling frequency of the first acceleration, the second acceleration and the third acceleration is f, and the rate of calculating the combined acceleration SVM is also f; then:

The numerical value of the change intensity of the human body movement state in,

The resultant acceleration at time t _n ;

The resultant acceleration at tn _-1 moment;

The next moment of time t _n is time t _n-1 , and the time difference between them is

Preferably, the step of obtaining the human body posture angle comprises: the human body posture angle Wherein, Az: the third acceleration; g: gravitational acceleration.

Preferably, the first threshold is 2.8g-3.2g; and/or the second threshold is 150g/s-200g/s; and/or the third threshold is 55°-65°; and/or The preset range of the difference between the resultant acceleration and the acceleration of gravity is ±6.

A fall detection and positioning device, comprising:

A positioning module, used for locating current position information;

The control module is used to determine whether the human body has fallen according to the above method; when it is determined that the human body has fallen, delaying the preset time to retrieve the current position information from the positioning module and send it to the communication module;

A communication module, configured to receive the location information sent by the control module and send it to a predetermined mobile phone.

Preferably, the fall detection and positioning device further includes an acceleration acquisition module, configured to acquire the first acceleration, the second acceleration and the third acceleration and send them to the control module.

Preferably, the fall detection and positioning device further includes an audible and visual alarm module, which is used to give an audible and visual alarm when the control module determines that the human body has fallen; and/or an emergency button, which is used to When the help button is pressed, the control module retrieves the current location information from the positioning module and sends it to the preset mobile phone through the communication module; and/or the reset button, when the control module determines that the human body has fallen , if the reset button is pressed within the delayed preset time, the control module will not retrieve the current location information from the positioning module.

Preferably, the positioning module is further configured to send current location information to the control module at preset intervals, and when the location information exceeds a preset range, the control module controls the communication module to send the current location information to Send to default phone.

Preferably, the communication module is also used to receive an inquiry command sent by a predetermined mobile phone number and send it to the control module;

The control module is also used to control the communication module to send the current location information to the mobile phone that sent the query instruction when receiving the query instruction.

The technical solution of the present invention has the following advantages:

1. The fall detection and location method and device provided by the present invention include three levels of judgment: judging whether the combined acceleration is greater than the first threshold; judging whether the movement state change intensity value is greater than the second threshold; judging whether the attitude angle is greater than the third threshold. The result of judging whether the human body has fallen through the above-mentioned three-level judgment has a high accuracy rate, and the interference of various normal motion states is excluded, and each of the above-mentioned judgments is carried out independently of each other, and only the current first-level judgment is suspected In the case of a fall, the latter stage will make a judgment. This setting can not only improve the accuracy of the system, but also greatly simplify the algorithm and improve real-time performance.

2. The fall detection and positioning method and device provided by the present invention may further include a fourth level of judgment after judging that the attitude angle is greater than the third threshold: judging whether the difference between the resultant acceleration and the acceleration of gravity is within a preset range. Since the human body is generally in a static state after a fall, the resultant acceleration at this time should be close to the acceleration of gravity. Therefore, by setting the above-mentioned fourth-level judgment, the accuracy of judging whether the human body has fallen is further improved, and the reliability of the system is improved. , reducing the misjudgment rate.

3. In the method and device for fall detection and positioning provided by the present invention, the frequency f at which the first acceleration, the second acceleration and the third acceleration are sampled is equal to the rate f at which the combined acceleration SVM is calculated, so that the human body movement state change intensity value MADS is only By calculating the interval time difference as The difference between the two combined acceleration SVMs can be obtained, which further simplifies the algorithm and improves the timeliness of fall detection.

4. The fall detection and positioning device provided by the present invention is provided with an acousto-optic alarm module, so that after the human body falls, it is easy to be discovered by outsiders and rescued in time; an emergency button is set to facilitate the elderly who use the device to actively call for help; set reset The button makes the device more intelligent. When the old man falls down and confirms that he is not hindered, pressing the reset button within a preset time can cancel sending the current location information to the designated mobile phone.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

FIG. 1 is a flowchart of a specific example of a fall detection and positioning method in Embodiment 1 of the present invention;

2 is a schematic diagram of a human body acceleration coordinate system in the fall detection and positioning method in Embodiment 1 of the present invention;

FIG. 3 is a schematic diagram of human body posture angles in the fall detection and positioning method in Embodiment 1 of the present invention;

FIG. 4 is a functional block diagram of a specific example of a fall detection and positioning device in Embodiment 2 of the present invention;

Reference signs: 1-positioning module; 2-control module; 3-communication module; 4-acceleration acquisition module; 5-sound and light alarm module; 6-emergency button; 7-reset button.

detailed description

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically or electrically connected; it can be directly connected, or indirectly connected through an intermediary, or it can be the internal communication of two components, which can be wireless or wired connect. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as there is no conflict with each other.

Example 1

As shown in Figure 1, this embodiment provides a fall detection and positioning method, which may include:

S1: Obtain the resultant acceleration of the human body, and judge whether the resultant acceleration is greater than the first threshold, if yes, go to step S2; if not, continue to execute step S1. Among them, the numerical value of the combined acceleration of the human body indicates the size of the impact force received by the human body, that is, the exercise intensity of the human body. The larger the value, the greater the impact force received by the human body. The difference between the total acceleration SVM of human daily life and the total acceleration SVM of falling is used to judge the first level of falling, that is, the value of the total acceleration SVM of daily life is the size of the first threshold. The combined acceleration SVM of running in daily life is generally less than 2.5g; the combined acceleration SVM of walking is generally less than 1.5g; therefore, the value range of the first threshold can be 2.8g-3.2g, preferably 3g.

In step S1, obtaining the human body combined acceleration SVM can be implemented in the following manner:

As shown in Figure 2, a three-dimensional rectangular coordinate system of the human body is established, and the horizontal forward direction when the human body is standing is set as the positive direction of the X-axis; the horizontal direction to the left when the human body is standing is the positive direction of the Y-axis; the vertical direction when the human body is standing The upward direction is the positive direction of the Z axis; the X, Y, and Z axes are perpendicular to each other;

Obtain the first acceleration Ax in the X-axis direction; obtain the second acceleration Ay in the Y-axis direction; obtain the third acceleration Az in the Z-axis direction; then: the resultant acceleration

S2: Acquire the value of the change intensity of the human motion state according to the combined acceleration, and judge whether the value of the change intensity of the motion state is greater than the second threshold, if yes, go to step S3; if not, go to step S1. Among them, the magnitude of the intensity value MADS of the human body movement state indicates the speed of the change of the human body movement, and the larger the value, the faster the change of the human body movement. Under normal circumstances, the value MADS of the change intensity of the human motion state is relatively small, and the correct rate of fall judgment can be improved by detecting the value MADS of the change intensity of the human motion state. The value range of the second threshold may be: 150g/s-200g/s, preferably 160g/s.

MADS is defined as the intensity value of human movement state change as That is, the absolute average value of differential and combined acceleration amplitudes. If this method is used to calculate the intensity value MADS of the human body motion state change, differential and integral calculations are required, which will inevitably lead to poor real-time performance of fall detection. A simplified algorithm is provided in this embodiment as follows:

The frequency of sampling the first acceleration, the second acceleration and the third acceleration is set to f (eg: 100HZ), and the rate of calculating the combined acceleration SVM is also set to f (eg: 100HZ); therefore each discrete combined acceleration The time difference of the SVM values is fixed as Because the discrete differential calculation can be replaced by the difference quotient calculation, and because the time interval of the resultant acceleration SVM is the same, then only by calculating the difference of the resultant acceleration SVM twice, it can reflect the magnitude of the human body movement state change intensity value MADS, thus It reflects the severity of changes in the state of human movement. That is: the value of the intensity of changes in the state of human motion in, The resultant acceleration at time t _n ; The resultant acceleration at _{tn -1} moment; the next moment at tn moment is tn _-1 moment, and the time difference between the two is Such setting simplifies the algorithm and improves the timeliness of fall detection.

S3: Delay the preset time to obtain the human body posture angle, and judge whether the posture angle is greater than the third threshold; if yes, go to step S4; if not, go to step S1. When the human body falls, it will generally fall to the ground in about 2s, so the accuracy of the detection can be guaranteed by obtaining the human body posture angle after a preset time delay (such as 2s). The value range of the third threshold may be 55°-65°, preferably 60°.

Because the state of motion of falling is relatively violent, then in step S1, detecting the combined acceleration SVM of the human body can get rid of the least violent activities (such as: walking and standing, etc.) in the state of motion of the human body; in step S2, detecting MADS can exclude some daily activities (such as: leaning back, lying down, lowering the waist, etc.). However, since activities of daily life may also satisfy the SVM and MADS thresholds (such as jumping), distinguishing the difference between sports like jumping and falling requires a third-level judgment. When the first and second levels are determined as a suspected fall, the determination of the attitude angle in step S3 is performed. The fall process of the human body is divided into accelerated falling, ground contact and static, and the acceleration of the human body during the process is weightless, overweight and static.

As a specific implementation, as shown in Figure 3, the human body posture angle Among them, Az: third acceleration; g: gravitational acceleration.

S4: It is determined that the human body has fallen.

The result of judging whether the human body has fallen through the three-level judgments in steps S1-S3 has a high accuracy rate, eliminating the interference of various normal motion states, and each of the above-mentioned judgments is carried out independently of each other, and only the current one When the first-level judgment is suspected of falling, the next-level judgment will be made. This setting can not only improve the accuracy of the system, but also greatly simplify the algorithm and improve real-time performance.

On the basis of the foregoing scheme, after step S3, before S4, it may also include:

S3 ^/ : judge whether the difference between the resultant acceleration and the acceleration of gravity is within the preset range, if so, then proceed to step S4; if not, then proceed to step S1. Since the human body is basically in a static state after a fall under normal circumstances, the total acceleration SVM of the human body should be around the acceleration of gravity, so it can assist in distinguishing between strenuous exercise and a fall event. Therefore, setting the fourth-level judgment in step S3 ^/ further improves the accuracy of judging whether the human body has fallen, improves the reliability of the system, and reduces the misjudgment rate. As a specific implementation, the preset range of the difference mentioned in this step can be: ±6; preferably, the difference is within the range of ±5, that is, if the combined acceleration at this time ranges from 95g to 105g If it is within the preset range, it is considered to be a fall.

In steps S1-S3, the preferred values for the preset range of the first threshold, the second threshold, the third threshold and the difference between the combined acceleration and the acceleration of gravity in step S3 ^/ are based on a height of 170CM and a body weight of 60KG The human body model is tested, and the preferred value is obtained according to the test results. Those skilled in the art should understand that when people have different heights and weights, the most preferred values of the above thresholds may also be different.

Example 2

As shown in Figure 4, this embodiment provides a fall detection and positioning device, because the acceleration that can best reflect the posture of the human body is the waist and neck, but because it is not convenient to wear the device on the neck, this embodiment The device provided in should preferably be worn on the waist of an elderly person. The device can include:

The positioning module 1 is used for locating the current position information. As a specific implementation manner, the positioning module 1 can be realized by using a GPS positioning module and/or a Beidou positioning module in the prior art, which will not be described in detail here.

The control module 2 is used to determine whether the human body has fallen according to the method described in Embodiment 1; when it is determined that the human body has fallen, delay the preset time to retrieve the current position information from the positioning module 1 and send it to the communication module 3 ; The preset time of the delay can be set according to specific needs, such as: between 0s-10s.

The communication module 3 is used to receive the location information sent by the control module 2 and send it to a predetermined mobile phone.

On the basis of the above solution, the device provided by this embodiment may further include an acceleration acquisition module 4 for acquiring the first acceleration, the second acceleration and the third acceleration and sending them to the control module 2 .

On the basis of the above solution, an audible and visual alarm module 5 may also be included, which is used to issue an audible and visual alarm when the control module 2 determines that the human body has fallen. By arranging the sound and light alarm module 5, the human body is easy to be discovered by outsiders after a fall, and rescued in time.

On the basis of the above solution, an emergency button 6 may also be included. When the emergency button 6 is pressed, the control module 2 retrieves the current location information from the positioning module 1 and sends it to the preset mobile phone through the communication module 3 . Such arrangement makes it easy for the old man who uses the device to ask for help actively, which is convenient to use.

On the basis of the above scheme, a reset button 7 can also be included. When the control module 2 judges that the human body has fallen, if within the preset time of delay (this time is the same as the delay preset time in the control module 2, it is adjusted from the positioning module 1). The time to get the current location information is consistent) press the reset button 7, then the control module 2 will not retrieve the current location information from the positioning module 1; Pressing the reset button 7 can cancel sending the location information to the designated mobile phone, which is easy to use.

On the basis of the above scheme, the positioning module 1 can also be used to send the current location information to the control module 2 at preset time intervals. When the location information exceeds the preset range, the control module 2 controls the communication module 3 to send the current location information to to the default phone. This function is the electronic map fence function, which means that if the old man carrying the fall detection device walks out of the designated geographical area, the system will actively call the police. The map fence function can prevent the elderly from going too far due to getting lost, which may cause safety hazards. Since the effective positioning of GPS or Beidou must be outdoors, effective GPS or Beidou positioning information cannot be obtained in most indoors. In order to improve the stability of the system, it is necessary to ensure that the positioning data is stable and accurate. Therefore, the positioning module 1 sends the current position information to the control module 2 every preset time interval, which ensures the stability of the system and enables the system to read the information stored in the control module 2 when the effective positioning information cannot be obtained in time. The location information of the system is used to alarm, thereby improving the efficiency and reliability of the fall detection device.

In order to make the fall detection device provided by this embodiment more practical, the communication module 3 in the device provided by this embodiment is also used to receive an inquiry command sent by a predetermined mobile phone number and send it to the control module 2; when the control module 2. When receiving the query instruction, control the communication module 3 to send the current location information to the mobile phone number that sent the query instruction. That is: when the relatives of the elderly wearing the device want to know the location information of the elderly, they can call the elderly's fall detection terminal through the mobile phone; when the fall detection terminal receives the query command, it will send back the information obtained by GPS through SMS. location information.

In order to protect the privacy of the old man, the control module 2 also judges each mobile phone number that sends the query command, and judges whether it is the predetermined mobile phone number stored in the control module 2, if not, the positioning information is not sent back.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow diagram procedure or procedures and/or block diagram procedures or blocks.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (10)

1. A fall detection and positioning method, characterized in that, comprising: Obtaining the resultant acceleration of the human body, and judging whether the resultant acceleration is greater than a first threshold; If the resultant acceleration is greater than the first threshold, then according to the resultant acceleration, obtain the value of the change intensity of the human body motion state, and judge whether the value of the change intensity of the motion state is greater than the second threshold; If the movement state change intensity value is greater than the second threshold, delaying the preset time to obtain the human body posture angle, and judging whether the posture angle is greater than the third threshold; If the attitude angle is greater than the third threshold, it is determined whether the difference between the resultant acceleration and the acceleration of gravity is within a preset range, and if so, it is determined that the human body has fallen. 2. method according to claim 1, is characterized in that, the step of described obtaining human combined acceleration comprises: Set the horizontal forward direction when the human body is standing as the positive direction of the X-axis; the horizontal leftward direction when the human body is standing is the positive direction of the Y-axis; the vertical upward direction when the human body is standing is the positive direction of the Z-axis; X, Y, The three axes of Z are perpendicular to each other; Obtain the first acceleration Ax in the X-axis direction; obtain the second acceleration Ay in the Y-axis direction; obtain the third acceleration Az in the Z-axis direction; then: the resultant acceleration 3. The method according to claim 2, wherein the step of obtaining the numerical value of the human body motion state change intensity according to the combined acceleration comprises: If the sampling frequency of the first acceleration, the second acceleration and the third acceleration is f, and the rate of calculating the combined acceleration SVM is also f; then: The numerical value of the change intensity of the human body movement state in, The resultant acceleration at time t _n ; The resultant acceleration at tn _-1 moment; The next moment of time t _n is time t _n-1 , and the time difference between them is 4. method according to claim 2, is characterized in that, the step of described acquisition human posture angle comprises: The human body posture angle Wherein, Az: the third acceleration; g: gravitational acceleration. 5. The method according to any one of claims 2-4, characterized in that, the first threshold is 2.8g-3.2g; and/or the second threshold is 150g/s-200g/s; and/or Or the third threshold is 55°-65°; and/or the preset range of the difference between the resultant acceleration and the acceleration of gravity is ±6. 6. A fall detection and positioning device, characterized in that it comprises: A positioning module, used for locating current position information; The control module is used to determine whether the human body has fallen according to the method described in any one of claims 2-5; when it is determined that the human body has fallen, delaying the preset time to retrieve the current position information from the positioning module and It is sent to the communication module; A communication module, configured to receive the location information sent by the control module and send it to a predetermined mobile phone. 7. The device according to claim 6, further comprising an acceleration acquisition module, configured to acquire the first acceleration, the second acceleration and the third acceleration and send them to the control module. 8. The device according to claim 6, further comprising an audible and visual alarm module, which is used for performing an audible and visual alarm when the control module determines that the human body has fallen; and/or An emergency button, used for when the emergency button is pressed, the control module retrieves the current location information from the positioning module and sends it to a preset mobile phone through the communication module; and/or A reset button. When the control module determines that the human body has fallen, if the reset button is pressed within the delayed preset time, the control module will not retrieve the current position information from the positioning module. 9. The device according to any one of claims 6-8, wherein the positioning module is further configured to send current location information to the control module at preset intervals, and when the location information exceeds the preset When within range, the control module controls the communication module to send the current location information to the preset mobile phone. 10. The device according to any one of claims 6-8, wherein the communication module is also used to receive an inquiry command sent by a predetermined mobile phone number and send it to the control module; The control module is also used for controlling the communication module to send the current location information to the mobile phone sending the query instruction when receiving the query instruction.