Fall alarm method and system based on horizontal plane layered detection

Abstract

The invention discloses a fall alarm method based on horizontal plane layered detection, and the method comprises the steps: at least arranging inductors at two different heights based on the height and area of a detected space, and carrying out the target detection of a horizontal interval of one height through the inductor at each height; the method comprises the following steps: intermittently and repeatedly detecting a detected target in horizontal intervals of different heights through inductors at different heights, and detecting whether the detected target exists or not by the inductors at different heights every time so as to obtain a detection result; comparing continuous multiple detection results or comparing detection results obtained in a period of set time, and judging whether the detected target in the detected space is in a falling state or not; when it is confirmed that the detected target in the detected space is in the tumble state, an alarm is given, tumble state detection is accurate, and the detected target can be rescued in time.

Description

Technical Field

[0001] The present invention relates to the field of artificial intelligence technology, and more particularly to a fall alarm method and system based on horizontal plane layered detection. Background Art

[0002] With the improvement of living standards, people pay more and more attention to health and safety, and falls are very common accidents, especially for the elderly, children, patients, and disabled people who are more prone to such accidental falls.

[0003] At present, with the rapid acceleration of population aging in the whole society and the increasingly serious problem of empty-nest elderly people, investigations and studies have found that falls are an important cause of injury and death in my country, and are the leading cause among the elderly over 65 years old. If the falls of the elderly can be detected accurately and in time, appropriate rescue measures can be taken in time to reduce serious injuries or deaths caused by falls.

[0004] There are already fall prevention and fall alarm systems in the prior art, mainly in two ways. The first is non-wearable, in which a camera is set in the detected space to identify and judge whether there is a fall through image analysis. There are some methods for fall detection using image recognition, but usually only ordinary cameras are used for image acquisition. Therefore, there are problems such as failure to identify falls at night and failure to identify when part of the human body is blocked. In addition, the prediction key points used in the prior art are relatively few, resulting in poor detection accuracy.

[0005] The second is through wearable monitoring, mainly through devices such as bracelets, watches and belts. Since wearable devices need to be used in contact to be effective, the elderly often forget to wear them after charging, resulting in poor monitoring results. In addition, the motion patterns detected by wearable devices are complex and the accuracy is not high. Non-wearable methods include millimeter wave radar, camera and wifi detection. Among them, camera detection may infringe on the user's privacy, and detection may result in poor detection results when the wifi signal is poor.

[0006] In view of the problems existing in the current fall alarm system, the applicant has proposed a new fall alarm method and system. Summary of the invention

[0007] In view of this, the present invention provides a fall alarm method and system based on horizontal plane layered detection.

[0008] In order to achieve the above objectives, the first aspect of the present invention proposes a fall alarm method based on horizontal plane layered detection:

[0009] Based on the height and area of ​​the detected space, sensors are respectively arranged at at least two different heights, and the sensors at each height perform target detection on a horizontal interval of a height;

[0010] The sensors at different heights perform intermittent and multiple detections on the detected target in horizontal intervals at different heights. Each time the detection is performed, the sensors at different heights respectively detect whether the detected target exists to obtain the detection result;

[0011] Compare multiple consecutive detection results or the detection results obtained within a set period of time to determine whether the detected target in the detected space is in a falling state;

[0012] When it is confirmed that the detected object in the detected space is in a falling state, an alarm is issued.

[0013] As a preferred solution of the present invention, the height difference between adjacent sensors at different heights is determined based on the parameter performance of the sensors themselves; the horizontal interval ranges detected by the sensors at different heights do not overlap.

[0014] As a preferred solution of the present invention, the sensors at different heights perform intermittent and multiple detections on the detected target in horizontal intervals at different heights. Each time the detection is performed, the sensors at different heights respectively detect whether the detected target exists, and in the detection results, when the detected target enters the detected space for the first time, the sensors at different heights detect the detected target to determine whether the detected target is valid;

[0015] If the detected target is valid, multiple consecutive detection results are compared or the detection results obtained within a set period of time are compared to determine whether the detected target in the detected space is in a falling state;

[0016] If the detected target is invalid, no fall judgment is performed.

[0017] As a preferred solution of the present invention, when the detected target enters the detected space for the first time, sensors at different heights detect the detected target to determine whether the detected target is valid. When more than one sensor at a specified height simultaneously detects the existence of the detected target, the detected target is determined to be valid, otherwise it is invalid.

[0018] As a preferred solution of the present invention, the sensors at different heights perform intermittent and multiple detections on the detected targets in horizontal intervals at different heights. Each time the detection is performed, the sensors at different heights respectively detect whether the detected targets exist, and in the detection results, when the detected targets enter the detected space for the first time, the sensors detect the number of detected targets entering.

[0019] As a preferred solution of the present invention, the sensors are respectively arranged at at least two different heights based on the height and area of ​​the detected space, and the sensor is arranged at least at the first height, and the height value range of the first height is between 10cm-30cm.

[0020] As a preferred solution of the present invention, the sensors respectively arranged at at least two different heights include: a low-position sensor and a high-position sensor. During detection, the low-position sensor and the high-position sensor respectively detect the detected target to obtain the detection result, wherein:

[0021] When the lower sensor detects the detected target and the higher sensor also detects the detected target, the detection result is that the detected target is in a normal state;

[0022] When the lower sensor detects the detected target, and the higher sensor does not detect the detected target, the detection result is that the state of the detected target is abnormal;

[0023] When comparing the detection results for multiple consecutive times or comparing the detection results obtained within a set period of time, when the detection results for multiple consecutive times show that the state of the detected target is abnormal or the detection results within a set period of time show that the state of the detected target is abnormal, it is determined that the detected target in the detected space is in a falling state.

[0024] As a preferred solution of the present invention, during the detection, the low-position sensor and the high-position sensor respectively detect the detected target, and in the detection result obtained, when the low-position sensor does not detect the detected target and the high-position sensor does not detect the detected target, the detection result is that the detected target leaves the detected space.

[0025] The second invention of the present invention proposes a fall alarm system based on horizontal plane layered detection, comprising:

[0026] A plurality of sensor modules are arranged at different heights in the detected space and are used to detect detected objects in different horizontal intervals;

[0027] A main control module receives detection results detected by multiple sensor modules;

[0028] Output module, the main control module compares multiple detection results and outputs signals through the output module; the server obtains the signal of the output module;

[0029] The terminal module receives the signal from the server to obtain the fall information of the detected target.

[0030] As a preferred implementation manner of the present invention, the sensor module is one of a microwave sensor, a laser scanning sensor, an infrared sensor, and an ultrasonic sensor.

[0031] In the above-mentioned fall alarm method and system based on horizontal plane layered detection, sensors at different heights perform intermittent and multiple detections on the detected target in horizontal intervals at different heights. Each time a detection is performed, the sensors at different heights respectively detect whether the detected target exists to obtain a detection result; the detection results of multiple consecutive detections or the detection results obtained within a set period of time are compared to determine whether the detected target in the detected space is in a fall state, and then an alarm is issued; this scheme is to perform detection simultaneously through sensors at different heights. According to the different heights of the detection targets, such as the first time entering the detected space, two sensors at different heights are both The detected target can be detected, and at this time it is judged that the detected target enters the inner detection space in a normal state (which can be called a standing state). When the detected target falls down, in the subsequent consecutive multiple detections, sensors at different heights perform detections at the same time, and only the low-position sensor can detect the detected target, while the high-position sensor cannot detect the detected target, then it is judged that the detected target has fallen down; if in the subsequent consecutive multiple detections, both the low-position and high-position sensors fail to detect the detected target, then it is judged that the detected target has left the detected space; through this solution, the horizontal plane is detected in layers, the detection accuracy is high, and the judgment is accurate, which greatly improves the accuracy of judging that the detected target has fallen down. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0033] Figure 1 It is a flow chart of a fall alarm method based on horizontal plane layered detection according to the present invention;

[0034] Figure 2 The present invention is a principle block diagram of a fall alarm system based on horizontal plane layered detection. DETAILED DESCRIPTION

[0035] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0036] Example 1

[0037] A fall alarm method based on horizontal plane layered detection, such as Figure 1 As shown, the method comprises the following steps:

[0038] S100: Based on the height and area of ​​the detected space, sensors are respectively arranged at at least two different heights, and the sensors at each height perform target detection on a horizontal interval of a height;

[0039] S200: intermittently and multiple times detect the detected target in horizontal intervals at different heights by using sensors at different heights, and each time the sensors at different heights respectively detect whether the detected target exists, and obtain a detection result;

[0040] S300: Comparing multiple consecutive detection results or comparing detection results obtained within a set period of time to determine whether the detected target in the detected space is in a falling state;

[0041] S400: When it is confirmed that the detected target in the detected space is in a falling state, an alarm is issued.

[0042] The present invention detects the detected target by using a plurality of sensors at different heights, and then obtains a series of detection results, compares these detection results, and determines whether the detected target is in a falling state, and then issues an alarm.

[0043] Specifically, in step S100, sensors are installed at different heights in the detected space, and the detected space may be a user's living room, bedroom, bathroom, etc. Here, the detected space is defined as a bathroom, and sensors are installed at different heights in the bathroom;

[0044] The detection targets of the present invention are mainly the elderly. To detect whether the elderly have fallen in the bathroom, 2, 3 or even 4 sensors can be set in the bathroom.

[0045] In the step S100, sensors are arranged at least at two different heights. Here, two different heights are taken as an example, that is, two sensors are set as an example for further description. One of the two sensors is at a first height, that is, a low position, and the other is at a second height, that is, a high position;

[0046] After an elderly person falls, there are two types of falling states. One is lying down. No matter what position, supine or prone, the elderly person is lying on the ground. According to the stature of the elderly person, even if he is lying on the ground, his thickness is at least X1cm, so the height of the low-position sensor is set to X1cm. The other is lying down, that is, he may fall while holding onto a sink or wall and his back is supported. According to the average height of adults in my country, the height of the elderly is generally higher than 100cm and lower than 200cm. According to the general height distribution, the height of the high-position sensor is set to X2cm, and 100cm≤X2≤200cm.

[0047] At the same time, according to the range of the elderly's height, even if the elderly falls in a lying position, their lying height is less than X2cm, so the height of the high-position sensor is set at X2cm;

[0048] Then, the low-position sensor detects the detected target within the horizontal interval of X1cm height, and the high-position sensor detects the detected target within the horizontal interval of X2cm height;

[0049] Preferably, X1=20cm, X2=100cm, then the low-position sensor detects the detected target within a horizontal interval of 20cm height, and the high-position sensor detects the detected target within a horizontal interval of 100cm height;

[0050] In step S200, sensors at different heights perform intermittent and multiple detections on the detected target in horizontal intervals at different heights, and each time the sensors at different heights respectively detect whether the detected target exists, and obtain the detection results;

[0051] When performing fall detection, it is necessary to first determine whether the detected target entering the detected space is valid, that is, step S201: when the detected target enters the detected space for the first time, sensors at different heights detect the detected target to determine whether the detected target is valid;

[0052] If the detected target is valid, multiple consecutive detection results are compared or the detection results obtained within a set period of time are compared to determine whether the detected target in the detected space is in a falling state;

[0053] If the detected target is invalid, no fall judgment is performed;

[0054] Specifically, the above statement has that the height of an average elderly person is between 100cm and 200cm. When the elderly person enters the detected space, the low-position sensor and the high-position sensor will detect the existence of the detected target when detecting at the same time, and the detection result obtained is that the detected target is in a normal state, that is, the detected target is valid; then the detection results of multiple consecutive times or the detection results obtained within a set period of time are compared to determine whether the detected target in the detected space is in a falling state;

[0055] If a pet or a child is less than 100 cm tall and enters the detected space, the low sensor will detect the presence of the target, but the high sensor will not sense the presence of the detected target. In this case, the result of the first detection is that the detected target is not normal, that is, the detected target is invalid, and no fall judgment will be made.

[0056] When performing fall detection judgment, it is also necessary to judge the number of detected targets entering the detected space, that is, step S202: the sensors at different heights perform intermittent and multiple detections on the detected targets in horizontal intervals at different heights, and each time the sensors at different heights respectively detect whether the detected targets exist, and in the detection results obtained, when the detected targets enter the detected space for the first time, the sensors detect the number of detected targets entering;

[0057] Specifically, in actual use, when detecting the detected targets, the detected targets may enter the detected space at the same time, or the number of detected targets entering the detected space successively is greater than 1. It is possible to detect multiple detected targets at the same time, and compare the detection results in groups; specifically, determine which detected target is in a normal state, or which detected target is in a fallen state;

[0058] Optionally, it is also possible that when the number of detected targets entering the detected space at the same time, or the number of detected targets entering the detected space one after another is greater than 1, at this time, although the two sensors are still performing detection intermittently and multiple times, the multiple detection results do not need to be compared and judged, that is, there is no need to enter the fall judgment; because when the number of detected targets is greater than 1, such as 2 or 3, it proves that there are 2 or 3 people in the detected space. When one of them falls, the others can immediately observe that someone has fallen and then provide rescue.

[0059] Furthermore, the sensors respectively arranged at at least two different heights include: a low-position sensor and a high-position sensor. During detection, the low-position sensor and the high-position sensor respectively detect the detected target to obtain a detection result, wherein:

[0060] When the lower sensor detects the detected target and the higher sensor also detects the detected target, the detection result is that the detected target is in a normal state;

[0061] When the lower sensor detects the detected target, and the higher sensor does not detect the detected target, the detection result is that the state of the detected target is abnormal;

[0062] When comparing the detection results for multiple consecutive times or comparing the detection results obtained within a set period of time, when the detection results for multiple consecutive times show that the state of the detected target is abnormal or the detection results within a set period of time show that the state of the detected target is abnormal, it is determined that the detected target in the detected space is in a falling state.

[0063] Furthermore, during the detection, the low-position sensor and the high-position sensor respectively detect the detected target, and in the detection result obtained, when the low-position sensor does not detect the detected target and the high-position sensor does not detect the detected target, the detection result is that the detected target leaves the detected space.

[0064] Specifically, in the comparison of multiple consecutive test results or the comparison of test results obtained within a set period of time, this embodiment adopts the comparison of multiple consecutive test results, specifically, the comparison of three consecutive test results.

[0065] More specifically, generally, the detected target (i.e., the elderly) enters the detected space in the form of standing and walking. The height of the elderly is higher than 100 cm. When entering the detected space for the first time, the low-position sensor detects the detected target in the horizontal interval of X1 cm height, and obtains result A11; the high-position sensor detects the detected target in the horizontal interval of X2 cm height, and obtains result A12; the results A11 and A12 are combined to obtain the detection result;

[0066] Subsequently, sensors at different heights intermittently and multiple times detect the target:

[0067] In the second detection, the low-position sensor detects the target within a horizontal interval of X1 cm, and obtains result A21; the high-position sensor detects the target within a horizontal interval of X2 cm, and obtains result A22;

[0068] In the third detection, the low-position sensor detects the target within the horizontal interval of X1cm height, and the result is A31; the high-position sensor detects the target within the horizontal interval of X2cm height, and the result is A32;

[0069] In the fourth detection, the low-position sensor detects the target within the horizontal interval of X1 cm, and obtains the result A41; the high-position sensor detects the target within the horizontal interval of X2 cm, and obtains the result A42;

[0070] In the Nth detection, the low-position sensor detects the target within the horizontal interval of X1cm height, and obtains the result AN1; the high-position sensor detects the target within the horizontal interval of X2cm height, and obtains the result AN2;

[0071] Compare multiple consecutive detection results or detection results obtained within a set period of time, and then determine whether the detected target has fallen;

[0072] Here, multiple consecutive detection results are compared, and three consecutive detection results can be selected for comparison to determine whether the detected target has fallen;

[0073] Here, sensors at different heights perform multiple detections intermittently, and the intermittent time can be 1s, 2s, 3s, 5s, 7s, 10s, 12s, 15s, etc. The intermittent time can be set as needed.

[0074] Specifically, it is further described in the following table: (In the following table, "1" indicates that the detected target is detected, and 0 indicates that the detected target is not detected)

[0075]

[0076]

[0077] According to the above table, when the detected target first enters the detected space, the low-position sensor and the high-position sensor perform the first detection and both detect the existence of the detected target. Therefore, the detected target is valid during the first detection and the state of the detected target is normal.

[0078] In the three consecutive tests, in the second to fourth tests, the high-position sensor did not detect the detected target in the fourth test, the second test result was (1,1), and the detected target was in a normal state; the third test result was (1,1), and the detected target was in a normal state; the fourth test result was (1,0), and the detected target was in an abnormal state; in the three consecutive tests, if the three consecutive test results do not meet the condition that the detected target is in an abnormal state, it is judged as a non-fall state;

[0079] In another three consecutive tests, in the fourth to sixth tests, the fourth test result is (1,0), and the state of the detected target is abnormal; the fifth test result is (1,0), and the state of the detected target is abnormal; the sixth test result is (1,1), and the state of the detected target is normal; if the three consecutive test results do not meet the condition that the state of the detected target is abnormal, it is judged to be a non-fall state;

[0080] In this judgment, the fourth and fifth detection results both indicate that the detected target is in an abnormal state, and the sixth detection result indicates that the detected target is in a normal state, which can be further determined as the detected target squatting or bending down briefly;

[0081] In another three consecutive tests, in the eighth to tenth tests, the eighth test result is (1,0), and the state of the detected target is abnormal; the ninth test result is (1,0), and the state of the detected target is abnormal; the tenth test result is (1,1), and the state of the detected target is abnormal; if the three consecutive test results show that the state of the detected target is abnormal, then it is judged that the detected target is in a normal state; then it is judged that the detected target is in a fallen state;

[0082] After determining that the detected target is in a falling state, an alarm signal is issued so that the detected target (elderly person) can receive timely rescue.

[0083] When the detected target leaves the detected space, the result of (0, 0) will be generated for three consecutive times, that is, the low-position sensor and the high-position sensor have not detected the detected target; when the detected target is detected again next time, it is the first time to detect the detected target.

[0084] Furthermore, in step S400, when it is confirmed that the detected object in the detected space is in a falling state, an alarm is issued. There are many ways to issue the alarm, such as equipping a home with an alarm, and when it is determined to be in a falling state, the alarm issues a sound alarm;

[0085] Alternatively, the alarm information may be sent to the user's mobile phone through an Internet connection, such as by text message, mini program, or APP information.

[0086] In one embodiment, the height difference between adjacent sensors at different heights is determined based on the parameter performance of the sensors themselves; the horizontal interval ranges detected by the sensors at different heights do not overlap.

[0087] The two sensors used in the present invention are of the same model, both of which have extremely small vertical detection angles and extremely large horizontal detection angles.

[0088] Furthermore, since the vertical detection angles of the two sensors are extremely small, according to the above, the low-position sensor detects the detected target within the horizontal interval of 20 cm height, and the high-position sensor detects the detected target within the horizontal interval of 100 cm height; and the low-position sensor will only detect the detected target within the horizontal interval of 20 cm height, and will not be affected by the detected target within the horizontal interval of 100 cm height; similarly, the high-position sensor will only detect the detected target within the horizontal interval of 100 cm height, and will not be affected by the detected target within the horizontal interval of 20 cm height;

[0089] Furthermore, the horizontal detection angle of the two sensors is extremely large, at least greater than or equal to 90 degrees. The two sensors are installed at the corners of the detected space. The detected space is generally rectangular, so the detection range of the low-position sensor can cover the entire horizontal interval of 20 cm in height; similarly, the detection range of the high-position sensor can cover the entire horizontal interval of 100 cm in height.

[0090] This solution uses sensors at different heights to perform intermittent and multiple detections on the detected target in horizontal intervals at different heights. Each time a detection is performed, the sensors at different heights respectively detect whether the detected target exists and obtain the detection results; the detection results of multiple consecutive detections or the detection results obtained within a set period of time are compared to determine whether the detected target in the detected space is in a falling state, and then an alarm is issued; this solution uses sensors at different heights to perform detection at the same time. According to the different heights of the detection targets, such as the first time entering the detected space, two sensors at different heights can detect the detected target. At this time, it is judged that the detected target enters the inner detection space in a normal state (which can be called a standing state). When the detected target falls down, in the subsequent consecutive multiple detections, sensors at different heights perform detections at the same time. Only the low-position sensor can detect the detected target, while the high-position sensor cannot detect the detected target, then it is judged that the detected target has fallen down; if in the subsequent consecutive multiple detections, both the low-position and high-position sensors fail to detect the detected target, then it is judged that the detected target has left the detected space; through this solution, the horizontal plane is detected in layers, the detection accuracy is high, and the judgment is accurate, which greatly improves the accuracy of judging whether the detected target has fallen down.

[0091] Example 2

[0092] Fall alarm system based on horizontal layer detection, such as Figure 2 As shown, including:

[0093] A plurality of sensor modules 100 are arranged at different heights in the detected space and are used to detect detected objects in different horizontal intervals;

[0094] The main control module 200 receives the detection results detected by the multiple sensor modules;

[0095] Output module 300, the main control module compares multiple detection results and outputs signals through the output module;

[0096] Server 400, obtains a signal from an output module;

[0097] The terminal module 500 receives the signal from the server to obtain the fall information of the detected target.

[0098] Furthermore, the sensor module is one of a microwave sensor, a laser scanning sensor, an infrared sensor, and an ultrasonic sensor, and these sensors of several specifications can detect the detected target;

[0099] For example, infrared sensors detect specific infrared rays emitted by the human body and then determine who has entered the detected space;

[0100] Specifically, the sensor module 100 includes a first sensor 110 and a second sensor 120, the first sensor 110 is set at a low position, and the second sensor 120 is set at a high position. The specifications of the first sensor 110 and the second sensor 120 at different heights are the same, and can detect whether there is a detected target in the horizontal interval of the first height and whether there is a detected target in the horizontal interval of the second height through the same detection principle;

[0101] The main control module 200 can be a main control device or a host, etc. The main control module 200 is connected and communicated with the sensor 100. The main control module 200 can generally include a microprocessor integrated on a control motherboard. The main control module 200 controls the switch of the entire system and can be provided with a display screen, etc.

[0102] The output module 300 may be integrated on a microprocessor.

[0103] The server 400 can be a local wired LAN, wireless LAN, etc.; or it can be an online server developed specifically for the system. When a fall is detected, the fall information is uploaded to the server and then sent to the corresponding terminal module 500 via the server 400.

[0104] Here, the terminal module 500 may refer to a mobile phone, and the server 400 may send the fall information to the mobile phone via SMS; or a corresponding app or applet is installed on the mobile phone, and the fall information is prompted on the app or applet accordingly, so that the mobile phone user can take rescue measures as soon as possible after receiving the message;

[0105] The terminal module 500 can also be an alarm device installed in the house. If it is detected that the detected target falls, the alarm device in the house will sound an alarm, so that the people in the house can know that someone has fallen in the detected space and provide rescue as soon as possible.

[0106] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fall alarm method based on horizontal plane layered detection, characterized in that: Based on the height and area of ​​the detected space, sensors are respectively arranged at at least two different heights, and the sensors at each height perform target detection on a horizontal interval of a height; The sensors at different heights perform intermittent and multiple detections on the detected target in horizontal intervals at different heights. Each time the detection is performed, the sensors at different heights respectively detect whether the detected target exists to obtain the detection result; Compare multiple consecutive detection results or the detection results obtained within a set period of time to determine whether the detected target in the detected space is in a falling state; When it is confirmed that the detected object in the detected space is in a falling state, an alarm is issued.

2. A fall alarm method based on horizontal plane layered detection according to claim 1, characterized in that: Based on the sensor's own parameter performance, the height difference between adjacent sensors at different heights is determined; the horizontal interval ranges detected by sensors at different heights do not overlap.

3. A fall alarm method based on horizontal plane layered detection according to claim 1, characterized in that: The sensors at different heights perform intermittent and multiple detections on the detected target in horizontal intervals at different heights. Each time the detection is performed, the sensors at different heights respectively detect whether the detected target exists, and the detection results are obtained. When the detected target enters the detected space for the first time, the sensors at different heights detect the detected target to determine whether the detected target is valid; If the detected target is valid, multiple consecutive detection results are compared or the detection results obtained within a set period of time are compared to determine whether the detected target in the detected space is in a falling state; If the detected target is invalid, no fall judgment is performed.

4. A fall alarm method based on horizontal plane layered detection according to claim 3, characterized in that : When the detected target enters the detected space for the first time, sensors at different heights detect the detected target to determine whether the detected target is valid. When more than one sensor at a specified height detects the existence of the detected target at the same time, the detected target is determined to be valid, otherwise it is invalid.

5. A fall alarm method based on horizontal plane layered detection according to claim 1, characterized in that : The sensors at different heights perform intermittent and multiple detections on the detected target in horizontal intervals at different heights. Each time a detection is performed, the sensors at different heights respectively detect whether the detected target exists, and in the detection results, when the detected target enters the detected space for the first time, the sensor detects the number of detected targets entering.

6. A fall alarm method based on horizontal plane layered detection according to any one of claims 1 to 5, characterized in that: Based on the height and area of ​​the detected space, sensors are respectively arranged at at least two different heights, and at least a sensor is arranged at the first height, and the height value range of the first height is between 10cm and 30cm.

7. A fall alarm method based on horizontal plane layered detection according to any one of claims 3 to 5, characterized in that: The sensors are respectively arranged at at least two different heights, including: a low-position sensor and a high-position sensor. During detection, the low-position sensor and the high-position sensor respectively detect the detected target to obtain a detection result, wherein: When the lower sensor detects the detected target and the higher sensor also detects the detected target, the detection result is that the detected target is in a normal state; When the lower sensor detects the detected target, and the higher sensor does not detect the detected target, the detection result is that the state of the detected target is abnormal; When comparing the detection results for multiple consecutive times or comparing the detection results obtained within a set period of time, when the detection results for multiple consecutive times show that the state of the detected target is abnormal or the detection results within a set period of time show that the state of the detected target is abnormal, it is determined that the detected target in the detected space is in a falling state.

8. A fall alarm method based on horizontal plane layered detection according to claim 7, characterized in that: During the detection, the low-position sensor and the high-position sensor respectively detect the detected target to obtain the detection result. When the low-position sensor does not detect the detected target and the high-position sensor does not detect the detected target, the detection result is that the detected target leaves the detected space.

9. A fall alarm system based on horizontal plane layered detection, characterized in that: include: A plurality of sensor modules are arranged at different heights in the detected space and are used to detect detected objects in different horizontal intervals; A main control module receives detection results detected by multiple sensor modules; Output module: The main control module compares multiple detection results and outputs signals through the output module; Server, obtains the signal of the output module; The terminal module receives the signal from the server to obtain the fall information of the detected target.

10. The fall alarm system based on horizontal plane layer detection according to claim 9, characterized in that: The sensor module is one of a microwave sensor, a laser scanning sensor, an infrared sensor, and an ultrasonic sensor.

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