Anti-lost bracelet and positioning system and method of anti-lost bracelet

Abstract

The invention relates to the field of personnel positioning, in particular to an anti-lost bracelet and a positioning system and method of the anti-lost bracelet. The anti-lost bracelet mainly comprises a three-axis acceleration sensor, a heart rate monitoring module, a Bluetooth module, a GPS module, a 4G module and a microprocessor, wherein the three-axis acceleration sensor is used for acquiring the step number of a wearer of the anti-lost bracelet; the heart rate monitoring module is used for monitoring the heart rate of a wearer of the anti-lost bracelet; the Bluetooth module is used for acquiring current position information according to the position of the Bluetooth gateway; the 4G module is used for reporting positioning information and / or alarm information in a 4G communication mode; the GPS module is used for acquiring current position information according to the GPS data; the microprocessor is used for starting the corresponding module to acquire the step number, the heart rate or the current position information according to a specified time window, and starting the corresponding module to report positioning information and / or alarm information. According to the invention, the overall power consumption of the anti-lost bracelet can be reduced, the endurance time of the anti-lost bracelet is prolonged, and the safety risk of a wearer of the anti-lost bracelet is reduced.

Description

Technical Field

[0001] The present invention relates to the field of personnel positioning, and in particular to an anti-lost bracelet, and a positioning system and method for the anti-lost bracelet. Background Art

[0002] At present, smart bracelets can realize positioning functions through WiFi, 4G base stations, GPS, etc. In daily life, by carrying an anti-lost bracelet with positioning function, the elderly, children or people with dementia can be found in time when they are lost.

[0003] The positioning capability of the anti-lost bracelet depends on power supply, and the wearer of the anti-lost bracelet may not be familiar with the complex operation of electronic devices, or have poor memory, resulting in missing charging or forgetting to carry it, causing safety hazards. However, due to weight and volume requirements, the battery capacity of the anti-lost bracelet cannot be too large, resulting in limited battery life, requiring the wearer to frequently remove it for charging, which cannot meet the long battery life requirements required for anti-lost.

[0004] In view of this, how to overcome the defects of the prior art and solve the problem that the anti-lost bracelet cannot achieve long battery life when the battery capacity is limited is a problem to be solved in this technical field. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention solves the problem that the anti-lost bracelet cannot achieve long battery life when the battery capacity is limited.

[0006] The embodiment of the present invention adopts the following technical solution:

[0007] In the first aspect, the present invention provides an anti-lost bracelet, specifically: a three-axis acceleration sensor, a heart rate monitoring module, a Bluetooth module, a GPS module, a 4G module and a microprocessor, specifically including: a three-axis acceleration sensor for obtaining the number of steps of the wearer of the anti-lost bracelet; a heart rate monitoring module for monitoring the heart rate of the wearer of the anti-lost bracelet; a Bluetooth module for obtaining current location information according to the location of a Bluetooth gateway, and reporting positioning information and / or alarm information through the Bluetooth gateway; a 4G module for reporting positioning information and / or alarm information using a 4G communication method; a GPS module for obtaining current location information according to GPS data; a microprocessor for starting a corresponding module according to a specified time window to obtain the number of steps, heart rate or current location information, and starting a corresponding module to report positioning information and / or alarm information according to one or more of the number of steps, heart rate and current location information.

[0008] Preferably, the anti-lost bracelet also includes a WiFi module, and the WiFi module is used to obtain current location information according to the location of the WiFi router, and report positioning information and / or alarm information through the WiFi router.

[0009] Preferably, the anti-lost bracelet also includes an alarm module, and the alarm module is used to alarm according to one or more of the number of steps, heart rate and current location information.

[0010] In a second aspect, a positioning system for an anti-lost bracelet is provided, comprising: the anti-lost bracelet described in the first aspect, at least one first Bluetooth gateway, at least one second Bluetooth gateway and a lost alarm server, specifically comprising: the first Bluetooth gateway is distributed in a first safety range of the anti-lost bracelet wearer, the second Bluetooth gateway is distributed in a second safety range of the anti-lost bracelet wearer, the first Bluetooth gateway and the second Bluetooth gateway are used to provide current location information to the anti-lost bracelet, and send the positioning information and / or alarm information reported by the anti-lost bracelet to the lost alarm server; the lost alarm server is used to receive the positioning information and / or alarm information reported by the anti-lost bracelet or the Bluetooth gateway, and determine whether to trigger an alarm according to the positioning information and / or alarm information.

[0011] In a third aspect, the present invention provides a positioning method for an anti-lost bracelet, specifically: using the positioning system described in the second aspect for positioning, including: the anti-lost bracelet performs Bluetooth gateway detection at specified time intervals to determine whether the wearer of the anti-lost bracelet is within a safe range; when within a first safe range, the anti-lost bracelet obtains the number of steps and heart rate according to a first time window, and issues an alarm based on the number of steps and heart rate; when within a second safe range, the anti-lost bracelet obtains the number of steps and heart rate according to a second time window, and uses a Bluetooth module to obtain current location information, and performs positioning and alarm based on the number of steps, heart rate and current location information; when outside the first safe range and the second safe range, the anti-lost bracelet obtains the number of steps and heart rate according to a second time window, and uses a GPS module or a WiFi module to obtain current location information, and performs positioning and alarm based on the number of steps, heart rate and current location information.

[0012] Preferably, the anti-lost bracelet obtains the number of steps and heart rate according to the first time window, specifically including: the anti-lost bracelet starts the three-axis acceleration sensor and the heart rate monitoring module according to the period of the first time window, obtains the number of steps and heart rate within the first time window, and then turns off the three-axis acceleration sensor and the heart rate monitoring module.

[0013] Preferably, when located within the second safety range, the current location information is obtained by using the Bluetooth module, and positioning and alarm are performed according to the number of steps, heart rate and current location information, specifically including: when the number of steps is within the step range and the heart rate is within the heart rate range, the current location information is not obtained; when the number of steps is greater than or equal to the upper limit of the step range and the heart rate is within the heart rate range, the current location information is obtained by using the Bluetooth module, and the positioning information is reported through the Bluetooth module; when the number of steps is less than the lower limit of the step range and the heart rate is within the heart rate range, the current location information is obtained by using the Bluetooth module according to a specified period, and the positioning information is reported through the Bluetooth module.

[0014] Preferably, when located outside the first safety range and the second safety range, the using of the GPS module or the WiFi module to obtain the current location information specifically includes: the anti-lost bracelet scans the WiFi router and obtains the service set identifier of the WiFi router; when the WiFi module obtains the service set identifier of one or more WiFi routers, the service set identifier is used as the current location information; when the WiFi module does not obtain the service set identifier, the GPS module is used to obtain the current location information; when the WiFi module does not obtain the service set identifier and the GPS module does not obtain the current location information, the number of steps and heart rate are obtained according to the second time window, and the 4G module is used to alarm according to the specified period.

[0015] Preferably, the method further includes: the Bluetooth module broadcasts the number of steps, heart rate and positioning information via a Bluetooth broadcast packet so as to broadcast an alarm via the Bluetooth broadcast packet; wherein the Bluetooth broadcast packet includes a step number field, a heart rate field and a positioning information field.

[0016] Preferably, the method further includes: when the number of steps is less than the lower limit of the step number range, and the heart rate is greater than the upper limit of the heart rate range or less than the lower limit of the heart rate range, obtaining current position information, and performing positioning and alarming according to the current position information.

[0017] Compared with the prior art, the beneficial effect of the present invention is that in the anti-lost bracelet provided by the present invention, a step detection method is performed by a three-axis acceleration sensor with low energy consumption, and the safety risk of the wearer of the anti-lost bracelet is preliminarily determined by the number of steps. The communication locator is turned on for positioning only when the safety risk is high, thereby reducing the overall power consumption of the anti-lost bracelet and improving the battery life.

[0018] Secondly, in the positioning system of the anti-lost bracelet provided by the present invention, multiple Bluetooth gateways are set up within the safe range where the wearer conducts activities. When the wearer is within the safe range, a low-power Bluetooth module can be used for positioning and communication, which reduces the power consumption each time the communication locator is turned on for positioning and improves the battery life.

[0019] On the third aspect, the positioning method of the anti-lost bracelet provided by the present invention provides positioning methods and alarm triggering conditions in a variety of different scenarios. By using a variety of methods in combination, the lowest power consumption can be achieved while ensuring the safety of anti-lost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 Comparison of power consumption of different positioning methods;

[0022] Figure 2 A schematic diagram of the structure of an anti-lost bracelet provided by an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of another anti-lost bracelet structure provided by an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of another anti-lost bracelet structure provided by an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the system structure of a positioning system for an anti-lost bracelet provided by an embodiment of the present invention;

[0026] Figure 6 A flow chart of a positioning method for an anti-lost bracelet provided by an embodiment of the present invention;

[0027] Figure 7 A flow chart of another positioning method for an anti-lost bracelet provided by an embodiment of the present invention;

[0028] Figure 8 A flow chart of another positioning method for an anti-lost bracelet provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] The present invention is an architecture of a specific functional system, so the specific embodiments mainly illustrate the functional logical relationship between the various structural modules, and do not limit the specific software and hardware implementation methods.

[0031] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0032] Embodiment 1:

[0033] like Figure 1 As shown in the figure, it is a comparison of power consumption of different positioning methods. In existing anti-lost bracelets, GPS system or WiFi router is usually used for positioning, and positioning information is reported through 4G module. When GPS positioning is used and positioning information is reported through 4G, it takes 90 seconds and the average current reaches 230Ma; when WiFi positioning is used and positioning information is reported through 4G, it takes 20 seconds and the average current reaches 62Ma. The above two methods have high power consumption per unit time, and the battery life is shorter under the same battery capacity.

[0034] On the other hand, the working time of a Bluetooth connection is about 0.1s, and the average current is only 5mA. When using a three-week acceleration sensor and a heart rate monitoring module to perform a step count and heart rate detection, the power consumption is negligible compared to the power consumption during positioning. Therefore, using Bluetooth positioning and using single exercise step count detection and heart rate detection at the same time, the power consumption required is also much lower than the power consumption consumed by GPS system or WiFi router positioning.

[0035] like Figure 2 , is a schematic diagram of the architecture of an anti-lost bracelet according to an embodiment of the present invention, including: a three-axis acceleration sensor, a heart rate monitoring module, a Bluetooth module, a GPS module, a 4G module and a microprocessor.

[0036] The three-axis acceleration sensor is used to obtain the number of steps of the wearer of the anti-lost bracelet. When the number of steps is small, it can be regarded that the wearer has not moved away from the position of the last positioning, and no re-positioning is performed, and the last positioning information is used as the current positioning information; when the number of steps is large, it can be regarded that the wearer's position has moved and needs to be re-positioned. Furthermore, the three-axis acceleration sensor can only obtain the number of steps to reduce the performance requirements of the microprocessor; it can also obtain the number of steps and walking direction at the same time, and determine the actual moving distance of the wearer according to the deployment and walking direction. When the number of steps is large but the actual moving distance is small, positioning is not turned on to reduce the number of positioning times and reduce overall power consumption. In actual implementation, the three-axis acceleration can use the SC7A22C chip of Silan Microelectronics.

[0037] The heart rate monitoring module is used to monitor the heart rate of the wearer of the anti-lost bracelet. The wearer of the anti-lost bracelet may be an elderly person or a patient with a disease. In addition to preventing loss, the wearer's heart rate needs to be monitored to avoid risks such as sudden illness. On the other hand, a body temperature monitoring module can also be set in the anti-lost bracelet to further monitor the health of the wearer. In actual implementation, the heart rate detection module can use the GH3011 heart rate measurement chip.

[0038] The Bluetooth module is used to obtain the current location information based on the location of the Bluetooth gateway, and report the positioning information and / or alarm information through the Bluetooth gateway. The wearer of the anti-lost bracelet usually only moves in a limited area. Therefore, a Bluetooth gateway can be set up in the safe range of the wearer's daily activities. When the Bluetooth module detects the Bluetooth gateway, the anti-lost bracelet reports the unique identifier of the Bluetooth gateway, or the Bluetooth gateway directly reports its own positioning information without using a WiFi router or GPS system for positioning, thereby reducing power consumption during positioning. On the other hand, when there is no Bluetooth gateway around the wearer and a 4G data connection cannot be established, the Bluetooth module can send a Bluetooth broadcast packet containing alarm information, so that the wearer's accompanying person can receive the alarm information through a mobile Bluetooth device to prevent the wearer from getting lost. In actual implementation, the Bluetooth module can be integrated into the nrf52840 chip.

[0039] The GPS module is used to obtain the current location information based on the GPS data, and the 4G module is used to report the positioning information and / or alarm information using the 4G communication method. Outside the safe range, Bluetooth positioning cannot be used. Therefore, the anti-lost bracelet provided in this embodiment also includes a GPS module and a 4G module to complete the positioning and reporting outside the safe range. Furthermore, the anti-lost bracelet provided in this embodiment includes a three-week acceleration sensor. Therefore, in order to reduce the power consumption of GPS positioning and 4G reporting, when the number of steps is small, it can also be regarded as the wearer has not left the position of the previous positioning, and the positioning can be turned off for a short time. In actual implementation, the 4G communication module and the GPS module can adopt the EC800M-CN chip module, which not only has a 4G communication function, but also has a global navigation satellite system function. It can complete GPS positioning and 4G reporting at the same time, and reduce the overall power consumption through functional integration.

[0040] The microcontroller unit (MCU) is used to start the corresponding module to obtain the number of steps, heart rate or current location information according to the specified time window, and start the corresponding module to report positioning information and / or alarm information according to one or more of the number of steps, heart rate and current location information. In actual implementation, the microprocessor only needs to complete the functions of module startup, module data acquisition, and simple numerical calculations. Therefore, a low-power processor can be used, such as the nrf52840 chip produced by Nordic, to reduce overall power consumption.

[0041] In actual implementation scenarios, when the wearer is outside the safety range, although he cannot connect to the Bluetooth gateway, there may be public WiFi routers around him. Since the power consumption of WiFi positioning is less than that of GPS positioning, WiFi positioning can be used instead of GPS positioning outside the safety range to reduce power consumption. Figure 3 As shown, the anti-lost bracelet also includes a WiFi module, which is used to obtain current location information according to the location of the WiFi router, and report positioning information and / or report to the WiFi router.

[0042] In actual implementation, when the step count is too low during the usual activity time period, it indicates that the wearer may faint or be trapped in a small space; when the heart rate is too low or too high, it indicates that the wearer may have a sudden illness; when the wearer's current location information is about to leave the safe range, it indicates that the wearer may be at risk of getting lost; when the battery of the anti-lost bracelet is low, it indicates that the anti-lost bracelet may be powered off and shut down, making the wearer at risk of getting lost. In the above cases, the anti-lost bracelet needs to sound an alarm so that the accompanying personnel can detect the risk of the wearer in time. Figure 4 As shown, the anti-lost bracelet also includes an alarm module, which is used to alarm according to one or more of the number of steps, heart rate and current location information. The alarm module can alarm through sound and light signals, or trigger the Bluetooth module to send a Bluetooth broadcast packet containing alarm information, or trigger the 4G module to make a one-click call for help, or trigger the 4G module to send an alarm message to an emergency contact, or use other methods to alarm.

[0043] In actual implementation, the functional modules in the anti-lost bracelet provided in this embodiment can be selectively used or used in combination according to actual needs without conflict.

[0044] In actual use scenarios, when the anti-lost bracelet provided by this embodiment is powered by a 600mAh lithium-ion battery, it can last for 110 days when only Bluetooth positioning is used; and it can last for more than 60 days when only WiFi positioning or GPS positioning is used. It can be seen that the anti-lost bracelet provided by this embodiment can meet the long battery life requirements.

[0045] The anti-lost bracelet provided in this embodiment obtains the number of steps of the wearer through a three-axis acceleration sensor, determines whether it is within a safe range through a Bluetooth module, determines whether the wearer has moved through the number of steps, and does not turn on positioning when the wearer is within a safe range or has not moved, thereby reducing power consumption and increasing battery life. The long battery life means that the wearer or the accompanying person does not need to charge frequently, thereby improving the convenience and comfort of using the anti-lost bracelet; it can ensure that the anti-lost bracelet can still maintain the normal operation of the positioning function and the alarm function when the battery is low, and will not shut down due to rapid power consumption caused by the continuous activation of the positioning function.

[0046] Embodiment 2:

[0047] Based on the anti-lost bracelet provided in the above embodiment 1, the present invention also provides a positioning system for an anti-lost bracelet that can be used to implement the above method, which assists the anti-lost bracelet in completing the positioning process through a Bluetooth gateway and a lost alarm server, thereby further reducing the power consumption of the anti-lost bracelet.

[0048] like Figure 5 As shown, the positioning system provided in this embodiment includes: an anti-lost bracelet, at least one first Bluetooth gateway, at least one second Bluetooth gateway and a lost alarm server. Figure 5 In the example, one first Bluetooth gateway and three second Bluetooth gateways are taken.

[0049] The first Bluetooth gateway is distributed in the first safety range of the anti-lost bracelet wearer, and the second Bluetooth gateway is distributed in the second safety range of the anti-lost bracelet wearer. The first Bluetooth gateway and the second Bluetooth gateway are used to provide current location information to the anti-lost bracelet, and send the positioning information and / or alarm information reported by the anti-lost bracelet to the lost alarm server. Figure 5 In the figure, the solid line shows the first safety range, the dotted line shows the second safety range, and the wearer of the anti-lost bracelet is within the second safety range.

[0050] The lost alarm server is used to receive the positioning information and / or alarm information reported by the anti-lost bracelet or Bluetooth gateway, and determine whether to trigger the alarm based on the positioning information and / or alarm information. In actual implementation, the anti-lost bracelet only needs to report the number of steps, heart rate and positioning information, without complex data processing or reporting a large amount of data, which can reduce the power consumption caused by the data processing and reporting of the anti-lost bracelet.

[0051] In actual implementation, the first safety range is usually a closed place with a limited range, and the wearer is usually close to the accompanying personnel, such as the wearer's residential unit, hospital, teaching building, etc. The risk of getting lost in this safety range is low and it is easy to be found, so positioning can be turned off to minimize the power consumption of the anti-lost bracelet. The second safety range is a limited semi-open place, such as the wearer's residential area, hospital, nursing home, school, etc., which is larger than the first safety range, but the risk of getting lost is also lower. A longer interval time can be used for positioning to reduce the overall positioning power consumption.

[0052] Furthermore, when the wearer is close to a fixed long-term caregiver, the risk of getting lost is also lower. Therefore, a dedicated mobile Bluetooth device carried by a designated caregiver or a general Bluetooth device with specific software installed can be used as the first Bluetooth gateway, and the area near the designated caregiver can be used as the first safety range to follow the designated caregiver, so as to reduce the number of times WiFi positioning or GPS positioning is used outside the fixed safety range and reduce the overall positioning power consumption.

[0053] On the other hand, for security personnel in residential areas, security personnel in hospitals or nursing homes, community workers, community police and other personnel, it may be necessary to assist in the supervision or search for the wearer of the anti-lost bracelet. Therefore, the dedicated mobile Bluetooth devices carried by these personnel or the general Bluetooth devices with specific software installed can be used as the second Bluetooth gateway. When the wearer is outside the safe range and there is no designated accompanying person nearby, if there is a second Bluetooth gateway of this type nearby, the anti-lost bracelet is short-linked with the second Bluetooth gateway, and the anti-lost bracelet sends an alarm message to the nearest second Bluetooth gateway. The second Bluetooth gateway synchronously reports the relevant data of the anti-lost bracelet, such as heart rate, number of steps, body temperature, current location information, etc., thereby further reducing the power consumption of the anti-lost bracelet outside the safe range and facilitating the search for the lost wearer.

[0054] In actual implementation, a smart phone, tablet computer, smart bracelet, etc. with a designated app installed and Bluetooth connection function turned on can be used as a movable first Bluetooth gateway or a movable second Bluetooth gateway.

[0055] When detecting the Bluetooth gateway, the anti-lost bracelet is used as a Bluetooth slave device (also called a Bluetooth peripheral device) and the Bluetooth gateway is used as a Bluetooth master device (also called a Bluetooth central device). When the anti-lost bracelet establishes a connection with the Bluetooth gateway and completes pairing, or the anti-lost bracelet detects that the connection with the Bluetooth gateway is still maintained, it is determined that the Bluetooth gateway is detected and the wearer is within the first safety range or the second safety range. If the connection cannot be established or the connection is established but the pairing is not completed, it is determined that the Bluetooth gateway is not detected and the wearer is outside the safety range.

[0056] In order to distinguish the first security range from the second security range, the Bluetooth gateway includes the Bluetooth gateway type information in the device name field of the Bluetooth connection request message or the pairing key input message, or actively pushes the Bluetooth gateway type information to the anti-lost bracelet after completing the Bluetooth pairing, and informs the anti-lost bracelet of the type of Bluetooth gateway currently connected to through the Bluetooth gateway type information. When the Bluetooth gateway type is the first Bluetooth gateway, the wearer is within the first security range; when the Bluetooth gateway type is the second Bluetooth gateway, the wearer is within the second security range.

[0057] In order to prevent the anti-lost bracelet from automatically connecting to other Bluetooth devices outside the positioning system, causing location confusion or power consumption waste, the anti-lost bracelet and the Bluetooth gateway can be set to only accept connections that require pairing. Both the Bluetooth gateway and the anti-lost bracelet are set to the password input pairing mode (Passkey Entry). The lost alarm server generates a uniform random number as the key (Passkey), which is pre-stored in the anti-lost bracelet and the Bluetooth gateway. When performing Bluetooth gateway detection, the Bluetooth gateway automatically retrieves the key (Passkey) and sends it to the anti-lost bracelet. If the anti-lost bracelet receives the secret key, it indicates that the Bluetooth gateway is the Bluetooth gateway in the positioning system, and the key verification is completed to establish a connection; if the anti-lost bracelet does not receive the secret key, it indicates that the Bluetooth gateway is not the Bluetooth gateway in the positioning system, and pairing and connection are not performed.

[0058] In the positioning system of the anti-lost bracelet provided in this embodiment, different safety ranges are divided by the first Bluetooth gateway and the second Bluetooth gateway, the number of positioning times is reduced within the safety range, and the Bluetooth positioning method with low power consumption is used for positioning and reporting. In actual scenarios, the activity time of the wearer of the anti-lost bracelet within the safety range is usually much longer than the activity time outside the safety range. Therefore, the use of the positioning system provided in this embodiment can significantly reduce the power consumption of the anti-lost bracelet and improve the battery life of the anti-lost bracelet.

[0059] Embodiment 3:

[0060] Based on the anti-lost bracelet provided in the above-mentioned embodiment 1 and the positioning method of the anti-lost bracelet provided in the embodiment 2, the present invention further provides a positioning method of the anti-lost bracelet.

[0061] like Figure 6 As shown, the specific steps of the positioning method of the anti-lost bracelet provided by the embodiment of the present invention are as follows:

[0062] Step 101: The anti-lost bracelet performs Bluetooth gateway detection at a specified time interval to determine whether the wearer of the anti-lost bracelet is in a safe range.

[0063] In the method provided in this embodiment, different positioning strategies are adopted when the wearer of the anti-lost bracelet is in different areas, so as to reduce the number of times the functional modules are turned on as much as possible, or select functional modules with lower power consumption to reduce the overall positioning power consumption.

[0064] The microprocessor of the anti-lost bracelet detects whether it is connected to a Bluetooth gateway at a specified time interval, and detects the type of Bluetooth gateway that has been connected, so as to determine the area the wearer is in. When connected to the first Bluetooth gateway, the wearer is within the first safety range; when connected to the second Bluetooth gateway, the wearer is within the second safety range; when no Bluetooth gateway is detected, the wearer is outside the safety range.

[0065] Furthermore, if the wearer was within the safe range during the last detection, indicating that the risk of getting lost is low, the time interval for the next Bluetooth gateway detection can be longer to reduce power consumption; if the wearer was outside the safe range during the last detection, indicating that the risk of getting lost is high, the time interval for the next Bluetooth gateway detection needs to be shorter to avoid the wearer getting lost.

[0066] Step 102: When located within the first safety range, the anti-lost bracelet obtains the number of steps and heart rate according to the first time window, and issues an alarm based on the number of steps and heart rate.

[0067] When the wearer is within the first safety range, the risk of getting lost is very low, so the anti-lost bracelet does not need to turn on positioning, and the first Bluetooth gateway only needs to regularly report positioning information based on the connection status. However, in this scenario, the wearer still has the risk of sudden illness or accidents, so it is also necessary to monitor the number of steps and heart rate, and alarm when the number of steps and heart rate are abnormal. The monitoring time interval can use a longer first time window, which is usually 5 minutes, to reduce power consumption.

[0068] In the specific implementation, the anti-lost bracelet starts the three-axis acceleration sensor and the heart rate monitoring module according to the period of the first time window, obtains the number of steps and heart rate in the first time window, and then turns off the three-axis acceleration sensor and the heart rate monitoring module to avoid energy consumption caused by the module standby. When the length of the time window changes, the number of steps and heart rate can also be obtained in this way, and only the time length for obtaining the number of steps and heart rate is adjusted.

[0069] Step 103: When located within the second safety range, the anti-lost bracelet obtains the number of steps and heart rate according to the second time window, and uses the Bluetooth module to obtain the current location information, and performs positioning and alarm according to the number of steps, heart rate and current location information.

[0070] When the wearer is within the second safety range, the risk of getting lost is low, but there is a risk that the wearer will move out of the safety range, and the second safety range is larger than the first safety range. Therefore, it is necessary to determine whether positioning is needed based on the number of steps. In this scenario, the number of steps and heart rate are also obtained according to the second time window with a shorter time interval. The second time window is usually 1 minute. If the number of steps is small, it means that the wearer has not moved or has moved a short distance. In this case, the anti-lost bracelet will not turn on positioning, and only the second Bluetooth gateway will actively report positioning information to the lost alarm server; if the number of steps is large, it means that the wearer has moved a long distance, and positioning is performed through the Bluetooth module on the anti-lost bracelet to obtain the wearer's position after moving, and the second Bluetooth gateway will report new positioning information.

[0071] Step 104: When located outside the first safety range and the second safety range, the anti-lost bracelet obtains the number of steps and heart rate according to the second time window, and uses the GPS module or the WiFi module to obtain the current location information, and performs positioning and alarm according to the number of steps, heart rate and current location information.

[0072] If the anti-lost bracelet does not detect any Bluetooth gateway, it means that it is outside the safe area, or in a corner of the room far away from the Bluetooth gateway, such as the bathroom or kitchen, which poses a high security risk. At this time, it is also necessary to use a second time window with a shorter time interval to detect the number of steps and heart rate. Since WiFi positioning or GPS positioning consumes a lot of power, especially indoor 4G signals and GPS signals are often not ideal, frequent activation of positioning will lead to frequent and large amounts of power consumption. Therefore, it is also necessary to use the number of steps and heart rate to determine whether the wearer has moved. If there is no movement, positioning detection can be temporarily omitted; if the position moves, use the GPS module or WiFi module for positioning, and report positioning information and possible alarm information through the 4G module.

[0073] After steps 101 to 104 provided in this embodiment, different positioning strategies can be used to perform positioning and reporting in different scenarios, thereby reducing the energy consumption of the anti-lost bracelet as much as possible and ensuring the safety of the wearer. In actual implementation, the first Bluetooth gateway and the second Bluetooth gateway can use the fixed Bluetooth gateway provided in Example 1, or the movable Bluetooth gateway provided in Example 1.

[0074] In the method provided in this embodiment, the number of steps is used to determine whether the wearer has moved, and then whether the positioning is turned on. On the other hand, when the wearer's heart rate value is too high or too low, positioning or alarming is also required to avoid danger to the wearer. In actual implementation, the step number range and heart rate range for controlling the positioning to be turned on are related to the wearer's mobility, age, health status, etc.

[0075] In a specific scenario, the wearer of the anti-lost bracelet is an elderly person. A healthy elderly person moves about 70 meters for every 100 steps, and an elderly person with limited motor ability moves about 50 to 70 meters for every 100 steps. Therefore, when the number of steps exceeds 100, it can be regarded as the elderly person having left the room or building where he lives in a short period of time. Therefore, 100 steps are set as the upper limit of the step range. When the number of steps in a certain time window exceeds 100 steps, positioning is turned on; when the number of steps in a certain time window is less than 100 steps, positioning is not turned on. At the same time, the heart rate range of the elderly in a quiet state is between 40 beats / minute and 110 beats / minute. If it exceeds this range, positioning or alarm may be turned on. In this embodiment, taking this scenario as an example, the positioning and alarm activation strategy in the method provided in this embodiment is explained.

[0076] like Figure 7 As shown, when located within the second safety range, positioning and alarming can be performed according to the following strategies.

[0077] Step 201: When the number of steps is within the step number range and the heart rate is within the heart rate range, the current position information is not obtained.

[0078] When the number of steps obtained in the second time window is greater than 20 and less than 100, and the heart rate is higher than 40 beats / minute and lower than 110 beats / minute, it indicates that the wearer is no more than 100 meters away from the previous location and no sudden illness or accident has occurred. Positioning detection will not be started, thereby reducing power consumption.

[0079] Step 202: When the number of steps is greater than or equal to the upper limit of the step range and the heart rate is within the heart rate range, the Bluetooth module is used to obtain the current location information, and the positioning information is reported through the Bluetooth module.

[0080] When the number of steps acquired in the second time window is greater than or equal to 100 steps, it indicates that the wearer's moving distance may exceed 100 meters, and the current position may be more than 100 meters away from the previous positioning position. In order to prevent the wearer from getting lost, positioning needs to be turned on. At this time, there is a second Bluetooth gateway around the wearer, so a Bluetooth module with lower power consumption can be used for positioning, and the positioning information is reported to the second Bluetooth gateway through the Bluetooth module. On the other hand, a heart rate higher than 40 beats / minute and lower than 110 beats / minute indicates that the wearer has no sudden illness or accident, and no alarm is needed.

[0081] Step 203: When the number of steps is less than the lower limit of the step range and the heart rate is within the heart rate range, the Bluetooth module is used to obtain the current position information according to the specified period, and the positioning information is reported through the Bluetooth module.

[0082] When the number of steps acquired in the second time window is less than 20 steps, and the heart rate is higher than 40 beats / minute and lower than 110 beats / minute, it indicates that the wearer is in a quiet state, such as sitting quietly or sleeping, and there is no need to turn on positioning. However, in this case, there is also a risk that the wearer will faint or be trapped in a small space. Therefore, periodic positioning is also required so that the accompanying personnel can confirm the wearer's status. In actual implementation, the positioning cycle can be longer, for example, the Bluetooth module performs positioning and reporting once every 15 minutes.

[0083] After steps 201 to 203 provided in this embodiment, positioning and reporting within the second safety range can be completed, and the number of positioning and reporting can be reduced by step detection, thereby reducing the power consumption of the anti-lost bracelet.

[0084] like Figure 8 As shown, when located outside the first safety range and the second safety range, positioning and alarming can be performed according to the following strategies.

[0085] Step 301: The anti-lost bracelet scans the WiFi router and obtains the service set identifier of the WiFi router.

[0086] Since the power consumption of WiFi positioning is lower than that of GPS positioning, when there is a WiFi router around the anti-lost bracelet, WiFi positioning is preferred. The anti-lost bracelet performs WiFi scanning to obtain the service set identifier (SSID) of the surrounding WiFi routers. The SSID identifies the local area network where the WiFi router is located. The lost alarm server can determine the location of the anti-lost bracelet based on the physical area covered by the local area network.

[0087] Step 302: When the WiFi module obtains the service set identifier of one or more WiFi routers, the service set identifier is used as the current location information.

[0088] If the SSID of one or more WiFi routers is obtained, it indicates that the WiFi positioning method is available, and the obtained SSID is directly used as the current location information. However, not all scanned WiFi routers can be connected, so the WiFi router cannot be used directly to report positioning information, and the 4G module needs to be started to report the SSID.

[0089] Step 303: When the WiFi module fails to obtain the service set identifier, the GPS module is used to obtain the current location information.

[0090] If the SSID of the WiFi router is not obtained, GPS positioning must be enabled to obtain the current location information in the GPS positioning signal, and the 4G module must be enabled to report the current location information obtained by GPS positioning.

[0091] Step 304: When the WiFi module fails to obtain the service set identifier and the GPS module fails to obtain the current location information, the number of steps and the heart rate are obtained according to the second time window, and the 4G module is used to issue an alarm according to a specified period.

[0092] If neither the WiFi SSID nor the GPS positioning signal was found in the previous positioning, it means that the wearer is currently in an environment with neither WiFi signal nor GPS satellite signal, and is likely to be in a Faraday cage environment, such as an elevator, underground parking lot, etc. At this time, there may be a risk that the wearer is trapped in the elevator, so it is necessary to increase the intensity of step counting, shorten the time window for heart rate and step detection to 1 minute of the second time window, and periodically alarm, and the alarm period can be set to 10 minutes.

[0093] In a specific implementation, if the time period in which neither the WiFi SSID nor the GPS positioning signal is searched is less than 10 minutes and the number of steps is less than 20, it is determined that the wearer is in a small Faraday cage environment, such as an elevator; if the time period is greater than 10 minutes and the number of steps is greater than 20, it is determined that the wearer is in a larger Faraday cage environment, such as a parking lot.

[0094] After steps 301 to 304 provided in this embodiment, positioning and alarming outside the safe range can be completed, reducing the risk of the wearer getting lost or other risks.

[0095] When the wearer is in an underground parking lot or basement outside the safety range, there is no Bluetooth gateway or WiFi router nearby, and the 4G signal is very weak or even unavailable, so it is impossible to report positioning information and alarm normally. At this time, the Bluetooth module broadcasts the number of steps, heart rate and positioning information through the Bluetooth broadcast packet, so as to broadcast the alarm through the Bluetooth broadcast packet; wherein the Bluetooth broadcast packet includes the number of steps field, the heart rate field and the positioning information field. In the specific implementation, the broadcast data unit (AD Structure) of the Bluetooth broadcast packet can be modified, and data such as the number of steps, heart rate and body temperature can be added to the data field (AD Data), and the data field length (Data Length) can be modified to the corresponding length. The Bluetooth devices of the accompanying personnel or other nearby personnel can receive the Bluetooth broadcast packet, so as to find the wearer of the anti-lost bracelet based on the previous positioning information and the number of steps in the Bluetooth broadcast packet.

[0096] In all the above scenarios, when the number of steps is less than the lower limit of the step range, and the heart rate is greater than the upper limit of the heart rate range or less than the lower limit of the heart rate range, for example: when the number of steps is very low or the steps are not counted, but the heart rate is very high, the wearer may be at risk of a heart attack. At this time, it is necessary to obtain the current location information, perform positioning and alarm based on the current location information, so that the wearer can receive timely treatment.

[0097] Furthermore, in order to ensure continuous operation, the power of the anti-lost bracelet needs to be monitored, and an alarm is sounded when the power is low to remind the wearer or the accompanying person to charge or replace the battery to avoid the anti-lost bracelet running out of power and stopping working. On the other hand, the heart rate monitoring module can detect whether the anti-lost bracelet is worn through infrared light reflection. Therefore, the heart rate monitoring module can also be used to monitor the wearing status of the anti-lost bracelet, and an alarm is sounded when it is not worn for a long time to avoid the risk of loss caused by the wearer not wearing the anti-lost bracelet.

[0098] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-lost bracelet, characterized in that: include: Three-axis acceleration sensor, heart rate monitoring module, Bluetooth module, GPS module, 4G module and microprocessor, including: The three-axis acceleration sensor is used to obtain the number of steps of the wearer of the anti-lost bracelet; The heart rate monitoring module is used to monitor the heart rate of the wearer of the anti-lost bracelet; The Bluetooth module is used to obtain the current location information according to the location of the Bluetooth gateway, and report the positioning information and / or alarm information through the Bluetooth gateway; The 4G module is used to report positioning information and / or alarm information using 4G communication; The GPS module is used to obtain current location information based on GPS data; The microprocessor is used to start the corresponding module to obtain the number of steps, heart rate or current position information according to the specified time window, and start the corresponding module to report positioning information and / or alarm information according to one or more of the number of steps, heart rate and current position information.

2. The anti-lost bracelet according to claim 1, characterized in that: The anti-lost bracelet also includes a WiFi module, which is used to obtain current location information according to the location of the WiFi router and report positioning information and / or alarm information through the WiFi router.

3. The anti-lost bracelet according to claim 1, characterized in that: The anti-lost bracelet also includes an alarm module, which is used to issue an alarm based on one or more of the number of steps, heart rate and current location information.

4. A positioning system for an anti-lost bracelet, characterized in that: include: The anti-lost bracelet, at least one first Bluetooth gateway, at least one second Bluetooth gateway and the lost alarm server according to any one of claims 1 to 3, specifically comprising: The first Bluetooth gateway is distributed in a first safety range of the wearer of the anti-lost bracelet, and the second Bluetooth gateway is distributed in a second safety range of the wearer of the anti-lost bracelet. The first Bluetooth gateway and the second Bluetooth gateway are used to provide the anti-lost bracelet with current location information, and send the positioning information and / or alarm information reported by the anti-lost bracelet to the lost alarm server; The lost alarm server is used to receive the positioning information and / or alarm information reported by the anti-lost bracelet or the Bluetooth gateway, and determine whether to trigger an alarm based on the positioning information and / or alarm information.

5. A method for locating an anti-lost bracelet, characterized in that: Using the positioning system described in claim 4 to perform positioning comprises: The anti-lost bracelet performs Bluetooth gateway detection at specified time intervals to determine whether the wearer of the anti-lost bracelet is in a safe range; When it is within the first safety range, the anti-lost bracelet obtains the number of steps and heart rate according to the first time window, and issues an alarm based on the number of steps and heart rate; When it is within the second safety range, the anti-lost bracelet obtains the number of steps and heart rate according to the second time window, and uses the Bluetooth module to obtain the current location information, and locates and alarms according to the number of steps, heart rate and current location information; When located outside the first safety range and the second safety range, the anti-lost bracelet obtains the number of steps and heart rate according to the second time window, and uses the GPS module or WiFi module to obtain the current location information, and performs positioning and alarm according to the number of steps, heart rate and current location information.

6. The positioning method of the anti-lost bracelet according to claim 5, characterized in that: The anti-lost bracelet obtains the number of steps and heart rate according to the first time window, specifically including: The anti-lost bracelet starts the three-axis acceleration sensor and the heart rate monitoring module according to the cycle of the first time window, obtains the number of steps and the heart rate in the first time window, and then turns off the three-axis acceleration sensor and the heart rate monitoring module.

7. The positioning method of the anti-lost bracelet according to claim 5, characterized in that: When the user is within the second safety range, the Bluetooth module is used to obtain the current location information, and positioning and alarming are performed according to the number of steps, heart rate and current location information, specifically including: When the number of steps is within the step range and the heart rate is within the heart rate range, the current location information is not obtained; When the number of steps is greater than or equal to the upper limit of the step range and the heart rate is within the heart rate range, the Bluetooth module is used to obtain the current location information and report the positioning information through the Bluetooth module; When the number of steps is less than the lower limit of the step range and the heart rate is within the heart rate range, the Bluetooth module is used to obtain the current location information according to the specified period, and the positioning information is reported through the Bluetooth module.

8. The positioning method of the anti-lost bracelet according to claim 5, characterized in that: When the user is outside the first safety range and the second safety range, obtaining the current location information by using the GPS module or the WiFi module specifically includes: The anti-lost bracelet scans the WiFi router and obtains the service set identifier of the WiFi router; When the WiFi module obtains the service set identifier of one or more WiFi routers, the service set identifier is used as the current location information; When the WiFi module fails to obtain the service set identifier, the GPS module is used to obtain the current location information; When the WiFi module fails to obtain the service set identifier and the GPS module fails to obtain the current location information, the number of steps and the heart rate are obtained according to the second time window, and the 4G module is used to issue an alarm according to a specified period.

9. The positioning method of the anti-lost bracelet according to claim 5, characterized in that: The method further comprises: The Bluetooth module broadcasts the number of steps, heart rate and positioning information through a Bluetooth broadcast packet, so as to broadcast an alarm through the Bluetooth broadcast packet; wherein the Bluetooth broadcast packet includes a step number field, a heart rate field and a positioning information field.

10. The positioning method of the anti-lost bracelet according to claim 5, characterized in that: The method further comprises: When the number of steps is less than the lower limit of the step range, and the heart rate is greater than the upper limit of the heart rate range or less than the lower limit of the heart rate range, the current location information is obtained, and positioning and alarm are performed based on the current location information.

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