A method and system for alerting an area under maintenance

Abstract

The application provides a kind of warning method for maintenance area, comprising: determining dangerous area in maintenance area, the maintenance area is provided with UWB base station corresponding to maintenance equipment;The position information of monitoring personnel is sent to UWB base station in real time;Personnel position is determined based on the position information received by the UWB base station and the waveform information of signal emission wave of UWB base station;Whether the determined personnel position is in the determined dangerous area is judged, to issue alarm signal to give danger prompt.The application determines personnel position based on the position information received by the UWB base station and the waveform information of signal emission wave of UWB base station, can accurately monitor the safety distance between personnel and maintenance vehicle, when maintenance personnel enters dangerous area, maintenance personnel and operator receive the alarm prompt of equipment simultaneously, can effectively warn the safety of both sides, and further avoid the occurrence of danger.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless sensor networks, and particularly relates to an alarm method and alarm system for a maintenance area. BACKGROUND

[0002] The construction environment of highways, railways and tunnels is harsh and dangerous, and the number of workers is large, which makes the construction enterprise face great management difficulties, and an efficient and accurate personnel management and safety management system is urgently needed. In general, this demand mainly includes personnel and vehicle attendance, tracking and positioning, optimization and deployment, post-disaster first aid, daily management, etc. The core of the realization of these management needs is the real-time tracking and positioning of personnel. Traditional RFID and WiFi technology can position the on-site construction workers within a certain range, but cannot obtain the accurate position of the personnel in real time, and the construction amount is large and the debugging is complex, which cannot meet the actual needs of railway enterprises for personnel positioning.

[0003] In the related art, a high-precision positioning system for underground operation personnel is disclosed, which comprises a positioning server on the ground and a detection device in the underground tunnel. The positioning server is provided with a positioning database. The detection device comprises a plurality of positioning AP sub-stations. The positioning database pre-stores the calibration characteristic parameters of each grid point on the underground tunnel space grid. The positioning terminal carried by the underground operation personnel sends a detection signal containing the ID of the positioning terminal in real time. The positioning AP sub-stations in the receiving range receive the detection signal, obtain the real-time characteristic parameters of the detection signal and send them to the positioning server. The positioning server obtains the accurate position of the positioning terminal in the underground tunnel according to the comparison result of the real-time characteristic parameters and the calibration characteristic parameters of each grid point in the positioning database. This technology mainly uses the positioning server on the ground and the detection device in the underground tunnel to realize positioning, and the detection signal data transmission is realized through a wired network. The general applicability is poor, the applicable field is limited, and it cannot be applied to the maintenance area or construction area of highway maintenance. In addition, there is still a lot of room for improvement in high-precision positioning, the influence of signal transmission reliability on positioning accuracy and data accuracy, etc.

[0004] Therefore, it is necessary to provide an alarm method and alarm system for a maintenance area to solve the above problems. SUMMARY

[0005] The purpose of the present application is to solve the technical problems in the prior art that the safety distance between personnel and maintenance vehicles cannot be monitored, and the positioning accuracy is reduced due to the position of the antenna array, the signal transmission process being blocked by building obstructions, and non-line-of-sight environment and other influencing factors.

[0006] The application provides a warning method for a maintenance area, comprising: determining a dangerous area in the maintenance area, wherein the maintenance area is provided with a UWB base station corresponding to a maintenance device; monitoring position information of a person and sending the position information to the UWB base station in real time; determining the position of the person based on the position information received by the UWB base station and the waveform information of the signal transmission wave of the UWB base station; and determining whether the determined position of the person is in the determined dangerous area to send a warning signal for danger prompt.

[0007] According to an optional embodiment of the application, the determination of the position of the person based on the position information received by the base station and the waveform information of the signal transmission wave of the base station comprises: the UWB base station comprises a first UWB base station and a second UWB base station; and the strongest waveform path is selected from the waveform information of the signal transmission wave of the first UWB base station and the second UWB base station respectively to determine the position of the person.

[0008] According to an optional embodiment of the application, further comprising: calculating a first time difference of sending the position information to the first UWB base station and the position information received by the first UWB base station; and calculating a second time difference of information sending and receiving between the first UWB base station and the second UWB base station.

[0009] According to an optional embodiment of the application, in the case that the first time difference and the second time difference are both shortest, the strongest waveform path in the waveform information of the first UWB base station and the second UWB base station is selected to determine the first distance and the second distance between the person and the first UWB base station and the second UWB base station.

[0010] According to an optional embodiment of the application, the determination of the dangerous area in the maintenance area comprises: an area surrounded by a circle with a radius R and taking the maintenance device as the center is set as the dangerous area, wherein the radius R is 2.2m-3.2m.

[0011] According to an optional embodiment of the application, the determination of whether the determined position of the person is in the determined dangerous area to send a warning signal for danger prompt comprises: the determination of whether the determined position of the person is in the area surrounded by the circle with the radius R and taking the maintenance device as the center; and the sending of a first-level alarm to the person and an operator of the maintenance device simultaneously when it is determined that the person is in the area.

[0012] According to an optional embodiment of the present application, the step of judging whether the determined personnel position is in the determined dangerous area to send an alarm signal to give a danger prompt comprises: when it is judged that the determined personnel position is in the area surrounded by the circle with the maintenance equipment as the center and with the radius R, and the distance between the personnel position and the center of the maintenance equipment is less than the specified distance, sending a secondary alarm to the personnel and simultaneously notifying the operator in the maintenance equipment to stop construction.

[0013] According to an optional embodiment of the present application, the method further comprises: when it is judged that the determined personnel position is not in the dangerous area, giving a voice notification to the personnel that the personnel position is not in the dangerous area, and continuing to send the position information to each UWB base station in real time.

[0014] In addition, the second aspect of the present application also provides an alarm system, which comprises a processor unit, a communication unit, an alarm unit, a power supply unit, a first distance detection unit (UWB base station) and a second distance detection unit (UWB tag), wherein the processor unit is configured to receive the position data of the communication unit, the first distance detection unit and the second distance detection unit, send control instructions to each unit, and be connected with the power supply unit, the communication unit, the alarm unit and the distance detection unit; the communication unit is configured to receive the instructions of the processor unit and send them to other devices, and send the received information data to the processor unit for processing; the alarm unit is configured to receive the control instructions of the processor unit, and send an alarm to give a danger prompt when it is judged that the determined personnel position is in the determined dangerous area; the first distance detection unit (UWB base station) is configured to receive the distance information of the maintenance equipment and other devices, and send the distance information to the processor unit; and the second distance detection unit (UWB tag) is configured to send the position information of the personnel to the first detection unit.

[0015] According to an optional embodiment of the present application, the UWB base station comprises a first UWB base station and a second UWB base station; and the processor unit is further configured to select the strongest waveform path from the waveform information of the signal emission waves of the first UWB base station and the second UWB base station respectively to determine the personnel position.

[0016] Advantages

[0017] Compared with the prior art, the present application can accurately position the position of the personnel, accurately monitor the safety distance between the personnel and the maintenance vehicle, effectively avoid the problems of reduced positioning accuracy caused by the position of the antenna array, the signal transmission process being blocked by the building shelter, and the influence factors such as non-line-of-sight environment, etc., by monitoring the position information of the personnel, and transmitting the position information to the UWB base station in real time, and determining the position of the personnel based on the position information received by the UWB base station and the waveform information of the signal transmission wave of the UWB base station; by judging whether the determined position of the personnel is in the determined dangerous area, an alarm signal is sent to prompt the danger, so that the maintenance personnel and the operator can simultaneously receive the alarm prompt of the equipment, the safety warning of both parties can be effectively carried out, and the occurrence of danger can be avoided.

[0018] In addition, compared with the prior art, the device carried by the maintenance vehicle and the device worn by the personnel in the alarm system of the present application are small and portable, have low power consumption and low power, are widely applied, can effectively guarantee the long-time construction operation of the personnel, can guarantee high-precision and high-speed data transmission, can more timely and accurately provide alarm information to the maintenance personnel, and improve the safety of the personnel. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to make the technical problems solved by the present application, the technical means adopted and the technical effects obtained more clear, specific embodiments of the present application will be described in detail below with reference to the drawings. However, it should be stated that the drawings described below are only the drawings of exemplary embodiments of the present application, and for those skilled in the art, other drawings of embodiments can be obtained from these drawings without creative labor.

[0020] Figure 1 is a flowchart of an example of the alarm method for the maintenance area of the present application.

[0021] Figure 2 is a schematic diagram of an example of the alarm method for the maintenance area of the present application.

[0022] Figure 3 is Figure 2 is a schematic diagram of the position relationship between the UWB base station and the personnel in the present application.

[0023] Figure 4 is a schematic diagram of the principle of the alarm method for the maintenance area of the present application.

[0024] Figure 5 is a flowchart of another example of the alarm method for the maintenance area of the present application.

[0025] Figure 6 is a structural block diagram of an example of the alarm system for the maintenance area of the present application. DETAILED DESCRIPTION

[0026] Example embodiments of the present application will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept to those skilled in the art. Like reference numerals refer to like elements throughout the specification.

[0027] In the case of specific embodiments described in accordance with the technical concept of the present application, features, structures, characteristics or other details described in a certain embodiment can not exclude the possibility of being combined in one or more other embodiments in a suitable manner.

[0028] In the description of the specific embodiments, features, structures, characteristics or other details described in the present application are intended to enable those skilled in the art to sufficiently understand the embodiments. However, it is not excluded that one or more of the features, structures, characteristics or other details can not be practiced by those skilled in the art without the specific feature, structure, characteristic or other detail.

[0029] The flowcharts shown in the drawings are only exemplary illustrations, and do not necessarily include all contents and operations / steps, nor are they necessarily executed in the order described. For example, some operations / steps can be further divided, and some operations / steps can be combined or partially combined, so that the actual execution order can be changed according to the actual situation.

[0030] The block diagrams shown in the drawings are only functional entities, and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0031] It should be understood that although first, second, third, etc. denoting adjectives can be used herein to describe various devices, elements, components or parts, this should not be limited by these adjectives. These adjectives are used to distinguish one from another. For example, a first device can also be referred to as a second device without departing from the essential technical solution of the present application.

[0032] The term "and / or" or "and / or" includes all combinations of any one and one or more of the associated listed items.

[0033] In view of the above problems, the present application provides an alarm method for a maintenance area, which can accurately determine the position of personnel, accurately monitor the safety distance between personnel and maintenance vehicles, effectively avoid the problems of reduced positioning accuracy caused by factors such as the position of the antenna array, the shielding of the signal transmission process by building obstructions, and non-line-of-sight environments, and the like, by monitoring the position information of personnel, and transmitting the position information to the UWB base station in real time, and determining the position of personnel based on the position information received by the UWB base station and the waveform information of the signal transmission wave of the UWB base station; by judging whether the determined position of personnel is in the determined dangerous area, an alarm signal is sent to give a danger prompt, which can enable the maintenance personnel and the operator to simultaneously receive the alarm prompt of the equipment, can effectively give a safety warning to both parties, and thus avoid the occurrence of danger.

[0034] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings.

[0035] Embodiment 1

[0036] The following will refer to Figures 1 to 5 Embodiments of the alarm method for a maintenance area of the present application will be described.

[0037] Figure 1 is a flowchart of an example of the alarm method for a maintenance area of the present application.

[0038] As Figure 1 shown, the method comprises the following steps.

[0039] Step S101, determining a dangerous area in a maintenance area, wherein the maintenance area is provided with a UWB base station corresponding to a maintenance device.

[0040] Step S102, monitoring the position information of personnel, and transmitting the position information to the UWB base station in real time.

[0041] Step S103, determining the position of personnel based on the position information received by the UWB base station and the waveform information of the signal transmission wave of the UWB base station.

[0042] Step S104, judging whether the determined position of personnel is in the determined dangerous area, to send an alarm signal to give a danger prompt.

[0043] Figure 2 is a schematic diagram of an example of the alarm method for a maintenance area of the present application. The alarm method of the present application will be specifically described below with reference to the example of Figure 2

[0044] As Figure 2 ​As shown, in a rectangular maintenance area, there are two maintenance vehicles (i.e., maintenance equipment) and multiple maintenance or construction personnel. The rectangular maintenance area is, for example, a rectangle with a width of 8m and a length of 1000m. The maintenance vehicles are equipped with corresponding UWB base stations (i.e., first distance detection units). In addition, maintenance and construction personnel also carry distance detection units (i.e., second distance detection units, also known as "UWB tags").

[0045] First, in step S101, a hazardous area is identified within the maintenance area, wherein a UWB base station corresponding to the maintenance equipment is installed in the maintenance area.

[0046] Specifically, the area enclosed by a circle with radius R centered on the maintenance equipment is designated as the danger zone.

[0047] Preferably, the radius R of the danger zone is 2m to 3.2m.

[0048] exist Figure 2 In the example shown, the area enclosed by a circle with radius R centered on the maintenance vehicle is designated as the danger zone, where radius R is 2.5m.

[0049] Furthermore, a circular area with a radius R of 2.5m is designated as a danger zone.

[0050] It should be noted that the radius R is 2.5m in this embodiment. However, it is not limited to this and can also be 2.0m, 3.0m, 3.2m, etc. in other embodiments.

[0051] Specifically, in this embodiment, the UWB base station includes a first UWB base station and a second UWB base station.

[0052] It should be noted that the above is only an optional example and should not be construed as a limitation of the present invention.

[0053] Next, in step S102, the location information of the personnel is monitored and the location information is sent to the UWB base station in real time.

[0054] Specifically, for example, the location information of personnel is monitored by a second distance detection unit, and the location information is sent to the UWB base station in real time.

[0055] exist Figure 2 In the example shown, the first distance detection unit (UWB base station) of the maintenance vehicle is turned on, and the second distance detection unit (UWB tag) wearing distance detection equipment, such as maintenance personnel and construction workers, is activated.

[0056] Further, when the second distance detection unit (UWB tag) is activated, the position information is sent to the first distance detection unit (UWB base station) in real time, and the position information is further processed to determine the position of the personnel.

[0057] Optionally, the position information can also be sent to the first distance detection unit (UWB base station) in a time manner.

[0058] It should be noted that the above is only described as an optional example and cannot be understood as a limitation of the present application.

[0059] Next, in step S103, the position of the personnel is determined based on the position information received by the UWB base station and the waveform information of the signal transmission wave of the UWB base station.

[0060] Specifically, the position of the personnel is determined based on the position information received by the UWB base station 1 (i.e., the first UWB base station) and the UWB base station 2 (the second UWB base station), and the waveform information of the signal transmission wave of the UWB base station 1 and the UWB base station 2, which can be referred to in the following. Figure 3 .

[0061] It should be noted that the core theory of the AOA algorithm is to calculate the time difference received by different antennas (where the signal energy of the wireless communication electromagnetic wave is radiated into the air by the antenna at the transmitting end and is received by the antenna at the receiving end), that is, when the Bluetooth chip opens the carrier amplitude and phase transmission values of the Bluetooth radio frequency end, the signal arrival angle direction is calculated using the I / Q (phase value) values according to different antenna array designs, and then the accurate position of the transmitting end can be determined through two different receiving ends. However, in actual scenarios, there are a large number of building obstructions, for example, building obstructions in the maintenance area. The signal is transmitted in a non-line-of-sight manner in the presence of building obstructions, and the signal has a "shadow effect".

[0062] In order to avoid the problems of reduced positioning accuracy caused by the position of the antenna array, the signal transmission process being blocked by the building obstruction, and the path being affected in a non-line-of-sight environment, the present application uses a RAOA positioning algorithm (Restructure Angle of Arrival, RAOA) based on the reconstruction idea, wherein it is assumed that the transmission waves of the measured point are uniformly distributed on a disc with the measured point as the center and D as the radius, the scattered waves of the transmission waves all need to pass through a uniformly distributed scatterer (S) to reach the base station, and the strongest path is selected as the waveform path of the reconstruction idea, because the waveform carried by the strongest path has the most effective information, and the path has the best characteristics in a non-line-of-sight environment.

[0063] Specifically, the strongest waveform path is selected from the waveform information of the signal transmission wave of the first UWB base station and the second UWB base station to determine the position of the personnel.

[0064] It should be noted that in the present application, "selecting the strongest waveform path" means that by carefully controlling the relative delay and amplitude between the wave sources, the energy of the electromagnetic wave radiation is concentrated in one direction (i.e. the position of the receiving end), and the electromagnetic wave radiation energy is small in other places. The strongest waveform path is the path with the smallest signal attenuation from the sending end to the receiving end position. The direction of the antenna radiation can be realized by changing the relative delay and amplitude between the wave sources to accurately track the change of the relative position between the sending end and the receiving end. For details, please refer to Figure 4 .

[0065] Figure 4 The control process of signals in different directions is shown. Specifically, the signal from the target path is amplified, and then the angle of arrival (i.e. the angle of arrival of the signal in different directions) is determined according to the information intensity in different directions (i.e. α1 and α2 in Figure 3 ).

[0066] Specifically, under the condition that the positions of the first UWB base station and the second UWB base station are known, the signal sent by the personnel device (i.e. the second distance detection unit or the UWB tag) arrives at the two nodes (i.e. the positions of the first UWB base station and the second UWB base station) which have been positioned, the first included angle α1 between the line connecting the first UWB base station and the personnel device and the reference direction, and a ray L1 is drawn based on this direction; similarly, the second included angle α2 between the line connecting the second UWB base station and the personnel device and the reference direction, and a ray L2 is drawn based on this direction, then the intersection of the ray L1 and the ray L2 is the angle of arrival position of the device.

[0067] Further, the first time difference between the sending of the position information to the first UWB base station and the receiving of the position information by the first UWB base station is calculated; and the second time difference between the sending and receiving of information between the first UWB base station and the second UWB base station is calculated.

[0068] Preferably, in the case where the first time difference and the second time difference are both the shortest, the strongest waveform path in the waveform information of the first UWB base station and the second UWB base station is selected to determine the first distance and the second distance between the personnel and the first UWB base station and the second UWB base station.

[0069] Further, the personnel position is calculated according to the calculated first distance and second distance. For the calculation of the personnel position, the coordinates of the first UWB base station are marked as (x1, y1), the coordinates of the second UWB base station are marked as (x2, y2), and the coordinates of the measured node (i.e. the personnel position) are (x, y). Assuming that neither α1 nor α2 is 90°, the straight line equations of the two rays are y-y1=k1(x-x1) and y-y2=k2(x-x2), where k1=tan(α1) and k2=tan(α2).

[0070]

[0071] Solve the intersection coordinates of two rays:

[0072]

[0073] According to the above expression (1), the coordinates (x, y) of the personnel position are obtained.

[0074] In an embodiment, assuming that the coordinates of the first UWB base station are (0, 0), the coordinates of the second UWB base station are (1, 0), α1 = 30°, and α2 = 120°, the specific calculation process is as follows:

[0075] x1 = 0, y1 = 0; x2 = 1, y2 = 0; α1 = 30, α2 = 120; k1 = tan(α1 / 180π); k2 = tan

[0076] (α2 / 180π);

[0077] x = (k1x1-k2x2-y1+y2) / (k1-k2), y = (k1k2(x1-x2)-k2y1+k1y2) / (k1-k2)

[0078] The calculation result is x = 0.750, y = 0.433.

[0079] Therefore, the coordinates of the personnel position are (x, y) = (0.75, 0.433).

[0080] Thus, by calculating the personnel position in the above manner, the signal transmission reliability can be improved, and problems such as reduced positioning accuracy caused by factors such as the position of the antenna array, the shielding of the signal transmission process by a building shielding object, and a non-line-of-sight environment can be effectively avoided.

[0081] It should be noted that the above is only described as an optional example and cannot be understood as a limitation of the present application.

[0082] Next, in step S104, it is determined whether the determined personnel position is in the determined dangerous area to issue an alarm signal for danger prompt.

[0083] Specifically, it is determined whether the determined personnel position is in the area surrounded by the circle with the maintenance device as the center and with a radius R (i.e., the circular dangerous area shown in FIG. 1). Figure 2

[0084] In an embodiment, when it is determined to be in the area, a first-level alarm is sent to the personnel and the operator in the maintenance device at the same time.

[0085] ​In another embodiment, in the case of judging that the determined personnel position is in the area surrounded by the circle with the maintenance equipment as the center and with the radius R, and the distance between the personnel position and the center of the maintenance equipment is less than the specified distance, a secondary alarm is issued to the personnel, and the operator in the maintenance equipment is informed to stop construction at the same time.

[0086] In yet another embodiment, in the case of judging that the determined personnel position is not in the dangerous area, a voice notification of not being in the dangerous area is made to the personnel, and the sending of the position information to each UWB base station is continued in real time.

[0087] Figure 5 is a flowchart of another example of the alarm method for a maintenance area of the present application.

[0088] In Figure 5 In the example shown, the alarm method includes the following steps.

[0089] Step S501, turn on the base station device and the personnel device.

[0090] It should be noted that in the present application, the first UWB base station and the second UWB base station device are also referred to as "base station device", and the personnel device is also referred to as "tag device".

[0091] Step S502, the tag device sends position information to the base station device.

[0092] Step S503, the base station device receives the position information and sends it to the controller;

[0093] Step S504, judge whether it is in the dangerous area.

[0094] Specifically, if it is in the dangerous area, the base station device alarms and informs the personnel wearing the tag device located in the dangerous area (S5041).

[0095] If it is not in the dangerous area, the tag device is informed to continue sending position information (S5042). Specifically, it includes timed sending and real-time sending, in the case of timed sending, the tag device is informed to wait for a time T, and sends the position information after the waiting time T.

[0096] Step S505, further judge whether the tag device has left the dangerous area, wherein if it is judged that the tag device has left the dangerous area, the alarm operation of the base station device is turned off, and step S5042 is continued to be executed, and the tag device continues to send position information to the base station device.

[0097] If it is judged that the tag device has not left the dangerous area, the base station device continues to alarm.

[0098] It should be noted that the above is described only as an optional example and cannot be understood as a limitation to the present application.

[0099] Compared with the prior art, the present application can accurately position the position of the personnel, accurately monitor the safety distance between the personnel and the maintenance vehicle, effectively avoid the problems of reduced positioning accuracy caused by the position of the antenna array, the signal transmission process being blocked by the building shelter, and the non-line-of-sight environment, and the like, by monitoring the position information of the personnel, and transmitting the position information to the UWB base station in real time, and determining the position of the personnel based on the position information received by the UWB base station and the waveform information of the signal transmission wave of the UWB base station; by judging whether the determined position of the personnel is in the determined dangerous area, an alarm signal is sent to give a danger prompt, which can make the maintenance personnel and the operator simultaneously receive the alarm prompt of the equipment, effectively give a safety warning to both parties, and thus avoid the occurrence of danger.

[0100] Embodiment 2

[0101] Figure 6 is a structural block diagram showing an example of the alarm system of the present application.

[0102] As Figure 6 shown, the present application further provides an alarm system, which comprises a processor unit, a communication unit, an alarm unit, a power supply unit, a first distance detection unit (UWB base station) 5, and a second distance detection unit (UWB tag) 6.

[0103] In Figure 6 the example, the equipment carried by the maintenance vehicle and the personnel wearing equipment both comprise a processor unit, a communication unit, an alarm unit, and a power supply unit, wherein the UWB equipment comprises a processor unit 1, a communication unit 2, an alarm unit 3, a power supply unit 4, and a first distance detection unit (UWB equipment or UWB base station); and the personnel wearing equipment comprises a processor unit 1', a communication unit 2', an alarm unit 3', a power supply unit 4', and a second distance detection unit (UWB equipment or UWB base station) 6.

[0104] It should be noted that, since the functions of the processor unit, the communication unit, the alarm unit, and the power supply unit in the equipment carried by the maintenance vehicle and the personnel wearing equipment are the same, only the description of the units in the equipment carried by the maintenance vehicle is given, and the description of the units with the same functions in the personnel wearing equipment is omitted.

[0105] Specifically, the processor unit 1 is configured to receive information transmitted by the communication unit 2, position data of the first distance detection unit 5 and the second distance detection unit 6, and send control instructions to each unit, and is connected with the power unit 4, the communication unit 2, the alarm unit 3 and the distance detection unit; the communication unit 2 is configured to receive instructions of the processor unit 1 and send to other devices, and send received information data to the processor unit 1 for processing.

[0106] Further, the alarm unit 3 is configured to receive control instructions of the processor unit 1, and issue a danger prompt when it is determined that the determined personnel position is in the determined dangerous area.

[0107] For the dangerous area in the maintenance area, an area surrounded by a circle with a radius R of 2.2m-3.2m and taking the maintenance device as the center is set as the dangerous area.

[0108] Preferably, the first distance detection unit (UWB base station) 5 is configured to receive distance information between the maintenance device and other devices, and send the distance information to the processor unit.

[0109] Further, the second distance detection unit (UWB tag) 6 is configured to send position information of personnel to the first detection unit 5.

[0110] Optionally, the UWB base station includes a first UWB base station and a second UWB base station.

[0111] Specifically, the processor unit 1 is further configured to select the strongest waveform path from waveform information of signal emission waves of the first UWB base station and the second UWB base station respectively, to determine the personnel position.

[0112] Further, a first time difference of sending position information to the first UWB base station and receiving the position information by the first UWB base station is calculated; and a second time difference of sending and receiving information between the first UWB base station and the second UWB base station is calculated.

[0113] In a preferred embodiment, in the case that the first time difference and the second time difference are both shortest, the strongest waveform path in the waveform information of the first UWB base station and the second UWB base station is selected to determine the first distance and the second distance between the personnel and the first UWB base station and the second UWB base station.

[0114] Further, the personnel position is calculated according to the calculated first distance and second distance. For the calculation of the personnel position, the coordinates of the first UWB base station are marked as (x1, y1), the coordinates of the base station 2 are marked as (x2, y2), and the coordinates of the measured node (i.e. the personnel position) are (x, y). Assuming that neither a1 nor a2 is 90°, the straight line equations of the two rays are y-y1=k1(x-x1) and y-y2=k2(x-x2), wherein k1=tan(a1) and k2=tan(a2).

[0115]

[0116] Solve the intersection coordinates of the two rays:

[0117]

[0118] According to the above expression (1), the coordinates (x, y) of the personnel position are obtained.

[0119] Next, it is determined whether the determined personnel position is in the area surrounded by the circle with the maintenance equipment as the center and with the radius R. When it is determined that the personnel position is in the area, a first-level alarm is sent to the personnel and the operator in the maintenance equipment.

[0120] When it is determined that the determined personnel position is in the area surrounded by the circle with the maintenance equipment as the center and with the radius R, and the distance between the personnel position and the center of the maintenance equipment is less than the specified distance, a second-level alarm is sent to the personnel, and the operator in the maintenance equipment is notified to stop construction.

[0121] In another embodiment, when it is determined that the determined personnel position is not in the dangerous area, a voice notification of not being in the dangerous area is sent to the personnel, and the position information is continuously sent to each UWB base station in real time.

[0122] It should be noted that the same parts as in Example 1 are omitted in Example 2.

[0123] Compared with the prior art, the device carried by the maintenance vehicle and the device worn by the personnel in the alarm system of the present application are small and portable, have low power consumption and low power, are widely applicable, can effectively protect the personnel from long-time construction operation, can ensure high-precision and high-speed data transmission, can provide alarm information to the maintenance personnel more timely and accurately, and can improve the safety of the personnel.

[0124] The above-described specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that various general devices can also implement the present application. The above-described specific embodiments are merely for the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for alerting of a maintenance area, characterized in that, Comprising: The maintenance equipment in the maintenance area is equipped with corresponding UWB base stations, and the area surrounded by a circle with the maintenance equipment as the center and a radius R determines a dangerous area in the maintenance area; The corresponding UWB base stations of the maintenance equipment are turned on, and the UWB tags of the personnel in the maintenance area are activated to monitor the position information of the personnel and send the position information to the UWB base stations in real time or at a fixed time by the UWB tags; Based on the position information received by each UWB base station and the waveform information of the signal transmission wave of each UWB base station, the position of the personnel is determined, comprising: Selecting the strongest waveform path from the waveform information of the signal transmission wave of each UWB base station respectively; Wherein, based on changing the relative delay and amplitude between the wave sources to control the radiation direction of the antenna to track the change of the relative position between the transmission end and the receiving end, the relative delay and amplitude between the wave sources are controlled to concentrate the electromagnetic wave radiation energy at the receiving end position, the signal from the target path is strengthened and amplified, and then the arrival angle is determined according to the information intensity in different directions, the time difference between sending the position information to each UWB base station and receiving the position information by each UWB base station is calculated, and in the case that the time difference is the shortest, the path with the smallest signal attenuation from the transmission end to the receiving end position in the waveform information of the signal of each UWB base station is selected as the strongest waveform path, the distances between the personnel and each UWB base station are determined, and the position of the personnel is calculated using the reconstructed RAOA positioning algorithm according to the distances; Determine whether the determined personnel position is in the determined dangerous area, and if so, issue an alarm signal for multi-level danger prompt.

2. The alerting method of claim 1, wherein, Based on the position information received by the base station and the waveform information of the signal transmission wave of the base station, the position of the personnel is determined, further comprising: The UWB base station comprises a first UWB base station and a second UWB base station; Select the strongest waveform path from the waveform information of the signal transmission wave of the first UWB base station and the second UWB base station respectively to determine the position of the personnel.

3. The alerting method of claim 2, wherein, Further comprising: Calculate the first time difference between sending the position information to the first UWB base station and receiving the position information by the first UWB base station; Calculate the second time difference between information sending and receiving between the first UWB base station and the second UWB base station.

4. The alerting method of claim 3, wherein, Further comprising: In the case that the first time difference and the second time difference are the shortest, select the strongest waveform path in the waveform information of the first UWB base station and the second UWB base station to determine the first distance and the second distance between the personnel and the first UWB base station and the second UWB base station.

5. The alarm method according to claim 4, wherein: The radius R is 2.2m-3.2m.

6. The alerting method of claim 5, wherein, Determine whether the determined personnel position is in the determined dangerous area, and if so, issue an alarm signal for multi-level danger prompt, comprising: Determine whether the determined personnel position is in the area surrounded by a circle with the maintenance equipment as the center and a radius R; When it is determined that the personnel position is in the area, send a first-level alarm to the personnel and the operator of the maintenance equipment simultaneously.

7. The alerting method of claim 5, wherein, Determine whether the determined personnel position is in the determined dangerous area, and if so, issue an alarm signal for multi-level danger prompt, further comprising: If the determined personnel position is within the area surrounded by the circle with the maintenance equipment as the center and the radius R, and the distance between the personnel position and the center of the maintenance equipment is less than the specified distance, a secondary alarm is sent to the personnel, and the operator in the maintenance equipment is informed to stop construction.

8. The alerting method of claim 5, wherein, Also included are: If the determined personnel position is not within the dangerous area, a voice notification is sent to the personnel that the personnel position is not within the dangerous area, and the position information is continuously sent to each UWB base station in real time.

9. An alarm system characterized by Included are: The processor unit, the communication unit, the alarm unit, the power unit, the first distance detection unit, the second distance detection unit; The processor unit is used to receive the position data of the communication unit, the first distance detection unit, and the second distance detection unit, and send control instructions to each unit, and is connected to the power unit, the communication unit, the alarm unit, and the distance detection unit; The communication unit is used to receive the instructions of the processor unit and send them to other devices, and send the received information data to the processor unit for processing; The alarm unit is used to receive the control instructions of the processor unit, and when the determined personnel position is within the determined dangerous area, a dangerous prompt is sent; The first distance detection unit is a UWB base station, which is used to receive the distance information of the maintenance equipment and other devices, and send the distance information to the processor unit; The second distance detection unit is a UWB tag, which is used to send the position information of the personnel to the first detection unit; The alarm system performs the method as claimed in any one of claims 1-8.

10. The alarm system of claim 9, wherein The UWB base station includes a first UWB base station and a second UWB base station; The processor unit is also used to select the strongest waveform path from the waveform information of the signal transmission waves of the first UWB base station and the second UWB base station, respectively, to determine the personnel position.

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