Subway construction positioning system and method

Abstract

The present invention discloses a subway construction positioning system and method, which belongs to the field of subway construction technology, including: determining the construction area based on construction vibration; determining the first position of the construction personnel in the construction area based on the signal arrival time difference; determining the second position of the construction personnel in the construction area based on the signal strength; judging the positioning state based on the first position and the second position of the construction personnel; and determining the current real-time position of the construction personnel based on the positioning state. The present invention determines the first position of the construction personnel in the construction area by the signal arrival time difference; determines the second position of the construction personnel in the construction area by the signal strength; and judges the positioning state by the first position and the second position of the construction personnel; solves the technical problem of the difficulty of accurate positioning in the process of subway construction, realizes the technical effect of improving the positioning accuracy, accurately locating the position of the construction personnel, and thus reducing the possibility of accidents.

Description

Technical Field

[0001] The present invention relates to the technical field of subway construction, and in particular to a subway construction positioning system and method. Background Art

[0002] The subway is a type of urban rail transit line system, which refers to the fast, large-capacity, electric-powered rail transit built in the city.

[0003] Metro construction positioning is crucial to ensuring construction safety and improving construction efficiency. In existing technologies, positioning and timing in indoor spaces have long been a global technical problem. Especially in complex underground environments, such as during subway construction, it is more difficult to achieve accurate positioning. Improving the accuracy of construction positioning can greatly improve the safety and efficiency of subway construction. Summary of the invention

[0004] In order to solve the above problems, the first aspect of the present invention provides a subway construction positioning system, comprising:

[0005] A central controller, which is used to issue instructions and control signals;

[0006] A signal transceiver module, which is connected to the central controller and is used to receive and send data;

[0007] A first positioning line, the first positioning line is connected to the signal transceiver module and is used to determine the construction area;

[0008] A second positioning line, the second positioning line is connected to the first positioning line and is used to determine the current real-time position of the construction personnel;

[0009] A terminal processor, the terminal processor is connected to the first positioning line and is used for processing data;

[0010] The first positioning line includes an optical cable laid along the tunnel construction direction;

[0011] The second positioning line includes a leaky coaxial cable laid along the tunnel construction direction.

[0012] In some embodiments, the first positioning line also includes a number of splitters and fiber amplifiers that interconnect the optical cables;

[0013] The second positioning line also includes: a cluster base station, and a signal repeater connected to the cluster base station;

[0014] The signal repeater comprises: a secondary positioning module, the secondary positioning module is used to determine the first position of the construction personnel in the construction area according to the signal arrival time difference;

[0015] A signal monitoring module, wherein the signal monitoring module is used to obtain signal strength;

[0016] A data processing module, the data processing module is used to process the signal data and determine the second position of the construction personnel in the construction area according to the signal strength;

[0017] Both ends of the leaky coaxial cable are connected to the signal repeater respectively, and the signal repeater is communicatively connected to the splitter;

[0018] The optical cable and leaky coaxial cable are both multi-section structures;

[0019] The leaky coaxial cable is also communicatively connected to the optical fiber amplifier.

[0020] A second aspect of the present invention provides a subway construction positioning method, based on a subway construction positioning system according to any one of the above solutions, comprising:

[0021] Determine construction areas based on construction vibrations;

[0022] Determine a first position of the construction worker in the construction area based on the signal arrival time difference;

[0023] determining a second location of the construction worker in the construction area based on the signal strength;

[0024] Determine the positioning state based on the first position and the second position of the construction personnel;

[0025] Based on the positioning status, determine the current real-time location of the construction personnel.

[0026] In some embodiments, determining the construction area includes:

[0027] Determine the location of disturbances along the fiber;

[0028] The calculation method for determining the disturbance position along the optical fiber is:

[0029] Formula 1;

[0030] In formula 1, is the distance between the fiber disturbance position and the monitoring position, is the speed of light, is the round trip time required for the optical signal, is the refractive index of the optical fiber.

[0031] In some embodiments, determining the first position of the construction worker in the construction area based on the signal arrival time difference includes:

[0032] Determine the coordinates of the first base station and the second base station, and the time difference between the arrival of the signal at the first base station and the arrival of the signal at the second base station;

[0033] The calculation method for determining the first position of the construction personnel in the construction area is:

[0034] Formula 2

[0035] Formula 3

[0036] In formula 2, is the coordinate of the signal source on the X-axis, is the coordinate of the signal source on the Y axis, is the coordinate of the first base station on the X-axis, is the coordinate of the first base station on the Y axis; is the coordinate of the second base station on the X-axis; is the coordinate of the second base station on the Y axis; is the distance difference from the signal source to the first base station and the second base station;

[0037] In formula 3, is the distance difference from the signal source to the first base station and the second base station, is the speed of light, is the time difference between the arrival of the signal at the first base station and the arrival of the signal at the second base station.

[0038] In some embodiments, determining the second position of the construction worker in the construction area based on the signal strength includes:

[0039] Obtaining a first signal strength of at least one distance value within a distance segment in a target scene,

[0040] Wherein, the first signal strength is obtained based on the signal strength of the measured signal source after attenuation of a known distance;

[0041] Determining a signal strength sequence of a target scene within the distance segment based on a first signal strength of at least one distance value within the distance segment;

[0042] Obtain multiple path loss models;

[0043] For each of the plurality of path loss models, determining a fit between the signal strength sequence and the path loss model;

[0044] Determining a target path loss model from a plurality of path loss models based on a fit between the signal strength sequence and the path loss model;

[0045] Based on the target path loss model and the second signal strength, determine the distance between the signal source and the base station,

[0046] Wherein, the second signal strength is obtained based on the signal strength after the attenuation of the measuring signal source;

[0047] Based on the distances between the signal source and the multiple base stations, a second position of the construction worker in the construction area is determined.

[0048] In some embodiments, the path loss model is a model that reflects the variation of the first signal strength with distance;

[0049] The path loss model is calculated by:

[0050] Formula 4

[0051] In formula 4, is the received power; is the transmitting power; is the path loss index; for distance; is a random variable, representing the signal fluctuation caused by multipath effects and other factors.

[0052] In some embodiments, determining the positioning state based on the first position and the second position of the construction personnel includes:

[0053] Construct a reference coordinate system;

[0054] Determining coordinates of a first position and a second position in a reference coordinate system;

[0055] Determine the coordinates of a third position in the reference coordinate system based on the coordinates of the first position and the second position, wherein the third position is the midpoint of a line connecting the first position and the second position;

[0056] determining a dynamic threshold set based on the coordinates of the third position in the reference coordinate system;

[0057] The positioning state is determined based on the distance difference between the first position and the second position and the dynamic threshold set.

[0058] In some embodiments, the positioning status is confirmed by comparing a distance difference between the first position and the second position with a dynamic threshold;

[0059] The determination of the positioning status includes: generating a dynamic threshold set according to the distance between the third position and the center of the construction area, and comparing the distance difference between the first position and the second position with the dynamic threshold, and when the distance difference between the first position and the second position is less than or equal to the dynamic threshold, determining that the positioning is successful; when the distance difference between the first position and the second position is greater than the dynamic threshold, determining that the positioning has failed.

[0060] In some embodiments, determining the current real-time position of the construction personnel includes: after determining that the positioning is successful, determining the third position as the current position of the construction personnel.

[0061] By adopting the above technical solution, the present invention mainly has the following technical effects:

[0062] The first position of the construction workers in the construction area is determined by the signal arrival time difference; the second position of the construction workers in the construction area is determined by the signal strength; and the positioning status is judged by the first and second positions of the construction workers. This solves the technical problem of the difficulty in accurate positioning during subway construction, and achieves the technical effect of improving positioning accuracy, accurately locating the position of construction workers, and thus reducing the possibility of accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 This is a structural schematic diagram of a subway construction positioning system of the present invention;

[0064] Figure 2 This is a structural block diagram of a subway construction positioning system of the present invention;

[0065] Figure 3 It is a schematic diagram of the communication system structure of a subway construction positioning system when the local leakage cable is disconnected;

[0066] Figure 4 It is a schematic diagram of the communication system structure of a subway construction positioning system when a local optical cable is disconnected;

[0067] Figure 5 A schematic diagram of the communication system structure of a subway construction positioning system when the optical cable communicates alone;

[0068] Figure 6 It is a schematic diagram of the communication system structure when the leaky cable of a subway construction positioning system communicates alone;

[0069] Figure 7 The figure is a flow chart of a subway construction positioning method.

[0070] The meanings of the reference numerals are as follows:

[0071] 1. Central controller;

[0072] 2. Signal transceiver module;

[0073] 3. First positioning line; 31. Optical cable; 32. Splitter; 33. Optical fiber amplifier;

[0074] 4. Second positioning line; 41. Leaky coaxial cable; 42. Cluster base station; 43. Signal repeater; 431. Secondary positioning module; 432. Signal monitoring module; 433. Data processing module;

[0075] 5. End processor;

[0076] 6. Optical pulse transmitter;

[0077] 7. External network access module. DETAILED DESCRIPTION

[0078] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the specification of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0079] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0080] Embodiment 1: Figure 1 and Figure 2 As shown, the first aspect of the present invention provides a subway construction positioning system, including: a central controller 1, which is used to issue instructions and control signals; a signal transceiver module 2, which is connected to the central controller 1 and is used to receive and send data; a first positioning line 3, which is connected to the signal transceiver module 2 and is used to determine the construction area; the second positioning line 4 is connected to the first positioning line 3 and is used to determine the current real-time position of the construction personnel; and a terminal processor 5, which is connected to the first positioning line 3 and is used to process data.

[0081] In some embodiments, the first positioning line 3 includes an optical cable 31 laid along the tunnel construction direction. In some embodiments, the first positioning line 3 can determine the construction area by detecting the scattering characteristics of light in the optical cable 31. Specifically, the first positioning line 3 can determine the disturbance position along the optical fiber by measuring the propagation time of the optical signal in the optical fiber and the intensity of the backscattered light. More content about determining the disturbance position along the optical fiber will be further described below.

[0082] Furthermore, the optical cable 31 is a multi-section structure, and the first positioning line 3 further includes a plurality of splitters 32 and optical fiber amplifiers 33 that interconnect the optical cables 31, and the two ends of the multi-section optical cable 31 are respectively connected to the splitter 32 and the optical fiber amplifier 33. In some embodiments, the splitter 32 can split the optical signal into multiple paths, so as to be connected to multiple devices; in some embodiments, the optical fiber amplifier 33 is connected to the optical cable 31, and the optical fiber amplifier 33 is a device for extending and enhancing the transmission distance of the optical fiber signal.

[0083] Furthermore, the second positioning line 4 includes a leakage coaxial cable 41 laid along the direction of tunnel construction. In some embodiments, the leakage coaxial cable 41 has the dual functions of signal transmission and antenna. The outer conductor of this cable is provided with periodic slots, which allow electromagnetic wave energy to partially penetrate from the inside of the cable to the outside, and also allow external electromagnetic field energy to be sensed into the cable. This design enables the leakage coaxial cable 41 to radiate electromagnetic waves to the surrounding environment while transmitting signals, and is suitable for areas where radio wave transmission is restricted.

[0084] In some embodiments, the second positioning line 4 also includes: a cluster base station 42, and a signal repeater 43 connected to the cluster base station 42; wherein the signal repeater 43 is connected to the cluster base station 42 to realize data switching communication of multiple network coverages of the cluster base station 42, and the signal repeater 43 is also communicatively connected to the leakage coaxial cable 41.

[0085] In some embodiments, the cluster base station 42 transmits wireless signals through antennas to cover its service area and receives signals sent by mobile terminal devices. In some embodiments, the cluster base station 42 also includes a signal processing unit, which is used to demodulate and decode the received signal after it is processed by the radio frequency unit and the baseband processing unit; a data transmission unit, which is used to send the processed data to the control center or other base stations through the transmission interface to realize data and voice transmission; a resource scheduling unit, which is used to allocate and manage communication channels according to preset scheduling strategies to ensure the effectiveness and stability of communication; a mobile switching unit; the mobile switching unit is used to coordinate the base station to complete the communication switching when the mobile terminal device moves to the coverage area of ​​another base station to ensure uninterrupted communication.

[0086] Furthermore, the signal repeater 43 includes: a secondary positioning module 431, the secondary positioning module 431 is used to determine the first position of the construction personnel in the construction area according to the signal arrival time difference; a signal monitoring module 432, the signal monitoring module 432 is used to obtain the signal strength; a data processing module 433, the data processing module 433 is used to process the signal data and determine the second position of the construction personnel in the construction area according to the signal strength. More content about determining the first position of the construction personnel in the construction area according to the signal arrival time difference and determining the second position of the construction personnel in the construction area according to the signal strength will be further described below.

[0087] like Figure 3-Figure 6 As shown, in some embodiments, the leakage coaxial cable 41 is also a multi-section structure, and both ends of the leakage coaxial cable 41 of the multi-section structure are respectively communicatively connected to the signal repeater 43, and the signal repeater 43 is communicatively connected to the splitter 32. Furthermore, the leakage coaxial cable 41 is also communicatively connected to the optical fiber amplifier 33. By connecting the optical cable 31 to the leakage coaxial cable 41, effective coverage of wireless signals in the tunnel is ensured, thereby realizing the call and data backhaul process.

[0088] By designing the optical cable 31 and the leaky coaxial cable 41 as a multi-section structure, the communication process can be completed even when a section of the optical cable 31 and / or the leaky coaxial cable 41 is in a disconnected state, thereby adapting to the complex communication environment of the construction site.

[0089] In some embodiments, the terminal processor 5 is used to determine the real-time position of the construction workers based on the first position of the construction workers in the construction area and the second position of the construction workers in the construction area. More details about determining the real-time position will be further explained below. By setting the terminal processor 5 inside the construction tunnel, on the one hand, by processing near the data source, the time required for data transmission can be reduced, thereby reducing the overall delay. On the other hand, the edge device can process data instantly where the data is generated, avoiding the need to transmit a large amount of data back to the central server, thereby improving processing efficiency.

[0090] In some embodiments, the subway construction positioning system also includes: an optical pulse transmitting end 6, which is used to transmit optical pulses for measurement or data transmission; specifically, the optical pulse transmitting end 6 transmits optical pulses into the optical cable 31. When the optical pulses propagate in the optical cable 31, the optical cable 31 will produce scattering phenomena such as Rayleigh scattering, Brillouin scattering and Raman scattering due to environmental changes (such as vibration, temperature, strain, etc.).

[0091] In some embodiments, the subway construction positioning system also includes: an external network access module 7, the external network access module is connected to the central controller 1, the external network access module 7 is connected to an external cellular network mobile network or the Internet communication, the subway construction positioning system is connected to the external network based on the external network access module 7, and the information data of the mutual communication needs to be reviewed by the central controller 1 to avoid internal information leakage.

[0092] Embodiment 2: Figure 7 As shown, the second aspect of the present invention provides a subway construction positioning method, comprising the following steps:

[0093] S1. Determine the construction area based on construction vibration;

[0094] In this step, the construction area can be determined by detecting the scattering characteristics of light in the optical fiber; in some embodiments, the disturbance position along the optical fiber can be determined by measuring the propagation time of the optical signal in the optical fiber and the intensity of the backscattered light. In some embodiments, by determining the disturbance position along the optical fiber, the location of the construction area in the tunnel can be determined.

[0095] In some embodiments, determining the construction area includes:

[0096] Determine the location of disturbances along the fiber;

[0097] The calculation method for determining the disturbance position along the optical fiber is:

[0098] Formula 1;

[0099] In formula 1, is the distance between the fiber disturbance position and the monitoring position, is the speed of light, is the round trip time required for the optical signal, is the refractive index of the optical fiber;

[0100] In some embodiments, the operator may construct a coordinate system based on the tunnel construction progress, determine the construction coordinates by determining the distance between the fiber disturbance position and the monitoring position, and thus determine the construction site.

[0101] S2. determining a first position of the construction personnel in the construction area based on the signal arrival time difference;

[0102] In this step, after determining the construction area in the tunnel, the signals from the same signal source can be received through multiple base stations in the construction area. By obtaining the time difference of the measured signal reaching each base station (receiver), the position of the signal source relative to the base station can be calculated, thereby determining the first position of the construction personnel in the construction area.

[0103] In some embodiments, data can be transmitted by sending and receiving extremely narrow pulses with nanosecond or even sub-nanosecond duration. These pulse signals are very short in the time domain, and the corresponding frequency domain bandwidth is very wide, typically reaching the GHz level.

[0104] In some embodiments, determining the first position of the construction worker in the construction area based on the signal arrival time difference includes:

[0105] Determine the coordinates of the first base station and the second base station, and the time difference between the arrival of the signal at the first base station and the arrival of the signal at the second base station;

[0106] In some embodiments, the coordinates of the first base station and the second base station may be acquired when the first base station and the second base station are set.

[0107] The calculation method for determining the first position of the construction personnel in the construction area is:

[0108] Formula 2

[0109] Formula 3

[0110] In formula 2, is the coordinate of the signal source on the X-axis, is the coordinate of the signal source on the Y axis, is the coordinate of the first base station on the X-axis, is the coordinate of the first base station on the Y axis; is the coordinate of the second base station on the X-axis; is the coordinate of the second base station on the X-axis; is the distance difference from the signal source to the first base station and the second base station;

[0111] In formula 3, is the distance difference from the signal source to the first base station and the second base station, is the speed of light, is the time difference between the arrival of the signal at the first base station and the second base station;

[0112] In some embodiments, the first position of the construction worker in the construction area may be determined by calculating the coordinates of the signal source.

[0113] S3. Determine a second position of the construction worker in the construction area based on the signal strength;

[0114] In this step, after determining the construction area in the tunnel, the distance between the construction personnel and the base station can be determined based on the rule that the signal strength changes with the distance. At the same time, the signal strength is measured through multiple base stations (such as Wi-Fi access points for example), thereby calculating the distance between the signal source and the multiple base stations. Finally, the second position of the construction personnel in the construction area is determined based on triangulation.

[0115] In some embodiments, determining the second position of the construction worker in the construction area based on the signal strength includes:

[0116] S301, obtaining a first signal strength of at least one distance value in a distance segment in a target scene;

[0117] In some embodiments, the first signal strength is obtained based on measuring the signal strength of a signal source after attenuation of a known distance. Exemplarily, the first signal strength can be measured by placing a signal strength meter at a fixed distance after the base station is installed.

[0118] S302, determining a signal strength sequence of a target scene within the distance segment based on a first signal strength of at least one distance value within the distance segment;

[0119] In some embodiments, the signal strength sequence is a sequence obtained by arranging the first signal strength of at least one distance value in order of distance.

[0120] S303, obtaining multiple path loss models;

[0121] The path loss model may be a model that reflects the change of the first signal strength with distance. For example, the path loss model may include a linear prediction model, a nonlinear prediction model (such as a power law prediction model, an exponential prediction model, a logarithmic prediction model), etc. In some embodiments, the path loss model may be obtained through a network, or by calling from a storage device, a database, etc.

[0122] In some embodiments, the path loss model is calculated by:

[0123] Formula 4

[0124] In formula 4, is the received power; is the transmitting power; is the path loss index; for distance; is a random variable, representing the signal fluctuation caused by multipath effects and other factors.

[0125] S304, for each of the multiple path loss models, determining a fit between the signal strength sequence and the path loss model;

[0126] In some embodiments, the degree of fit may represent the degree of fit between the sequence of signal strength and the path loss model. For example, the higher the degree of fit between the regression curve of the path loss and the signal strength sequence, the higher the degree of fit may be.

[0127] S305, determining a target path loss model from a plurality of path loss models based on a fit between the signal strength sequence and the path loss model;

[0128] In some embodiments, a loss model with the highest fit may be selected from a plurality of path loss models as a target path loss model.

[0129] S306, determining the distance between the signal source and the base station based on the target path loss model and the second signal strength;

[0130] In some embodiments, the second signal strength is obtained based on measuring the signal strength after the signal source is attenuated. In some embodiments, a signal can be sent by a signal source carried by a construction worker, and the second signal strength of the signal sent by the signal source can be determined by the base station. Finally, the target path loss model and the obtained second signal strength can be used to determine the distance between the signal source and the base station.

[0131] S307, determining a second position of the construction personnel in the construction area based on the distance between the signal source and the multiple base stations;

[0132] In some embodiments, a triangulation method may be used to determine the location of the signal source, thereby determining a second location of the construction worker in the construction area.

[0133] S4, determining the positioning state based on the first position and the second position of the construction personnel;

[0134] In this step, whether the current positioning state is accurate is determined by the first position of the construction personnel in the construction area and the second position of the construction personnel in the construction area.

[0135] In some embodiments, determining the positioning state based on the first position and the second position of the construction personnel includes:

[0136] S401, constructing a reference coordinate system;

[0137] In some embodiments, the center of the construction area may be used as the coordinate origin to construct a reference coordinate system.

[0138] S402, determining the coordinates of the first position and the second position in the reference coordinate system;

[0139] In some embodiments, the coordinates of the first position and the second position may be determined in the reference coordinate system by using a coordinate transformation method.

[0140] S403, determining the coordinates of a third position in the reference coordinate system based on the coordinates of the first position and the second position, wherein the third position is the midpoint of a line connecting the first position and the second position;

[0141] S404, determining a dynamic threshold set based on the coordinates of the third position in the reference coordinate system;

[0142] In some embodiments, the dynamic threshold set refers to a threshold set used to determine whether positioning is accurate.

[0143] In some embodiments, the dynamic threshold set can be set based on the distance between the third position and the center of the construction area. In some embodiments, by taking the center of the construction area as the coordinate origin, after determining the coordinates of the third position, the distance between the third position and the center of the construction area can be obtained. Exemplarily, the greater the distance between the third position and the center of the construction area, the smaller the dynamic threshold. The reason is that the greater the distance between the construction personnel and the center of the construction area, the greater the possibility of mistakenly entering the dangerous area. Therefore, when the construction personnel are far away from the center of the construction area, it is necessary to improve the positioning accuracy, accurately locate the position of the construction personnel, and issue a warning message when the construction personnel mistakenly enter the dangerous area, thereby reducing the possibility of accidents.

[0144] S405, determining a positioning state based on a distance difference between the first position and the second position and a dynamic threshold set;

[0145] In some embodiments, the positioning state can be confirmed by comparing the distance difference between the first position and the second position with a dynamic threshold. For example, the determination of the positioning state includes: generating a dynamic threshold set according to the distance between the third position and the center of the construction area, and comparing the distance difference between the first position and the second position with the dynamic threshold, when the distance difference between the first position and the second position is less than or equal to the dynamic threshold, determining that the positioning is successful; when the distance difference between the first position and the second position is greater than the dynamic threshold, determining that the positioning fails.

[0146] In some embodiments, a dynamic threshold set is generated by the distance between the construction workers and the center of the construction area. The corresponding threshold can be applied to the distance between the construction workers and the construction area. The farther the construction workers are from the construction center, the higher the positioning accuracy requirements are. This greatly reduces the positioning error caused by the mismatch between the threshold and the scene, and issues an early warning message when the construction workers are in a dangerous area, thereby reducing the possibility of mistakenly entering a dangerous area without being alerted due to positioning errors, thereby improving the timeliness and accuracy of construction positioning.

[0147] S5. Determine the current real-time location of the construction personnel based on the positioning status;

[0148] In some embodiments, determining the current real-time position of the construction personnel includes: after determining that the positioning is successful, determining the third position as the current position of the construction personnel, otherwise determining that the positioning has failed.

[0149] Finally, it should be noted that the embodiments disclosed in the present invention are only preferred embodiments of the present invention, which are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A subway construction positioning system, characterized in that: include: A central controller, which is used to issue instructions and control signals; A signal transceiver module, which is connected to the central controller and is used to receive and send data; A first positioning line, the first positioning line is connected to the signal transceiver module and is used to determine the construction area; A second positioning line, the second positioning line is connected to the first positioning line and is used to determine the current real-time position of the construction personnel; A terminal processor, the terminal processor is connected to the first positioning line and is used for processing data; The first positioning line includes an optical cable laid along the tunnel construction direction; The second positioning line includes a leaky coaxial cable laid along the tunnel construction direction; The first positioning circuit also includes a number of splitters and optical fiber amplifiers that connect the optical cables to each other; The second positioning line also includes: a cluster base station, and a signal repeater connected to the cluster base station; The signal repeater comprises: a secondary positioning module, the secondary positioning module is used to determine the first position of the construction personnel in the construction area according to the signal arrival time difference; A signal monitoring module, wherein the signal monitoring module is used to obtain signal strength; A data processing module, the data processing module is used to process the signal data and determine the second position of the construction personnel in the construction area according to the signal strength; Both ends of the leaky coaxial cable are connected to the signal repeater respectively, and the signal repeater is communicatively connected to the splitter; The optical cable and leaky coaxial cable are both multi-section structures; The leaky coaxial cable is also communicatively connected to the optical fiber amplifier.

2. A subway construction positioning method, characterized in that: The subway construction positioning system according to claim 1 comprises: Determine construction areas based on construction vibrations; Determine a first position of the construction worker in the construction area based on the signal arrival time difference; determining a second location of the construction worker in the construction area based on the signal strength; Determine the positioning state based on the first position and the second position of the construction personnel; Based on the positioning status, determine the current real-time location of the construction personnel.

3. A subway construction positioning method according to claim 2, characterized in that: The determined construction area includes: Determine the location of disturbances along the fiber; The calculation method for determining the disturbance position along the optical fiber is: Formula 1; In formula 1, is the distance between the fiber disturbance position and the monitoring position, is the speed of light, is the round trip time required for the optical signal, is the refractive index of the optical fiber.

4. A subway construction positioning method according to claim 2, characterized in that: Determining the first position of the construction personnel in the construction area based on the signal arrival time difference comprises: Determine the coordinates of the first base station and the second base station, and the time difference between the arrival of the signal at the first base station and the arrival of the signal at the second base station; The calculation method for determining the first position of the construction personnel in the construction area is: Formula 2 Formula 3 In formula 2, is the coordinate of the signal source on the X-axis, is the coordinate of the signal source on the Y axis, is the coordinate of the first base station on the X-axis, is the coordinate of the first base station on the Y axis; is the coordinate of the second base station on the X-axis; is the coordinate of the second base station on the Y axis; is the distance difference from the signal source to the first base station and the second base station; In formula 3, is the distance difference from the signal source to the first base station and the second base station, is the speed of light, is the time difference between the arrival of the signal at the first base station and the arrival of the signal at the second base station.

5. A subway construction positioning method according to claim 2, characterized in that: Determining the second position of the construction personnel in the construction area based on the signal strength includes: Obtaining a first signal strength of at least one distance value within a distance segment in a target scene, Wherein, the first signal strength is obtained based on the signal strength of the measured signal source after attenuation of a known distance; Determining a signal strength sequence of a target scene within the distance segment based on a first signal strength of at least one distance value within the distance segment; Obtain multiple path loss models; For each of the plurality of path loss models, determining a fit between the signal strength sequence and the path loss model; Determining a target path loss model from a plurality of path loss models based on a fit between the signal strength sequence and the path loss model; Based on the target path loss model and the second signal strength, determine the distance between the signal source and the base station, Wherein, the second signal strength is obtained based on the signal strength after the attenuation of the measuring signal source; Based on the distances between the signal source and the multiple base stations, a second position of the construction worker in the construction area is determined.

6. A subway construction positioning method according to claim 5, characterized in that: The path loss model is a model that reflects the change of the first signal strength with distance; The path loss model is calculated by: Formula 4 In formula 4, is the received power; is the transmitting power; is the path loss index; for distance; is a random variable, representing the signal fluctuation caused by multipath effects and other factors.

7. A subway construction positioning method according to claim 2, characterized in that: The determining of the positioning state based on the first position and the second position of the construction personnel includes: Construct a reference coordinate system; Determining coordinates of a first position and a second position in a reference coordinate system; Determine the coordinates of a third position in the reference coordinate system based on the coordinates of the first position and the second position, wherein the third position is the midpoint of a line connecting the first position and the second position; determining a dynamic threshold set based on the coordinates of the third position in the reference coordinate system; The positioning state is determined based on the distance difference between the first position and the second position and the dynamic threshold set.

8. A subway construction positioning method according to claim 7, characterized in that: The positioning state is confirmed by comparing the distance difference between the first position and the second position with a dynamic threshold; The determination of the positioning status includes: generating a dynamic threshold set according to the distance between the third position and the center of the construction area, and comparing the distance difference between the first position and the second position with the dynamic threshold, and when the distance difference between the first position and the second position is less than or equal to the dynamic threshold, determining that the positioning is successful; when the distance difference between the first position and the second position is greater than the dynamic threshold, determining that the positioning has failed.

9. A subway construction positioning method according to claim 8, characterized in that: Determining the current real-time position of the construction personnel includes: after determining that the positioning is successful, determining the third position as the current position of the construction personnel.

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