CN112312407B - GSM-R survey system and method based on terminal - Google Patents

GSM-R survey system and method based on terminal Download PDF

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CN112312407B
CN112312407B CN202011037602.6A CN202011037602A CN112312407B CN 112312407 B CN112312407 B CN 112312407B CN 202011037602 A CN202011037602 A CN 202011037602A CN 112312407 B CN112312407 B CN 112312407B
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antenna
work point
coverage
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tunnel
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姚欣楠
刘立海
王晓婷
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China Railway Siyuan Survey and Design Group Co Ltd
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Abstract

The invention relates to a GSM-R reconnaissance system and a method based on a terminal, wherein the system comprises: the project creation module is used for creating corresponding projects and work points according to specific projects and storing all data in the projects; the wireless coverage prediction module comprises an antenna coverage prediction submodule and a leaky cable coverage prediction submodule and is used for carrying out wireless link budget according to the actual situation of a field; the reconnaissance information recording module is used for recording relevant information of each work point, such as route mileage, distance from a route center, longitude and latitude, elevation difference between the original ground of the field and a rail surface and the like; and the survey report generating module is used for automatically generating an electronic version survey report. The GSM-R survey system based on the terminal enables designers to determine whether the selected position meets the wireless coverage requirement through wireless coverage prediction on a survey site, and meanwhile, a survey report can be generated immediately after relevant information of the site position is recorded on the site, so that the workload of secondary arrangement of the designers is reduced.

Description

GSM-R survey system and method based on terminal
Technical Field
The invention belongs to the technical field of railway digital mobile communication systems, and particularly relates to a GSM-R survey system and method based on a terminal.
Background
The exploration of the GSM-R base station and the digital relay equipment is an important work in the engineering construction process of the railway digital mobile communication system.
Before a designer carries out site survey, a primary wireless station site mileage and weak field area solution is provided. In order to stabilize the design scheme and promote the land acquisition work of the wireless station yard, a designer needs to carry out investigation on the site according to the primary design scheme.
One of the main work of site survey is to judge whether the wireless coverage requirement is met according to the actual terrain condition of the site; and the other is to measure and record the route mileage corresponding to the planned terrace position, the distance from the route center, the longitude and latitude, the surrounding landform, the nearby civil house, the electric power facility and other information. After the designer completes the site survey work, a corresponding site survey report needs to be provided.
At present, on one hand, designers cannot carry out wireless link budget on site, can only determine an approximate wireless coverage effect by design experience, and possibly cause the conservative design scheme, and the repeated adjustment of the position of the terrace is caused during the optimization of the later design scheme. On the other hand, designers mainly adopt paper to record the field data and information, and can not automatically generate a survey report by rearranging the field recorded information and filling the information into the survey report after returning to the premises. The repeated content of field work and interior work means that designers have repeated work.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a GSM-R survey system and a GSM-R survey method based on a terminal, which can quickly and accurately complete survey, realize GSM-R wireless coverage prediction and automatic generation of a GSM-R survey report, reduce the workload of workers and improve the working efficiency.
The technical scheme of the invention is realized as follows: the invention discloses a GSM-R survey system based on a terminal, which comprises a project creating module, a wireless coverage predicting module, a survey information recording module and a survey report generating module,
the project creating module is used for creating project information and a work point table corresponding to a specific project, and the project information and the work point table comprise project names and work point numbers;
the wireless coverage prediction module is used for performing wireless link budget on each work point according to actual landform on site, predicting wireless coverage conditions, determining related data and storing the related data in a memory of the corresponding work point;
the reconnaissance information recording module is used for recording data to be measured of each work point and storing the data in a memory of the corresponding work point;
the survey report generating module is used for inputting an electronic survey report template required by a corresponding project, reading relevant information stored by each work point, and filling the relevant information in the input electronic survey report template, so as to generate a required survey report.
The data to be measured corresponding to each work point recorded by the reconnaissance information recording module comprises line mileage corresponding to the position of the field, distance from the center of the line, longitude and latitude, height difference between the original ground and the rail surface of the field, surrounding landforms, and information of nearby civil houses and electric power facilities.
Further, the wireless coverage prediction module comprises an antenna coverage prediction submodule or/and a leaky cable coverage prediction submodule, wherein the antenna coverage prediction submodule is used for link budget covered by an antenna outside a tunnel, and the leaky cable coverage prediction submodule is used for link budget covered by a leaky cable in the tunnel.
Further, the antenna coverage prediction submodule adopts an Okumura-Hata model, and calculates a level value at the antenna of the receiver according to the input field actual environment condition, the equipment type, the equipment output power, the height of the transmitting antenna, the gain of the transmitting antenna, the height of the antenna of the receiver and the propagation distance, and if the level value at the antenna of the receiver meets the coverage requirement, corresponding related parameter information is stored in a memory of a corresponding work point.
Further, the leaky cable coverage prediction submodule adopts an engineering link model, and needs to input the device type, the device output power, the length of the radio frequency cable outside the tunnel and the length of the leaky cable inside the tunnel, so as to calculate the level value at the antenna of the receiver, and if the level value at the antenna of the receiver meets the coverage requirement, corresponding related parameter information is stored in a memory of a corresponding working point.
Furthermore, the reconnaissance information recording module is also used for calling a camera to take pictures and videos at each work station according to a preset rule and storing the pictures and videos in a memory of the corresponding work station.
The invention discloses a GSM-R survey method based on a terminal, which comprises the following steps:
creating project information and work point tables corresponding to specific projects, wherein the project information and the work point tables comprise project names and work point numbers;
performing wireless link budget on each work point according to actual landforms of the site, predicting wireless coverage conditions, determining output power, transmitting antenna height and transmitting antenna gain of equipment, and storing related data in a memory of the corresponding work point;
recording the route mileage corresponding to the terrace position of each work point, the distance from the center of the route, the longitude and latitude, the height difference between the original ground and the rail surface of the terrace, the landform and landform of the periphery, and the information of nearby civil houses and electric power facilities, and storing the information in the memory of the corresponding work point;
and inputting an electronic survey report template required by a corresponding project, reading the relevant information stored in each work point, and filling the relevant information into the input electronic survey report template, thereby generating a required survey report.
Further, performing wireless link budget for each work point according to the actual topography and landform of the site, comprising: and performing link budget on the antenna coverage outside the tunnel according to the actual topographic features of the site or performing link budget on the leaky cable coverage inside the tunnel according to the actual topographic features of the site.
Further, link budget is carried out on the antenna coverage outside the tunnel according to the actual landform and the landform of the site, and the link budget method comprises the following steps:
and calculating a level value at the antenna of the receiver by adopting an Okumura-Hata model according to the input field actual environment condition, the equipment type, the equipment output power, the height of a transmitting antenna, the gain of the transmitting antenna, the height of the antenna of the receiver and the propagation distance, adjusting the output power of the equipment, the height of the transmitting antenna and the gain parameter of the transmitting antenna if the calculated level value at the antenna of the receiver does not meet the coverage requirement, then recalculating the level value at the antenna of the receiver until the level value at the antenna of the receiver meeting the coverage requirement is calculated, and storing corresponding related parameter information in a memory of a corresponding work point.
Further, link budget is carried out on leaky cable coverage in the tunnel according to actual landforms of the site, and the link budget method comprises the following steps:
an engineering link model is adopted, and the type of equipment, the output power of the equipment, the length of a radio frequency cable outside a tunnel and the length of a leaky cable inside the tunnel are input, so that a level value at the antenna position of a receiver is calculated, wherein after the length of the radio frequency cable outside the tunnel is input, a system can automatically judge the model of the required radio frequency cable, and calculate the loss of the radio frequency cable outside the tunnel; meanwhile, after the length of the leaky cable in the tunnel is input, the system can automatically calculate the loss of the leaky cable, if the calculated level value at the antenna of the receiver does not meet the coverage requirement, the parameters of the output power of the equipment, the length of the radio frequency cable outside the tunnel and the length of the leaky cable in the tunnel are adjusted, then the level value at the antenna of the receiver is recalculated until the level value at the antenna of the receiver meeting the coverage requirement is calculated, and corresponding related parameter information is stored in a memory of a corresponding work point.
And further, calling a camera to take pictures and videos at each work point according to a preset rule, and storing the pictures and videos in a memory of the corresponding work point.
The invention has at least the following beneficial effects:
the GSM-R survey system based on the terminal comprises a project creating module, a wireless coverage predicting module, a survey information recording module and a survey report generating module, wherein the project creating module is used for creating corresponding projects and work points according to specific projects and storing all data in the projects; the wireless coverage prediction module comprises an antenna coverage prediction submodule and a leaky cable coverage prediction submodule and is used for carrying out wireless link budget according to the actual situation of a field; the reconnaissance information recording module is used for recording relevant information of each work point (a GSM-R base station or a digital relay equipment platform), such as line mileage, distance from a line center, longitude and latitude, height difference between the original ground of the platform and a rail surface and the like; and the survey report generating module is used for automatically generating an electronic version survey report. The GSM-R survey system based on the terminal enables designers to determine whether the selected position meets the wireless coverage requirement through wireless coverage prediction on a survey site, can quickly and accurately complete the survey, can immediately generate a survey report after recording relevant information of the site position on the site, and reduces the workload of secondary arrangement of the designers.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a functional block diagram of a GSM-R survey system based on a terminal according to an embodiment of the present invention;
fig. 2 is a flowchart of the operation of the GSM-R survey system based on the terminal according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment is a GSM-R survey system based on a terminal, the system is deployed on a portable terminal through a client or an APP, functional modules of the system are shown in fig. 1, and an operation flow is shown in fig. 2.
Referring to fig. 1, the embodiment discloses a GSM-R survey system based on a terminal, which includes a project creation module 1, a wireless coverage prediction module 2, a survey information recording module 3, and a survey report generation module 4,
the project creating module is used for creating project information and a work point table corresponding to a specific project, and the project information and the work point table comprise project names and work point numbers; the designer uses the project creation module to input the project name and the corresponding work point number, and create project information and a related work point table for storing related data. And creating a work point for each planned GSM-R base station or digital relay equipment terrace position. Each work site includes the relevant variables needed to generate a survey report and applies for storage space for each variable.
The wireless coverage prediction module is used for performing wireless link budget on each work point (GSM-R base station or digital relay equipment field) according to actual landforms of the field, predicting the wireless coverage condition, determining relevant parameters such as output power, transmitting antenna height and transmitting antenna gain of equipment and storing the finally determined relevant parameters in a corresponding work point memory. And the designer can choose to predict the coverage of the antenna outside the tunnel or the coverage of the leaky cable inside the tunnel according to the actual situation on site.
The reconnaissance information recording module 3 is used for recording the route mileage corresponding to the position of the field of each work point, the distance from the center of the route, the longitude and latitude, the height difference between the original ground and the rail surface of the field, the landform of the surrounding terrain, nearby civil houses, electric power facilities and other information, calling a camera to shoot photos and videos at each work point according to a preset rule, and storing the information in the memory of the corresponding work point. The designer uses the module to input the relevant information of the corresponding work point, and simultaneously shoots the pictures of the corresponding positions of the large-mileage direction of the line, the small-mileage direction of the line, the field and the 360-degree omnibearing video of the field according to the preset rule.
The survey report generating module 4 is used for inputting an electronic survey report template required by the project, reading the relevant information stored in each work point, and filling the relevant information in the input electronic survey report template, so as to generate a survey report. According to the characteristics of the project, designers need to input an electronic survey report template required by the project.
Further, the wireless coverage prediction module comprises an antenna coverage prediction submodule or/and a leaky cable coverage prediction submodule, wherein the antenna coverage prediction submodule is used for the link budget covered by the antenna outside the tunnel, and the leaky cable coverage prediction submodule is used for the link budget covered by the leaky cable inside the tunnel.
Furthermore, the antenna coverage prediction submodule adopts an Okumura-Hata model, and calculates the level value of the receiver antenna according to the input field actual environment condition, the equipment type, the equipment output power, the height of the transmitting antenna, the gain of the transmitting antenna, the height of the receiver antenna and the propagation distance.
The antenna coverage prediction sub-module 21 adopts an Okumura-Hata model, and the formula is as follows:
RXLEV＝TXLEV-PassiveLoss-FeederLoss-{69.55+26.16log(f)-13.82log(hb)－[(1.1log(f)-0.7)hm-(1.56log(f)-0.8)]+[44.9-6.55log(hb)]log(d)-Sa}+AntennaGain-ShadowFading
wherein:
RXLEV is the level at the receiver antenna (in dBm);
TXLEV is the device output power (in dBm);
PasiveLoss is the loss of the passive device (unit dB, 5.5dB in the engineering);
the FeederLoss is the feeder and connector loss (unit dB, 3dB in engineering);
f is the working frequency (unit MHz, 930MHz in engineering);
hb is the transmit antenna height (in m);
hm is the receiver antenna height (in m);
d is the propagation distance (in km);
sa is the building density correction factor (in dB);
AntennaGain is the transmit antenna gain (in dBi);
ShadowFading is shadow fading (in dB, 12dB in engineering).
The designer needs to input the actual environment condition of the site, the device type, the device output power, the height of the transmitting antenna, the gain of the transmitting antenna, the height of the receiver antenna and the propagation distance, so as to calculate the level value of the receiver antenna, and if the calculated level value meets the coverage requirement, the input parameters are stored at the corresponding working point, which comprises the following steps: actual environmental conditions in the field, device type, device output power, transmit antenna height, transmit antenna gain, receiver antenna height, etc.
The actual environment conditions of the site can be divided into urban areas, suburban areas, hills and open areas, and the system sets a building density correction factor (Sa) under each environment condition by combining engineering experience, namely 0.6dB in urban areas, 10.63dB in suburban areas and hills and 19.92dB in open areas.
If the calculated level value does not meet the coverage requirement (considering the requirement of the GSM-R system for the carrier-to-interference ratio C/I, the level at the receiver antenna generally needs to be greater than-80 dBm), the input parameters need to be adjusted. Designers can adjust parameters such as the output power of the device (namely, the output power of the device is increased within the maximum transmission power range), the height of the transmitting antenna (namely, the height of the iron tower is increased or the iron tower is arranged at a place with higher terrain), the gain of the transmitting antenna (namely, the antenna with higher gain is selected), and the like, and then the level value of the antenna of the receiver is recalculated.
Furthermore, the leaky cable coverage prediction submodule adopts an engineering link model and needs to input the type of equipment, the output power of the equipment, the length of the radio frequency cable outside the tunnel and the length of the leaky cable inside the tunnel, so that the level value of the antenna of the receiver is calculated. The leaky cable coverage prediction submodule 22 uses the following formula:
RXLEV＝TXLEV-PassiveLoss-FeederLoss-RFCableLoss-LCXLoss
wherein:
RXLEV is the level at the receiver antenna (in dBm);
TXLEV is the device output power (in dBm);
PasiveLoss is the loss of the passive device (unit dB, 3dB in the project);
the FeederLoss is the feeder joint loss (unit dB, 2dB in the project);
RFCableLoss is the loss (in dB) of the radio frequency cable outside the tunnel;
LCXLoss is the leakage cable loss (in dB, including transmission loss and coupling loss, where coupling loss is a fixed value, and 76dB is taken in the project).
The designer needs to input the device type, the device output power, the length of the radio frequency cable outside the tunnel and the length of the leaky cable in the tunnel, so as to calculate the level value of the antenna of the receiver, and if the calculated level value meets the coverage requirement, the input parameters are stored at the corresponding work point, which comprises the following steps: inputting the device type, the device output power, the length of the radio frequency cable outside the tunnel and the length of the leaky cable inside the tunnel. After the length of the radio-frequency cable outside the tunnel is input, the system can automatically judge the type of the required radio-frequency cable, namely, a 7/8 'radio-frequency cable is adopted when the length is less than 80 meters, a 5/4' radio-frequency cable is adopted when the length is more than or equal to 80 meters, and the loss of the radio-frequency cable outside the tunnel is calculated according to the set hectometer loss value of the radio-frequency cable (the hectometer loss is 3.8dB of the 7/8 'radio-frequency cable and 2.7dB of the 5/4' radio-frequency cable); similarly, after the length of the leaky cable in the tunnel is input, the system can calculate the leaky cable loss according to the set leaky cable hectometer loss value (hectometer loss is 2.4 dB).
If the calculated level value does not meet the coverage requirement, the input parameters need to be adjusted. Designers can adjust parameters such as the output power of the equipment (namely, the output power of the equipment is increased within the range of the maximum transmitting power), the length of a radio frequency cable outside a tunnel (namely, the equipment is placed at a position closer to a tunnel opening), the length of a leaky cable inside the tunnel (namely, the equipment inside the tunnel is increased, and the length of the connected leaky cable is reduced), and then the level value of the antenna of the receiver is recalculated.
Furthermore, the reconnaissance information recording module is also used for calling a camera to take pictures and videos at each work station according to a preset rule and storing the pictures and videos in a memory of the corresponding work station.
Referring to fig. 2, the embodiment discloses a GSM-R survey method based on a terminal, which includes the following steps:
the project information and the work point table corresponding to the specific project are established through a project establishing module, and the project information and the work point table comprise project names and work point numbers;
performing wireless link budget on each work point through a wireless coverage prediction module according to the actual landform of the site, predicting the wireless coverage condition, determining the output power of equipment, the height of a transmitting antenna and the gain of the transmitting antenna, and storing related data in a memory of the corresponding work point;
when a designer carries out on-site investigation, the measured and recorded data including the line mileage corresponding to the position of the field of the GSM-R base station or the digital relay equipment, the distance from the line center, the longitude and latitude, the height difference between the original ground and the rail surface of the field, the landform of the surrounding terrain, the civil houses nearby, the electric power facilities and the like are recorded by the investigation information recording module and are stored in the memory of the corresponding work point; meanwhile, for each point location, the shot photos or video recordings can be stored in the system. The information is stored in variables corresponding to the work points.
And inputting an electronic survey report template required by the corresponding project through a survey report generating module, reading the relevant information stored by each work point, and filling the relevant information in the input electronic survey report template to generate the required survey report.
Further, the wireless coverage prediction module can perform wireless link budget according to the actual situation of the field, so as to predict the coverage of the base station or the digital relay device and assist designers to determine a reasonable wireless scheme. The module supports wireless coverage prediction of two scenes, including antenna coverage prediction and leaky coaxial cable (hereinafter referred to as leaky cable) coverage prediction. The former is used for the link budget of antenna coverage outside the tunnel, and the latter is used for the link budget of leaky cable coverage inside the tunnel. The relevant parameter information finally determined by the module can be stored in the relevant variables of the corresponding work points.
Further, performing link budget on the antenna coverage outside the tunnel according to the actual landform of the site through an antenna coverage prediction submodule, wherein the link budget includes:
when a designer uses the antenna coverage prediction submodule to predict the antenna coverage, the designer firstly inputs the field environment, and the prediction can be divided into urban areas, suburbs, hills, open areas and the like. The division is mainly based on the height and density of buildings, the width of streets, trees, terrains and other factors influencing the propagation of electromagnetic waves. The module can automatically determine the density correction factor of the building according to the filled field environment by combining with the set engineering experience value, namely 0.6dB for the urban area, 10.63dB for the suburb and hilly area and 19.92dB for the open area. Then, the device type, the device output power, the relevant parameters (the height of the transmitting antenna, the gain of the transmitting antenna, etc.) of the transmitting antenna, the height of the receiver antenna and the propagation distance are sequentially input, and the module substitutes the input parameters into the model to calculate the level value of the receiver antenna. If the calculated level value does not meet the coverage requirement (considering the requirement of the GSM-R system for the carrier-to-interference ratio C/I, the level at the receiver antenna generally needs to be greater than-80 dBm), the input parameters need to be adjusted. The designer can adjust input parameters such as the output power of the device (namely, the output power of the device is increased within the maximum transmission power range), the height of the transmitting antenna (namely, the height of the iron tower is increased or the iron tower is arranged at a place with higher terrain is selected), the gain of the transmitting antenna (namely, the antenna with higher gain is selected), and the like, and then the input parameters are substituted into the module again for calculation until the level value of the receiver antenna meeting the coverage requirement is calculated. And finally, storing the input related parameter information in a corresponding work point memory.
Further, link budget is carried out on leaky cable coverage in the tunnel through a leaky cable coverage prediction submodule according to the actual landform of the site, and the link budget method comprises the following steps:
when the designer of the embodiment performs leaky cable coverage prediction, the type of the device, the output power of the device, the length of the radio frequency cable outside the tunnel and the length of the leaky cable inside the tunnel need to be input in sequence. The leaky cable coverage prediction submodule can automatically judge the model and the hectometer loss of the needed radio frequency cable according to the length of the radio frequency cable outside the tunnel, namely a 7/8 'radio frequency coaxial cable (the hectometer loss is 3.8 dB) is adopted when the length is less than 80 meters, and a 5/4' radio frequency coaxial cable (the hectometer loss is 2.7 dB) is adopted when the length is more than or equal to 80 meters, so that the loss of the radio frequency cable outside the tunnel is calculated; similarly, the module can automatically calculate the loss of the leaky cable (the loss of one hundred meters is 2.4 dB) according to the length of the leaky cable in the tunnel. Thereby, a level value at the corresponding receiver antenna is calculated. If the calculated level value does not meet the coverage requirement, the input parameters need to be adjusted. Designers can adjust the output power of the device (namely, the output power of the device is increased within the maximum transmitting power range), the length of the radio frequency cable outside the tunnel (namely, the device is placed at a position closer to the tunnel opening), the length of the leaky cable in the tunnel and other input parameters, and then the input parameters are substituted into the module again for calculation until the level value at the antenna of the receiver meeting the coverage requirement is calculated. And finally, storing the input related parameter information in a corresponding work point memory.
And further, calling a camera to take pictures and videos at each work point according to a preset rule, and storing the pictures and videos in a memory of the corresponding work point.
Through the method and the system, designers can predict the coverage of the antenna outside the tunnel and the coverage of the leaky coaxial cable inside the tunnel according to the conditions of terrain environment and the like on a survey site, and powerful support is provided for stabilizing the position of a GSM-R base station or a digital relay equipment terrace. When the designers with insufficient experience go to the site survey, the system can play a certain guiding role and help determine the position of the field ground meeting the wireless coverage requirement. The designer can immediately generate a survey report after recording the relevant information of the GSM-R base station or the digital relay equipment on site, thereby reducing the workload of the worker and improving the working efficiency.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (6)

1. A GSM-R reconnaissance system based on terminal, its characterized in that: comprises a project creating module, a wireless coverage forecasting module, a survey information recording module and a survey report generating module,
the project creating module is used for creating project information and a work point table corresponding to a specific project, and the project information and the work point table comprise project names and work point numbers;
the wireless coverage prediction module is used for performing wireless link budget on each work point according to actual landform on site, predicting wireless coverage conditions, determining related data and storing the related data in a memory of the corresponding work point; the wireless coverage prediction module comprises an antenna coverage prediction submodule or/and a leaky cable coverage prediction submodule, wherein the antenna coverage prediction submodule is used for the link budget covered by an antenna outside a tunnel, the leaky cable coverage prediction submodule is used for the link budget covered by a leaky cable in the tunnel, the antenna coverage prediction submodule adopts an Okumura-Hata model, and calculates a level value at the antenna of the receiver according to the input field actual environment condition, the equipment type, the equipment output power, the height of a transmitting antenna, the gain of the transmitting antenna, the height of the antenna of the receiver and the propagation distance, and if the level value at the antenna of the receiver reaches the coverage requirement, the corresponding related parameter information is stored in a memory of a corresponding work point; if the calculated level value does not meet the coverage requirement, the input parameters need to be adjusted, then the level value at the antenna of the receiver is recalculated, and the input related parameter information is stored in a corresponding working point memory;
the leaky cable coverage prediction submodule adopts an engineering link model, and needs to input the type of equipment, the output power of the equipment, the length of a radio frequency cable outside a tunnel and the length of a leaky cable inside the tunnel, so as to calculate a level value at the antenna of a receiver, if the level value at the antenna of the receiver meets the coverage requirement, corresponding related parameter information is stored in a memory of a corresponding work point, if the calculated level value does not meet the coverage requirement, the input parameter needs to be adjusted, then the level value at the antenna of the receiver is recalculated, and the input related parameter information is stored in the memory of the corresponding work point;
the formula used by the leaky cable coverage prediction submodule is as follows: RXLEV = TXLEV-pasiveloss-FeederLoss-RFCableLoss-LCXLoss, where: RXLEV is the level at the antenna of the receiver; TXLEV is the output power of the device; pasiveLoss is the loss of the passive device; the FeederLoss is the feeder joint loss; RFCableLoss is the loss of the radio frequency cable outside the tunnel; LCXLoss is leaky cable loss;
the reconnaissance information recording module is used for recording data to be measured of each work point and storing the data in a memory of the corresponding work point;
the survey report generating module is used for inputting an electronic survey report template required by a corresponding project, reading the relevant information stored by each work point, and filling the relevant information in the input electronic survey report template, thereby generating a required survey report.
2. The terminal-based GSM-R survey system of claim 1, wherein: the reconnaissance information recording module is also used for calling the camera to shoot pictures and videos at each work point according to a preset rule and storing the pictures and videos in the memory of the corresponding work point.
3. A GSM-R survey method based on a terminal is characterized by comprising the following steps:
creating project information and work point tables corresponding to specific projects, wherein the project information and the work point tables comprise project names and work point numbers;
performing wireless link budget on each work point according to actual landforms of the site, predicting wireless coverage conditions, determining output power, transmitting antenna height and transmitting antenna gain of equipment, and storing related data in a memory of the corresponding work point;
performing wireless link budget on each work point according to actual landforms of sites, comprising: performing link budget on the antenna coverage outside the tunnel according to the actual topographic features of the field or performing link budget on the leaky cable coverage inside the tunnel according to the actual topographic features of the field;
performing link budget on the antenna coverage outside the tunnel according to the actual landform of the site, comprising:
adopting an Okumura-Hata model, calculating a level value at a receiver antenna according to an input field actual environment condition, an equipment type, equipment output power, a transmitting antenna height, a transmitting antenna gain, a receiver antenna height and a propagation distance, if the calculated level value at the receiver antenna does not meet a coverage requirement, adjusting an input parameter, then recalculating the level value at the receiver antenna until the level value at the receiver antenna meeting the coverage requirement is calculated, and storing input related parameter information in a corresponding work point memory;
according to the actual landform and the geomorphology of the scene, link budget is carried out on leaky cable coverage in the tunnel, and the method comprises the following steps:
an engineering link model is adopted, and the type of equipment, the output power of the equipment, the length of a radio frequency cable outside a tunnel and the length of a leaky cable inside the tunnel are input, so that a level value at the antenna position of a receiver is calculated, wherein after the length of the radio frequency cable outside the tunnel is input, a system can automatically judge the model of the required radio frequency cable, and calculate the loss of the radio frequency cable outside the tunnel; meanwhile, after the length of the leaky cable in the tunnel is input, the system can automatically calculate the loss of the leaky cable, if the calculated level value at the antenna of the receiver does not meet the coverage requirement, the input parameter needs to be adjusted, then the level value at the antenna of the receiver is recalculated until the level value at the antenna of the receiver meeting the coverage requirement is calculated, and the input related parameter information is stored in a corresponding work point memory;
the formula used by the leaky cable coverage prediction submodule is as follows: RXLEV = TXLEV-pasiveloss-FeederLoss-RFCableLoss-LCXLoss, where: RXLEV is the level at the antenna of the receiver; TXLEV is the output power of the device; pasiveLoss is the loss of the passive device; the FeederLoss is the feeder joint loss; RFCableLoss is the loss of the radio frequency cable outside the tunnel; LCXLoss is leaky cable loss;
recording the route mileage corresponding to the position of the field of each work point, the distance from the center of the route, the longitude and latitude, the height difference between the original ground and the rail surface of the field, the landform and the landform of the periphery and the information of nearby civil houses and electric power facilities, and storing the information in the memory of the corresponding work point;
and inputting an electronic survey report template required by a corresponding project, reading the relevant information stored in each work point, and filling the relevant information into the input electronic survey report template, thereby generating a required survey report.
4. A terminal-based GSM-R surveying method according to claim 3, characterized by: when the link budget is carried out on the coverage of the antenna outside the tunnel according to the actual topographic features of the site, if the calculated level value at the antenna of the receiver does not meet the coverage requirement, the output power of the equipment, the height of the transmitting antenna and the gain parameter of the transmitting antenna are adjusted, then the level value at the antenna of the receiver is recalculated until the level value at the antenna of the receiver meeting the coverage requirement is calculated, and the input related parameter information is stored in a corresponding work point memory.
5. A terminal-based GSM-R surveying method according to claim 3, characterized by: when link budget is carried out on the tunnel inner leaky cable coverage according to actual topography and landform of a site, if the calculated level value at the antenna of the receiver does not meet the coverage requirement, the parameters of the output power of the equipment, the length of the radio frequency cable outside the tunnel and the length of the leaky cable in the tunnel are adjusted, then the level value at the antenna of the receiver is recalculated until the level value at the antenna of the receiver meeting the coverage requirement is calculated, and the input related parameter information is stored in a memory of a corresponding work point.
6. A terminal-based GSM-R surveying method according to claim 3, characterized by: and calling a camera to take pictures and videos at each work point according to a preset rule, and storing the pictures and videos in a memory of the corresponding work point.
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