A method for constructing a communication system for microwave rainfall monitoring

Abstract

A method for constructing a communication system for microwave rainfall monitoring includes: acquiring regional status data of the target monitoring area, including geographical data, traffic data, and communication network data; generating system condition data based on the regional status data, including environmental constraint data generated from geographical data, key concern data generated from traffic data, and link resource data generated from communication network data; determining existing available links based on the link resource data, and determining permissible expansion links in conjunction with the environmental constraint data; determining actual expansion links in conjunction with the key concern data and permissible expansion links; and determining microwave communication rules based on existing available links and actual expansion links. This invention provides a method for constructing a communication system for microwave rainfall monitoring, which can rapidly deploy new microwave communication links in conjunction with traffic conditions, accurately monitor rainfall, and is beneficial for estimating potential severe disasters.

Description

Technical Field

[0001] This invention relates to the field of rainfall monitoring technology, specifically a method for constructing a communication system for microwave rainfall monitoring. Background Technology

[0002] Electromagnetic waves are affected by various factors such as scattering, reflection, and absorption during propagation in space. During precipitation, water droplets can strongly interfere with the transmission of electromagnetic waves. Therefore, monitoring the transmission of electromagnetic waves can also be used to monitor precipitation. The higher the frequency of the electromagnetic wave, the more susceptible it is to the influence of precipitation. Specifically, at frequencies of tens of GHz, when the frequency of the microwave signal is close to the resonance frequency of water molecules, the incident microwave signal interacting with water molecules will attenuate. The degree of signal attenuation increases with the signal frequency. Therefore, using microwave signals from communication systems to monitor water vapor can supplement existing water vapor observation networks.

[0003] In existing technologies, rainfall monitoring using microwave communication links mainly relies on existing commercial communication links, which have limited coverage and effective monitoring range. Furthermore, during actual rainfall, even within the same city, rainfall intensity can vary significantly between different areas, making effective monitoring difficult. On the other hand, the disaster consequences of heavy rainfall are closely related to traffic conditions; people in transit are more vulnerable, and fixed communication links cannot be adjusted according to traffic conditions, making it difficult to estimate severe disasters. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method for constructing a communication system for microwave rainfall monitoring. This method enables the rapid deployment of new microwave communication links in conjunction with traffic conditions, allowing for accurate monitoring of rainfall and facilitating the estimation of potential severe disasters.

[0005] To achieve the above objectives, the specific solution adopted by the present invention is as follows: a method for constructing a communication system for microwave rainfall monitoring, comprising the following steps:

[0006] Acquire regional status data of the monitoring target area, including geographic data, traffic data, and communication network data; generate system condition data based on the regional status data, including environmental constraint data generated from geographic data, key focus data generated from traffic data, and link resource data generated from communication network data;

[0007] Based on link resource data, existing available links are determined, and combined with environmental constraint data, links that can be expanded are determined.

[0008] The actual expansion links are determined by combining key data and permissible expansion links;

[0009] Microwave communication rules are determined based on existing available links and actual expansion links.

[0010] As a further optimization of the above-mentioned communication system construction method for microwave rainfall monitoring: the geographic data includes three-dimensional geological sub-data and ground building sub-data, the traffic data includes traffic route sub-data and traffic time sub-data, and the communication network data includes link node sub-data and link load sub-data. The three-dimensional geological sub-data, ground building sub-data, and traffic route sub-data have a first correlation based on geographic coordinates, and the traffic time sub-data, link node sub-data, and link load sub-data have a second correlation with respect to time.

[0011] As a further optimization of the above-mentioned communication system construction method for microwave rainfall monitoring, the specific method for generating the environmental constraint data includes:

[0012] Multiple spatial data points were determined based on 3D geological sub-data and ground building sub-data;

[0013] The portion of spatial data points whose height values ​​exceed a preset first threshold is selected as candidate high points;

[0014] The candidate high points are grouped based on the distance between adjacent candidate high points to obtain multiple high point groups;

[0015] A three-dimensional obstacle model was fitted based on the high point group;

[0016] By combining all the three-dimensional obstacle models, environmental constraint data is obtained.

[0017] As a further optimization of the aforementioned communication system construction method for microwave rainfall monitoring, specific methods for generating key data include:

[0018] The traffic route sub-data is fused based on the traffic time sub-data to obtain the traffic location and the traffic load corresponding to the traffic location with respect to time.

[0019] Traffic locations where traffic load exceeds a preset second threshold will be used as the baseline data for attention.

[0020] Extended baseline data is generated by expanding the baseline data based on traffic location.

[0021] The extended baseline data is then further fused to generate data of key interest.

[0022] As a further optimization of the above-mentioned communication system construction method for microwave rainfall monitoring, the specific method for generating the link resource data includes:

[0023] Construct a node resource graph based on all communication nodes in the link node sub-data;

[0024] Based on the sending and receiving characteristics of communication nodes, directed edges are added to the node resource graph to connect two communication nodes.

[0025] Obtain historical communication data for each communication node, and determine the node load at any given time based on the historical communication data;

[0026] Delete communication nodes whose node load exceeds a preset third threshold, and delete the corresponding directed edges;

[0027] Link resource data is generated based on the remaining part of the node resource graph. The link resource data includes multiple communication links, and each communication link includes two communication nodes that can communicate and the communication direction between the two communication nodes.

[0028] As a further optimization of the above-mentioned communication system construction method for microwave rainfall monitoring, the specific methods for determining existing available links based on link resource data include:

[0029] Two communication nodes with shared historical communication data and their communication directions are combined into an existing, usable link.

[0030] The specific methods for determining the allowable expansion links include:

[0031] The geographical coordinates of communication nodes are used to map link resource data into environmental constraint data;

[0032] Assess the degree of interference of the three-dimensional obstacle model on the communication links in the link resource data;

[0033] All communication links with interference levels below the preset fourth threshold are recombined to obtain links that can be expanded.

[0034] As a further optimization of the above-mentioned communication system construction method for microwave rainfall monitoring, the method for determining the actual expansion link includes:

[0035] Based on the time frame, allowable expansion links are associated with key data of concern;

[0036] With a focus on key data, allowable expansion links are grouped based on geographic coordinates;

[0037] Adjust the allowable expansion links after grouping based on time, and determine the actual expansion links based on the verification results.

[0038] As a further optimization of the above-mentioned communication system construction method for microwave rainfall monitoring: the microwave communication rules include microwave communication plans that correspond one-to-one with existing available links and actual expansion links, and the microwave communication plans include communication times and communication content.

[0039] Beneficial effects: This invention can integrate existing communication network resources and quickly deploy new microwave communication links based on traffic conditions during rainfall. It can focus on monitoring densely populated traffic locations and effectively predict potential serious disasters during subsequent monitoring, thus ensuring the safety of people and property as much as possible. Furthermore, this invention also comprehensively considers factors such as mountains, hills, and buildings that may interfere with microwave communication links, as well as the load of communication nodes, to ensure that the newly deployed microwave communication links can accurately monitor rainfall. Attached Figure Description

[0040] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Please see Figure 1 A method for constructing a communication system for microwave rainfall monitoring, comprising S1 to S5.

[0043] S1. Acquire regional status data of the monitoring target area, including geographic data, traffic data, and communication network data. Geographic data includes 3D geological sub-data and ground structure sub-data. 3D geological sub-data mainly includes geographic information data of mountains and hills on the ground, while ground structure sub-data mainly includes architectural information data of man-made buildings on the ground. Traffic data includes traffic route sub-data and traffic time sub-data. Traffic route sub-data mainly refers to the combination of all road segments traversed from a certain starting point to a certain ending point within the monitoring target area. Traffic time sub-data mainly refers to the travel time of all traffic participants corresponding to the traffic route sub-data from a certain starting point to a certain ending point. Therefore, both traffic route sub-data and traffic time sub-data correspond to two different locations within the monitoring target area: the starting point and the ending point. Communication network data includes link node sub-data and link load sub-data. Link node sub-data mainly refers to all communication nodes capable of microwave communication. Communication nodes can be transmitting nodes, receiving nodes, or full-duplex nodes with both transmitting and receiving functions. Link load sub-data mainly refers to the communication load of each communication node at different times. Among the geographic data, transportation data, and communication network data, the 3D geological sub-data, ground building sub-data, and transportation route sub-data have a first correlation based on geographic coordinates, while the transportation time sub-data, link node sub-data, and link load sub-data have a second correlation based on time.

[0044] S2. Generate system condition data based on regional status data. The system condition data includes environmental constraint data generated based on geographic data, key focus data generated based on traffic data, and link resource data generated based on communication network data.

[0045] The specific methods for generating environmental constraint data include S211 to S215.

[0046] S211. Determine multiple spatial data points based on 3D geological sub-data and ground building sub-data. The 3D geological sub-data itself consists of a large number of spatial data points with 3D geographic coordinates, which is existing technology. Ground buildings are also located based on geographic coordinates during the design process. On this basis, the ground building sub-data can also be converted into multiple spatial data points based on the size data and location of the ground buildings.

[0047] S212. The portions of spatial data points whose height values ​​exceed a preset first threshold are selected as candidate high points. Because microwave communication has weak penetration capabilities, mountains, hills, and ground structures located along the communication link can cause significant interference to the microwave communication process. Therefore, this invention primarily filters out portions from the three-dimensional geological sub-data and ground structure sub-data that may adversely affect the communication link. In the spatial data points, the higher the portion, the more likely the corresponding mountains, hills, or buildings are to obstruct the communication link. Therefore, it is necessary to filter out these portions whose height values ​​exceed a preset first threshold and select them as candidate high points.

[0048] S213. Group the candidate high points based on the distance between adjacent candidate high points to obtain multiple high point groups. Since mountains, hills, and buildings all have a certain three-dimensional shape, it's impossible to generate many candidate high points. Therefore, among the selected candidate high points, several adjacent candidate high points may correspond to the same mountain, hill, or building. Based on this, the present invention groups all candidate high points based on the distance between adjacent candidate high points. Specifically, for any two adjacent candidate high points, if the distance between them is less than a preset distance threshold, then these two candidate high points may correspond to the same mountain, hill, or building. The grouping process can be completed by traversing all candidate high points. After grouping, in a high point group, the distance between any candidate high point and at least one other candidate high point is less than the distance threshold. It should also be noted that the shape of most buildings can be simplified to a cuboid. If two adjacent buildings are close together, it may be necessary to group the candidate high points corresponding to these two buildings into the same high point group. However, for such buildings that are close together, the impact on the communication link may be holistic. Specifically, it is difficult to build a microwave communication link, and the radiated signal can pass exactly between the two buildings. Therefore, for several buildings that are close together, it is not a problem to group their corresponding candidate high points into the same high point group, and it can reduce the complexity of grouping.

[0049] S214. Fit a 3D obstacle model based on a high-point group. Specifically, fit all candidate high points in the same high-point group to form a 3D surface. Adjacent candidate high points can be connected by straight lines. Then, use the 3D surface as the top surface and the projection of the 3D surface onto the ground as the bottom surface. Connect the edges of the top and bottom surfaces to obtain the 3D obstacle model. Obviously, before constructing the 3D obstacle model, the ground should be determined based on the 3D geological data of the monitoring target area. The determined ground is a plane.

[0050] S215. Combine all three-dimensional obstacle models to obtain environmental constraint data. The three-dimensional obstacle models obtained in S214 represent factors that may interfere with the communication link. Therefore, by fusing all the three-dimensional obstacle models, environmental constraint data can be obtained. This environmental constraint data is used to characterize the potential interference that the geographical environment of the monitoring target area may cause to the communication link.

[0051] The specific methods for generating data of interest include S221 to S224.

[0052] S221. Based on the traffic time sub-data, the traffic route sub-data is fused to obtain traffic locations and the traffic load corresponding to each traffic location at a given time. Since both the traffic time sub-data and the traffic route sub-data correspond to a start point and an end point, and traffic participants will pass through many locations between the start point and the end point, these locations, combined with the start point and the end point, form multiple traffic locations. Since the time it takes for traffic participants to arrive at each traffic location is different, the number of traffic participants at a certain traffic location at a certain time is recorded as the traffic load. That is, one traffic location corresponds to multiple traffic loads, and each traffic load corresponds to a time.

[0053] S222. Traffic locations where the traffic load exceeds a preset second threshold are used as reference data for attention. When the traffic load is high, it is more likely to cause personal and property damage in the event of a natural disaster such as heavy rainfall. Therefore, it is more necessary to pay attention to traffic locations with high traffic load. When any traffic load at a traffic location exceeds the second threshold, it indicates that there are many traffic participants at that traffic location at a certain time.

[0054] S223. Extend the reference data based on traffic location to generate extended reference data. Since traffic location is part of the traffic route sub-data, representing the start, end, or intermediate point within the traffic route sub-data, a traffic location with a traffic load exceeding a second threshold is designated as the target location. Traffic participants currently at the target location may have moved from different old traffic locations or moved to different new traffic locations. At the same time, the traffic load at these old and new traffic locations may not reach the second threshold and therefore will not be identified as traffic reference data. However, they are closely related to the target location. Therefore, the traffic reference data is extended by associating and integrating other traffic locations within a one-hop range with the reference data to form extended reference data.

[0055] It should be noted that, in order to expand the baseline data of interest, in this invention, traffic locations are mainly monitored at road intersections in the target area. If there are commercial institutions, educational institutions, or medical institutions next to the traffic locations that may generate a large number of traffic participants, the traffic locations can be assigned a certain weight based on the size of these institutions. For traffic locations that are not determined as baseline data of interest or extended baseline data, they can be added to the extended baseline data based on their weights.

[0056] S224. The extended baseline data is further fused to generate key focus data. After generating the extended baseline data, since it is also based on traffic location, different extended baseline data may be interconnected or even overlap. Therefore, these extended baseline data can be further fused based on traffic location to obtain a larger area and fewer data points of key focus data for subsequent processing. It should be noted that because traffic conditions are dynamic, the generated key focus data, extended baseline data, and key focus data are all time-dependent.

[0057] The specific methods for generating link resource data include S231 to S235.

[0058] S231. Construct a node resource graph based on all communication nodes in the link node sub-data.

[0059] S232. Based on the transmit and receive characteristics of communication nodes, add directed edges to the node resource graph. Directed edges are used to connect two communication nodes. Considering that some communication nodes can only perform signal transmission and some can only perform signal reception, it is necessary to add directed edges to represent the communication direction between two communication nodes.

[0060] S233. Obtain historical communication data for each communication node, and determine the node load for a given time based on the historical communication data. Node load, similar to traffic load, is time-dependent; that is, a communication node may have a high load at some times and a low load at others.

[0061] S234. Delete communication nodes whose node load exceeds a preset third threshold, and delete the corresponding directed edges. The purpose of this invention is to construct a communication system capable of monitoring rainfall through microwave communication. Therefore, it is necessary to ensure sufficient reliability of the microwave communication link, i.e., to successfully complete rainfall monitoring at any time. The main method for monitoring rainfall using microwave communication is based on inverting rainfall intensity through signal attenuation. Therefore, it is necessary to eliminate factors causing signal instability due to excessive node load to ensure the accuracy of the monitoring results. By deleting communication nodes whose node load exceeds the third threshold at any given time, it can be ensured that none of the remaining communication nodes will have excessive node load. Correspondingly, the directed edges connected to the communication nodes are deleted.

[0062] S235. Generate link resource data based on the remaining part of the node resource graph. The link resource data includes multiple communication links, and each communication link includes two communication nodes that can communicate and the communication direction between the two communication nodes. Since the remaining part of the node resource graph still includes communication nodes and directed edges connecting two communication nodes, the communication links can be directly determined based on the directed edges.

[0063] S3. Determine existing available links based on link resource data, and determine the links that can be expanded in accordance with environmental constraint data.

[0064] The specific method for determining existing available links based on link resource data includes: combining two communication nodes with shared historical communication data and their communication directions into an existing available link. Among the determined communication links, some may have already been in communication, while others may only have the conditions for communication but have not yet communicated. Therefore, only communication links with shared historical communication data are considered existing available links.

[0065] The specific methods for determining the permissible expansion links include S31 to S33.

[0066] S31. Based on the geographical coordinates of the communication nodes, the link resource data is mapped to the environmental constraint data.

[0067] S32. Evaluate the degree of interference of the 3D obstacle model on the communication link in the link resource data. When the communication link between two communication nodes passes through the 3D obstacle model, the mountains, hills or buildings corresponding to the 3D obstacle model may adversely affect the communication link, that is, interfere with the normal communication process of the communication link. Therefore, it is necessary to evaluate the degree of interference of the 3D obstacle model on the communication link.

[0068] S33. Recombine all communication links with interference levels below the preset fourth threshold to obtain expandable links. After removing the communication links that are severely affected by the 3D obstacle model, the remaining communication links are less likely to be affected by the mountains, hills, or buildings corresponding to the 3D obstacle model, and can communicate normally, thus ensuring accuracy during rainfall monitoring.

[0069] S4. Determine the actual expansion links by combining the key data and the allowable expansion links.

[0070] The methods for determining the actual expansion links include S41 to S43.

[0071] S41. Associate the allowed expansion links with key data based on time.

[0072] S42. Grouping permissible expansion links based on geographic coordinates, targeting key data points. This means aggregating permissible expansion links above the traffic locations corresponding to the key data points into a single group.

[0073] S43. Adjust the permissible expansion links after grouping based on time, and determine the actual expansion links based on the verification results. Since the key data is time-related, it is necessary to adjust the permissible expansion links based on time. Specifically, the number of permissible expansion links corresponding to each key data point should be approximately equal. For permissible expansion links corresponding to multiple key data points, adjust their final correspondence to ensure that the number of permissible expansion links corresponding to each key data point at a given time is basically uniform, avoiding the situation where some key data points correspond to too few permissible expansion links, which would prevent the successful monitoring of rainfall.

[0074] S5. Determine microwave communication rules based on existing available links and actual expansion links. Microwave communication rules include microwave communication plans corresponding one-to-one with existing available links and actual expansion links. The microwave communication plans include communication times and communication content. Communication content can be dedicated to rainfall monitoring or commercial communication content, selected based on actual circumstances.

[0075] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for constructing a communication system for microwave rainfall monitoring, characterized by, The method comprises the following steps: acquiring regional state data of a monitoring target region, the regional state data comprising geographical data, traffic data and communication network data; generating system condition data based on the regional state data, the system condition data comprising environment constraint data generated based on the geographical data, focus data generated based on the traffic data and link resource data generated based on the communication network data; determining existing available links based on the link resource data and determining allowable expansion links in combination with the environment constraint data; determining actual expansion links in combination with the focus data and the allowable expansion links; determining microwave communication rules based on the existing available links and the actual expansion links; the geographical data comprises three-dimensional geological data and ground building data, the traffic data comprises traffic route data and traffic time data, and the communication network data comprises link node data and link load data, the three-dimensional geological data, the ground building data and the traffic route data have a first association relationship based on geographical coordinates, and the traffic time data, the link node data and the link load data have a second association relationship with respect to time; a specific method for generating the environment constraint data comprises: determining a plurality of spatial data points based on the three-dimensional geological data and the ground building data; regarding a part of the spatial data points with a height value exceeding a preset first threshold value as candidate high points; grouping the candidate high points based on distances between adjacent candidate high points to obtain a plurality of high point groups; fitting a three-dimensional obstacle model based on the high point groups; combining all the three-dimensional obstacle models to obtain the environment constraint data; a specific method for generating the focus data comprises: fusing the traffic route data based on the traffic time data to obtain traffic positions and traffic loads corresponding to the traffic positions with respect to time; regarding a part of the traffic positions with traffic loads exceeding a preset second threshold value as focus reference data; extending the focus reference data based on the traffic positions to generate extended reference data; re-fusing the extended reference data to generate the focus data; a specific method for generating the link resource data comprises: constructing a node resource graph based on all communication nodes in the link node data; adding directed edges in the node resource graph based on the transmission characteristics of the communication nodes, the directed edges being used to connect two communication nodes; acquiring historical communication data of each communication node and determining node loads with respect to time based on the historical communication data; deleting the communication nodes with node loads higher than a preset third threshold value and deleting the corresponding directed edges; generating the link resource data based on the remaining part of the node resource graph, the link resource data comprising a plurality of communication links, each communication link comprising two communication nodes capable of communication and a communication direction between the two communication nodes; a specific method for determining the existing available links based on the link resource data comprises: assembling two communication nodes with common historical communication data and a communication direction into an existing available link; a specific method for determining the allowable expansion links comprises: mapping the link resource data into the environment constraint data based on geographical coordinates of the communication nodes; evaluating the interference degree of the three-dimensional obstacle models on the communication links in the link resource data; Recombine the communication links with the interference degree lower than the fourth threshold value to obtain the allowed expansion links; The determination method of the actual expansion link comprises: Associate the allowed expansion links with the focus data based on the time; Group the allowed expansion links based on the geographic coordinates with the focus data as the target; Adjust the grouped allowed expansion links based on the time, and determine the actual expansion link based on the check result.

2. A method of constructing a communication system for microwave rainfall monitoring as claimed in claim 1, wherein, The microwave communication rule comprises microwave communication plans corresponding to the existing available links and the actual expansion link one by one, and the microwave communication plan comprises a communication time and a communication content.

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