CN110661582A - Method for performing radio wave communication in mountains and mountains by computer simulation - Google Patents

Method for performing radio wave communication in mountains and mountains by computer simulation Download PDF

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CN110661582A
CN110661582A CN201910934505.8A CN201910934505A CN110661582A CN 110661582 A CN110661582 A CN 110661582A CN 201910934505 A CN201910934505 A CN 201910934505A CN 110661582 A CN110661582 A CN 110661582A
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terrain
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邹长虹
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Beijing Institute of Electronic System Engineering
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04B17/0087—Monitoring; Testing using service channels; using auxiliary channels using auxiliary channels or channel simulators
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    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
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    • H04B17/3911—Fading models or fading generators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/391—Modelling the propagation channel
    • H04B17/3912—Simulation models, e.g. distribution of spectral power density or received signal strength indicator [RSSI] for a given geographic region

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Abstract

The invention discloses a method for performing radio wave communication in mountainous and mountainous terrain by computer simulation, which comprises the following steps: s1, loading a three-dimensional digital map; s2, setting the positions of a communication transmitter and a receiver on the three-dimensional digital map; s3, setting the working frequency of the communication equipment used by the communication transmitter and the receiver; s4, forming a terrain elevation profile between the communication transmitter and the receiver on the three-dimensional digital map; s5, judging the mountain and mountain terrain according to the three-dimensional digital map and the terrain elevation profile; s6, calculating a terrain attenuation correction factor Lambda; s7, calculating the free space transmission loss of radio waves; s8, calculating the radio wave transmission loss according to the terrain attenuation correction factor Lambda and the free space transmission loss; s9, performing analog communication using the radio wave transmission loss as an attenuation value of the radio wave communication.

Description

Method for performing radio wave communication in mountains and mountains by computer simulation
Technical Field
The invention relates to a command system communication test method, in particular to a method for simulating radio wave communication in mountains and mountains by a computer.
Background
In the existing situation of communication test of a command system, communication professionals carry communication equipment to carry out the communication test at a specified communication test site, and special tests can be continued according to the terrain conditions of the test site and the information of the communication equipment. However, since the terrain conditions of the test site are very complex and dangerous, the special test mode which needs to be examined by communication personnel on the spot is very dangerous, which wastes manpower and material resources and increases the test cost.
How to ensure the life safety of communication personnel, efficiently and quickly complete special tests, save cost and reduce the consumption of manpower and material resources, and in order to solve one or more of the problems, a method for simulating radio wave communication in mountainous and mountainous terrains by a computer is needed.
Disclosure of Invention
An object of the present invention is to provide a method for performing radio wave communication in mountainous and mountainous terrain by computer simulation, so as to solve the problems in the prior art that the communication test of the command system cannot guarantee the life safety of communication personnel, the virtual simulation cannot be performed on the spot, the manpower and material resources are wasted, and the test cost is increased.
A second object of the present invention is to provide an apparatus for computer simulation of radio wave communication in mountainous and mountainous terrain.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for computer simulation of radio wave communications in a mountainous terrain, the method comprising the steps of:
s1, loading a three-dimensional digital map;
s2, setting the positions of a communication transmitter and a receiver on the three-dimensional digital map;
s3, setting the working frequency of the communication equipment used by the communication transmitter and the receiver;
s4, forming a terrain elevation profile between the communication transmitter and the receiver on the three-dimensional digital map;
s5, judging the mountain and mountain terrain according to the three-dimensional digital map and the terrain elevation profile;
s6, calculating a terrain attenuation correction factor Lambda;
s7, calculating the free space transmission loss of radio waves;
s8, calculating the radio wave transmission loss according to the terrain attenuation correction factor Lambda and the free space transmission loss;
s9, performing analog communication using the radio wave transmission loss as an attenuation value of the radio wave communication;
wherein, the step S6 specifically includes the following steps:
s61: calculating the minimum Fresnel radius F0；
Figure BDA0002221174380000021
S62: calculating a terrain parameter mu;
wherein k is d1/d；α＝Δy/F0；L＝r/d；
Where k is the distance coefficient, d1The length of the vertical distance from the transmitter to the mountains and the ground; d is the distance from the transmitter to the receiver; alpha is a relative height coefficient; Δ y is the height of the vertical distance of the mountains from the ground; f0Minimum fresnel radius; λ is the radio wave wavelength; l is a mountain depth coefficient; r is the depth of mountains;
s63: calculating relative clearanceWherein Hc is the radio wave clearance;
s64; establishing a terrain parameter-relative clearance relation;
s65: and calculating a terrain attenuation correction factor Lambda according to the established terrain parameter-relative clearance relation.
Preferably, the terrain elevation profile is generated by a computer recognizing the three-dimensional digital map or manually inputting information according to the three-dimensional digital map.
Preferably, the terrain elevation profile and the three-dimensional digital map comprise terrain information, landform information, altitude information, distance information and obstacle information.
Preferably, the terrain parameter μ comprises μ ═ 1; μ ═ 0 and μ ∞.
Preferably, the step S7 calculates the radio wave free space transmission lossLbf，Lbf＝32.45+20lgf(MHz)+20lgd(km)(db)，
Wherein L isbfFor the radio wave free space transmission loss, d is the distance from the transmitter to the receiver, and f is the operating frequency of the communication device.
Preferably, the step S8 calculates the radio wave transmission loss Lb，Lb＝Lbf+Λ；
Wherein the radio wave transmission loss Lb(ii) a Radio wave free space transmission loss Lb(ii) a A terrain attenuation correction factor Λ.
In order to achieve the second purpose, the invention adopts the following technical scheme:
an apparatus for computer simulation of radio wave communications over mountainous terrain, the apparatus comprising:
the loading module is used for loading the three-dimensional digital map;
the setting module is used for setting the positions of a communication transmitter and a receiver on the three-dimensional digital map and setting the working frequency of communication equipment used by the communication transmitter and the receiver;
a terrain elevation profile module for forming a terrain elevation profile between the communication transmitter and the receiver on the three-dimensional digital map;
the terrain judging module is used for judging the mountains and mountains terrain according to the three-dimensional digital map and the terrain elevation sectional view;
the correction factor calculation module is used for calculating a terrain attenuation correction factor lambda;
the free space transmission loss calculation module is used for calculating the free space transmission loss of radio waves;
the radio wave transmission loss calculating module is used for calculating the radio wave transmission loss;
an analog communication module for performing analog communication using the radio wave transmission loss as an attenuation value of the radio wave communication;
wherein; the correction factor calculation module further comprises:
the calculating unit is used for calculating a first Fresnel radius, a terrain parameter and a relative clearance of radio waves;
and the terrain parameter-relative clearance relation unit is used for establishing a terrain parameter-relative clearance relation and calculating a terrain attenuation correction factor lambda.
Preferably, a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1-6.
Preferably, a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method according to any of claims 1-6 when executing the program.
The invention has the following beneficial effects:
the invention adopts a method of simulating radio wave communication in mountainous and mountainous terrains by a computer, replaces communication professionals with communication equipment to carry out special tests at appointed communication test sites, and effectively ensures the life safety of the communication personnel. The invention can efficiently and quickly complete the integration and calculation of the collected information of the special test, save the cost of the communication test and reduce the consumption of manpower and material resources.
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The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 shows a schematic view of the diffraction of mountains;
fig. 2 shows a topographic parameter-relative clearance relationship:
FIG. 3 shows a schematic structural diagram of a computer device;
reference numerals: Λ terrain attenuation correction factor; f0A minimum Fresnel radius; f1A first Fresnel radius; a μ topographic parameter; k distance coefficient; d1The length of the vertical distance from the transmitter to the mountains and mountains to the ground; d distance of transmitter to receiver; a relative height coefficient; the height of the mountains of Δ y from the ground; λ is the radio wave wavelength; l is a mountain depth coefficient; r is the depth of mountains; p relative clearance; hc radio wave clearance; l isbfRadio wave free space transmission loss; radio wave transmission loss Lb(ii) a f is the working frequency of the communication equipment; a transmitter T; a receiver R; transmitter antenna height h1(ii) a Height h of receiver antenna2(ii) a Height of the terrain H1(ii) a Height of the terrain H2(ii) a A computer device 12; an external device 14; a processing unit 16; a bus 18; a network adapter 20; an output (I/O) interface 22; a system memory 28; a Random Access Memory (RAM) 30; a cache memory 32; a storage system 34; a utility tool 40; a program module 42.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
A method for computer simulation of radio wave communications in a mountainous terrain, the method comprising the steps of:
s1, loading a three-dimensional digital map;
the three-dimensional digital map comprises terrain information, landform information, height information, distance information and obstacle information.
The three-dimensional digital map can select Baidu, Gaode, Google or other three-dimensional digital map data packets downloaded from the network and containing the specific information.
S2 communicating the transmitter and receiver positions on the three-dimensional digital map,
the user drags an icon from an icon bar through a mouse to add a communication transmitter and receiver model, or the communication transmitter and the receiver are defined directly on a three-dimensional digital map through mouse selection points, and communication personnel are simulated to arrive at positions for field investigation and communication test.
S3, setting the working frequency of the communication equipment used by the communication transmitter and the receiver; the communication transmitter uses communication equipment working frequency which is the same as that of the communication equipment of the receiver;
when the mouse clicks the communication transmitter and the receiver, a setting frame can be popped up, the working frequency of the used communication equipment is respectively set in the setting frame, and the communication personnel can be simulated to use the communication equipment on the spot to adjust the working frequency of the communication equipment.
S4, forming a terrain elevation profile between the communication transmitter and the receiver on the three-dimensional digital map; the topographic elevation profile may be formed by automatically identifying the topographic profile by a computer, or may be manually drawn by a computer on a three-dimensional digital map (e.g., by setting up an elevation profiling system using the GUI function of MATLAB to extract the topographic elevation profile between any two points on the earth, etc.). The terrain elevation profile comprises terrain information, landform information, altitude information, distance information and obstacle information.
S5, judging the mountain and mountain terrains according to the three-dimensional digital map and the elevation profile of the terrains;
on a three-dimensional digital map, the closely adjacent mountain terrain located between a communication transmitter and receiver is identified as mountain terrain.
S6, calculating a terrain attenuation correction factor Lambda;
step S6 specifically includes the following steps:
s61: calculating the minimum Fresnel radius F0；
Figure BDA0002221174380000051
S62: calculating a terrain parameter mu;
Figure BDA0002221174380000052
wherein k is d1/d；α＝Δy/F0；L＝r/d；
Where k is the distance coefficient, d1The length of the vertical distance from the transmitter to the mountains and the ground; d is the distance from the transmitter to the receiver; alpha is a relative height coefficient; Δ y is the height of the vertical distance of the mountains from the ground; f0Is the minimum fresnel radius; λ is the radio wave wavelength; l is a mountain depth coefficient; r is the depth of mountains;
s63: calculating relative clearance
Figure BDA0002221174380000053
Wherein Hc is the radio wave clearance; f0Is the minimum Nefel radius
S64; establishing a terrain parameter-relative clearance relation;
s65: calculating a terrain attenuation correction factor Lambda according to the established terrain parameter-relative clearance relation;
when the transmitting and receiving antenna is lowered, the p is a negative value, diffraction loss is generated, and the terrain attenuation correction factor Lambda can be obtained according to the terrain parameter-relative clearance relation according to the values of mu and p. The topographic parameter μ includes μ ═ 1; the corresponding topographic parameter-relative clearance relationships in three different cases, μ ═ 0 and μ ∞, are analyzed for the different cases. As shown in fig. 2, μ ═ 1 is shown; the terrain parameter-relative clearance relationships corresponding to the three different cases, μ ═ 0 and μ ∞ can be calculated from the map as the case may be.
Wherein the minimum Fresnel radius F is calculated0When the topographic parameter mu is relative to the clearance, a mountains and mountains diffraction diagram can be constructed according to the three-dimensional digital map and the topographic elevation profile; as shown in FIG. 1, the transmitter antenna height h is set at the transmitter T1Height of the terrain H1Setting the receiver antenna height h at the receiver R2Height of the terrain H2A point M is taken at the chain mountains, the radio wave clearance Hc is the vertical distance between the connecting line of the highest point of the transmitter antenna and the highest point of the receiver antenna and the highest point of the M, and d is the distance from the transmitter to the receiver. The mountains and mountains diffraction schematic diagram comprises position information, distance information, terrain information, height information and angle information; and calculating according to the required information.
S7, calculating the free space transmission loss of radio waves;
the calculation formula is Lbf，Lbf＝32.45+20lgf(MHz)+20lgd(km)(db)，
Wherein L isbfFor radio wave free space transmission loss, d isThe distance from the transmitter to the receiver, f, is the operating frequency of the communication device.
S8, calculating radio wave transmission loss Lb(ii) a The calculation formula is Lb＝Lbf+Λ；
Wherein, radio wave transmission loss Lb(ii) a Radio wave free space transmission loss Lb(ii) a A terrain attenuation correction factor Λ.
Through the steps of S6-S8, the radio wave transmission loss is determined efficiently and quickly, and the communication personnel can simulate the theoretical radio wave transmission loss at the test site indoors without performing a test on the spot. Personnel injury caused by dangerous places, dangerous weather or sudden disasters is reduced, and cost consumption is reduced.
S9, the radio wave transmission loss obtained after the steps S1-S8 is carried out is used as an attenuation value to be connected in series to a communication transmitter and a communication receiver to carry out a communication test.
The method for performing radio wave communication in mountainous and mountainous terrains by adopting computer simulation can realize the simulation of radio wave communication in a VHF frequency band (a very high frequency band of 30MHz-300 MHz); and can simulate radio wave communication in UHF frequency band (ultrahigh frequency 300MHz-3000 MHz). The universality of the frequency band is realized.
The technical scheme formed by the aid of the communication devices S1-S9 jointly adopts a method of simulating radio wave communication in mountainous and mountainous terrains by a computer, replaces an experiment mode that communication professionals carry communication equipment to perform special experiments at specified communication test places, and effectively guarantees life safety of the communication personnel. The invention can efficiently and quickly complete the integration and calculation of the collected information of the special test, save the cost of the communication test and reduce the consumption of manpower and material resources.
The invention also discloses a device for performing radio wave communication in mountains and mountains terrain by computer simulation, which comprises:
the loading module is used for loading the three-dimensional digital map; the three-dimensional digital map can select Baidu, Gaode, Google or other three-dimensional digital map data packets which are downloaded from the network and comprise the specific information;
the setting module is used for setting the positions of the communication transmitter and the receiver on the three-dimensional digital map and setting the working frequency of communication equipment used by the communication transmitter and the receiver;
a terrain elevation profile module for forming a terrain elevation profile between the communications transmitter and the receiver on the three-dimensional digital map;
the terrain judging module is used for judging the mountains and mountains terrain according to the three-dimensional digital map and the terrain elevation profile;
the correction factor calculation module is used for calculating a terrain attenuation correction factor lambda;
the free space transmission loss calculation module is used for calculating the free space transmission loss of radio waves;
the radio wave transmission loss calculating module is used for calculating the radio wave transmission loss;
an analog communication module for performing analog communication using the radio wave transmission loss as an attenuation value of the radio wave communication;
wherein; the correction factor calculation module further comprises:
the calculating unit is used for calculating a first Fresnel radius, a terrain parameter and a relative clearance of radio waves;
wherein the minimum Fresnel radius F0(ii) a Is calculated by the formula
Figure BDA0002221174380000071
The topographic parameter mu is calculated according to the formula;
Figure BDA0002221174380000072
wherein k is d1/d；α＝Δy/F0；L＝r/d；
Where k is the distance coefficient, d1The length of the vertical distance from the transmitter to the mountains and the ground; d is the distance from the transmitter to the receiver; alpha is a relative height coefficient; Δ y is the height of the vertical distance of the mountains from the ground; f0Minimum fresnel radius; λ is the radio wave wavelength; l is a mountain depth coefficient; r is the depth of mountains；
The relative clearance calculation formula is as follows:
Figure BDA0002221174380000073
wherein Hc is the radio wave clearance; minimum Fresnel radius F0；
And the terrain parameter-relative clearance relation unit is used for establishing a terrain parameter-relative clearance relation and calculating a terrain attenuation correction factor lambda.
By using the device, an experiment mode that communication professionals need to carry communication equipment to carry out special tests at specified communication test places is replaced, and the life safety of the communication personnel is effectively ensured. The invention can efficiently and quickly complete the integration and calculation of the collected information of the special test, save the cost of the communication test and reduce the consumption of manpower and material resources.
Another embodiment of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements: s1, loading a three-dimensional digital map; s2, setting the positions of a communication transmitter and a receiver on the three-dimensional digital map; s3, setting the working frequency of the communication equipment used by the communication transmitter and the receiver; s4, forming a terrain elevation profile between the communication transmitter and the receiver on the three-dimensional digital map; s5, judging the mountain and mountain terrains according to the three-dimensional digital map and the elevation profile of the terrains; s6, calculating a terrain attenuation correction factor Lambda; s7, calculating the free space transmission loss of radio waves; s8, calculating the radio wave transmission loss according to the terrain attenuation correction factor Lambda and the free space transmission loss; s9, analog communication is performed using the radio wave transmission loss as an attenuation value of the radio wave communication.
In practice, the computer-readable storage medium may take any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present embodiment, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + +, or the like, as well as conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
As shown in fig. 3, another embodiment of the present invention provides a schematic structural diagram of a computer device. The computer device 12 shown in FIG. 3 is only an example and should not impose any limitation on the scope of use or functionality of embodiments of the present invention.
As shown in FIG. 3, computer device 12 is in the form of a general purpose computing device. The components of computer device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 that couples various system components including the system memory 28 and the processing unit 16.
Bus 18 represents one or more of any of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, and a processor or local bus using any of a variety of bus architectures. By way of example, such architectures include, but are not limited to, Industry Standard Architecture (ISA) bus, micro-channel architecture (MAC) bus, enhanced ISA bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.
Computer device 12 typically includes a variety of computer system readable media. Such media may be any available media that is accessible by computer device 12 and includes both volatile and nonvolatile media, removable and non-removable media.
The system memory 28 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM)30 and/or cache memory 32. Computer device 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 3, and commonly referred to as a "hard drive"). Although not shown in FIG. 3, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 18 by one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
A program/utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may comprise an implementation of a network environment. Program modules 42 generally carry out the functions and/or methodologies of the described embodiments of the invention.
Computer device 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), with one or more devices that enable a user to interact with computer device 12, and/or with any devices (e.g., network card, modem, etc.) that enable computer device 12 to communicate with one or more other computing devices. Such communication may be through an input/output (I/O) interface 22. Also, computer device 12 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network such as the Internet) via network adapter 20. As shown in FIG. 3, the network adapter 20 communicates with the other modules of the computer device 12 via the bus 18. It should be understood that although not shown in FIG. 3, other hardware and/or software modules may be used in conjunction with computer device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
The processor unit 16 executes programs stored in the system memory 28 to perform various functional applications and data processing, such as implementing a method for computer simulation of radio wave communications in mountainous and mountainous terrain as provided by embodiments of the present invention.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.

Claims (9)

1. A method for computer simulation of radio wave communications in a mountainous terrain, the method comprising the steps of:
s1, loading a three-dimensional digital map;
s2, setting the positions of a communication transmitter and a receiver on the three-dimensional digital map;
s3, setting the working frequency of the communication equipment used by the communication transmitter and the receiver; wherein the communication transmitter uses the same operating frequency of the communication device as the receiver;
s4, forming a terrain elevation profile between the communication transmitter and the receiver on the three-dimensional digital map;
s5, judging the mountain and mountain terrain according to the three-dimensional digital map and the terrain elevation profile;
s6, calculating a terrain attenuation correction factor Lambda;
s7, calculating the free space transmission loss of radio waves;
s8, calculating the radio wave transmission loss according to the terrain attenuation correction factor Lambda and the free space transmission loss;
s9, performing analog communication using the radio wave transmission loss as an attenuation value of the radio wave communication;
wherein, the step S6 specifically includes the following steps:
s61: calculating the minimum Fresnel radius F0；
Figure FDA0002221174370000011
S62: calculating a terrain parameter mu;
Figure FDA0002221174370000012
wherein k is d1/d；α＝Δy/F0；L＝r/d；
Where k is the distance coefficient, d1The length of the vertical distance from the transmitter to the mountains and the ground; d is the distance from the transmitter to the receiver; alpha is a relative height coefficient; Δ y is the height of the vertical distance of the mountains from the ground; f0Is the minimum fresnel radius; λ is the radio wave wavelength; l is a mountain depth coefficient; r is the depth of mountains;
s63: calculating relative clearance
Figure FDA0002221174370000013
Wherein Hc is the radio wave clearance; f0Is the minimum fresnel radius;
s64; establishing a terrain parameter-relative clearance relation;
s65: and calculating a terrain attenuation correction factor Lambda according to the established terrain parameter-relative clearance relation.
2. The method of claim 1, wherein the terrain elevation profile is generated by computer recognition of the three-dimensional digital map or by manual information entry from the three-dimensional digital map.
3. The method of claim 1, wherein the terrain elevation profile and the three-dimensional digital map comprise terrain information, altitude information, distance information, obstacle information.
4. The method of claim 1, wherein the terrain parameter μ comprises μ ═ 1; μ ═ 0 and μ ∞.
5. The method according to claim 1, wherein the step S7 calculates the radio wave free space transmission loss Lbf，Lbf＝32.45+20lgf(MHz)+20lgd(km)(db)，
Wherein L isbfFor the radio wave free space transmission loss, d is the distance from the transmitter to the receiver, and f is the operating frequency of the communication device.
6. The method according to claim 1, wherein the step S8 calculates the radio wave transmission loss Lb，Lb＝Lbf+Λ；
Wherein the radio wave transmission loss Lb(ii) a Radio wave free space transmission loss Lb(ii) a A terrain attenuation correction factor Λ.
7. An apparatus for computer simulation of radio wave communications over mountainous terrain, the apparatus comprising:
the loading module is used for loading the three-dimensional digital map;
the setting module is used for setting the positions of a communication transmitter and a receiver on the three-dimensional digital map and setting the working frequency of communication equipment used by the communication transmitter and the receiver;
a terrain elevation profile module for forming a terrain elevation profile between the communication transmitter and the receiver on the three-dimensional digital map;
the terrain judging module is used for judging the mountains and mountains terrain according to the three-dimensional digital map and the terrain elevation sectional view;
the correction factor calculation module is used for calculating a terrain attenuation correction factor lambda;
the free space transmission loss calculation module is used for calculating the free space transmission loss of radio waves;
the radio wave transmission loss calculating module is used for calculating the radio wave transmission loss;
an analog communication module for performing analog communication using the radio wave transmission loss as an attenuation value of the radio wave communication;
wherein; the correction factor calculation module further comprises:
the calculating unit is used for calculating a first Fresnel radius, a terrain parameter and a relative clearance of radio waves;
and the terrain parameter-relative clearance relation unit is used for establishing a terrain parameter-relative clearance relation and calculating a terrain attenuation correction factor lambda.
8. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1-6.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1-6 when executing the program.
CN201910934505.8A 2019-09-29 2019-09-29 Method for performing radio wave communication in mountains and mountains by computer simulation Pending CN110661582A (en)

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