CN110545145A - Method for performing radio wave communication in bimodal terrain through computer simulation - Google Patents
Method for performing radio wave communication in bimodal terrain through computer simulation Download PDFInfo
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Abstract
the invention discloses a method for carrying out radio wave communication in bimodal 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 a double-peak terrain according to the three-dimensional digital map and the terrain elevation profile; s6, calculating a terrain attenuation correction factor A (U); s7, calculating the free space transmission loss of radio waves; s8, calculating radio wave transmission loss according to the terrain attenuation correction factor A (U) 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
Technical Field
The invention relates to a communication test method of a command system, in particular to a method for simulating radio wave communication in bimodal terrain 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 problems, a method for simulating radio wave communication in a bimodal terrain by a computer is needed.
disclosure of Invention
the invention aims to provide a method for simulating radio wave communication in a bimodal terrain by a computer, which aims to solve the problems that the communication test of a command system in the prior art cannot ensure the life safety of communication personnel, the virtual simulation cannot be carried out on site, 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 bimodal terrain.
in order to achieve the purpose, the invention adopts the following technical scheme:
a method for computer simulation of radio wave communication in bimodal 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 working frequency of the communication equipment used by the communication transmitter is the same as that of the communication equipment used by the receiver;
s4, forming a terrain elevation profile between the communication transmitter and the receiver on the three-dimensional digital map;
s5, judging a double-peak terrain according to the three-dimensional digital map and the terrain elevation profile;
S6, calculating a terrain attenuation correction factor A (U);
s7, calculating the free space transmission loss of radio waves;
s8, calculating radio wave transmission loss according to the terrain attenuation correction factor A (U) 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: constructing an equivalent third peak according to the three-dimensional digital map and the terrain elevation profile;
s62: calculating a first fresnel radius F1: diameter F1:
where d2 is the distance from the transmitter to the equivalent third peak; d2 is the distance from the receiver to the equivalent third peak; d is the distance from the transmitter to the receiver; λ is the radio wave wavelength;
S63: calculating the radio wave clearance Hc:
Wherein h1 is the transmitter antenna height; h2 is the receiver antenna height; h1 transmitter location terrain elevation; h2 receiver position terrain height; h is the terrain height; r0 is the earth radius; d1 is the distance from the transmitter to the equivalent third peak; d2 is the distance from the receiver to the equivalent third peak; d is the distance from the transmitter to the receiver;
the radio wave clearance Hc is a vertical distance between a connecting line of the highest points of the transmitter antenna and the receiver antenna and the highest point of the equivalent third peak;
s64: calculating a diffraction parameter U: U-Hc/F1
S65: calculating a terrain attenuation correction factor A (U):
A(U)＝6+12.2U －0.5≤U≤0.65；
A(U)＝11+6.1U+10logU 0.65<U≤0.9；
A(U)＝16+20logU 0.9<U≤80。
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, on the three-dimensional digital map, the two peaks of highest altitude located between the communication transmitter and the receiver are identified to form a bimodal terrain.
Preferably, the step S7 specifically includes the following steps:
S71: calculating the free space transmission loss Lbf, Lbf ═ 32.45+20lgf (MHz) +20lgd (km) ((db));
where, Lbf is the radio wave free space transmission loss, d is the distance from the transmitter to the receiver, and f is the communication device operating frequency.
preferably, the step S8 calculates a radio wave transmission loss Lbf, Lb ═ Lbf + a (u); (ii) a
wherein the radio wave transmission loss Lb; radio wave free space transmission loss Lbf; terrain attenuation correction factor A (U).
in order to achieve the second purpose, the invention adopts the following technical scheme:
an apparatus for computer simulation of radio wave communication in bimodal 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 double-peak terrain according to the three-dimensional digital map and the terrain elevation profile map;
A correction factor calculation module for calculating a terrain attenuation correction factor A (U);
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 equivalent third peak construction unit is used for constructing an equivalent third peak according to the three-dimensional digital map and the terrain elevation profile;
and the calculation unit is used for calculating the first Fresnel radius, the radio wave propagation clearance, the diffraction parameter and the terrain attenuation correction factor.
preferably, a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method of any one of the first objects.
Preferably, a computer device comprises 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 one of the first objects when executing the program.
The invention has the following beneficial effects:
The invention adopts the method of simulating radio wave communication in the bimodal terrain by the computer, replaces the special test carried by communication professionals with communication equipment at the appointed communication test site, 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.
Drawings
the following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 shows a radio wave propagation clearance diagram;
fig. 2 shows a schematic diagram of an equivalent third peak:
FIG. 3 shows a schematic structural diagram of a computer device;
reference numerals: d1 is the distance from the transmitter to the equivalent third peak; d2 is the distance from the receiver to the equivalent third peak; d is the distance from the transmitter to the receiver; λ radio wave wavelength; f1 first fresnel radius; hc radio wave clearance; h1 is the transmitter antenna height; h2 is the receiver antenna height; h1 transmitter location terrain elevation; h2 receiver position terrain height; h is the terrain height; r0 is the earth radius; u diffraction parameters; a (U) a terrain attenuation correction factor; lbf is free space transmission loss; f is the working frequency of the communication equipment; lb radio wave transmission loss; a T transmitter; an R receiver; a first peak M1; a second peak M2; m3 equivalent third peak; 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 communication in bimodal terrain comprises the following steps:
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.
And S2, positions of the communication transmitter and the receiver are communicated on the three-dimensional digital map, and a user adds a communication transmitter and receiver model through a mouse or directly selects points to define the communication transmitter and the receiver, so that the communication person is simulated to arrive at the position of the communication person in the field for 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 the same working frequency of the communication equipment as that of the communication equipment of the receiver;
The user sets the operating frequency of the communication device used at the communication transmitter and receiver, simulating a communication person using the communication device in the field to adjust the operating frequency of the communication device.
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.
and S5, judging the double-peak terrain according to the three-dimensional digital map and the terrain elevation profile. Since a plurality of peaks may occur between the transmitter and the receiver on the three-dimensional digital map, the setting computer recognizes that two peaks having the highest height between the communication transmitter and the receiver form a bimodal terrain.
s6, calculating a terrain attenuation correction factor A (U);
step S6 specifically includes the following steps:
S61: constructing an equivalent third peak according to the three-dimensional digital map and the terrain elevation profile; as shown in fig. 1, a line segment formed by a connection line of the highest point of the transmitter T and the first peak M1 and a line segment formed by a connection line of the highest point of the receiver R and the second peak M2 intersect at M3, M3 is an equivalent third peak of a two-peak terrain, and a vertical line is drawn from M3 to a horizontal line segment to obtain a height Hc equivalent to the third peak M3. The equivalent third peak schematic diagram comprises position information of a transmitter and a receiver, double peak terrain information and equivalent third peak terrain information.
s62: calculating a first fresnel radius F1:
where d1 is the distance from the transmitter to the equivalent third peak; d2 is the distance from the receiver to the equivalent third peak; d is the distance from the transmitter to the receiver; λ is the radio wave wavelength;
S63: calculating the radio wave clearance Hc:
wherein h1 is the transmitter antenna height; h2 is the receiver antenna height; h1 transmitter location terrain elevation; h2 receiver position terrain height; h is the terrain height; r0 is the earth radius; d1 is the distance from the transmitter to the equivalent third peak; d2 is the distance from the receiver to the equivalent third peak; d is the distance from the transmitter to the receiver;
the radio wave clearance Hc is a vertical distance between a connecting line of the highest points of the transmitter antenna and the receiver antenna and the highest point of the equivalent third peak;
As shown in fig. 2; setting a transmitter antenna height H1 and a terrain height H1 at a transmitter T, setting a receiver antenna height H2 and a terrain height H2 at a receiver R, taking a point M at a continuous peak, wherein a radio wave clearance Hc is a vertical distance between a 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;
S64: calculating a diffraction parameter U: U-Hc/F1;
s65: calculating a terrain attenuation correction factor A (U):
A(U)＝6+12.2U －0.5≤U≤0.65；
A(U)＝11+6.1U+10logU 0.65<U≤0.9；
A(U)＝16+20logU 0.9<U≤80。
s7, calculating the free space transmission loss of radio waves;
The formula is Lbf, Lbf equals 32.45+20lgf (MHz) +20lgd (km) (db);
where, Lbf is the radio wave free space transmission loss, d is the distance from the transmitter to the receiver, and f is the communication device operating frequency.
S8, calculating the radio wave transmission loss Lb;
The calculation formula is that Lb ═ Lbf + a (u);
wherein, among them, the radio wave transmission loss Lb; radio wave free space transmission loss Lbf; terrain attenuation correction factor A (U).
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, analog communication is performed with the radio wave transmission loss obtained after the above steps S1-S8 performed as the attenuation value of the radio wave communication.
the method for performing radio wave communication in the bimodal terrain 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 a bimodal terrain by a computer, replaces an experiment mode that communication professionals carry communication equipment to carry out special tests at specified communication test places, and effectively guarantees life safety of the communication professionals. 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 simulating radio wave communication in bimodal terrain by a computer, which comprises:
and 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 downloaded from the network and containing the specific information.
and 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 the communication equipment used by the communication transmitter and the receiver. The simulation communication personnel arrive at the position of the field investigation communication test.
And the terrain elevation profile module is used for 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.
The terrain judging module is used for judging the double-peak terrain according to the three-dimensional digital map and the terrain elevation profile map; since a plurality of peaks may occur between the transmitter and the receiver on the three-dimensional digital map, the setting computer recognizes that two peaks having the highest height between the communication transmitter and the receiver form a bimodal terrain.
A correction factor calculation module for calculating a terrain attenuation correction factor A (U);
The free space transmission loss calculation module is used for calculating the free space transmission loss of radio waves;
The radio wave transmission loss calculation module is used for calculating the radio wave transmission loss according to the terrain attenuation correction factor and the free space 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 equivalent third peak construction unit is used for constructing an equivalent third peak according to the three-dimensional digital map and the terrain elevation profile;
and the calculation unit is used for calculating the first Fresnel radius, the radio wave propagation clearance, the diffraction parameter and the terrain attenuation correction factor.
wherein the first fresnel radius F1: the calculation formula is as follows:
where d1 is the distance from the transmitter to the equivalent third peak; d2 is the distance from the receiver to the equivalent third peak; d is the distance from the transmitter to the receiver; λ is the radio wave wavelength;
The calculation formula of the radio wave clearance Hc is as follows:
Wherein h1 is the transmitter antenna height; h2 is the receiver antenna height; h1 transmitter location terrain elevation; h2 receiver position terrain height; h is the terrain height; r0 is the earth radius; d1 is the distance from the transmitter to the equivalent third peak; d2 is the distance from the receiver to the equivalent third peak; d is the distance from the transmitter to the receiver;
The radio wave clearance Hc is a vertical distance between a connecting line of the highest points of the transmitter antenna and the receiver antenna and the highest point of the equivalent third peak;
the diffraction parameter U is calculated by the formula: U-Hc/F1;
The terrain attenuation correction factor A (U) is calculated by the formula:
A(U)＝6+12.2U －0.5≤U≤0.65；
A(U)＝11+6.1U+10logU 0.65<U≤0.9；
A(U)＝16+20logU 0.9<U≤80。
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 double-peak terrain according to the three-dimensional digital map and the terrain elevation profile; s6, calculating a terrain attenuation correction factor A (U); s7, calculating the free space transmission loss of radio waves; s8, calculating the radio wave transmission loss according to the terrain attenuation correction factor A (U) 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 communication in bimodal 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 communication in bimodal 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 working frequency of the communication equipment used by the communication transmitter is the same as that of the communication equipment used by the receiver;
s4, forming a terrain elevation profile between the communication transmitter and the receiver on the three-dimensional digital map;
s5, judging a double-peak terrain according to the three-dimensional digital map and the terrain elevation profile;
s6, calculating a terrain attenuation correction factor A (U);
s7, calculating the free space transmission loss of radio waves;
s8, calculating radio wave transmission loss according to the terrain attenuation correction factor A (U) 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: constructing an equivalent third peak according to the three-dimensional digital map and the terrain elevation profile;
S62: calculating a first fresnel radius F1:
Where d1 is the distance from the transmitter to the equivalent third peak; d2 is the distance from the receiver to the equivalent third peak; d is the distance from the transmitter to the receiver; λ is the radio wave wavelength;
s63: calculating the radio wave clearance Hc:
wherein h1 is the transmitter antenna height; h2 is the receiver antenna height; h1 transmitter location terrain elevation; h2 receiver position terrain height; h is the terrain height; r0 is the earth radius; d1 is the distance from the transmitter to the equivalent third peak; d2 is the distance from the receiver to the equivalent third peak; d is the distance from the transmitter to the receiver;
the radio wave clearance Hc is a vertical distance between a connecting line of the highest points of the transmitter antenna and the receiver antenna and the highest point of the equivalent third peak;
s64: calculating a diffraction parameter U: U-Hc/F1;
s65: calculating a terrain attenuation correction factor A (U):
A(U)＝6+12.2U －0.5≤U≤0.65；
A(U)＝11+6.1U+10logU 0.65<U≤0.9；
A(U)＝16+20logU 0.9<U≤80。
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 identifying the two peaks on the three-dimensional digital map that are at the highest elevation between the communication transmitter and receiver form a bimodal terrain.
5. the method according to claim 1, wherein the step S7 specifically comprises the steps of:
S71: calculating the free space transmission loss Lbf, Lbf ═ 32.45+20lgf (MHz) +20lgd (km) ((db));
where, Lbf is the radio wave free space transmission loss, d is the distance from the transmitter to the receiver, and f is the communication device operating frequency.
6. the method according to claim 1, wherein the step S8 calculates a radio wave transmission loss Lb, Lb-Lbf + a (u);
wherein, the radio wave transmission loss Lb; radio wave free space transmission loss Lbf; terrain attenuation correction factor A (U).
7. an apparatus for computer simulation of radio wave communication in bimodal terrain, 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 double-peak terrain according to the three-dimensional digital map and the terrain elevation profile map;
A correction factor calculation module for calculating a terrain attenuation correction factor A (U);
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 equivalent third peak construction unit is used for constructing an equivalent third peak according to the three-dimensional digital map and the terrain elevation profile;
And the calculation unit is used for calculating the first Fresnel radius, the radio wave propagation clearance, the diffraction parameter and the terrain attenuation correction factor.
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.
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