CN116842300B - Low-altitude electromagnetic wave scattering loss estimation method and system based on sea clutter - Google Patents
Low-altitude electromagnetic wave scattering loss estimation method and system based on sea clutter Download PDFInfo
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Abstract
The invention discloses a low-altitude electromagnetic wave scattering loss estimation method based on sea clutter, which comprises the following steps: acquiring the effective height of waves and the frequency of low-altitude electromagnetic waves, setting the influence coefficient of the environment on the waves and the influence coefficient of the environment on the frequency, and calculating the parameters of sea surface roughness and scattering coefficients; acquiring an incident angle of low-altitude electromagnetic waves relative to sea waves, and calculating an effective scattering cross-sectional area and a geometric scattering coefficient by combining parameters of sea surface roughness, parameters of the scattering coefficient and the effective height of the waves; and setting a scattering loss estimation model, and inputting the effective scattering cross section area and the geometric scattering coefficient into the scattering loss estimation model as parameters to complete low-altitude electromagnetic wave scattering loss estimation.
Description
Technical Field
The invention belongs to the technical field of low-altitude electromagnetic wave scattering loss estimation, and particularly relates to a low-altitude electromagnetic wave scattering loss estimation method and system based on sea clutter.
Background
Sea clutter generally refers to the back-scattered echoes of the sea surface under radar illumination. Sea clutter is the most complex form of radar clutter.
Sea clutter has a number of effects on low-altitude electromagnetic wave propagation, including mainly scattering losses, absorption losses, multipath propagation and blocking effects. These effects are caused by sea surface waves, sea water conductivity, sea water temperature, sea surface roughness, etc.
Scattering loss: sea clutter can cause scattering of electromagnetic waves on the sea surface, resulting in scattering losses. Scattering can scatter a portion of the electromagnetic energy in all directions, resulting in signal attenuation and energy loss.
Absorption loss: seawater has certain electromagnetic wave absorption performance, especially at higher frequencies. The salt and dissolved substances in the seawater can absorb electromagnetic waves, so that the energy of the electromagnetic waves is gradually weakened.
Multipath propagation: wave motion caused by sea clutter can cause electromagnetic waves to be reflected, refracted and scattered for multiple times in the propagation process, so that multipath propagation effect is formed. This can result in multiple arrival paths of the electromagnetic wave at the receiving end, resulting in doppler spread and delay spread of the signal.
Occlusion effect: sea surface waves and marine obstructions, such as islands, ships, etc., may cause blockage of the propagation path of the low-altitude electromagnetic waves. This blocking effect can cause attenuation of electromagnetic waves and loss of signals, especially in the presence of large obstructions or complex ocean terrain.
The invention aims to solve the problem that scattering loss is not easy to calculate.
Disclosure of Invention
In order to solve the technical problems, the invention provides a low-altitude electromagnetic wave scattering loss estimation method based on sea clutter, which comprises the following steps:
acquiring the effective height of waves and the frequency of low-altitude electromagnetic waves, setting the influence coefficient of the environment on the waves and the influence coefficient of the environment on the frequency, and calculating the parameters of sea surface roughness and scattering coefficients;
acquiring an incident angle of low-altitude electromagnetic waves relative to sea waves, and calculating an effective scattering cross-sectional area and a geometric scattering coefficient by combining parameters of sea surface roughness, parameters of the scattering coefficient and the effective height of the waves;
and setting a scattering loss estimation model, and inputting the effective scattering cross section area and the geometric scattering coefficient into the scattering loss estimation model as parameters to complete low-altitude electromagnetic wave scattering loss estimation.
Further, the scattering loss estimation model includes:
L＝10*log 10(σ*G 2 )
where L is scattering loss, σ is effective scattering cross-sectional area, and G is geometric scattering coefficient.
Further, the calculating the effective scattering cross-sectional area and the geometric scattering coefficient includes:
σ＝(π*H 2 )*P
G＝10 (0.1*γ*cosθ)
wherein H is the effective height of the wave, P is the parameter of sea surface roughness, gamma is the parameter of scattering coefficient, and theta is the incident angle of the low-altitude electromagnetic wave relative to the sea wave.
Further, the parameter for calculating the sea surface roughness and the parameter for calculating the scattering coefficient include:
P＝10*log 10(α*H 2 )
γ＝10*log 10(B*f 2 )
wherein alpha is the influence coefficient of the environment on the sea wave, B is the influence coefficient of the environment on the frequency, and f is the low-altitude electromagnetic frequency.
Further, the method further comprises the following steps:
and adjusting the influence coefficient of the environment on sea waves and the influence coefficient of the environment on frequency according to the current sea level environment.
The invention also provides a low-altitude electromagnetic wave scattering loss estimation system based on sea clutter, which comprises:
the parameter module of the sea surface roughness and the parameter of the scattering coefficient is used for obtaining the effective height of waves and the frequency of low-altitude electromagnetic waves, setting the influence coefficient of the environment on the waves and the influence coefficient of the environment on the frequency, and calculating the parameter of the sea surface roughness and the parameter of the scattering coefficient;
the module is used for acquiring the incident angle of the low-altitude electromagnetic wave relative to sea waves, and calculating the effective scattering cross-sectional area and the geometric scattering coefficient by combining the parameter of the sea surface roughness, the parameter of the scattering coefficient and the effective height of the waves;
and the estimation module is used for setting a scattering loss estimation model, and inputting the effective scattering cross section area and the geometric scattering coefficient into the scattering loss estimation model as parameters so as to finish low-altitude electromagnetic wave scattering loss estimation.
Further, the scattering loss estimation model includes:
L＝10*log 10(σ*G 2 )
where L is scattering loss, σ is effective scattering cross-sectional area, and G is geometric scattering coefficient.
Further, the calculating the effective scattering cross-sectional area and the geometric scattering coefficient includes:
σ＝(π*H 2 )*P
G＝10 (0.1*γ*cosθ)
wherein H is the effective height of the wave, P is the parameter of sea surface roughness, gamma is the parameter of scattering coefficient, and theta is the incident angle of the low-altitude electromagnetic wave relative to the sea wave.
Further, the parameter for calculating the sea surface roughness and the parameter for calculating the scattering coefficient include:
P＝10*log 10(α*H 2 )
γ＝10*log 10(B*f 2 )
wherein alpha is the influence coefficient of the environment on the sea wave, B is the influence coefficient of the environment on the frequency, and f is the low-altitude electromagnetic frequency.
Further, the method further comprises the following steps:
and adjusting the influence coefficient of the environment on sea waves and the influence coefficient of the environment on frequency according to the current sea level environment.
In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:
according to the method, the effective height of waves and the frequency of low-altitude electromagnetic waves are obtained, the influence coefficient of the environment on the waves and the influence coefficient of the environment on the frequency are set, and the parameters of sea surface roughness and scattering coefficients are calculated; acquiring an incident angle of low-altitude electromagnetic waves relative to sea waves, and calculating an effective scattering cross-sectional area and a geometric scattering coefficient by combining parameters of sea surface roughness, parameters of the scattering coefficient and the effective height of the waves; and setting a scattering loss estimation model, and inputting the effective scattering cross section area and the geometric scattering coefficient into the scattering loss estimation model as parameters to complete low-altitude electromagnetic wave scattering loss estimation. Through the technical scheme, the low-altitude electromagnetic wave scattering loss estimation can be completed according to a series of parameters.
Drawings
FIG. 1 is a flow chart of the method of embodiment 1 of the present invention;
fig. 2 is a block diagram of a system of embodiment 2 of the present invention.
Detailed Description
In order to better understand the above technical solutions, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The method provided by the invention can be implemented in a terminal environment, wherein the terminal can comprise one or more of the following components: processor, storage medium, and display screen. Wherein the storage medium has stored therein at least one instruction that is loaded and executed by the processor to implement the method described in the embodiments below.
The processor may include one or more processing cores. The processor connects various parts within the overall terminal using various interfaces and lines, performs various functions of the terminal and processes data by executing or executing instructions, programs, code sets, or instruction sets stored in the storage medium, and invoking data stored in the storage medium.
The storage medium may include a random access Memory (Random Access Memory, RAM) or a Read-Only Memory (ROM). The storage medium may be used to store instructions, programs, code sets, or instructions.
The display screen is used for displaying a user interface of each application program.
All subscripts in the formula of the invention are only used for distinguishing parameters and have no practical meaning.
In addition, it will be appreciated by those skilled in the art that the structure of the terminal described above is not limiting and that the terminal may include more or fewer components, or may combine certain components, or a different arrangement of components. For example, the terminal further includes components such as a radio frequency circuit, an input unit, a sensor, an audio circuit, a power supply, and the like, which are not described herein.
Example 1
As shown in fig. 1, an embodiment of the present invention provides a low-altitude electromagnetic wave scattering loss estimation method based on sea clutter, including:
step 101, obtaining the effective height of waves and the frequency of low-altitude electromagnetic waves, setting the influence coefficient of the environment on the waves and the influence coefficient of the environment on the frequency, and calculating the parameters of sea surface roughness and scattering coefficients;
specifically, the parameter for calculating the sea surface roughness and the parameter for calculating the scattering coefficient include:
P＝10*log 10(α*H 2 )
Y＝10*log 10(B*f 2 )
wherein alpha is the influence coefficient of the environment on the sea wave, B is the influence coefficient of the environment on the frequency, and f is the low-altitude electromagnetic frequency.
Specifically, the method further comprises the following steps:
and adjusting the influence coefficient of the environment on sea waves and the influence coefficient of the environment on frequency according to the current sea level environment.
102, acquiring an incident angle of low-altitude electromagnetic waves relative to sea waves, and calculating an effective scattering cross-sectional area and a geometric scattering coefficient by combining parameters of sea surface roughness, parameters of scattering coefficients and effective heights of waves;
specifically, the calculating the effective scattering cross-sectional area and the geometric scattering coefficient includes:
σ＝(π*H 2 )*P
G＝10 (0.1*γ*cosθ)
wherein H is the effective height of the wave, P is the parameter of sea surface roughness, gamma is the parameter of scattering coefficient, and theta is the incident angle of the low-altitude electromagnetic wave relative to the sea wave.
And step 103, setting a scattering loss estimation model, and inputting the effective scattering cross section area and the geometric scattering coefficient into the scattering loss estimation model as parameters to finish low-altitude electromagnetic wave scattering loss estimation.
Specifically, the scattering loss estimation model includes:
L＝10*log 10(σ*G 2 )
where L is scattering loss, σ is effective scattering cross-sectional area, and G is geometric scattering coefficient.
Example 2
As shown in fig. 2, the embodiment of the present invention further provides a low-altitude electromagnetic wave scattering loss estimation system based on sea clutter, which includes:
the parameter module of the sea surface roughness and the parameter of the scattering coefficient is used for obtaining the effective height of waves and the frequency of low-altitude electromagnetic waves, setting the influence coefficient of the environment on the waves and the influence coefficient of the environment on the frequency, and calculating the parameter of the sea surface roughness and the parameter of the scattering coefficient;
specifically, the parameter for calculating the sea surface roughness and the parameter for calculating the scattering coefficient include:
P＝10*log 10(α*H 2 )
γ＝10*log 10(B*f 2 )
wherein alpha is the influence coefficient of the environment on the sea wave, B is the influence coefficient of the environment on the frequency, and f is the low-altitude electromagnetic frequency.
Specifically, the method further comprises the following steps:
and adjusting the influence coefficient of the environment on sea waves and the influence coefficient of the environment on frequency according to the current sea level environment.
The module is used for acquiring the incident angle of the low-altitude electromagnetic wave relative to sea waves, and calculating the effective scattering cross-sectional area and the geometric scattering coefficient by combining the parameter of the sea surface roughness, the parameter of the scattering coefficient and the effective height of the waves;
specifically, the calculating the effective scattering cross-sectional area and the geometric scattering coefficient includes:
σ＝(π*H 2 )*P
G＝10 (0.1*γ*cosθ)
wherein H is the effective height of the wave, P is the parameter of sea surface roughness, gamma is the parameter of scattering coefficient, and theta is the incident angle of the low-altitude electromagnetic wave relative to the sea wave.
And the estimation module is used for setting a scattering loss estimation model, and inputting the effective scattering cross section area and the geometric scattering coefficient into the scattering loss estimation model as parameters so as to finish low-altitude electromagnetic wave scattering loss estimation.
Specifically, the scattering loss estimation model includes:
L＝10*log 10(σ*G 2 )
where L is scattering loss, σ is effective scattering cross-sectional area, and G is geometric scattering coefficient.
Example 3
The embodiment of the invention also provides a storage medium which stores a plurality of instructions for realizing the low-altitude electromagnetic wave scattering loss estimation method based on the sea clutter.
Alternatively, in this embodiment, the storage medium may be located in any one of the computer terminals in the computer terminal group in the computer network, or in any one of the mobile terminals in the mobile terminal group.
Alternatively, in the present embodiment, the storage medium is configured to store program code for performing the steps of: step 101, obtaining the effective height of waves and the frequency of low-altitude electromagnetic waves, setting the influence coefficient of the environment on the waves and the influence coefficient of the environment on the frequency, and calculating the parameters of sea surface roughness and scattering coefficients;
specifically, the parameter for calculating the sea surface roughness and the parameter for calculating the scattering coefficient include:
P＝10*log 10(α*H 2 )
Y＝10*log 10(B*f 2 )
wherein alpha is the influence coefficient of the environment on the sea wave, B is the influence coefficient of the environment on the frequency, and f is the low-altitude electromagnetic frequency.
Specifically, the method further comprises the following steps:
and adjusting the influence coefficient of the environment on sea waves and the influence coefficient of the environment on frequency according to the current sea level environment.
102, acquiring an incident angle of low-altitude electromagnetic waves relative to sea waves, and calculating an effective scattering cross-sectional area and a geometric scattering coefficient by combining parameters of sea surface roughness, parameters of scattering coefficients and effective heights of waves;
specifically, the calculating the effective scattering cross-sectional area and the geometric scattering coefficient includes:
σ＝(π*H 2 )*P
G＝10 (0.1*γ*cosθ)
wherein H is the effective height of the wave, P is the parameter of sea surface roughness, gamma is the parameter of scattering coefficient, and theta is the incident angle of the low-altitude electromagnetic wave relative to the sea wave.
And step 103, setting a scattering loss estimation model, and inputting the effective scattering cross section area and the geometric scattering coefficient into the scattering loss estimation model as parameters to finish low-altitude electromagnetic wave scattering loss estimation.
Specifically, the scattering loss estimation model includes:
L＝10*log 10(σ*G 2 )
where L is scattering loss, σ is effective scattering cross-sectional area, and G is geometric scattering coefficient.
Example 4
The embodiment of the invention also provides electronic equipment, which comprises a processor and a storage medium connected with the processor, wherein the storage medium stores a plurality of instructions, and the instructions can be loaded and executed by the processor so that the processor can execute the low-altitude electromagnetic wave scattering loss estimation method based on sea clutter.
Specifically, the electronic device of the present embodiment may be a computer terminal, and the computer terminal may include: one or more processors, and a storage medium.
The storage medium may be used to store a software program and a module, for example, a low-altitude electromagnetic wave scattering loss estimation method based on sea clutter in the embodiment of the present invention, and the processor executes various functional applications and data processing by running the software program and the module stored in the storage medium, that is, implements the low-altitude electromagnetic wave scattering loss estimation method based on sea clutter. The storage medium may include a high-speed random access storage medium, and may also include a non-volatile storage medium, such as one or more magnetic storage systems, flash memory, or other non-volatile solid-state storage medium. In some examples, the storage medium may further include a storage medium remotely located with respect to the processor, and the remote storage medium may be connected to the terminal through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The processor may invoke the information stored in the storage medium and the application program via the transmission system to perform the following steps: step 101, obtaining the effective height of waves and the frequency of low-altitude electromagnetic waves, setting the influence coefficient of the environment on the waves and the influence coefficient of the environment on the frequency, and calculating the parameters of sea surface roughness and scattering coefficients;
specifically, the parameter for calculating the sea surface roughness and the parameter for calculating the scattering coefficient include:
P＝10*log 10(α*H 2 )
γ＝10*log 10(B*f 2 )
wherein alpha is the influence coefficient of the environment on the sea wave, B is the influence coefficient of the environment on the frequency, and f is the low-altitude electromagnetic frequency.
Specifically, the method further comprises the following steps:
and adjusting the influence coefficient of the environment on sea waves and the influence coefficient of the environment on frequency according to the current sea level environment.
102, acquiring an incident angle of low-altitude electromagnetic waves relative to sea waves, and calculating an effective scattering cross-sectional area and a geometric scattering coefficient by combining parameters of sea surface roughness, parameters of scattering coefficients and effective heights of waves;
specifically, the calculating the effective scattering cross-sectional area and the geometric scattering coefficient includes:
σ＝(π*H 2 )*P
G＝10 (0.1*γ*cosθ)
wherein H is the effective height of the wave, P is the parameter of sea surface roughness, gamma is the parameter of scattering coefficient, and theta is the incident angle of the low-altitude electromagnetic wave relative to the sea wave.
And step 103, setting a scattering loss estimation model, and inputting the effective scattering cross section area and the geometric scattering coefficient into the scattering loss estimation model as parameters to finish low-altitude electromagnetic wave scattering loss estimation.
Specifically, the scattering loss estimation model includes:
L＝10*log 10(σ*G 2 )
where L is scattering loss, σ is effective scattering cross-sectional area, and G is geometric scattering coefficient.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the embodiments provided in the present invention, it should be understood that the disclosed technology may be implemented in other manners. The system embodiments described above are merely exemplary, and for example, the division of the units is merely a logic function division, and there may be another division manner in actual implementation, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or partly in the form of a software product or all or part of the technical solution, which is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random-access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or the like, which can store program codes.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (4)
1. The low-altitude electromagnetic wave scattering loss estimation method based on the sea clutter is characterized by comprising the following steps of:
acquiring the effective height and low-altitude electromagnetic wave frequency of waves, setting the influence coefficient of the environment on the waves and the influence coefficient of the environment on the frequency, and calculating the parameters of sea surface roughness and scattering coefficient, wherein the parameters of calculating the sea surface roughness and the parameters of the scattering coefficient comprise:
P＝100*log10(α*H 2 )
γ＝10*log10(B*f 2 )
wherein alpha is the influence coefficient of the environment on sea waves, B is the influence coefficient of the environment on frequency, and f is the low-altitude electromagnetic frequency;
acquiring an incident angle of the low-altitude electromagnetic wave relative to sea waves, and calculating an effective scattering cross-sectional area and a geometric scattering coefficient by combining the parameter of the sea surface roughness, the parameter of the scattering coefficient and the effective height of the waves, wherein the calculating the effective scattering cross-sectional area and the geometric scattering coefficient comprises:
σ＝(π*H 2 )*P
G＝10 (0.1*γ*cosθ)
wherein H is the effective height of the wave, P is the parameter of sea surface roughness, gamma is the parameter of scattering coefficient, and theta is the incident angle of the low-altitude electromagnetic wave relative to the wave;
setting a scattering loss estimation model, and inputting the effective scattering cross section area and the geometric scattering coefficient into the scattering loss estimation model as parameters to finish low-altitude electromagnetic wave scattering loss estimation, wherein the scattering loss estimation model comprises:
L＝10*log10(σ*G 2 )
where L is scattering loss, σ is effective scattering cross-sectional area, and G is geometric scattering coefficient.
2. The low-altitude electromagnetic wave scattering loss estimation method based on sea clutter of claim 1, further comprising:
and adjusting the influence coefficient of the environment on sea waves and the influence coefficient of the environment on frequency according to the current sea level environment.
3. A low-altitude electromagnetic wave scattering loss estimation system based on sea clutter, comprising:
the parameter module is used for acquiring the effective height of waves and the frequency of low-altitude electromagnetic waves, setting the influence coefficient of the environment on the waves and the influence coefficient of the environment on the frequency, and calculating the parameters of the sea surface roughness and the parameters of the scattering coefficient, wherein the parameters for calculating the sea surface roughness and the parameters of the scattering coefficient comprise:
P＝10*log10(α*H 2 )
γ＝10*log10(B*f 2 )
wherein alpha is the influence coefficient of the environment on sea waves, B is the influence coefficient of the environment on frequency, and f is the low-altitude electromagnetic frequency;
the module is used for acquiring the incident angle of the low-altitude electromagnetic wave relative to the sea wave, combining the parameter of the sea surface roughness, the parameter of the scattering coefficient and the effective height of the wave, and calculating the effective scattering cross-sectional area and the geometric scattering coefficient, wherein the calculating the effective scattering cross-sectional area and the geometric scattering coefficient comprises:
σ＝(π*H 2 )*P
G＝10 (0.1*γ*cosθ)
wherein H is the effective height of the wave, P is the parameter of sea surface roughness, gamma is the parameter of scattering coefficient, and theta is the incident angle of the low-altitude electromagnetic wave relative to the wave;
an estimation module, configured to set a scattering loss estimation model, and input the effective scattering cross-sectional area and the geometric scattering coefficient as parameters into the scattering loss estimation model to complete low-altitude electromagnetic wave scattering loss estimation, where the scattering loss estimation model includes:
L＝10*log10(σ*G 2 )
where L is scattering loss, σ is effective scattering cross-sectional area, and G is geometric scattering coefficient.
4. A low-altitude electromagnetic wave scattering loss estimation system based on sea clutter as claimed in claim 3, further comprising:
and adjusting the influence coefficient of the environment on sea waves and the influence coefficient of the environment on frequency according to the current sea level environment.
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| CN115421120A (en) * | 2022-08-04 | 2022-12-02 | 中国人民解放军91977部队 | Modeling Method of Electromagnetic Scattering Environment on Real Sea Surface |
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| CN115421120A (en) * | 2022-08-04 | 2022-12-02 | 中国人民解放军91977部队 | Modeling Method of Electromagnetic Scattering Environment on Real Sea Surface |
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