Modeling method and device of earth-moon channel, equipment and storage medium

Abstract

The invention provides an earth-moon channel modeling method, device and equipment and a storage medium, and the method comprises the steps: obtaining the equivalent radar sectional area of the moon and the multipath information of a multipath channel corresponding to a double-station radar; establishing a bistatic radar equation corresponding to the bistatic radar based on the equivalent radar sectional area; acquiring a Doppler frequency shift value and an atmospheric attenuation value; acquiring transmission loss corresponding to the double-station radar based on the double-station radar equation and the atmospheric attenuation value; and performing earth-moon channel modeling based on the Doppler frequency shift value, the multipath information and the transmission loss. According to the technical scheme of the invention, the method can achieve the precise simulation of the channel characteristics of earth-moon information, and achieves the building of a more accurate earth-moon channel model.

Description

Technical Field

[0001] The present application relates to the field of Earth-Moon communication technology, and in particular to a modeling method, device, equipment and storage medium for an Earth-Moon channel. Background Art

[0002] Earth-Moon-Earth communication uses the Moon as a natural reflector. During the communication process, the signal will experience severe attenuation due to long-distance transmission. At the same time, the delay spread caused by multipath propagation will also seriously affect the communication quality and reliability. Existing channel modeling methods often ignore or simply deal with the above influencing factors. Summary of the invention

[0003] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0004] In a first aspect, the present application proposes a method for modeling an Earth-Moon channel, the method comprising: obtaining an equivalent radar cross-section of the moon and multipath information of a multipath channel corresponding to a dual-station radar; establishing a dual-station radar equation corresponding to the dual-station radar based on the equivalent radar cross-section; obtaining a Doppler frequency shift value and an atmospheric attenuation value; obtaining a transmission loss corresponding to the dual-station radar based on the dual-station radar equation and the atmospheric attenuation value; and modeling the Earth-Moon channel based on the Doppler frequency shift value, the multipath information, and the transmission loss.

[0005] In one implementation, obtaining the equivalent radar cross-section of the moon includes: obtaining a radar band of the dual-station radar; determining a reflection coefficient of the lunar surface based on the radar band; and obtaining the equivalent radar cross-section based on the reflection coefficient and the lunar radius.

[0006] In one implementation, the atmospheric attenuation value includes at least one of the following: a rain attenuation value; a cloud and fog attenuation value; and an air attenuation value.

[0007] In one implementation, the obtaining of the Doppler frequency shift value includes: obtaining, based on a preset coordinate system, a velocity vector of the moon, a transmitting end line vector between the transmitting end radar in the dual-station radar and the moon, and a receiving end line vector between the receiving end radar in the dual-station radar and the moon; obtaining a transmitting end Doppler frequency shift value between the transmitting end radar and the moon based on the transmitting end line vector and the velocity vector; obtaining a receiving end Doppler frequency shift value between the receiving end radar and the moon based on the receiving end line vector and the velocity vector; and obtaining the Doppler frequency shift value based on the transmitting end Doppler frequency shift value and the receiving end Doppler frequency shift value.

[0008] In an optional implementation, the method of obtaining the velocity vector of the moon, the transmitting end line vector between the transmitting end radar in the bistatic radar and the moon, and the receiving end line vector between the receiving end radar in the bistatic radar and the moon based on a preset coordinate system includes: obtaining a first coordinate corresponding to the transmitting end radar in the bistatic radar, a second coordinate corresponding to the receiving end radar in the bistatic radar, a third coordinate corresponding to the moon, and the velocity vector of the moon based on the coordinate system; obtaining the transmitting end line vector based on the first coordinate and the third coordinate; and obtaining the receiving end line vector based on the second coordinate and the third coordinate.

[0009] In an optional implementation, the coordinate system is an Earth-centered Earth-fixed coordinate system.

[0010] In a second aspect, the present application proposes a modeling device for an Earth-Moon channel, the device comprising: a first acquisition module, used to obtain an equivalent radar cross-section of the moon and multipath information of a multipath channel corresponding to a dual-station radar; a first processing module, used to establish a dual-station radar equation corresponding to the dual-station radar based on the equivalent radar cross-section; a second acquisition module, used to obtain a Doppler frequency shift value and an atmospheric attenuation value; a second processing module, used to obtain a transmission loss corresponding to the dual-station radar based on the dual-station radar equation and the atmospheric attenuation value; and a channel modeling module, used to perform Earth-Moon channel modeling based on the Doppler frequency shift value, the multipath information and the transmission loss.

[0011] In one implementation, the first acquisition module can be used to: acquire a radar band of the dual-station radar; determine a reflection coefficient of the lunar surface based on the radar band; and acquire the equivalent radar cross-sectional area based on the reflection coefficient and the lunar radius.

[0012] In one implementation, the atmospheric attenuation value includes at least one of the following: a rain attenuation value; a cloud and fog attenuation value; and an air attenuation value.

[0013] In one implementation, the second acquisition module can be used to: acquire the velocity vector of the moon, the transmitting end line vector between the transmitting end radar in the dual-station radar and the moon, and the receiving end line vector between the receiving end radar in the dual-station radar and the moon based on a preset coordinate system; acquire the transmitting end Doppler frequency shift value between the transmitting end radar and the moon based on the transmitting end line vector and the velocity vector; acquire the receiving end Doppler frequency shift value between the receiving end radar and the moon based on the receiving end line vector and the velocity vector; acquire the Doppler frequency shift value based on the transmitting end Doppler frequency shift value and the receiving end Doppler frequency shift value.

[0014] In an optional implementation, the second acquisition module can be used to: acquire, based on the coordinate system, a first coordinate corresponding to the transmitting radar in the dual-station radar, a second coordinate corresponding to the receiving radar in the dual-station radar, a third coordinate corresponding to the moon, and a velocity vector of the moon; acquire the transmitting end connection vector based on the first coordinate and the third coordinate; acquire the receiving end connection vector based on the second coordinate and the third coordinate.

[0015] In an optional implementation, the coordinate system is an Earth-centered Earth-fixed coordinate system.

[0016] In a third aspect, the present application proposes an electronic device comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the Earth-Moon channel modeling method as described in the first aspect.

[0017] In a fourth aspect, the present application proposes a computer-readable storage medium for storing instructions, which, when executed, enables the method described in the first aspect to be implemented.

[0018] In a fifth aspect, the present application proposes a computer program product, comprising a computer program, which, when executed by a processor, implements the steps of the method for modeling the Earth-Moon channel as described in the first aspect.

[0019] The modeling method, device, equipment and storage medium of the Earth-Moon channel provided in this application can obtain the dual-station radar equation corresponding to the dual-station radar used for Earth-Moon communication based on the equivalent radar cross-sectional area of ​​the moon, and obtain the transmission loss of the dual-station radar based on the dual-station radar equation and the atmospheric attenuation value, so as to combine the obtained Doppler frequency shift value and multipath information to model the Earth-Moon channel. It is possible to achieve accurate simulation of the channel characteristics of Earth-Moon information, thereby establishing a more accurate Earth-Moon channel model.

[0020] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0022] Figure 1 It is a flow chart of a method for modeling an Earth-Moon channel provided in an embodiment of the present application;

[0023] Figure 2It is a flowchart of another Earth-Moon channel modeling method provided in an embodiment of the present application;

[0024] Figure 3 It is a flowchart of another method for modeling an Earth-Moon channel provided in an embodiment of the present application;

[0025] Figure 4 It is a structural schematic diagram of a modeling device of an Earth-Moon channel provided in an embodiment of the present application;

[0026] Figure 5 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0028] The following describes the Earth-Moon channel modeling method and device according to an embodiment of the present application with reference to the accompanying drawings.

[0029] Figure 1 FIG. 1 is a flow chart of a method for modeling a Earth-Moon channel provided in an embodiment of the present application. Figure 1 As shown, the method may include but is not limited to the following steps:

[0030] Step S101: Obtain the equivalent radar cross-section of the moon and the multipath information of the multipath channel corresponding to the dual-station radar.

[0031] Exemplarily, the moon as a whole is taken as a radar reflector to obtain the moon's equivalent radar cross-sectional area, and the multipath information of the multipath channel corresponding to the dual-station radar is obtained.

[0032] In the embodiments of the present application, the terms "dual-station radar" and "bistatic radar" can be used interchangeably.

[0033] In an embodiment of the present application, the above-mentioned dual-station radar may be set on the earth.

[0034] Step S102: establishing a bistatic radar equation corresponding to the bistatic radar based on the equivalent radar cross section.

[0035] Exemplarily, the classical bistatic radar equation is expressed as follows:

[0036]

[0037] Among them, P T is the transmitting power of the dual-station radar, P ris the receiving power of the dual-station radar, G T is the transmitting antenna gain of the bistatic radar, G R is the receiving antenna gain of the dual-station radar, λ is the wavelength of the electromagnetic wave, σ is the radar cross-sectional area of ​​the reflector, and D T is the distance between the dual-station radar and the reflector radar, D R is the distance between the receiving end of the bistatic radar and the reflector radar. The bistatic radar equation corresponding to the bistatic radar used for Earth-Moon communication can be obtained by replacing the reflector radar cross-section in the classic bistatic radar with the equivalent radar cross-section of the moon.

[0038] Step S103: Obtaining Doppler frequency shift value and atmospheric attenuation value.

[0039] In an embodiment of the present application, the above-mentioned atmospheric attenuation value includes at least one of the following: rain attenuation value; cloud and fog attenuation value; air attenuation value.

[0040] As an example, the calculation formula of the rain attenuation value can be expressed as follows:

[0041] L r =γD

[0042] Among them, L r is the rain attenuation value, γ is the attenuation value per kilometer (dB / km), and D is the effective path length (km), that is, the distance of the rain area that the radar signal passes through. The specific value of γ is related to the rainfall intensity (mm / h) and the two polarization coefficients. The effective path length D is related to the elevation angle of electromagnetic wave propagation and the height of the rain area. The elevation angle of electromagnetic wave propagation can be calculated based on the geometric relationship between the transceiver station and the moon.

[0043] As an example, the calculation formula of the cloud attenuation value can be expressed as follows:

[0044]

[0045] Among them, L c is the cloud attenuation value, K is the cloud liquid mass absorption coefficient, L is the comprehensive cloud liquid water content on the surface of the transmitting and receiving positions, in kg / or mm, and θ is the elevation angle of electromagnetic wave propagation.

[0046] As an example, the calculation formula of the gas attenuation value can be expressed as follows:

[0047]

[0048] Among them, L g is the gas attenuation value, A o and A w They correspond to the attenuation caused by dry air and water vapor respectively, and θ is the elevation angle of electromagnetic wave propagation.

[0049] Step S104: Based on the bistatic radar equation and the atmospheric attenuation value, the transmission loss corresponding to the bistatic radar is obtained.

[0050] For example, the equivalent radar cross section of the moon is σ m For example, the dual-station radar equation after considering the atmospheric attenuation value can be expressed as follows:

[0051]

[0052] Among them, σ m is the equivalent radar cross section of the moon, L rcg is the atmospheric attenuation value. Then the transmission loss corresponding to the dual-station radar can be expressed as follows:

[0053] L≈33+20log 10 (D T D R )+10log 10 (L rcg )-10log 10 (G T G R σ)-20log 10 (λ)

[0054] Where L is the transmission loss, G T is the transmitting antenna gain of the bistatic radar, G R is the receiving antenna gain of the dual-station radar, λ is the wavelength of the electromagnetic wave, σ is the radar cross-sectional area of ​​the reflector, and D T is the distance between the dual-station radar and the reflector radar, D R is the distance between the dual-station radar receiving end and the reflector radar.

[0055] Step S105: Modeling the Earth-Moon channel based on the Doppler frequency shift value, multipath information and transmission loss.

[0056] By implementing the embodiments of the present application, the bistatic radar equation corresponding to the bistatic radar used for Earth-Moon communication can be obtained based on the equivalent radar cross-sectional area of ​​the moon, and the transmission loss of the bistatic radar can be obtained based on the bistatic radar equation and the atmospheric attenuation value, so as to combine the obtained Doppler frequency shift value and multipath information to perform Earth-Moon channel modeling. It is possible to achieve accurate simulation of the channel characteristics of Earth-Moon information, thereby establishing a more accurate Earth-Moon channel model.

[0057] In some embodiments, the equivalent radar cross section of the moon can be obtained based on the relevant information of the moon. As an example, see Figure 2 , Figure 2 It is a flow chart of another method for modeling the Earth-Moon channel provided in an embodiment of the present application.

[0058] like Figure 2As shown, the method may include but is not limited to the following steps:

[0059] Step S201: Acquire the radar band of the dual-station radar.

[0060] Step S202: Determine the reflection coefficient of the lunar surface based on the radar band.

[0061] Exemplarily, if the radar band of the dual-station radar is from the L band to the X band, the value range of the reflection coefficient may be 0.05 to 0.13.

[0062] Step S203: Obtaining an equivalent radar cross-section based on the reflection coefficient and the lunar radius.

[0063] For example, the equivalent radar cross section can be expressed as follows:

[0064]

[0065] Among them, σ m is the equivalent radar cross-section area, k is the reflection coefficient, r m is the radius of the moon.

[0066] Step S204: establishing a bistatic radar equation corresponding to the bistatic radar based on the equivalent radar cross section.

[0067] In the embodiments of the present application, step S204 can be implemented by any of the methods in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0068] Step S205: Obtaining Doppler frequency shift value and atmospheric attenuation value.

[0069] In the embodiments of the present application, step S205 can be implemented by any of the methods in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0070] Step S206: Based on the bistatic radar equation and the atmospheric attenuation value, the transmission loss corresponding to the bistatic radar is obtained.

[0071] In the embodiments of the present application, step S206 can be implemented by any of the methods in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0072] Step S207: Modeling the Earth-Moon channel based on the Doppler frequency shift value, multipath information and transmission loss.

[0073] In the embodiments of the present application, step S207 can be implemented by any of the methods in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0074] By implementing the embodiments of the present application, the reflection coefficient corresponding to the moon can be determined based on the radar band of the bistatic radar, so as to obtain the equivalent radar cross-sectional area corresponding to the moon based on the reflection coefficient, and then obtain the bistatic radar equation corresponding to the bistatic radar according to the equivalent radar cross-sectional area, so as to perform Earth-Moon channel modeling based on the bistatic radar equation. The simulation accuracy of the channel characteristics can be improved, thereby improving the modeling accuracy of the channel modeling.

[0075] In some embodiments, the Doppler shift value can be obtained based on the relative position of the dual-station radar and the moon. As an example, see Figure 3 , Figure 3 FIG. 1 is a flow chart of another method for modeling the Earth-Moon channel provided in an embodiment of the present application. Figure 3 As shown, the method may include but is not limited to the following steps:

[0076] Step S301: Obtain the equivalent radar cross-section of the moon and the multipath information of the multipath channel corresponding to the dual-station radar.

[0077] In the embodiments of the present application, step S301 can be implemented in any of the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0078] Step S302: establishing a bistatic radar equation corresponding to the bistatic radar based on the equivalent radar cross section.

[0079] In the embodiments of the present application, step S302 can be implemented by any of the methods in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0080] Step S303: Based on a preset coordinate system, the velocity vector of the moon, the transmitting end connection vector between the transmitting end radar in the bistatic radar and the moon, and the receiving end connection vector between the receiving end radar in the bistatic radar and the moon are obtained.

[0081] Exemplarily, the coordinates corresponding to the dual-station radar and the coordinates corresponding to the moon are obtained in a preset coordinate system, so as to obtain the velocity vector, the transmitting end connection vector and the receiving end connection vector of the moon based on the above coordinates.

[0082] In an optional implementation, based on a preset coordinate system, obtaining the velocity vector of the moon, the transmitting end connection vector between the transmitting end radar in the bistatic radar and the moon, and the receiving end connection vector between the receiving end radar in the bistatic radar and the moon may include the following steps:

[0083] Step A1: Based on the coordinate system, obtain a first coordinate corresponding to the transmitting radar in the bistatic radar, a second coordinate corresponding to the receiving radar in the bistatic radar, a third coordinate corresponding to the moon, and a velocity vector of the moon.

[0084] Exemplarily, a velocity vector of the moon relative to the earth, a first coordinate corresponding to a transmitting radar in a bistatic radar, a second coordinate corresponding to a receiving radar in the bistatic radar, and a third coordinate corresponding to the moon are obtained based on the coordinate system.

[0085] Step A2: Based on the first coordinate and the third coordinate, obtain the transmitting end connection vector.

[0086] Exemplarily, the transmitting end connection vector may be expressed as follows:

[0087] MT=(x m -x T ,y m -y T ,z m -z T )

[0088] Among them, MT is the connecting vector of the transmitting end, x T ,y T and z T is the coordinate value of the first coordinate, x m ,y m and z m is the coordinate value of the third coordinate.

[0089] Step A3: Based on the second coordinate and the third coordinate, obtain the receiving end connection vector.

[0090] Exemplarily, the receiving end connection vector may be expressed as follows:

[0091] MR=(x m -x R ,y m -y R ,z m -z R )

[0092] Among them, MR is the transmitting end connection vector, x R ,y R and z R is the coordinate value of the second coordinate, x m ,y m and z m is the coordinate value of the third coordinate.

[0093] In some embodiments, the preset coordinate system may be an ECEF (Earth-Centered, Earth-Fixed) coordinate system.

[0094] Step S304: Based on the transmitting end connection vector and the velocity vector, the transmitting end Doppler frequency shift value between the transmitting end radar and the moon is obtained.

[0095] For example, the angle between the transmitting end connection vector and the velocity vector can be expressed as follows:

[0096]

[0097] Among them, θ 1 is the angle between the transmitter line vector and the velocity vector, MT is the transmitter line vector, and v is the velocity scalar value.

[0098] The Doppler frequency shift value at the transmitting end can be expressed as follows:

[0099]

[0100] Among them, f T is the Doppler frequency shift value of the transmitting end, MT is the connecting vector of the transmitting end, v is the velocity scalar value, and λ is the wavelength of the electromagnetic wave.

[0101] Step S305: Based on the receiving end connection vector and the velocity vector, the receiving end Doppler frequency shift value between the receiving end radar and the moon is obtained.

[0102] Exemplarily, the angle between the receiving end connection vector and the velocity vector can be expressed as follows:

[0103]

[0104] Among them, θ 2 is the angle between the receiving end connection vector and the velocity vector, MT is the transmitting end connection vector, and v is the velocity scalar value.

[0105] The Doppler frequency shift value at the receiving end can be expressed as follows:

[0106]

[0107] Among them, f R is the Doppler frequency shift value of the transmitting end, MR is the connecting line vector of the transmitting end, v is the velocity scalar value, and λ is the wavelength of the electromagnetic wave.

[0108] Step S306: Acquire a Doppler frequency shift value based on the Doppler frequency shift value of the transmitting end and the Doppler frequency shift value of the receiving end.

[0109] Exemplarily, the Doppler shift value may be expressed as follows:

[0110] f d =f T +f R

[0111] Among them, f d is the Doppler frequency shift value, f T is the Doppler frequency shift value at the transmitting end, f R is the Doppler frequency shift value at the receiving end.

[0112] Step S307: Obtaining the atmospheric attenuation value.

[0113] In the embodiments of the present application, step S307 can be implemented by any of the methods in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0114] Step S308: Based on the bistatic radar equation and the atmospheric attenuation value, the transmission loss corresponding to the bistatic radar is obtained.

[0115] In the embodiments of the present application, step S308 can be implemented in any of the ways in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0116] Step S309: Modeling the Earth-Moon channel based on the Doppler frequency shift value, multipath information and transmission loss.

[0117] In the embodiments of the present application, step S309 can be implemented in any of the ways in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0118] By implementing the embodiments of the present application, the coordinates of the dual-station radar transmitter, receiver, and moon can be obtained based on a preset coordinate system, so as to obtain the Doppler shift value of the transmitter and the Doppler shift value of the receiver based on the above coordinates. Then, the total Doppler shift value is obtained. Thus, the Earth-Moon channel modeling is performed based on the Doppler shift value, multipath information, and transmission loss. It is possible to achieve accurate simulation of the channel characteristics of the Earth-Moon information, thereby establishing a more accurate Earth-Moon channel model.

[0119] See also Figure 4 , Figure 4 Schematic diagram of a structure of a modeling device for an Earth-Moon channel provided in an embodiment of the present application. Figure 4 As shown, the device 400 includes: a first acquisition module 401, used to obtain the equivalent radar cross-section of the moon and the multipath information of the multipath channel corresponding to the bistatic radar; a first processing module 402, used to establish the bistatic radar equation corresponding to the bistatic radar based on the equivalent radar cross-section; a second acquisition module 403, used to obtain the Doppler frequency shift value and the atmospheric attenuation value; a second processing module 404, used to obtain the transmission loss corresponding to the bistatic radar based on the bistatic radar equation and the atmospheric attenuation value; a channel modeling module 405, used to perform Earth-Moon channel modeling based on the Doppler frequency shift value, multipath information and transmission loss.

[0120] In one implementation, the first acquisition module 401 may be used to: acquire a radar band of a dual-station radar; determine a reflection coefficient of the lunar surface based on the radar band; and acquire an equivalent radar cross-sectional area based on the reflection coefficient and the lunar radius.

[0121] In one implementation, the atmospheric attenuation value includes at least one of the following: a rain attenuation value; a cloud and fog attenuation value; and an air attenuation value.

[0122] In one implementation, the second acquisition module 403 can be used to: obtain the velocity vector of the moon, the transmitting end line vector between the transmitting end radar in the dual-station radar and the moon, and the receiving end line vector between the receiving end radar in the dual-station radar and the moon based on a preset coordinate system; obtain the transmitting end Doppler frequency shift value between the transmitting end radar and the moon based on the transmitting end line vector and the velocity vector; obtain the receiving end Doppler frequency shift value between the receiving end radar and the moon based on the receiving end line vector and the velocity vector; obtain the Doppler frequency shift value based on the transmitting end Doppler frequency shift value and the receiving end Doppler frequency shift value.

[0123] In an optional implementation, the second acquisition module 403 can be used to: acquire, based on the coordinate system, a first coordinate corresponding to a transmitting radar in a dual-station radar, a second coordinate corresponding to a receiving radar in the dual-station radar, a third coordinate corresponding to the moon, and a velocity vector of the moon; acquire a transmitting end connection vector based on the first coordinate and the third coordinate; and acquire a receiving end connection vector based on the second coordinate and the third coordinate.

[0124] In an optional implementation, the coordinate system is an Earth-centered, Earth-fixed coordinate system.

[0125] Through the device of the embodiment of the present application, the bistatic radar equation corresponding to the bistatic radar used for Earth-Moon communication can be obtained based on the equivalent radar cross-section of the moon, so as to obtain the transmission loss of the bistatic radar based on the bistatic radar equation and the atmospheric attenuation value, thereby combining the obtained Doppler frequency shift value and multipath information to perform Earth-Moon channel modeling. It is possible to achieve accurate simulation of the channel characteristics of Earth-Moon information, thereby establishing a more accurate Earth-Moon channel model.

[0126] It should be noted that the above explanation of the embodiment of the method for modeling the Earth-Moon channel is also applicable to the device for modeling the Earth-Moon channel of this embodiment, and will not be repeated here.

[0127] In order to implement the above embodiment, the present application also proposes an electronic device. Figure 5 , Figure 5 Schematic diagram of the structure of the electronic device provided in the embodiment of the present application. Figure 5 As shown, the electronic device 500 includes: a processor 501, and a memory 502 communicatively connected to the processor 501; the memory 502 stores computer-executable instructions; the processor 501 executes the computer-executable instructions stored in the memory to implement the method provided in the aforementioned embodiment.

[0128] In order to implement the above embodiments, the present application also proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the methods provided by the above embodiments.

[0129] In order to implement the above embodiments, the present application also proposes a computer program product, including a computer program, which implements the methods provided by the above embodiments when executed by a processor.

[0130] In the description of this application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in this article is merely a way to describe the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0131] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0132] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0133] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0134] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0135] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0136] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0137] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0138] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for modeling an Earth-Moon channel, characterized in that: include: Obtain the equivalent radar cross-section of the moon and the multipath information of the corresponding multipath channels of the dual-station radar; Establishing a bistatic radar equation corresponding to the bistatic radar based on the equivalent radar cross-section; Obtain Doppler frequency shift value and atmospheric attenuation value; Based on the bistatic radar equation and the atmospheric attenuation value, obtaining a transmission loss corresponding to the bistatic radar; The Earth-Moon channel modeling is performed based on the Doppler frequency shift value, the multipath information and the transmission loss.

2. The method according to claim 1, characterized in that The step of obtaining the equivalent radar cross-section of the moon comprises: Obtaining the radar band of the dual-station radar; determining a reflectivity of the lunar surface based on the radar band; The equivalent radar cross-section is obtained based on the reflection coefficient and the lunar radius.

3. The method according to claim 1, characterized in that The atmospheric attenuation value includes at least one of the following: Rain attenuation value; Cloud attenuation value; Gas attenuation value.

4. The method according to claim 1, characterized in that The obtaining of the Doppler frequency shift value comprises: Based on a preset coordinate system, a velocity vector of the moon, a transmitting end connection vector between a transmitting end radar in the bistatic radar and the moon, and a receiving end connection vector between a receiving end radar in the bistatic radar and the moon are obtained; Based on the transmitting end connecting line vector and the velocity vector, obtaining a transmitting end Doppler frequency shift value between the transmitting end radar and the moon; Based on the receiving end connection vector and the velocity vector, obtaining a receiving end Doppler frequency shift value between the receiving end radar and the moon; The Doppler frequency shift value is acquired based on the transmitting end Doppler frequency shift value and the receiving end Doppler frequency shift value.

5. The method according to claim 4, characterized in that The method of obtaining the velocity vector of the moon, the transmitting end connection vector between the transmitting end radar in the bistatic radar and the moon, and the receiving end connection vector between the receiving end radar in the bistatic radar and the moon based on a preset coordinate system includes: Based on the coordinate system, obtain a first coordinate corresponding to a transmitting radar in the bistatic radar, a second coordinate corresponding to a receiving radar in the bistatic radar, a third coordinate corresponding to the moon, and a velocity vector of the moon; Based on the first coordinate and the third coordinate, obtaining the transmitting end connection vector; The receiving end connection vector is acquired based on the second coordinate and the third coordinate.

6. The method according to claim 4, characterized in that The coordinate system is an Earth-centered Earth-fixed coordinate system.

7. A modeling device for an Earth-Moon channel, characterized in that: include: The first acquisition module is used to obtain the equivalent radar cross-section of the moon and the multipath information of the multipath channel corresponding to the dual-station radar; A first processing module, configured to establish a bistatic radar equation corresponding to the bistatic radar based on the equivalent radar cross-section; The second acquisition module is used to obtain the Doppler frequency shift value and the atmospheric attenuation value; A second processing module is used to obtain the transmission loss corresponding to the bistatic radar based on the bistatic radar equation and the atmospheric attenuation value; A channel modeling module is used to perform Earth-Moon channel modeling based on the Doppler frequency shift value, the multipath information and the transmission loss.

8. An electronic device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the computer program implements the method according to any one of claims 1 to 6.

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