CN114826430B - Laser cross-medium communication method and device, electronic equipment and storage medium - Google Patents
Laser cross-medium communication method and device, electronic equipment and storage medium Download PDFInfo
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Abstract
The invention provides a laser cross-medium communication method, a device, electronic equipment and a storage medium, which relate to the technical field of laser communication, and the method comprises the following steps: receiving a laser beam sent by a transmitting end, wherein the laser beam carries out cross-medium transmission; simulating the motion track of photons in the laser beam, and determining the mean square beam waist width range of the laser beam; under the condition of seawater turbulence, the mean square beam waist width of the laser beam is determined based on the cross-medium transmission characteristics of the laser beam and the mean square beam waist width range of the laser beam, wherein the mean square beam waist width is used for determining communication equipment parameters of the laser beam, and laser cross-medium communication is realized. The invention can realize the cross-medium high-speed remote communication of the laser beam under water, on the water surface and on the water, and reduce the cross-medium influence of the laser beam.
Description
Technical Field
The present invention relates to the field of laser communication technologies, and in particular, to a laser cross-medium communication method and apparatus, an electronic device, and a storage medium.
Background
The underwater-water surface-overwater cross-medium communication refers to a communication mode that signals are transmitted by an underwater transmitter, sequentially pass through an underwater medium, a water-gas interface and an atmospheric medium, and are received by a receiving end in the atmospheric medium. With the increasing demand for ocean resource development and scientific investigation, the underwater-water surface-water based cross-medium communication technology gradually becomes an emerging key technology in the future ocean exploration field.
In the prior art, the cross-medium communication between underwater and water surface mainly samples low-frequency and very-low-frequency electric waves for low-bandwidth and low-speed communication, and a laser beam carrying signals is limited by water body environment influences such as seawater turbulence, atmospheric turbulence, water-air interface sea waves, optical refraction and optical reflection, so that the cross-medium high-speed interconnection and intercommunication of the laser signals cannot be effectively carried out on a large scale.
Disclosure of Invention
The invention provides a laser cross-medium communication method, a laser cross-medium communication device, electronic equipment and a storage medium, which are used for overcoming the defect that a laser beam is influenced by a water body environment in the prior art, realizing the underwater-water surface-overwater cross-medium high-speed remote communication of the laser beam and reducing the cross-medium influence of the laser beam.
The invention provides a laser cross-medium communication method, which comprises the following steps:
receiving a laser beam sent by a laser transmitter, wherein the laser beam is transmitted across a medium;
simulating the motion trail of photons in the laser beam and determining the mean square beam waist width range of the laser beam;
under the condition of seawater turbulence, determining the mean square beam waist width of the laser beam based on the cross-medium transmission characteristics of the laser beam and the mean square beam waist width range of the laser beam, wherein the mean square beam waist width is used for determining communication equipment parameters of the laser beam, and laser cross-medium communication is realized.
According to the laser cross-medium communication method provided by the invention, the simulating the motion trail of photons in the laser beam and determining the mean square beam waist width range of the laser beam comprise:
determining a motion parameter for each photon in the laser beam;
determining the initial motion direction coordinate and the terminal coordinate after the motion limited time of each photon in the laser beam based on the motion parameter of each photon;
comparing the initial motion direction coordinate of each photon with the real number to determine the motion direction of each photon;
and comparing the terminal point coordinate of each photon with the height threshold value under the condition that the motion direction of the photon faces to the water-gas interface, and determining the photon transmission success rate and the mean square beam waist width range of the laser beam.
According to the laser cross-medium communication method provided by the invention, the step of comparing the initial motion direction coordinate of each photon with a real number to determine the motion direction of each photon comprises the following steps:
if the initial motion direction coordinate of the photon belongs to a real number, the motion direction of the photon faces to a water-gas interface;
and if the initial motion direction coordinate of the photon belongs to a negative number, the motion direction of the photon faces to the depth of the underwater medium.
According to the laser cross-medium communication method provided by the invention, under the condition that the movement direction of photons faces to a water-gas interface, the terminal coordinate of each photon is compared with the height threshold value, and the photon transmission success rate and the mean square beam waist width range of a laser beam are determined, wherein the method comprises the following steps:
under the condition that the motion direction of the photon faces to a water-gas interface, if the coordinate height of the endpoint of the photon is greater than a height threshold value, the photon is refracted across media;
if the coordinate height of the end point of the photon is less than or equal to the height threshold, the photon is internally reflected in the same medium;
iteratively comparing the coordinate height of the end point of each photon with a height threshold value to determine the number of received photons;
determining a photon transmission success rate of the laser beam based on the received photon number;
based on the spot formed by the received photons, a mean square beam waist width range of the laser beam is determined.
According to the laser cross-medium communication method provided by the invention, in a seawater turbulence condition, the mean square beam waist width of the laser beam is determined based on the cross-medium transmission characteristic of the laser beam and the mean square beam waist width range of the laser beam, wherein the mean square beam waist width is used for determining the communication equipment parameters of the laser beam, so that the laser cross-medium communication is realized, and the method comprises the following steps:
determining a transmission parameter of the laser beam based on the cross-medium transmission characteristic of the laser beam and the mean square beam waist width range of the laser beam under the condition of seawater turbulence;
determining a mean square beam waist width of the laser beam based on the transmission parameters of the laser beam.
The laser cross-medium communication method provided by the invention further comprises the following steps:
and determining the incidence relation between the vertical communication distance and the mean square beam waist width, wherein the vertical communication distance corresponds to the mean square beam waist width one to one.
The present invention also provides a laser cross-medium communication device, comprising:
the receiving module is used for receiving a laser beam sent by a laser transmitter, and the laser beam carries out cross-medium transmission;
the first determining module is used for simulating the motion trail of photons in the laser beam and determining the mean square beam waist width range of the laser beam;
and the second determination module is used for determining the mean square beam waist width of the laser beam based on the cross-medium transmission characteristics of the laser beam and the mean square beam waist width range of the laser beam under the condition of seawater turbulence, wherein the mean square beam waist width is used for determining communication equipment parameters of the laser beam to realize laser cross-medium communication.
According to the laser cross-medium communication device provided by the invention, the laser cross-medium communication device further comprises:
and the third determining module is used for determining the incidence relation between the vertical communication distance and the mean square beam waist width, wherein the vertical communication distance corresponds to the mean square beam waist width one to one.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the laser cross-medium communication method.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a laser cross-media communication method as described in any of the above.
According to the laser cross-medium communication method, the laser cross-medium communication device, the electronic equipment and the storage medium, the mean square beam waist width range of the laser beam is determined by simulating the motion track of photons in the laser beam transmitted through the cross-medium under the condition that the laser beam is subjected to atmospheric turbulence, water-gas interface sea waves and optical refraction and reflection at a water-gas interface, the mean square beam waist width of the laser beam is determined based on the cross-medium transmission characteristic and the mean square beam waist width range of the laser beam under the condition of seawater turbulence, the communication equipment parameters are further determined based on the mean square beam waist width, the cross-medium influence of the laser beam in a water body environment is reduced, and further the cross-medium high-speed remote communication of the laser beam is realized.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a laser cross-medium communication method provided by the present invention;
FIG. 2 is a second schematic flow chart of a laser cross-medium communication method provided by the present invention;
FIG. 3 is a schematic illustration of laser beam cross-media communication provided by the present invention;
FIG. 4 is a schematic diagram of laser beam transmission under turbulent flow of seawater provided by the present invention;
FIG. 5 is a schematic diagram illustrating the correlation between mean square beam waist width and vertical communication distance provided by the present invention;
FIG. 6 is a schematic structural diagram of a laser cross-medium communication device provided by the present invention;
fig. 7 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The laser cross-medium communication method of the present invention is described below with reference to fig. 1-5.
Fig. 1 is a schematic flow chart of a laser cross-medium communication method provided by the present invention, as shown in fig. 1, the method includes:
and 110, receiving the laser beam sent by the transmitting end, wherein the laser beam is transmitted across the medium.
Specifically, in order to realize high-speed remote communication, the receiving end receives a laser beam sent by the transmitting end, wherein the laser beam sequentially penetrates through an underwater medium, a water-gas interface and an atmospheric medium and then is received by the receiving end in sequence, and the laser beam can be a single Gaussian beam or an array Gaussian beam.
Optionally, the transmitting end may be a single laser transmitter or an array laser transmitter.
Alternatively, the receiving end may be a receiving end of an aircraft, and the laser beam refracted at the water-air interface is received in an atmospheric medium.
It should be noted that after the laser beam is emitted, the movement direction of the photons can move towards the water-air interface or towards the depth of the underwater medium; under the condition that the movement direction of the photons faces the water-gas interface, if the photons are reflected at the water-gas interface, the photons are filtered out and cannot be received by the receiving terminal, and the receiving terminal only receives the photons refracted at the water-gas interface.
And 120, simulating the motion track of photons in the laser beam, and determining the mean square beam waist width range of the laser beam.
Specifically, the transmission distance and performance of the laser beam in the cross-medium communication are limited by the influence of water environments such as atmospheric turbulence, water-air interface sea waves, optical refraction and optical reflection.
Optionally, fig. 2 is a second schematic flow chart of the laser cross-medium communication method provided by the present invention, and as shown in fig. 2, the method for determining the mean square beam waist width range includes:
determining a motion parameter for each photon in the laser beam;
determining an initial motion direction coordinate and an end point coordinate after motion limited time of each photon in the laser beam based on the motion parameter of each photon;
comparing the initial motion direction coordinate of each photon with the real number to determine the motion direction of each photon;
and comparing the terminal point coordinate of each photon with the height threshold value under the condition that the motion direction of the photon faces to the water-gas interface, and determining the photon transmission success rate and the mean square beam waist width range of the laser beam.
In order to simulate the movement track of a laser beam in cross-medium communication, the movement parameter of each photon is determined firstly, a part of photons moving towards the deep part of an underwater medium are filtered through the comparison result of the initial movement direction coordinate of the photons and a real number, the part of photons are not subjected to cross-medium communication, the terminal coordinate of the photon is compared with a height threshold value after the movement of the photons is limited, whether the photons penetrate through a water-air interface to be refracted is further determined, if the photons penetrate through the water-air interface to be refracted, the photons are received by a receiving end, and if the photons are reflected on the water-air interface, the receiving end fails to receive, namely the photons are filtered. The photon transmission success rate of the laser beam is determined by counting the number of photons which penetrate through a water-gas interface and are refracted, namely the number of received photons, so that the transmission performance of the laser beam is further embodied, and the mean square beam waist width range of the laser beam in cross-medium communication is determined by the light spots formed by the received photons at the receiving end.
Alternatively, the above-mentioned limited time may be determined according to an empirical value, or a machine learning algorithm may be adopted to predict based on the cross-medium communication historical data.
Optionally, the height threshold may be a vertical height from the emission end to the water-gas interface, and the comparison between the terminal coordinate of the photon and the height threshold is used to determine whether the photon crosses the water-gas interface and enters the atmosphere medium, that is, whether the photon is refracted at the water-gas interface.
Optionally, the method for determining the motion direction of each photon comprises:
if the initial motion direction coordinate of the photon belongs to a real number, the motion direction of the photon faces to a water-gas interface;
if the initial motion direction coordinate of the photon belongs to a negative number, the motion direction of the photon faces to the deep part of the underwater medium.
Specifically, fig. 3 is a schematic diagram of cross-medium communication of a laser beam provided by the present invention, as shown in fig. 3, with an emitting end as an origin, if an initial motion direction coordinate of a photon belongs to a real number, the photon moves toward a water-gas interface, that is, the photon moves toward a receiving end, and cross-medium transmission may be performed and received by the receiving end; if the initial motion direction coordinate of the photon belongs to a negative number, the photon moves towards the depth of the underwater medium, namely the photon always moves in the underwater medium without cross-medium transmission, and the receiving end cannot receive the photon.
Optionally, the method for determining the photon transmission success rate and the mean square beam waist width includes:
under the condition that the motion direction of the photon faces to a water-gas interface, if the coordinate height of the end point of the photon is greater than a height threshold value, the photon is refracted across the medium;
if the coordinate height of the end point of the photon is less than or equal to the height threshold, the photon is internally reflected by the same medium;
iteratively comparing the coordinate height of the end point of each photon with a height threshold value to determine the number of received photons;
determining a photon transmission success rate of the laser beam based on the number of received photons;
based on the spot formed by the received photons, a mean square beam waist width range of the laser beam is determined.
Specifically, as shown in fig. 3, in order to determine the transmission performance of the laser beam in the cross-medium, whether the end point coordinate after motion limitation of each photon is greater than a height threshold is used for judging, if the end point coordinate of the photon is greater than the height threshold, the photon is refracted at a water-air interface, the photon passes through the water-air interface, is transmitted in an atmospheric medium and is received by a receiving end, if the end point coordinate of the photon is less than or equal to the height threshold, the photon is emitted at the water-air interface, is filtered, and the photon transmission success rate and the beam waist width range of the laser beam are respectively determined through the number of the received photons and the formed light spot, so that the transmission performance of the laser beam in cross-medium communication is intuitively embodied.
Alternatively, the above-mentioned limit time may be set by an empirical value, or may be predicted by using a machine learning algorithm in combination with the optical signal transmission speed.
Optionally, the calculation formula of the photon transmission success rate is shown as formula (1), where formula (1) is:
wherein the content of the first and second substances,
indicating the success rate of the transmission of photons,
indicating the number of photons received by the receiving end,
representing the total number of photons.
Optionally, the motion parameters of each photon may include: the system comprises an initial motion direction coordinate of photons, an incident angle of the photons in an underwater medium, a refraction angle of the photons at a water-gas interface, a reflection angle of the photons at the water-gas interface and a corresponding sea wave inclination angle.
Specifically, fig. 4 is a schematic diagram of laser beam transmission under the condition of seawater turbulence provided by the invention, as shown in fig. 4, the terminal coordinate after the photon motion limited time is
The calculation formula of the endpoint coordinate is shown in formula (2) to formula (3), and formula (2) is:
the formula (3) is:
wherein the content of the first and second substances,
the moving direction of the ocean waves is shown, and the moving direction of the ocean waves is determined by the inclination angle of the ocean waves,
represents the two-dimensional abscissa of the motion of the sea waves,
represents a two-dimensional ordinate of the wave motion,
which represents the direction of the initial movement of the photon,
representing the two-dimensional abscissa of the initial motion of the photon,
representing the two-dimensional ordinate of the initial motion of the photon,
representing the angle of refraction of the photons at the water-gas interface,
representing the coordinates of the end point of the photon after a defined time of movement,
representing the two-dimensional abscissa after a defined time of photon motion,
representing the two-dimensional ordinate after a defined time of photon motion.
And 130, under the condition of seawater turbulence, determining the mean square beam waist width of the laser beam based on the cross-medium transmission characteristics of the laser beam and the mean square beam waist width range of the laser beam, wherein the mean square beam waist width is used for determining the communication equipment parameters of the laser beam, and the laser cross-medium communication is realized.
Specifically, in consideration of the fluctuation influence of seawater turbulence on the refractive index of the laser beam, the cross spectrum density function of the laser beam, the light intensity based on the Huygens-Fresnel law and the turbulence refractive index fluctuation energy spectrum are obtained based on the seawater turbulence environment, partial parameter values of the three functions are determined through the mean square beam waist width range, the mean square beam waist width is further determined by combining the three functions, and the communication equipment parameter of laser cross-medium communication is determined through the mean square beam waist width, so that the cross-medium communication of the laser beam is realized.
Optionally, the method for determining the mean square beam waist width of the laser beam comprises:
determining transmission parameters of the laser beams under the condition of seawater turbulence based on the cross-medium transmission characteristics of the laser beams and the mean square beam waist width range of the laser beams;
a mean-square beam waist width of the laser beam is determined based on the transmission parameters of the laser beam.
Optionally, the transmission parameters of the laser beam include a cross spectral density function, a light intensity based on huygens-fresnel law, and a turbulent refractive index fluctuation spectrum.
Cross spectral density function of the laser beam
The formula (4) is shown as formula (4), and the formula (4) is:
wherein the content of the first and second substances,
the beam waist width of the single beam non-paraxial Gaussian beam at the initial distance is represented, the initial distance is calculated when the light source center is taken as an origin, and the z-axis coordinate value of the photon transmission coordinate towards the vertical upper part is 0,
and
representing two cross-wise gaussian beams of light,
representing the distance between two adjacent gaussian beams,
and
respectively representing the number of intervals between two randomly selected Gaussian beams in the array Gaussian beams and the origin.
The above-mentioned Huygens-Fresnel law-based light intensity
The formula (5) is shown as the formula (5):
wherein the content of the first and second substances,
a beam representing a light wave, z represents a z-axis coordinate value transmitting a coordinate vertically upward with a center of the light source as an origin,
which is indicative of the refractive index of the turbulent flow,
showing the turbulent refractive index fluctuation spectrum.
The above turbulent refractive index fluctuation spectrum
The formula (6) is shown as formula (6), and the formula (6) is:
wherein the content of the first and second substances,
which represents the rate of turbulent kinetic energy dissipation,
which is indicative of the refractive index of the turbulent flow,
the expression is shown in the form of a Komo micro-scale,
the dissipation rate representing the mean square temperature,
representing the parameters of the sea water related to temperature and salinity,
and
all represent parameters, and
。
optionally, the cross spectral density function of the laser beam, the light intensity based on huygens-fresnel law and the turbulence refractive index fluctuation energy spectrum are combined and converted to further obtain the mean square beam waist width of the gaussian beam, and the calculation formula of the mean square beam waist width is shown as formula (7) -formula (11), where formula (7) is:
the formula (8) is:
the formula (9) is:
the formula (10) is:
the formula (11) is:
wherein, A, B, C and D both represent process parameters, specifically as shown in formula (8) -formula (11), and N represents the number of Gaussian beams.
Alternatively, the emitting end may be a single row of laser emitting arrays.
Optionally, the laser cross-medium communication method further includes:
and determining the incidence relation between the vertical communication distance and the mean square beam waist width, wherein the vertical communication distance corresponds to the mean square beam waist width one to one.
Specifically, fig. 5 is a schematic diagram of an association relationship between a mean square beam waist width and a vertical communication distance provided by the present invention, and as shown in fig. 5, in order to test the transmission capability of a laser beam, the association relationship between the vertical communication distance and the mean square beam waist width is further determined, and under the condition of the same seawater parameter, the influence of a water environment in the cross-medium communication is further reduced through a mean square beam waist width value within a certain effective vertical communication distance, so that the remote communication of the laser beam can be realized.
Optionally, the vertical communication distance is a vertical distance from a z coordinate to an origin in the photon endpoint coordinate, and as shown in formula (5), an association relationship between the vertical communication distance and the mean square beam waist width may be obtained. In addition, the actual communication distance can be estimated under the condition that the vertical communication distance is not measurable by carrying out averaging processing on the mean square beam waist width range.
In addition, in the prior art, such as a sonar in a very low frequency as a main transmission technical scheme of cross-medium communication, the communication rate of the sonar in the cross-medium communication is only kb level and is lower, while the communication rate of the laser beam in the invention in the cross-medium communication can reach Mb level and the communication rate range can reach [50Mb, 200Mb ], compared with the prior art, the invention can realize the long-distance high-speed communication of the laser signal.
The laser cross-medium communication method provided by the invention has the advantages that through simulating the movement track of photons in a laser beam transmitted cross-medium, under the condition that the laser beam is subjected to atmospheric turbulence, water-gas interface sea waves and is subjected to optical refraction and reflection at a water-gas interface, the mean-square beam waist width range of the laser beam is determined, the mean-square beam waist width of the laser beam is determined based on the cross-medium transmission characteristics and the mean-square beam waist width range of the laser beam under the condition of seawater turbulence, and based on the mean-square beam waist width, the communication equipment parameters are further determined, the cross-medium influence of the laser beam in a water body environment is reduced, and further the cross-medium high-speed remote communication of the laser beam is realized.
The laser cross-medium communication device provided by the invention is described below, and the laser cross-medium communication device described below and the laser cross-medium communication method described above can be referred to correspondingly.
The present invention further provides a laser cross-medium communication device, fig. 6 is a schematic structural diagram of the laser cross-medium communication device provided by the present invention, and as shown in fig. 6, the laser cross-medium communication device 200 includes: a receiving module 201, a first determining module 202, and a second determining module 203, wherein:
a receiving module 201, configured to receive a laser beam sent by a transmitting end, where the laser beam performs cross-medium transmission;
the first determining module 202 is used for simulating the motion track of photons in the laser beam and determining the mean square beam waist width range of the laser beam;
and the second determining module 203 is used for determining the mean square beam waist width of the laser beam based on the cross-medium transmission characteristics of the laser beam and the mean square beam waist width range of the laser beam under the condition of seawater turbulence, wherein the mean square beam waist width is used for determining the communication equipment parameters of the laser beam to realize laser cross-medium communication.
According to the laser cross-medium communication device provided by the invention, through simulating the movement track of photons in a laser beam transmitted by a cross-medium, under the condition that the laser beam is subjected to atmospheric turbulence, water-gas interface sea waves and is subjected to optical refraction and reflection at a water-gas interface, the mean-square beam waist width range of the laser beam is determined, the mean-square beam waist width of the laser beam is determined based on the cross-medium transmission characteristics and the mean-square beam waist width range of the laser beam under the condition of seawater turbulence, and based on the mean-square beam waist width, the communication equipment parameters are further determined, the cross-medium influence of the laser beam in a water body environment is reduced, and further the cross-medium high-speed remote communication of the laser beam is realized.
Optionally, the first determining module 202 is specifically configured to:
determining a motion parameter for each photon in the laser beam;
determining an initial motion direction coordinate and an end point coordinate after motion limited time of each photon in the laser beam based on the motion parameter of each photon;
comparing the initial motion direction coordinate of each photon with the real number to determine the motion direction of each photon;
and comparing the terminal coordinate of each photon with the height threshold value under the condition that the movement direction of the photon faces to the water-gas interface, and determining the photon transmission success rate and the mean square beam waist width range of the laser beam.
Optionally, the first determining module 202 is specifically configured to:
if the initial motion direction coordinate of the photon belongs to a real number, the motion direction of the photon faces to a water-gas interface;
if the initial motion direction coordinate of the photon belongs to a negative number, the motion direction of the photon faces to the depth of the underwater medium.
Optionally, the first determining module 202 is specifically configured to:
under the condition that the motion direction of the photons faces to the water-gas interface, if the coordinate height of the endpoint of the photons is greater than a height threshold value, the photons are refracted across the medium;
if the coordinate height of the end point of the photon is less than or equal to the height threshold, the photon is internally reflected in the same medium;
iteratively comparing the coordinate height of the end point of each photon with a height threshold value to determine the number of received photons;
determining a photon transmission success rate of the laser beam based on the number of received photons;
based on the spot formed by the received photons, a mean square beam waist width range of the laser beam is determined.
Optionally, the second determining module 203 is specifically configured to:
determining the transmission parameters of the laser beams based on the cross-medium transmission characteristics of the laser beams and the mean square beam waist width range of the laser beams under the condition of seawater turbulence;
a mean-square beam waist width of the laser beam is determined based on the transmission parameters of the laser beam.
Optionally, the laser cross-medium communication device 200 further includes:
a third determining module 204, configured to determine an association relationship between a vertical communication distance and a mean square beam waist width, where the vertical communication distance corresponds to the mean square beam waist width one to one.
Fig. 7 illustrates a physical structure diagram of an electronic device, and as shown in fig. 7, the electronic device 300 may include: a processor (processor)310, a communication Interface (Communications Interface)320, a memory (memory)330 and a communication bus 340, wherein the processor 310, the communication Interface 320 and the memory 330 communicate with each other via the communication bus 340. Processor 310 may invoke logic instructions in memory 330 to perform a laser cross-media communication method comprising:
receiving a laser beam sent by a transmitting end, wherein the laser beam carries out cross-medium transmission;
simulating the motion track of photons in the laser beam, and determining the mean square beam waist width range of the laser beam;
and under the condition of seawater turbulence, determining the mean square beam waist width of the laser beam based on the cross-medium transmission characteristics of the laser beam and the mean square beam waist width range of the laser beam, wherein the mean square beam waist width is used for determining the communication equipment parameters of the laser beam to realize laser cross-medium communication.
In addition, the logic instructions in the memory 330 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute 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 removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, the computer program product includes a computer program, the computer program can be stored on a non-transitory computer readable storage medium, when the computer program is executed by a processor, the computer can execute the laser cross-medium communication method provided by the above methods, the method includes:
receiving a laser beam sent by a transmitting end, wherein the laser beam carries out cross-medium transmission;
simulating the motion track of photons in the laser beam, and determining the mean square beam waist width range of the laser beam;
under the condition of seawater turbulence, the mean square beam waist width of the laser beam is determined based on the cross-medium transmission characteristics of the laser beam and the mean square beam waist width range of the laser beam, wherein the mean square beam waist width is used for determining communication equipment parameters of the laser beam, and laser cross-medium communication is realized.
In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a laser cross-medium communication method provided by the above methods, the method comprising:
receiving a laser beam sent by a transmitting end, wherein the laser beam carries out cross-medium transmission;
simulating the motion track of photons in the laser beam, and determining the mean square beam waist width range of the laser beam;
under the condition of seawater turbulence, the mean square beam waist width of the laser beam is determined based on the cross-medium transmission characteristics of the laser beam and the mean square beam waist width range of the laser beam, wherein the mean square beam waist width is used for determining communication equipment parameters of the laser beam, and laser cross-medium communication is realized.
The above-described embodiments of the apparatus are merely illustrative, and units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. Based on the understanding, the above technical solutions substantially or otherwise contributing to the prior art may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method of various embodiments or some parts of embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A laser cross-medium communication method, comprising:
receiving a laser beam sent by a transmitting end, wherein the laser beam carries out cross-medium transmission;
simulating the motion trail of photons in the laser beam and determining the mean square beam waist width range of the laser beam;
under the condition of seawater turbulence, determining the mean square beam waist width of the laser beam based on the cross-medium transmission characteristics of the laser beam and the mean square beam waist width range of the laser beam, wherein the mean square beam waist width is used for determining communication equipment parameters of the laser beam to realize laser cross-medium communication;
the method comprises the following steps of under the condition of seawater turbulence, determining the mean square beam waist width of the laser beam based on the cross-medium transmission characteristics of the laser beam and the mean square beam waist width range of the laser beam, wherein the mean square beam waist width is used for determining communication equipment parameters of the laser beam, and realizing laser cross-medium communication, and comprises the following steps:
determining a transmission parameter of the laser beam based on the cross-medium transmission characteristic of the laser beam and the mean square beam waist width range of the laser beam under the condition of seawater turbulence;
determining a mean-square beam waist width of the laser beam based on the transmission parameters of the laser beam;
wherein, the transmission parameters of the laser beam comprise a cross spectral density function, a light intensity based on the Huygens-Fresnel law and a turbulent refractive index fluctuation energy spectrum; the mean square beam waist width calculation formula is as follows:
wherein the content of the first and second substances,
，
where A, B, C and D both represent process parameters, N represents the number of laser beams,
the beam waist width of the single beam non-paraxial laser beam at the initial distance is represented, the initial distance is calculated when the light source center is used as the origin, and the z-axis coordinate value of the photon transmission coordinate towards the vertical upper side is 0,
the distance between two adjacent laser beams is shown,
and
respectively representing the number of intervals between two randomly selected laser beams in the array laser beam and the origin,
a beam representing a light wave, z represents a z-axis coordinate value transmitting a coordinate vertically upward with a center of the light source as an origin,
which is indicative of the refractive index of the turbulent flow,
showing the turbulent refractive index fluctuation spectrum.
2. The laser cross-medium communication method of claim 1, wherein the simulating the motion trajectory of photons in the laser beam and determining a mean-square beam waist width range of the laser beam comprises:
determining a motion parameter for each photon in the laser beam;
determining the initial motion direction coordinate and the terminal coordinate after the motion limited time of each photon in the laser beam based on the motion parameter of each photon;
comparing the initial motion direction coordinate of each photon with the real number to determine the motion direction of each photon;
and comparing the terminal point coordinate of each photon with the height threshold value under the condition that the motion direction of the photon faces to the water-gas interface, and determining the photon transmission success rate and the mean square beam waist width range of the laser beam.
3. The laser cross-medium communication method according to claim 2, wherein the comparing the initial motion direction coordinates of each photon with real numbers to determine the motion direction of each photon comprises:
if the initial motion direction coordinate of the photon belongs to a real number, the motion direction of the photon faces to a water-gas interface;
and if the initial motion direction coordinate of the photon belongs to a negative number, the motion direction of the photon faces to the depth of the underwater medium.
4. The laser cross-medium communication method according to claim 2, wherein the step of comparing the end point coordinate of each photon with the height threshold value to determine the photon transmission success rate and the mean square beam waist width range of the laser beam when the movement direction of the photon is toward the water-gas interface comprises the steps of:
under the condition that the motion direction of the photon faces to a water-gas interface, if the coordinate height of the endpoint of the photon is greater than a height threshold value, the photon is refracted across media;
if the coordinate height of the end point of the photon is less than or equal to the height threshold, the photon is internally reflected in the same medium;
iteratively comparing the coordinate height of the end point of each photon with a height threshold value to determine the number of received photons;
determining a photon transmission success rate of the laser beam based on the received photon number;
based on the spot formed by the received photons, a mean square beam waist width range of the laser beam is determined.
5. The laser cross-medium communication method according to any one of claims 1 to 4, further comprising:
and determining the incidence relation between the vertical communication distance and the mean square beam waist width, wherein the vertical communication distance corresponds to the mean square beam waist width one to one.
6. A laser cross-media communication device, comprising:
the receiving module is used for receiving the laser beam sent by the transmitting end, and the laser beam carries out cross-medium transmission;
the first determining module is used for simulating the motion trail of photons in the laser beam and determining the mean square beam waist width range of the laser beam;
the second determination module is used for determining the mean square beam waist width of the laser beam based on the cross-medium transmission characteristics of the laser beam and the mean square beam waist width range of the laser beam under the condition of seawater turbulence, wherein the mean square beam waist width is used for determining communication equipment parameters of the laser beam to realize laser cross-medium communication;
the second determining module is specifically configured to:
determining a transmission parameter of the laser beam based on the cross-medium transmission characteristic of the laser beam and the mean square beam waist width range of the laser beam under the condition of seawater turbulence;
determining a mean-square beam waist width of the laser beam based on the transmission parameters of the laser beam;
the transmission parameters of the laser beam comprise a cross spectral density function, a light intensity based on Huygens-Fresnel law and a turbulent refractive index fluctuation energy spectrum; the mean square beam waist width calculation formula is as follows:
wherein the content of the first and second substances,
，
where A, B, C and D both represent process parameters, N represents the number of laser beams,
the beam waist width of the single beam non-paraxial laser beam at the initial distance is represented, the initial distance is calculated when the light source center is used as the origin, and the z-axis coordinate value of the photon transmission coordinate towards the vertical upper side is 0,
the distance between two adjacent laser beams is shown,
and
respectively representing the number of intervals between two randomly selected laser beams in the array laser beam and the origin,
a beam representing a light wave, z represents a z-axis coordinate value transmitting a coordinate vertically upward with a center of the light source as an origin,
which is indicative of the refractive index of the turbulent flow,
showing the turbulent refractive index fluctuation spectrum.
7. The laser cross-media communication device of claim 6, further comprising:
and the third determining module is used for determining the incidence relation between the vertical communication distance and the mean square beam waist width, wherein the vertical communication distance corresponds to the mean square beam waist width one to one.
8. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the laser cross-media communication method according to any one of claims 1 to 5 when executing the program.
9. A non-transitory computer readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the laser cross-media communication method according to any one of claims 1 to 5.
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| US9503182B2 (en) * | 2014-08-20 | 2016-11-22 | Raytheon Company | Apparatus and method for reducing signal fading due to atmospheric turbulence |
| US11815625B2 (en) * | 2020-05-26 | 2023-11-14 | China University Of Geosciences, Wuhan | Methods and devices for correcting underwater photon displacement and for depth sounding with single-photon Lidar |
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| WO1991005269A1 (en) * | 1989-09-27 | 1991-04-18 | Neuronics Pty. Ltd. | Laser radar system for the detection of clear air turbulence |
| CN108023652A (en) * | 2017-10-27 | 2018-05-11 | 西安邮电大学 | A kind of analogy method of laser transmission characteristic applied to seawater channel |
| CN108900245A (en) * | 2018-06-26 | 2018-11-27 | 中国地质大学（武汉） | The emulation mode and system of Bessel-Gaussian beam transmission characteristic in turbulent atmosphere |
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