CN115333626B - Laser beam identification method, terminal and storage medium for space optical communication - Google Patents
Laser beam identification method, terminal and storage medium for space optical communication Download PDFInfo
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Abstract
The invention discloses a laser beam identification method, a terminal and a storage medium of a space optical communication system, wherein the speckle number of laser speckles formed on the surface of a detector by each laser beam received by a laser receiving end is determined; the laser beam is generated by modulating the laser coherence degree by a laser emitting end according to a preset modulation factor; determining a predicted modulation factor of the laser beam based on the speckle number of the laser beam; then determining a laser sending end corresponding to the laser beam according to the predicted modulation factor and a preset modulation factor set; the preset modulation factor set is composed of preset modulation factors of all laser emission ends in the space optical communication system, and the preset modulation factors of all the laser emission ends are different from each other. Through the scheme, simple and efficient effective recognition of the multi-source laser beam can be realized.
Description
Technical Field
The present invention relates to the field of optical communication technologies, and in particular, to a laser beam identification method, a terminal, and a storage medium for spatial optical communication.
Background
With the development of communication and aerospace technologies, a ground communication network and a satellite communication network are fused to form an air-space-earth-sea integrated network. Therefore, a multidirectional reliable inter-satellite link is established by adopting a space optical communication technology to form a space optical communication large-scale networking system based on laser communication, and the space optical communication large-scale networking system becomes a development trend of an air-space-ground-sea integrated network. In the space optical communication networking system, each satellite node can simultaneously communicate with a plurality of other satellite nodes through laser beams, and a plurality of communication links are established and maintained. Since each satellite node is constructed with multiple communication links, each satellite node typically needs to transmit and receive multiple sets of laser beams simultaneously. Therefore, in the space optical communication networking system, the received laser beam needs to be effectively identified, and the source of the received laser beam is determined, so that the information carried in the laser beam is effectively identified.
In the prior art, the source of the received laser beam is often identified through multiple dimensions such as intensity, phase and orbital angular momentum, the intensity information is relatively simple to obtain, but the difficulty in obtaining the phase and orbital angular momentum is relatively high, and the intensity needs to be effectively distinguished on the wavelength, so that the difficulty in identifying the source of the laser beam is high.
Therefore, how to provide a technical scheme capable of simply and efficiently identifying the source of the laser beam is a technical problem which needs to be solved urgently.
Disclosure of Invention
The invention mainly aims to provide a laser beam identification method, a terminal and a computer readable storage medium of a space optical communication system, and aims to solve the problem that multi-source laser beam identification is difficult in the prior art.
In order to achieve the above object, an embodiment of the present invention provides a laser beam identification method for a space optical communication system, where the method includes:
determining the number of speckles of laser speckles formed on the surface of a detector by each laser beam received by a laser receiving end; the laser beam is generated by modulating the laser coherence degree by a laser emitting end according to a preset modulation factor;
determining a predicted modulation factor of the laser beam based on the number of speckles of the laser beam;
determining a laser sending end corresponding to the laser beam according to the predicted modulation factor and a preset modulation factor set;
the preset modulation factor set is composed of preset modulation factors of all laser transmitting ends in the space optical communication system, and the preset modulation factors of all the laser transmitting ends are different from each other.
Optionally, the determining the number of speckles of laser speckles formed on the surface of the detector by each laser beam received by the laser receiving end specifically includes:
determining an incidence space area of each laser beam, and determining a corresponding detection area according to the incidence space area;
the incident space area is obtained by spatially dividing the receiving light path space of the laser receiving end, and the incident space areas of the laser beams are different from each other; the detection area is obtained by carrying out area division on the surface of the detector, and the detection areas of the laser beams are different from each other;
and acquiring the number of speckles of the laser speckles in the detection area as the number of the speckles of the laser speckles formed on the surface of the detector by the laser beam.
Optionally, the acquiring the number of speckles of the laser speckle in the detection area specifically includes:
acquiring a speckle pattern of the surface of the detector;
determining a speckle area corresponding to the laser beam in the speckle pattern according to a detection area corresponding to an incident space area of the laser beam;
and determining the number of speckles corresponding to the laser beam in the speckle area corresponding to the laser beam based on an area generation algorithm.
Optionally, the laser beam is split by a splitter at a laser receiving end to obtain a first split beam, and the first split beam is incident on the surface of the detector to form laser speckles, which are formed on the surface of the detector by the laser beam.
Optionally, the determining a predicted modulation factor of the laser beam based on the number of speckles of the laser beam specifically includes:
determining the light source linearity, beam waist radius and laser transmission distance of the laser beam;
and determining the predicted modulation factor of the laser beam according to the speckle number of the laser beam, the light source linearity, the beam waist radius and the laser transmission distance of the laser beam.
Optionally, the determining, according to the predicted modulation factor and a preset modulation factor set, a laser transmitting end corresponding to the laser beam specifically includes:
determining a preset modulation factor matched with the predicted modulation factor in the preset modulation factor set as a target modulation factor;
and determining the laser emitting end corresponding to the target modulation factor according to the mapping relation between the preset modulation factor and the laser emitting end.
Optionally, the determining, according to the predicted modulation factor and a preset modulation factor set, a laser transmitting end corresponding to the laser beam specifically includes:
determining the optical fiber coupling power of the laser beam according to the fact that the optical fiber coupling system of the laser receiving end receives the second split light beam;
the second split light beam is obtained by splitting the laser beam through a splitter of the laser receiving end;
determining a verification modulation factor corresponding to the laser beam according to the optical fiber coupling power;
and under the condition that the verification modulation factor is matched with the prediction modulation factor, determining a laser sending end corresponding to the laser beam according to the prediction modulation factor or the verification modulation factor and a preset modulation factor set.
Optionally, after determining the verification modulation factor corresponding to the laser beam according to the fiber coupling power, the method further includes:
and under the condition that the verification modulation factor is not matched with the prediction modulation factor, determining a laser emitting end corresponding to the laser beam according to the verification modulation factor and the preset modulation factor set.
Optionally, after determining the verification modulation factor corresponding to the laser beam according to the fiber coupling power, the method further includes:
and adjusting the incident angle of the optical splitter under the condition that the verification modulation factor is not matched with the prediction modulation factor.
Optionally, after determining the laser transmitting end corresponding to the laser beam according to the predicted modulation factor and a preset modulation factor set, the method further includes:
recording the number of the predicted modulation factors matched with the verification modulation factors as an accurate number within a preset time; and recording the determined number of predicted modulation factors as a total number;
determining the identification probability of the coherence information according to the accurate number and the total number;
and under the condition that the identification probability of the coherence information is greater than a preset threshold value, rejecting an optical fiber coupling system of the laser receiving end.
Optionally, the second split beam is a laser transmitted beam or a laser reflected beam.
In order to achieve the above object, an embodiment of the present invention further provides a terminal, where the terminal includes: a processor and a memory; the memory has stored thereon a computer readable program executable by the processor; the processor, when executing the computer readable program, implements the steps in the laser beam identification method of the space optical communication system as described in any one of the above.
In addition, to achieve the above object, an embodiment of the present invention further provides a computer-readable storage medium, which stores one or more programs, where the one or more programs are executable by one or more controllers to implement the steps in the laser beam identification method of the spatial light communication system according to any one of the above items.
According to the embodiment of the invention, the speckle number of the laser speckles formed on the surface of the detector at the laser receiving end by each laser beam is directly inverted to obtain the corresponding predictive modulation factor of the laser beam. The laser beams are generated after the laser emitting ends carry out coherence modulation according to the preset modulation factors, and the preset modulation factors of the laser emitting ends are different, so that the coherence of the laser beams is different. The predicted modulation factor inverted according to the number of speckles of the laser beam is compared with the preset modulation factor, so that the laser emitting end corresponding to the laser beam can be determined, the parameters such as phase and orbital angular momentum with high acquisition difficulty do not need to be acquired, and the simple and efficient identification of the multi-source laser beam is realized.
Drawings
Fig. 1 is a schematic structural diagram of a laser receiving end in a space optical communication system according to an embodiment of the present invention;
fig. 2 is a flowchart of a laser beam identification method of a space optical communication system according to an embodiment of the present invention;
fig. 3 is a flowchart of step S201 according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a detector surface partition provided in an embodiment of the present invention;
fig. 5 is a flowchart of step S302 according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The space optical communication system is formed by a plurality of satellite nodes in a communication mode, each satellite node is provided with at least one laser receiving end and at least one laser transmitting end, each satellite node can communicate with other satellite nodes, and the laser receiving end of each satellite node needs to receive laser beams which are from the laser transmitting ends and load information in a plurality of directions and in a plurality of dimensions in a modulation mode. In the point-to-point and end-to-end laser communication process, laser beams are received at a laser receiving end through an optical antenna and a beam shrinking light path, and enter a detector to start sampling processing after being amplified by a low-noise photoelectric signal amplifying circuit. And for each satellite node in the space optical communication system, a plurality of laser beams can be received simultaneously, and the detector cannot effectively distinguish the laser beams, so that the normality among the satellite nodes is influenced.
In the prior art, multi-source laser beams are usually identified from multiple dimensions such as intensity, phase and orbital angular momentum, but intensity information is identified simply through a detector, but the identification of the two dimensions such as the phase and the orbital angular momentum is difficult, so that the difficulty in identifying and distinguishing the multi-source laser beams is high.
Based on this, embodiments of the present invention provide a laser beam identification method, a terminal, and a device for a space optical communication system, so as to provide a simple and efficient technical solution to effectively identify a received multi-source laser beam.
Fig. 1 is a schematic structural diagram of a laser receiving end according to an embodiment of the present invention. As shown in fig. 1, the laser receiving end may include at least: a splitter 100, a detector 110, and a fiber coupling system 120. Wherein the fiber coupling system at least comprises: the optical fiber comprises at least one lens 121 and at least one single-mode optical fiber 122, wherein the lens 121 corresponds to the single-mode optical fiber 122 one to one.
In the laser receiving end provided in the embodiment of the present invention, the received laser beam is split by the beam splitter 100. As shown in fig. 1, the split laser reflected beam enters the detector 110, and the split laser projected beam enters the fiber coupling system 120, i.e. enters the single mode fiber 122 through the corresponding lens 121.
It can be understood that the positions of the detector 110 and the optical fiber coupling system 120 may be changed for the laser receiving end provided in the embodiment of the present invention, that is, the split laser reflected beam enters the optical fiber coupling system 120, and the split laser transmitted beam enters the detector 110, which is not specifically limited in the embodiment of the present invention.
Based on the laser receiving end provided by the above embodiment, an embodiment of the present invention provides a laser beam identification method for a space optical communication system, and as shown in fig. 2, the laser beam identification method provided by the embodiment of the present invention at least includes the following steps:
s201, determining the number of speckles of laser speckles formed on the surface of a detector by each laser beam received by a laser receiving end.
The laser beam is generated by laser transmitting ends through laser coherence modulation according to preset modulation factors, and the preset modulation factors of the laser transmitting ends are different from each other. That is, the laser beams emitted from different laser emitting ends have different degrees of coherence.
According to the laser receiving end provided by the above embodiment, the first split beam obtained by splitting the laser beam by the splitter of the laser receiving end is incident on the surface of the detector to form an image, and the formed laser speckle, that is, the laser speckle formed by the laser beam on the surface of the detector 110, is formed. The first split beam may be a laser-transmitted beam of the laser beam or a laser-reflected beam of the laser beam, and varies according to the positions of the detector 110 and the beam splitter 100.
Specifically, the laser emitting end emits a laser beam obtained by modulating the laser coherence degree by a preset modulation factor to the laser receiving end. Laser beams enter the optical splitter through a receiving optical path space and a front optical path system of the laser receiving end, the optical splitter splits the received laser beams, the first split optical beams after splitting are incident to the detector, and the second split optical beams are incident to the optical fiber coupling system.
It is to be understood that, in the case where the first split light beam is a laser reflected light beam, the second split light beam is a laser transmitted light beam; in the case where the first split light beam is a laser transmitted light beam, the second split light beam is a laser reflected light beam.
The receiving optical path space is an area space for receiving the laser beam at the laser receiving end, and the front optical path system is an optical path through which the laser beam passes before entering the beam splitter at the laser receiving end.
Fig. 3 is a flowchart of step S201 according to an embodiment of the present invention, and as shown in fig. 3, step S201 can be implemented by at least the following steps:
s301, determining the incident space area of each laser beam, and determining the corresponding detection area according to the incident space area.
The incident space area is obtained by spatially dividing the receiving light path space of the laser receiving end, and the incident space areas of the laser beams are different from each other. The detection area is obtained by dividing the surface of the detector into areas, and the detection areas of the laser beams are different from each other. As shown in fig. 1, the laser beam M1 and the laser beam M2 enter the beam splitter 100 through different incident spatial regions, the laser beam M1 corresponds to the detection region B, and the laser beam M2 corresponds to the detection region a.
Since the laser receiving end may receive a plurality of laser beams at the same time, the receiving optical path space of the laser receiving end is spatially divided into a plurality of incident spatial regions and allocated to the corresponding laser beams. That is to say, each laser beam has a corresponding incident spatial region, the laser beam enters the beam splitter at the laser receiving end from the corresponding incident spatial region, the laser beam passes through the beam splitter, and the first split beam entering the detector forms laser speckles in the region corresponding to the detector. Therefore, the detector surface can be divided into different detection regions (as shown in fig. 4, the detector surface is divided into A, B, C, D four detection regions) in advance according to the divided incident space regions, and each detection region corresponds to one incident space region.
S302, acquiring the number of speckles of the laser speckles in the detection area as the number of the speckles of the laser speckles formed on the surface of the detector by the laser beam.
In the embodiment of the invention, each laser beam has a unique corresponding detection area, so that laser speckles in the detection areas are the laser speckles formed on the surface of the detector by the laser beams.
Through steps S301-S302, the number of speckles formed on the surface of the detector by different laser beams can be accurately obtained, so that the generation of noise is avoided, and the subsequent predicted modulation factor of the laser beam determined based on the number of speckles is influenced.
Fig. 5 is a flowchart of step S302 according to an embodiment of the present invention, and as shown in fig. 5, step S302 can be implemented by at least the following steps:
s501, obtaining a laser speckle pattern on the surface of the detector.
In an embodiment of the invention, an image of the detector surface may be acquired and used as a laser speckle pattern.
S502, determining a speckle area corresponding to the laser beam in the laser speckle pattern according to a detection area corresponding to the incident space area of the laser beam.
The detection area corresponding to the laser beam can be determined through the step S301, and then the speckle area corresponding to the laser beam in the laser speckle pattern can be determined according to the detection area. Specifically, the speckle area corresponding to the detection area can be obtained by mapping in the laser speckle pattern according to the position information of the detection area on the surface of the detector.
S503, determining the number of speckles corresponding to the laser beam in the speckle area corresponding to the laser beam based on the area growing algorithm.
In the embodiment of the invention, the speckle area of the laser beam can be divided from the laser speckle pattern, and the binarization processing is carried out on the speckle area of the laser beam to obtain the binarized speckle area. And then determining the number of speckles in the binarized speckle area based on an area growing algorithm.
It can be understood that the speckle number corresponding to the laser beam can also be determined by processing the speckle area corresponding to the laser beam by other existing methods, which are not specifically limited in the embodiment of the present invention, for example, directly performing binarization processing on the laser speckle pattern, determining the laser speckles in the laser speckle pattern by using an area growing algorithm on the binarized laser speckle pattern, and then determining the speckle number corresponding to the laser beam according to the speckle area of the laser beam.
In the laser beam identification method of the space optical communication system provided by the embodiment of the invention, an execution main body of the method can be a device such as a processor, and the processor can be arranged in the satellite node and used for data processing and data acquisition.
S202, determining a predicted modulation factor of the laser beam based on the speckle number of the laser beam.
Specifically, the light source linearity, beam waist radius and laser transmission distance of a laser beam are determined; then, according to the number of speckles of the laser beam, the light source linearity, the beam waist radius and the laser transmission distance of the laser beam, determining a predicted modulation factor of the laser beam, as shown in the following formula:
wherein:
wherein the content of the first and second substances,
is the number of speckles of the laser beam,
in order to predict the modulation factor(s),
is the source linearity of the laser beam,
is the beam waist radius of the laser beam,
the laser transmission distance of the laser beam (i.e. the transmission distance from the laser emitting end to the laser receiving end),
is the diameter of the incident spatial region.
And S203, determining a laser sending end corresponding to the laser beam according to the predicted modulation factor and the preset modulation factor set.
The preset modulation factor set consists of preset modulation factors of all laser emission ends in the space optical communication system.
The laser emitting end of each satellite node in the space optical communication system is provided with a corresponding preset modulation factor, and the preset modulation factors of the laser emitting ends are different. Therefore, in the embodiment of the present invention, a unique identifier may be set in advance for each laser transmitting end in the space optical communication system, a corresponding mapping table is generated according to the unique identifier of the laser transmitting end and the preset modulation factor of the laser transmitting end, and the laser transmitting end uniquely corresponding to the preset modulation factor can be found through the mapping table, so that the satellite node where the laser transmitting end is located can be determined.
Specifically, in a preset modulation factor set, a preset modulation factor matched with the predicted modulation factor is determined as a target modulation factor; and then determining a laser emitting end corresponding to the target modulation factor as a laser emitting end corresponding to the laser beam according to the mapping relation between the preset modulation factor and the laser emitting end, and further determining a satellite node corresponding to the laser beam according to the laser emitting end.
It should be noted that, in the embodiment of the present invention, matching the predicted modulation factor with the preset modulation factor may mean that the predicted modulation factor is equal to the preset modulation factor within an error allowable range.
The embodiment of the invention provides a laser beam identification method of a space optical communication system, which determines a predictive modulation factor of a received laser beam through the number of speckles formed on the surface of a detector of a laser receiving end by the laser beam; because the laser beam is obtained by the laser emitting end after the coherence modulation is carried out according to the preset modulation factor, and the preset modulation factors of the laser emitting ends are different, the laser emitting end corresponding to the laser beam can be determined through the prediction modulation factor and the preset modulation factor set of the laser beam determined based on the speckle number. That is to say, according to the laser beam identification method of the space optical communication system provided by the embodiment of the invention, the number of speckles of laser speckles formed on the surface of the detector by the laser beam is directly inverted into the corresponding prediction modulation factor, the corresponding laser emitting end can be determined by predicting the modulation factor, the source of the multi-source laser beam does not need to be identified according to the phase and orbital angular momentum with high acquisition difficulty, and the identification of the multi-source laser beam is simply and efficiently realized.
Fig. 5 is a flowchart of step S203 according to an embodiment of the present invention, and as shown in fig. 5, step S203 can be implemented by at least the following steps:
s501, determining the optical fiber coupling power of the laser beam according to the second split light beam received by the optical fiber coupling system of the laser receiving end.
And S502, determining a verification modulation factor corresponding to the laser beam according to the optical fiber coupling power.
In an actual optical communication process, the light beam emitted by the transmitting antenna is not ideally completely coherent light, but exists in the form of partially coherent light and behaves as a gaussian-schell model. The cross spectral density function of a random light field generated by a gaussian-scherrer model light source with gaussian-shaped light intensity distribution and coherence distribution at a transmitting antenna can be expressed as:
wherein the content of the first and second substances,
is a constant value, and is characterized in that,
is the distance vector between any point on the receiving surface and the central point,
is the beam waist radius of the laser beam,
is the source linearity of the laser beam.
The fiber coupling efficiency, which is the ratio of the incident signal optical frequency to the optical power in the plane of the receiving aperture, can be expressed as:
wherein the content of the first and second substances,
the coupling efficiency of the optical fiber;
is the incident signal optical power;
receiving the in-plane optical power of the aperture;
as a vector of the position on the receiving aperture plane from the center of the receiving optical axis
An incident light field of (a);
is a complex conjugate light field transmitted reversely to pupil plane and satisfying normalization condition
。
The fiber coupling efficiency can be calculated at the receiving aperture and at the fiber end face, and the calculation is simpler when the receiving aperture is selected, so that the formula can be obtained:
wherein the content of the first and second substances,
as a mutual coherence function of the incident light field, it can be expressed as:
wherein the content of the first and second substances,
、 
、
all are obtained by the cross-spectral density function of formula (1).
Substituting the formula (1) into the formula (4) can be simplified to obtain:
wherein the content of the first and second substances,
are coherence modulation parameters.
Substituting equation (5) into equation (3) yields:
wherein, the first and the second end of the pipe are connected with each other,
is the diameter of the region of the incident space,
in order to be a function of the Bessel function,
is the predicted modulation factor of the laser beam,
is the number of the imaginary numbers,
in terms of the wave number, the number of waves,
is a function.
And the number of the first and second electrodes,
。
the integral of equation (6) can be sorted out:
definition of
For normalizing the radial integral variables, respectively
，
Equation (7) can be collated:
in the embodiment of the invention, the mapping relation between the optical fiber coupling power and the verification adjustment factor is preset and stored, so that the verification modulation factor corresponding to the laser beam can be determined according to the mapping relation between the optical fiber coupling power and the verification adjustment factor.
S503, confirming whether the verified modulation factor of the laser beam is matched with the corresponding predicted modulation factor.
It should be noted that, in the embodiment of the present invention, the verification modulation factor is equal to the predicted modulation factor within the error tolerance range, which means that the verification modulation factor matches the corresponding predicted modulation factor.
And S504, under the condition that the verification modulation factor of the laser beam is matched with the prediction modulation factor, determining a laser sending end corresponding to the laser beam according to the prediction modulation factor or the verification modulation factor and a preset modulation factor set.
When the verification modulation factor is matched with the prediction modulation factor, the verification modulation factor is equal to the prediction modulation factor within the error allowable range, and the laser transmitting end corresponding to the laser beam can be determined through the prediction modulation factor or the verification modulation factor and a preset modulation factor set.
And S505, under the condition that the verified modulation factor of the laser beam is not matched with the predicted modulation factor, determining a laser sending end corresponding to the laser beam according to the verified modulation factor and a preset modulation factor set.
When the modulation factor is verified to be not matched with the predicted modulation factor, the fact that a certain error exists in the predicted modulation factor determined based on the speckle number of the laser beam is shown, and the laser sending end corresponding to the laser beam is determined through verifying the modulation factor.
And determining the optical fiber coupling power of the laser beam through the second split beam of the laser beam received by the light coupling system of the laser receiving end, thereby determining a corresponding verification adjustment factor according to the optical fiber coupling power, and verifying the predicted modulation factor by using the verification adjustment factor as verification information so as to ensure the accuracy of the laser transmitting end corresponding to the determined laser beam.
In some embodiments of the present invention, the incident angle of the beam splitter is adjusted in the event that the verified modulation factor of the laser beam does not match the predicted modulation factor.
In the embodiment of the invention, if the verified modulation factor of the laser beam is not matched with the predicted modulation factor, the error of the predicted modulation factor is larger, and the beam splitter needs to be adjusted, so that the accuracy of multi-source laser beam identification is further improved.
In some embodiments of the present invention, the number of predicted modulation factors matching the verified modulation factor is recorded as an accurate number within a preset time; recording the number of the predicted modulation factors in the preset time as the total number; determining the identification probability of the coherence information according to the accurate number and the total number; and under the condition that the identification probability of the coherence information is greater than a preset threshold value, removing an optical fiber coupling system at a laser receiving end.
In the embodiment of the invention, the coherence information identification probability obtained by the scheme can represent the accuracy of the predicted modulation factor determined based on the number of speckles in the preset time, and the accuracy of the predicted modulation factor determined based on the number of speckles is high under the condition that the coherence information identification probability is greater than the preset threshold, so that an optical fiber coupling system at a laser receiving end can be eliminated, and the resource cost is saved under the condition that the multi-source laser beam identification rate is ensured.
Based on the laser beam identification method of the space optical communication, the embodiment of the invention further provides a terminal, as shown in fig. 6, which includes at least one processor (processor) 60; a display screen 61; and a memory (memory) 62, and may further include a communication Interface (Communications Interface) 63 and a bus 64. The processor 60, the display 61, the memory 62 and the communication interface 63 can communicate with each other through a bus 64. The display screen 61 is configured to display a user guidance interface preset in the initial setting mode. Communication interface 63 may communicate information. The processor 60 may invoke logic instructions in the memory 62 to perform the steps in the laser beam identification method of the space optical communication system provided by the above-described embodiments.
Furthermore, the logic instructions in the memory 62 may be implemented in the form of software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product.
The memory 62, which is a computer-readable storage medium, may be configured to store software programs, computer-executable programs, such as program instructions or modules corresponding to the methods in the embodiments of the present disclosure. The processor 60 executes the functional application and data processing, i.e. implements the method in the above-described embodiments, by executing the software program, instructions or modules stored in the memory 62.
The memory 62 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 62 may include high speed random access memory and may also include non-volatile memory. For example, a variety of media that can store program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, may also be transient storage media.
Based on the laser beam identification method of the spatial light system, an embodiment of the present invention further provides a computer-readable storage medium, where one or more programs are stored in the computer-readable storage medium, and the one or more programs are executable by one or more processors to implement the steps in the laser beam identification method of the spatial light system according to the above embodiment.
In addition, the specific processes loaded and executed by the instruction processors in the storage medium and the terminal are described in detail in the method, and are not stated herein.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
Of course, it will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by instructing relevant hardware (such as a processor, a controller, etc.) through a computer program, and the program can be stored in a computer readable storage medium, and when executed, the program can include the processes of the embodiments of the methods described above. The computer readable storage medium may be a memory, a magnetic disk, an optical disk, etc.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (13)
1. A method for identifying a laser beam in a space optical communication system, the method comprising:
determining the number of speckles of laser speckles formed on the surface of a detector by each laser beam received by a laser receiving end; the laser beam is generated by modulating the laser coherence degree by a laser emitting end according to a preset modulation factor;
determining a predicted modulation factor of the laser beam based on the number of speckles of the laser beam;
determining a laser sending end corresponding to the laser beam according to the predicted modulation factor and a preset modulation factor set;
the preset modulation factor set is composed of preset modulation factors of all laser transmitting ends in the space optical communication system, and the preset modulation factors of all the laser transmitting ends are different from each other.
2. The method according to claim 1, wherein the determining the number of speckles of the laser speckle formed on the surface of the detector by each laser beam received by the laser receiving end specifically comprises:
determining an incidence space area of each laser beam, and determining a corresponding detection area according to the incidence space area;
the incident space area is obtained by spatially dividing the receiving light path space of the laser receiving end, and the incident space areas of the laser beams are different from each other; the detection area is obtained by carrying out area division on the surface of the detector, and the detection areas of the laser beams are different from each other;
and acquiring the number of speckles of the laser speckles in the detection area as the number of the speckles of the laser speckles formed on the surface of the detector by the laser beam.
3. The method according to claim 2, wherein the obtaining the number of speckles of the laser speckle in the detection area specifically comprises:
acquiring a speckle pattern of the surface of the detector;
determining a speckle area corresponding to the laser beam in the speckle pattern according to a detection area corresponding to an incident space area of the laser beam;
and determining the number of speckles corresponding to the laser beam in the speckle area corresponding to the laser beam based on an area generation algorithm.
4. The method according to claim 1, wherein the laser beam is split by a splitter at a laser receiving end to obtain a first split beam, and the first split beam is incident on the surface of the detector to form laser speckles, which are formed on the surface of the detector by the laser beam.
5. The method according to claim 1, wherein determining the predicted modulation factor of the laser beam based on the number of speckles of the laser beam comprises:
determining the light source linearity, beam waist radius and laser transmission distance of the laser beam;
and determining a predicted modulation factor of the laser beam according to the speckle number of the laser beam, the light source linearity of the laser beam, the beam waist radius and the laser transmission distance.
6. The method according to claim 1, wherein the determining, according to the predicted modulation factor and a preset modulation factor set, a laser transmitting end corresponding to the laser beam specifically includes:
determining a preset modulation factor matched with the predicted modulation factor in the preset modulation factor set as a target modulation factor;
and determining the laser emitting end corresponding to the target modulation factor according to the mapping relation between the preset modulation factor and the laser emitting end.
7. The method according to claim 1, wherein the determining, according to the predicted modulation factor and a preset modulation factor set, a laser transmitting end corresponding to the laser beam specifically includes:
determining the optical fiber coupling power of the laser beam according to the fact that the optical fiber coupling system of the laser receiving end receives the second split light beam;
the second split light beam is obtained by splitting the laser beam through a splitter of the laser receiving end;
determining a verification modulation factor corresponding to the laser beam according to the optical fiber coupling power;
and under the condition that the verification modulation factor is matched with the prediction modulation factor, determining a laser sending end corresponding to the laser beam according to the prediction modulation factor or the verification modulation factor and a preset modulation factor set.
8. The method of claim 7, wherein after determining the verification modulation factor corresponding to the laser beam based on the fiber coupling power, the method further comprises:
and under the condition that the verification modulation factor is not matched with the prediction modulation factor, determining a laser emitting end corresponding to the laser beam according to the verification modulation factor and the preset modulation factor set.
9. The method of claim 8, wherein after determining the verification modulation factor corresponding to the laser beam based on the fiber coupling power, the method further comprises:
and adjusting the incident angle of the optical splitter under the condition that the verification modulation factor is not matched with the prediction modulation factor.
10. The method of claim 7, wherein after determining the laser transmitting end corresponding to the laser beam according to the predicted modulation factor and a preset modulation factor set, the method further comprises:
recording the number of the predicted modulation factors matched with the verification modulation factors as an accurate number within a preset time; and recording the determined number of predicted modulation factors as a total number;
determining the identification probability of the coherence information according to the accurate number and the total number;
and under the condition that the identification probability of the coherence information is greater than a preset threshold value, removing an optical fiber coupling system at the laser receiving end.
11. The method of claim 7, wherein the second split beam is a laser transmitted beam or a laser reflected beam.
12. A terminal, characterized in that the terminal comprises: a processor and a memory; the memory has stored thereon a computer readable program executable by the processor; the processor, when executing the computer readable program, implements the steps in the laser beam identification method of the space optical communication system according to any one of claims 1 to 11.
13. A computer-readable storage medium storing one or more programs, the one or more programs being executable by one or more controllers to implement the steps in the method for identifying a laser beam of a space optical communication system according to any one of claims 1 to 11.
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