Intersatellite laser communication anti-interference method, device, equipment, storage medium and product

Abstract

The invention discloses an inter-satellite laser communication anti-interference method, device and equipment, a storage medium and a product, and relates to the technical field of laser communication, the inter-satellite laser communication anti-interference method is applied to an inter-satellite laser communication anti-interference system, and the system comprises an optical fiber circulator, a modulatable fiber grating assembly and a small-range phase shifter; the method comprises the following steps: performing primary interference resistance on incident light through the optical fiber circulator to obtain first signal light output by a target port of the optical fiber circulator and leaked second signal light; performing phase matching on the first signal light and the second signal light according to a small-range phase shifter to obtain third signal light subjected to phase matching; and performing secondary anti-interference on the third signal light based on the modulatable fiber grating assembly to obtain an inter-satellite laser communication anti-interference result. Compared with an existing anti-interference mode through a light splitting light path, the mode of the invention can improve the anti-interference efficiency of inter-satellite laser communication.

Description

Technical Field

[0001] The present application relates to the field of laser communication technology, and in particular to anti-interference methods, devices, equipment, storage media and products for inter-satellite laser communication. Background Art

[0002] Intersatellite laser communication is a common method for people to transmit information between satellites. In order to ensure that the signal can be transmitted continuously and stably at each node, the tracking system needs to have strong anti-interference ability. At present, in the process of intersatellite laser communication, in addition to the common interference of transmission and reception, there are two types of interference. One is that the background light of space (sun transit, moon transit, etc.) will cause strong interference to the system, and the other is the active interference of hostile forces. When the above situation occurs, the stray light will pass through the narrow-band filter and be evenly distributed on the tracking detector. Since the incident light is usually the laser emitted by the optical terminal hundreds of kilometers away, due to errors such as alignment error, link loss, fiber coupling loss, tracking mismatch loss, etc., the incident light power reaching the detector target surface is very low, so the incident light will be annihilated in the above stray light. At present, the tracking system of intersatellite laser communication mainly relies on detectors (such as infrared cameras, position sensors, etc.) to directly detect the energy and position of the light spot, and then calculate the distance between the center of mass of the light spot and the calibration center to provide real-time feedback on the off-target amount of the light spot, and finally track it based on the off-target amount information. However, since the incident light has been annihilated in the above-mentioned stray light, the tracking detector cannot resolve the off-target amount information and the communication is interrupted. Therefore, the anti-interference ability of the tracking system has now greatly restricted the development of traditional laser communication systems. Traditional tracking systems mainly use a spectroscopic optical path composed of reflectors, filters (such as semi-transparent and semi-reflective mirrors) and folding mirrors to achieve spectrometry, and then use detectors to directly detect the energy and position of the light spot, and achieve tracking through off-target feedback. However, traditional tracking systems cannot cope with the strong interference caused by space background light (solar transit, lunar transit, etc.) and hostile forces. Strong stray light will cause the tracking detector to be unable to resolve the off-target information and cannot achieve avoidance control of the interference source, thereby interrupting the laser communication link. In deep space communication, intersatellite laser communication needs to achieve sub-microradian tracking accuracy because the beam divergence angle of the ultra-long-distance communication system needs to be controlled at the microradian level. Traditional direct detection tracking systems are difficult to meet the requirements. Summary of the invention

[0003] The main purpose of this application is to provide an inter-satellite laser communication anti-interference method, device, equipment, storage medium and product, aiming to solve the technical problem of poor anti-interference efficiency of existing inter-satellite laser communications.

[0004] To achieve the above-mentioned purpose, the present application proposes an inter-satellite laser communication anti-interference method, the inter-satellite laser communication anti-interference method is applied to an inter-satellite laser communication anti-interference system, the inter-satellite laser communication anti-interference system includes an optical fiber circulator, a modulatable optical fiber grating component, and a small-range phase shifter;

[0005] The intersatellite laser communication anti-interference method comprises the following steps:

[0006] Performing first-level anti-interference on the incident light through the optical fiber circulator to obtain a first signal light output from a target port of the optical fiber circulator and a leaked second signal light;

[0007] Performing phase matching on the first signal light and the second signal light according to a small-range phase shifter to obtain a third signal light with phase matching completed;

[0008] Based on the modulatable fiber grating component, the third signal light is subjected to secondary anti-interference, and an anti-interference result of inter-satellite laser communication is obtained.

[0009] Optionally, the modulatable fiber Bragg grating component comprises: a core, a cladding, a core mode absorber, a first modulation region, a second modulation region and a third modulation region;

[0010] The step of performing secondary anti-interference on the third signal light based on the modulatable fiber grating component to obtain an anti-interference result for inter-satellite laser communication comprises:

[0011] The interference light in the third signal light is reflected by the first modulation area, and the remaining interference light that is not reflected enters the second modulation area, and then is absorbed by the core mode absorber;

[0012] coupling a target signal light in the third signal light into the cladding based on the fiber core to obtain a fourth signal light;

[0013] The anti-interference result of intersatellite laser communication is output through the third modulation area and the fiber core.

[0014] Optionally, the first modulation region satisfies λ1=2η core1 Λ1, the second modulation area and the third modulation area satisfy: λ 23 =(η core23 -η clad23 )Λ 23 ;

[0015] Where λ1 is the wavelength of the local light emitted by the local laser, η core1 is the equivalent refractive index of the core in the first modulation region, Λ1 is the refractive index variation period in the first modulation region, λ 23 is the wavelength of the signal light, ηcore23 is the core equivalent refractive index of the second modulation region and the third modulation region, η clad23 is the equivalent refractive index of the cladding, Λ 23 is the refractive index variation period of the second modulation area and the third modulation area.

[0016] Optionally, the intersatellite laser communication anti-interference system further comprises: a local oscillator laser, a detector array, a digital signal processor array, a master control module and a large-range phase shifter;

[0017] After the step of performing secondary anti-interference on the third signal light based on the modulatable fiber grating component to obtain an anti-interference result for intersatellite laser communication, the method further includes:

[0018] Based on the local oscillator laser, the output light in the anti-interference result of the inter-satellite laser communication is coherently mixed with the local oscillator light to obtain the anti-interference signal light after frequency selective amplification;

[0019] Detecting the anti-interference signal light according to the detector array to obtain a detection result;

[0020] Phase difference is solved based on the digital signal processor array and the detection result, and the solved result is sent to the master control module. The master control module controls the large-range phase shifter to phase shift the solved result to achieve inter-satellite laser communication tracking.

[0021] Optionally, the intersatellite laser communication anti-interference system further comprises: a beam splitter and a PD detector;

[0022] After the step of performing primary anti-interference on the incident light through the optical fiber circulator to obtain the first signal light output by the target port of the optical fiber circulator and the leaked second signal light, the method further includes:

[0023] Splitting the second signal light into a monitoring signal light and a phase matching signal light by the beam splitter;

[0024] The monitoring signal light is distributed to the PD detector to monitor the status of the optical fiber device.

[0025] Optionally, the step of performing phase matching on the first signal light and the second signal light according to a small-range phase shifter to obtain a third signal light with phase matching includes:

[0026] Phase matching is performed on the first signal light and the phase-matched signal light using a small-range phase shifter to obtain a third signal light with phase matching completed.

[0027] In addition, to achieve the above-mentioned purpose, the present application also proposes an inter-satellite laser communication anti-interference device, which is applied to any of the inter-satellite laser communication anti-interference methods described above, and the inter-satellite laser communication anti-interference device includes:

[0028] A primary anti-interference module, used for performing primary anti-interference on the incident light through the optical fiber circulator to obtain a first signal light output from a target port of the optical fiber circulator and a leaked second signal light;

[0029] A phase matching module, used for performing phase matching on the first signal light and the second signal light according to a small-range phase shifter to obtain a third signal light with phase matching completed;

[0030] The secondary anti-interference module is used to perform secondary anti-interference on the third signal light based on the modulatable fiber grating component to obtain the anti-interference result of inter-satellite laser communication.

[0031] In addition, to achieve the above-mentioned purpose, the present application also proposes an inter-satellite laser communication anti-interference device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, and the computer program is configured to implement the steps of the inter-satellite laser communication anti-interference method as described above.

[0032] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by the processor, the steps of the inter-satellite laser communication anti-interference method as described above are implemented.

[0033] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, it implements the steps of the inter-satellite laser communication anti-interference method as described above.

[0034] The intersatellite laser communication anti-interference method of the present application is applied to the intersatellite laser communication anti-interference system, and the intersatellite laser communication anti-interference system includes a fiber circulator, a modulatable fiber grating component, and a small-range phase shifter; the intersatellite laser communication anti-interference method includes the following steps: the incident light is subjected to primary anti-interference by the fiber circulator to obtain the first signal light output by the target port of the fiber circulator and the second signal light leaked; the first signal light and the second signal light are phase-matched according to the small-range phase shifter to obtain the third signal light with phase matching completed; the third signal light is subjected to secondary anti-interference based on the modulatable fiber grating component to obtain the intersatellite laser communication anti-interference result. Compared with the existing anti-interference method through the split optical path, the above method of the present application can improve the anti-interference efficiency of intersatellite laser communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0037] Figure 1 A flowchart of the first embodiment of the anti-interference method for intersatellite laser communication provided in the present application;

[0038] Figure 2 A diagram showing the optical path in a fiber circulator provided in Example 1 of the anti-interference method for intersatellite laser communication of the present application;

[0039] Figure 3 The internal schematic diagram of the modulatable fiber Bragg grating assembly provided in the first embodiment of the anti-interference method for intersatellite laser communication of the present application;

[0040] Figure 4 A flow chart of the second embodiment of the anti-interference method for intersatellite laser communication provided in the present application;

[0041] Figure 5 The overall structural diagram provided for the second embodiment of the anti-interference method for intersatellite laser communication of the present application;

[0042] Figure 6 This is a schematic diagram of the module structure of the intersatellite laser communication anti-interference device according to an embodiment of the present application;

[0043] Figure 7 This is a schematic diagram of the device structure of the hardware operating environment involved in the inter-satellite laser communication anti-interference method in the embodiment of the present application.

[0044] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0046] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0047] The inter-satellite laser communication anti-interference method of the embodiment of the present application is applied to the inter-satellite laser communication anti-interference system, and the inter-satellite laser communication anti-interference system includes a fiber circulator, a modulatable fiber grating component, and a small-range phase shifter; the inter-satellite laser communication anti-interference method includes the following steps: the incident light is subjected to primary anti-interference by the fiber circulator to obtain the first signal light output by the target port of the fiber circulator and the second signal light leaked; the first signal light and the second signal light are phase-matched according to the small-range phase shifter to obtain the third signal light with phase matching completed; the third signal light is subjected to secondary anti-interference based on the modulatable fiber grating component to obtain the inter-satellite laser communication anti-interference result. Compared with the existing anti-interference method through the split optical path, the above method of the present application can improve the anti-interference efficiency of inter-satellite laser communication.

[0048] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device capable of realizing the above functions, an intersatellite laser communication anti-interference system, etc. The following takes the intersatellite laser communication anti-interference system as an example to illustrate this embodiment and the following embodiments.

[0049] Based on this, the embodiment of the present application provides an anti-interference method for intersatellite laser communication, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the anti-interference method for inter-satellite laser communication of the present application.

[0050] In this embodiment, the intersatellite laser communication anti-interference method is applied to an intersatellite laser communication anti-interference system, and the intersatellite laser communication anti-interference system includes an optical fiber circulator, a modulatable optical fiber grating component, and a small-range phase shifter; the intersatellite laser communication anti-interference method includes steps S10 to S30:

[0051] Step S10, performing first-level anti-interference on the incident light through the optical fiber circulator to obtain a first signal light output by a target port of the optical fiber circulator and a leaked second signal light;

[0052] It should be noted that, please refer to Figure 2 , Figure 2The optical path diagram in the optical fiber circulator provided in the first embodiment of the anti-interference method for intersatellite laser communication of the present application, the optical fiber circulator 5 includes ports 1-4. 7 is a PD detector and 8 is a beam splitter. Most of the signal light in the incident light will enter the port 3 of the optical fiber circulator 5 through the port 2 of the optical fiber circulator 5, and a small part of the signal light will leak from the port 2 of the optical fiber circulator 5 to the port 4 of the optical fiber circulator 5. The target port is the port 2 that transmits most of the signal light. The output of port 2 is the first signal light S1. The light leaking from the port 2 of the optical fiber circulator 5 to the port 4 of the optical fiber circulator 5 is recorded as the second signal light S2.

[0053] Step S20, performing phase matching on the first signal light and the second signal light according to a small-range phase shifter to obtain a third signal light with phase matching completed;

[0054] It should be noted that the phase matching of the first signal light and the second signal light using the small-range phase shifter may be to dynamically ensure the phase matching of the first signal light and the second signal light using the small-range phase shifter.

[0055] Furthermore, in order to detect the status of the optical fiber components of the entire system, the intersatellite laser communication anti-interference system further includes: a beam splitter and a PD detector; after the step S10, it further includes:

[0056] Splitting the second signal light into a monitoring signal light and a phase matching signal light by the beam splitter;

[0057] The monitoring signal light is distributed to the PD detector to monitor the status of the optical fiber device.

[0058] It should be noted that the dividing of the second signal light into the monitoring signal light and the phase matching signal light by the beam splitter can be to divide the second signal light into the monitoring signal light and the phase matching signal light according to a preset ratio. For example, 1 / 10 of the second signal light S2 is allocated to the PD detector for monitoring the status of the optical fiber devices of the entire system, and the remaining 9 / 10 is output from the other port of the beam splitter, that is, the phase matching signal light is recorded as S3.

[0059] Further, the step S29 includes: performing phase matching on the first signal light and the phase-matched signal light according to a small-range phase shifter to obtain a third signal light S 13 .

[0060] Step S30, performing secondary anti-interference on the third signal light based on the modulatable fiber grating assembly to obtain an anti-interference result of inter-satellite laser communication.

[0061] It should be noted that the incident light is composed of signal light and interference light. Ideally, the laser light entering the modulated fiber grating component is all signal light. However, due to the insufficient isolation of the fiber circulator 5 (limited by the manufacturing technology and process technology of the existing circulator), a part of the local light will still leak from port 1 to port 3 and enter the modulated fiber grating component. When there is strong interference mentioned in the background technology, a large amount of interference light will also enter the modulated fiber grating component through the optical transceiver array antenna and the fiber circulator 5. The modulated fiber grating component of this embodiment can be referred to Figure 3 , Figure 3 The internal schematic diagram of the modulated fiber Bragg grating component provided in the first embodiment of the anti-interference method for intersatellite laser communication of the present application; the modulated fiber Bragg grating component in this embodiment includes three modulation regions, and the core equivalent refractive index η of the first modulation region 10-5 core1 , the core equivalent refractive index η of the second modulation region 10-6 and the third modulation region 10-8 core23 and the equivalent refractive index η of the cladding 10-4 c1ad After the design is completed, it is generally a fixed value. When the wavelength of the signal light changes, the refractive index change period Λ of the second modulation area 10-6 and the third modulation area 10-8 can be changed by the long period grating adjuster 10-2 23 To make λ 23 =(η core23 -η clad )Λ 23 Continue to establish, 23 is the signal light wavelength, thereby ensuring that the signal light can still pass through the modulated fiber grating component; when the local light wavelength needs to be changed, the refractive index change period Λ1 of the first modulation area 10-5 can be changed by the short-period grating regulator 10-1 to make λ1=2η core1Λ1 continues to hold, λ1 is the wavelength of the local light emitted by the local laser, thereby ensuring that the local light will still be reflected back by the modulated fiber grating component and will not affect subsequent detection. By adjusting the short-period grating regulator 10-1 and the long-period grating regulator 10-2, it is possible to adapt to the complex and changeable communication requirements of intersatellite and flexible networking; according to the above design of the three modulation areas of the modulated fiber grating component, the following effects will occur: when the incident light containing different wavelengths enters the modulated fiber grating component from the fiber core 10-3 (from left to right), most of the local light leaked from port 1 to port 3 will be in the first modulation area 10- 5, a small part of the local light and the incident light enter the second modulation area 10-6, at this time, most of the signal light in the incident light will be coupled from the core 10-3 to the cladding 10-4, and the remaining lasers of all wavelengths will continue to be transmitted in the core 10-3, and will be absorbed and lost at the core mode absorber 10-7. After the signal light in the cladding 10-4 is transmitted for a certain distance in the cladding 10-4, it will be reversely coupled back to the third modulation area 10-8 again, and output from the modulated fiber grating component, completing the second-level anti-interference, and obtaining the anti-interference result of intersatellite laser communication, that is, the signal light output from the modulated fiber grating component.

[0062] The intersatellite laser communication anti-interference method of this embodiment is applied to the intersatellite laser communication anti-interference system, and the intersatellite laser communication anti-interference system includes a fiber circulator, a modulatable fiber grating component, and a small-range phase shifter; the intersatellite laser communication anti-interference method of this embodiment includes the following steps: the incident light is subjected to primary anti-interference by the fiber circulator to obtain the first signal light output by the target port of the fiber circulator and the second signal light leaked; the first signal light and the second signal light are phase-matched according to the small-range phase shifter to obtain the third signal light with completed phase matching; the third signal light is subjected to secondary anti-interference based on the modulatable fiber grating component to obtain the intersatellite laser communication anti-interference result. Compared with the existing anti-interference method through the split optical path, the above method of this embodiment can improve the anti-interference efficiency of intersatellite laser communication.

[0063] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction, and will not be repeated in the following. Figure 4 , Figure 4 The flowchart of the second embodiment of the intersatellite laser communication anti-interference method of the present application is provided. The intersatellite laser communication anti-interference system also includes: a local oscillator laser, a detector array, a digital signal processor array, a master control module and a large-range phase shifter; after the step S30, the following steps are also included:

[0064] Step S301: coherently mixing the output light in the anti-interference result of the inter-satellite laser communication with the local oscillator light based on the local oscillator laser to obtain the anti-interference signal light after frequency selective amplification;

[0065] It should be noted that, please refer to Figure 5 , Figure 5 The overall structural diagram of the second embodiment of the intersatellite laser communication anti-interference method of the present application is provided. The intersatellite laser communication anti-interference system of the present embodiment includes a master control system 1 (i.e., the master control module), an optical transceiver array antenna (2-1, 2-2, ... 2-N), an incident light 3 (composed of a signal light and an interference light), a large-range phase shifter (4-1, 4-2 ... 4-N), an optical fiber circulator 5, a local laser 6, a PD detector 7, a beam splitter 8, a small-range phase shifter (9-1, 9-2, ... 9-N), a local laser 6, a PD detector 7, a beam splitter 8, and a small-range phase shifter (9-1, 9-2, ... 9-N). -N), a modulated fiber grating component 10 (specifically comprising a short-period grating pitch regulator 10-1, a long-period grating pitch regulator 10-2, a core 10-3, a cladding 10-4, a first-segment modulation region 10-5, a second-segment modulation region 10-6, a core mode absorber 10-7, and a third-segment modulation region 10-8), a local oscillator laser 11, a detector array (12-1, 12-2, ... 12-N) and a digital signal processor array (13-1, 13-2, ... 13-N).

[0066] It should be noted that the output light in the anti-interference result of the intersatellite laser communication based on the local oscillator laser is coherently mixed with the local oscillator light to obtain the anti-interference signal light after frequency selective amplification. The signal light output from the modulated fiber grating component 10 will enter the local oscillator laser 11 and be mixed with the local oscillator light in the local oscillator laser 11. Since only the signal light can be amplified by coherent mixing, the amplified signal light, i.e. the anti-interference signal light, can be obtained.

[0067] Step S302: detecting the anti-interference signal light according to the detector array to obtain a detection result;

[0068] In a specific implementation, the detector array (12-1, 12-2, ... 12-N) detects the incoming signal light to obtain a detection result.

[0069] Step S303: performing phase difference calculation based on the digital signal processor array and the detection result, and sending the calculation result to the master control module, the master control module performs phase shifting on the calculation result by controlling the large-range phase shifter to realize inter-satellite laser communication tracking.

[0070] In a specific implementation, after the anti-interference signal light is detected according to the detector array, the phase difference is solved by using the digital signal processor array (13-1, 13-2, ... 13-N), and the digital signal processor array (13-1, 13-2, ... 13-N) gives the solved information to the master control system 1 to control the large-range phase shifter (4-1, 4-2 ... 4-N) so that the phases of each S1 are in phase, thereby realizing inter-satellite laser communication tracking.

[0071] In the specific implementation, this embodiment is introduced from two aspects of light beam reception and light beam emission. For light beam reception: incident light 3 enters the optical transceiver array antenna (2-1, 2-2, ... 2-N).

[0072] 1. Signal light:

[0073] (1) Most of the signal light in the incident light 3 enters the port 3 of the optical fiber circulator 5 through the port 2 of the optical fiber circulator 5 (this part of the signal light is defined as S1, and the small part of the signal light leaking from the port 2 of the optical fiber circulator 5 to the port 4 of the optical fiber circulator 5 is defined as S2).

[0074] (2) 1 / 10 of the signal light S2 (the specific allocation ratio can be customized according to the usage scenario) is allocated to the PD detector 7 for monitoring the status of the optical fiber components of the entire system, and the remaining 9 / 10 is output from another port (this part of the incident light is recorded as S3), and the phase matching of S1 and S3 is dynamically guaranteed through the small-range phase shifter (9-1, 9-2...9-N) (the adjustment target of the small-range phase shifter (9-1, 9-2...9-N) is to ensure that the signal-to-noise ratio of the detector array (12-1, 12-2,...12-N) meets the system requirements).

[0075] (3) S1 and S3 complete phase matching, and the signal light after beam combination is recorded as S 13 , S 13 Enter the core 10-3 of the modulatable fiber Bragg grating component 10. The modulation region of the modulatable fiber Bragg grating component 10 consists of three sections: the first modulation region 10-5 satisfies λ1=2η core1 Λ1, the second modulation area 10-6 and the third modulation area 10-8 satisfy: λ 23 =(η core23 -η clad )Λ 23 , where λ1 is the wavelength of the local light emitted by the local laser 6, η core1 is the core equivalent refractive index of the first modulation region 10-5, Λ1 is the refractive index variation period of the first modulation region 10-5, λ 23 is the wavelength of the signal light, η core23is the core equivalent refractive index of the second modulation region 10-6 and the third modulation region 10-8, η clad is the equivalent refractive index of the cladding 10-4, Λ 23 is the refractive index variation period of the second modulation region 10-6 and the third modulation region 10-8. 13 It will be coupled from the core 10-3 to the cladding 10-4, denoted as S 131 , not coupled to S in cladding 10-4 13 S 132 , S 131 After transmitting a certain distance in the cladding 10-4, most of it will be reversely coupled back to the third modulation area 10-8 again, and output from the modulated fiber grating component 10 along the core 10-3, and then coherently mixed with the local oscillator laser 11, and then enter the detector array (12-1, 12-2, ... 12-N) for detection, and then use the digital signal processor array (13-1, 13-2, ... 13-N) to solve the phase difference. The digital signal processor array (13-1, 13-2, ... 13-N) gives the solved information to the master control system 1 to control the large-range phase shifter (4-1, 4-2 ... 4-N) so that the phases between each S1 are in phase, thereby achieving tracking; S 132 It will propagate in the fiber core 10-3 and be absorbed and lost at the core mode absorber 10-7.

[0076] 2. Interference light:

[0077] (1) Most of the interference light will enter the port 3 of the fiber circulator 5 from the port 2 of the fiber circulator 5, and then enter the core 10-3 of the modulated fiber grating assembly 10, where the interference light is consistent with the local light wavelength λ 23 Most of the same interference light will be reflected back at the first modulation area 10-5, and the rest of the interference light will enter the second modulation area 10-6. Except for a part of the interference light with the same wavelength λ1 as the signal light, which will be coupled into the cladding 10-4 and transmitted in the cladding for a distance before coupling back to the core 10-3, most of the rest will be absorbed and lost at the core mode absorber 10-7. Even if some interference light with a wavelength other than the incident light λ1 is output from the modulated fiber grating assembly 10, it will not affect subsequent detection because it cannot be mixed with the local oscillator laser 11.

[0078] (2) A small part of the interference light will leak from port 2 to port 4 and re-enter the core 10-3 of the modulated fiber grating assembly 10. The subsequent optical path is consistent with the previous step and will not be repeated.

[0079] For light beam emission: the local laser 6 emits local light: most of the local light will enter port 2 from port 1 and then be emitted, a small part will leak from port 1 to port 3, and then enter the core 10-3 of the modulated fiber grating component 10, most of the local light will be reflected back in the first modulation area 10-5, a small part of the local light will be transmitted into the second modulation area 10-6, and will be absorbed and lost at the core mode absorber 10-7.

[0080] Intersatellite laser communication, especially in deep space communication, needs to control the beam divergence angle of ultra-long-distance communication systems at the micro-radian level, so the tracking accuracy of deep space laser communication needs to reach the sub-micro-radian level, and existing laser communication tracking systems are difficult to meet the requirements. The incident light and the local oscillator light are mixed by heterodyne coherence method, and the light field is detected by the detector array (12-1, 12-2, ... 12-N) to obtain the phase difference of adjacent detectors, and then the common phase. This embodiment uses phase detection for tracking, and its detection accuracy is more than three orders of magnitude higher than that of traditional amplitude detection, which effectively solves the high requirements of deep space communication for laser communication tracking accuracy. At the same time, due to the amplification effect of the local oscillator light, the system has a higher detection gain and detection sensitivity, which effectively solves the tracking needs of intersatellite long-distance communication.

[0081] In this embodiment, the digital signal processor array (13-1, 13-2, ... 13-N) calculates the phase information between the detector arrays (12-1, 12-2, ... 12-N), and then feeds it back to the master control system 1. Finally, the master control system 1 controls the large-scale phase shifter (4-1, 4-2 ... 4-N) to make the detector arrays (12-1, 12-2, ... 12-N) co-phase to achieve tracking. The function of the small-scale phase shifter (9-1, 9-2 ... 9-N) is to ensure the phase matching of the signal light coming out of port 3 and the signal light leaking from port 2 to port 4 according to the signal-to-noise ratio fed back by each detector array (12-1, 12-2, ... 12-N). Since the isolation of the optical fiber circulator 5 is not enough (limited by the manufacturing technology and process technology of the existing circulator), part of the signal light entering from port 2 will also enter port 4. A part of the signal light energy leaking to port 4 will be distributed to the PD detector 7 through the beam splitter 8, and the remaining part will be output from the other port and then combined with the signal light coming out of port 3. The phase matching of the two combined signal lights is ensured by the small-range phase shifter 9, thereby increasing the signal light energy that finally reaches the detector array 12. At the same time, the PD detector 7 can also be used to monitor whether there is any problem with the optical fiber device of the entire system, so as to detect and deal with it in time.

[0082] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the anti-interference method of intersatellite laser communication of the present application. More simple transformations based on this technical concept are all within the protection scope of the present application.

[0083] This application also provides an intersatellite laser communication anti-interference device, please refer to Figure 6 The inter-satellite laser communication anti-interference device is applied to the inter-satellite laser communication anti-interference method described in the above embodiment, and the inter-satellite laser communication anti-interference device includes:

[0084] A primary anti-interference module 10, used for performing primary anti-interference on the incident light through the optical fiber circulator to obtain a first signal light output from a target port of the optical fiber circulator and a leaked second signal light;

[0085] A phase matching module 20, configured to perform phase matching on the first signal light and the second signal light according to a small-range phase shifter to obtain a third signal light with phase matching completed;

[0086] The secondary anti-interference mode 30 is used to perform secondary anti-interference on the third signal light based on the modulatable fiber grating component to obtain the anti-interference result of inter-satellite laser communication.

[0087] In this embodiment, the fiber circulator performs primary anti-interference on the incident light to obtain the first signal light output from the target port of the fiber circulator and the second signal light leaked; the first signal light and the second signal light are phase-matched according to the small-range phase shifter to obtain the third signal light with phase matching completed; the third signal light is subjected to secondary anti-interference based on the modulatable fiber grating component to obtain the anti-interference result of intersatellite laser communication. Compared with the existing anti-interference method through the split light path, the above method of this embodiment can improve the anti-interference efficiency of intersatellite laser communication.

[0088] The intersatellite laser communication anti-interference device provided by the present application adopts the intersatellite laser communication anti-interference method in the above-mentioned embodiment, which can solve the technical problem of poor anti-interference efficiency of existing intersatellite laser communication. Compared with the prior art, the beneficial effects of the intersatellite laser communication anti-interference device provided by the present application are the same as the beneficial effects of the intersatellite laser communication anti-interference method provided by the above-mentioned embodiment, and the other technical features of the intersatellite laser communication anti-interference device are the same as the features disclosed in the above-mentioned embodiment method, which will not be repeated here.

[0089] The present application provides an inter-satellite laser communication anti-interference device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the inter-satellite laser communication anti-interference method in the above-mentioned embodiment one.

[0090] Reference below Figure 7 , which shows a schematic diagram of the structure of an intersatellite laser communication anti-interference device suitable for implementing the embodiment of the present application. The intersatellite laser communication anti-interference device in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 7 The intersatellite laser communication anti-interference device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0091] like Figure 7As shown, the intersatellite laser communication anti-interference device may include a processing device 1001 (such as a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read O nly Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the intersatellite laser communication anti-interference device are also stored. The processing device 1001, ROM1002 and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems may be connected to the I / O interface 1006: input devices 1007 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices 1003 including, for example, a magnetic tape, a hard disk, etc.; and communication devices 1009. The communication device 1009 may allow the intersatellite laser communication anti-interference device to communicate wirelessly or wired with other devices to exchange data. Although the intersatellite laser communication anti-interference device with various systems is shown in the figure, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems may be implemented or have alternatively.

[0092] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0093] The intersatellite laser communication anti-interference device provided by the present application adopts the intersatellite laser communication anti-interference method in the above embodiment, which can solve the technical problem of poor anti-interference efficiency of existing intersatellite laser communication. Compared with the prior art, the beneficial effects of the intersatellite laser communication anti-interference device provided by the present application are the same as the beneficial effects of the intersatellite laser communication anti-interference method provided by the above embodiment, and the other technical features of the intersatellite laser communication anti-interference device are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0094] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0095] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0096] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the inter-satellite laser communication anti-interference method in the above-mentioned embodiment.

[0097] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0098] The above-mentioned computer-readable storage medium may be included in the inter-satellite laser communication anti-interference device; or it may exist independently without being assembled into the inter-satellite laser communication anti-interference device.

[0099] The computer-readable storage medium carries one or more programs. When the one or more programs are executed by the inter-satellite laser communication anti-interference device, the inter-satellite laser communication anti-interference device executes the inter-satellite laser communication anti-interference method.

[0100] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0101] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0102] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0103] The readable storage medium provided by the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned intersatellite laser communication anti-interference method, and can solve the technical problem of poor anti-interference efficiency of existing intersatellite laser communications. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by the present application are the same as the beneficial effects of the intersatellite laser communication anti-interference method provided by the above-mentioned embodiment, and will not be repeated here.

[0104] The present application also provides a computer program product, including a computer program, which implements the steps of the above-mentioned inter-satellite laser communication anti-interference method when executed by a processor.

[0105] The computer program product provided by the present application can solve the technical problem of poor anti-interference efficiency of existing intersatellite laser communication. Compared with the prior art, the beneficial effects of the computer program product provided by the present application are the same as the beneficial effects of the intersatellite laser communication anti-interference method provided by the above embodiment, which will not be described in detail here.

[0106] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. An intersatellite laser communication anti-interference method, characterized in that: The intersatellite laser communication anti-interference method is applied to an intersatellite laser communication anti-interference system, and the intersatellite laser communication anti-interference system includes an optical fiber circulator, a modulatable optical fiber grating component, and a small-range phase shifter; The intersatellite laser communication anti-interference method comprises the following steps: Performing first-level anti-interference on the incident light through the optical fiber circulator to obtain a first signal light output from a target port of the optical fiber circulator and a leaked second signal light; Performing phase matching on the first signal light and the second signal light according to a small-range phase shifter to obtain a third signal light with phase matching completed; Based on the modulatable fiber grating component, the third signal light is subjected to secondary anti-interference, and an anti-interference result of inter-satellite laser communication is obtained.

2. The intersatellite laser communication anti-interference method according to claim 1, characterized in that: The modulatable fiber grating component comprises: a core, a cladding, a core mode absorber, a first modulation region, a second modulation region and a third modulation region; The step of performing secondary anti-interference on the third signal light based on the modulatable fiber grating component to obtain an anti-interference result for inter-satellite laser communication comprises: The interference light in the third signal light is reflected by the first modulation area, and the remaining interference light that is not reflected enters the second modulation area, and then is absorbed by the core mode absorber; coupling a target signal light in the third signal light into the cladding based on the fiber core to obtain a fourth signal light; The anti-interference result of intersatellite laser communication is output through the third modulation area and the fiber core.

3. The intersatellite laser communication anti-interference method according to claim 2, characterized in that: The first modulation region satisfies λ1=2η core1 Λ1, the second modulation area and the third modulation area satisfy: λ 23 =(η corce23 -η clad )Λ 23 ; Where λ1 is the wavelength of the local light emitted by the local laser, η core1 is the equivalent refractive index of the core in the first modulation region, Λ1 is the refractive index variation period in the first modulation region, λ 23 is the wavelength of the signal light, η core23 is the core equivalent refractive index of the second modulation region and the third modulation region, η clad is the equivalent refractive index of the cladding, Λ 23 is the refractive index variation period of the second modulation area and the third modulation area.

4. The intersatellite laser communication anti-interference method according to claim 1, characterized in that: The intersatellite laser communication anti-interference system also includes: a local oscillator laser, a detector array, a digital signal processor array, a master control module and a large-range phase shifter; After the step of performing secondary anti-interference on the third signal light based on the modulatable fiber grating component to obtain an anti-interference result for intersatellite laser communication, the method further includes: Based on the local oscillator laser, the output light in the anti-interference result of the inter-satellite laser communication is coherently mixed with the local oscillator light to obtain the anti-interference signal light after frequency selective amplification; Detecting the anti-interference signal light according to the detector array to obtain a detection result; Phase difference is solved based on the digital signal processor array and the detection result, and the solved result is sent to the master control module. The master control module controls the large-range phase shifter to phase shift the solved result to achieve inter-satellite laser communication tracking.

5. The intersatellite laser communication anti-interference method according to any one of claims 1 to 4, characterized in that: The intersatellite laser communication anti-interference system also includes: a beam splitter and a PD detector; After the step of performing primary anti-interference on the incident light through the optical fiber circulator to obtain the first signal light output by the target port of the optical fiber circulator and the leaked second signal light, the method further includes: Splitting the second signal light into a monitoring signal light and a phase matching signal light by the beam splitter; The monitoring signal light is distributed to the PD detector to monitor the status of the optical fiber device.

6. The intersatellite laser communication anti-interference method according to claim 5, characterized in that: The step of performing phase matching on the first signal light and the second signal light according to the small-range phase shifter to obtain a third signal light with phase matching includes: Phase matching is performed on the first signal light and the phase-matched signal light using a small-range phase shifter to obtain a third signal light with phase matching completed.

7. An intersatellite laser communication anti-interference device, characterized in that: The inter-satellite laser communication anti-interference device is applied to the inter-satellite laser communication anti-interference method according to any one of claims 1 to 6, and the inter-satellite laser communication anti-interference device comprises: A primary anti-interference module, used for performing primary anti-interference on the incident light through the optical fiber circulator to obtain a first signal light output from a target port of the optical fiber circulator and a leaked second signal light; A phase matching module, used for performing phase matching on the first signal light and the second signal light according to a small-range phase shifter to obtain a third signal light with phase matching completed; The secondary anti-interference module is used to perform secondary anti-interference on the third signal light based on the modulatable fiber grating component to obtain the anti-interference result of inter-satellite laser communication.

8. An intersatellite laser communication anti-interference device, characterized in that: The device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the inter-satellite laser communication anti-interference method according to any one of claims 1 to 6.

9. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the inter-satellite laser communication anti-interference method according to any one of claims 1 to 6 are implemented.

10. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the inter-satellite laser communication anti-interference method according to any one of claims 1 to 6 are implemented.

Images