Laser intersatellite link testing method, system, device and computer readable medium

Abstract

The present invention relates to a laser intersatellite link test method, system, device and computer-readable medium, which are used for docking test of laser intersatellite link by using laser intersatellite link test system, wherein the laser intersatellite link test system comprises: any of laser high-speed processor, first laser terminal, second laser terminal, first collimator, second collimator, monitoring camera, micro-vibration simulation galvanometer and turntable; the method comprises: performing signal light capture and tracking test; performing beacon light capture and communication ranging test; performing beacon light jump capture and tracking test; performing link break recapture test; performing long-time link establishment assessment test; thereby obtaining any of capture time, link establishment time, coherent precise tracking accuracy, bit error rate, ranging random error, link re-establishment time, link establishment interruption number and re-acquisition success number of laser intersatellite link. The present invention can effectively verify the matching and reliability of work processes between each single machine, and can effectively prevent system risks.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of laser inter-satellite link testing, and in particular to a laser inter-satellite link testing method, system, device and computer-readable medium. Background Art

[0002] Satellite laser intersatellite links are increasingly being used in the construction of satellite networks due to their advantages of high speed, low power consumption, and light weight. Satellite laser intersatellite links need to establish a connection between two satellites in orbit. Since this technology is still in the application exploration stage, ground verification tests of laser intersatellite links are particularly critical for their stable operation in orbit.

[0003] At present, due to the difficulty of satellite in-orbit link establishment and the differences in design of various laser terminal manufacturers, the in-orbit laser inter-satellite link establishment may be unstable or even unable to establish a link. It is necessary to carry out laser inter-satellite link testing on the ground before the satellite is launched. Therefore, a reliable laser inter-satellite link testing solution is urgently needed to verify the matching of the workflows between each single machine and the reliability of the link establishment process of each terminal, so as to effectively prevent system risks. Summary of the invention

[0004] The technical problem to be solved by the present application is to provide a laser intersatellite link testing method, system, device and computer-readable medium, which can effectively verify the matching of the work processes between each single machine and the reliability of the coordination of the link establishment processes of each terminal, and can effectively prevent system risks.

[0005] The technical solution adopted by the present application to solve the above-mentioned technical problems is a laser intersatellite link test method, which is used to perform a docking test on the laser intersatellite link using a laser intersatellite link test system. The laser intersatellite link test system includes: a laser high-speed processor, a first laser terminal, a second laser terminal, a first collimator, a second collimator, a monitoring camera, a micro-vibration simulation galvanometer, and a turntable, or any combination thereof; the method includes: performing a signal light capture and tracking test; performing a beacon light capture and tracking and communication ranging test; performing a beacon light jump capture and tracking test; performing a link break recapture test; and performing a long-term link establishment assessment test; thereby obtaining the capture time, link establishment time, coherent precise tracking accuracy, bit error rate, ranging random error, link re-establishment time, number of link establishment interruptions, and number of successful recapture, or any combination thereof, of the laser intersatellite link.

[0006] In order to solve the above technical problems, the present application also proposes a laser intersatellite link test system, including: a system test platform, including: an optical air-floating platform, a turntable, a first collimator, a second collimator, a back-end optical path system, and a laser high-speed processor, or any combination thereof; test equipment, including: an optical power meter, an optical reference transmitter, an oscilloscope, a laser, a first laser terminal, a second laser terminal, a surveillance camera, and a micro-vibration simulation galvanometer, or any combination thereof; an auxiliary calibration device, including an electronic theodolite; a processor, electrically connected to the system test platform, the test equipment, and the auxiliary calibration device, respectively, and the processor uses the above laser intersatellite link test method to perform a docking test on the laser intersatellite link.

[0007] In order to solve the above technical problems, the present application also proposes a laser inter-satellite link testing device, comprising: a memory for storing instructions executable by a processor; a processor for executing the instructions to implement the above laser inter-satellite link testing method.

[0008] In order to solve the above technical problems, the present application also proposes a computer-readable medium storing computer program codes, and the computer program codes implement the above laser intersatellite link testing method when executed by a processor.

[0009] The technical solution of the present application can simulate various working modes and working conditions of satellite laser intersatellite links during their in-orbit operation by constructing a laser intersatellite link test system; by performing signal light acquisition and tracking tests, beacon light acquisition and communication ranging tests, beacon light step-by-step acquisition and tracking tests, link breakage and re-acquisition tests, and long-term link establishment assessment tests, it is possible to verify the working modes and performance of laser intersatellite links under various working conditions on the ground; based on the parameters obtained from various tests, problems with the laser intersatellite link can be effectively discovered, the reliability of the test can be improved, and the risk of in-orbit communication of the satellite laser intersatellite link can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings, wherein:

[0011] Figure 1 is an exemplary flow chart of a laser intersatellite link testing method according to an embodiment of the present application;

[0012] Figure 2 is a schematic diagram of a laser intersatellite link test system according to an embodiment of the present application;

[0013] Figure 3 is a schematic diagram of a laser intersatellite link test system according to another embodiment of the present application;

[0014] Figure 4is a schematic diagram of a laser intersatellite link test system according to another embodiment of the present application;

[0015] Figure 5 It is a system block diagram of a laser intersatellite link testing device according to an embodiment of the present application. DETAILED DESCRIPTION

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0017] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein, and therefore the present application is not limited to the specific embodiments disclosed below.

[0018] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0019] Flowcharts are used in the present application to illustrate the operations performed by the system according to the embodiments of the present application. It should be understood that the preceding or following operations are not necessarily performed accurately in order. On the contrary, various steps may be processed in reverse order or simultaneously. At the same time, other operations may be added to these processes, or one or more operations may be removed from these processes.

[0020] Satellite laser intersatellite links need to establish a connection between two satellites in orbit. There are many ways to establish the connection during this process, such as: signal light acquisition mode, beacon light acquisition mode, beacon light jump acquisition mode, link break re-acquisition mode and long-term link establishment test.

[0021] Satellite laser intersatellite link ground wireless test can verify the acquisition and link establishment workflow, test the acquisition time and acquisition probability. For example, as shown in Table 1 below, the test items include signal light acquisition test, beacon light acquisition and communication ranging test, beacon light hopping acquisition test, link break re-acquisition test, and long-term link establishment assessment test.

[0022] Table 1 Laser link connection test items

[0023]

[0024] The laser inter-satellite link test system of the present application is first introduced below, and the laser inter-satellite link test method of the present application will be introduced later. Figure 2is a schematic diagram of a laser intersatellite link test system according to an embodiment of the present application, Figure 4 Schematic diagram of a laser intersatellite link test system according to another embodiment of the present application. Figure 2 and Figure 4 Some components of the laser intersatellite link test system of the present application are shown in FIG.

[0025] refer to Figure 2 and Figure 4 As shown, the present application proposes a laser intersatellite link test system, including: a system test platform, including: an optical air-floating platform, a turntable, a first collimator, a second collimator, a back-end optical path system, a laser high-speed processor or any combination thereof; test equipment, including: an optical power meter, an optical reference transmitter, an oscilloscope, a laser, a first laser terminal (i.e. Figure 4 The laser terminal A in the second laser terminal (i.e. Figure 4 A laser terminal B in the system), a surveillance camera, a micro-vibration simulation galvanometer, or any combination thereof; an auxiliary calibration device, including an electronic theodolite; a processor, which is electrically connected to the system test platform, the test equipment, and the auxiliary calibration device, respectively, and the processor uses the laser inter-satellite link test method described later in this application to perform a docking test on the laser inter-satellite link.

[0026] Exemplarily, the laser intersatellite link test and verification system of the present application consists of three parts: system test platform, performance test equipment, auxiliary calibration equipment and related supporting software. The present application can achieve the goal of meeting the wireless test requirements of single-end and double-end laser communication payloads.

[0027] The system test platform can be composed of an optical air-floating shock-absorbing platform, a high-precision two-dimensional turntable, a parallel light tube, a back-end optical path and related supporting software, and serves as the basic platform for carrying out laser communication payload equipment testing and performance verification in this application.

[0028] The performance test equipment can be composed of standard test equipment such as high-sensitivity optical power meters, optical reference transmitters, oscilloscopes, etc., which are used to test the key performance indicators of laser terminals.

[0029] The auxiliary calibration equipment may be composed of a collimator for self-test and an electronic theodolite, etc., and is mainly used to calibrate the link attenuation and system optical axis of the system test platform.

[0030] Figure 3 FIG. 1 is a schematic diagram of a laser intersatellite link test system according to another embodiment of the present invention. Figures 2 to 4As shown, illustratively, the high-precision two-dimensional turntable, as a satellite dynamic simulation device, can carry laser communication payload products and simulate the orbit and attitude changes of satellites in orbit. As the main bearing platform of the optical test equipment, the optical air-floating platform has the functions of isolating vibrations and supporting equipment. The laser communication payload transmits and receives far-field parallel light through a collimator. The collimator focuses the optical signal of the laser communication payload and performs color separation, attenuation, micro-vibration deflection, spot monitoring, etc., and couples it into the optical fiber for transmission. The collimator expands the optical signal emitted by the simulation device or another laser communication payload coupled into the optical fiber and converts it into far-field spatial light, which is then transmitted to other laser communication payloads.

[0031] refer to Figure 2 and Figure 3 As shown, in some embodiments, the back-end optical path system includes: a visible light camera, an energy spectrometer, a two-color spectrometer, an echo suppressor, a fiber optic holder, a near-infrared camera, an image processing unit, and a bidirectional adjustable gain optical power amplifier, or any combination thereof.

[0032] Exemplarily, the laser intersatellite link test and verification system of the present application has the following functions:

[0033] (1) The system has self-checking capability, which allows the system to perform self-checking and calibration on various devices and optical axes before the test.

[0034] (2) Ability to simulate pointing changes caused by satellite attitude and orbit changes.

[0035] (3) It has the function of mutual coupling and conversion of spatial parallel light and wired light, and can perform color separation, attenuation, spot monitoring, and fiber coupling of light of different wavelengths, as well as isolation and bidirectional amplification of specified wavelengths.

[0036] (4) It has functions such as satellite platform micro-vibration simulation.

[0037] (5) It should be capable of simulating the transmission of laser signals using lasers, optical reference transmitters and other equipment, and cooperate in the capture test and tracking test of single-ended laser communication payloads.

[0038] (6) It has the capability to support two-way dynamic capture, tracking, and full-process communication testing and verification of dual-end laser communication payloads.

[0039] (7) It has the ability to test and analyze key indicators of capture and communication, such as laser link capture time, capture probability, tracking accuracy, communication rate, communication sensitivity, bit error rate, etc.

[0040] (8) It has the ability to test laser beam characteristics and spot pointing, meeting the requirements of laser terminal space tracking performance testing and verification.

[0041] The laser intersatellite link testing method of the present application is introduced below.

[0042] This application proposes a laser intersatellite link test method, which can be applied to the scenario of using a laser intersatellite link test system to perform a docking test on a laser intersatellite link. Depending on the test type, components in the laser intersatellite link test system can be freely selected. Figure 3 and Figure 4 As shown, for example, a laser high-speed processor, a first laser terminal, a second laser terminal, a first collimator, a second collimator, a monitoring camera, a micro-vibration simulation galvanometer, a turntable, or any combination thereof can be selected to construct a laser intersatellite link test system. The first laser terminal referred to in the following text of this application is equivalent to Figure 4 The laser terminal A in the second laser terminal is equivalent to Figure 4 Laser terminal B in.

[0043] refer to Figure 4 As shown, the satellite computer, laser high-speed processor, laser terminal, laser wireless test platform and ground equipment can be connected to form a test verification system. The test boundary conditions and initial bias of the two ends (i.e., the first laser terminal and the second laser terminal) are set according to the specific test items to carry out signal light capture, beacon light capture, beacon light hopping, and broken link recapture tests. The participating laser terminals are paired, and the paired two terminals are numbered as laser terminal A and laser terminal B for distinction.

[0044] Figure 1 is an exemplary flow chart of a laser intersatellite link testing method according to an embodiment of the present application, with reference to Figure 1 As shown, the laser intersatellite link testing method of this embodiment includes the following steps:

[0045] Step SA: Perform signal light tracking test.

[0046] Step SB: Perform beacon light tracking and communication ranging tests.

[0047] Step SC: Perform beacon light hopping tracking test.

[0048] Step SD: Perform chain breakage-recapture test.

[0049] Step SE: Conduct a long-term chain building assessment test.

[0050] Step SF: obtaining one or any combination of the capture time, link establishment time, coherent tracking accuracy, bit error rate, ranging random error, link re-establishment time, link establishment interruption times, and re-capture success times of the laser inter-satellite link.

[0051] The above steps SA to SF are described in detail below:

[0052] In step SA, a signal light tracking test is performed. By way of example, the signal light tracking test can ensure that the laser intersatellite link can accurately and quickly capture and track the signal light, providing a stable foundation for subsequent communication and data transmission.

[0053] In some embodiments, performing a signal light tracking test includes:

[0054] Step SA1: Control the first laser terminal to align with the optical axis of the first collimator, and control the second laser terminal to align with the optical axis of the second collimator.

[0055] Step SA2: adjust the attenuation value of the laser intersatellite link, adjust the signal light transmission power of the first laser terminal, and adjust the signal light transmission power of the second laser terminal, so that the signal light power received by the entrance pupil reaches a preset optical power value.

[0056] Step SA3: Inject the first link establishment planning table into the laser high-speed processor. The elements of the first link establishment planning table include: the transmitting signal laser of the first laser terminal transmits Xnm left-handed polarization state and receives Ynm right-handed polarization state; the transmitting signal laser of the second laser terminal transmits Ynm right-handed polarization state and receives Xnm left-handed polarization state.

[0057] Step SA4: Set the initial bias value of the first laser terminal and the initial bias value of the second laser terminal according to the first preset table (see below), and perform the test condition simulation in the first preset table.

[0058] Step SA5: Control the first laser terminal to start scanning, control the second laser terminal to start staring, monitor the scanning status of the first laser terminal, and start timing from the start of scanning.

[0059] Step SA6: In response to the second laser terminal receiving the signal light from the first laser terminal, the second laser terminal automatically adjusts its own direction so that the signal light from the second laser terminal is aimed at the first laser terminal.

[0060] Step SA7: In response to the first laser terminal receiving the signal light of the second laser terminal, the first laser terminal is controlled to stop scanning, and the first laser terminal automatically adjusts its own direction so that the signal light of the first laser terminal is aimed at the second laser terminal; the first laser terminal and the second laser terminal stably track each other's signal light within their own coherent precise tracking field of view, or in response to continuous detection of optical signals; switch to the coherent precise tracking mode; in response to the coherent precise tracking accuracy meeting the preset accuracy, read the current timing value to obtain the capture time.

[0061] Step SA8: Wait for a first preset time length, send a capture-to-communication request to the laser high-speed processor according to the preset link establishment process, and switch the signal light intensity modulation to BPSK modulation of a fixed data sequence.

[0062] Step SA9: In response to the capture-to-communication request, the laser high-speed processor performs signal light frequency capture and phase locking, thereby demodulating the fixed data sequence and completing link establishment, and reading the current timing value to obtain the link establishment time.

[0063] Step SA10: The first laser terminal and the second laser terminal maintain the coherent precise tracking mode for a second preset time, store the monitoring images of the surveillance camera, and obtain the latest coherent precise tracking accuracy of the first laser terminal and the second laser terminal.

[0064] Step SA11: reset the initial bias value of the first laser terminal and the initial bias value of the second laser terminal according to the first preset table, and re-execute the test condition simulation in the first preset table; repeat steps SA5 to SA10 until the test items and test condition simulations in the first preset table are completely traversed.

[0065] Step SA12: Use the original first laser terminal as the latest second laser terminal, and use the original second laser terminal as the latest first laser terminal; and repeat steps SA3 to SA11.

[0066] The above step SA is specifically described as a whole using an embodiment below. The table mentioned in this embodiment refers to the first preset table in the following text.

[0067] Exemplarily, the steps of the signal light tracking test in this application are as follows:

[0068] (1) Align laser terminal A and laser terminal B with the optical axis of the collimator on the test platform.

[0069] (2) Adjust the attenuation value of the link and the signal light transmission power of laser terminal A and laser terminal B so that the signal light power received by the entrance pupil of laser terminal A and laser terminal B reaches the specified optical power value.

[0070] (3) Inject a link establishment planning table into the laser high-speed processor, and set the elements as follows: the transmitting signal laser of laser terminal A is set to transmit Xnm left-handed polarization state and receive Ynm right-handed polarization state; the transmitting signal laser of laser terminal B is set to transmit Ynm right-handed polarization state and receive Xnm left-handed polarization state.

[0071] (4) According to the current test project, set the initial bias values ​​of the two laser terminals according to the table, and start the corresponding test conditions for simulation.

[0072] (5) According to the capture and tracking process requirements, laser terminal A starts scanning and laser terminal B starts staring. The monitoring camera of the test platform monitors the scanning status of laser terminal A and starts timing from the start of scanning.

[0073] (6) When laser terminal B receives the signal light from laser terminal A, it automatically adjusts its own direction according to the tracking process so that its signal light is aimed at laser terminal A.

[0074] (7) When laser terminal A receives the signal light from laser terminal B, it stops scanning according to the tracking process and automatically adjusts its own direction so that its signal light is aimed at laser terminal B; the two laser terminals stably track each other's signal light within their own coherent fine tracking field of view, or the coherent fine tracking detector continues to detect the light signal; switch to the coherent fine tracking mode, if the coherent fine tracking accuracy meets the requirements, the timing value read at this time is the capture time.

[0075] (8) When the coherent tracking accuracy of laser terminals A and B meets the requirements and is maintained for a period of T1 (tentatively set at 5 seconds), a capture-to-communication request is sent to the laser high-speed processor according to the link establishment process, and the signal light intensity modulation is switched to BPSK (Binary Phase Shift Keying) modulation with a fixed data sequence.

[0076] (9) The laser high-speed processor receives the BPSK modulated signal of the fixed data sequence, starts the signal light frequency capture and phase locking, completes the correct demodulation of the fixed data, and the link has the conditions for measuring communication. The link establishment process is completed, and the read timing value is the link establishment time. The two timing results are filled in the table.

[0077] (10) Laser terminals A and B maintain the coherent precision tracking mode for 60 seconds, store the monitoring images of the full-band surveillance cameras at both ends, and process the coherent precision tracking accuracy at both ends and fill in the table.

[0078] (11) Change the test condition simulation and the initial bias values ​​of the two laser terminals according to the table, and repeat steps (5) to (10) until all the test items and test condition simulations in the table are traversed.

[0079] (12) Swap the roles of A and B of the test equipment, repeat steps (3) to (11), and record the data.

[0080] The first preset table, wireless docking signal light capture and test project arrangement

[0081]

[0082] In step SB, a beacon light tracking and communication ranging test is performed. Exemplarily, by performing the beacon light tracking and communication ranging test, it can be ensured that the laser intersatellite link can maintain a stable connection and accurate distance measurement in long-distance communication.

[0083] In some embodiments, performing beacon light tracking and communication ranging tests includes:

[0084] Step SB1: Control the first laser terminal to align with the optical axis of the first collimator, and control the second laser terminal to align with the optical axis of the second collimator.

[0085] Step SB2: adjust the attenuation value of the laser intersatellite link, adjust the beacon light transmission power and signal light transmission power of the first laser terminal, adjust the beacon light transmission power and signal light transmission power of the second laser terminal, so that the beacon light power and signal light power received by the entrance pupil reach the preset light power value.

[0086] Step SB3: Inject the second link establishment planning table into the laser high-speed processor, the elements of the second link establishment planning table include: the transmitting signal laser of the first laser terminal is to transmit Xnm left-handed polarization state, receive Ynm right-handed polarization state, the sinusoidal intensity modulation frequency is the first preset frequency, and the Znm beacon light is turned on; the transmitting signal laser of the second laser terminal is to transmit Ynm right-handed polarization state, receive Xnm left-handed polarization state, the sinusoidal intensity modulation frequency is the second preset frequency, and the Znm beacon light is turned on.

[0087] Step SB4: Set the initial bias value of the first laser terminal and the initial bias value of the second laser terminal according to the second preset table (see below), and perform the test condition simulation in the second preset table.

[0088] Step SB5: Control the first laser terminal to start scanning, control the second laser terminal to start staring, monitor the scanning status of the first laser terminal, and start timing from the start of scanning.

[0089] Step SB6: In response to the second laser terminal receiving the beacon light of the first laser terminal, the second laser terminal automatically adjusts its own direction so that the beacon light of the second laser terminal is aimed at the first laser terminal.

[0090] Step SB7: In response to the first laser terminal receiving the beacon light of the second laser terminal, the first laser terminal is controlled to stop scanning, and the first laser terminal automatically adjusts its own direction so that the beacon light of the first laser terminal is aimed at the second laser terminal; the first laser terminal and the second laser terminal stably track each other's beacon light within the signal light precise tracking field of view; switch to signal light precise tracking.

[0091] Step SB8: In response to continuous detection of the light signal, switch to the coherent fine tracking mode; in response to the coherent fine tracking accuracy meeting the preset accuracy, read the current timing value to obtain the capture time.

[0092] Step SB9: Wait for the third preset time length, send a capture-to-communication request to the laser high-speed processor according to the preset link establishment process, and switch the signal light intensity modulation to BPSK modulation of a fixed data sequence.

[0093] Step SB10: In response to the capture-to-communication request, the laser high-speed processor performs signal light frequency capture and phase locking, thereby demodulating the fixed data sequence and completing the link establishment, and reading the current timing value to obtain the link establishment time.

[0094] Step SB11: The first laser terminal and the second laser terminal maintain the coherent precise tracking mode for the fourth preset time and turn off the beacon light; estimate the tracking stability of the first laser terminal and the second laser terminal based on the monitoring image of the surveillance camera to obtain the latest coherent precise tracking accuracy of the first laser terminal and the second laser terminal.

[0095] Step SB12: In the comprehensive dynamic simulation tracking test in the second preset table, N two-way communication ranging tests are selected, each test is for the fifth preset duration, and the bit error rate and ranging random error are statistically analyzed; wherein N is an integer greater than or equal to 1.

[0096] Step SB13: reset the initial bias value of the first laser terminal and the initial bias value of the second laser terminal according to the second preset table, and re-execute the test condition simulation in the second preset table; repeat steps SB5 to SB12 until the test items and test condition simulations in the second preset table are completely traversed.

[0097] Step SB14: Use the original first laser terminal as the latest second laser terminal, and use the original second laser terminal as the latest first laser terminal; repeat steps SB3 to SB13.

[0098] The above step SB is specifically described as a whole using an embodiment. In this embodiment, the table refers to the second preset table.

[0099] Exemplarily, the steps of the beacon light tracking and communication ranging test in this application are as follows:

[0100] (1) Align laser terminal A and laser terminal B with the optical axis of the collimator on the test platform.

[0101] (2) Adjust the attenuation value of the link and the beacon light transmission power and signal light transmission power of laser terminal A and laser terminal B so that the beacon light transmission power and signal light power received by the entrance pupils of laser terminal A and laser terminal B reach the specified optical power values.

[0102] (3) Inject the link establishment planning table into the laser high-speed processor, and set the elements as follows: the transmitting signal laser of laser terminal A is set to transmit Xnm left-handed polarization state, receive Ynm right-handed polarization state, set the sinusoidal intensity modulation frequency to 1MHz, and turn on the Znm beacon light; the transmitting signal laser of laser terminal B is set to transmit Ynm right-handed polarization state, receive Xnm left-handed polarization state, set the sinusoidal intensity modulation frequency to 1.7MHz, and turn on the Znm beacon light.

[0103] (4) Set the initial bias values ​​of the two laser terminals and start the corresponding test condition simulation in the table.

[0104] (5) According to the capture and tracking process requirements, laser terminal A starts scanning and laser terminal B starts staring. The monitoring camera on the test platform monitors the scanning status of laser terminal A and starts timing from the start of scanning.

[0105] (6) When laser terminal B receives the beacon light from laser terminal A, it automatically adjusts its own direction according to the tracking process so that its beacon light is aimed at laser terminal A.

[0106] (7) When laser terminal A receives the beacon light from laser terminal B, it stops scanning according to the tracking process and automatically adjusts its own direction so that its beacon light is aimed at laser terminal B; the two laser terminals stably track each other's beacon light within the signal light precision tracking field of view and switch to signal light precision tracking.

[0107] (8) When the coherent fine tracking detector continuously detects the light signal, it switches to the coherent fine tracking mode. When the coherent fine tracking accuracy meets the requirements, the timing value read at this time is the capture time.

[0108] (9) When the coherent tracking accuracy of laser terminals A and B meets the requirements and is maintained for a period of T1 (tentatively set at 5 seconds), a capture-to-communication request is sent to the laser high-speed processor according to the link establishment process, and the signal light intensity modulation is switched to BPSK modulation with a fixed data sequence.

[0109] (10) The laser high-speed processor receives the BPSK modulated signal of the fixed data sequence, starts the signal light frequency capture and phase locking, completes the correct demodulation of the fixed data, and the link has the conditions for measuring communication. The link establishment process is completed, and the timing value read is the link establishment time. The two timing results are filled in the table.

[0110] (11) Laser terminals A and B maintain the coherent fine tracking mode for 60 seconds, turn off the beacon light, evaluate the tracking stability of the two laser terminals based on the images monitored by the full-band surveillance cameras at both ends, and process the coherent fine tracking accuracy at both ends and fill in the table.

[0111] (12) In the comprehensive dynamic simulation tracking test, three two-way communication ranging tests were carried out, each lasting 5 minutes. The bit error rate and ranging random error were statistically recorded and filled in the record table.

[0112] (13) Change the test condition simulation and the initial bias values ​​of the two laser terminals according to the table, and repeat steps (5) to (12) until all the test items and test condition simulations in the table are completed (a total of 12 tests).

[0113] (14) Swap the roles of A and B of the test devices at both ends, repeat steps (3) to (13), and record the data.

[0114] Second preset table, wireless docking beacon light tracking and communication ranging test project arrangement

[0115]

[0116] In step SC, a beacon light hopping tracking test is performed. Exemplarily, by performing the beacon light hopping tracking test, the adaptability of the laser intersatellite link to dynamic changes can be verified, ensuring that it can cope with various emergencies in actual operation and maintain the stability of the link.

[0117] In some embodiments, performing a beacon light hopping tracking test includes:

[0118] Step SC1: Control the first laser terminal to align with the optical axis of the first collimator, and control the second laser terminal to align with the optical axis of the second collimator.

[0119] Step SC2: adjust the attenuation value of the laser intersatellite link, adjust the beacon light transmission power and signal light transmission power of the first laser terminal, adjust the beacon light transmission power and signal light transmission power of the second laser terminal, so that the beacon light power and signal light power received by the entrance pupil reach the preset light power value.

[0120] Step SC3: Inject the third link establishment planning table into the laser high-speed processor, the elements of the third link establishment planning table include: the transmitting signal laser of the first laser terminal is to transmit Xnm left-handed polarization state, receive Ynm right-handed polarization state, the sinusoidal intensity modulation frequency is the third preset frequency, and the Znm beacon light is turned on; the transmitting signal laser of the second laser terminal is to transmit Ynm right-handed polarization state, receive Xnm left-handed polarization state, the sinusoidal intensity modulation frequency is the fourth preset frequency, and the Znm beacon light is turned on.

[0121] Step SC4: setting the initial bias value of the first laser terminal and the initial bias value of the second laser terminal according to the third preset table (see below), and performing sinusoidal micro-vibration simulation.

[0122] Step SC5: Control the first laser terminal to start scanning, control the second laser terminal to start staring, monitor the scanning status of the first laser terminal, and count from the start of scanning.

[0123] Step SC6: In response to the second laser terminal not receiving the beacon light of the first laser terminal after the gaze time reaches the preset skipping period; skip to the next gaze point according to the sequence of gaze point coordinates in the third preset table and continue to gaze.

[0124] Step SC7: The first laser terminal continues to scan and cover the uncertain area.

[0125] Step SC8: In response to the current timing value reaching the sixth preset time length, and neither the second laser terminal nor the first laser terminal receives the beacon light of the other party; the first laser terminal is controlled to stop scanning.

[0126] Step SC9: In response to the second laser terminal receiving the beacon light of the first laser terminal, the second laser terminal automatically adjusts its own direction so that the beacon light of the second laser terminal is aimed at the first laser terminal.

[0127] Step SC10: In response to the first laser terminal receiving the beacon light of the second laser terminal, the first laser terminal is controlled to stop scanning, and the first laser terminal automatically adjusts its own direction so that the beacon light of the first laser terminal is aimed at the second laser terminal; the first laser terminal and the second laser terminal stably track each other's beacon light within the signal light precise tracking field of view; switch to signal light precise tracking.

[0128] Step SC11: In response to continuous detection of the light signal, switching to the coherent fine tracking mode; in response to the coherent fine tracking accuracy meeting the preset accuracy, reading the current timing value to obtain the capture time.

[0129] Step SC12: Wait for the seventh preset time length, send a capture-to-communication request to the laser high-speed processor according to the preset link establishment process, and switch the signal light intensity modulation to BPSK modulation of a fixed data sequence.

[0130] Step SC13: In response to the capture-to-communication request, the laser high-speed processor performs signal light frequency capture and phase locking, thereby demodulating the fixed data sequence and completing link establishment, and reading the current timing value to obtain the link establishment time.

[0131] Step SC14: The first laser terminal and the second laser terminal maintain the coherent precise tracking mode for the eighth preset time and turn off the beacon light; estimate the tracking stability of the first laser terminal and the second laser terminal based on the monitoring image of the surveillance camera to obtain the latest coherent precise tracking accuracy of the first laser terminal and the second laser terminal.

[0132] Step SC15: reset the initial bias value of the first laser terminal and the initial bias value of the second laser terminal according to the third preset table; repeat steps SC5 to SC13 until all test parameters in the third preset table are completely traversed.

[0133] Step SC16: Use the original first laser terminal as the latest second laser terminal, and use the original second laser terminal as the latest first laser terminal; and repeat steps SC3 to SC14.

[0134] The above step SC is specifically described as a whole using an embodiment below. The table mentioned in this embodiment refers to the third preset table.

[0135] Exemplarily, the beacon light jump tracking test verifies the correctness of the jump tracking strategy and the matching of the two ends under the condition of sinusoidal micro-vibration simulation (frequency XHz, amplitude Xμrad). In the test project, the uncertainty area is 5mrad and the jump sub-area is Fmrad. The initial offset of both ends, the scanning center and radius of the A end, the gaze sequence jump point of the B end and other related parameters are set as shown in the third preset table below. At the same time, the single scan coverage period and jump period of the Fmrad uncertainty area are set to Ts.

[0136] Exemplarily, the steps of the beacon light hopping tracking test in this application are as follows:

[0137] (1) Align laser terminal A and laser terminal B with the optical axis of the collimator on the test platform.

[0138] (2) Adjust the attenuation value of the link and the beacon light transmission power and signal light transmission power of laser terminal A and laser terminal B so that the beacon light power and signal light power received by the entrance pupils of laser terminal A and laser terminal B reach the specified light power values.

[0139] (3) Inject the link establishment planning table into the laser high-speed processor, and set the elements as follows: the signal laser of laser terminal A is set to transmit Xnm left-handed polarization state, receive Ynm right-handed polarization state, set the sinusoidal intensity modulation frequency to 1MHz, and turn on the Znm beacon light; the signal laser of laser terminal B is set to transmit Ynm right-handed polarization state, receive Xnm left-handed polarization state, set the sinusoidal intensity modulation frequency to XMHz, and turn on the Znm beacon light.

[0140] (4) According to the current test project, set the initial bias values ​​of the two laser terminals according to the table and start the sinusoidal micro-vibration simulation (frequency X Hz, amplitude X μrad).

[0141] (5) According to the capture and tracking process requirements, laser terminal A starts scanning and laser terminal B starts staring. The monitoring camera on the test platform monitors the scanning status of laser terminal A and starts timing from the start of scanning.

[0142] (6) If the laser terminal B still does not receive the beacon light from the laser terminal A after the gaze time reaches a jump period Ts, it will jump to the next gaze point in the order of the gaze point coordinates listed in the table and continue to gaze.

[0143] (7) Laser terminal A continues to scan and cover the uncertain area according to the initial offset position.

[0144] (8) If the timing value reaches 10Ts and laser terminal B has not received the beacon light from laser terminal A, or laser terminal A has not received the beacon light from laser terminal B, scanning stops and the test fails.

[0145] (9) When laser terminal B receives the beacon light from laser terminal A, it automatically adjusts its own direction according to the tracking process so that its beacon light is aimed at laser terminal A.

[0146] (10) When laser terminal A receives the beacon light from laser terminal B, it stops scanning according to the tracking process and automatically adjusts its own direction so that its beacon light is aimed at laser terminal B; the two laser terminals stably track each other's beacon light within the signal light precision tracking field of view and switch to signal light precision tracking.

[0147] (11) When the coherent fine tracking detector continuously detects the light signal, it switches to the coherent fine tracking mode. The fine tracking accuracy meets the requirements. The timing value read at this time is the capture time, which is entered into the record table.

[0148] (12) When the coherent tracking accuracy of laser terminals A and B meets the requirements and is maintained for a period of T1 (tentatively set at 5 seconds), a capture-to-communication request is sent to the laser high-speed processor according to the link establishment process, and the signal light intensity modulation is switched to BPSK modulation with a fixed data sequence.

[0149] (13) The laser high-speed processor receives the BPSK modulated signal of the fixed data sequence, starts the signal light frequency capture and phase locking, completes the correct demodulation of the fixed data, and the link has the conditions for measuring communication. The link establishment process is completed, and the read timing value is the link establishment time. The two timing results are filled in the table.

[0150] (14) Laser terminals A and B maintain the coherent precision tracking mode for 60 seconds, turn off the beacon light, evaluate the tracking stability of the two laser terminals based on the images monitored by the full-band surveillance cameras at both ends, and process the tracking accuracy of both ends and fill in the table.

[0151] (15) Change the initial bias values ​​of the two laser terminals according to the table and repeat steps (5) to (13) until the six states in the table are traversed.

[0152] (16) Swap the roles of A and B of the test devices at both ends, repeat steps (3) to (14), and record the data.

[0153] The third preset table, wireless docking beacon light scanning staring jump step tracking test parameter settings

[0154]

[0155] In step SD, a link break recapture test is performed. By way of example, the recovery capability of the laser intersatellite link after link interruption can be evaluated by performing a link break recapture test, ensuring that the system can quickly recapture and reestablish the link when encountering external interference or failure, thereby ensuring the continuity of communication.

[0156] In some embodiments, a chain breakage-recapture test is performed, comprising:

[0157] Step SD1: Control the first laser terminal to align with the optical axis of the first collimator, and control the second laser terminal to align with the optical axis of the second collimator.

[0158] Step SD2: adjust the attenuation value of the laser intersatellite link, adjust the signal light transmission power of the first laser terminal, and adjust the signal light transmission power of the second laser terminal, so that the signal light power received by the entrance pupil reaches a preset optical power value.

[0159] Step SD3: Execute the test condition simulation in the fourth preset table.

[0160] Step SD4: Inject the fourth link establishment planning table into the laser high-speed processor. The elements of the fourth link establishment planning table include: the transmitting signal laser of the first laser terminal transmits Xnm left-handed polarization state and receives Ynm right-handed polarization state; the transmitting signal laser of the second laser terminal transmits Ynm right-handed polarization state and receives Xnm left-handed polarization state.

[0161] Step SD5: Control the first laser terminal to start scanning, control the second laser terminal to start staring, and monitor the scanning status of the first laser terminal.

[0162] Step SD6: In response to the second laser terminal receiving the signal light from the first laser terminal, the second laser terminal automatically adjusts its own direction so that the signal light from the second laser terminal is aimed at the first laser terminal.

[0163] Step SD7: In response to the first laser terminal receiving the signal light of the second laser terminal, the first laser terminal is controlled to stop scanning, and the first laser terminal automatically adjusts its own direction so that the signal light of the first laser terminal is aimed at the second laser terminal; the first laser terminal and the second laser terminal stably track each other's signal light within their own coherent precise tracking field of view, or in response to continuous detection of optical signals; switch to coherent precise tracking mode.

[0164] Step SD8: In response to the coherent tracking accuracy meeting the preset accuracy, wait for the ninth preset time length; send a capture-to-communication request to the laser high-speed processor according to the preset link establishment process, and switch the signal light intensity modulation to BPSK modulation of a fixed data sequence.

[0165] Step SD9: In response to the capture-to-communication request, the laser high-speed processor performs signal light frequency capture and phase locking, thereby demodulating the fixed data sequence and completing the link establishment.

[0166] Step SD10: Block the spatial optical path and start timing to interrupt the tracking link between the first laser terminal and the second laser terminal; send a recapture request to the laser high-speed processor and record the current time.

[0167] Step SD11: The laser high-speed processor changes the signal light modulation into intensity modulation and re-issues the link establishment capture parameters; repeats steps SD5 to SD9 M times according to the link establishment capture parameters, and records the link re-establishment time; wherein M is an integer greater than or equal to 1.

[0168] Step SD12: the original first laser terminal is used as the latest second laser terminal, and the original second laser terminal is used as the latest first laser terminal; and steps SD3 to SD11 are repeatedly executed.

[0169] The above step SD is specifically described as a whole using an embodiment below. The table mentioned in this embodiment refers to the fourth preset table mentioned later.

[0170] Exemplarily, the steps of chain breakage and recapture test in this application are as follows:

[0171] (1) Align laser terminal A and laser terminal B with the optical axis of the collimator on the test platform.

[0172] (2) Adjust the attenuation value of the link and the signal light transmission power of laser terminal A and laser terminal B so that the signal light power received by the entrance pupil of laser terminal A and laser terminal B reaches the specified optical power value.

[0173] (3) This project does not set the initial bias value, and starts the corresponding test condition simulation in the fourth preset table.

[0174] (4) Inject a link establishment planning table into the laser high-speed processor, and set the elements as follows: the transmitting signal laser of laser terminal A is set to transmit Xnm left-handed polarization state and receive Ynm right-handed polarization state; the transmitting signal laser of laser terminal B is set to transmit Ynm right-handed polarization state and receive Xnm left-handed polarization state.

[0175] (5) According to the capture and tracking process requirements, laser terminal A starts scanning, laser terminal B starts staring, and the test platform monitoring camera monitors the scanning status of laser terminal A.

[0176] (6) When laser terminal B receives the signal light from laser terminal A, it automatically adjusts its own direction according to the tracking process so that its signal light is aimed at laser terminal A.

[0177] (7) When laser terminal A receives the signal light from laser terminal B, it stops scanning according to the tracking process and automatically adjusts its own direction so that its signal light is aimed at laser terminal B. The two laser terminals stably track each other's signal light within their own coherent fine tracking field of view, or switch to the coherent fine tracking mode when the coherent fine tracking detector continues to detect the optical signal.

[0178] (8) When the coherent tracking accuracy of laser terminals A and B meets the requirements and is maintained for a period of T1 (tentatively set at 5 seconds), a capture-to-communication request is sent to the laser high-speed processor according to the link establishment process, and the signal light intensity modulation is switched to BPSK modulation with a fixed data sequence.

[0179] (9) The laser high-speed processor receives the BPSK modulated signal of the fixed data sequence, starts the signal light frequency capture and phase locking, completes the correct demodulation of the fixed data, and the link has the measurement communication conditions, and the link establishment process is completed.

[0180] (10) Manually disconnect the test platform fiber connection or block the spatial optical path and start timing, causing the laser terminal to fail in precise tracking and the tracking link to be interrupted. The laser terminal sends a recapture request to the laser high-speed processor according to the recapture process and records the time.

[0181] (11) The laser high-speed processor changes the signal light modulation into intensity modulation according to the process and re-issues the link establishment capture parameters; the laser terminal starts to re-perform the capture process (5) to (9) according to the issued link establishment capture parameters, records the link re-establishment time, and repeats it 3 times.

[0182] (12) Swap the roles of A and B of the test equipment, repeat steps (3) to (11), and record the data.

[0183] Fourth preset table and / or fifth preset table, wireless connection disconnection recapture test record

[0184]

[0185] In step SE, a long-term link establishment test is performed. Exemplarily, by performing a long-term link establishment test, the stability and reliability of the laser intersatellite link under long-term operation can be verified to ensure that the laser intersatellite link can continuously and stably provide communication services.

[0186] In some embodiments, a long-term link building assessment test is performed, including:

[0187] Step SE1: Control the first laser terminal to align with the optical axis of the first collimator, and control the second laser terminal to align with the optical axis of the second collimator.

[0188] Step SE2: adjust the attenuation value of the laser intersatellite link, adjust the signal light transmission power of the first laser terminal, and adjust the signal light transmission power of the second laser terminal, so that the signal light power received by the entrance pupil reaches a preset optical power value.

[0189] Step SE3: Execute the test condition simulation in the fifth preset table.

[0190] Step SE4: Inject the fifth link establishment planning table into the laser high-speed processor. The elements of the fifth link establishment planning table include: the transmitting signal laser of the first laser terminal transmits Xnm left-handed polarization state and receives Ynm right-handed polarization state; the transmitting signal laser of the second laser terminal transmits Ynm right-handed polarization state and receives Xnm left-handed polarization state.

[0191] Step SE5: Control the first laser terminal to start scanning, control the second laser terminal to start staring, and monitor the scanning status of the first laser terminal.

[0192] Step SE6: In response to the second laser terminal receiving the signal light from the first laser terminal, the second laser terminal automatically adjusts its own direction so that the signal light from the second laser terminal is aimed at the first laser terminal.

[0193] Step SE7: In response to the first laser terminal receiving the signal light of the second laser terminal, the first laser terminal is controlled to stop scanning, and the first laser terminal automatically adjusts its own direction so that the signal light of the first laser terminal is aimed at the second laser terminal; the first laser terminal and the second laser terminal stably track each other's signal light within their own coherent precise tracking field of view, or in response to continuous detection of optical signals; switch to coherent precise tracking mode.

[0194] Step SE8: In response to the coherent tracking accuracy meeting the preset accuracy, wait for the tenth preset time period; send a capture-to-communication request to the laser high-speed processor according to the preset link establishment process, and switch the signal light intensity modulation to BPSK modulation of a fixed data sequence.

[0195] Step SE9: In response to the capture-to-communication request, the laser high-speed processor performs signal light frequency capture and phase locking, thereby demodulating the fixed data sequence and completing the link establishment.

[0196] Step SE10: Control the micro-vibration simulation galvanometer to generate micro-vibration; wherein the micro-vibration satisfies a fifth preset frequency and a preset amplitude.

[0197] Step SE11: Control the turntable to rotate so as to simulate the satellite attitude; wherein the attitude change rate of the satellite attitude can cover the preset tracking angular rate.

[0198] Step SE12: Continuously test for an eleventh preset time period, and record the number of link establishment interruptions and the number of successful recaptures of the first laser terminal and the second laser terminal.

[0199] Step SE13: In response to the failure of automatic recapture after the link establishment and tracking interruption, the laser intersatellite link is reestablished until the accumulated test time reaches the eleventh preset time.

[0200] The above step SE is specifically described as a whole using an embodiment below. The table mentioned in this embodiment refers to the fifth preset table shown above. The fourth preset table and the fifth preset table can be set to be the same or different, and this application does not limit it.

[0201] Exemplarily, the steps of chain breakage and recapture test in this application are as follows:

[0202] (1) Align laser terminal A and laser terminal B with the optical axis of the collimator on the test platform.

[0203] (2) Adjust the attenuation value of the link and the signal light transmission power of laser terminal A and laser terminal B so that the entrance pupil received signal light power of laser terminal A and laser terminal B reaches the specified light power value.

[0204] (3) This project does not set the initial bias value, and starts the corresponding test condition simulation in the fifth preset table.

[0205] (4) Inject a link establishment planning table into the laser high-speed processor, and set the elements as follows: the transmitting signal laser of laser terminal A is set to transmit Xnm left-handed polarization state and receive Ynm right-handed polarization state; the transmitting signal laser of laser terminal B is set to transmit Ynm right-handed polarization state and receive Xnm left-handed polarization state.

[0206] (5) According to the capture and tracking process requirements, laser terminal A starts scanning, laser terminal B starts staring, and the test platform monitoring camera monitors the scanning status of laser terminal A.

[0207] (6) When laser terminal B receives the signal light from laser terminal A, it automatically adjusts its own direction according to the tracking process so that its signal light is aimed at laser terminal A.

[0208] (7) When laser terminal A receives the signal light from laser terminal B, it stops scanning according to the tracking process and automatically adjusts its own direction so that its signal light is aimed at laser terminal B. The two laser terminals stably track each other's signal light within their own coherent precision tracking field of view, or when the coherent precision tracking detector continues to detect the optical signal, they switch to the coherent precision tracking mode.

[0209] (8) When the coherent tracking accuracy of laser terminals A and B meets the requirements and is maintained for a period of T1 (tentatively set at 5 seconds), a capture-to-communication request is sent to the laser high-speed processor according to the link establishment process, and the signal light intensity modulation is switched to BPSK modulation with a fixed data sequence.

[0210] (9) The laser high-speed processor receives the BPSK modulated signal of the fixed data sequence, starts the signal light frequency capture and phase locking, completes the correct demodulation of the fixed data, and the link has the measurement communication conditions, and the link establishment process is completed.

[0211] (10) Turn on the galvanometer to simulate the micro-vibration of the platform. The micro-vibration conditions are frequency X Hz and amplitude Xurad.

[0212] (11) Turn on the turntable to simulate the satellite attitude, and the attitude change rate covers the maximum tracking angular rate of X° / s.

[0213] (12) Continue for 12 hours and record the number of link interruptions and successful recaptures at each terminal.

[0214] (13) If automatic recapture fails after link establishment and tracking is interrupted, the link must be manually reestablished for a cumulative test time of 12 hours.

[0215] In step F, one or any combination of the capture time, link establishment time, coherent tracking accuracy, bit error rate, ranging random error, link re-establishment time, link establishment interruption times, and re-capture success times of the laser inter-satellite link is obtained.

[0216] The technical solution of the present application can simulate various working modes and working conditions of satellite laser intersatellite links during their in-orbit operation by constructing a laser intersatellite link test system; by performing signal light acquisition and tracking tests, beacon light acquisition and communication ranging tests, beacon light step-by-step acquisition and tracking tests, link breakage and re-acquisition tests, and long-term link establishment assessment tests, it is possible to verify the working modes and performance of laser intersatellite links under various working conditions on the ground; based on the parameters obtained from various tests, problems with the laser intersatellite link can be effectively discovered, the reliability of the test can be improved, and the risk of in-orbit communication of the satellite laser intersatellite link can be reduced.

[0217] The present application also includes a laser intersatellite link test device, including a memory and a processor, wherein the memory is used to store instructions executable by the processor; and the processor is used to execute the instructions to implement the laser intersatellite link test method described above.

[0218] Figure 5 1 is a system block diagram of a laser intersatellite link test device according to an embodiment of the present application. Figure 5As shown, the laser intersatellite link test device 500 may include an internal communication bus 501, a processor 502, a read-only memory (ROM) 503, a random access memory (RAM) 504, and a communication port 505. The laser intersatellite link test device 500 may also include a hard disk 506. The internal communication bus 501 can realize data communication between the components of the laser intersatellite link test device 500. The processor 502 can make judgments and issue prompts. In some embodiments, the processor 502 can be composed of one or more processors. The communication port 505 can realize data communication between the laser intersatellite link test device 500 and the outside. In some embodiments, the laser intersatellite link test device 500 can send and receive information and data from the network through the communication port 505. The laser intersatellite link test device 500 may also include different forms of program storage units and data storage units, such as a hard disk 506, a read-only memory (ROM) 503 and a random access memory (RAM) 504, which can store various data files used for computer processing and / or communication, and possible program instructions executed by the processor 502. The processor executes these instructions to implement the main part of the method. The result processed by the processor is transmitted to the user device through the communication port and displayed on the user interface.

[0219] The above-mentioned laser inter-satellite link testing method can be implemented as a computer program, stored in the hard disk 506, and loaded into the processor 502 for execution to implement the laser inter-satellite link testing method of the present application.

[0220] The present application also includes a computer-readable medium storing a computer program code, which, when executed by a processor, implements the laser intersatellite link testing method described above.

[0221] When the laser intersatellite link test method is implemented as a computer program, it can also be stored in a computer-readable storage medium as a product. For example, a computer-readable storage medium may include, but is not limited to, a magnetic storage device (e.g., a hard disk, a floppy disk, a magnetic strip), an optical disk (e.g., a compact disk (CD), a digital versatile disk (DVD)), a smart card, and a flash memory device (e.g., an electrically erasable programmable read-only memory (EPROM), a card, a stick, a key drive). In addition, the various storage media described herein can represent one or more devices and / or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media (and / or storage media) that can store, contain and / or carry code and / or instructions and / or data.

[0222] It should be understood that the embodiments described above are only illustrative. The embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof. For hardware implementation, the processor may be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and / or other electronic units designed to perform the functions described herein, or a combination thereof.

[0223] Some aspects of the present application may be performed entirely by hardware, entirely by software (including firmware, resident software, microcode, etc.), or by a combination of hardware and software. The above hardware or software may be referred to as "data blocks", "modules", "engines", "units", "components" or "systems". The processor may be one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DAPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, or combinations thereof. In addition, various aspects of the present application may be represented as computer products located in one or more computer-readable media, which include computer-readable program codes. For example, computer-readable media may include, but are not limited to, magnetic storage devices (e.g., hard disks, floppy disks, tapes ...), optical disks (e.g., compact disks CDs, digital versatile disks DVDs ...), smart cards, and flash memory devices (e.g., cards, sticks, key drives ...).

[0224] A computer-readable medium may include a propagated data signal containing computer program code, such as in baseband or as part of a carrier wave. The propagated signal may have a variety of manifestations, including electromagnetic, optical, etc., or a suitable combination. A computer-readable medium may be any computer-readable medium other than a computer-readable storage medium, which may be connected to an instruction execution system, device or apparatus to communicate, propagate or transmit a program for use. The program code on the computer-readable medium may be propagated via any suitable medium, including radio, cable, fiber optic cable, radio frequency signal, or similar medium, or any combination of the above mediums.

[0225] The basic concepts have been described above. Obviously, for those skilled in the art, the above application disclosure is only an example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0226] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0227] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used for the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which can be changed according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the method of general digit retention. Although the numerical domains and parameters used to confirm the breadth of the range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

Claims

1. A laser intersatellite link testing method, characterized in that: The method is used for performing a docking test on a laser intersatellite link by using a laser intersatellite link test system, wherein the laser intersatellite link test system comprises: a laser high-speed processor, a first laser terminal, a second laser terminal, a first collimator, a second collimator, a monitoring camera, a micro-vibration simulation galvanometer, and a turntable, or any combination thereof; the method comprises: Conduct signal light tracking test; Conduct beacon light tracking and communication ranging tests; Performing a beacon light hopping tracking test; during the beacon light hopping tracking test: performing a sinusoidal micro-vibration simulation; in response to the second laser terminal not receiving the beacon light of the first laser terminal after the gaze time reaches a preset hopping cycle; sequentially hopping to the next gaze point according to the sequence of gaze point coordinates in the third preset table and continuing to gaze; Conduct chain break-recapture tests; Conduct long-term chain building assessment tests; Thus, one or any combination of the capture time, link establishment time, coherent tracking accuracy, bit error rate, ranging random error, link re-establishment time, link establishment interruption times, and re-capture success times of the laser inter-satellite link is obtained.

2. The laser intersatellite link testing method according to claim 1, characterized in that: Conduct signal light tracking test, including: Step SA1: controlling the first laser terminal to align with the optical axis of the first collimator, and controlling the second laser terminal to align with the optical axis of the second collimator; Step SA2: adjusting the attenuation value of the laser intersatellite link, adjusting the signal light transmission power of the first laser terminal, and adjusting the signal light transmission power of the second laser terminal, so that the signal light power received by the entrance pupil reaches a preset optical power value; Step SA3: injecting a first link establishment planning table into the laser high-speed processor, wherein the elements of the first link establishment planning table include: the transmitting signal laser of the first laser terminal transmits a left-handed polarization state of Xnm and receives a right-handed polarization state of Ynm; the transmitting signal laser of the second laser terminal transmits a right-handed polarization state of Ynm and receives a left-handed polarization state of Xnm; Step SA4: setting the initial bias value of the first laser terminal and the initial bias value of the second laser terminal according to the first preset table, and executing the test condition simulation in the first preset table; Step SA5: controlling the first laser terminal to start scanning, controlling the second laser terminal to start staring, monitoring the scanning status of the first laser terminal, and timing from the start of the scanning; Step SA6: in response to the second laser terminal receiving the signal light of the first laser terminal, the second laser terminal automatically adjusts its own direction so that the signal light of the second laser terminal is aimed at the first laser terminal; Step SA7: in response to the first laser terminal receiving the signal light of the second laser terminal, the first laser terminal is controlled to stop scanning, and the first laser terminal automatically adjusts its own direction so that the signal light of the first laser terminal is aimed at the second laser terminal; the first laser terminal and the second laser terminal stably track the signal light of the other party within their own coherent precision tracking field of view, or in response to continuous detection of optical signals; switch to the coherent precision tracking mode; in response to the coherent precision tracking accuracy meeting the preset accuracy, read the current timing value to obtain the capture time; Step SA8: Wait for a first preset time length, send a capture-to-communication request to the laser high-speed processor according to a preset link establishment process, and switch the signal light intensity modulation to BPSK modulation of a fixed data sequence; Step SA9: In response to the capture-to-communication request, the laser high-speed processor performs signal light frequency capture and phase locking, thereby demodulating the fixed data sequence and completing link establishment, and reading the current timing value to obtain the link establishment time; Step SA10: the first laser terminal and the second laser terminal maintain the coherent precise tracking mode for a second preset time, store the monitoring image of the monitoring camera, and obtain the latest coherent precise tracking accuracy of the first laser terminal and the second laser terminal; Step SA11: reset the initial bias value of the first laser terminal and the initial bias value of the second laser terminal according to the first preset table, and re-execute the test condition simulation in the first preset table; repeat the steps SA5 to SA10 until the test items and test condition simulations in the first preset table are completely traversed; Step SA12: taking the original first laser terminal as the latest second laser terminal, and taking the original second laser terminal as the latest first laser terminal; and repeating the steps SA3 to SA11.

3. The laser intersatellite link testing method according to claim 1, characterized in that: Conduct beacon light tracking and communication ranging tests, including: Step SB1: controlling the first laser terminal to align with the optical axis of the first collimator, and controlling the second laser terminal to align with the optical axis of the second collimator; Step SB2: adjusting the attenuation value of the laser intersatellite link, adjusting the beacon light transmission power and the signal light transmission power of the first laser terminal, and adjusting the beacon light transmission power and the signal light transmission power of the second laser terminal, so that the beacon light power and the signal light power received by the entrance pupil reach the preset light power value; Step SB3: injecting a second link establishment planning table into the laser high-speed processor, the elements of the second link establishment planning table include: the transmitting signal laser of the first laser terminal is to transmit Xnm left-handed polarization state, receive Ynm right-handed polarization state, the sine intensity modulation frequency is the first preset frequency, and the Znm beacon light is turned on; the transmitting signal laser of the second laser terminal is to transmit Ynm right-handed polarization state, receive Xnm left-handed polarization state, the sine intensity modulation frequency is the second preset frequency, and the Znm beacon light is turned on; Step SB4: setting the initial bias value of the first laser terminal and the initial bias value of the second laser terminal according to the second preset table, and executing the test condition simulation in the second preset table; Step SB5: controlling the first laser terminal to start scanning, controlling the second laser terminal to start staring, monitoring the scanning status of the first laser terminal, and timing from the start of the scanning; Step SB6: In response to the second laser terminal receiving the beacon light of the first laser terminal, the second laser terminal automatically adjusts its own direction so that the beacon light of the second laser terminal is aimed at the first laser terminal; Step SB7: in response to the first laser terminal receiving the beacon light of the second laser terminal, the first laser terminal is controlled to stop scanning, and the first laser terminal automatically adjusts its own direction so that the beacon light of the first laser terminal is aimed at the second laser terminal; the first laser terminal and the second laser terminal stably track the beacon light of each other within the signal light precision tracking field of view; switch to signal light precision tracking; Step SB8: In response to continuous detection of the optical signal, switching to the coherent fine tracking mode; in response to the coherent fine tracking accuracy meeting the preset accuracy, reading the current timing value to obtain the capture time; Step SB9: Wait for a third preset time, send a capture-to-communication request to the laser high-speed processor according to a preset link establishment process, and switch the signal light intensity modulation to BPSK modulation of a fixed data sequence; Step SB10: In response to the capture-to-communication request, the laser high-speed processor performs signal light frequency capture and phase locking, thereby demodulating the fixed data sequence and completing link establishment, and reading the current timing value to obtain the link establishment time; Step SB11: the first laser terminal and the second laser terminal maintain the coherent precise tracking mode for a fourth preset time, and turn off the beacon light; the tracking stability of the first laser terminal and the second laser terminal is estimated according to the monitoring image of the monitoring camera, and the latest coherent precise tracking accuracy of the first laser terminal and the second laser terminal is obtained; Step SB12: In the comprehensive dynamic simulation tracking test in the second preset table, N times of two-way communication ranging test are selected, each test is for a fifth preset time, and the bit error rate and ranging random error are counted; wherein N is an integer greater than or equal to 1; Step SB13: reset the initial bias value of the first laser terminal and the initial bias value of the second laser terminal according to the second preset table, and re-execute the test condition simulation in the second preset table; repeat the steps SB5 to SB12 until the test items and test condition simulations in the second preset table are completely traversed; Step SB14: use the original first laser terminal as the latest second laser terminal, and use the original second laser terminal as the latest first laser terminal; repeat the steps SB3 to SB13.

4. The laser intersatellite link testing method according to claim 1, characterized in that: Conduct beacon light hopping tracking test, including: Step SC1: controlling the first laser terminal to align with the optical axis of the first collimator, and controlling the second laser terminal to align with the optical axis of the second collimator; Step SC2: adjusting the attenuation value of the laser intersatellite link, adjusting the beacon light transmission power and the signal light transmission power of the first laser terminal, and adjusting the beacon light transmission power and the signal light transmission power of the second laser terminal, so that the beacon light power and the signal light power received by the entrance pupil reach the preset light power value; Step SC3: injecting a third link establishment planning table into the laser high-speed processor, the elements of the third link establishment planning table including: the transmitting signal laser of the first laser terminal is to transmit Xnm left-handed polarization state, receive Ynm right-handed polarization state, the sine intensity modulation frequency is the third preset frequency, and the Znm beacon light is turned on; the transmitting signal laser of the second laser terminal is to transmit Ynm right-handed polarization state, receive Xnm left-handed polarization state, the sine intensity modulation frequency is the fourth preset frequency, and the Znm beacon light is turned on; Step SC4: setting the initial bias value of the first laser terminal and the initial bias value of the second laser terminal according to the third preset table, and performing sinusoidal micro-vibration simulation; Step SC5: controlling the first laser terminal to start scanning, controlling the second laser terminal to start staring, monitoring the scanning status of the first laser terminal, and timing from the start of the scanning; Step SC6: in response to the second laser terminal not receiving the beacon light of the first laser terminal after the gaze time reaches the preset skipping period; skip to the next gaze point according to the sequence of gaze point coordinates in the third preset table and continue to gaze; Step SC7: the first laser terminal continues to scan and cover the uncertain area; Step SC8: In response to the current timing value reaching the sixth preset time length, and neither the second laser terminal nor the first laser terminal receives the beacon light of the other party; controlling the first laser terminal to stop scanning; Step SC9: in response to the second laser terminal receiving the beacon light of the first laser terminal, the second laser terminal automatically adjusts its own direction so that the beacon light of the second laser terminal is aimed at the first laser terminal; Step SC10: in response to the first laser terminal receiving the beacon light of the second laser terminal, the first laser terminal is controlled to stop scanning, and the first laser terminal automatically adjusts its own direction so that the beacon light of the first laser terminal is aimed at the second laser terminal; the first laser terminal and the second laser terminal stably track the beacon light of each other within the signal light precision tracking field of view; switch to signal light precision tracking; Step SC11: in response to continuous detection of the light signal, switching to the coherent fine tracking mode; in response to the coherent fine tracking accuracy meeting the preset accuracy, reading the current timing value to obtain the capture time; Step SC12: wait for a seventh preset time length, send a capture-to-communication request to the laser high-speed processor according to a preset link establishment process, and switch the signal light intensity modulation to BPSK modulation of a fixed data sequence; Step SC13: In response to the capture-to-communication request, the laser high-speed processor performs signal light frequency capture and phase locking, thereby demodulating the fixed data sequence and completing link establishment, and reading the current timing value to obtain the link establishment time; Step SC14: the first laser terminal and the second laser terminal maintain the coherent fine tracking mode for an eighth preset time, and turn off the beacon light; the tracking stability of the first laser terminal and the second laser terminal is estimated according to the monitoring image of the monitoring camera, and the latest coherent fine tracking accuracy of the first laser terminal and the second laser terminal is obtained; Step SC15: resetting the initial bias value of the first laser terminal and the initial bias value of the second laser terminal according to the third preset table; repeating the steps SC5 to SC13 until all test parameters in the third preset table are completely traversed; Step SC16: taking the original first laser terminal as the latest second laser terminal, and taking the original second laser terminal as the latest first laser terminal; and repeatedly executing steps SC3 to SC14.

5. The laser intersatellite link testing method according to claim 1, characterized in that: Conduct a chain break-recapture test, including: Step SD1: controlling the first laser terminal to align with the optical axis of the first collimator, and controlling the second laser terminal to align with the optical axis of the second collimator; Step SD2: adjusting the attenuation value of the laser intersatellite link, adjusting the signal light transmission power of the first laser terminal, and adjusting the signal light transmission power of the second laser terminal, so that the signal light power received by the entrance pupil reaches a preset optical power value; Step SD3: Execute the test condition simulation in the fourth preset table; Step SD4: injecting a fourth link establishment planning table into the laser high-speed processor, wherein the elements of the fourth link establishment planning table include: the transmitting signal laser of the first laser terminal is transmitting a left-handed polarization state of Xnm and receiving a right-handed polarization state of Ynm; the transmitting signal laser of the second laser terminal is transmitting a right-handed polarization state of Ynm and receiving a left-handed polarization state of Xnm; Step SD5: controlling the first laser terminal to start scanning, controlling the second laser terminal to start staring, and monitoring the scanning status of the first laser terminal; Step SD6: in response to the second laser terminal receiving the signal light of the first laser terminal, the second laser terminal automatically adjusts its own direction so that the signal light of the second laser terminal is aimed at the first laser terminal; Step SD7: in response to the first laser terminal receiving the signal light of the second laser terminal, the first laser terminal is controlled to stop scanning, and the first laser terminal automatically adjusts its own direction so that the signal light of the first laser terminal is aimed at the second laser terminal; the first laser terminal and the second laser terminal stably track the signal light of the other party within their own coherent precision tracking field of view, or in response to continuous detection of optical signals, switch to the coherent precision tracking mode; Step SD8: In response to the coherent fine tracking accuracy meeting the preset accuracy, waiting for the ninth preset time length; sending a capture-to-communication request to the laser high-speed processor according to the preset link establishment process, and switching the signal light intensity modulation to the BPSK modulation of the fixed data sequence; Step SD9: In response to the capture-to-communication request, the laser high-speed processor performs signal light frequency capture and phase locking, thereby demodulating the fixed data sequence and completing link establishment; Step SD10: blocking the spatial optical path and starting timing to interrupt the tracking link between the first laser terminal and the second laser terminal; sending a recapture request to the laser high-speed processor and recording the current time; Step SD11: the laser high-speed processor changes the signal light modulation into intensity modulation, and re-issues the link establishment capture parameters; repeats the steps SD5 to SD9 M times according to the link establishment capture parameters, and records the link re-establishment time; wherein M is an integer greater than or equal to 1; Step SD12: taking the original first laser terminal as the latest second laser terminal, and taking the original second laser terminal as the latest first laser terminal; and repeatedly executing steps SD3 to SD11.

6. The laser intersatellite link testing method according to claim 1, characterized in that: Conduct long-term chain building assessment tests, including: Step SE1: controlling the first laser terminal to align with the optical axis of the first collimator, and controlling the second laser terminal to align with the optical axis of the second collimator; Step SE2: adjusting the attenuation value of the laser intersatellite link, adjusting the signal light transmission power of the first laser terminal, and adjusting the signal light transmission power of the second laser terminal, so that the signal light power received by the entrance pupil reaches a preset optical power value; Step SE3: Execute the test condition simulation in the fifth preset table; Step SE4: injecting a fifth link establishment planning table into the laser high-speed processor, the elements of the fifth link establishment planning table including: the transmitting signal laser of the first laser terminal is transmitting a left-handed polarization state of Xnm and receiving a right-handed polarization state of Ynm; the transmitting signal laser of the second laser terminal is transmitting a right-handed polarization state of Ynm and receiving a left-handed polarization state of Xnm; Step SE5: controlling the first laser terminal to start scanning, controlling the second laser terminal to start staring, and monitoring the scanning status of the first laser terminal; Step SE6: In response to the second laser terminal receiving the signal light of the first laser terminal, the second laser terminal automatically adjusts its own direction so that the signal light of the second laser terminal is aimed at the first laser terminal; Step SE7: In response to the first laser terminal receiving the signal light of the second laser terminal, the first laser terminal is controlled to stop scanning, and the first laser terminal automatically adjusts its own direction so that the signal light of the first laser terminal is aimed at the second laser terminal; the first laser terminal and the second laser terminal stably track each other's signal light within their own coherent precision tracking field of view, or in response to continuous detection of optical signals, switch to the coherent precision tracking mode; Step SE8: In response to the coherent fine tracking accuracy meeting the preset accuracy, waiting for the tenth preset time length; sending a capture-to-communication request to the laser high-speed processor according to the preset link establishment process, and switching the signal light intensity modulation to BPSK modulation of a fixed data sequence; Step SE9: In response to the capture-to-communication request, the laser high-speed processor performs signal light frequency capture and phase locking, thereby demodulating the fixed data sequence and completing link establishment; Step SE10: controlling the micro-vibration simulation galvanometer to generate micro-vibration; wherein the micro-vibration satisfies a fifth preset frequency and a preset amplitude; Step SE11: Control the turntable to rotate so as to simulate the satellite attitude; wherein the attitude change rate of the satellite attitude can cover the preset tracking angular rate; Step SE12: Continuously test for an eleventh preset time period, and record the number of link establishment interruptions and the number of successful recaptures between the first laser terminal and the second laser terminal; Step SE13: In response to the failure of automatic recapture after the link establishment and tracking interruption, the laser inter-satellite link is re-established until the accumulated test time reaches the eleventh preset time.

7. A laser intersatellite link test system, characterized in that: include: The system test platform includes: an optical air-floating platform, a rotating table, a first collimator, a second collimator, a back-end optical path system, and a laser high-speed processor, or any combination thereof; The test equipment includes: one or any combination of an optical power meter, an optical reference transmitter, an oscilloscope, a laser, a first laser terminal, a second laser terminal, a monitoring camera, and a micro-vibration simulation galvanometer; Auxiliary calibration equipment, including electronic theodolite; The processor is electrically connected to the system test platform, the test equipment, and the auxiliary calibration equipment respectively, and the processor uses the laser inter-satellite link test method according to any one of claims 1 to 6 to perform a docking test on the laser inter-satellite link.

8. The laser intersatellite link test system according to claim 7, characterized in that: The back-end optical path system includes: a visible light camera, an energy spectrometer, a two-color spectrometer, an echo suppressor, an optical fiber holder, a near-infrared camera, an image processing unit, and a bidirectional adjustable gain optical power amplifier, or any combination thereof.

9. A laser intersatellite link test device, characterized in that: include: a memory for storing instructions executable by a processor; A processor is used to execute the instructions to implement the laser inter-satellite link testing method according to any one of claims 1 to 6.

10. A computer readable medium storing computer program code, characterized in that: The computer program code, when executed by a processor, implements the laser inter-satellite link testing method according to any one of claims 1 to 6.

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