Calibration method, device and system of laser communication terminal and laser communication terminal

Abstract

The present disclosure relates to a calibration method, device, system and laser communication terminal, and relates to the technical field of communication. The calibration method comprises, in the current calibration period of the first laser communication terminal: in the first time period, adjusting the coaxial degree of the first beacon light and the first signal light emitted by the first laser communication terminal, wherein the receiving power of the first signal light of the first laser communication terminal received by the second laser communication terminal reaches the peak value; in the second time period, receiving the second beacon light emitted by the second laser communication terminal, wherein the emission power of the second beacon light is determined according to the receiving power of the first beacon light received by the second laser communication terminal; and determining the adjustment mode of the first beacon light in the next calibration period of the first laser communication terminal according to the receiving power of the second beacon light.

Description

Technical Field

[0001] This disclosure relates to the field of communication technology, and in particular to a calibration method, apparatus, system and laser communication terminal for a laser communication terminal. Background Technology

[0002] In the field of space laser communication, laser communication terminals emit beacon and signal beams, and the coaxiality adjustment of the beacon and signal beams is crucial. Coaxiality is used to describe the relationship between the emitted optical axes of the beacon and signal beams. The optimal positional relationship between the emitted optical axes of the beacon and signal beams is when the signal beam's optical axis is located where the energy distribution of the beacon beam is strongest, i.e., the highest coaxiality.

[0003] In related technologies, external optical paths such as cornerstone prisms are used to reflect beacon and signal light, and then coaxiality information is fed back through internal sensors such as cameras and fiber optic power detectors. Summary of the Invention

[0004] The inventors discovered that adjusting the coaxiality of the beacon light and signal light using external optical paths such as cornerstone prisms requires interrupting communication, which cannot be performed during laser communication terminal communication.

[0005] One of the technical problems this disclosure aims to solve is: how to adjust the coaxiality of the beacon light and the signal light without interrupting the communication of the laser communication terminal, thereby improving the effective utilization rate of the communication link.

[0006] According to some embodiments of this disclosure, a calibration method for a laser communication terminal is provided, applied to a first laser communication terminal, comprising: within the current calibration cycle of the first laser communication terminal: during a first time period, adjusting the coaxiality of a first beacon light and a first signal light emitted by the first laser communication terminal, wherein the received power of the first signal light received by a second laser communication terminal reaches a peak value; during a second time period, receiving a second beacon light emitted by the second laser communication terminal, wherein the emitted power of the second beacon light is determined based on the received power of the first beacon light received by the second laser communication terminal; and determining the adjustment mode of the first beacon light in the next calibration cycle of the first laser communication terminal based on the received power of the second beacon light.

[0007] According to some other embodiments of the present disclosure, a calibration apparatus for a laser communication terminal is provided, comprising: a processor; and a memory coupled to the processor for storing instructions, which, when executed by the processor, cause the processor to perform a calibration method for a laser communication terminal as described in any embodiment of the present disclosure.

[0008] According to some other embodiments of the present disclosure, a computer-readable storage medium is provided having a computer program stored thereon, wherein the program, when executed by a processor, implements a calibration method for a laser communication terminal according to any embodiment of the present disclosure.

[0009] According to some embodiments of the present disclosure, a laser communication terminal is provided, including: a calibration device, a beacon light emitting optical path, a signal light emitting optical path, and a receiving optical path for the laser communication terminal according to any embodiment of the present disclosure.

[0010] According to some embodiments of the present disclosure, a calibration system for a laser communication terminal is provided, including a plurality of laser communication terminals as described in any embodiment of the present disclosure, wherein any two of the plurality of laser communication terminals serve as a first laser communication terminal and a second laser communication terminal.

[0011] This disclosure proposes a calibration method for a laser communication terminal. The transmission power of the second beacon light is determined based on the received power of the first beacon light received by the second laser communication terminal. The second laser communication terminal uses the transmission power of the second beacon light to indicate the received power of the first beacon light, thereby enabling the first laser communication terminal to determine the adjustment mode of the first beacon light in the next calibration cycle based on the received power of the second beacon light. The second laser communication terminal does not need to use a signal light to indicate the first laser communication terminal, does not need to occupy the communication link, and does not need to interrupt communication. The coaxiality of the first beacon light and the first signal light can be adjusted during normal communication between the first and second laser communication terminals, improving the effective utilization rate of the communication link.

[0012] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A schematic flowchart illustrating a calibration method for a laser communication terminal according to some embodiments of this disclosure is shown.

[0015] Figure 2 A schematic diagram showing the optical path structure of a laser communication terminal according to some embodiments of the present disclosure is provided.

[0016] Figure 3A flowchart illustrating a calibration method for a laser communication terminal according to other embodiments of this disclosure is shown.

[0017] Figure 4 A schematic flowchart illustrating a calibration method for a laser communication terminal according to further embodiments of this disclosure is shown.

[0018] Figure 5 A schematic diagram of the structure of a calibration device for a laser communication terminal according to some embodiments of the present disclosure is shown.

[0019] Figure 6 A schematic diagram of the structure of a calibration device for a laser communication terminal according to other embodiments of the present disclosure is shown.

[0020] Figure 7 A schematic diagram of the structure of a calibration device for a laser communication terminal according to further embodiments of the present disclosure is shown.

[0021] Figure 8 A schematic diagram of the structure of a laser communication terminal according to some embodiments of the present disclosure is shown.

[0022] Figure 9 A schematic diagram of the structure of a calibration system for a laser communication terminal according to some embodiments of the present disclosure is shown. Detailed Implementation

[0023] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0024] The beacon light beam is wider than the signal light beam; for example, the beacon light has a divergence angle of 2 mrad, while the signal light has a divergence angle of 50 mrad. When establishing a communication link between any two laser communication terminals, the narrower signal light beam allows for better alignment with the other terminal. If the coaxiality between the beacon and signal lights is low, the signal light's optical axis may be located at the edge of the beacon beam. In this case, the other laser communication terminal is also located at the edge of the beacon's coverage area, potentially leading to link breakage. Therefore, the coaxiality of the beacon and signal lights needs to be adjusted so that the signal light's optical axis is positioned where the beacon light's energy distribution is strongest, improving communication stability.

[0025] Adjusting the coaxiality of the beacon light and signal light using external optical paths such as cornerstone prisms requires interrupting communication, which cannot be performed during laser communication terminal communication.

[0026] To address the aforementioned problems, this disclosure proposes a calibration method for a laser communication terminal, applicable to a first laser communication terminal. This method allows for the gradual adjustment of the coaxiality of a first beacon light and a first signal light emitted by the first laser communication terminal over multiple calibration cycles. Within the current calibration cycle of the first laser communication terminal, in a first time period, the coaxiality of the first beacon light and the first signal light emitted by the first laser communication terminal is adjusted. In a second time period, a second beacon light emitted by a second laser communication terminal is received. Based on the received power of the second beacon light, the adjustment method for the first beacon light in the next calibration cycle of the first laser communication terminal is determined. The emitted power of the second beacon light is determined based on the received power of the first beacon light received by the second laser communication terminal. The second laser communication terminal uses the emitted power of the second beacon light to indicate the received power of the first beacon light, thereby enabling the first laser communication terminal to determine the adjustment method for the first beacon light in the next calibration cycle based on the received power of the second beacon light. The second laser communication terminal does not need to use signal light to indicate the first laser communication terminal, does not need to occupy the communication link, and does not need to interrupt communication. It can adjust the coaxiality of the first beacon light and the first signal light during normal communication between the first and second laser communication terminals, thereby improving the effective utilization rate of the communication link.

[0027] The following is combined Figures 1-4 This disclosure describes a calibration method for a laser communication terminal.

[0028] Figure 1 Flowcharts are shown for some embodiments of the calibration method for the laser communication terminal disclosed herein. For example... Figure 1 As shown, the method of this embodiment includes steps S1 to S3. This method is applied to a first laser communication terminal, which can be any laser communication terminal. Steps S1 to S3 can be executed within the current calibration cycle of the first laser communication terminal.

[0029] In step S1, during the first time period, the coaxiality of the first beacon light and the first signal light emitted by the first laser communication terminal is adjusted.

[0030] For example, in response to the arrival of the start time of the first time period, the coaxiality of the first beacon light and the first signal light emitted by the first laser communication terminal is adjusted according to the current adjustment method within the current calibration cycle. The coaxiality of the first beacon light and the first signal light emitted by the first laser communication terminal can be adjusted by adjusting the devices on the emission optical path, based on the structure of the emission optical path of the first beacon light in the first laser communication terminal.

[0031] The second laser communication terminal's reception power of the first signal light from the first laser communication terminal reaches its peak value, indicating that the first signal light is aligned with the second laser communication terminal. Alternatively, the second laser communication terminal's reception signal-to-noise ratio of the first signal light reaches its peak value, indicating that the first signal light is aligned with the second laser communication terminal. During the calibration process, the first signal light maintains its optical axis unchanged.

[0032] In step S2, during the second time period, the second beacon light emitted by the second laser communication terminal is received.

[0033] The transmission power of the second beacon light is determined based on the received power of the first beacon light received by the second laser communication terminal. The second laser communication terminal can indicate changes in the received power of the first beacon light by adjusting the transmission power of the second beacon light. For example, in response to the start of the second time period, the second laser communication terminal determines the transmission power of the second beacon light based on the changes in the received power of the first beacon light during the first time period. Then, during the second time period, the first laser communication terminal receives the second beacon light emitted by the second laser communication terminal.

[0034] In step S3, the adjustment method of the first beacon light in the next calibration cycle of the first laser communication terminal is determined based on the received power of the second beacon light.

[0035] Since the transmit power of the second beacon light can indicate changes in the receive power of the first beacon light, and the receive power of the second beacon light changes with the transmit power of the first beacon light, the first laser communication terminal can determine the changes in the receive power of the first beacon light received by the second laser communication terminal based on the receive power of the second beacon light. Because the first signal light is aligned with the second laser communication terminal and remains constant, if the receive power of the first beacon light received by the second laser communication terminal increases, it indicates that the coaxiality between the first beacon light and the first signal light has increased; conversely, it indicates that the coaxiality between the first beacon light and the first signal light has decreased. Based on this, the first laser communication terminal can determine the adjustment method of the first beacon light in the next calibration cycle.

[0036] The method described in the above embodiments can be applied to a first laser communication terminal, allowing for gradual adjustment of the coaxiality of the first beacon light and the first signal light emitted by the first laser communication terminal through multiple calibration cycles. Within the current calibration cycle of the first laser communication terminal, in a first time period, the coaxiality of the first beacon light and the first signal light emitted by the first laser communication terminal is adjusted. In a second time period, the second beacon light emitted by the second laser communication terminal is received. Based on the received power of the second beacon light, the adjustment method of the first beacon light in the next calibration cycle of the first laser communication terminal is determined. The emitted power of the second beacon light is determined based on the received power of the first beacon light received by the second laser communication terminal. The second laser communication terminal uses the emitted power of the second beacon light to indicate the received power of the first beacon light, thereby enabling the first laser communication terminal to determine the adjustment method of the first beacon light in the next calibration cycle based on the received power of the second beacon light. The second laser communication terminal does not need to use signal light to indicate the first laser communication terminal, does not need to occupy the communication link, and does not need to interrupt communication. It can adjust the coaxiality of the first beacon light and the first signal light during normal communication between the first and second laser communication terminals, thereby improving the effective utilization rate of the communication link.

[0037] Furthermore, even if the first laser communication terminal and the second laser communication terminal fail to establish a communication link, the method described in the above embodiments can still be applied since there is no need to use a communication link to transmit information.

[0038] For example, in step S1, within the first time period, the coaxiality of the first beacon light and the first signal light emitted by the first laser communication terminal is adjusted according to the adjustment method of the first beacon light in the current calibration cycle. After step S3, in step S4, the next calibration cycle of the first laser communication terminal is entered, and the next calibration cycle is updated to the current calibration cycle. Steps S1 to S3 are repeated until a stopping condition is met. The stopping condition is, for example, when the received power of the first beacon light received by the second laser communication terminal reaches its peak value.

[0039] The following describes, with reference to some embodiments, how to adjust the coaxiality of the first beacon light and the first signal light emitted by the first laser communication terminal.

[0040] In some embodiments, the coaxiality of the first beacon light and the first signal light is adjusted by adjusting the rotation angle of the first optical deflector relative to the first axis and / or the second axis on the beacon light emission path, wherein the first axis and the second axis are reference axes of the first optical deflector, and the first axis and the second axis are perpendicular to each other.

[0041] For example, the first axis is a horizontal axis, and the second axis is a vertical axis. The directions of the first and second axes can be determined according to the actual coordinate system and are not limited to the examples given. In some embodiments, the first optical deflection device includes a fast-reflecting mirror or a MEMS (Micro-Electro-Mechanical Systems) micromirror, and is not limited to the examples given. The first optical deflection device can be used to precisely control the direction of the light beam, and the first optical deflection device does not affect the optical axis of the first signal light.

[0042] The method described in the above embodiments can adjust the coaxiality of the first beacon light and the first signal light simply by adjusting the rotation angle of the first optical deflection device relative to the first axis and / or the second axis, thereby improving the efficiency and convenience of coaxiality adjustment.

[0043] In some embodiments, the beacon light emitting optical path of the first laser communication terminal includes a beacon light source, a first optical deflector, a beam combiner, a second optical deflector, a third optical deflector, and an antenna. The first optical deflector includes a fast-reflecting mirror or a MEMS micromirror; the second optical deflector includes a fast-reflecting mirror or a MEMS micromirror; the third optical deflector includes a rotating mirror; and the beam combiner is used to combine the first beacon light and the first signal light. The signal light emitting optical path of the first laser communication terminal includes a signal light source, a beam combiner, a second optical deflector, a third optical deflector, and an antenna. The receiving optical path of the first laser communication terminal includes an antenna, a third optical deflector, a second optical deflector, a beam splitter, a camera, and a signal light receiver. The beam splitter is used to split the received signal light and beacon light, and the camera is used to receive the beacon light.

[0044] The first laser communication terminal includes a beacon light transmitting optical path, a signal light transmitting optical path, and a signal light and beacon light receiving optical path. For example... Figure 2 As shown, the beacon light emitted by the beacon light source 201 is deflected by the first optical deflector 202 and enters the beam combiner 203. The signal transceiver 207 can be used to transmit and receive signal light. The signal light can directly pass through the beam splitter 208 and enter the beam combiner 203. The beam combiner 203, for example, is a beam combiner mirror, which can be used to combine the signal light and the beacon light. After beam combining, the beam is redirected again by the second optical deflector 204. The second optical deflector 204 is used for the joint adjustment of the beacon light and signal light axes, which can be used for fine tracking. After being deflected by the second optical deflector 204, the beam passes through the third optical deflector 205 and is then emitted by the antenna 206. The first optical deflector 202 is only used to adjust the direction of the beacon light; therefore, the coaxiality of the signal light and the beacon light is adjusted by adjusting the first optical deflector 202.

[0045] like Figure 2 As shown, the light beam received by antenna 206 passes through the third optical deflector 205 and the second optical deflector 205, then directly through beam combiner 203, and enters beam splitter 208. Beam splitter 208 can split the signal light and beacon light into beams based on their different wavelengths. For example, beam splitter 208 can be a beam splitter. Camera 209 is used to detect beacon light, and signal transceiver 207 is used to receive signal light.

[0046] Figure 2 The optical path structure of the laser communication terminal shown can be used for any laser communication terminal, such as a first laser communication terminal and a second laser communication terminal. Figure 2 The optical path structure shown can also be modified, for example, by omitting the third optical deflector, or by adding some optical deflectors, etc., and is not limited to the examples given.

[0047] The optical path structure of the above embodiment can realize the transmission and reception of beacon light and signal light. Furthermore, by setting a first optical deflection device on the beacon light transmission optical path, the direction of the first beacon light optical axis can be adjusted conveniently and efficiently, thereby improving the convenient and efficient adjustment of the coaxiality of the first beacon light and the first signal light.

[0048] The following describes, with reference to some embodiments, how to determine the adjustment method of the first beacon light in the next calibration cycle of the first laser communication terminal.

[0049] In some embodiments, the adjustment method includes adjusting the direction of the first optical deflection device. Determining the adjustment method of the first beacon light in the next calibration cycle of the first laser communication terminal based on the received power of the second beacon light includes: determining the change in the received power of the second beacon light based on the received power of the second beacon light during the second time period and the received power before the second time period; and determining the adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal based on the change in the received power of the second beacon light, wherein the adjustment direction of the first optical deflection device represents the rotation direction of the first optical deflection device relative to the first axis or the second axis.

[0050] Adjusting the direction of the first optical deflector can adjust the direction of the beacon beam's optical axis. For example, by comparing the received power of the second beacon beam during the second time period with the received power before the second time period, it can be determined whether the received power of the second beacon beam has changed, and what type of change it is. Based on the change in the received power of the second beacon beam, it can be determined whether the adjustment direction of the first optical deflector in the next calibration cycle of the first laser communication terminal is the same as or different from the adjustment direction of the first optical deflector in the current calibration cycle.

[0051] The method in the above embodiment determines the adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal based on the change in the received power of the second beacon light, thereby enabling adjustment according to this direction in the next calibration cycle. This process does not require a communication link, achieving the determination of the adjustment direction in a simpler way and improving the effective utilization rate of the communication link.

[0052] The following describes, with reference to some embodiments, how to determine the adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal.

[0053] In some embodiments, the change in the received power of the second beacon light includes a first change, which indicates that the received power of the second laser communication terminal receiving the first beacon light has increased. Determining the adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal based on the change in the received power of the second beacon light includes: in response to the first change in the received power of the second beacon light, determining that the reference axis and adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal are the same as the reference axis and adjustment direction of the first optical deflection device in the current calibration cycle of the first laser communication terminal, wherein the reference axis includes a first axis or a second axis.

[0054] For example, the first change could be an increase in received power, or an increase in received power exceeding a first power threshold, etc., and is not limited to the examples given. If the received power of the second beacon light undergoes a first change, it can be determined that the adjustment method in the current calibration cycle is effective, and the same adjustment method can be used in the next calibration cycle, keeping the reference axis and adjustment method of the first optical deflection device unchanged.

[0055] The method described in the above embodiment can indicate an increase in the received power of the first beacon light received by the second laser communication terminal by a first change in the received power of the second beacon light, thereby enabling the first laser communication terminal to determine that the reference axis and adjustment method of the first optical deflection device remain unchanged in the next calibration cycle, thus improving the convenience and accuracy of determining the adjustment method in the next calibration cycle.

[0056] In some embodiments, the change in the received power of the second beacon light includes a second change or no change, which indicates that the received power of the second laser communication terminal receiving the first beacon light has not increased. Determining the adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal based on the change in the received power of the second beacon light includes: in response to the second change or no change in the received power of the second beacon light, determining whether the first number of consecutive second changes or no changes in the received power of the second beacon light reaches a first threshold; in response to the first number not reaching the first threshold, determining that the reference axis adjusted by the first optical deflection device in the next calibration cycle of the first laser communication terminal is the same as the reference axis adjusted by the first optical deflection device in the current calibration cycle of the first laser communication terminal, and that the adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal is opposite to the adjustment direction of the first optical deflection device in the current calibration cycle of the first laser communication terminal.

[0057] For example, the second change could be a decrease in received power, or a decrease in received power exceeding a second power threshold, etc., and is not limited to the examples given. If the received power of the second beacon light undergoes a second change or remains unchanged, it can be determined that the adjustment method in the current calibration cycle cannot improve the coaxiality of the first beacon light and the first signal light, and the adjustment method needs to be changed in the next calibration cycle.

[0058] For example, during the current calibration cycle, if the first optical deflector is rotated around the first axis in the first direction, and the received power of the second beacon light changes or remains unchanged, the first optical deflector can be rotated around the first axis in the second direction during the next calibration cycle, i.e., a reversal can be performed. If the received power of the second beacon light does not increase after multiple consecutive adjustments to the first optical deflector, it can be determined that the first optical deflector has been properly adjusted for the first axis; otherwise, further adjustments can be made.

[0059] Therefore, it can be determined whether the number of times the received power of the second beacon light continuously changes or remains unchanged reaches the first threshold. If the first number does not reach the first threshold, it can be determined that the reference axis adjusted by the first optical deflection device in the next calibration cycle is the same as the reference axis adjusted by the first optical deflection device in the current calibration cycle, and the adjustment direction of the first optical deflection device in the next calibration cycle is opposite to the adjustment direction of the first optical deflection device in the current calibration cycle.

[0060] The method in the above embodiment can indicate that the second laser communication terminal receives an increased power from the first beacon light by changing or keeping the power of the second beacon light received in the second change, thereby enabling the first laser communication terminal to determine that the reference axis and adjustment method of the first optical deflection device will be changed in the next calibration cycle, thus improving the convenience and accuracy of determining the adjustment method in the next calibration cycle.

[0061] In some embodiments, determining the adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal based on the change in the received power of the second beacon light further includes: in response to the first number reaching a first threshold, determining whether the first optical deflection device has been adjusted for both the first axis and the second axis; in response to the first optical deflection device being adjusted only for one of the first axis and the second axis, determining that the reference axis adjusted by the first optical deflection device in the next calibration cycle of the first laser communication terminal is different from the reference axis adjusted by the first optical deflection device in the current calibration cycle of the first laser communication terminal, and that the adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal is the initial direction.

[0062] If the first count reaches the first threshold, it can be further determined whether the first optical deflection device has been adjusted for both reference axes. If the first optical deflection device is adjusted for only one of the first and second axes, the reference axis is changed in the next calibration cycle, and adjustment begins from the initial direction corresponding to that reference axis.

[0063] The method described in the above embodiments can more accurately control the first optical deflection device to adjust the first axis and the second axis respectively, thereby improving the accuracy of coaxiality adjustment of the first beacon light and the first signal light.

[0064] In some embodiments, the calibration method further includes: in response to the first number reaching a first threshold and the first optical deflector being adjusted for both the first and second axes, determining the attitude of the first optical deflector when the received power of the second beacon light undergoes a first change as the final attitude of the first optical deflector, thereby completing the adjustment of the coaxiality of the first beacon light and the first signal light emitted by the first laser communication terminal.

[0065] If the first optical deflection device has completed adjustments for both the first and second axes, it can be determined that the received power of the second beacon light has undergone a first change, indicating that the received power of the first beacon light has reached its maximum. This determines the final orientation of the first optical deflection device, at which point the coaxiality of the first beacon light and the first signal light emitted by the first laser communication terminal is adjusted to meet the requirements.

[0066] The method described in the above embodiments can determine the stopping condition for the cyclic adjustment of the coaxiality of the first beacon light and the first signal light, thereby improving the accuracy of the coaxiality adjustment of the first beacon light and the first signal light.

[0067] In practical applications, the first optical deflector can be adjusted only for the first or second axis to achieve the required coaxiality between the first beacon light and the second signal light. In this case, it is unnecessary to perform the steps of determining whether the first optical deflector has been adjusted for both the first and second axes, or subsequent steps. Once the first optical deflector has been adjusted for either the first or second axis, the coaxiality adjustment is complete.

[0068] In the above embodiments, the stopping condition for cyclic adjustment is that the first number reaches a first threshold and the first optical deflection device has been adjusted for both the first and second axes. Other stopping conditions can also be set. For example, if the power received by the second laser communication terminal from the first beacon light reaches a third power threshold, the transmitted power of the second beacon light undergoes a third change. For example, the third change might increase the power significantly compared to the first change, creating a clear difference. When the first laser communication terminal receives the second beacon light and the received power undergoes this third change, the cyclic adjustment is stopped.

[0069] After determining the adjustment direction of the first optical deflector, its rotation angle relative to the first or second axis can be adjusted according to a preset step size within the next calibration cycle. To further improve the coaxiality adjustment accuracy, the adjustment step size can be dynamically adjusted.

[0070] In some embodiments, the adjustment method further includes the adjustment step size of the first optical deflection device. The method of determining the adjustment of the first beacon light in the next calibration cycle of the first laser communication terminal based on the received power of the second beacon light further includes: determining the adjustment step size of the first optical deflection device in the next calibration cycle of the first laser communication terminal based on the adjustment direction of the first optical deflection device in the current calibration cycle and the next calibration cycle of the first laser communication terminal, wherein the adjustment step size of the first optical deflection device represents the rotation angle value of the first optical deflection device relative to the first axis or the second axis.

[0071] For example, the adjustment step size is determined based on whether the adjustment direction of the first optical deflector changes within the current calibration cycle and the next calibration cycle. For instance, if the adjustment direction of the first optical deflector is different within the current calibration cycle and the next calibration cycle, the adjustment step size is reduced by a preset ratio; if the adjustment direction of the first optical deflector is the same within the current calibration cycle and the next calibration cycle, the adjustment step size remains unchanged.

[0072] The method described above can dynamically change the adjustment step size based on whether the adjustment direction of the first optical deflection device changes within the current calibration cycle and the next calibration cycle, thereby improving the accuracy of coaxiality adjustment of the first beacon light and the second signal light and reducing the probability of repeated ineffective adjustments.

[0073] In some embodiments, determining the adjustment step size of the first optical deflector in the next calibration cycle of the first laser communication terminal, based on the adjustment direction of the first optical deflector in the current calibration cycle and the next calibration cycle, includes: in response to an adjustment direction rollback event, determining the second consecutive occurrence of the adjustment direction rollback event, wherein the adjustment direction rollback event includes the first optical deflector being adjusted with the same reference axis and opposite adjustment directions in the current calibration cycle and the next calibration cycle of the first laser communication terminal; in response to the second occurrence reaching a second threshold, determining the product of the adjustment step size of the first optical deflector in the current calibration cycle of the first laser communication terminal and a preset value as the adjustment step size of the first optical deflector in the next calibration cycle of the first laser communication terminal, wherein the preset value is less than 1.

[0074] In some cases, environmental factors may cause a decrease in the power of the first beacon light received by the second laser communication terminal, thus triggering an adjustment direction backoff event. However, in reality, the coaxiality adjustment direction of the first beacon light and the second signal light is effective within the current cycle, and the adjustment step size does not need to be changed. Therefore, a second threshold is set for the adjustment direction backoff event to avoid the problem of inaccurate adjustment step size determination caused by the above situation.

[0075] If the number of consecutive backtracking events reaches the second threshold, the adjustment step size can be reduced. Then, when the first optical deflector is retracted in the next calibration cycle, it will not be directly adjusted to the attitude of the first optical deflector at the beginning of the current calibration cycle, reducing the number of repeated adjustments and improving the accuracy of coaxiality adjustment of the first beacon light and the second signal light.

[0076] In some embodiments, determining the adjustment step size of the first optical deflection device in the next calibration cycle of the first laser communication terminal, based on the adjustment direction of the first optical deflection device in the current calibration cycle and the next calibration cycle of the first laser communication terminal, further includes: in response to the second number not reaching the second threshold, determining the adjustment step size of the first optical deflection device in the current calibration cycle of the first laser communication terminal as the adjustment step size of the first optical deflection device in the next calibration cycle of the first laser communication terminal.

[0077] If the second count does not reach the second threshold, the adjustment step size of the current calibration cycle can be maintained in the next calibration cycle. This reduces the interference of adjustment direction rollback events caused by environmental factors on the effectiveness of determining the coaxiality adjustment of the first beacon light and the second signal light in the current calibration cycle, thereby improving the accuracy of the coaxiality calibration of the first beacon light and the second signal light.

[0078] For example, a minimum adjustment step size can be set. When the adjustment step size in the current calibration cycle reaches the minimum adjustment step size, the adjustment step size will no longer be changed. This will not be elaborated further here.

[0079] Figure 3 Flowcharts showing other embodiments of the calibration method for the laser communication terminal disclosed herein. For example... Figure 3 As shown, step S3 includes S301 to S312.

[0080] In step S301, the change in the received power of the second beacon light is determined based on the received power of the second beacon light during the second time period and the received power before the second time period. If the received power of the second beacon light undergoes a first change, steps S302-S303 are executed; if the received power of the second beacon light undergoes a second change or remains unchanged, steps S304-S312 are executed.

[0081] In step S302, it is determined that the reference axis and adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal are the same as those of the first optical deflection device in the current calibration cycle of the first laser communication terminal.

[0082] In step S303, it is determined that the adjustment step size of the first optical deflection device in the next calibration cycle of the first laser communication terminal is the same as the adjustment step size of the first optical deflection device in the current calibration cycle of the first laser communication terminal.

[0083] In step S304, it is determined whether the first number of times the received power of the second beacon light has undergone a second change or remained unchanged has reached a first threshold. If so, steps S305 to S307 are executed; otherwise, step S308 is executed.

[0084] In step S305, it is determined whether the first optical deflection device has been adjusted for both the first and second axes. If so, step S306 is executed; otherwise, step S307 is executed.

[0085] In step S306, the attitude of the first optical deflection device when the received power of the second beacon light undergoes a first change is determined as the final attitude of the first optical deflection device, thereby completing the adjustment of the coaxiality of the first beacon light and the first signal light emitted by the first laser communication terminal.

[0086] In step S307, it is determined that the reference axis adjusted by the first optical deflection device in the next calibration cycle of the first laser communication terminal is different from the reference axis adjusted by the first optical deflection device in the current calibration cycle of the first laser communication terminal, and the adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal is the initial direction.

[0087] In step S308, it is determined that the reference axis of the first optical deflection device adjusted in the next calibration cycle of the first laser communication terminal is the same as the reference axis of the first optical deflection device adjusted in the current calibration cycle of the first laser communication terminal, and the adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal is opposite to the adjustment direction of the first optical deflection device in the current calibration cycle of the first laser communication terminal.

[0088] In step S309, the second consecutive occurrence of the adjustment direction rollback event is determined. The adjustment direction rollback event includes the first optical deflection device being adjusted with the same reference axis and opposite adjustment directions in the current calibration cycle and the next calibration cycle of the first laser communication terminal.

[0089] In step S310, it is determined whether the second count reaches the second threshold. If it does, step S311 is executed; otherwise, step S312 is executed.

[0090] In step S311, the product of the adjustment step size of the first optical deflection device in the current calibration cycle of the first laser communication terminal and the preset value is determined as the adjustment step size of the first optical deflection device in the next calibration cycle of the first laser communication terminal.

[0091] In step S312, the adjustment step size of the first optical deflection device in the current calibration cycle of the first laser communication terminal is determined as the adjustment step size of the first optical deflection device in the next calibration cycle of the first laser communication terminal.

[0092] In the above embodiments, the adjustment of the first optical deflection device is divided into two stages: adjustment of the first axis and adjustment of the second axis. The adjustment can be performed on the first axis first, followed by adjustment of the second axis. Alternatively, each calibration cycle can be divided into two stages: in the first stage, the first optical deflection device is adjusted for the first axis, and in the second stage, the first optical deflection device is adjusted for the second axis.

[0093] For example, within the current calibration cycle of the first laser communication terminal: In the first time period, the coaxiality of the first beacon light and the first signal light emitted by the first laser communication terminal is adjusted by adjusting the rotation angle of the first optical deflector relative to the first axis (adjusted according to the adjustment direction and adjustment step size); in the second time period, the second beacon light emitted by the second laser communication terminal is received; based on the received power of the second beacon light, the adjustment direction and adjustment step size of the first optical deflector relative to the first axis in the next calibration cycle of the first laser communication terminal are determined. In the fifth time period, the coaxiality of the first beacon light and the first signal light emitted by the first laser communication terminal is adjusted by adjusting the rotation angle of the first optical deflector relative to the second axis; in the sixth time period, the second beacon light emitted by the second laser communication terminal is received; based on the received power of the second beacon light, the adjustment direction and adjustment step size of the first optical deflector relative to the second axis in the next calibration cycle of the first laser communication terminal are determined.

[0094] A calibration cycle may include four time periods. The first two time periods are used to determine the adjustment direction and adjustment step size of the first optical deflector relative to the first axis in the next calibration cycle. The last two time periods are used to determine the adjustment direction and adjustment step size of the first optical deflector relative to the second axis in the next calibration cycle. The determination of the adjustment direction and adjustment step size can refer to the aforementioned embodiments. It is not necessary to determine whether the first optical deflector has been adjusted for both the first and second axes. The first and second counts are determined for the first and second axes, respectively, and will not be elaborated further here.

[0095] The coaxiality of the first beacon light and the first signal light of the first laser communication terminal and the coaxiality of the second beacon light and the second signal light of the second laser communication terminal can both be calibrated. Some embodiments are described below.

[0096] In some embodiments, during the current calibration period of the second laser communication terminal: during a third time period, the second beacon light emitted by the second laser communication terminal is received; the emission power of the first beacon light is determined based on the received power of the second beacon light; and during a fourth time period, the first beacon light is emitted to the second laser communication terminal based on the emission power.

[0097] The first and second laser communication terminals can be calibrated alternately, or the first laser communication terminal can be calibrated first, followed by the second. When calibrating the second laser communication terminal, the first and second laser communication terminals switch roles. During a third time period, the first laser communication terminal receives the second beacon light emitted by the second laser communication terminal and determines the transmission power of the first beacon light based on the received power of the second beacon light. During a fourth time period, the first beacon light is emitted back to the second laser communication terminal based on the transmission power, to indicate changes in the received power of the second beacon light.

[0098] Based on the above method, the first laser communication terminal can adjust the transmission power of the first beacon light according to the received power of the second beacon light, and indicate the change in the received power of the second beacon light. This helps the first laser communication terminal to adjust the coaxiality of both the second beacon light and the second signal light without occupying the communication link of the second laser communication terminal, thus improving the effective utilization rate of the communication link.

[0099] In some embodiments, determining the transmit power of the first beacon light based on the receive power of the second beacon light includes: determining whether the receive power of the second beacon light has increased based on the receive power of the second beacon light during and before the third time period; determining that the transmit power of the first beacon light has undergone a first change in response to the increase in the receive power of the second beacon light; and determining the transmit power of the first beacon light based on the first change.

[0100] In some embodiments, determining the transmit power of the first beacon light based on the receive power of the second beacon light further includes: determining whether the transmit power of the first beacon light undergoes a second change or remains unchanged in response to a decrease or no change in the receive power of the second beacon light; and determining the transmit power of the first beacon light based on the second change or no change.

[0101] The first laser communication terminal determines the different changes in the transmission power of the first beacon light based on the different changes in the received power of the second beacon light, so that the second laser communication terminal can accurately obtain the indication information and improve the accuracy of the coaxiality adjustment of the second beacon light and the second signal light of the second laser communication terminal. For details, please refer to the aforementioned embodiments, which will not be repeated here.

[0102] In some embodiments, the first beacon light is a pulsed beacon light, and the first change includes increasing a preset power value. Determining the transmission power of the first beacon light according to the first change includes: determining the number of single-pulse neutron pulses of the first beacon light according to the preset power value, wherein the transmission power of the first beacon light is adjusted by adjusting the number of single-pulse neutron pulses.

[0103] For example, the basic transmission parameters of a pulsed beacon light are that a single pulse contains 5 sub-pulses, and the pulse width of a single sub-pulse is 100ns. When the received optical power of the beacon light is increased (the first change), the number of sub-pulses in the single pulse is changed to 6.

[0104] The method described in the above embodiments adjusts the emission power of the first beacon light by adjusting the number of single-pulse neutron pulses, thereby improving the accuracy of adjusting the emission power of the first beacon light.

[0105] In some embodiments, the calibration method further includes: adjusting the emission power of the first beacon light to the emission power prior to the fourth time period during the fifth time period.

[0106] At the end of each calibration cycle, the first laser communication terminal adjusts its transmission power back to the base transmission power so that the next calibration cycle can indicate the power change of the second beacon light by adjusting the transmission power of the first beacon light, thereby improving accuracy.

[0107] The methods executed by the first laser communication terminal in the above embodiments are also applicable to the second laser communication terminal, and will not be described again here.

[0108] The calibration cycle and duration of each time period for the first and second laser communication terminals can be statically configured, or they can be negotiated and determined by the first and second laser communication terminals before calibration. For example, the first laser communication terminal sends a calibration request to the second laser communication terminal, which includes the start time of the calibration cycle, the duration of the calibration cycle, the duration of the first time period, and the duration of the second time period. The second laser communication terminal replies with confirmation information. The confirmation information may include the start time of the calibration cycle, the duration of the calibration cycle, and the duration of the third and fourth time periods. The second laser communication terminal can also send calibration requests to the first laser communication terminal, which will not be elaborated further.

[0109] Figure 4 Flowcharts are shown for further embodiments of the calibration method for the laser communication terminal disclosed herein. For example... Figure 4 As shown, the method of this embodiment includes steps S41, S44, S46, and S47 executed by a first laser communication terminal and steps S42, S43, S45, and S48 executed by a second laser communication terminal. The method of this embodiment may include the method within one calibration cycle of the first laser communication terminal and the method within one calibration cycle of the second laser communication terminal.

[0110] In step S41, during the first time period, the first laser communication terminal adjusts the coaxiality of the emitted first beacon light and the first signal light.

[0111] In step S42, during the first time period, the second laser communication terminal monitors the received power of the first beacon light.

[0112] In step S43, during the second time period, the second laser communication terminal determines the transmission power of the second beacon light based on the change in the received power of the first beacon light during the first time period and transmits the second beacon light according to the transmission power.

[0113] In step S44, during the second time period, the first laser communication terminal receives the second beacon light emitted by the second laser communication terminal, and determines the adjustment mode of the first beacon light in the next calibration cycle of the first laser communication terminal based on the received power of the second beacon light.

[0114] In step S45, during the third time period, the second laser communication terminal adjusts the coaxiality of the emitted second beacon light and the second signal light.

[0115] In step S46, during the third time period, the first laser communication terminal monitors the received power of the second beacon light.

[0116] In step S47, during the fourth time period, the first laser communication terminal determines the transmission power of the first beacon light based on the change in the received power of the second beacon light during the third time period and transmits the first beacon light according to the transmission power.

[0117] In step S48, during the fourth time period, the second laser communication terminal receives the first beacon light emitted by the first laser communication terminal, and determines the adjustment mode of the second beacon light in the next calibration cycle of the second laser communication terminal based on the received power of the first beacon light.

[0118] In the above embodiments, the first laser communication terminal and the second laser communication terminal are calibrated alternately, which can more effectively improve the communication quality between the two. The calibration process of the first laser communication terminal and the second laser communication terminal can be combined with the foregoing embodiments, and will not be repeated here.

[0119] This disclosure also provides a calibration device for a laser communication terminal, which is described below in conjunction with... Figure 5 Describe it.

[0120] Figure 5 These are structural diagrams of some embodiments of the calibration apparatus for the laser communication terminal disclosed herein. Figure 5 As shown, the device 50 of this embodiment includes: an adjustment module 510, a receiving module 520, and a determining module 530. The device 50 can be applied to a first laser communication terminal.

[0121] Within the current calibration cycle of the first laser communication terminal: the adjustment module 510 is used to adjust the coaxiality of the first beacon light and the first signal light emitted by the first laser communication terminal within a first time period, wherein the received power of the first signal light received by the second laser communication terminal reaches its peak value; the receiving module 520 is used to receive the second beacon light emitted by the second laser communication terminal within a second time period, wherein the emission power of the second beacon light is determined based on the received power of the first beacon light received by the second laser communication terminal; the determining module 530 is used to determine the adjustment method of the first beacon light in the next calibration cycle of the first laser communication terminal based on the received power of the second beacon light.

[0122] In some embodiments, the adjustment module 510 is used to adjust the coaxiality of the first beacon light and the first signal light by adjusting the rotation angle of the first optical deflector relative to the first axis and / or the second axis on the beacon light emission optical path, wherein the first axis and the second axis are the reference axes of the first optical deflector, and the first axis and the second axis are perpendicular to each other.

[0123] In some embodiments, the adjustment method includes the adjustment direction of the first optical deflection device. The determining module 530 is used to determine the change in the received power of the second beacon light based on the received power of the second beacon light during the second time period and the received power before the second time period; and to determine the adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal based on the change in the received power of the second beacon light, wherein the adjustment direction of the first optical deflection device represents the rotation direction of the first optical deflection device relative to the first axis or the second axis.

[0124] In some embodiments, the change in the received power of the second beacon light includes a first change, which indicates that the received power of the second laser communication terminal receiving the first beacon light has increased. The determining module 530 is used to determine, in response to the first change in the received power of the second beacon light, that the reference axis and adjustment direction of the first optical deflection device adjusted in the next calibration cycle of the first laser communication terminal are the same as those of the first optical deflection device adjusted in the current calibration cycle of the first laser communication terminal, wherein the reference axis includes a first axis or a second axis.

[0125] In some embodiments, the change in the received power of the second beacon light includes a second change or no change, which indicates that the received power of the second laser communication terminal receiving the first beacon light has not increased. The determining module 530 is used to determine whether the first number of consecutive second changes or no changes in the received power of the second beacon light reaches a first threshold in response to the second change or no change in the received power of the second beacon light. In response to the first number not reaching the first threshold, it is determined that the reference axis adjusted by the first optical deflection device in the next calibration cycle of the first laser communication terminal is the same as the reference axis adjusted by the first optical deflection device in the current calibration cycle of the first laser communication terminal, and the adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal is opposite to the adjustment direction of the first optical deflection device in the current calibration cycle of the first laser communication terminal.

[0126] In some embodiments, the determining module 530 is further configured to, in response to the first number reaching the first threshold, determine whether the first optical deflection device has been adjusted for both the first axis and the second axis; and in response to the first optical deflection device being adjusted for only one of the first axis and the second axis, determine that the reference axis adjusted by the first optical deflection device in the next calibration cycle of the first laser communication terminal is different from the reference axis adjusted by the first optical deflection device in the current calibration cycle of the first laser communication terminal, and that the adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal is the initial direction.

[0127] In some embodiments, the determining module 530 is further configured to, in response to the first number reaching the first threshold and the first optical deflection device having been adjusted for both the first and second axes, determine the attitude of the first optical deflection device when the received power of the second beacon light undergoes a first change as the final attitude of the first optical deflection device, thereby completing the adjustment of the coaxiality of the first beacon light and the first signal light emitted by the first laser communication terminal.

[0128] In some embodiments, the adjustment method further includes the adjustment step size of the first optical deflection device. The determining module 530 is further configured to determine the adjustment step size of the first optical deflection device in the next calibration cycle of the first laser communication terminal based on the adjustment direction of the first optical deflection device in the current calibration cycle and the next calibration cycle of the first laser communication terminal. The adjustment step size of the first optical deflection device represents the rotation angle value of the first optical deflection device relative to the first axis or the second axis.

[0129] In some embodiments, the determining module 530 is configured to determine the second consecutive occurrence of the adjustment direction rollback event in response to the occurrence of the adjustment direction rollback event, wherein the adjustment direction rollback event includes the first optical deflection device having the same reference axis and opposite adjustment directions in the current calibration cycle and the next calibration cycle of the first laser communication terminal; in response to the second occurrence reaching a second threshold, the product of the adjustment step size of the first optical deflection device in the current calibration cycle of the first laser communication terminal and a preset value is determined as the adjustment step size of the first optical deflection device in the next calibration cycle of the first laser communication terminal, wherein the preset value is less than 1.

[0130] In some embodiments, the determining module 530 is further configured to, in response to the second number not reaching the second threshold, determine the adjustment step size of the first optical deflection device in the current calibration cycle of the first laser communication terminal as the adjustment step size of the first optical deflection device in the next calibration cycle of the first laser communication terminal.

[0131] In some embodiments, the device 50 further includes a transmitting module 540, and a receiving module 520 is further configured to: receive a second beacon light emitted by the second laser communication terminal during a third time period during the current calibration cycle of the second laser communication terminal; and the transmitting module 540 is configured to determine the transmitting power of the first beacon light based on the received power of the second beacon light; and transmit the first beacon light to the second laser communication terminal based on the transmitting power during a fourth time period.

[0132] In some embodiments, the transmitting module 540 is configured to determine whether the received power of the second beacon light has increased based on the received power of the second beacon light during and before the third time period; in response to the increase in the received power of the second beacon light, determine that the transmitting power of the first beacon light has undergone a first change; and determine the transmitting power of the first beacon light based on the first change.

[0133] In some embodiments, the first beacon light is a pulsed beacon light, and the first change includes increasing a preset power value. The transmitting module 540 is used to determine the number of single-pulse neutron pulses of the first beacon light according to the preset power value, wherein the transmitting power of the first beacon light is adjusted by adjusting the number of single-pulse neutron pulses.

[0134] In some embodiments, the transmitting module 540 is further configured to determine whether the transmitting power of the first beacon light undergoes a second change or remains unchanged in response to a decrease or no change in the received power of the second beacon light; and to determine the transmitting power of the first beacon light based on the second change or no change.

[0135] In some embodiments, the transmitting module 540 is further configured to adjust the transmitting power of the first beacon light to the transmitting power prior to the fourth time period during the fifth time period.

[0136] In some embodiments, the beacon light emitting optical path of the first laser communication terminal includes a beacon light source, a first optical deflector, a beam combiner, a second optical deflector, a third optical deflector, and an antenna. The first optical deflector includes a fast-reflecting mirror or a MEMS micromirror; the second optical deflector includes a fast-reflecting mirror or a MEMS micromirror; the third optical deflector includes a rotating mirror; and the beam combiner is used to combine the first beacon light and the first signal light. The signal light emitting optical path of the first laser communication terminal includes a signal light source, a beam combiner, a second optical deflector, a third optical deflector, and an antenna. The receiving optical path of the first laser communication terminal includes an antenna, a third optical deflector, a second optical deflector, a beam splitter, a camera, and a signal light receiver. The beam splitter is used to split the received signal light and beacon light, and the camera is used to receive the beacon light.

[0137] This disclosure also provides a calibration device for a laser communication terminal, which is described below in conjunction with... Figure 6 as well as Figure 7 Describe it.

[0138] Figure 6 These are structural diagrams of some embodiments of the calibration apparatus for the laser communication terminal disclosed herein. Figure 6 As shown, the laser communication terminal calibration device 60 of this embodiment includes: a memory 610 and a processor 620 coupled to the memory 610. The processor 620 is configured to execute the laser communication terminal calibration method of any of the embodiments of this disclosure based on instructions stored in the memory 610.

[0139] The memory 610 may include, for example, system memory, fixed non-volatile storage media, etc. The system memory may store, for example, an operating system, application programs, a boot loader, a database, and other programs.

[0140] Figure 7 These are structural diagrams of other embodiments of the calibration apparatus for the laser communication terminal disclosed herein. For example... Figure 7 As shown, the calibration device 70 of the laser communication terminal in this embodiment includes a memory 710 and a processor 720, which are similar to the memory 610 and processor 620, respectively. It may also include an input / output interface 730, a network interface 740, a storage interface 750, etc. These interfaces 730, 740, 750, and the memory 710 and processor 720 can be connected, for example, via a bus 760. The input / output interface 730 provides a connection interface for input / output devices such as a display, mouse, keyboard, and touchscreen. The network interface 740 provides a connection interface for various networked devices, such as connecting to a database server or cloud storage server. The storage interface 750 provides a connection interface for external storage devices such as SD cards and USB flash drives.

[0141] This disclosure also provides a computer-readable storage medium having a computer program stored thereon, wherein the program, when executed by a processor, implements a calibration method for a laser communication terminal as described in any embodiment of this disclosure.

[0142] This disclosure also provides a laser communication terminal, which is described below in conjunction with... Figure 8 Describe it.

[0143] Figure 8 These are structural diagrams of some embodiments of the laser communication terminal disclosed herein. For example... Figure 8 As shown, the laser communication terminal 80 of this embodiment includes: a calibration device 50 / 60 / 70 for laser communication terminals according to any embodiment of this disclosure, a beacon light emitting optical path 81, a signal light emitting optical path 82, and a receiving optical path 83. The beacon light emitting optical path 81, the signal light emitting optical path 82, and the receiving optical path 83 can be referenced... Figure 2 As shown, it will not be elaborated further here.

[0144] Laser communication terminals can be satellite terminals, etc.

[0145] This disclosure also provides a calibration system for a laser communication terminal, which is described below in conjunction with... Figure 9 Describe it.

[0146] Figure 9 These are structural diagrams of some embodiments of the calibration system for the laser communication terminal disclosed herein. Figure 9 As shown, the system 9 of this embodiment includes: a plurality of laser communication terminals 80, wherein any two laser communication terminals 80 serve as a first laser communication terminal and a second laser communication terminal.

[0147] This disclosure also provides a computer program product including instructions that, when executed by a processor, cause the processor to perform a calibration method for a laser communication terminal as described in any embodiment of this disclosure.

[0148] This disclosure also provides a computer program including instructions that, when executed by a processor, cause the processor to perform a calibration method for a laser communication terminal as described in any embodiment of this disclosure.

[0149] Those skilled in the art will understand that embodiments of this disclosure can be provided as methods, systems, or computer program products. Therefore, this disclosure can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this disclosure can take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0150] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0151] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0152] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0153] The above are merely preferred embodiments of this disclosure and are not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A calibration method for a laser communication terminal, applied to a first laser communication terminal, comprising, within the current calibration cycle of the first laser communication terminal: During the first time period, the coaxiality of the first beacon light and the first signal light emitted by the first laser communication terminal is adjusted by adjusting the rotation angle of the first optical deflector relative to the first axis and / or the second axis on the beacon light emission path. The first axis and the second axis are the reference axes of the first optical deflection device. The first axis and the second axis are perpendicular to each other. When the received power of the first signal light from the first laser communication terminal reaches the peak value, it indicates that the first signal light is aligned with the second laser communication terminal. During the second time period, the second beacon light emitted by the second laser communication terminal is received, wherein the emission power of the second beacon light is determined based on the reception power of the first beacon light received by the second laser communication terminal; Based on the received power of the second beacon light, the adjustment method of the first beacon light in the next calibration cycle of the first laser communication terminal is determined.

2. The calibration method according to claim 1, wherein, The adjustment method includes adjusting the direction of the first optical deflection device. Based on the received power of the second beacon light, determining the adjustment method of the first beacon light in the next calibration cycle of the first laser communication terminal includes: Based on the received power of the second beacon light during the second time period and the received power before the second time period, determine the change in the received power of the second beacon light; Based on the change in the received power of the second beacon light, the adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal is determined, wherein the adjustment direction of the first optical deflection device represents the rotation direction of the first optical deflection device relative to the first axis or the second axis.

3. The calibration method according to claim 2, wherein, The change in the received power of the second beacon light includes a first change, which indicates that the received power of the second laser communication terminal receiving the first beacon light has increased. Based on the change in the received power of the second beacon light, determining the adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal includes: In response to the first change in the received power of the second beacon light, it is determined that the reference axis and adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal are the same as the reference axis and adjustment direction of the first optical deflection device in the current calibration cycle of the first laser communication terminal, wherein the reference axis includes the first axis or the second axis.

4. The calibration method according to claim 3, wherein, The change in the received power of the second beacon light includes a second change or no change. The second change or no change is used to indicate that the received power of the first beacon light received by the second laser communication terminal has not increased. Based on the change in the received power of the second beacon light, determining the adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal includes: In response to the second change or the unchanged received power of the second beacon light, determine whether the first number of consecutive changes or unchanged received power of the second beacon light reaches a first threshold. In response to the first number of times not reaching the first threshold, it is determined that the reference axis adjusted by the first optical deflection device in the next calibration cycle of the first laser communication terminal is the same as the reference axis adjusted by the first optical deflection device in the current calibration cycle of the first laser communication terminal, and the adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal is opposite to the adjustment direction of the first optical deflection device in the current calibration cycle of the first laser communication terminal.

5. The calibration method according to claim 4, wherein, Determining the adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal, based on the change in the received power of the second beacon light, further includes: In response to the first number of times reaching the first threshold, it is determined whether the first optical deflection device has been adjusted for both the first axis and the second axis; In response to the fact that the first optical deflection device adjusts only for one of the first axis and the second axis, it is determined that the reference axis adjusted by the first optical deflection device in the next calibration cycle of the first laser communication terminal is different from the reference axis adjusted by the first optical deflection device in the current calibration cycle of the first laser communication terminal, and the adjustment direction of the first optical deflection device in the next calibration cycle of the first laser communication terminal is the initial direction.

6. The calibration method according to claim 5, further comprising: In response to the first number of times reaching the first threshold and the first optical deflection device having been adjusted for both the first axis and the second axis, the attitude of the first optical deflection device when the received power of the second beacon light undergoes the first change is determined as the final attitude of the first optical deflection device, thereby completing the adjustment of the coaxiality of the first beacon light and the first signal light emitted by the first laser communication terminal.

7. The calibration method according to claim 2, wherein, The adjustment method also includes the adjustment step size of the first optical deflection device. Based on the received power of the second beacon light, the adjustment method for the first beacon light in the next calibration cycle of the first laser communication terminal further includes: Based on the adjustment direction of the first optical deflection device in the current calibration cycle and the next calibration cycle of the first laser communication terminal, the adjustment step size of the first optical deflection device in the next calibration cycle of the first laser communication terminal is determined, wherein the adjustment step size of the first optical deflection device represents the rotation angle value of the first optical deflection device relative to the first axis or the second axis.

8. The calibration method according to claim 7, wherein, Based on the adjustment direction of the first optical deflection device in the current calibration cycle and the next calibration cycle of the first laser communication terminal, the adjustment step size of the first optical deflection device in the next calibration cycle of the first laser communication terminal is determined as follows: In response to the occurrence of an adjustment direction rollback event, the second consecutive occurrence of the adjustment direction rollback event is determined, wherein the adjustment direction rollback event includes the first optical deflection device being adjusted with the same reference axis and opposite adjustment directions in the current calibration cycle and the next calibration cycle of the first laser communication terminal; In response to the second number of times reaching the second threshold, the product of the adjustment step size of the first optical deflection device in the current calibration cycle of the first laser communication terminal and the preset value is determined as the adjustment step size of the first optical deflection device in the next calibration cycle of the first laser communication terminal, wherein the preset value is less than 1.

9. The calibration method according to claim 8, wherein, Determining the adjustment step size of the first optical deflection device in the next calibration cycle of the first laser communication terminal, based on the adjustment direction of the first optical deflection device in the current calibration cycle and the next calibration cycle, further includes: In response to the second number of times failing to reach the second threshold, the adjustment step size of the first optical deflection device in the current calibration cycle of the first laser communication terminal is determined as the adjustment step size of the first optical deflection device in the next calibration cycle of the first laser communication terminal.

10. The calibration method according to any one of claims 1-9, further comprising, within the current calibration cycle of the second laser communication terminal: During the third time period, the second beacon light emitted by the second laser communication terminal is received; The transmission power of the first beacon light is determined based on the received power of the second beacon light; During the fourth time period, the first beacon light is transmitted to the second laser communication terminal according to the transmission power.

11. The calibration method according to claim 10, wherein, Determining the transmit power of the first beacon light based on the received power of the second beacon light includes: Based on the received power of the second beacon light during and before the third time period, determine whether the received power of the second beacon light has increased; In response to an increase in the received power of the second beacon light, it is determined that the transmitted power of the first beacon light has undergone a first change; Based on the first change, determine the emission power of the first beacon light.

12. The calibration method according to claim 11, wherein, The first beacon light is a pulsed beacon light, and the first change includes increasing a preset power value. Determining the transmission power of the first beacon light based on the first change includes: Based on the preset power value, the number of single-pulse neutron pulses of the first beacon light is determined, wherein the emission power of the first beacon light is adjusted by adjusting the number of single-pulse neutron pulses.

13. The calibration method according to claim 11, wherein, Determining the transmission power of the first beacon light based on the received power of the second beacon light further includes: In response to a decrease or no change in the received power of the second beacon light, it is determined that the transmitted power of the first beacon light has undergone a second change or remains unchanged; The emission power of the first beacon light is determined based on whether the second change occurs or remains unchanged.

14. The calibration method according to claim 10, further comprising: During the fifth time period, the emission power of the first beacon light is adjusted to the emission power prior to the fourth time period.

15. The calibration method according to any one of claims 1-9, wherein, The beacon light emission path of the first laser communication terminal includes a beacon light source, a first optical deflector, a beam combiner, a second optical deflector, a third optical deflector, and an antenna. The first optical deflector includes a fast-reflecting mirror or a MEMS micromirror, the second optical deflector includes a fast-reflecting mirror or a MEMS micromirror, the third optical deflector includes a rotating mirror, and the beam combiner is used to combine the first beacon light and the first signal light. The signal light emitting optical path of the first laser communication terminal includes a signal light source, the beam combining device, the second optical deflecting device, the third optical deflecting device, and the antenna; The receiving optical path of the first laser communication terminal includes the antenna, the third optical deflector, the second optical deflector, the beam splitter, the camera, and the signal light receiver. The beam splitter is used to split the received signal light and beacon light, and the camera is used to receive the beacon light.

16. A calibration device for a laser communication terminal, comprising: processor; as well as A memory coupled to the processor is used to store instructions that, when executed by the processor, cause the processor to perform the calibration method for the laser communication terminal as described in any one of claims 1 to 15.

17. A computer-readable storage medium having a computer program stored thereon, wherein, When executed by the processor, the program implements the calibration method for the laser communication terminal as described in any one of claims 1 to 15.

18. A laser communication terminal, comprising: The calibration device, beacon light emitting optical path, signal light emitting optical path, and receiving optical path of the laser communication terminal as described in claim 16.

19. A calibration system for a laser communication terminal, comprising a plurality of laser communication terminals as described in claim 18, wherein any two of the plurality of laser communication terminals serve as the first laser communication terminal and the second laser communication terminal.

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