A coherent beam combining system, method, terminal and storage medium for multi-aperture reception
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- PENG CHENG LAB
- Filing Date
- 2026-02-10
- Publication Date
- 2026-06-09
Smart Images
Figure CN122179009A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of laser coherent beam combining technology, and in particular to a coherent beam combining system, method, terminal, and storage medium for multi-aperture receivers. Background Technology
[0002] In existing technologies, free-space laser communication (such as inter-satellite, satellite-to-ground, and terrestrial laser communication) is an important technology for achieving high-speed, high-capacity transmission. However, its links face multiple challenges, including signal attenuation, phase distortion and beam drift caused by atmospheric turbulence, and background light interference. To address these issues, multi-aperture receiving technology has become an effective solution. By working collaboratively with distributed sub-apertures, it can synthesize a larger receiving area to enhance light collection capabilities and utilize spatial diversity effects to resist signal fading caused by turbulence, thereby improving link reliability.
[0003] Under this architecture, the core issue becomes how to efficiently synthesize the signals received by each sub-aperture. Existing technologies are mainly divided into two categories: one is electrical domain synthesis (incoherent synthesis), which involves independently performing photoelectric conversion after each sub-aperture and then synthesizing the multiple electrical signals; the other is optical domain coherent synthesis, a typical method of which uses a stochastic parallel gradient descent algorithm to control the optical phase shifter in the optical fiber, and iteratively searches for the optimal phase by monitoring the synthesized optical power to achieve coherent synthesis.
[0004] However, both approaches have significant drawbacks. Electrical domain combining completely discards phase information, resulting in only incoherent energy superposition, which offers limited signal-to-noise ratio improvement and fails to achieve the signal amplitude superposition gain provided by coherent combining. The stochastic parallel gradient descent algorithm used in optical domain coherent combining has a slow convergence speed, making it difficult to track rapid phase changes in dynamic channels in real time. Furthermore, it is prone to getting trapped in local optima, leading to unstable combining efficiency and an inability to maintain a globally optimal coherent combining state.
[0005] Therefore, how to efficiently synthesize the signals received from each sub-aperture has become an urgent problem to be solved.
[0006] Therefore, existing technologies still need to be improved and enhanced. Summary of the Invention
[0007] The main objective of this invention is to provide a coherent beam combining system, method, terminal, and storage medium for multi-aperture reception, aiming to solve the problem in the prior art that it is impossible to achieve fast and accurate coherent combining of multiple target optical signals under dynamic disturbance environments.
[0008] To achieve the aforementioned objective, a first aspect of the present invention provides a coherent beam combining system for multi-aperture reception, the coherent beam combining system for multi-aperture reception comprising: The system comprises a distributed receiving module, a phase modulation module, a power and interferometric measurement module, and a conversion and control module, which are sequentially optically connected. The power and interferometric measurement module includes a beam splitting component, an interferometric beam combining component, and a power detection component. The distributed receiving module is used to receive multiple target optical signals and output them to the phase modulation module. The multiple target optical signals include one reference optical signal and multiple non-reference optical signals. The phase modulation module is used to introduce independently modulated phase shifts into the multiple target optical signals respectively; The beam splitting assembly includes a first reference path beam splitter, a second reference path beam splitter, and multiple non-reference path beam splitters. The first reference path beam splitter is used to split the reference path optical signal into a first reference path optical signal and a second reference path optical signal according to a first target ratio. The second reference path beam splitter is used to split the second reference path optical signal into multiple third reference path optical signals, the number of which is the same as the number of multiple target optical signals. The non-reference path beam splitter is used to split one of the non-reference path optical signals into a first target optical signal, a second target optical signal, and a third target optical signal according to a second target ratio. The number of non-reference path beam splitters is the same as the number of non-reference path optical signals, and the non-reference path optical signals split by each non-reference path beam splitter are different. The interference combining assembly includes multiple fiber couplers, each fiber coupler being connected to a third reference path optical signal and a third target optical signal. The third reference path optical signal and the third target optical signal connected to each fiber coupler are different. Each fiber coupler is used to interfere and combine the third reference path optical signal and the third target optical signal connected to it to obtain multiple target interference optical signals. The number of target interference optical signals is the same as the number of non-reference path optical signals. The power detection component is used to monitor the power of the reference path optical signal, the non-reference path optical signal, the interference optical signal output by the interference beam combiner component, and the total combined optical signal, respectively. The conversion and control module is used to calculate the phase difference between each optical signal based on the power information obtained by the power detection component, and to generate a control signal to control the phase modulation module in order to achieve phase compensation for each optical signal.
[0009] Secondly, the present invention also provides a coherent beam combining method for multi-aperture reception, wherein the coherent beam combining method for multi-aperture reception includes: The phase modulator of the reference path is set to the initial state. The first optical power, the second optical power, and the first interference power are obtained. The target initial phase difference is obtained based on the first optical power, the second optical power, and the first target interference power. The target initial phase difference includes the initial phase difference between each of the non-reference path optical signals and the reference path optical signal. The first optical power is the single-channel optical power of the first reference path optical signal when the phase modulator of the reference path is in the initial state. The second optical power includes the single-channel optical power of each of the second target optical signals when the phase modulator of the reference path is in the initial state. The first interference power includes the power of each of the target interference optical signals when the phase modulator of the reference path is in the initial state. A target phase shift is applied to the phase modulator of the reference path, and a second interference power is obtained. The target phase difference is obtained based on the first interference power, the second interference power, and the target initial phase difference. The second interference power includes the power of each target interference optical signal when the phase modulator of the reference path applies the target phase shift. Based on the target phase difference, phase compensation is performed on each of the non-reference optical signals to obtain a phase-compensated target optical signal group. The output is a total synthesized optical signal based on the target optical signal group.
[0010] In a third aspect, embodiments of the present invention also provide a terminal device, wherein the terminal device includes a memory, a processor, and a coherent beam combining program for multi-aperture reception stored in the memory and executable on the processor. When the processor executes the coherent beam combining program for multi-aperture reception, it implements the steps of the coherent beam combining method for multi-aperture reception described above.
[0011] In a fourth aspect, the present invention provides a storage medium storing one or more programs that can be executed by one or more processors to implement the steps of the coherent beam combining method for multi-aperture reception as described in any of the preceding claims.
[0012] Beneficial effects: Compared with the prior art, the present invention provides a coherent beam combining system, method, terminal and storage medium for multi-aperture reception. The present invention provides a coherent beam combining system for multi-aperture reception, comprising a distributed receiving module, a phase modulation module, a power and interferometry module, and a conversion and control module, which are sequentially optically connected. The power and interferometry module includes a beam splitting component, an interferometric beam combining component, and a power detection component. The distributed receiving module receives multiple target optical signals and outputs them to the phase modulation module. The multiple target optical signals include one reference path optical signal and multiple non-reference path optical signals. The phase modulation module introduces independently modulated phase shifts into each of the multiple target optical signals. The beam splitting component includes a first reference path beam splitter, a second reference path beam splitter, and multiple non-reference path beam splitters. The first reference path beam splitter splits the reference path optical signal into a first reference path optical signal and a second reference path optical signal according to a first target ratio. The second reference path beam splitter splits the second reference path optical signal into multiple third reference path optical signals, the number of which is the same as the number of the multiple target optical signals. The non-reference path beam splitters split one of the non-reference path optical signals into a first target optical signal, a second reference path optical signal, and so on, according to a second target ratio. The system includes two target optical signals and a third target optical signal. The number of non-reference path beamsplitters is the same as the number of non-reference path optical signals, and each non-reference path beam splitter produces a different non-reference path optical signal. The interference combining component includes multiple fiber couplers, each connected to a third reference path optical signal and a third target optical signal. The third reference path optical signal and the third target optical signal connected to each fiber coupler are different. Each fiber coupler is used to interfere and combine the third reference path optical signal and the third target optical signal connected to it to obtain multiple target interference optical signals. The number of target interference optical signals is the same as the number of non-reference path optical signals. The power detection component is used to monitor the power of the reference path optical signal, the non-reference path optical signal, the interference optical signal output by the interference combining component, and the total combined optical signal. The conversion and control module is used to calculate the phase difference between each optical signal based on the power information obtained by the power detection component and generate a control signal to control the phase modulation module to achieve phase compensation for each optical signal. The coherent beam combining system for multi-aperture reception provided by this invention solves the problem in existing technologies that cannot achieve fast and accurate coherent combining of multiple target optical signals under dynamic disturbance environments. Through innovative optical path design, parallel processing architecture, and deterministic control mechanism, fast, accurate, and stable coherent combining of multiple target optical signals is achieved. Attached Figure Description
[0013] Figure 1A schematic diagram of the system structure of an embodiment of the coherent beam combining system for multi-aperture reception provided by the present invention; Figure 2 This is a flowchart illustrating an embodiment of the coherent beam combining method for multi-aperture reception provided by the present invention. Figure 3 A method loop diagram illustrating an embodiment of the coherent beam combining method for multi-aperture reception provided by the present invention; Figure 4 A schematic diagram of a terminal device provided in an embodiment of the present invention.
[0014] Explanation of reference numerals in the attached figures: 10. Distributed receiving module; 20. Phase modulation module; 30. Power and interferometry measurement module; 40. Conversion and control module; 50. Optical receiver; 11. Sub-aperture receiving unit; 21. Phase modulator; 31. Beam splitter assembly; 311. First reference path beam splitter; 312. Second reference path beam splitter; 313. Non-reference path beam splitter; 314. Overall beam splitter; 32. Interferometric beam combiner assembly; 321. Fiber optic coupler; 322. Overall beam combiner; 33. Power detection assembly; 331. Reference path power detection unit; 332. Non-reference path power detection unit; 333. Interferometric power detection unit; 334. Overall combined power detection unit; 41. DAC 42. Conversion unit; 43. Control unit; ADC Conversion unit.
[0015] Explanation of reference numerals in the attached figures: The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation
[0016] To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
[0017] Example 1 In existing technologies, free-space laser communication (including inter-satellite, satellite-to-ground, and ground-to-atmospheric laser communication) is a key technology for achieving high-speed, high-capacity information transmission. However, its communication links face a series of severe challenges. Ultra-long-distance transmission leads to extreme signal attenuation; atmospheric turbulence in satellite-to-ground and ground-to-atmospheric links causes signal flicker, phase distortion, and beam drift; furthermore, strong background light interference (such as solar interference) drastically degrades the received signal-to-noise ratio. To systematically address these problems, multi-aperture receiving technology is considered a promising solution. This technology, through the distributed deployment of multiple small-aperture sub-apertures working collaboratively, possesses two core advantages: firstly, it can synthesize an equivalent large receiving area, significantly improving light-gathering capability to overcome signal attenuation; secondly, utilizing its spatial diversity characteristics, each sub-aperture independently samples light signals that have passed through different paths and are affected by different turbulence, thereby effectively combating deep signal fading caused by atmospheric turbulence and improving the reliability of the communication link.
[0018] In this architecture, the efficient synthesis of signals received from each sub-aperture becomes crucial in determining the upper limit of system performance. Existing technologies mainly fall into two categories: "electrical domain synthesis" and "optical domain coherent synthesis." Electrical domain synthesis (also known as incoherent synthesis) equips each sub-aperture with an independent photodetector, directly converting the optical signal into an electrical signal before synthesizing multiple electrical signals. Optical domain coherent synthesis, on the other hand, aims to achieve coherent signal synthesis in the optical domain. A typical method involves coupling the beams received from each sub-aperture to a single-mode fiber, adjusting the phase of each path using optical phase shifters, and continuously applying random perturbation voltages to the phase shifters using a stochastic parallel gradient descent algorithm. Simultaneously, the synthesized output optical power is monitored, and the control voltage is iteratively updated based on power changes. Finally, the phase state that maximizes the synthesized optical power is searched, achieving phase locking and coherent synthesis.
[0019] However, both of the aforementioned existing technologies have significant limitations, making it difficult to fully unleash the potential of multi-aperture reception. The electric domain combining scheme is essentially an incoherent energy superposition, completely discarding the phase information carried by each sub-aperture signal. Its theoretical upper limit for the combined signal-to-noise ratio is far lower than that of coherent combining based on interference principles, and it cannot achieve the superposition gain of signal electric field amplitudes, resulting in limited performance improvement when receiving extremely weak signals. The stochastic parallel gradient descent algorithm used in optical domain coherent combining is a serial iterative random search, often requiring hundreds or even thousands of iterations to converge to the optimal solution. In dynamic environments where platform vibration and atmospheric turbulence cause rapid channel changes, the channel change rate often far exceeds the algorithm's convergence speed, making it difficult for the system to track and compensate for the rapid, independent phase changes introduced by spatial diversity in real time, leading to decreased combining efficiency or even loss of lock. Furthermore, the performance function upon which this algorithm relies may have multiple extreme points, easily getting trapped in local optima during the search process, failing to reach a globally optimal phase-locked state. This causes the system to operate in a non-optimal coherent combining state for extended periods, affecting both combining efficiency and stability.
[0020] Therefore, in this embodiment, a coherent beam combining system for multi-aperture reception with phase locking is proposed, which can achieve fast and high-precision coherent beam combining to obtain a combining gain and signal-to-noise ratio improvement close to the theoretical limit.
[0021] Specifically, such as Figure 1 As shown, the coherent beam combining system for multi-aperture reception provided in this embodiment includes a distributed receiving module 10, a phase modulation module 20, a power and interferometry measurement module 30, and a conversion and control module 40 connected in sequence. The power and interferometry measurement module 30 includes a beam splitting component 31, an interferometric beam combining component 32, and a power detection component 33.
[0022] The distributed receiving module 10 is used to receive multiple target optical signals and output them to the phase modulation module 20. The multiple target optical signals include one reference optical signal and multiple non-reference optical signals.
[0023] Specifically, refer to Figure 2 The distributed receiving module 10 includes multiple sub-aperture receiving units 11, used to receive the multi-path target optical signals after transmission through channels such as atmospheric turbulence. Specifically, in this embodiment, the distributed receiving module 10 consists of... N This is constituted by a distributed optical receiving unit, namely the sub-aperture receiving unit 11. In other words, in this embodiment, it includes a total of [number missing] distributed optical receiving units. N Strip aperture optical path for receiving N In this embodiment, the multiple target optical signals include the reference optical signal received by one reference path that is arbitrarily designated or randomly selected, and the multiple non-reference optical signals received by multiple non-reference paths respectively.
[0024] The phase modulation module 20 is used to introduce independently controlled phase shifts into the multiple target optical signals.
[0025] Specifically, the phase modulation module 20 is composed of N The system comprises several phase modulators 21, with one phase modulator 21 configured in each of the sub-aperture optical paths, located in each optical path. These phase modulators 21 can introduce precise and controllable minute phase shifts under the command of the control unit 42. Each phase modulator 21 can be independently controlled and serves as a key component for accurate phase difference measurement of the system. In this embodiment, an electro-optic phase modulator 21 is used.
[0026] The beam splitting component 31 includes a first reference path beam splitter 311, a second reference path beam splitter 312, and a plurality of non-reference path beam splitters 313. The first reference path beam splitter 311 is used to split the reference path optical signal into a first reference path optical signal and a second reference path optical signal according to a first target ratio. The second reference path beam splitter 312 is used to split the second reference path optical signal into multiple third reference path optical signals, the number of which is the same as the number of multiple target optical signals. The non-reference path beam splitter 313 is used to split one of the non-reference path optical signals into a first target optical signal, a second target optical signal, and a third target optical signal according to a second target ratio. The number of non-reference path beam splitters 313 is the same as the number of non-reference path optical signals, and the non-reference path optical signals split by each non-reference path beam splitter 313 are different.
[0027] Specifically, the first reference path beamsplitter 311 is located in the reference optical path, splitting the reference path optical signal into a first reference path optical signal and a second reference path optical signal according to the first target ratio. In this embodiment, the first target ratio is 10:90. In more embodiments, the second target ratio can also be set to other numbers according to actual conditions. The first reference path optical signal is used for interferometric measurements with each non-reference path, and the second reference path optical signal is used for directly measuring the single-path power of the reference path. The first reference path beamsplitter 311 ensures that the reference path signal can participate in multiple measurement processes simultaneously, providing the system with the necessary phase reference.
[0028] The second reference path beam splitter 312 is 1× N Fiber optic beam splitters, also used in the reference path, split the optical signal of the second reference path into two parts. N The third reference path optical signal is bundled, wherein the third reference path optical signal contains N -1 is used to interfere with each non-reference path, and the remaining path continues to participate in coherent synthesis.
[0029] The non-reference path beamsplitter 313 includes multiple 1×3 fiber beamsplitters, the number of which is the same as the number of non-reference path optical signals, and each non-reference path beamsplitter 313 is connected to one non-reference path. Each non-reference path beamsplitter 313 splits the optical signal of the corresponding sub-aperture into three paths according to a specific ratio of the second target ratio: the first target optical signal, the second target optical signal, and the third target optical signal. In this embodiment, the second target ratio is 80:10:10. In more embodiments, the second target ratio can be set to other numbers according to actual conditions. The first target optical signal includes most of the optical power and is used for final coherent combining; the second target optical signal is used to measure the single-path optical power of this path; and the third target optical signal is used for interferometry with the reference path. This three-path beam splitting design achieves perfect separation between main optical path combining and auxiliary phase monitoring.
[0030] The beam splitting component 31 also includes a beam splitter 314 connected to a beam combiner 322, used to split the synthesized optical signal synthesized by the beam combiner 322 into a first synthesized optical signal and a second synthesized optical signal according to a third target ratio.
[0031] Specifically, the beam splitter 314 is a 1×2 fiber beam splitter located after the output of the combiner 322. It splits the combined optical signal into a first combined optical signal and a second combined optical signal according to the third target ratio. In this embodiment, the second target ratio is 90:10. In more embodiments, the second target ratio can be set to other numbers according to actual conditions. The first combined optical signal includes most of the power and is used for final signal demodulation, while the second combined optical signal includes a small portion of the power and is used to monitor the total combined power. The beam splitter 314 ensures that the system can monitor the combining effect in real time without affecting the quality of the main signal.
[0032] The interference combining assembly 32 includes a plurality of fiber couplers 321, each fiber coupler 321 being connected to a third reference optical signal and a third target optical signal. The third reference optical signal and the third target optical signal connected to each fiber coupler 321 are different. Each fiber coupler 321 is used to interfere and combine the third reference optical signal and the third target optical signal connected to it to obtain multiple target interference optical signals. The number of target interference optical signals is the same as the number of non-reference optical signals.
[0033] Specifically, the multiple fiber optic couplers 321 perform pairwise interference combining of the monitoring optical signals from each non-reference path with the corresponding monitoring optical signals split from the reference path to form a... N-1 interference signal. In this embodiment, multiple fiber optic couplers 321 are used as the basic components for phase difference measurement, ensuring that stable interference can be generated between each signal and the reference path.
[0034] The interference combining assembly 32 further includes the total combiner 322, which is used to coherently combine the third reference path optical signal that has not passed through the fiber coupler 321 and all the first target optical signals to obtain the target composite optical signal.
[0035] Specifically, the bundle combiner 322 is N The ×1 fiber combiner is used to coherently combine all sub-aperture main path optical signals after phase compensation, and output a combined high-power optical signal. The total combiner 322 is the core device for achieving coherent combining in the coherent beam combining system for multi-aperture reception provided in this embodiment.
[0036] The power detection component 33 is used to monitor the power of the reference path optical signal, the non-reference path optical signal, the interference optical signal output by the interference beam combiner 32, and the total combined optical signal, respectively.
[0037] The power detection component 33 includes a reference path power detection unit 331, a non-reference path power detection unit 332, an interferometric power detection unit 333, and a total combined power detection unit 334. The reference path power detection unit 331 is used to monitor the single-path optical power of the first reference path optical signal to obtain the reference path optical power; The non-reference path power detection unit 332 is used to monitor the single-path optical power of each of the second target optical signals to obtain multiple non-reference path optical powers; The interference power detection unit 333 is used to monitor the power of each target interference optical signal to obtain the interference power; The total combined power detection unit 334 is used to monitor the power of the second combined optical signal and obtain the combined power.
[0038] Specifically, the reference path power detection unit 331 is connected to the monitoring optical path of the reference path and is used to accurately measure the single-path optical power of the reference path. The measured value of the single-path optical power of the reference path is one of the important input parameters for subsequent calculation of the phase difference.
[0039] The non-reference path power detection unit 332 is connected to the monitoring optical path of each non-reference path and is used to measure the single-path optical power value of each non-reference path. These power measurements, together with the reference path power, constitute the basic data for phase difference calculation.
[0040] The interference power detection unit 333 is connected to the output of each of the fiber optic couplers 321 and is used to detect the interference optical power between each non-reference path and the reference path, and to obtain the combined power between each path and the reference path. The power values of these interference signals contain the phase difference information between the two paths.
[0041] The total combined power detection unit 334 is used for monitoring N The total combined power output of the ×1 fiber combiner provides performance feedback for the system. By comparing the actual measured value with the theoretical maximum value, the phase compensation effect and system stability can be verified.
[0042] The conversion and control module 40 is used to calculate the phase difference between each optical signal based on the power information obtained by the power detection component 33, and generate a control signal to control the phase modulation module 20 to achieve phase compensation for each optical signal.
[0043] The conversion and control module 40 includes DAC Conversion unit 41, control unit 42 and ADC Conversion unit 43; The DAC The conversion unit 41 is used to receive the digital signal from the control unit 42 and convert it into an analog voltage to drive the phase modulation module 20 to regulate the phase shift of the optical signal; The control unit 42 is used to obtain the phase difference corresponding to each of the reference path optical signals based on the reference path optical power, the non-reference path optical power and the interference power, and generate a control signal for driving the phase modulation module 20, so as to perform phase compensation for each of the reference path optical signals based on the phase modulation module 20; The ADC The conversion unit 43 receives the analog signal from the power detection component 33 and converts it into a digital signal, which is then sent to the control unit 42.
[0044] Specifically, the DAC The conversion unit 41 is a digital-to-analog converter, used to receive the digital signals from the control unit 42 and convert them into analog voltages to drive the phase modulation module 20 and each adjustable phase shifter. DAC The conversion accuracy and speed of the conversion unit 41 directly affect the phase control accuracy and response speed of the system.
[0045] The control unit 42 is the intelligent core of the coherent beam combining system for multi-aperture reception described in this embodiment, and receives signals from the... ADC The power measurement signal is used to calculate the phase difference between each beam in real time using the algorithm according to the present invention, determine the required phase compensation amount, and generate a control signal to drive the beam. DACThe converter. The control unit 42 can be... FPGA , DSP Alternatively, it can be implemented using a high-speed microprocessor to ensure real-time computation and control.
[0046] The ADC The conversion unit 43 is also an analog-to-digital converter, used to convert the analog signal detected by the power detection component 33 into a digital signal for processing by the control unit 42. ADC The sampling rate and accuracy of the conversion unit 43 also directly affect the accuracy of phase measurement and the system response speed.
[0047] The coherent beam combining system for multi-aperture reception also includes: Optical receiver 50 is used to receive the first synthesized optical signal and adjust the first synthesized optical signal to obtain the target transmission content and output it.
[0048] Specifically, the optical receiver 50 is used to perform final demodulation on the received composite optical signal. The composite optical signal can be the first composite optical signal or a composite optical signal generated after modulation by the phase modulation module 20, to obtain the transmitted information content. The optical receiver 50 is the signal output terminal of the entire system, and high-quality coherent synthesis will directly improve the performance of the receiver.
[0049] Specifically, in this embodiment, the working principle of the entire coherent beam combining system for multi-aperture reception is as follows: N Each of the sub-aperture receiving units 11 receives signal light transmitted through channels such as atmospheric turbulence. Each signal light first passes through its corresponding phase modulator 21. For the reference path, the signal is split into two paths after passing through the first reference path beam splitter 311: one path enters the reference path power detection unit 331 to measure the single-path power, and the other path enters the second reference path beam splitter 312 dedicated to the reference path to split the reference light. N The road, among which N -1 paths interfere with each non-reference path, and the remaining path continues to participate in coherent combining. For non-reference paths, each signal is split into three paths by its respective non-reference path beamsplitter 313: the first target optical signal, the second target optical signal, and the third target optical signal. The main path (the first target optical signal, containing most of the power) enters the total combiner 322 for coherent combining; the second target optical signal enters its corresponding non-reference path power detection unit 332 to measure the power of each path; the third target optical signal enters its corresponding fiber coupler 321 and interferes with the corresponding reference light from the second reference path beamsplitter 312, and the interference power is measured by the interference power detection unit. All power measurements are processed by the... ADCAfter conversion by the conversion unit 43, the signal is sent to the control unit 42. The control unit 42 calculates the phase difference of each path according to the coherent beam combining method of multi-aperture reception and generates a control signal. DAC The conversion unit 41 drives the phase modulation module 20 to achieve precise phase compensation. The synthesized optical signal is output by the beam combiner 322, and then split into two paths by the beam splitter 314: one path enters the optical receiver 50 for signal demodulation, and the other path is used by the total combining power detection unit 334 to monitor the combining effect, forming a complete closed-loop control.
[0050] As can be seen, this system achieves parallel and direct measurement of the phase of each sub-aperture signal by constructing a star-shaped interferometric measurement network centered on a single reference beam and integrating a power monitoring optical path. This architecture allows for the simultaneous acquisition of phase information from all channels, providing a hardware foundation for one-time global phase compensation and avoiding the time delay caused by serial or iterative measurements in traditional schemes.
[0051] Furthermore, this system achieves physical separation and parallel execution of measurement and compensation. Phase measurement is performed through an independent monitoring optical path, without affecting the synthesis path of the main signal optical path; after obtaining the accurate phase difference, the system performs one-time synchronous compensation for each main signal optical path through an independent phase modulator array 21. This parallel architecture ensures the high efficiency and real-time performance of the phase correction process.
[0052] Furthermore, this system forms a complete closed-loop control physical link through multi-channel power sensing and feedback monitoring. The total combined power sensing provides direct physical feedback on system performance, enabling the system to autonomously determine when phase measurement and compensation need to be repeated, thereby achieving adaptive tracking capability for dynamic channels at the hardware level.
[0053] In summary, this embodiment provides a coherent beam combining system for multi-aperture reception, comprising a distributed receiving module, a phase modulation module, a power and interferometry measurement module, and a conversion and control module connected sequentially. The power and interferometry measurement module includes a beam splitting component, an interferometric beam combining component, and a power detection component. The distributed receiving module receives multiple target optical signals and outputs them to the phase modulation module. The multiple target optical signals include one reference optical signal and multiple non-reference optical signals. The phase modulation module introduces independently modulated phase shifts into each of the multiple target optical signals. The beam splitting component includes a first reference beam splitter, a second reference beam splitter, and multiple non-reference beam splitters. The first reference beam splitter splits the reference optical signal into a first reference optical signal and a second reference optical signal according to a first target ratio. The second reference beam splitter splits the second reference optical signal into multiple third reference optical signals, the number of which is the same as the number of multiple target optical signals. The non-reference beam splitters split one of the non-reference optical signals into a first target optical signal according to a second target ratio. The system comprises an optical signal, a second target optical signal, and a third target optical signal. The number of non-reference path beamsplitters is the same as the number of non-reference path optical signals, and each non-reference path beam splitter produces a different non-reference path optical signal. The interference combining assembly includes multiple fiber couplers, each connected to a third reference path optical signal and a third target optical signal. The third reference path optical signal and the third target optical signal connected to each fiber coupler are different. Each fiber coupler is used to interfere and combine the third reference path optical signal and the third target optical signal connected to it to obtain multiple target interference optical signals. The number of target interference optical signals is the same as the number of non-reference path optical signals. The power detection assembly is used to monitor the power of the reference path optical signal, the non-reference path optical signal, the interference optical signal output by the interference combining assembly, and the total combined optical signal. The conversion and control module is used to calculate the phase difference between each optical signal based on the power information obtained by the power detection assembly and generate a control signal to control the phase modulation module to achieve phase compensation for each optical signal. The coherent beam combining system for multi-aperture reception provided in this embodiment solves the problem in the prior art of being unable to achieve fast and accurate coherent combining of multiple target optical signals under dynamic disturbance environments. Through innovative optical path design, parallel processing architecture, and deterministic control mechanism, fast, accurate, and stable coherent combining of multiple target optical signals is achieved.
[0054] Example 2 Based on the above embodiments, the present invention also provides a coherent beam combining method for multi-aperture reception, such as... Figure 2As shown, the coherent beam combining method for multi-aperture reception provided in this embodiment includes the following steps: S 100. Set the phase modulator of the reference path to the initial state, obtain the first optical power, the second optical power, and the first interference power, and obtain the target initial phase difference based on the first optical power, the second optical power, and the first target interference power. The target initial phase difference includes the initial phase difference between each of the non-reference path optical signals and the reference path optical signal. The first optical power is the single-channel optical power of the first reference path optical signal when the phase modulator of the reference path is in the initial state. The second optical power includes the single-channel optical power of each of the second target optical signals when the phase modulator of the reference path is in the initial state. The first interference power includes the power of each of the target interference optical signals when the phase modulator of the reference path is in the initial state.
[0055] Obtaining the initial phase difference of the target based on the first optical power, the second optical power, and the first target interference power includes: Based on the first optical power, the second optical power, and the first target interference power, a target cosine value is obtained. The target cosine value includes the cosine value of the phase difference between each non-reference path optical signal and the reference path optical signal when the phase modulator of the reference path is in its initial state.
[0056] Specifically, refer to Figure 3 First, the initial state is set: the control module first controls the phase modulator of the reference path to be in the initial state, that is... The reference route can be chosen arbitrarily, and is denoted as the [number]. road( It can be 1 to (Of any path in the spectrum, the one with the highest signal-to-noise ratio is usually selected).
[0057] Then, synchronous power acquisition: The control unit synchronously acquires all power data, including the first optical power and the second optical power, specifically from each individual power source. Simultaneously, it also includes the first interference power, i.e., the power between each path and the reference path. Combined power: Total combined power Data collection will not be performed for now; it will be used for subsequent system verification.
[0058] Then, the initial phase difference of the target is obtained based on the first optical power, the second optical power, and the first target interference power.
[0059] Specifically, for each non-reference path ( to , Its complex amplitude of light field is The reference light field is Then, the combined power after the interference of the two beams is calculated based on the first formula, which is:
[0060] in, For reference, the road and the first i The power after coupling of the non-reference path, The reference path power, For reference road phase, For the first i Road power, For the first i Road phase.
[0061] In this embodiment, the initial phase difference of the target is defined as... Then, from the first formula, we can obtain:
[0062] This yields the initial phase difference of the target. The cosine value, but because The initial phase difference of the target cannot be determined. The sign indicates the existence of phase ambiguity. A possible solution for the initial phase difference of the target is... or Therefore, phase ambiguity resolution is required.
[0063] S 200. Apply a target phase shift to the phase modulator of the reference path and obtain a second interference power. Obtain a target phase difference based on the first interference power, the second interference power and the target initial phase difference. The second interference power includes the power of each target interference optical signal when the phase modulator of the reference path applies the target phase shift.
[0064] Obtaining the target phase difference based on the first interference power, the second interference power, and the initial target phase difference includes: The third optical power and the fourth optical power are obtained. The third optical power is the single-channel optical power of the first reference path optical signal when the phase modulator of the reference path applies the target phase offset. The fourth optical power includes the single-channel optical power of each second target optical signal when the phase modulator of the reference path applies the target phase offset. The target sine value is obtained based on the third optical power, the fourth optical power, the second interference power and the target cosine value. The target sine value is the sine value of the phase difference between each non-reference path optical signal and the reference path optical signal when the phase modulator of the reference path applies the target phase offset. The target phase difference is obtained based on the sign of the target cosine and target sine values corresponding to each of the non-reference optical signals.
[0065] Specifically, the control unit drives the reference path r The corresponding phase modulator, for the reference path r The corresponding phase modulator applies a known, non- Integer multiples of phase shift At this point, the reference path light field becomes Then, a secondary power measurement is performed to measure the combined power of each non-reference path and the current reference path. .
[0066] Specifically, under the new reference phase, the formula for combined power becomes the second formula:
[0067] Using trigonometric identities And substitute it into the result obtained in step one Thus, we can obtain the third formula:
[0068] After simplification, the solution can be obtained based on the fourth formula. The fourth formula is:
[0069] When choosing hour, , The fourth formula can be simplified to the fifth formula:
[0070] Thus, for each Then it simultaneously possesses the other chord values. Sine value By determining the signs of these two values, we can find the range... Uniquely and precisely determined The specific value, In this way, the phase ambiguity problem is completely solved.
[0071] S300. Perform phase compensation on each of the non-reference optical signals based on the target phase difference to obtain a phase-compensated target optical signal group.
[0072] Specifically, in this embodiment, a one-time phase compensation and synthesis are also included.
[0073] First, perform global phase compensation calculations: This involves uniquely determining all... relative phase difference ( to , Afterward, the control unit immediately calculates the compensation amount required to make all optical paths co-phase. The goal is to align the phase of all optical paths to the phase of the reference path. Then the first The phase that needs to be compensated for is (Right now ).
[0074] Then, synchronous phase compensation is performed. Specifically, the control unit applies all calculated compensation voltages / signals synchronously to the phase modulation module at once. This global synchronous compensation strategy avoids the local extremum problem and convergence oscillation phenomenon in traditional iterative algorithms.
[0075] Then, high-efficiency coherent combining is performed. Specifically, at this point, all main optical signals are in phase when they reach the combiner, achieving high-efficiency coherent combining, and the output power approaches the theoretical maximum value.
[0076] This value is much larger than that of incoherent synthesis. This demonstrates the significant gain brought about by coherent synthesis.
[0077] The output, based on the total synthesized optical signal corresponding to the target optical signal group, further includes: Real-time monitoring of the synthesis efficiency of the total synthesized optical signal; When the synthesis efficiency is lower than a preset threshold, the step of obtaining the target initial phase difference is repeated until the synthesis efficiency is higher than the preset threshold.
[0078] Specifically, this embodiment also includes closed-loop monitoring and dynamic tracking: the system monitors the combining efficiency in real time through the total combining power detection unit. When a decrease in combining efficiency due to atmospheric turbulence or platform vibration is detected, a new round of phase measurement and compensation is automatically triggered. Since the coherent beam combining method for multi-aperture receivers provided in this embodiment only requires two power measurements and simple algebraic operations, the entire locking process can be completed in microseconds, which is much faster than traditional methods. SPGDThe algorithm (on the order of milliseconds / seconds) is capable of tracking rapidly changing dynamic channels in real time.
[0079] S 400. Output the total synthesized optical signal based on the target optical signal group.
[0080] Finally, the total synthesized optical signal is generated and output based on all the main optical signals after each phase adjustment.
[0081] As can be seen, in this embodiment, deterministic analytical calculation is used instead of traditional random iterative search. By cleverly introducing a reference path phase offset and performing secondary measurement, the phase ambiguity problem is solved, achieving microsecond-level fast phase locking and high-precision compensation, and fully releasing the theoretical performance potential of multi-aperture receiver coherent synthesis.
[0082] Specifically, the coherent beam combining method for multi-aperture reception provided in this embodiment achieves fast and high-precision phase locking at the microsecond level. It abandons the traditional algorithm that relies on random perturbation and iterative search, instead employing an analytical calculation method based on power measurement. This innovation transforms the phase locking process from a slow search requiring hundreds of trial iterations into a one-time direct calculation and execution, increasing the locking time from milliseconds or seconds to the microsecond level. This allows for real-time tracking of rapid dynamic phase changes caused by atmospheric turbulence, fundamentally solving the problems of slow convergence and susceptibility to local optima in traditional algorithms. Furthermore, the coherent beam combining method for multi-aperture reception provided in this embodiment uniquely determines the precise phase difference of each channel by introducing a controllable phase offset of the reference path and performing secondary measurements. This completely solves the phase sign ambiguity problem in traditional interferometry, ensuring the accuracy and reliability of phase control and laying a solid foundation for one-time global precise phase tuning. Ultimately, the coherent beam combining method for multi-aperture reception provided in this embodiment achieves true optical domain coherent combining, enabling the system to obtain combining gain and signal-to-noise ratio improvement close to the theoretical limit, fully leveraging the technical potential of multi-aperture reception, and its performance is significantly better than incoherent electrical domain combining schemes.
[0083] In summary, this embodiment provides a coherent beam combining method for multi-aperture reception. During coherent beam combining, the phase modulator of the reference path is set to an initial state, and then a first optical power, a second optical power, and a first interference power are obtained. Based on the first optical power, the second optical power, and the first target interference power, a target initial phase difference is obtained. The target initial phase difference includes the initial phase difference between each of the non-reference path optical signals and the reference path optical signal. The first optical power is the single-path optical power of the first reference path optical signal when the phase modulator of the reference path is in its initial state. The second optical power includes the initial phase difference of each of the second target optical signals when the phase modulator of the reference path is in its initial state. The single-channel optical power of the signal is calculated. The first interference power includes the power of each target interference optical signal when the phase modulator of the reference path is in its initial state. Then, a target phase shift is applied to the phase modulator of the reference path, and a second interference power is obtained. Based on the first interference power, the second interference power, and the initial target phase difference, a target phase difference is obtained. The second interference power includes the power of each target interference optical signal when the phase modulator of the reference path applies the target phase shift. Finally, phase compensation is performed on each of the non-reference path optical signals based on the target phase difference to obtain a phase-compensated target optical signal group. This allows the output of the total synthesized optical signal corresponding to the target optical signal group. This embodiment provides a coherent beam combining method for multi-aperture reception, solving the problem in existing technologies where fast and accurate coherent combining of multiple target optical signals cannot be achieved under dynamic disturbance environments. By cleverly introducing a reference path phase shift and performing secondary measurements, the phase ambiguity problem is solved, achieving microsecond-level fast phase locking and high-precision compensation, fully releasing the theoretical performance potential of coherent combining in multi-aperture reception.
[0084] It should be understood that although the steps in the flowcharts shown in the accompanying drawings are displayed sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of the steps in this invention, and these steps can be executed in other orders. Moreover, at least a portion of the steps in this invention may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least a portion of the sub-steps or stages of other steps.
[0085] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program using signal-related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided by this invention can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM). ROM Programmable ROM ( PROM ), electrically programmable ROM ( EPROM Electrically erasable programmable ROM ( EEPROM ) or flash memory. Volatile memory may include random access memory (RAM) RAM Alternatively, an external cache memory. This is for illustrative purposes only and not as a limitation. RAM It can be obtained in various forms, such as static RAM ( SRAM ),dynamic RAM ( DRAM ),synchronous DRAM ( SDRAM ), double data rate SDRAM ( DDRSDRAM ), Enhanced SDRAM ( ESDRAM ), Synchronization Link ( Synchlink ), DRAM ( SLDRAM ), memory bus ( Rambus )direct RAM ( RDRAM ), Direct Memory Bus Dynamics RAM ( DRDRAM ), and memory bus dynamics RAM ( RDRAM )wait.
[0086] Example 3 Based on the above embodiments, the present invention also provides a terminal device, the schematic diagram of which can be as follows: Figure 4 As shown. The terminal device may include one or more processors 100 ( Figure 4(Only one is shown in the image), memory 101, and a computer program 102 stored in memory 101 and executable on one or more processors 100, such as a coherent beam combining method program for multi-aperture reception. When one or more processors 100 execute computer program 102, they can implement various steps in the embodiments of the coherent beam combining method for multi-aperture reception. Alternatively, when one or more processors 100 execute computer program 102, they can implement the functions of various modules / units in the embodiments of the coherent beam combining method for multi-aperture reception, which is not limited here.
[0087] In one embodiment, the processor 100 may be a central processing unit (CPU). Central Processing Unit , CPU It can also be other general-purpose processors, digital signal processors (DSPs), etc. Digital Signal Processor , DSP Application-Specific Integrated Circuits (ASICs) Application Specific Integrated Circuit , ASIC ), ready-made programmable gate arrays ( Field - Programmable Gate Array , FPGA Or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor, etc.
[0088] In one embodiment, memory 101 may be an internal storage unit of the electronic device, such as a hard drive or memory. Memory 101 may also be an external storage device of the electronic device, such as a plug-in hard drive or smart memory card. smart media card , SMC ), Secure Digital ( secure digital , SD ) card, flash memory card ( flash card Furthermore, the memory 101 may include both internal storage units and external storage devices of the electronic device. The memory 101 is used to store computer programs and other programs and data required by the terminal device. The memory 101 can also be used to temporarily store data that has been output or will be output.
[0089] Those skilled in the art will understand that Figure 4 The block diagram shown is merely a partial structural diagram related to the present invention and does not constitute a limitation on the terminal device to which the present invention is applied. The specific terminal device may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.
[0090] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, operational databases, or other media used in the embodiments provided by this invention can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM). ROM Programmable ROM ( PROM ), electrically programmable ROM ( EPROM Electrically erasable programmable ROM ( EEPROM ) or flash memory. Volatile memory may include random access memory (RAM) RAM Alternatively, an external cache memory. This is for illustrative purposes only and not as a limitation. RAM It can be obtained in various forms, such as static RAM ( SRAM ),dynamic RAM ( DRAM ),synchronous DRAM ( SDRAM ), dual operational data rate SDRAM ( DDRSDRAM ), Enhanced SDRAM ( ESDRAM ), Synchronization Link ( Synchlink ) DRAM ( SLDRAM ), memory bus ( Rambus )direct RAM ( RDRAM ), Direct Memory Bus Dynamics RAM ( DRDRAM ), and memory bus dynamics RAM ( RDRAM )wait.
[0091] Example 4 The present invention also provides a storage medium storing one or more programs that can be executed by one or more processors to implement the steps of the coherent beam combining method for multi-aperture reception described in the above embodiments.
[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A coherent beam combining system for multi-aperture reception, characterized in that, The coherent beam combining system for multi-aperture reception includes a distributed receiving module, a phase modulation module, a power and interferometric measurement module, and a conversion and control module that are optically connected in sequence. The power and interferometric measurement module includes a beam splitting component, an interferometric beam combining component, and a power detection component. The distributed receiving module is used to receive multiple target optical signals and output them to the phase modulation module. The multiple target optical signals include one reference optical signal and multiple non-reference optical signals. The phase modulation module is used to introduce independently modulated phase shifts into the multiple target optical signals respectively; The beam splitting assembly includes a first reference path beam splitter, a second reference path beam splitter, and multiple non-reference path beam splitters. The first reference path beam splitter is used to split the reference path optical signal into a first reference path optical signal and a second reference path optical signal according to a first target ratio. The second reference path beam splitter is used to split the second reference path optical signal into multiple third reference path optical signals, the number of which is the same as the number of multiple target optical signals. The non-reference path beam splitter is used to split one of the non-reference path optical signals into a first target optical signal, a second target optical signal, and a third target optical signal according to a second target ratio. The number of non-reference path beam splitters is the same as the number of non-reference path optical signals, and the non-reference path optical signals split by each non-reference path beam splitter are different. The interference combining assembly includes multiple fiber couplers, each fiber coupler being connected to a third reference path optical signal and a third target optical signal. The third reference path optical signal and the third target optical signal connected to each fiber coupler are different. Each fiber coupler is used to interfere and combine the third reference path optical signal and the third target optical signal connected to it to obtain multiple target interference optical signals. The number of target interference optical signals is the same as the number of non-reference path optical signals. The power detection component is used to monitor the power of the reference path optical signal, the non-reference path optical signal, the interference optical signal output by the interference beam combiner component, and the total combined optical signal, respectively. The conversion and control module is used to calculate the phase difference between each optical signal based on the power information obtained by the power detection component, and to generate a control signal to control the phase modulation module in order to achieve phase compensation for each optical signal.
2. The coherent beam combining system for multi-aperture reception according to claim 1, characterized in that, The interference beam combining assembly further includes a beam combiner, used to coherently combine the third reference path optical signal that has not passed through the fiber coupler and all the first target optical signals to obtain the target composite optical signal; The beam splitting component also includes a beam splitter connected to the beam combiner, used to split the synthesized optical signal into a first synthesized optical signal and a second synthesized optical signal according to a third target ratio.
3. The coherent beam combining system for multi-aperture reception according to claim 2, characterized in that, The power detection component includes a reference path power detection unit, a non-reference path power detection unit, an interferometric power detection unit, and a total combined power detection unit; The reference path power detection unit is used to monitor the single-path optical power of the first reference path optical signal to obtain the reference path optical power; The non-reference path power detection unit is used to monitor the single-path optical power of each of the second target optical signals to obtain multiple non-reference path optical powers; The interference power detection unit is used to monitor the power of each target interference optical signal to obtain the interference power; The total combined power detection unit is used to monitor the power of the second combined optical signal and obtain the combined power.
4. The coherent beam combining system for multi-aperture reception according to claim 3, characterized in that, The conversion and control module includes DAC Conversion unit, control unit and ADC Conversion unit; The DAC The conversion unit is used to receive the digital signal from the control unit and convert it into an analog voltage to drive the phase modulation module to regulate the phase shift of the optical signal; The control unit is used to obtain the phase difference corresponding to each of the reference path optical signals based on the reference path optical power, the non-reference path optical power and the interference power, and generate a control signal for driving the phase modulation module, so as to perform phase compensation for each of the reference path optical signals based on the phase modulation module; The ADC The conversion unit receives the analog signal from the power detection component and converts it into a digital signal, which is then sent to the control unit.
5. The coherent beam combining system for multi-aperture reception according to claim 2, characterized in that, The coherent beam combining system for multi-aperture reception also includes: An optical receiving module is used to receive the first synthesized optical signal and adjust the first synthesized optical signal to obtain the target transmission content and output it.
6. A method for coherent beam combining for multi-aperture receivers, characterized in that, The method for coherent beam combining for multi-aperture reception, using the coherent beam combining system for multi-aperture reception as described in any one of claims 1-5, comprises: The phase modulator of the reference path is set to the initial state. The first optical power, the second optical power, and the first interference power are obtained. The target initial phase difference is obtained based on the first optical power, the second optical power, and the first target interference power. The target initial phase difference includes the initial phase difference between each of the non-reference path optical signals and the reference path optical signal. The first optical power is the single-channel optical power of the first reference path optical signal when the phase modulator of the reference path is in the initial state. The second optical power includes the single-channel optical power of each of the second target optical signals when the phase modulator of the reference path is in the initial state. The first interference power includes the power of each of the target interference optical signals when the phase modulator of the reference path is in the initial state. A target phase shift is applied to the phase modulator of the reference path, and a second interference power is obtained. The target phase difference is obtained based on the first interference power, the second interference power, and the target initial phase difference. The second interference power includes the power of each target interference optical signal when the phase modulator of the reference path applies the target phase shift. Based on the target phase difference, phase compensation is performed on each of the non-reference optical signals to obtain a phase-compensated target optical signal group. The output is a total synthesized optical signal based on the target optical signal group.
7. The coherent beam combining method for multi-aperture reception according to claim 6, characterized in that, Obtaining the initial phase difference of the target based on the first optical power, the second optical power, and the first target interference power includes: Based on the first optical power, the second optical power, and the first target interference power, a target cosine value is obtained. The target cosine value includes the cosine value of the phase difference between each non-reference path optical signal and the reference path optical signal when the phase modulator of the reference path is in its initial state.
8. The coherent beam combining method for multi-aperture reception according to claim 7, characterized in that, Obtaining the target phase difference based on the first interference power, the second interference power, and the initial target phase difference includes: The third optical power and the fourth optical power are obtained. The third optical power is the single-channel optical power of the first reference path optical signal when the phase modulator of the reference path applies the target phase offset. The fourth optical power includes the single-channel optical power of each second target optical signal when the phase modulator of the reference path applies the target phase offset. The target sine value is obtained based on the third optical power, the fourth optical power, the second interference power and the target cosine value. The target sine value is the sine value of the phase difference between each non-reference path optical signal and the reference path optical signal when the phase modulator of the reference path applies the target phase offset. The target phase difference is obtained based on the sign of the target cosine and target sine values corresponding to each of the non-reference optical signals.
9. The coherent beam combining method for multi-aperture reception according to claim 6, characterized in that, The output, based on the total synthesized optical signal corresponding to the target optical signal group, further includes: Real-time monitoring of the synthesis efficiency of the total synthesized optical signal; When the synthesis efficiency is lower than a preset threshold, the step of obtaining the target initial phase difference is repeated until the synthesis efficiency is higher than the preset threshold.
10. A terminal device, characterized in that, The terminal device includes a memory, a processor, and a coherent beam combining program for multi-aperture reception stored in the memory and executable on the processor. When the processor executes the coherent beam combining program for multi-aperture reception, it implements the steps of the coherent beam combining method for multi-aperture reception as described in any one of claims 6-9.
11. A storage medium, characterized in that, The storage medium stores one or more programs, which can be executed by one or more processors to implement the steps of the coherent beam combining method for multi-aperture reception as described in any one of claims 6-9.