Adjustable multi-aperture laser communication receiving system

Abstract

An adjustable multi-aperture laser communication receiving system belongs to the technical field of visible light communication, aims to solve the problems in the prior art, and comprises a plurality of receiving telescopes in a receiving telescope array, the receiving telescopes are correspondingly arranged on a plurality of motors respectively, and the motors are connected to a connecting rod. The plurality of narrow-band optical filters are correspondingly arranged at the emergent ends of the plurality of receiving telescopes respectively, and the target surfaces of the plurality of photoelectric detectors are located at the focal plane positions of the plurality of receiving telescopes respectively; the plurality of photoelectric detectors are connected with the merging circuit module, the merging circuit module is connected with the digital-to-analog conversion module, the digital-to-analog conversion module is connected with the demodulation module, and the demodulation module is connected with the main control computer; the main control computer is respectively connected with the controller and the radar, and the controller is connected with the plurality of motors; the main control computer drives the multiple motors through the controller to change the relative positions, the pitch angles and the left-right angles of the receiving telescopes and the connecting rods. During cross-air-sea interface laser communication, the communication performance of the receiving system is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of visible light communication, and in particular relates to an adjustable multi-aperture laser communication receiving system that can be used across air-sea interfaces. Background Art

[0002] Visible light communication (VLC) is a high-tech technology in the communications field, offering numerous advantages, including high communication capacity, excellent confidentiality, strong resistance to electromagnetic interference, compact equipment, light weight, low power consumption, and the absence of a radio frequency license. Since the advent of lasers, with the continuous advancement and development of optoelectronic devices, VLC has gradually moved from theoretical and experimental research to the application stage.

[0003] As an essential component of visible light communication, laser communication across the air-sea interface is also a key technology in ocean observation. The uplink and downlink transmission channels for lasers in this environment are relatively complex. Especially at the air-sea interface, random fluctuations in the sea surface can cause the light spot on the receiving surface to expand, flicker, and drift, resulting in changes in communication performance. These changes can manifest as fluctuations in the received signal intensity, severely impacting key system performance such as the signal-to-noise ratio and bit error rate during communication. In strong sea waves, severe interference can even cause the optical signal to miss its target, resulting in short-term communication interruptions.

[0004] To mitigate the impact of channels on visible light communication system performance, a multi-aperture array can be used at the receiving end of the communication system. Multi-aperture receiving technology typically exploits the channel incorrelations between different apertures, providing the receiving system with multiple copies of the same signal through independent fading channels. This minimizes the probability of all copies experiencing strong signal fading simultaneously. By combining the received signals appropriately at the receiving end, the intensity of signal fading can be reduced, improving the performance of the space communication system. There are many potential advantages to utilizing multi-aperture receiving technology in space optical communication systems. For example, multi-aperture receiving technology has long been extensively researched and applied in radio frequency technology. Furthermore, from an economic perspective, the production cost of multiple small-aperture receiving telescopes is significantly lower than that of a single large-aperture receiving telescope. From a processing and assembly perspective, the production and assembly of multiple small-aperture receiving telescopes is also much easier than that of a single large-aperture receiving telescope. Furthermore, the multi-aperture receiving structure effectively reduces the possibility of temporary obstruction of the laser signal by obstacles such as flocks of birds or clouds, thereby improving the stability of the laser communication system.

[0005] Chinese patent application number "202310454872.4" and titled "Multi-aperture receiving device, spatial optical receiver and communication system" discloses a multi-aperture receiving device, including a spatial optical receiving unit and a phase-controlled optical path. The phase-controlled optical path is a cascade structure. The spatial optical receiving unit includes multiple receiving apertures, and each M1 receiving aperture corresponds to a first-level sub-phase control unit, and the output port of each M2 first-level sub-phase control unit corresponds to a second-level sub-phase control unit. By analogy, the output port of each MN N-1-level sub-phase control unit corresponds to an N-level sub-phase control unit, and the output port of the N-level sub-phase control unit serves as the total output port. However, the receiving aperture in its scheme cannot be moved and adjusted in angle as a whole or individually. When used for laser communication across the air-sea interface, it has limited effect in eliminating the influence of sea surface waves in the channel. Summary of the Invention

[0006] In order to solve the problem in the prior art that the receiving apertures cannot be moved and the angle cannot be adjusted as a whole or individually, the present invention proposes an adjustable multi-aperture laser communication receiving system.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] An adjustable multi-aperture laser communication receiving system, comprising: a receiving telescope array, multiple motors, connecting rods, multiple narrowband filters, multiple photodetectors, a combining circuit module, a digital-to-analog conversion module, a demodulation module, a main control computer, a controller, and a radar;

[0009] The multiple receiving telescopes in the receiving telescope array are respectively arranged on multiple motors, the multiple motors are connected to the connecting rod, the multiple narrow-band filters are respectively arranged at the output ends of the multiple receiving telescopes, and the target surfaces of the multiple photoelectric detectors are respectively located at the focal plane positions of the multiple receiving telescopes; the multiple photoelectric detectors are connected to the merging circuit module, the merging circuit module is connected to the digital-to-analog conversion module, the digital-to-analog conversion module is connected to the demodulation module, and the demodulation module is connected to the main control computer; the main control computer is respectively connected to the controller and the radar, and the controller is connected to the multiple motors; the main control computer drives the multiple motors through the controller to change the relative position, pitch angle, and left-right angle of each receiving telescope and the connecting rod, thereby realizing the up and down movement of each receiving telescope and the adjustment of the pitch angle and left-right angle.

[0010] During operation, the radar first detects and collects wave profile data and transmits the obtained wave profile data to the main control computer. The main control computer calculates the energy distribution at different angles after refraction in real time based on the wave profile data and the law of refraction of light, and determines the propagation angle with higher energy. The main control computer then transmits the calculated data to the controller, which controls multiple motors to adjust the relative position and angle of the receiving telescope array and the connecting rod, so that the telescope array receives the signal light to the maximum extent and makes it directly incident on the receiving system.

[0011] The receiving telescope array converges the received communication light beams, filters out stray light from other bands through a narrowband filter, and focuses the signal light onto the detection target surface of the photodetector. The photodetector converts the optical signal into an electrical signal, which is transmitted to the merging circuit module. The merging circuit module merges multiple independent electrical signals into one electrical signal; the electrical signal at this time is an analog signal, which is then converted into a digital signal by the digital-to-analog conversion module. The demodulation module demodulates the signal and transmits it to the main control computer for display, completing the reception of the information.

[0012] The present invention has the following beneficial effects: The main control computer uses sea level data collected by radar to continuously adjust the position and angle of the receiving telescope array on the connecting rod, thereby ensuring maximum signal light reception and normal incidence on the receiving system, thereby improving the communication system's signal-to-noise ratio, bit error rate, and other key communication indicators. During laser communications across the air-sea interface, the present invention effectively suppresses the impact of ocean waves on the communication system's performance, improving the communication performance of the receiving system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The figure is a schematic structural diagram of an adjustable multi-aperture optical communication receiving system of the present invention.

[0014] Figure 2 This is a schematic diagram of an embodiment of the present invention: a receiving telescope array adopts a 3*3 array arrangement.

[0015] Figure 3 This is a schematic diagram of adjusting the position and angle of a receiving telescope array on a connecting rod according to an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The following will provide a clear and complete description of the technical solutions in the embodiments of the present disclosure in conjunction with the embodiments and the drawings in the embodiments. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present disclosure.

[0017] like Figure 1As shown, an adjustable multi-aperture laser communication receiving system includes: a receiving telescope array 1, multiple motors 2, a connecting rod 3, multiple narrowband filters 4, multiple photodetectors 5, a merging circuit module 6, a digital-to-analog conversion module 7, a demodulation module 8, a main control computer 9, a controller 10 and a radar 11.

[0018] The receiving telescope array 1 is composed of a plurality of receiving telescopes, which are arranged in a linear array, a planar array or other forms of arrays. The receiving telescope array 1 can be arranged in a 3*3 planar array, such as Figure 2 shown.

[0019] The receiving telescope is a transmission telescope or a reflection telescope.

[0020] The multiple receiving telescopes in the receiving telescope array 1 are respectively arranged on multiple motors 2, and the multiple motors 2 are connected to the connecting rod 3. The multiple narrowband filters 4 are respectively arranged at the output ends of the multiple receiving telescopes, and the target surfaces of the multiple photodetectors 5 are respectively located at the focal plane positions of the multiple receiving telescopes. The multiple photodetectors 5 are connected to the merging circuit module 6, the merging circuit module 6 is connected to the digital-to-analog conversion module 7, the digital-to-analog conversion module 7 is connected to the demodulation module 8, and the demodulation module 8 is connected to the main control computer 9. The main control computer 9 is respectively connected to the controller 10 and the radar 11, and the controller 10 is connected to the multiple motors 2. The main control computer 9 drives the multiple motors 2 through the controller 10 to change the relative position, pitch angle and left-right angle of each receiving telescope and the connecting rod 3, so as to realize the up and down movement of each receiving telescope and the adjustment of the pitch angle and left-right angle. The change of position and pitch angle, such as Figure 3 As shown, before the movement, the two receiving telescopes are located in the middle of the connecting rod 3. After the movement, the two receiving telescopes move to the two ends of the connecting rod 3 and tilt at an angle. All directional indications such as up, down, left, and right are only used to explain a specific posture, such as Figure 3 As shown, the relative position relationship and movement conditions between the following components, if the specific posture changes, the directional indication will also change accordingly.

[0021] When working at sea, small waves will cause the communication light spot to propagate in multiple specific directions after being refracted by the waves, and the energy in each propagation direction is not evenly distributed. In order to achieve better communication effects, an adjustable multi-aperture optical communication receiving system of the present invention is used.

[0022] During operation, the radar 11 first detects and collects wave profile data, and transmits the obtained wave profile data to the main control computer 9. The main control computer 9 calculates the energy distribution at different angles after refraction in real time based on the wave profile data and the law of refraction of light, and determines the propagation angle with higher energy. The main control computer 9 then transmits the calculated data to the controller 10, which controls multiple motors 2 to adjust the relative position and angle of the receiving telescope array 1 and the connecting rod 3, so that the telescope array 1 can receive the signal light to the maximum extent and make it directly incident on the receiving system.

[0023] The receiving telescope array 1 converges the received communication beams. After filtering out stray light from other wavelengths through a narrowband filter 4, the signal light is focused onto the detection target of a photodetector 5. The photodetector 5 converts the optical signal into an electrical signal, which is then transmitted to a merging circuit module 6. This merging circuit module 6 combines multiple independent electrical signals into a single electrical signal. This electrical signal is now an analog signal, which is then converted to a digital signal by a digital-to-analog conversion module 7. The demodulation module 8 demodulates the signal and transmits it to the main control computer 9 for display, completing the information reception.

Claims

1. An adjustable multi-aperture laser communication receiving system, characterized in that: The system comprises: a receiving telescope array (1), a plurality of motors (2), a connecting rod (3), a plurality of narrowband filters (4), a plurality of photoelectric detectors (5), a merging circuit module (6), a digital-to-analog conversion module (7), a demodulation module (8), a main control computer (9), a controller (10) and a radar (11); The plurality of receiving telescopes in the receiving telescope array (1) are respectively arranged on a plurality of motors (2), the plurality of motors (2) are connected to a connecting rod (3), the plurality of narrowband filters (4) are respectively arranged at the emission ends of the plurality of receiving telescopes, and the target surfaces of the plurality of photoelectric detectors (5) are respectively located at the focal plane positions of the plurality of receiving telescopes; the plurality of photoelectric detectors (5) are connected to a merging circuit module (6), the merging circuit module (6) is connected to a digital-to-analog conversion module (7), the digital-to-analog conversion module (7) is connected to a demodulation module (8), and the demodulation module (8) is connected to a main control computer (9); the main control computer (9) is respectively connected to a controller (10) and a radar (11), and the controller (10) is connected to the plurality of motors (2); the main control computer (9) drives the plurality of motors (2) through the controller (10) to change the relative position, pitch angle, and left-right angle of each receiving telescope and the connecting rod (3), thereby realizing the up-and-down movement of each receiving telescope and the adjustment of the pitch angle and left-right angle.

2. The adjustable multi-aperture laser communication receiving system according to claim 1, characterized in that: The receiving telescope array (1) is composed of a plurality of receiving telescopes, which can be arranged in a linear array, a planar array or other array forms.

3. The adjustable multi-aperture laser communication receiving system according to claim 1, characterized in that: The receiving telescope can be a transmission telescope or a reflection telescope.

4. The adjustable multi-aperture laser communication receiving system according to claim 1, characterized in that: During operation, the radar (11) first detects and collects wave profile data, and transmits the obtained wave profile data to the main control computer (9). The main control computer (9) calculates the energy distribution at different angles after refraction in real time based on the wave profile data and the law of refraction of light, and determines the propagation angle with higher energy. The main control computer (9) then transmits the calculated data to the controller (10). The controller (10) controls the plurality of motors (2) to adjust the relative position and angle of the receiving telescope array (1) and the connecting rod (3), so that the telescope array (1) receives the signal light to the maximum extent and makes it incident on the receiving system. The receiving telescope array (1) converges the received communication light beam, filters out stray light of other bands through a narrowband filter (4), and focuses the signal light onto the detection target surface of the photodetector (5). The photodetector (5) converts the optical signal into an electrical signal, which is transmitted to a merging circuit module (6). The merging circuit module (6) merges multiple independent electrical signals into one electrical signal. The electrical signal at this time is an analog signal, which is then converted into a digital signal by a digital-to-analog conversion module (7). The demodulation module (8) demodulates the signal and transmits it to a main control computer (9) for display, thereby completing the reception of information.

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