Adjustable multi-aperture laser communication receiving system

Abstract

The adjustable multi-aperture laser communication receiving system belongs to the technical field of visible light communication, in order to solve the problems existing in the prior art, the system comprises a plurality of receiving telescopes corresponding to a plurality of motors respectively arranged in a receiving telescope array, the plurality of motors are connected to a connecting rod, a plurality of narrowband optical filters are respectively arranged at the exit ends of the plurality of receiving telescopes, and the target surfaces of a plurality of photodetectors are respectively located at the focal plane positions of the plurality of receiving telescopes; the plurality of photodetectors are connected with a merging circuit module, the merging circuit module is connected with a digital-to-analog conversion module, the digital-to-analog conversion module is connected with a demodulation module, and the demodulation module is connected with a host computer; the host computer is connected with a controller and a radar respectively, and the controller is connected with the plurality of motors; the host computer drives the plurality of motors to change the relative position, the pitch angle and the left-right angle of each receiving telescope and the connecting rod through the controller. When the laser communication across the air-sea interface is carried out, the communication performance of the receiving system is improved.

Description

Technical Field

[0001] This invention belongs to the field of visible light communication technology, specifically relating to an adjustable multi-aperture laser communication receiving system that can be used across air and sea interfaces. Background Technology

[0002] Visible light communication is a high-tech field in communications, possessing numerous advantages such as large communication capacity, high security, strong resistance to electromagnetic interference, small device size, light weight, low power consumption, and no need for radio frequency usage licenses. Since the advent of lasers, with the continuous advancement and development of optoelectronic devices, visible light communication has gradually moved from the theoretical and experimental research stage to the application stage.

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

[0004] To mitigate the impact of channel limitations on the performance of visible light communication systems, multi-aperture arrays can be used at the receiving end. Multi-aperture reception technology typically leverages the uncorrelation between channels of different apertures, providing multiple copies of the same signal to the receiving system through independent fading channels. Therefore, the probability of all copies simultaneously experiencing strong signal fading is very small. Furthermore, by combining the received signals at the receiving end in an appropriate manner, the intensity of signal fading can be reduced, and the performance of the space communication system can be improved. Utilizing multi-aperture reception technology in space optical communication systems offers many potential advantages. For example, multi-aperture reception technology has already been extensively studied and widely applied in radio frequency technology. Moreover, from an economic perspective, the production cost of multiple small-aperture receiving telescopes is far lower than that of a single large-aperture receiving telescope; from a manufacturing and assembly perspective, the production and assembly difficulty of multiple small-aperture receiving telescopes is also far less than that of a single large-aperture receiving telescope. Simultaneously, the structure of multi-aperture reception effectively reduces the possibility of temporary obstruction of laser signals by obstacles such as flocks of birds or clouds, improving the stability of the laser communication system.

[0005] Chinese patent application number "202310454872.4", entitled "Multi-aperture receiving device, space light receiver and communication system", discloses a multi-aperture receiving device including a space light receiving unit and a phase control optical path. The phase control optical path is a cascaded structure. The space light receiving unit includes multiple receiving apertures. Every M1 receiving apertures are connected to a first-level sub-phase control unit. Every M2 output ports of the first-level sub-phase control units are connected to a second-level sub-phase control unit, and so on. Every MN N-1 output ports of the sub-phase control units are connected 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, in this design, the receiving apertures cannot be moved or adjusted in angle, either as a whole or individually. When used for laser communication across the air-sea interface, its effectiveness in eliminating the influence of sea waves in the channel is limited. Summary of the Invention

[0006] In order to solve the problem that the receiving aperture cannot be moved and its angle adjusted as a whole or individually in the existing technical solutions, this invention proposes an adjustable multi-aperture laser communication receiving system.

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

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

[0009] The receiving telescope array comprises multiple receiving telescopes, each mounted on a corresponding motor, which is connected to a connecting rod. Multiple narrowband filters are positioned at the output ends of the receiving telescopes, and the target surfaces of multiple photodetectors are located at the focal planes of the telescopes. The photodetectors are connected to a merging circuit module, which in turn is connected to a digital-to-analog converter module, which is connected to a demodulation module. The demodulation module is connected to a main control computer. The main control computer is connected to a controller and a radar, and the controller is connected to the multiple motors. The main control computer drives the multiple motors via the controller to change the relative position, elevation angle, and lateral angle of each receiving telescope relative to the connecting rod, thereby enabling the vertical movement of each receiving telescope and the adjustment of its elevation and lateral angles.

[0010] During operation, the radar first detects and collects wave contour data, and transmits the obtained wave contour data to the main control computer. Based on the wave contour data and the law of light refraction, the main control computer calculates the energy distribution at different angles after refraction in real time, and determines the propagation angle with higher energy. Then, the main control computer 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 incident on the receiving system.

[0011] The receiving telescope array converges the received communication beam, filters out stray light from other bands using 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 then transmitted to the merging circuit module. The merging circuit module combines multiple independent electrical signals into one electrical signal. This electrical signal is an analog signal, which is then converted into a digital signal by a digital-to-analog converter module. The demodulated signal is then demodulated by the demodulation module and transmitted to the main control computer for display, thus completing the information reception.

[0012] The beneficial effects of this invention are as follows: The main control computer continuously adjusts the position and angle of the receiving telescope array on the connecting rod based on the sea surface height data collected by radar, thereby ensuring maximum reception of signal light and ensuring it is incident directly onto the receiving system, thus improving important communication indicators such as the signal-to-noise ratio and bit error rate of the communication system. When conducting laser communication across the air-sea interface, this invention can effectively suppress the impact of sea waves on the communication system performance, improving the communication performance of the receiving system. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of an adjustable multi-aperture optical communication receiving system according to the present invention.

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

[0015] Figure 3 This is a schematic diagram of one embodiment of the present invention: adjusting the position and angle of the receiving telescope array on the connecting rod. Detailed Implementation

[0016] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the embodiments and the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

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

[0018] The receiving telescope array 1 consists of multiple receiving telescopes, arranged in a linear array, area array, or other array configuration. The receiving telescope array 1 can be arranged in a 3x3 area array, such as... Figure 2 As shown.

[0019] The receiving telescope can be a transmission telescope or a reflection telescope, or similar structural form.

[0020] The receiving telescope array 1 comprises multiple receiving telescopes mounted on multiple motors 2, which are connected to connecting rods 3. Multiple narrowband filters 4 are respectively positioned at the output ends of the receiving telescopes. The target surfaces of multiple photodetectors 5 are located at the focal planes of the receiving telescopes. The photodetectors 5 are connected to a merging circuit module 6, which in turn is connected to a digital-to-analog converter module 7. The digital-to-analog converter module 7 is connected to a demodulation module 8, which is connected to a main control computer 9. The main control computer 9 is connected to a controller 10 and a radar 11, and the controller 10 is connected to the multiple motors 2. The main control computer 9, through the controller 10, drives the multiple motors 2 to change the relative position, elevation angle, and lateral angle of each receiving telescope and connecting rod 3, thereby achieving vertical movement of each receiving telescope and adjustment of its elevation and lateral angles. Changes in position and elevation angle, such as... Figure 3 As shown, before the movement, the two receiving telescopes were located in the middle position of connecting rod 3. After the movement, the two receiving telescopes moved towards both ends of connecting rod 3 and tilted at an angle. All directional indicators such as up, down, left, and right are only used to explain a specific orientation, such as... Figure 3 As shown, the relative positions and movements of the components are as follows. If the specific posture changes, the directional indication will also change accordingly.

[0021] When working at sea, the fine waves cause the communication light spot to propagate in multiple directions after refraction, and the energy in each propagation direction is not uniformly distributed. To obtain better communication performance, an adjustable multi-aperture optical communication receiving system according to the present invention is used.

[0022] During operation, radar 11 first detects and collects wave contour data, and transmits the obtained wave contour data to the main control computer 9. The main control computer 9 calculates the energy distribution at different angles after refraction based on the wave contour data and the law of light refraction, and determines the propagation angle with higher energy. Then, the main control computer 9 transmits the calculated data to the controller 10. The controller 10 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 receives the signal light to the maximum extent and makes it incident on the receiving system.

[0023] The receiving telescope array 1 converges the received communication beam, filters out stray light from other wavelengths using 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 then transmitted to the merging circuit module 6. The merging circuit module 6 combines multiple independent electrical signals into a single electrical signal. This electrical signal is initially an analog signal, which is then converted into a digital signal by the digital-to-analog converter module 7. The demodulated signal is then demodulated by the demodulation module 8 and transmitted 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 includes: a receiving telescope array (1), multiple motors (2), connecting rods (3), multiple narrowband filters (4), multiple photodetectors (5), a merging circuit module (6), a digital-to-analog converter module (7), a demodulation module (8), a main control computer (9), a controller (10), and a radar (11). The receiving telescope array (1) has multiple receiving telescopes respectively mounted on multiple motors (2), which are connected to a connecting rod (3). Multiple narrowband filters (4) are respectively mounted on the output ends of multiple receiving telescopes. The target surfaces of multiple photodetectors (5) are respectively located at the focal planes of multiple receiving telescopes. Multiple photodetectors (5) are connected to a merging circuit module (6), which is connected to a digital-to-analog converter module (7). The digital-to-analog converter module (7) is connected to a demodulation module (8), which is connected to a main control computer (9). The main control computer (9) is connected to a controller (10) and a radar (11), which is connected to multiple motors (2). The main control computer (9) drives multiple motors (2) through the controller (10) to change the relative position, pitch angle, and left and 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 and right angle. During operation, the radar (11) first detects and collects wave contour data and transmits the obtained wave contour 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 contour data and the law of light refraction, and determines the propagation angle with higher energy. Then, the main control computer (9) transmits the calculated data to the controller (10). The controller (10) 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 receiving 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 beam, filters out stray light from 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 then transmitted to the merging circuit module (6). The merging circuit module (6) merges multiple independent electrical signals into one electrical signal. At this time, the electrical signal is an analog signal, which is then converted into a digital signal by the digital-to-analog converter module (7). The demodulation module (8) demodulates the signal and transmits it to the main control computer (9) for display, thus completing the reception of information.

2. The adjustable multi-aperture laser communication receiving system according to claim 1, characterized in that, The receiving telescope array (1) consists of multiple receiving telescopes, which are arranged in a linear array or a surface array.

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

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