Distributed communication system space beam coherent synthesis method based on guidance information

Abstract

The invention discloses a spatial beam coherent synthesis method for a distributed communication system based on guidance information, relates to the technical field of communication processing, and particularly relates to a spatial beam coherent synthesis method for a distributed dynamic communication system and coherent communication. Coherent communication in static and dynamic environments is realized, so that the problem which is difficult to solve in the prior art is effectively solved, and the anti-interference capability can be further improved by encrypting broadcast signals of the guide nodes or performing multi-path transmission through a plurality of guide nodes and the like.

Description

Technical Field

[0001] This invention relates to the field of communication processing technology, and in particular to a spatial beam coherent synthesis method for a distributed communication system based on guidance information. Background Technology

[0002] To address the challenges of long-distance communication, a solution based on distributed dynamic communication systems and coherent communication has been developed. This approach aims to resolve issues such as high antenna power, poor concealment, and susceptibility to interference in long-distance wireless communication, while also reducing reliance on large antennas and high-power amplifiers.

[0003] Disadvantages of existing technology:

[0004] While this technology enables distributed coherent transmission (DCT), it demands extremely high precision in calculating and transmitting the relative positions of communication nodes. Specifically, existing technologies face three synchronization challenges in practical applications: beam synchronization, signal synchronization, and clock signal synchronization. Clock signal phase synchronization, in particular, requires knowledge of the relative positions between communication nodes with an accuracy much smaller than the wavelength. However, in most applications, existing technologies struggle to meet this requirement.

[0005] Existing technological solutions:

[0006] To solve this problem, existing technologies typically employ the following solutions:

[0007] 1. Using precise measuring equipment: This method uses high-precision measuring equipment, such as satellite navigation and positioning systems or high-precision rangefinders, to accurately measure the distance and relative position between communication nodes. The disadvantage of this method is that it requires expensive equipment and hardware, and may not be feasible or accurate in certain environments.

[0008] 2. Synchronization via communication protocols: Synchronization between communication nodes is achieved by using special communication protocols, such as Time Synchronization Protocol (TSP) or Distributed Synchronization Protocol (DSP). The disadvantage of this method is that it requires the design of complex protocols and may be affected by factors such as network latency and bandwidth limitations in practical applications. Summary of the Invention

[0009] The technical problem to be solved by this invention is to propose a new method for realizing spatial beam coherent synthesis in a distributed communication system, which addresses the shortcomings of the prior art. By introducing a guiding node and adjusting the phase of the communication node, coherent communication is realized in both static and dynamic environments, thereby effectively solving the problems that are difficult to solve by the prior art.

[0010] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0011] A spatial beam coherent synthesis method for distributed communication systems based on guidance information achieves coherent communication in both static and dynamic environments by introducing a guidance node and adjusting the phase of the communication nodes. Specifically, it includes the following:

[0012] step;

[0013] Step 1, defining the far-field condition: in the known communication direction, the relative positional relationship between communication nodes corresponds to the relative phase shift of the carrier wave;

[0014] Step 2, Introduce a guiding node: In the direction where coherent communication is required, a guiding node is placed at a location that meets the far-field conditions; the guiding node is implemented by an unmanned platform equipped with a communication module; the guiding node broadcasts a signal to the distributed communication nodes, and each communication node receives the broadcast signal from the guiding node and uses a phase detection circuit or demodulation circuit to compare it with its own local oscillator signal to determine the phase difference caused by the relative distance between the guiding node and each communication node;

[0015] When using an analog phase detector circuit, the following relationship holds:

[0016]

[0017] Where u is the output voltage of the analog phase detector circuit, k is the gain coefficient, and f is the phase detector characteristic function. The phase difference is typically determined by phase detection characteristics such as cosine, sawtooth, and delta types. The phase difference can be obtained based on the output voltage.

[0018] Step 3, Static Adjustment: In the initial state, both the communication node and the guiding node are static and their positions remain unchanged. Based on the phase difference measured in Step 2, the phase shifters of the transmitting and receiving signal branches of the communication node are adjusted to compensate for the phase difference caused by different paths. Thus, according to the principle of vector superposition, the gain is maximized when the transmitting and receiving signals of multiple communication nodes are in phase in the direction of the guiding node, thereby achieving the maximum coherent synthesis gain in the direction of the guiding node and maximizing the signal strength in the direction of the guiding node, thus ensuring distributed coherent communication in the static state.

[0019] Step 4, Dynamic Adaptation: When the communication node is in motion, the communication process works according to a certain time cycle. Each cycle is divided into two parts: guidance alignment mode and communication mode.

[0020] In the guidance alignment mode, based on the initial state, the change in phase difference is calculated based on the broadcast communication from the guidance node to the distributed communication node, and a new phase alignment is completed to ensure that the signal strength is maximized in the direction of the guidance node.

[0021] In the communication mode, the phase shifters of the distributed communication nodes are controlled according to the new phase alignment requirements to achieve dynamic coherent communication in the direction of the guiding nodes.

[0022] Step 5, Beam Scanning: Introducing a programmable UAV platform, the movement and signal transmission of the guidance node are realized through the programmable UAV platform. The guidance node can easily guide the coherent beam to point to or track the direction of communication required in space.

[0023] As a further preferred embodiment of the spatial beam coherent synthesis method for a distributed communication system based on guidance information of the present invention, in step 2, the guidance node obtains its precise location information through a satellite navigation and positioning system or other measuring equipment, and determines its relative positional relationship with other distributed communication nodes.

[0024] As a further preferred embodiment of the spatial beam coherent synthesis method for a distributed communication system based on guidance information of the present invention, after determining the relative positional relationship, the guiding node sends a signal to the distributed communication node through a broadcast signal; after receiving the signal, the distributed communication node performs phase adjustment according to the phase difference of the signal, so that each signal forms a coherent synthesis gain in the direction of the guiding node.

[0025] As a further preferred embodiment of the spatial beam coherent synthesis method for a distributed communication system based on guidance information of the present invention, in a static state, the phase shifter is adjusted by measuring the phase difference in the initial state; in a dynamic state, it is adjusted in real time by measuring the change in phase difference.

[0026] As a further preferred embodiment of the spatial beam coherent synthesis method for a distributed communication system based on guidance information of the present invention, in step 5, the movement of the guidance node and signal transmission are realized through a programmable UAV platform. The program of the UAV platform can be preset or adjusted according to real-time feedback.

[0027] Compared with the prior art, the present invention, employing the above technical solution, has the following technical effects:

[0028] This invention discloses a novel method for achieving spatial beam coherent synthesis in a distributed communication system. This method, by introducing a guiding node and adjusting the phase of the transmitted and received signals of the communication nodes, realizes distributed coherent communication in both static and dynamic environments, effectively solving problems that are difficult to address in existing technologies. Furthermore, it enhances anti-interference capabilities by encrypting the broadcast signals of the guiding node or by using multiple guiding nodes for multipath transmission. The method does not require high power from individual nodes participating in distributed coherent communication, and the signal is strongest only in the direction of the guiding node, with partial cancellation in other directions, resulting in directional spatial beams and better communication concealment. There is no fixed requirement for the number of nodes participating in distributed coherent communication, allowing for dynamic adjustment as needed. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a flowchart of the method of the present invention;

[0031] Figure 2 This is a schematic diagram of the distributed nodes of this invention. Detailed Implementation

[0032] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings:

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] This invention proposes a spatial beam coherent synthesis method for a distributed communication system based on guidance information, which specifically includes the following steps;

[0035] Step 1, defining the far-field condition: in the known communication direction, the relative positional relationship between communication nodes corresponds to the relative phase shift of the carrier wave;

[0036] Step 2, Introduce a guiding node: In the direction where coherent communication is required, a guiding node is placed at a location that meets the far-field conditions; the guiding node is implemented by an unmanned platform equipped with a communication module; the guiding node broadcasts a signal to the distributed communication nodes, and each communication node receives the broadcast signal from the guiding node and uses a phase detection circuit or demodulation circuit to compare it with its own local oscillator signal to determine the phase difference caused by the relative distance between the guiding node and each communication node;

[0037] When using an analog phase detector circuit, the following relationship holds:

[0038]

[0039] Where u is the output voltage of the analog phase detector circuit, k is the gain coefficient, and f is the phase detector characteristic function. The phase difference is typically determined by phase detection characteristics such as cosine, sawtooth, and delta types. The phase difference can be obtained based on the output voltage.

[0040] Step 3, Static Adjustment: In the initial state, both the communication node and the guiding node are static and their positions remain unchanged. Based on the phase difference measured in Step 2, the phase shifters of the transmitting and receiving signal branches of the communication node are adjusted to compensate for the phase difference caused by different paths. Thus, according to the principle of vector superposition, the gain is maximized when the transmitting and receiving signals of multiple communication nodes are in phase in the direction of the guiding node, thereby achieving the maximum coherent synthesis gain in the direction of the guiding node and maximizing the signal strength in the direction of the guiding node, thus ensuring distributed coherent communication in the static state.

[0041] Step 4, Dynamic Adaptation: When the communication node is in motion, the communication process works according to a certain time cycle. Each cycle is divided into two parts: guidance alignment mode and communication mode.

[0042] In the guidance alignment mode, based on the initial state, the change in phase difference is calculated based on the broadcast communication from the guidance node to the distributed communication node, and a new phase alignment is completed.

[0043] In the communication mode, the phase shifters of the distributed communication nodes are controlled according to the new phase alignment requirements to achieve dynamic coherent communication in the direction of the guiding node and ensure the maximum signal strength in the direction of the guiding node.

[0044] Step 5, Beam Scanning: Introducing a programmable UAV platform, the movement and signal transmission of the guidance node are realized through the programmable UAV platform. The guidance node can easily guide the coherent beam to point to or track the direction of communication required in space.

[0045] The far-field condition is defined as follows: in a known communication direction, the relative positions of communication nodes correspond to the relative phase shifts of the carrier waves. In this way, when implementing coherent beamforming, we only need to consider phase alignment in the communication direction, without needing to concern ourselves with specific locations, thus greatly simplifying the coherent operation of distributed systems.

[0046] Introducing a guide node: In the direction where coherent communication is required, a guide node can be placed at a location that meets the far-field conditions. This guide node can be implemented by an unmanned platform equipped with a communication module. The guide node broadcasts signals to the distributed communication nodes to determine the phase difference caused by the relative distance between the guide node and each communication node.

[0047] Static adjustment: In the initial state, both the communication node and the guide node are static. We adjust the phase shifter of the communication node based on the measured phase difference to achieve the maximum coherent synthesis gain in the direction of the guide node, thereby ensuring distributed coherent communication in the static state.

[0048] Dynamic Adaptation: When communication nodes are in motion, the communication process operates according to a certain time cycle. Each cycle consists of two parts: a guidance alignment mode and a communication mode. In the guidance alignment mode, based on the initial state and the broadcast communication from the guidance node to the distributed communication nodes, we calculate the change in phase difference and complete the new phase alignment. In the communication mode, we control the phase shifters of the distributed communication nodes according to the new phase alignment requirements, achieving dynamic coherent communication in the direction of the guidance node.

[0049] Beam scanning: By introducing a programmable UAV platform, the guiding node can easily guide a coherent beam in space to point to or track the direction of communication required.

[0050] In summary, this invention proposes a novel method for achieving spatial beam coherent synthesis in a distributed communication system. This method, by introducing a guiding node and adjusting the phase of the communication nodes, enables coherent communication in both static and dynamic environments, thus effectively solving problems that are difficult to address in existing technologies. Specific implementation examples:

[0052] Selection and setup of the guiding node: First, a suitable guiding node needs to be selected, which requires high-precision measuring equipment and communication capabilities. The guiding node can obtain its precise location information through a satellite navigation and positioning system or other measuring equipment, and determine its relative positional relationship with other distributed communication nodes.

[0053] Beamcoherent combining: After determining the relative positional relationship, the guiding node transmits signals to the distributed communication nodes via broadcast signals. These signals can be optical or electrical signals, depending on the application scenario. Upon receiving the signals, the distributed communication nodes adjust the phase according to the phase difference of the signals, so that the signals form a coherent combining gain in the direction of the guiding node.

[0054] Dynamic adaptation: In a static state, the phase shifter is adjusted by measuring the phase difference in the initial state; in a dynamic state, it is adjusted in real time by measuring the change in phase difference.

[0055] Program-controlled: The movement of guidance nodes and signal transmission are achieved through a programmable drone platform. The drone platform's program can be preset or adjusted based on real-time feedback.

[0056] Anti-interference capability: Because this method has low requirements for the relative position accuracy of distributed nodes, it has strong anti-interference capability. This capability can be further improved by encrypting the broadcast signals of the guiding nodes or by using multiple guiding nodes for multi-path transmission.

[0057] The spatial beam coherent combining method for distributed communication systems of the present invention can be applied to the following scenarios:

[0058] Wireless Communication Systems: This invention can be applied to wireless communication systems, such as cellular networks and wireless local area networks. By introducing a guiding node and adjusting the phase of distributed communication nodes, coherent synthesis of wireless signals in the direction of the guiding node can be achieved, increasing communication distance, improving communication quality, and enhancing anti-interference capabilities.

[0059] Satellite Communication Systems: This invention can be applied to satellite communication systems, such as satellite phones and satellite broadcasting. By introducing guiding nodes between satellites, coherent communication between satellites can be achieved, improving communication quality and stability.

[0060] Military Communication Systems: This invention can be applied to military communication systems, such as field communications and tactical communications. By introducing guiding nodes and adjusting the phase of distributed communication nodes, the concealment and anti-jamming capabilities of military communications can be achieved.

[0061] Emergency Communication System: This invention can be applied to emergency communication systems, such as disaster relief and emergency response. By introducing guiding nodes and adjusting the phase of distributed communication nodes, the ability to quickly establish an emergency communication network can be achieved.

[0062] All technical features in this embodiment can be freely combined according to actual needs.

[0063] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A spatial beam coherent combining method for a distributed communication system based on guidance information, characterized in that: By introducing a guiding node and adjusting the phase of the communication node, coherent communication in both static and dynamic environments is achieved, specifically including the following steps; Step 1, defining the far-field condition: in the known communication direction, the relative positional relationship between communication nodes corresponds to the relative phase shift of the carrier wave; Step 2, Introduce a guiding node: In the direction where coherent communication is required, a guiding node is placed at a location that meets the far-field conditions; the guiding node is implemented by an unmanned platform equipped with a communication module; the guiding node broadcasts a signal to the distributed communication nodes, and each communication node receives the broadcast signal from the guiding node and uses a phase detection circuit or demodulation circuit to compare it with its own local oscillator signal to determine the phase difference caused by the relative distance between the guiding node and each communication node; When using an analog phase detector circuit, the following relationship holds: Where u is the output voltage of the analog phase detector circuit, k is the gain coefficient, and f is the phase detector characteristic function. The phase difference is typically determined by phase detection characteristics such as cosine, sawtooth, and delta types. The phase difference can be obtained based on the output voltage. Step 3, Static Adjustment: In the initial state, both the communication node and the guiding node are static and their positions remain unchanged; Based on the phase difference measured in step 2, the phase shifters of the transmitting and receiving signal branches of the communication node are adjusted to compensate for the phase difference caused by different paths. Thus, according to the principle of vector superposition, the gain of the transmitting and receiving signals of multiple communication nodes is maximized when they are in phase in the direction of the guiding node, thereby achieving the maximum coherent synthesis gain in the direction of the guiding node and the maximum signal strength in the direction of the guiding node, thus ensuring distributed coherent communication under static conditions. Step 4, Dynamic Adaptation: When the communication node is in motion, the communication process works according to a certain time cycle. Each cycle is divided into two parts: guidance alignment mode and communication mode. In the guidance alignment mode, based on the initial state, the change in phase difference is calculated based on the broadcast communication from the guidance node to the distributed communication node, and a new phase alignment is completed to ensure that the signal strength is maximized in the direction of the guidance node. In the communication mode, the phase shifters of the distributed communication nodes are controlled according to the new phase alignment requirements to achieve dynamic coherent communication in the direction of the guiding nodes. Step 5, Beam Scanning: Introducing a programmable UAV platform, the movement and signal transmission of the guidance node are realized through the programmable UAV platform. The guidance node can easily guide the coherent beam to point to or track the direction of communication required in space.

2. The spatial beam coherent combining method for a distributed communication system based on guidance information according to claim 1, characterized in that: In step 2, the guiding node obtains its precise location information through a satellite navigation and positioning system or other measuring equipment, and determines its relative positional relationship with other distributed communication nodes.

3. The spatial beam coherent combining method for a distributed communication system based on guidance information according to claim 1, characterized in that: After determining the relative positional relationship, the guiding node sends a signal to the distributed communication node via a broadcast signal; upon receiving the signal, the distributed communication node adjusts the phase according to the phase difference of the signal, so that the signals form a coherent composite gain in the direction of the guiding node.

4. The spatial beam coherent combining method for a distributed communication system based on guidance information according to claim 1, characterized in that: In a static state, the phase shifter is adjusted by measuring the phase difference in the initial state; in a dynamic state, it is adjusted in real time by measuring the change in phase difference.

5. The spatial beam coherent combining method for a distributed communication system based on guidance information according to claim 1, characterized in that: In step 5, the movement of the guidance node and the transmission of signals are realized through a programmable drone platform. The program of the drone platform can be preset or adjusted according to real-time feedback.

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