Short wave asymmetric link building communication method, device and equipment

Abstract

The application discloses a short-wave asymmetric chain establishment communication method, device and equipment, comprising: a calling party and a called party agreeing on a synchronous or asynchronous chain establishment mode and a frequency set; the calling party sending a chain establishment request of a robust waveform; the called party receiving the chain establishment request, selecting a robust waveform or a fast waveform to send a chain establishment response according to a signal-to-noise ratio and a Doppler spread of a received signal; the calling party receiving the chain establishment response and sending data; the called party receiving the data and sending a data response; the calling party sending an interactive inquiry of a waveform consistent with the chain establishment response waveform; and the called party receiving the interactive inquiry and sending an interactive response of a waveform consistent with the interactive inquiry waveform. The asymmetric waveform chain establishment technology is used to improve the anti-interference ability of chain establishment and accelerate the chain establishment process, and the anti-interference is reflected in different preamble sequences of the robust waveform and the fast waveform. The asymmetric waveform chain establishment technology can also be applied to relay networking to enhance the anti-interference of chain establishment of the relay networking, and is compatible with a traditional chain establishment mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of communication technology, more particularly, to a short wave asymmetric link establishment communication method, device and equipment. BACKGROUND

[0002] The short wave sky wave communication window changes with the ionosphere (time), so before data transmission, the communication effect is dynamically evaluated, and the link establishment technology of automatically selecting the optimal frequency point to establish the link becomes the standard of the short wave radio station, and the performance of the link establishment (Automatic Link Establishment, ALE) approximately determines the efficiency of the short wave communication. In order to cope with the complex time-varying dispersion channel and various interferences in the sky wave transmission, domestic and foreign short wave communication experts have carried out a lot of research work on the waveform performance, anti-interference performance, and data transmission efficiency of short wave communication. In 1988, the US military released the second generation short wave automatic link establishment technology (2G-ALE) standard MIL-STD-188-141A, which well solved the demand of voice communication as the main in the 80s-90s, and the demand of low-speed data communication was not high, but the 2G-ALE used asynchronous link establishment mode of 8FSK modulation, and the required link establishment time was long, and the anti-interference ability was weak. Secondly, the signal-to-noise ratio of 2G-ALE link establishment is higher than that of low-speed data transmission waveform, which leads to the problem that in the case of low-speed data transmission, the communication cannot be carried out due to the inability to establish a link. In 1999, the US military released the third generation short wave automatic link establishment technology (3G-ALE) standard MIL-STD-188-141B, which has robust link establishment and fast link establishment two ways, and increases the synchronization mechanism, which speeds up the link establishment speed and reduces the signal-to-noise ratio requirement of link establishment. In 2017, the US military released the fourth generation short wave automatic link establishment technology (4G-ALE) standard MIL-STD-188-141D supporting wideband communication, which still uses robust link establishment and fast link establishment two ways, has synchronization and asynchronous two mechanisms, and adds the spectrum sensing technology in the variable channel and signal bandwidth on the optimal frequency.

[0003] However, in the short wave link establishment process of the prior art, the synchronous or asynchronous link establishment mode is used, and whether it is robust waveform or fast waveform link establishment, it is used in pairs in the same channel, that is, the robust waveform inquiry is responded to in the same frequency by using the robust waveform, and the fast waveform inquiry is responded to in the same frequency by using the fast waveform. Because the link establishment process lasts for a long time, the probability of being identified and intercepted is high, and the probability of being interfered is high because the two waveforms are the same. In view of the inadaptability of the synchronous / asynchronous, robust / fast pairing use mode in the short wave link establishment process in the actual use environment, an asynchronous fast link establishment mode is needed, which can support the variable channel and signal bandwidth on the optimal frequency, avoid spectrum conflict, and reduce the network establishment time, so as to realize low detection probability and improve the anti-interference effect. SUMMARY

[0004] The present application aims to overcome at least one of the defects in the prior art, and provides a short-wave asymmetric link establishment communication method, device and equipment, which are used to solve the problems of identification and compensation of low-time-delay spread channel and leakage energy, and correction of time-delay spread estimation value.

[0005] The technical method adopted by the present application is a short-wave asymmetric link establishment communication method, which comprises the following steps:

[0006] Step S100: The calling party and the called party agree on a synchronous or asynchronous link establishment mode and a frequency set;

[0007] Step S200: The calling party sends a link establishment request of a robust waveform;

[0008] Step S300: The called party receives the link establishment request, and selects a robust waveform or a fast waveform to send a link establishment response according to the signal-to-noise ratio and Doppler spread of the received signal;

[0009] Step S400: The calling party receives the link establishment response and sends data;

[0010] Step S500: The called party receives the data and sends a data response;

[0011] Step S600: The calling party sends an interactive inquiry with a waveform consistent with the link establishment response waveform;

[0012] Step S700: The called party receives the interactive inquiry and sends an interactive response with a waveform consistent with the interactive inquiry waveform.

[0013] Synchronous link establishment is that the calling party and the called party always keep the same change on a set of agreed frequencies, and asynchronous link establishment is that the calling party and the called party keep the same change on a set of agreed frequencies. The link establishment request is usually a robust waveform, because the robust waveform has better anti-interference ability than the fast waveform, so that the signal is more stable and the success rate of link establishment can be improved. According to the signal-to-noise ratio and Doppler spread of the received signal, the robust waveform or the fast waveform is autonomously selected to send the link establishment response. The use of the fast waveform response can improve the transmission rate and reduce the interaction time, and the use of the robust waveform can better resist interference and make the signal more stable when the channel environment is poor.

[0014] In the synchronization link establishment process, the frame structure of the robust waveform and the fast waveform is composed of a control level, a preamble sequence and a plurality of data segments. The duration of the robust waveform is 1100ms-1300ms, and the duration of the fast waveform is about 400ms-600ms. The control level is used to ensure the stable start of the signal, the preamble sequence is used for synchronization and channel estimation, and the plurality of data segments carry the actual communication information. The robust waveform can provide better anti-interference performance and longer communication distance due to the longer duration, and is suitable for communication scenarios requiring high reliability and stability. The fast waveform can establish a communication link faster, reduce the delay, and is suitable for communication scenarios with high real-time requirements due to the shorter duration.

[0015] In order to reasonably allocate the preamble sequence, in the asynchronous link establishment process, the frame structure of the robust waveform and the fast waveform is composed of a control level, a plurality of preamble sequences and a plurality of data segments. When the link establishment inquiry is made, the number of preamble sequences is calculated as follows:

[0016]

[0017] N represents the number of preamble sequences, T is the duration of the waveform, F is the number of frequency sets, and r is the preamble sequence. When the link establishment response is made, the number of preamble sequences is 1. This ensures that the number of preamble sequences can be reasonably and effectively allocated under different waveform durations and frequency set numbers. In the link establishment response stage, in order to simplify the communication process and improve the response speed, the number of preamble sequences is fixed to 1.

[0018] In addition to sending the robust waveform, the step S200 of sending the link establishment request also includes sending the link establishment request using the fast waveform in the case of known link communication and position information. For example, the position of the transceiver is known to be on the sea surface for ground wave communication, and the fast waveform is used for link establishment inquiry. In the case of stable link communication state and clear position information, the fast waveform can significantly reduce the time delay of the link establishment request and improve the communication efficiency.

[0019] The step S300 of autonomously selecting the robust waveform or the fast waveform to send the link establishment response according to the signal-to-noise ratio and the Doppler spread of the received signal is specifically:

[0020] (1) When the signal-to-noise ratio is greater than 3dB, the fast waveform is used for response;

[0021] (2) When the signal-to-noise ratio is less than 0dB, the robust waveform is used for response;

[0022] (3) When 0≤signal-to-noise ratio≤3dB, if the Doppler spread DS≤0.1, the fast waveform is used for response;

[0023] (4) When 0≤signal-to-noise ratio≤3dB, if the Doppler spread DS>0.1, the robust waveform is used for response.

[0024] When the signal-to-noise ratio of the received signal is higher than 3dB, it indicates that the channel condition is good, and the fast waveform is selected for the response, because the fast waveform has the characteristic of high-speed transmission, which can improve the communication efficiency; when the signal-to-noise ratio of the received signal is lower than 0dB, the channel condition is poor, and the robust waveform is selected for the response, to ensure the reliability and stability of the communication; for the medium channel condition with the signal-to-noise ratio between 0dB and 3dB, the Doppler spread is added as a selection condition, if the Doppler spread DS is less than or equal to 0.1, it indicates that the channel is relatively stable, and the system therefore selects to use the fast waveform for the response, to balance the communication efficiency and reliability; if the Doppler spread DS is greater than 0.1, it indicates that there is a large dynamic change in the channel, and the system selects to use the robust waveform for the response, to cope with the instability of the channel and ensure the successful establishment of the communication.

[0025] The step S300 sends the link establishment response, when the waveform of the link establishment response is the fast waveform, the subsequent data interaction process without disconnection all uses the fast waveform to send the inquiry and the response; when the waveform of the link establishment response is the robust waveform, the subsequent data interaction process without disconnection all uses the robust waveform to send the inquiry and the response. When the channel condition is good, the fast waveform is selected as the waveform of the link establishment response, which can quickly and accurately transmit data, and in the subsequent data interaction process without disconnection, the fast waveform is used for data interaction, to fully utilize the characteristic of high-speed transmission and improve the communication efficiency and real-time performance; if the channel condition is complex or there is interference, the more reliable robust waveform is used to ensure the integrity of the data, therefore, in the subsequent data interaction process without disconnection, the robust waveform is used for data interaction, to cope with the possible channel instability and interference and ensure the reliability and stability of the communication.

[0026] In the case that the robust waveform cannot be used for link establishment in the severe electromagnetic environment, the relay networking link establishment is also included, which includes source node link establishment and relay node link establishment, the source node link establishment is from the source node to the relay node, and the relay node link establishment is from the relay node to the destination node, and spectrum sensing is also needed before the relay node link establishment, to obtain the link establishment frequency of the relay node. Since the robust link establishment cannot be used in the source node to link with the destination node, the link establishment inquiry of the relay node uses different frequency points from the link establishment inquiry of the source node, and the fast call is used to realize the low detection probability of the signal.

[0027] The chain establishment process of the relay networking is specifically: a chain establishment request of a robust waveform is sent from a source node to a relay node, the relay node sends a chain establishment response of a fast waveform to the source node, after the source node successfully establishes a chain, a chain establishment frequency of the relay node is found through spectrum sensing, the relay node sends a chain establishment request of a fast waveform to a destination node, and the destination node sends a chain establishment response of a fast waveform to the relay node. Since the robust waveform has strong anti-interference ability and stability in a complex channel environment, the chain establishment request is sent by using the robust waveform in a case where the known channel environment is poor, so that the success rate of sending the chain establishment request to the relay node is increased. After the relay node receives the chain establishment request of the source node, the relay node immediately sends a chain establishment response of a fast waveform to the source node, the fast waveform has fast transmission speed and small time delay, so that the real-time performance of the chain establishment response is improved, and the process of the entire chain establishment process is accelerated. After the source node successfully establishes a communication link with the relay node, the relay node performs spectrum sensing, the spectrum sensing is a key link in the chain establishment process of the relay networking, is used for acquiring the use condition of a current channel in real time, and then selects an optimal chain establishment frequency, so as to avoid frequency conflict with other communication systems, and ensure the stability and safety of communication. Finally, after the relay node successfully acquires the chain establishment frequency, the relay node sends a chain establishment request of a fast waveform to the destination node. After the destination node receives the chain establishment request of the relay node, the destination node immediately sends a chain establishment response of a fast waveform to the relay node. Thus, the chain establishment process of the relay networking is completed, and stable data transmission is realized between the source node and the destination node through the relay node.

[0028] A short-wave asymmetric chain establishment communication device is constructed based on the short-wave asymmetric chain establishment communication method, and includes the following modules.

[0029] A negotiation module, in which a calling party and a called party negotiate a synchronous or asynchronous chain establishment mode and a frequency set;

[0030] A chain establishment module, in which the calling party sends a chain establishment request of a robust waveform, and the called party receives the chain establishment request, and autonomously selects a robust waveform or a fast waveform to send a chain establishment response according to a signal-to-noise ratio and a Doppler spread of a received signal;

[0031] A data transceiving module, in which the calling party receives the chain establishment response and sends data, and the called party receives the data and sends a data response;

[0032] An interaction module, in which the calling party sends an interaction inquiry of a waveform consistent with a chain establishment response waveform, and the called party receives the interaction inquiry and sends an interaction response of a waveform consistent with the interaction inquiry waveform.

[0033] A communication device includes a memory and a processor, the memory stores a computer program, and the computer program is executed by the processor to make the processor execute the steps of the short-wave asymmetric chain establishment communication method.

[0034] Compared with the prior art, the present application has the following advantages:

[0035] 1. Asymmetric waveform link establishment technology

[0036] In the use of robust waveform inquiry in synchronous / asynchronous link establishment, the called party can use robust waveform response or fast waveform response according to the received signal quality. In order to resist malicious interference, the preamble sequences of the robust waveform and the fast waveform are inconsistent, that is, the interference party cannot only use the record and play attack after detecting the link establishment inquiry of the initiator, so as to cause the link establishment response to be unable to be correctly identified;

[0037] 2. Enhanced anti-interference of relay cooperative networking

[0038] Generally, relay cooperative networking is in a harsh electromagnetic environment, that is, the source node cannot establish a link with the destination node even if the robust link establishment is used. Compared with the relay cooperative networking based on symmetric link establishment which only uses the method of changing the link establishment frequency, the asymmetric networking method of the present application enhances the anti-interference ability of the network;

[0039] 3. Compatibility with traditional link establishment method

[0040] The design of the robust waveform is the same as the preamble sequence and the encoding and decoding method of the traditional 3G ALE and 4G ALE link establishment waveform. In the receiving process, only two different length messages need to be decoded, and the waveform is judged by verifying the CRC check bit, so the traditional waveform can be directly compatible. BRIEF DESCRIPTION OF DRAWINGS

[0041] The drawings of the present application are only used for illustrative description and cannot be understood as a limitation of the present application. In order to more clearly illustrate the technical method of the embodiments of the present application, the drawings needed for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description can only be some embodiments of the present application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0042] Figure 1 The flowchart of the present application.

[0043] Figure 2 The fast waveform frame structure in the synchronous mode of the present application.

[0044] Figure 3 The robust waveform frame structure in the synchronous mode of the present application.

[0045] Figure 4 The fast response interaction schematic diagram in the synchronous mode of the present application.

[0046] Figure 5 The robust response interaction schematic diagram in the synchronous mode of the present application.

[0047] Figure 6 is the inquiry frame structure in the asynchronous mode of the application.

[0048] Figure 7 is the response frame structure in the asynchronous mode of the application.

[0049] Figure 8 is the fast response interaction schematic diagram in the asynchronous mode of the application.

[0050] Figure 9 is the robust response interaction schematic diagram in the asynchronous mode of the application.

[0051] Figure 10 is the relay cooperative networking chain building process schematic diagram of the application.

[0052] Figure 11 is the structure diagram of the short wave asymmetric chain building communication device of the application. DETAILED DESCRIPTION

[0053] The technical methods in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0054] Embodiment 1

[0055] Short wave chain building includes synchronous chain building and asynchronous chain building, and the chain building waveforms include robust waveforms and fast waveforms. In the synchronous chain building or asynchronous chain building process, the robust waveforms can be used for chain building, or the fast waveforms can be used for chain building. The synchronous chain building is that the transceiving parties always keep the same change on a set of agreed frequencies, that is, at the same time, they change to the same frequency and continue for the same time, and then change to the next frequency at the same time, which usually requires that the transceiving parties have the same time of day (TOD). The asynchronous chain building is that the transceiving parties change on a set of agreed frequencies with the same frequency change time period, and change at different starting times, that is, at different times, they change to frequencies that are not necessarily the same, but each changes to the next frequency after continuing for the same time, and it is not required that the transceiving parties have the same time of day (TOD). The synchronous chain building or the asynchronous chain building is the consistency of the transceiving parties in time, and the effect is that the synchronous chain building speed is faster than the asynchronous chain building speed, but the synchronous chain building requires that the transceiving parties have a time mechanism.

[0056] The robust waveform usually adopts a data rate of 75 bps, and the fast waveform adopts 300 bps, the condition for robust link establishment is that the signal-to-noise ratio (SNR) is about -6 dB to 0 dB, and the condition for fast link establishment is that the signal-to-noise ratio (SNR) is about 0 dB to 6 dB. Usually, the link establishment uses a message of about 50 bits, and the robust waveform is about 1 s, and the fast waveform is about 200 ms, and the waiting interval is 200 ms to 700 ms, and the estimation is 500 ms. If synchronous link establishment is used, the time of the waveform, the waiting interval and the time of the waveform are included, and the robust waveform is about 2.5 s, and the fast link establishment is about 1 s; if asynchronous link establishment is used, the time of the waveform, the waiting interval and the time of the waveform are included, and the total number of frequencies N needs to be considered, and usually, it is (N-1) * waveform time + waiting interval + waveform time.

[0057] The existing short-wave link establishment technology, whether it is a robust waveform or a fast waveform link, is used in pairs in the same channel, that is, the robust waveform is used for inquiry, and the robust waveform is used for response in the same frequency, and the fast waveform is used for inquiry, and the fast waveform is used for response in the same frequency. Because the link establishment process lasts for a long time, the probability of being identified and intercepted is high, and the two waveforms of transmission and reception are the same, and the probability of being disturbed is high. Therefore, the present application provides a short-wave asymmetric link establishment communication method, which is based on asynchronous inquiry of a robust waveform and synchronous response of a fast waveform, and supports variable channels and signal bandwidths on preferred frequencies, which can avoid spectrum conflict, reduce network establishment time, and achieve low detection probability and prompt anti-interference effect.

[0058] As shown in Figure 1 The short-wave asymmetric link establishment communication method provided by the embodiment includes:

[0059] Step S100: The calling party and the called party agree on a synchronous or asynchronous link establishment mode and a frequency set;

[0060] Step S200: The calling party sends a link establishment request of a robust waveform;

[0061] Step S300: The called party receives the link establishment request, and autonomously selects a robust waveform or a fast waveform to send a link establishment response according to the signal-to-noise ratio and the Doppler spread of the received signal;

[0062] Step S400: The calling party receives the link establishment response and sends data;

[0063] Step S500: The called party receives the data and sends a data response;

[0064] Step S600: The calling party sends an interactive inquiry with a waveform consistent with the link establishment response waveform;

[0065] Step S700: The called party receives the interactive inquiry and sends an interactive response with a waveform consistent with the interactive inquiry waveform.

[0066] In addition to using the robust waveform, the step S200 of sending the link establishment request can also use the fast waveform to establish the link. According to the link communication and the position information, the fast waveform is used to establish the link. For example, if the positions of the transceiving parties are known to be on the sea surface for the ground wave communication, the fast link establishment inquiry can be used by the transceiving parties.

[0067] In the embodiment, as shown in the following table, the robust waveform and the fast waveform both use the PSK modulation, the symbol rate is 2400, and the data section uses the spread spectrum mode.

[0068]

[0069] In the embodiment, in combination with Figures 2 to 5 As shown in the figure, in the synchronous mode, the fast waveform and the robust waveform only insert a preamble sequence between the control level and the data section, the duration of the fast waveform is about 500 ms, and the duration of the robust waveform is about 1200 ms. The robust waveform has a longer duration and has better anti-interference performance, and therefore, the calling party usually uses the robust waveform to inquire, so as to improve the success rate of sending the link establishment request. The called party selects different waveforms to respond according to the signal-to-noise ratio (SNR), and the judgment basis is as follows:

[0070] (1) When the signal-to-noise ratio is greater than 3 dB, the fast waveform is used to respond;

[0071] (2) When the signal-to-noise ratio is less than 0 dB, the robust waveform is used to respond;

[0072] (3) When 0≤signal-to-noise ratio≤3 dB, if the Doppler spread (DS)≤0.1, the fast waveform is used to respond;

[0073] (4) When 0≤signal-to-noise ratio≤3 dB, if the Doppler spread (DS) > 0.1, the robust waveform is used to respond.

[0074] If the called party responds to the link establishment using the fast waveform, the calling party and the called party both use the fast waveform to interact in the data transmission process (without disconnection); if the called party responds to the link establishment using the robust waveform, the calling party and the called party both use the robust waveform to interact in the data transmission process (without disconnection).

[0075] In the embodiment, in combination with Figures 6 to 9 As shown in the figure, in the asynchronous mode, the fast waveform and the robust waveform both insert N preamble sequences between the control level and the data section, the value of N is proportional to the number of frequency sets,

[0076]

[0077] T is the waveform time, F is the number of frequency sets, and r is the preamble sequence.

[0078] The link establishment response for both the fast waveform and the robust waveform inserts a preamble sequence between the start level and the data segment. The usage is the same as in synchronous mode: the calling party first uses the robust waveform to query, and the called party independently selects the robust waveform or fast waveform to reply based on the received signal quality. If the called party establishes the link using the fast waveform response, all interactions between the initiator and the called party during data transmission (without disconnecting the link) will use the fast waveform. If the called party establishes the link using the robust waveform response, all interactions between the initiator and the called party during data transmission (without disconnecting the link) will use the robust waveform.

[0079] In this embodiment, if Figure 10 As shown, in harsh electromagnetic environments, when even robust link establishment fails, relay networking is often used. Relay networking continues the inquiry-response method, and both link establishments can use synchronous or asynchronous methods. Regardless of whether synchronous or asynchronous link establishment is used, the two link establishments are the same as the synchronous or asynchronous link establishment methods described above. The source node link establishment is a robust waveform link establishment request sent by the source node. The relay node receives the link establishment request and sends a fast waveform link establishment response to the source node. The relay node link establishment is a fast waveform link establishment request sent by the relay node to the destination node. The destination node receives the link establishment request and sends a fast waveform link establishment response to the relay node. The relay node link establishment inquiry and the source node link establishment inquiry use different frequencies, and fast calling is used to achieve a low signal detection probability, which can improve the link establishment success rate and enhance the stability of the relay network link establishment.

[0080] Example 2

[0081] like Figure 11 As shown, this embodiment provides a shortwave asymmetric link establishment communication device, which is constructed based on the shortwave asymmetric link establishment communication method in Example 1 and includes the following modules:

[0082] Agreement module, where the calling party and the called party agree on a synchronous or asynchronous link establishment mode and frequency set;

[0083] In the link establishment module, the calling party sends a robust waveform link establishment request. The called party receives the link establishment request and, based on the signal-to-noise ratio and Doppler spread of the received signal, autonomously selects either a robust waveform or a fast waveform to send a link establishment response.

[0084] Data transceiver module: the calling party receives the link establishment response and sends data; the called party receives the data and sends a data response;

[0085] In the interaction module, the calling party sends an interaction inquiry with a waveform consistent with the link establishment response waveform; the called party receives the interaction inquiry and sends an interaction response with a waveform consistent with the interaction inquiry waveform.

[0086] Example 3

[0087] Another embodiment provided by the present application is a communication device comprising a memory and a processor, wherein the memory stores a computer program, and the computer program is executed by the processor to make the processor perform the steps of the short-wave asymmetric chain-building communication method.

[0088] The preferred embodiments of the application disclosed above are only used to illustrate the present application. The preferred embodiments do not describe all of the details of the application, and the application is not limited to the specific embodiments. Obviously, many modifications and variations can be made according to the content of the present application. The present application selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can well understand and utilize the present application. The present application is limited only by the claims and their full scope and equivalents.

Claims

1. A shortwave asymmetric link establishment communication method, characterized in that: The following steps are involved: Step S100: The calling party and the called party agree on a synchronous or asynchronous link establishment mode and frequency set; Step S200: The calling party sends a link establishment request using a robust waveform; Step S300: The called party receives the link establishment request and selects a robust waveform or a fast waveform to send a link establishment response based on the signal-to-noise ratio and Doppler spread of the received signal. Step S400: The calling party receives a link establishment response and sends data; Step S500: The called party receives the data and sends a data response; Step S600: The calling party sends an interactive inquiry with a waveform consistent with the link establishment response waveform; Step S700: The called party receives the interactive inquiry and sends an interactive response with a waveform consistent with the interactive inquiry waveform.

2. The shortwave asymmetric link establishment communication method according to claim 1, characterized in that: During the synchronous link establishment process, the frame structure of both the robust waveform and the fast waveform consists of a starting control level, a preamble sequence, and a data segment. The duration of the robust waveform is 1100ms~1300ms, and the duration of the fast waveform is approximately 400ms~600ms.

3. The shortwave asymmetric link establishment communication method according to claim 1, characterized in that: During asynchronous link establishment, the frame structure of both the robust waveform and the fast waveform consists of a starting control level, multiple preamble sequences, and a data segment. During link establishment inquiry, the number of preamble sequences is calculated as follows: N represents the number of preamble sequences, T is the duration of the waveform, F is the number of frequency sets, and r is the preamble sequence. During link establishment response, the number of preamble sequences is 1.

4. The shortwave asymmetric link establishment communication method according to claim 3, characterized in that: In step S200, when the link connectivity and location information are known, a fast waveform is used to replace the robust waveform to send a link establishment request.

5. The shortwave asymmetric link establishment communication method according to claim 4, characterized in that: In step S300, the robust waveform or the fast waveform is autonomously selected to send the link establishment response according to the signal-to-noise ratio and Doppler spread of the received signal. Specifically, (1) When the signal-to-noise ratio is greater than 3dB, use fast waveform response; (2) When the signal-to-noise ratio is less than 0 dB, use a robust waveform response; (3) When 0≤SNR≤3dB, if Doppler spread DS≤0.1, use fast waveform response; (4) When 0≤SNR≤3dB, if Doppler spread DS>0.1, use robust waveform response.

6. The shortwave asymmetric link establishment communication method according to claim 5, characterized in that: In step S300 , when the waveform of the link establishment response is a fast waveform, subsequent data interaction processes that do not disconnect the link all use the fast waveform to send inquiries and responses; when the waveform of the link establishment response is a robust waveform, subsequent data interaction processes that do not disconnect the link all use the robust waveform to send inquiries and responses.

7. The shortwave asymmetric link establishment communication method according to claim 6, characterized in that: It also includes relay network chain establishment, which includes source node chain establishment and relay node chain establishment. The source node chain establishment is to establish a chain from the source node to the relay node, and the relay node chain establishment is to establish a chain from the relay node to the destination node. Before the relay node chain is established, spectrum sensing is required to obtain the chain establishment frequency of the relay node.

8. The shortwave asymmetric link establishment communication method according to claim 7, wherein: The link establishment process of the relay network is specifically as follows: a link establishment request with a robust waveform is sent from the source node to the relay node, and the relay node sends a link establishment response with a fast waveform to the source node. After the source node successfully establishes the link, the link establishment frequency of the relay node is found through spectrum sensing. The relay node sends a link establishment request with a fast waveform to the destination node, and the destination node sends a link establishment response with a fast waveform to the relay node.

9. A shortwave asymmetric link communication device, characterized in that: Short-wave asymmetric link building based on any one of claims 1 to 8 Communication method construction, including the following modules: Agreement module, where the calling party and the called party agree on a synchronous or asynchronous link establishment mode and frequency set; In the link establishment module, the calling party sends a robust waveform link establishment request. The called party receives the link establishment request and, based on the signal-to-noise ratio and Doppler spread of the received signal, autonomously selects either a robust waveform or a fast waveform to send a link establishment response. Data transceiver module: the calling party receives the link establishment response and sends data; The called party receives data and sends a data response; In the interaction module, the calling party sends an interaction inquiry with a waveform consistent with the link establishment response waveform; the called party receives the interaction inquiry and sends an interaction response with a waveform consistent with the interaction inquiry waveform.

10. A communication device, characterized in that: The invention comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the short-wave asymmetric link establishment communication method according to any one of claims 1 to 8.

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