Adaptive link establishment method and system for short-wave radio stations for transmitting and receiving different frequencies

Abstract

The invention discloses a self-adaptive link establishment method and system for a short-wave radio station for transmitting and receiving different frequencies, and the method specifically comprises the steps: dividing a link establishment time slot into a call time slot, a response time slot and a confirmation time slot, and carrying out the asynchronous scanning of the short-wave radio station according to a preset frequency; then, the main calling station initiates a detection call, the called stations score uplink channels and send the scored uplink channels to the main calling station, the main calling station ranks the uplink channels according to scores, scores downlink channels and sends the scored downlink channels to the called stations, the called stations ranks the downlink channels according to scores, and a receiving party and a transmitting party respectively obtain a channel quality ranking table associated with channel numbers; finally, the calling station sets the channel with the optimal channel quality in the channel quality table of the calling station as a transmitting channel, and the called station sets the channel as a receiving channel; and the called station sets the channel with the optimal channel quality in the channel quality table of the called station as a transmitting channel, and the main calling station sets the channel as a receiving channel to finish link establishment. According to the invention, the passability and the bidirectional communication effect of the short-wave radio station are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic communications, and in particular to an adaptive link-building method and system for a shortwave radio station with different transmitting and receiving frequencies. Background Art

[0002] The current shortwave radio adaptive communication modes mainly include 2G ALE and 3G ALE. Among them, 2G ALE complies with the MIL0STD-188-141A standard. Its working principle is that the calling party repeatedly sends a call signal at a specific time, and the called party continuously scans and monitors. Once the call signal is detected, it responds. The link is automatically established through a three-way handshake of calling, answering and confirming. 3G ALE complies with the MIL0STD-188-141B standard. Its working principle is to separate the call channel and the service channel. The call channel is used in the link establishment stage, and the service channel is used for communication after the service is established.

[0003] Whether it is 2G ALE or 3G ALE, the receiving channel and transmitting channel are the same when performing business communications, that is, the receiving frequency and transmitting frequency of the radio station are the same. When the latitude difference between the transmitter and the receiver is large in the north-south direction, the low-latitude area needs to choose a lower frequency to take advantage of the reflection of the ionosphere, while the high-latitude area is more suitable for using higher-frequency electromagnetic waves, so it will be difficult to choose a channel with good two-way communication effect. If the receiving frequency and the transmitting frequency can be selected separately, the pass rate of short-wave adaptive communication will be greatly improved. Summary of the invention

[0004] The object of the present invention is to provide a method and system for adaptively establishing a link for a shortwave radio station with different transmitting and receiving frequencies, which can solve the problem of difficulty in establishing a link for an airborne shortwave radio station due to asymmetric transmitting and receiving frequencies, and improve the adaptive communication availability of the shortwave radio station.

[0005] The technical solution to achieve the purpose of the present invention is: a method for adaptively establishing a link for a shortwave radio station with different transmission and reception frequencies, comprising the following steps:

[0006] Step 1: divide the link establishment time slot into three types: call time slot, answer time slot and confirmation time slot;

[0007] Step 2: The shortwave radio station scans asynchronously according to the preset frequency;

[0008] Step 3: The calling station initiates a detection call and sends a detection call PDU in the call time slot. After receiving the detection call PDU, the called station scores the uplink channel and puts the scoring result into the response PDU frame, and sends the response PDU in the response time slot.

[0009] Step 4: After the master calling station receives the response PDU, it associates, stores, and sorts the uplink channel scores with the channel numbers, scores the downlink channels, places the scoring results in the confirmation PDU frame, and sends the confirmation PDU in the confirmation time slot;

[0010] Step 5: After the called station receives the confirmation PDU, it associates, stores, and sorts the downlink channel scores with the channel numbers;

[0011] Step 6: The master calling station switches to the next channel and repeats Steps 3 to 5 until two-way channel evaluation is completed for all preset channels, and both the transmitting and receiving parties obtain a channel quality ranking table associated with the channel numbers;

[0012] Step 7: The master calling station selects the channel ch1 with the highest channel quality ranking from the channel quality ranking table of the master calling station to send a call PDU. After the called station receives the call PDU, it sets the receiving frequency to the ch1 channel frequency, and then selects the channel frequency ch2 with the highest channel quality ranking from the channel quality ranking table of the called station and sends a response PDU in the response time slot;

[0013] Step 8: After the master calling station receives the response PDU, it sets the receiving frequency to the ch2 channel frequency, sends a confirmation PDU on the ch1 channel, enters the link establishment state, sets the receiving frequency to ch2, and sets the transmitting frequency to ch1;

[0014] Step 9: After the called station receives the confirmation PDU on the ch1 channel, it enters the link establishment state, sets the receiving frequency to ch1, and sets the transmitting frequency to ch2.

[0015] A shortwave radio adaptive link establishment system with different transmitting and receiving frequencies, which is used to implement the shortwave radio adaptive link establishment method with different transmitting and receiving frequencies. The system includes a first module to a ninth module arranged in sequence, and the functions of each module are as follows:

[0016] The first module divides the link establishment time slot into three types: call time slot, response time slot, and confirmation time slot;

[0017] The second module enables the shortwave radio to scan asynchronously according to the preset frequencies;

[0018] The third module enables the master calling station to initiate a detection call, send a detection call PDU in the call time slot. After the called station receives the detection call PDU, it scores the uplink channels, places the scoring results in the response PDU frame, and sends the response PDU in the response time slot;

[0019] The fourth module: After the master calling station receives the response PDU, it associates, stores, and sorts the uplink channel scores with the channel numbers, scores the downlink channels, places the scoring results in the confirmation PDU frame, and sends the confirmation PDU in the confirmation time slot;

[0020] The fifth module, after receiving the confirmation PDU, the called station associates, stores, and sorts the downlink channel scores with the channel numbers.

[0021] The sixth module causes the calling station to switch to the next channel and repeats the third module to the fifth module until two-way channel evaluation is completed for all preset channels, and both the transmitting and receiving parties obtain a channel quality ranking table associated with the channel numbers.

[0022] The seventh module controls the calling station to select the channel ch1 with the highest channel quality ranking from the channel quality ranking table of the calling station to send a call PDU. After the called station receives the call PDU, it sets the receiving frequency to the ch1 channel frequency, and then selects the channel frequency ch2 with the highest channel quality ranking from the channel quality ranking table of the called station and sends an answer PDU in the answer time slot.

[0023] The eighth module, after the calling station receives the answer PDU, sets the receiving frequency to the ch2 channel frequency, sends a confirmation PDU on the ch1 channel, and enters the link establishment state, setting the receiving frequency to ch2 and the transmitting frequency to ch1.

[0024] The ninth module causes the called station to enter the link establishment state after receiving the confirmation PDU on the ch1 channel, setting the receiving frequency to ch1 and the transmitting frequency to ch2.

[0025] A mobile terminal includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements the method for adaptive link establishment of a shortwave radio with different transmitting and receiving frequencies.

[0026] A computer-readable storage medium stores a computer program, and when the program is executed by a processor, it implements the steps in the method for adaptive link establishment of a shortwave radio with different transmitting and receiving frequencies.

[0027] Compared with the prior art, the significant advantages of the present invention are: (1) solving the problem of difficult link establishment caused by asymmetric transmitting and receiving frequencies of shortwave radios and improving the communication availability of shortwave radios; (2) realizing the selection of the optimal uplink and downlink frequencies for communication among preset channels of shortwave radios and improving the two-way communication effect of shortwave radios. Description of the Drawings

[0028] Figure 1 It is a flowchart showing the method for adaptive link establishment of a shortwave radio with different transmitting and receiving frequencies according to the present invention.

[0029] Figure 2 It is a structural diagram showing the division of link establishment time slots in the present invention.

[0030] Figure 3 It is a flowchart showing the process of establishing a channel quality ranking table in the present invention.

[0031] Figure 4 It is a schematic diagram of the process of link building in the present invention. DETAILED DESCRIPTION

[0032] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can imagine various implementation methods of the present invention. Therefore, the following specific implementation methods and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction of the technical solution of the present invention.

[0033] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0034] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0035] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0036] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0037] The present invention provides a method for adaptively establishing a link for a shortwave radio station with different transmission and reception frequencies, comprising the following steps:

[0038] Step 1: divide the link establishment time slot into three types: call time slot, answer time slot and confirmation time slot;

[0039] Step 2: The shortwave radio station scans asynchronously according to the preset frequency;

[0040] Step 3: The calling station initiates a detection call and sends a detection call PDU in the call time slot. After receiving the detection call PDU, the called station scores the uplink channel and puts the scoring result into the response PDU frame, and sends the response PDU in the response time slot.

[0041] Step 4: After receiving the response PDU, the calling station associates the uplink channel score with the channel number and stores them in order, scores the downlink channel, puts the scoring result into the confirmation PDU frame, and sends the confirmation PDU in the confirmation time slot;

[0042] Step 5: After receiving the confirmation PDU, the called station associates the downlink channel score with the channel number and stores them in order;

[0043] Step 6: The master calling station switches to the next channel and repeats Steps 3 to 5 until two-way channel evaluation is completed for all preset channels, and both the sending and receiving parties obtain a channel quality ranking table associated with the channel numbers respectively;

[0044] Step 7: The master calling station selects the channel ch1 with the best channel quality ranking from the channel quality ranking table of the master calling station to send a call PDU. After receiving the call PDU, the called station sets the receiving frequency to the ch1 channel frequency, and then selects the channel frequency ch2 with the best channel quality ranking from the channel quality ranking table of the called station to send an answer PDU in the answer time slot;

[0045] Step 8: After receiving the answer PDU, the master calling station sets the receiving frequency to the ch2 channel frequency, sends an acknowledgment PDU on the ch1 channel, and enters the link establishment state, setting the receiving frequency to ch2 and the transmitting frequency to ch1;

[0046] Step 9: After receiving the acknowledgment PDU on the ch1 channel, the called station enters the link establishment state, setting the receiving frequency to ch1 and the transmitting frequency to ch2.

[0047] As a specific example, in Step 1, the link establishment time slot is divided into three types: call time slot, answer time slot, and acknowledgment time slot, which are specifically as follows:

[0048] The call time slot is used for sending call PDUs;

[0049] The call answer time slot is used for sending answer PDUs;

[0050] The acknowledgment time slot is used for sending acknowledgment PDUs.

[0051] As a specific example, in Step 3, the master calling station initiates a probing call and sends a probing call PDU in the call time slot. After receiving the probing call PDU, the called station scores the uplink channel and puts the scoring result into the answer PDU frame, and sends the answer PDU in the answer time slot, which is specifically as follows:

[0052] Step 3.1: The master calling station presses the PTT key to initiate a probing call and sends a probing call PDU in the call time slot. To ensure that the called station can receive the probing call PDU, multiple probing call PDUs need to be sent, and the sending duration T C =n*T 0 where n is the number of adaptively scanned channels, and T 0 is the residence time of each channel;

[0053] Step 3.2: After receiving the probing call PDU, the called station stops scanning, scores the uplink channel, puts the scoring result into the answer PDU frame, and sends the answer PDU in the answer time slot.

[0054] As a specific example, step 5 is specifically as follows:

[0055] After the called station receives the confirmation PDU, it extracts the downlink channel score, associates and stores it with the channel number for sorting, and continues to enter the scanning state.

[0056] As a specific example, step 7 is specifically as follows:

[0057] Step 7.1: The calling station selects the channel ch1 with the best channel quality from the channel quality sorting table of the calling station, and sends a call PDU in the call time slot. To ensure that the other station can receive the call PDU, multiple call PDUs need to be sent, and the sending duration T C =n*T 0 , and enters the scanning state after the sending ends;

[0058] Step 7.2: After the called station receives the call PDU, it sets the receiving frequency to the ch1 channel frequency and stops scanning;

[0059] Step 7.2: The called station sets the sending frequency to the channel frequency ch2 with the best sorting, and sends an answer PDU in the answer time slot. To ensure that the calling station can receive the answer PDU, multiple answer PDUs need to be sent, and the sending duration T C =n*T 0 , and waits on the ch1 channel after the sending ends.

[0060] The present invention also provides a shortwave radio adaptive link establishment system with different transmitting and receiving frequencies, which is used to implement the shortwave radio adaptive link establishment method with different transmitting and receiving frequencies. The system includes a first module to a ninth module arranged in sequence, and the functions of each module are as follows:

[0061] The first module divides the link establishment time slot into three types: call time slot, answer time slot, and confirmation time slot;

[0062] The second module enables the shortwave radio to perform asynchronous scanning according to a pre-set frequency;

[0063] The third module enables the calling station to initiate a detection call, sends a detection call PDU in the call time slot, and after the called station receives the detection call PDU, it scores the uplink channel and places the scoring result in the answer PDU frame, and sends the answer PDU in the answer time slot;

[0064] The fourth module, after the calling station receives the answer PDU, associates and stores the uplink channel score with the channel number for sorting, scores the downlink channel, places the scoring result in the confirmation PDU frame, and sends the confirmation PDU in the confirmation time slot;

[0065] The fifth module, after the called station receives the confirmation PDU, associates and stores the downlink channel score with the channel number for sorting;

[0066] The sixth module switches the master calling station to the next channel, and repeats the third module to the fifth module until two-way channel evaluation is completed for all preset channels, and both the sending and receiving parties obtain a channel quality ranking table associated with the channel numbers respectively;

[0067] The seventh module controls the master calling station to select the channel ch1 with the first-ranked channel quality from the channel quality ranking table of the master calling station to send a call PDU. After the called station receives the call PDU, it sets the receiving frequency to the ch1 channel frequency, and then selects the channel frequency ch2 with the first-ranked channel quality from the channel quality ranking table of the called station, and sends an answer PDU in the answer time slot;

[0068] The eighth module, after the master calling station receives the answer PDU, sets the receiving frequency to the ch2 channel frequency, sends an acknowledgment PDU on the ch1 channel, and enters the link establishment state, sets the receiving frequency to ch2, and the sending frequency to ch1;

[0069] The ninth module enables the called station to enter the link establishment state after receiving the acknowledgment PDU on the ch1 channel, sets the receiving frequency to ch1, and the sending frequency to ch2.

[0070] The present invention also provides a mobile terminal, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the short-wave radio station adaptive link establishment method with different transmitting and receiving frequencies is implemented.

[0071] The present invention also provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the steps in the short-wave radio station adaptive link establishment method with different transmitting and receiving frequencies are implemented.

[0072] The following combines the drawings and specific embodiments to further elaborate on the present invention in detail.

[0073] Embodiment

[0074] As Figure 1 shown, a short-wave radio station adaptive link establishment method with different transmitting and receiving frequencies according to the present invention includes the following steps:

[0075] Step 1: Divide the link establishment time slot into three types: call time slot, answer time slot, and acknowledgment time slot. As Figure 2 shown, specifically as follows:

[0076] The call time slot is used for sending a call PDU; the call answer time slot is used for sending an answer PDU; the acknowledgment time slot is used for sending an acknowledgment PDU.

[0077] Step 2: The short-wave radio station scans asynchronously according to the preset frequencies;

[0078] Step 3. The master call station initiates a detection call. As Figure 3 shown, the master call station sends a LE_SOUND detection call PDU in the call time slot S1. After receiving the LE_SOUND detection call PDU, the called station scores the uplink channel and places the scoring result in the response PDU frame, and sends a LE_HSK response PDU in the response time slot S2. Specifically as follows:

[0079] Step 3.1. The master call station presses the PTT key to initiate a detection call and sends a LE_SOUND detection call PDU in the call time slot S1. To ensure that the called station can receive the detection call PDU, multiple detection call PDUs need to be sent, and the transmission duration T C =n*T 0 , where n is the number of adaptively scanned channels, and T 0 is the residence time of each channel;

[0080] Step 3.2. After receiving the LE_SOUND detection call PDU, the called station stops scanning, scores the uplink channel, places the scoring result in the response PDU frame, and sends a LE_HSK response PDU in the response time slot S2.

[0081] Step 4. After receiving the response PDU, the master call station associates, stores, and sorts the uplink channel scores with the channel numbers, scores the downlink channel, places the scoring result in the confirmation PDU frame, and sends a confirmation PDU in the confirmation time slot. Specifically as follows:

[0082] After receiving the LE_HSK response PDU, the master call station extracts the uplink channel scores, associates, stores, and sorts them with the channel numbers, scores the downlink channel, places the scoring result in the confirmation PDU frame, and sends a LE_ACK confirmation PDU in the confirmation time slot S3.

[0083] Step 5. After receiving the LE_ACK confirmation PDU, the called station extracts the downlink channel scores, associates, stores, and sorts them with the channel numbers, and continues to enter the scanning state.

[0084] Step 6. The master call station switches to the next channel and repeats Steps 3 to 5 until two-way channel evaluation is completed for all preset channels, and both the sending and receiving parties obtain a channel quality ranking table associated with the channel numbers;

[0085] Step 7. The master call station selects the channel ch1 with the highest channel quality ranking from the channel quality ranking table of the master call station to send a call PDU. After receiving the call PDU, the called station sets the receiving frequency to the ch1 channel frequency, and then selects the channel frequency ch2 with the highest channel quality ranking from the channel quality ranking table of the called station, and sends a response PDU in the response time slot. As Figure 4 shown, specifically as follows:

[0086] Step 7.1: The calling station selects the channel ch1 with the highest channel quality ranking from the channel quality ranking table of the calling station, and sends a LE_CALL call PDU in the call time slot S1. To ensure that the called station can receive the call PDU, multiple call PDUs need to be sent, and the sending duration T C =n*T 0 , and enters the scanning state after the sending ends;

[0087] Step 7.2: After receiving the LE_CALL call PDU, the called station sets the receiving frequency to the channel frequency of ch1 and stops scanning;

[0088] Step 7.2: The called station sets the sending frequency to the channel frequency ch2 with the highest ranking, and sends a LE_HSK response PDU in the response time slot S2. To ensure that the calling station can receive the response PDU, multiple response PDUs need to be sent, and the sending duration T C =n*T 0 , and waits on the ch1 channel after the sending ends.

[0089] Step 8: After receiving the LE_HSK response PDU, the calling station sets the receiving frequency to the channel frequency of ch2, sends a LE_ACK confirmation PDU on the ch1 channel, and enters the link establishment state, setting the receiving frequency to ch2 and the sending frequency to ch1;

[0090] Step 9: After receiving the LE_ACK confirmation PDU on the ch1 channel, the called station enters the link establishment state, setting the receiving frequency to ch1 and the sending frequency to ch2.

[0091] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A method for adaptively establishing a link between shortwave radio stations with different transmission and reception frequencies, characterized in that: The following steps are involved: Step 1: divide the link establishment time slot into three types: call time slot, answer time slot and confirmation time slot; Step 2: The shortwave radio station scans asynchronously according to the preset frequency; Step 3: The calling station initiates a detection call and sends a detection call PDU in the call time slot. After receiving the detection call PDU, the called station scores the uplink channel and puts the scoring result into the response PDU frame, and sends the response PDU in the response time slot. Step 4: After receiving the response PDU, the calling station associates the uplink channel score with the channel number and stores them in order, scores the downlink channel, puts the scoring result into the confirmation PDU frame, and sends the confirmation PDU in the confirmation time slot; Step 5: After receiving the confirmation PDU, the called station associates the downlink channel score with the channel number and stores them in order; Step 6: The calling station switches to the next channel and repeats steps 3 to 5 until all preset channels have completed the two-way channel evaluation. The sender and receiver each obtain a channel quality ranking table associated with the channel number. Step 7, the calling station selects the channel ch1 ranked first in channel quality ranking from the channel quality ranking table of the calling station to send a call PDU. After receiving the call PDU, the called station sets the receiving frequency to the channel frequency of ch1, and then selects the channel frequency ch2 ranked first in channel quality ranking from the channel quality ranking table of the called station, and sends a response PDU in the response time slot; Step 8: After receiving the response PDU, the calling station sets the receiving frequency to the ch2 channel frequency, sends the confirmation PDU on the ch1 channel, and enters the link establishment state, setting the receiving frequency to ch2 and the sending frequency to ch1; Step 9: After the called station receives the confirmation PDU on channel ch1, it enters the link establishment state, sets the receiving frequency to ch1, and sets the transmitting frequency to ch2.

2. The method for adaptively establishing a link for a shortwave radio station with different transmission and reception frequencies according to claim 1, characterized in that: In step 1, the link establishment time slot is divided into three types: call time slot, answer time slot and confirmation time slot, as follows: The calling time slot is used for sending calling PDU; The call answering time slot is used for sending the answering PDU; The confirmation time slot is used to confirm the sending of the PDU.

3. The method for adaptively establishing a link for a shortwave radio station with different transmission and reception frequencies according to claim 1, characterized in that: In step 3, the calling station initiates a detection call and sends a detection call PDU in the call time slot. After receiving the detection call PDU, the called station scores the uplink channel and puts the scoring result into the response PDU frame, and sends the response PDU in the response time slot, as follows: Step 3.1: The calling station presses the PTT key to initiate a detection call and sends a detection call PDU in the call time slot. In order to ensure that the called station can receive the detection call PDU, it is necessary to send multiple detection call PDUs. The sending time is T. C =n*T0, where n is the number of adaptive scanning channels and T0 is the dwell time of each channel; Step 3.2: After receiving the detection call PDU, the called station stops scanning, scores the uplink channel, puts the scoring result into the response PDU frame, and sends the response PDU in the response time slot.

4. The method for adaptively establishing a link for a shortwave radio station with different transmission and reception frequencies according to claim 1, characterized in that: Step 5 is as follows: After receiving the confirmation PDU, the called station takes out the downlink channel score, associates it with the channel number, stores it in order, and continues to enter the scanning state.

5. The method for adaptively establishing a link for a shortwave radio station with different transmission and reception frequencies according to claim 1, characterized in that: Step 7 is as follows: Step 7.1: The calling station selects the channel ch1 ranked first in channel quality ranking from the channel quality ranking table of the calling station, and sends a call PDU in the calling time slot. In order to ensure that the other station can receive the call PDU, it needs to send multiple call PDUs, and the sending time is T. C =n*T0, enter scanning state after sending; Step 7.2: After receiving the calling PDU, the called station sets the receiving frequency to the ch1 channel frequency and stops scanning; Step 7.2: The called station sets the transmission frequency to the first channel frequency ch2, and sends the response PDU in the response time slot. In order to ensure that the calling station can receive the response PDU, it needs to send multiple response PDUs, and the sending time is T. C =n*T0, wait on channel ch1 after sending.

6. An adaptive link establishment system for shortwave radio stations with different transmission and reception frequencies, characterized in that: The system is used to implement the adaptive link establishment method for shortwave radio stations with different transmission and reception frequencies as described in any one of claims 1 to 5. The system includes a first module to a ninth module arranged in sequence, and the functions of each module are as follows: The first module divides the link establishment time slot into three types: call time slot, answer time slot and confirmation time slot; The second module enables the shortwave radio station to scan asynchronously according to the pre-set frequency; The third module enables the calling station to initiate a detection call and send a detection call PDU in the calling time slot. After receiving the detection call PDU, the called station scores the uplink channel and puts the scoring result into the response PDU frame and sends the response PDU in the response time slot. In the fourth module, after receiving the response PDU, the calling station associates the uplink channel score with the channel number and stores them in order, scores the downlink channel, puts the scoring result into the confirmation PDU frame, and sends the confirmation PDU in the confirmation time slot; The fifth module, after the called station receives the confirmation PDU, associates the downlink channel score with the channel number and stores them in order; The sixth module switches the main calling station to the next channel, and repeats the third to fifth modules until all preset channels have completed the two-way channel evaluation, and the sender and receiver each obtain a channel quality ranking table associated with the channel number; The seventh module controls the calling station to select the channel ch1 ranked first in channel quality ranking from the channel quality ranking table of the calling station to send a call PDU. After the called station receives the call PDU, it sets the receiving frequency to the channel frequency of ch1, and then selects the channel frequency ch2 ranked first in channel quality ranking from the channel quality ranking table of the called station, and sends a response PDU in the response time slot; In the eighth module, after receiving the response PDU, the calling station sets the receiving frequency to the ch2 channel frequency, sends the confirmation PDU on the ch1 channel, and enters the link establishment state, setting the receiving frequency to ch2 and the sending frequency to ch1; The ninth module enables the called station to enter the link establishment state after receiving the confirmation PDU on the ch1 channel, and the receiving frequency is set to ch1 and the sending frequency is set to ch2.

7. A mobile terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the method for adaptively establishing a link between shortwave radio stations that transmit and receive different frequencies as described in any one of claims 1 to 5 is implemented.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by the processor, the steps in the method for adaptively establishing a link between shortwave radio stations that transmit and receive different frequencies as described in any one of claims 1 to 5 are implemented.

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