Method for improving communication stability of radio station in complex environment and communication equipment

Abstract

The invention discloses a method for improving communication stability of a radio station in a complex environment and communication equipment, relates to the technical field of wireless communication, and aims to solve the problems of high probability of data loss, weak anti-interference capability and unstable communication quality in the complex environment in the prior art. And traversing the frequency hopping library to send a link establishment message to the receiving radio station, evaluating an optimal frequency point by the receiving radio station according to the communication quality of all the frequency points, establishing an optimal frequency library, and establishing link synchronization with the issuing radio station through high-quality frequency points in the optimal frequency library. The current optimal frequency point is established every time link synchronization is established, so that the communication stability can be remarkably improved, the data loss is greatly reduced, and the anti-interference capability is improved.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, specifically to a method and communication device for improving the stability of radio communication in complex environments. Background Technology

[0002] Currently, the commonly used narrowband waveform has a channel bandwidth of 70kHz and a modulation bandwidth of 32kHz. The bandwidth is relatively narrow. When a momentary strong interference occurs and overwhelms the signal, it will lead to the loss or error of the whole hop data. When continuous strong interference and background noise overwhelm the signal, it will lead to multi-hop data demodulation errors and exceed the RS error correction capability, ultimately resulting in data loss.

[0003] Meanwhile, narrowband waveforms have limited symbol rates, resulting in fewer feasible anti-interference algorithms. The main anti-interference methods are multi-hop interleaving and redundant design of error correction arrays. When the noise interference component is greater than the signal energy, single-hop interference will inevitably lead to demodulation errors. When continuous and strong noise interference occurs throughout the entire frequency band, frequency hopping interleaving technology can no longer be used to resist hop error interference. In this environment, the available communication frequencies are limited and unstable. A communication technology is needed that can select high-quality communication frequencies during interference gaps or in low-interference areas, while also having real-time channel quality monitoring capabilities and the ability to switch communication frequencies according to noise changes to maintain communication stability.

[0004] See Figure 1 This demonstrates the standard radio link establishment process. This is currently the most common implementation method used for radio synchronization. It typically has only two layers: link establishment request and link synchronization. After the master station sends the link establishment request, it enters a response search state, waiting for a response from the called party. Link synchronization involves the master station analyzing the frequencies of both the master and slave stations and sending the results to the slave station. Upon receiving the master station's frequencies, the slave station will respond three times consecutively on the available frequencies to confirm entry into synchronization mode.

[0005] In practical applications, the above-mentioned existing technologies have been found to have the following technical problems:

[0006] 1. The existing narrowband waveform has a channel bandwidth of 70kHz and a modulation bandwidth of 32kHz. The bandwidth is relatively narrow. When a momentary strong interference occurs and overwhelms the signal, it will cause the loss or error of the whole hop data. When continuous strong interference and background noise overwhelm the signal, it will cause multi-hop data demodulation errors and exceed the RS error correction capability, ultimately leading to data loss.

[0007] 2. Existing narrowband waveforms have limited symbol rates, resulting in a limited number of feasible anti-interference algorithms. The main anti-interference methods are multi-hop interleaving and redundant design of error correction arrays. When the noise interference component is greater than the signal energy, demodulation errors will inevitably occur with single hop. When continuous and strong noise interference occurs throughout the entire frequency band, frequency hopping interleaving technology can no longer be used to resist hop error interference. In this environment, the available communication frequencies are limited and unstable.

[0008] Chinese patent CN112994739B discloses an autonomous link establishment and frequency conversion integrated communication method and system without a common control channel. The technical solution adopted is that the calling party communication node monitors the working frequency point through a real-time interference detection mechanism and autonomously updates the transmission signal characteristic parameters of the calling party communication node at certain frequency conversion time slots, or autonomously updates the transmission signal characteristic parameters of the calling party communication node when interference is detected, so that the responding party communication node updates the transmission signal characteristic parameters in the responding party communication node after receiving the updated transmission signal characteristic parameters.

[0009] The existing patent involves detecting interference after the link is established and updating parameters periodically or when interference is detected. However, it lacks verification of the communication quality of the updated frequency. If the updated frequency is still subject to interference, the frequency point needs to be switched again, resulting in a longer synchronization time and a decrease in communication quality. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to overcome the existing defects and provide a method and communication device for improving the stability of radio communication in complex environments, which can effectively solve the problems in the background art.

[0011] To achieve the above objectives, this invention first discloses a method for improving the stability of radio communication in complex environments. The technical solution adopted includes the following steps:

[0012] Step 1: After activating the radio adaptive frequency selection function, the transmitting radio uses a pseudo-random frequency hopping frame structure to periodically and cyclically send link establishment requests based on the frequency points in the frequency hopping library, and waits for the receiving radio to respond. Using a pseudo-random frequency hopping frame structure to periodically and cyclically send link establishment requests can increase the probability of finding available communication frequencies in complex environments.

[0013] Step 2: The receiving radio retrieves the self-selected frequency synchronization frame data; upon receiving the self-selected frequency frame data, if the link establishment target is the local station, it enters self-selected frequency synchronization and obtains the hopping timing and hopping random parameters; after receiving any response information, the transmitting radio's master station switches to the synchronization frequency sweep mode at the end of the search time slot; when the transmitting radio's subordinate stations receive the master station's search and link establishment messages, they will all switch to the synchronization frequency sweep mode; in the synchronization frequency sweep mode, all frequency points in the frequency hopping library are traversed, and the best frequency point is selected to establish the preferred frequency library;

[0014] Step 3: The receiving radio selects a frequency point from the preferred frequency library as the communication frequency point, synchronizes the link with the transmitting radio, and exchanges services and information.

[0015] Step 4: After the transmitter and receiver radios are synchronized, both parties exchange verification messages according to the self-selected frequency interaction timing, record and exchange the bit error rate of both the transmitter and receiver, and after three cycles, output the high-quality frequency and bit error rate to the panel and terminal software.

[0016] By entering the synchronous frequency sweep mode to sweep and test all frequency points, and updating the high-quality frequency points found in the test to the preferred frequency library in a timely manner, the effectiveness of the selected high-quality frequency points in the preferred frequency library can be guaranteed.

[0017] By updating the frequency points in the preferred frequency library through synchronous frequency sweeping mode, and then using the high-quality frequency points in the preferred frequency library as communication frequency points, the radio can obtain a relatively stable communication quality.

[0018] As a preferred technical solution of the present invention, in step 1, when the transmitting radio station sends a link establishment request, the transmitting radio station selects 14 frequency points from the frequency points in the frequency hopping table, divides them into 2 groups, each group contains 7 frequency points, each frequency point 2 hops, and sends them 8 times in a loop.

[0019] In a preferred embodiment of the present invention, each of the seven frequency points in each group contains complete synchronization and request commands. This allows each frequency point to complete a full communication cycle, thereby enabling the verification of the communication quality of that frequency point.

[0020] As a preferred technical solution of the present invention, in step 2, after both the master station and the subordinate station enter the synchronous frequency scanning mode, at least one round of cyclical sending of search messages between the master and subordinate stations will be performed. Each operation includes 7 frequency points, and each frequency point is repeated 7 times. The receiving station will detect the signal quality of the received frequency points in real time and feed the information back to the other party in the next round of search. After traversing all the frequency points in the frequency hopping table, the master station of the receiving station selects 7 high-quality frequency points to establish a preferred frequency library and sends it to the subordinate station. After receiving the preferred frequency points from the master station, the subordinate station will respond three times consecutively on the passable frequency points to confirm that it has entered the synchronous mode before proceeding to step 3.

[0021] As a preferred embodiment of the present invention, the mechanism for selecting high-quality frequency points employs a comprehensive quality assessment method based on three factors: signal-to-noise ratio, bit error rate, and frame error rate. This comprehensive assessment approach allows for a more complete evaluation of the current communication environment.

[0022] As a preferred technical solution of the present invention, frequency points that simultaneously meet the requirements of signal-to-noise ratio not less than 6, bit error rate not greater than 1%, and frame error rate not greater than 5% are judged as high-quality frequency points.

[0023] As a preferred technical solution of the present invention, the frequency points in the preferred frequency library are divided into primary frequency points and backup frequency points according to quality, and a primary and backup frequency table is established. The primary frequency point is selected as the communication frequency point for service and information interaction. The interaction data includes two data structures: service frames and maintenance frames.

[0024] As a preferred technical solution of the present invention, the service frame includes a synchronization jump, a main frequency verification jump, a service jump, and an exit jump; wherein, the synchronization jump includes 4 frequency points, and each jump includes synchronization, TOD, service / maintenance label, and main frequency change information.

[0025] As a preferred technical solution of the present invention, the maintenance frame is sent when the service is idle or during a preset period, and is used to detect the frequency quality of the preferred frequency library and the frequency hopping library in order to maintain the health of the primary and backup frequency tables; the maintenance frame includes synchronization hopping, primary frequency verification hopping, backup frequency monitoring hopping, and frequency hopping detection hopping.

[0026] This invention also discloses a communication system, the technical solution of which includes a transmitting radio and a receiving radio. The transmitting radio includes a transmitting master station and a transmitting slave station. The transmitting master station includes a first memory, a first transceiver, and a first processor, which are electrically connected. The transmitting slave station includes a second memory, a second transceiver, and a second processor, which are electrically connected. The receiving radio includes a receiving master station and a receiving slave station. The receiving master station includes a third memory, a third transceiver, and a third processor, which are electrically connected. The receiving slave station includes a fourth memory, a fourth transceiver, and a fourth processor, which are electrically connected. Its characteristic is:

[0027] The first memory is used to store computer programs, frequency hopping libraries, and preferred frequency libraries;

[0028] The first transceiver is used to send and receive data under the control of the first processor;

[0029] The first processor runs the computer program stored in the first memory, obtains a random frequency point from the frequency hopping library in the first memory using a pseudo-random algorithm, and sends a link establishment message to the receiving station through the selected frequency point and the first transceiver according to the time slot table. The message contains synchronization, TOD, service / maintenance label, and master frequency change information. After sending, the first transceiver searches for response messages. Upon receiving any response message, when the time slot search ends, it switches to the synchronization frequency sweep mode. In the synchronization frequency sweep mode, the first processor sends a link establishment message to the transmitting station through the first transceiver. The link establishment message is sent periodically and cyclically, and the cyclical frequency points are the preferred frequency library and frequency hopping library randomly obtained through the pseudo-random algorithm. The frequency points in the frequency range are determined as follows: After sending the link establishment message, the first transceiver switches to receiving mode. After receiving the sender's reply message from the second transceiver, it sends the sender's reply message as a sender message to the third transceiver according to the frequency point of the sender's reply message. Then, the first transceiver switches to receiving mode. After receiving the receiver's reply message from the third transceiver, it retains the frequency point of the receiver's reply message in the preferred frequency library. After traversing the frequency points in the preferred frequency library, it traverses the frequency points in the frequency hopping library that are not included in the preferred frequency library again, and updates the preferred frequency library with the tested high-quality frequency points. During the update, all frequency points in the preferred frequency library are deleted, and the tested high-quality frequency points are stored in the preferred frequency library.

[0030] The second memory is used to store computer programs;

[0031] The second transceiver is used to send and receive data under the control of the second processor.

[0032] The second processor runs the computer program stored in the second memory. When it receives the search and link establishment message from the transmitting master station through the second transceiver, it switches to the synchronous frequency sweep mode. In the synchronous frequency sweep mode, the second processor sends the transmitting station maintenance reply message to the transmitting radio master station one by one according to the frequency points sent by the first processor.

[0033] The third memory is used to store computer programs, evaluation results of frequency communication quality, and a preferred frequency library;

[0034] The third transceiver is used to send and receive data under the control of the third processor;

[0035] The third processor runs the computer program stored in the third memory. After receiving the link establishment message from the first transceiver via the third transceiver, it obtains the hop timing and hop random parameters, corrects its own TOD information based on the TOD information in the link establishment message, and obtains the frequency point information. It evaluates the signal-to-noise ratio, bit error rate, and frame error rate of the received signal. If the signal-to-noise ratio is not less than 6, the bit error rate is not greater than 1%, and the frame error rate is not greater than 5% simultaneously, the frequency point is determined to be a high-quality frequency point; otherwise, it is determined to be a general frequency point. The evaluation results are stored in the third memory. After evaluating all frequency points, the best frequency points are established into a preferred frequency library. The frequency points in the preferred frequency library are sent to the fourth transceiver of the receiving master station via the third transceiver. The receiving response message is sent to the first transceiver of the transmitting master station via the high-quality frequency points in the preferred frequency library. The structure of the receiving response message is the same as the timing structure of the transmitting master station search. The third transceiver is switched to receiving mode. After receiving the receiving master station response message sent by the fourth transceiver, link synchronization is performed.

[0036] The fourth memory is used to store computer programs;

[0037] The fourth transceiver is used to send and receive data under the control of the fourth processor;

[0038] The fourth processor runs the computer program stored in the fourth memory. When it receives a link establishment message from the receiving master station via the fourth transceiver, it sends a response message from the receiving subordinate station using the frequency information contained in the link establishment message. Compared with the prior art, the beneficial effects of this invention are: This invention, by having the master and subordinate stations of the transmitting station enter a synchronous frequency sweep mode at the end of the search time slot, sends maintenance frames to the receiving station one by one through all the frequency points in the frequency hopping library to check the communication quality, and establishes a high-quality frequency library based on the evaluated best frequency points. When the transmitting and receiving stations establish a service link, they directly establish the link through the high-quality frequency points in the high-quality frequency library. Even if the master frequency point is interfered with during communication, it can quickly access through the backup frequency points in the preferred frequency library, thereby ensuring the normal communication status and significantly improving the stability of communication. The optimal frequency point is updated every time a link is established, which can significantly improve the anti-interference capability.

[0039] Furthermore, by comprehensively judging communication quality through three indicators—signal-to-noise ratio, bit error rate, and frame error rate—it is possible to fully assess the current communication environment, significantly reduce the possibility of data loss, and further enhance anti-interference capabilities. Attached Figure Description

[0040] Figure 1 The existing radio link establishment process;

[0041] Figure 2 This is a flowchart of the chain building process of this invention;

[0042] Figure 3This is a timing structure diagram of the chain establishment request sending in this invention;

[0043] Figure 4 This is a sequence diagram of the chain search structure for this invention;

[0044] Figure 5 This is a timing diagram of the synchronous frequency sweep structure of the present invention;

[0045] Figure 6 This is a timing structure diagram of the service frame of the present invention;

[0046] Figure 7 This is a timing structure diagram for the periodic maintenance of this invention;

[0047] Figure 8 This is a diagram showing the relationship between the transmission frequency calculation of this invention. Detailed Implementation

[0048] 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.

[0049] Example 1

[0050] like Figures 2 to 8 As shown, this invention discloses a method for improving the stability of radio communication in complex environments. The technical solution adopted includes the following steps:

[0051] Step 1: Power on the radio.

[0052] Step 2: Activate the radio station's adaptive frequency selection function, enter the preset period, and begin the link establishment request:

[0053] The transmitting radio station uses a pseudo-random frequency hopping frame structure based on the frequency points in the frequency hopping library to periodically and cyclically send link establishment requests to the receiving radio station and wait for the receiving radio station's response.

[0054] Among them, the pseudo-random frequency hopping frame structure is as follows: Figure 8 As shown, it is related to the channel number, table network number, key number, and TOD time, and has time-varying characteristics, varying with time; the calculation formula adopts a pseudo-random algorithm, which has good randomness and probability uniformity, and has good anti-detection capabilities;

[0055] The pseudo-random algorithm is a linear congruential method, and the recurrence relation is as follows:

[0056]

[0057] in It is the first A random number (seed value or a previously generated random number); It is a multiplier ( ); It is an increment ( ); It is the modulus ( );

[0058] The modulo operation guarantees that the generated random numbers are accurate. Within the range, if you want to get Random numbers in an interval can Divide by ,Right now ;

[0059] The synchronization timing of the link establishment request frame and the search frame will select 7 frequencies from the frequency hopping library to achieve the purpose of fast traversal of the frequency table; the synchronization header of the service frame and the maintenance frame will select 4 frequency points from the primary and backup frequency tables to improve the synchronization probability.

[0060] The connection establishment request sending sequence is as follows: Figure 3 As shown, 14 frequency points are selected from the preferred frequency library and divided into 2 groups; each group has 7 frequency points, each frequency point has 2 hops, and the transmission is carried out 8 times in a loop;

[0061] After the radio host completes the transmission, it enters the response search state, waiting for the response from the called party. The link search sequence is as follows: Figure 4 As shown, each time 7 frequency points are detected, each frequency point is detected 8 times consecutively, and each time occupies 2 hops; when the transmitting host receives the response instruction from the receiving radio, it sends a receive response and enters the frequency sweep timing; if no response is received from the called party, the link establishment request is resent until a response is received from the called radio.

[0062] Step 3: The receiving radio simultaneously searches for normal synchronization frames and auto-selective synchronization frames. Upon receiving an auto-selective frame, if the link establishment target is the local station, it enters auto-selective synchronization and acquires timing jump and random jump parameters. Based on the timing information of the transmitting master station contained in the received auto-selective frame, it adjusts its own TOD (Time of Day) information to synchronize the receiving master station time with the transmitting master station time, and continuously sends responses to the transmitting master station. The response message structure is the same as the link establishment search timing structure of the transmitting radio. If no auto-selective synchronization frame data is found, it enters normal synchronization state through the found normal synchronization frame.

[0063] Step 4: After receiving any response information, the transmitting master station completes the link establishment between the transmitting master station and the receiving master station. The transmitting master station sends search and link establishment messages to the transmitting subordinate station. After the current search time slot ends, the transmitting master station enters the synchronous frequency scanning mode. After receiving the search and link establishment messages sent by the transmitting master station, the transmitting subordinate station enters the synchronous frequency scanning mode.

[0064] Step 5, in synchronous frequency scanning mode, the structure of the search message sent cyclically by the transmitting master station and the transmitting subordinate stations is as follows: Figure 5 As shown, each cycle contains 7 frequency points, and each frequency point is repeated 7 times. The transmitting and receiving parties traverse the frequency points in the frequency hopping table according to the time-varying pseudo-random algorithm.

[0065] Step 6: The receiving radio station will detect the signal quality of the received frequency in real time and feed the information back to the transmitting radio station in the next search sequence. The receiving master station records and analyzes the frequency quality of both the master and slave stations of the transmitting radio station, selects 7 high-quality frequencies to establish a preferred frequency library, and sends it to the receiving slave station.

[0066] Due to the narrow bandwidth and limited data resources of narrowband waveforms, the accuracy of frequency point quality assessment is relatively low. Therefore, a comprehensive quality assessment method is adopted, using three metrics: signal-to-noise ratio (SNR), bit error rate (BER), and frame error rate (FR). SNR detection is performed in the synchronization header to determine the ratio of received energy to noise interference components. BER is performed in the check and monitoring frames to determine the bit error rate of the demodulated data. FR is performed in the service and maintenance frames to determine the recovery capability of the demodulated data after error correction. The combined use of these three quality detection methods can effectively determine the interference components and proportions of single-peak and suppressed noise in the entire frame data, and measure the data transmission success rate.

[0067] Signal-to-noise ratio formula:

[0068]

[0069] in, Represents the effective value of the signal. Represents the effective value of the noise;

[0070] Note: The higher the received signal-to-noise ratio, the better the signal quality; signals close to the noise floor may be overwhelmed by noise, making the received signal unresolvable, which may eventually cause data retransmission from the sending end to the receiving end and affect the wireless system's transmission and reception performance.

[0071] Bit error rate formula:

[0072]

[0073] Where Ne represents the number of bits that err during transmission, and N represents the total number of bits transmitted;

[0074] Note: The lower the bit error rate, the higher the reliability of the communication system.

[0075] Frame error rate formula:

[0076]

[0077] This indicates the number of frames that malfunctioned during transmission. Indicates the total number of frames transmitted;

[0078] Note: The lower the frame error rate, the higher the reliability of the communication system.

[0079] The criteria for identifying high-quality frequency points are: a signal-to-noise ratio (SNR) of no less than 6, a bit error rate (BER) of no more than 1%, and a frame error rate (FERR) of no more than 5%. When the receiving station receives a frequency point message that meets all three conditions, that frequency point is designated as a candidate frequency point. After traversing all frequency points, among all candidate frequency points, the frequency point with a BER of 0% is marked as a high-quality frequency point. Among the high-quality frequency points, the frequency point with a BER of 0% in the most recent 10 BER rate statistics is ranked first. For multiple frequency points with a BER of 0% in the most recent 10 BER rate statistics, the frame error rate is ranked first. The frequencies are sorted again from low to high. For frequencies with the same frame error rate, they are sorted from low to high according to the signal-to-noise ratio. Other high-quality frequencies are then sorted from low to high frame error rate and from low to high signal-to-noise ratio. The selected frequencies (1-7) are stored as the optimal frequencies in the optimal frequency library and sent to the receiving station. If there are fewer than 7 frequencies with a bit error rate of 0, or if there are no frequencies with a bit error rate of 0% in the most recent 10 bit error rate statistics, the self-selection frequency mode is re-entered, and the high-quality frequencies are updated again until a frequency that meets the conditions appears.

[0080] Step 7: After receiving the high-quality frequency points sent by the receiving master station, the receiving station will select any usable frequency point from the received high-quality frequency points and respond three times in a row to confirm entering the synchronization mode.

[0081] Step 8: After the receiving master station and the receiving slave station enter the synchronization mode, the transmitting master station and the receiving master station exchange verification messages according to the self-selected frequency interaction timing, record and exchange the bit error rate of the transmitting and receiving parties, and after three cycles, output the high-quality frequency point and bit error rate to the panel and terminal software.

[0082] The frequency point ranked first during sorting is designated as the primary frequency point, and the other frequency points are designated as backup frequency points. The primary frequency point is selected as the communication frequency point for exchanging service frame information. If the bit error rate of the primary frequency point does not meet the standard within 2 cycles, the next backup frequency point with a bit error rate of 0 is selected. If it still does not meet the standard, the process continues to substitute the next available frequency point. If all 7 frequency points do not meet the standard, the process re-enters the self-selection frequency mode and updates the high-quality frequency point again.

[0083] The service frame primarily handles data service interactions; such as... Figure 6 As shown, a service frame includes a synchronization hop, a master frequency check hop, a service hop, and an exit hop. The synchronization hop contains four frequency points, and each hop includes information such as synchronization, TOD (Time of Decision), service / maintenance markings, and master frequency change information. The master frequency check is used to record the communication quality of the master frequency in real time. The service hop carries user information and uses an RS interleaving error correction matrix. The exit hop marks the end of the frame.

[0084] Maintenance frames are sent during idle periods and at preset intervals to check the frequency quality of the preferred frequency library and frequency hopping library, ensuring the health of the primary and backup frequency tables. During the check, all frequencies in the preferred frequency library are traversed first, followed by frequencies in the frequency hopping library not included in the preferred frequency library, thus achieving comprehensive testing. Figure 7 As shown, it includes synchronization hopping, primary frequency verification hopping, backup frequency monitoring hopping, and frequency hopping detection hopping. Among them, the backup frequency monitoring hopping is used to monitor the communication quality of the seven alternative frequency tables in real time; the frequency hopping monitoring hopping is used to monitor the communication quality of frequency points within the frequency hopping table, providing a quality basis for updating the primary and backup frequency table database.

[0085] This invention also discloses a communication system, the technical solution of which includes a transmitting radio and a receiving radio. The transmitting radio includes a transmitting master station and a transmitting slave station. The transmitting master station includes a first memory, a first transceiver, and a first processor, which are electrically connected. The first memory is used to store computer programs, frequency hopping libraries, and preferred frequency libraries; The first transceiver is used to send and receive data under the control of the first processor; The first processor runs the computer program stored in the first memory, obtains a random frequency point from the frequency hopping library in the first memory using a pseudo-random algorithm, and sends a link establishment message to the receiving station through the selected frequency point and the first transceiver according to the time slot table. The message contains synchronization, TOD, service / maintenance label, and master frequency change information. After sending, the first transceiver searches for response messages. Upon receiving any response message, when the time slot search ends, it switches to the synchronization frequency sweep mode. In the synchronization frequency sweep mode, the first processor sends a link establishment message to the transmitting station through the first transceiver. The link establishment message is sent periodically and cyclically, and the cyclical frequency points are the preferred frequency library and frequency hopping library randomly obtained through the pseudo-random algorithm. The frequency points in the frequency range are determined as follows: After sending the link establishment message, the first transceiver switches to receiving mode. After receiving the sender's reply message from the second transceiver, it sends the sender's reply message as a sender message to the third transceiver according to the frequency point of the sender's reply message. Then, the first transceiver switches to receiving mode. After receiving the receiver's reply message from the third transceiver, it retains the frequency point of the receiver's reply message in the preferred frequency library. After traversing the frequency points in the preferred frequency library, it traverses the frequency points in the frequency hopping library that are not included in the preferred frequency library again, and updates the preferred frequency library with the tested high-quality frequency points. During the update, all frequency points in the preferred frequency library are deleted, and the tested high-quality frequency points are stored in the preferred frequency library. The transmitter includes a second memory, a second transceiver, and a second processor, all three of which are electrically connected. The second memory is used to store computer programs; The second transceiver is used to send and receive data under the control of the second processor. The second processor runs the computer program stored in the second memory. When it receives the search and link establishment message from the transmitting master station through the second transceiver, it switches to the synchronous frequency sweep mode. In the synchronous frequency sweep mode, the second processor sends the transmitting station maintenance reply message to the transmitting radio master station one by one according to the frequency points sent by the first processor. The receiving radio station includes a main receiving station and subordinate receiving stations. The main receiving station includes a third memory, a third transceiver, and a third processor, all three of which are electrically connected. The third memory is used to store computer programs, evaluation results of frequency communication quality, and a preferred frequency library; The third transceiver is used to send and receive data under the control of the third processor; The third processor runs the computer program stored in the third memory. After receiving the link establishment message from the first transceiver via the third transceiver, it obtains the hop timing and hop random parameters, corrects its own TOD information based on the TOD information in the link establishment message, and obtains frequency information. It evaluates the signal-to-noise ratio, bit error rate, and frame error rate of the received signal, selects the best frequency and good frequency, and stores the evaluation results in the third memory. After evaluating all frequency points, it establishes a preferred frequency library and sends the frequency points in the preferred frequency library to the fourth transceiver of the receiving master station via the third transceiver. It sends a receiving response message to the first transceiver of the transmitting master station via the best frequency point in the preferred frequency library. The structure of the receiving response message is the same as the timing structure of the transmitting master station search. It switches the third transceiver to receiving mode. After receiving the receiving master station response message from the fourth transceiver, it performs link synchronization. The receiving unit includes a fourth memory, a fourth transceiver, and a fourth processor, all three of which are electrically connected; among them, The fourth memory is used to store computer programs; The fourth transceiver is used to send and receive data under the control of the fourth processor; The fourth processor runs the computer program stored in the fourth memory. When it receives the receiving master station's receiving link establishment message through the fourth transceiver, it sends the receiving subordinate station's response message using the frequency point information contained in the receiving link establishment message.

[0086] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for improving stability of radio communication in a complex environment, characterized in that, The method comprises the following steps: Step 1: After starting the radio station adaptive frequency selection function, the sending radio station periodically and cyclically sends a link establishment request according to the frequency points in the frequency hopping library, adopts a pseudo-random frequency hopping frame structure, and waits for the receiving radio station to respond; Step 2: The receiving radio station searches the self-frequency selection synchronization frame data; after receiving the self-frequency selection frame data, if the link establishment target is the local machine, the receiving radio station enters the self-frequency selection synchronization and obtains the time hopping sequence and random hopping parameters; after receiving any response information, the master station of the sending radio station enters the synchronous sweep frequency mode at the end of the search time slot; after receiving the search and link establishment message of the master station, the slave station of the sending radio station also enters the synchronous sweep frequency mode; in the synchronous sweep frequency mode, all frequency points in the frequency hopping library are traversed to select the optimal frequency point to establish an optimal frequency library; Step 3: The receiving radio station selects a frequency point in the optimal frequency library as a communication frequency point, synchronizes with the sending radio station, and exchanges business and information; Step 4: After synchronization, the sending and receiving radio stations exchange check messages according to the self-frequency selection interaction time sequence, record and exchange the bit error rates of the sending and receiving radio stations, and after three cycles, output the optimal frequency point and the bit error rate to the panel and terminal software.

2. The method of claim 1, wherein the method further comprises: In step 1, when the sending radio station sends a link establishment request, the master station of the sending radio station selects 14 frequency points from the frequency points in the frequency hopping table, divides them into two groups, each group containing 7 frequency points, each frequency point being hopped 2 times, and the sending being repeated 8 times.

3. The method of claim 2, wherein the method further comprises: Each of the 7 frequency points in each group contains complete synchronization and request instructions.

4. The method of claim 1, wherein the method further comprises: In step 2, after the master station and the slave station both enter the synchronous sweep frequency mode, at least one cycle of the cyclic transmission of search messages between the master station and the slave station is performed, each operation containing 7 frequency points, each frequency point being repeated 7 times, and the receiving radio station detecting the signal quality of the received frequency point in real time and feeding back the information to the other party in the next round of search time sequence; after traversing all the frequency points in the frequency hopping table, the master station of the receiving radio station selects 7 optimal frequency points to establish an optimal frequency library and sends it to the slave station; after receiving the optimal frequency points from the master station, the slave station continuously responds three times to the available frequency points to confirm the entry into the synchronous mode, and then step 3 is performed.

5. The method of claim 4, wherein the method further comprises: The mechanism for selecting the optimal frequency point adopts three quality comprehensive determination measures of signal-to-noise ratio, bit error rate and frame error rate.

6. The method for improving stability of radio communication in complex environment according to claim 5, characterized in that: The frequency point that simultaneously satisfies the signal-to-noise ratio of not less than 6, the bit error rate of not greater than 1%, and the frame error rate of not greater than 5% is determined as the optimal frequency point.

7. The method of claim 6, wherein the method further comprises: The frequency points in the optimal frequency library are divided into master frequency points and backup frequency points according to the quality, and master and backup frequency tables are established; the master frequency point is selected as the communication frequency point to exchange business and information; the exchanged data includes two data structures of business frames and maintenance frames.

8. The method of claim 7, wherein the method further comprises: The business frame contains a synchronization hop, a master frequency check hop, a business hop, and an exit hop; the synchronization hop contains 4 frequency points, each hop containing synchronization, TOD, business / maintenance marking, and master frequency change information.

9. The method for improving stability of radio communication in complex environment according to claim 7, characterized in that: The maintenance frame is sent when the business is idle or at a preset period, and is used to detect the quality of the frequency points in the optimal frequency library and the frequency hopping library to maintain the health of the master and backup frequency tables; The maintenance frame contains a synchronization hop, a master frequency check hop, a backup frequency monitoring hop, and a frequency hopping detection hop.

10. A communication system comprising a sender station and a receiver station, the sender station comprising a sender master station and a sender slave station, the sender master station comprising a first memory, a first transceiver and a first processor, which are electrically connected, the sender slave station comprising a second memory, a second transceiver and a second processor, which are electrically connected, the receiver station comprising a receiver master station and a receiver slave station, the receiver master station comprising a third memory, a third transceiver and a third processor, which are electrically connected, the receiver slave station comprising a fourth memory, a fourth transceiver and a fourth processor, which are electrically connected, characterized in that: the first memory is used for storing a computer program, a frequency hopping library and a preferred frequency library; the first transceiver is used for receiving and transmitting data under the control of the first processor; the first processor runs the computer program stored in the first memory, obtains a random frequency point from the frequency hopping library of the first memory through a pseudo-random algorithm, and sends a link establishment message to the receiver station through the selected frequency point and the first transceiver according to a time slot table, the message containing synchronization, TOD, service / maintenance mark, and primary frequency change information; after sending, the first transceiver searches for a response message; after receiving any response message, at the end of the time slot, the first processor enters a synchronous sweep frequency mode, in which the first processor sends a link establishment message to the sender slave station through the first transceiver, the link establishment message being sent periodically and cyclically, the frequency points of the cycle being randomly obtained from the preferred frequency library and the frequency hopping library through a pseudo-random algorithm; after sending the link establishment message, the first transceiver enters a receiving mode, and after receiving the reply message of the sender slave station from the second transceiver, the first transceiver sends the reply message of the sender slave station to the third transceiver as a sender message according to the frequency point of the reply message of the sender slave station, and then enters the receiving mode again; after receiving the reply message of the receiver from the third transceiver, the frequency point of the reply message is reserved in the preferred frequency library; after traversing the frequency points in the preferred frequency library, the frequency points not included in the preferred frequency library in the frequency hopping library are traversed again, and the high-quality frequency points tested are updated in the preferred frequency library; when updating, all frequency points in the preferred frequency library are deleted, and the tested high-quality frequency points are stored in the preferred frequency library; the second memory is used for storing a computer program; the second transceiver is used for receiving and transmitting data under the control of the second processor; the second processor runs the computer program stored in the second memory, and when receiving the search and link establishment messages of the sender master station through the second transceiver, enters a synchronous sweep frequency mode; in the synchronous sweep frequency mode, the second processor sends the reply message of the sender slave station to the sender master station one by one according to the received frequency points sent by the first processor; the third memory is used for storing a computer program, an evaluated frequency point communication quality result and a preferred frequency library; the third transceiver is used for receiving and transmitting data under the control of the third processor; The third processor runs the computer program stored in the third memory, obtains the hop time sequence and the hop random parameter after receiving the link establishment packet sent by the first transceiver through the third transceiver, corrects the TOD information according to the TOD information in the link establishment packet, and obtains the frequency point information; the signal-to-noise ratio, the bit error rate and the frame error rate of the received signal are evaluated, if the signal-to-noise ratio is not less than 6, the bit error rate is not greater than 1%, and the frame error rate is not greater than 5%, the frequency point is determined as a high-quality frequency point, otherwise it is determined as a general frequency point, and the evaluation result is stored in the third memory; after evaluating all frequency points, the best frequency point is established as an optimal frequency library, and the frequency point in the optimal frequency library is sent to the fourth transceiver of the receiving main station through the third transceiver; the high-quality frequency point in the optimal frequency library is used to send the receiving response packet to the first transceiver of the sending main station, the structure of the receiving response packet is the same as that of the sending main station search time sequence; the third transceiver is converted to a receiving state; after receiving the receiving station response packet sent by the fourth transceiver, link synchronization is performed; The fourth memory is used for storing a computer program; The fourth transceiver is used for receiving and sending data under the control of the fourth processor; The fourth processor runs the computer program stored in the fourth memory, and sends the receiving station response packet through the frequency point information contained in the receiving link establishment packet of the receiving main station when the fourth transceiver receives the receiving link establishment packet of the receiving main station.

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