The invention discloses a shortwave multiuser communication method and system based on the wideband multichannel receiving technology. The method comprises the following steps: an initiator selects link establishment call frequency within a shortwave band and initiates a link establishment call, and a receiver sends responses on different response frequency at the same time; the initiator receivesand judges whether the response signals satisfy a link establishment condition; the initiator decides the communication receiving and transmitting frequency of the present service and issues the sameto all receivers; after the communication link is established, the initiator divides data into several data frames, and selects the frequency to send the current to-be-sent data frame; the receiver judges whether the data frame is correct and sends and receives the feedback information of the data frame on different frequency at the same time; and the initiator determines whether to send the nextdata frame according to the received feedback information until all data frames of the data are sent. Compared with the traditional shortwave communication based on single transmitting and single receiving technology, the shortwave multiuser communication method and system have the advantages of greatly shortening the link establishment and the service communication time.

Shortwave multiuser communication method and system based on wideband multichannel receiving technology

The invention discloses a call link automatic establishing method suitable for a medium-high frequency radio station. The method is based on GPS second pulse timing synchronization. According to GPS time changes, the plurality of medium-high frequency radio stations which are in a same frequency group are kept in a same pair of variable transmit-receive frequencies. The two radio stations which need to establish communication in the plurality of medium-high frequency radio stations select appropriate communication frequencies from the pair of transmit-receive frequencies where the radio stations are kept, and the call link of both medium-high frequency radio stations is automatically established. By using the method of the invention, construction steps are simple, a hardware resource demand is less, a GPS timing module only needs to be added in a current medium-high frequency, and the automatic selection of the communication frequencies of the both medium-high frequency radio stationsparticipating in communication and the automatic establishment of the call link can be completed without any other hardware circuit modification. In the invention, blind automatic selection and establishment of communication channels between both medium-high frequency radio station communication parties can be realized, and the success rate of communication link establishment between the both medium-high frequency radio station communication parties of current maritime affairs is greatly increased.

Call link automatic establishing method suitable for medium-high frequency radio station

The method is suitable for the technical field of short-wave communication. The invention provides a quick frequency-selecting link-establishing and voice service transmission method for a short-waveaccess network. The quick frequency-selecting link-establishing access communication is a communication contact mode with wireless combination, which is realized by performing access transfer betweenremote wireless users or between a remote wireless user and a wired user by means of an access node. Specifically, according to whether a frequency is planned in advance or not, a corresponding fast frequency selection and link establishment technical scheme is adopted, the advantages of fast frequency selection and link establishment are fully explored, and a far-end wireless user can achieve theeffect of fast link establishment by automatically selecting a fixed station access node with good channel quality for access.

Quick frequency-selecting link-establishing and voice service transmission method for short-wave access network

The invention relates to a frequency selection method and device based on short wave communication, computer equipment and a storage medium, and the method comprises the steps: determining a communication frequency band corresponding to a communication parameter according to the communication parameter, wherein the communication parameters comprise communication distance parameters and communication time parameters; determining an initial call frequency according to the communication frequency band; enabling a control master station to send an empty data packet to the slave station according to the initial call frequency; and determining the communication frequency between the master station and the slave station according to the response message sent by the slave station. According to the method, the transmission real-time performance of determining the communication frequency is improved, and the efficiency of determining the communication frequency of the master station and the slave station is improved.

Frequency selection method and device based on short wave communication, computer equipment and storage medium

The invention is applicable to the technical field of short wave communication networks, and provides a private network frequency-selecting networking chain building method based on a short wave channel. The method comprises the following steps: a stable and reliable time synchronization system is built and a standard synchronous clock is provided via satellite timing equipment; all users in a subnet shares a common frequency set, and after start-up, the users synchronously scan the frequency set under the control of the synchronous clock; when in communication, a source user computes next time slot resident frequency of a target user, and initiates a call on the frequency; and after communication business between the source user and the target user is completed by building a chain therebetween, the frequency is released for the other users. According to the method provided by the invention, depending on the time synchronization system formed by Beidou or GPS, the source user computes the next time slot resident frequency of the target user, and then initiates the call on the frequency, so that frequency consistency between two communication parties is ensured, and channel quality is improved; waveform with a minimum format is used, so that utilization frequency is small, and time for building the short wave chain is short.

Private network frequency-selecting networking chain building method based on short wave channel

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Private network frequency-selecting networking chain building method based on short wave channel