CN104485985B - Letter transfer device and letter transfer method suitable for short-wave radio station communication - Google Patents
Letter transfer device and letter transfer method suitable for short-wave radio station communication Download PDFInfo
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Abstract
The invention belongs to the technical field of wireless communication transfer, and particularly relates to a transfer device and a transfer method suitable for short-wave radio station communication. This transfer letter device suitable for short wave radio communication includes 4 short wave radio stations and annexs, voltage stabilizing circuit, switching power supply, ARM treater and peripheral circuit, level conversion circuit, audio frequency processing circuit, modem module, the VCC end electric connection switching power's of ARM treater output, level conversion circuit's TTL end electric connection ARM treater corresponds the port, level conversion circuit's RS232 end electric connection short wave radio station corresponds the port, short wave radio station is connected to audio frequency processing circuit's receiving terminal, modem module's audio input end is connected to the output.
Description
Technical Field
The invention belongs to the technical field of wireless communication transfer, and particularly relates to a transfer device and a transfer method suitable for short-wave radio station communication.
Background
The fact that a signal in a wireless communication is propagated straight and meets a special obstacle, the signal cannot pass through the obstacle or the signal is interfered by a complex electromagnetic environment is one of main factors influencing the communication distance. Under the condition that the terrain environment cannot be changed, the field without a high-power long antenna or the electromagnetic environment of a local area is complex, the problem that the communication is blocked is obviously unrealistic, so that the use of a radio station in a special environment is blocked, and the communication distance and the communication effect of the radio station are limited.
Disclosure of Invention
The invention aims to provide a message forwarding device and a message forwarding method suitable for short-wave radio station communication. The invention can solve the difficulty of communication obstruction caused by environmental factors without changing the existing communication means and equipment, and can achieve the purpose of simply extending the communication distance.
In order to achieve the technical purpose, the invention is realized by adopting the following technical scheme.
The first technical scheme is as follows:
a letter transfer device suitable for short-wave radio station communication, characterized by comprising: the system comprises a first communication module, a second communication module, a twisted-pair line, a first short-wave radio station and a fourth short-wave radio station, wherein the first short-wave radio station and the second short-wave radio station form two-way wireless communication connection, and the third short-wave radio station and the fourth short-wave radio station form two-way wireless communication connection; the second short wave radio station has an audio signal output and an audio signal input, and the third short wave radio station has an audio signal output and an audio signal input; the first communication module is respectively and electrically connected with an audio signal output end and an audio signal input end of a second short-wave radio station, and the second communication module is respectively and electrically connected with an audio signal output end and an audio signal input end of a third short-wave radio station;
each signal forwarding module comprises a modulation and demodulation module and an ARM processor, each modulation and demodulation module comprises a demodulator and a modulator, the modulator of each modulation and demodulation module is provided with a sending end and a receiving end, the demodulator of each modulation and demodulation module is provided with a sending end and a receiving end, and the ARM processor is provided with a first UART interface to a fourth UART interface; the receiving end of the second UART interface of the ARM processor of each letter forwarding module is electrically connected with the audio signal output end of the corresponding short-wave radio station, the ARM processor of each letter forwarding module is used for transmitting a signal from the receiving end of the second UART interface to the transmitting end of a fourth UART interface, and the transmitting end of the fourth UART interface of the ARM processor of each letter forwarding module is electrically connected with the receiving end of the modulator of the corresponding modulation and demodulation module; the transmitting end of the demodulator of each modulation and demodulation module is electrically connected with the receiving end of the fourth UART interface of the corresponding ARM processor, the ARM processor of each letter forwarding module is used for transmitting a signal from the receiving end of the fourth UART interface to the transmitting end of the second UART interface, and the transmitting end of the second UART interface of the ARM processor of each letter forwarding module is electrically connected with the audio signal input end of the corresponding short-wave radio station;
the transmitting end of the modulator of the modulation and demodulation module of the first relay module is electrically connected with the receiving end of the demodulator of the modulation and demodulation module of the second relay module through a twisted pair, and the receiving end of the demodulator of the modulation and demodulation module of the first relay module is electrically connected with the transmitting end of the modulator of the modulation and demodulation module of the second relay module through a twisted pair.
The second technical scheme is as follows:
a letter transfer method suitable for short-wave radio communication is based on the letter transfer device suitable for short-wave radio communication, and comprises the following steps:
when the first short-wave radio station sends out a radio frequency signal, the second short-wave radio station receives the radio frequency signal from the first short-wave radio station, and the second short-wave radio station processes the received radio frequency signal and converts the received radio frequency signal into an audio signal; the second short wave radio station sends the audio signal to a receiving end of a second UART interface of an ARM processor of the first communication module, the ARM processor of the first communication module transmits the signal from the receiving end of the second UART interface to a sending end of a fourth UART interface, and the sending end of the fourth UART interface of the ARM processor of the first communication module sends the received signal to the receiving end of a modulator of a modulation and demodulation module of the first communication module; the modulator of the modulation and demodulation module of the first signal conversion module modulates the received signal and sends the modulated signal out through a sending end of the modulator and demodulation module; the transmitting end of the modulator of the modulation and demodulation module of the first signal conversion module transmits the received signal to the receiving end of the demodulator of the modulation and demodulation module of the second signal conversion module through a twisted pair;
the demodulator of the modulation and demodulation module of the second signal forwarding module demodulates the received signal and sends the demodulated audio signal to the sending end of the demodulator of the modulation and demodulation module of the second signal forwarding module; the transmitting end of the demodulator of the modulation and demodulation module of the second letter forwarding module transmits the received audio signal to the receiving end of the fourth UART interface of the ARM processor of the second letter forwarding module, the ARM processor of the second letter forwarding module transmits the audio signal from the receiving end of the fourth UART interface to the transmitting end of the second UART interface, and the transmitting end of the second UART interface of the ARM processor of the second letter forwarding module transmits the received audio signal to the audio signal input end of the third short-wave radio station; the third short-wave radio station converts the received audio signals into radio frequency signals and sends the radio frequency signals generated by conversion to the outside, and the fourth short-wave radio station receives the radio frequency signals from the third short-wave radio station;
when the fourth short-wave radio station sends out radio frequency signals, the third short-wave radio station receives the radio frequency signals from the fourth short-wave radio station, and the third short-wave radio station processes the received radio frequency signals and converts the received radio frequency signals into audio signals; the third short wave radio station sends the audio signal to a receiving end of a second UART interface of an ARM processor of the second letter transferring module, the ARM processor of the second letter transferring module transmits the signal from the receiving end of the second UART interface to a sending end of a fourth UART interface, and the sending end of the fourth UART interface of the ARM processor of the second letter transferring module sends the received signal to the receiving end of a modulator of a modulation and demodulation module of the second letter transferring module; the modulator of the modulation and demodulation module of the second signal transfer module modulates the received signal and sends the modulated signal out through the sending end of the modulator and demodulation module; the transmitting end of the modulator of the modulation and demodulation module of the second signal transferring module transmits the received signal to the receiving end of the demodulator of the modulation and demodulation module of the first signal transferring module through the twisted pair;
the demodulator of the modulation and demodulation module of the first communication module demodulates the received signal and sends the demodulated audio signal to the sending end of the demodulator of the modulation and demodulation module of the first communication module; the transmitting end of the demodulator of the modulation and demodulation module of the first communication module transmits the received audio signal to the receiving end of the fourth UART interface of the ARM processor of the first communication module, the ARM processor of the first communication module transmits the audio signal from the receiving end of the fourth UART interface to the transmitting end of the second UART interface, and the transmitting end of the second UART interface of the ARM processor of the first communication module transmits the received audio signal to the audio signal input end of the second short-wave radio station; the second short-wave radio station converts the received audio signals into radio frequency signals and transmits the radio frequency signals generated by conversion to the outside, and the first short-wave radio station receives the radio frequency signals from the third short-wave radio station.
The invention has the beneficial effects that: the transfer communication of the radio station can be realized under the condition of not changing the existing communication means and equipment; the method can process and control the transfer data, and realize automatic transfer processing.
Drawings
Fig. 1 is a schematic general structure diagram of a message forwarding device suitable for short-wave radio communication according to the present invention;
fig. 2 is a schematic structural diagram of a letter transfer module of a letter transfer device suitable for short-wave radio communication according to the present invention;
fig. 3 is a schematic diagram of the transmission of the transfer data in the transfer method for the communication of the short wave radio station according to the present invention;
fig. 4 is a schematic diagram illustrating transmission of a transceiving instruction in the relay method for short-wave radio communication according to the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
referring to fig. 1, a schematic diagram of an overall structure of a message forwarding device suitable for short-wave radio communication according to the present invention is shown. Fig. 2 is a schematic structural diagram of a letter transfer module of a letter transfer device suitable for short-wave radio station communication according to the present invention. This transfer letter device suitable for short wave radio station communication includes first short wave radio station to fourth short wave radio station, and first short wave radio station forms two-way radio communication with the second short wave radio station and is connected, third short wave radio station forms two-way radio communication with the fourth short wave radio station and is connected. Each short-wave radio station is provided with an audio signal output end and an audio signal input end, when the audio signals are converted into radio frequency signals by the first short-wave radio station and are sent out, the received corresponding radio frequency signals are converted into audio signals by the second short-wave radio station, and the audio signals are output out from the audio signal output end. Similarly, when the fourth short-wave radio station converts the audio signal into a radio frequency signal and sends the radio frequency signal outwards, the third short-wave radio station converts the received corresponding radio frequency signal into the audio signal and outputs the audio signal outwards from the audio signal output end. In the embodiment of the invention, each short-wave radio station also has a non-audio data and instruction transmission function, when the first short-wave radio station converts non-audio data and instructions into radio frequency signals and sends the radio frequency signals outwards, the second short-wave radio station converts the received corresponding radio frequency signals into non-audio data and instructions, encapsulates the non-audio data and instructions into SLIP data packets conforming to RS-232 level, and outputs the SLIP data packets outwards. Similarly, when the fourth short-wave radio station converts the non-audio data and the instructions into radio-frequency signals and sends the radio-frequency signals outwards, the third short-wave radio station converts the received corresponding radio-frequency signals into the non-audio data and the instructions, encapsulates the non-audio data and the instructions into SLIP data packets conforming to the RS-232 level, and outputs the SLIP data packets outwards. Among the above-mentioned four short wave radio stations, second short wave radio station and third short wave radio station are the short wave radio station of support letter transfer function, and first short wave radio station and fourth short wave radio station are the short wave radio station of general type.
In the embodiment of the invention, the signal transferring device suitable for the short-wave radio station communication further comprises a first signal transferring module, a second signal transferring module and a plurality of twisted-pair lines, wherein the length of each twisted-pair line is not more than 5 km. The first signal conversion module is respectively and electrically connected with the audio signal output end and the audio signal input end of the second short-wave radio station, and the second signal conversion module is respectively and electrically connected with the audio signal output end and the audio signal input end of the third short-wave radio station. Each signal conversion module comprises a modulation and demodulation module and an ARM processor, each modulation and demodulation module comprises a demodulator and a modulator, the modulator of each modulation and demodulation module is provided with a sending end and a receiving end, the demodulator of each modulation and demodulation module is provided with a sending end and a receiving end, and the sending end of the modulator of each modulation and demodulation module and the receiving end of the demodulator of the modulator of each modulation and demodulation module respectively adopt mature K interfaces, so that long-distance wired transmission between the two modulation and demodulation modules is facilitated.
In the embodiment of the invention, the ARM processor of each letter transferring module is provided with a first UART interface to a fourth UART interface; the receiving end of the second UART interface of the ARM processor of each letter forwarding module is electrically connected with the audio signal output end of the corresponding short-wave radio station, the ARM processor of each letter forwarding module is used for transmitting a signal from the receiving end of the second UART interface to the transmitting end of the fourth UART interface, and the transmitting end of the fourth UART interface of the ARM processor of each letter forwarding module is electrically connected with the receiving end of the modulator of the corresponding modem module; the transmitting end of the demodulator of each modulation and demodulation module is electrically connected with the receiving end of the fourth UART interface of the corresponding ARM processor, the ARM processor of each letter transferring module is used for transmitting a signal from the receiving end of the fourth UART interface to the transmitting end of the second UART interface, and the transmitting end of the second UART interface of the ARM processor of each letter transferring module is electrically connected with the audio signal input end of the corresponding short-wave radio station. The transmitting end of the modulator of the modulation and demodulation module of the first relay module is electrically connected with the receiving end of the demodulator of the modulation and demodulation module of the second relay module through a twisted pair, and the receiving end of the demodulator of the modulation and demodulation module of the first relay module is electrically connected with the transmitting end of the modulator of the modulation and demodulation module of the second relay module through a twisted pair.
In the embodiment of the invention, the ARM processor is an STM32F103RET6 embedded processing chip. The STM32F103RET6 embedded processing chip is based on a Cotex-M3 kernel, has the characteristics of low power consumption, high processing speed, rich peripheral resources and low cost, and is completely suitable for transfer processing. In the embodiment of the present invention, the peripheral circuit matched with the STM32F103RET6 embedded processing chip includes: a clock generation circuit and an RC reset circuit. The output end of the clock generation circuit is connected with a clock input pin of the STM32F103RET6 embedded processing chip to provide a working clock for the clock input pin; the RC reset circuit is connected with a reset pin of the STM32F103RET6 embedded processing chip, and the program can start to run normally after the RC reset circuit is powered on. The STM32F103RET6 embedded processing chip is also equipped with a JTAG programming interface for online programming and debugging use.
In the embodiment of the invention, each relay module is also provided with an audio processing circuit, and the audio processing circuit of the first relay module is connected in series between the audio signal output end of the second short-wave radio station and the receiving end of the second UART interface of the ARM processor of the first relay module, and is connected in series between the audio signal input end of the second short-wave radio station and the transmitting end of the second UART interface of the ARM processor of the first relay module. And the audio processing circuit of the first communication module is used for processing the audio signal output by the second short-wave radio station and processing the audio signal output by the ARM processor of the first communication module. The audio signal processing is performed by changing the amplitude of the audio signal (increasing the amplitude of the audio signal, attenuating the audio signal, performing automatic gain control on the audio signal, or the like) through adjustment of the corresponding potentiometer. The audio processing circuit of the second telecommunications module functions similarly to the audio processing circuit of the first telecommunications module.
In the embodiment of the invention, the input end of each signal conversion module is connected with 13.8V direct current, when the voltage stabilizing circuit works, the 13.8V direct current is converted into 5V direct current, at the moment, the voltage stabilizing circuit outputs the 5V direct current outwards, and the output end of the voltage stabilizing circuit is respectively and electrically connected with the input end of the switching power supply and the power supply end of the corresponding modulation and demodulation module, so that the voltage stabilizing circuit provides 5V direct current for the corresponding modulation and demodulation module, and the corresponding modulation and demodulation module can work normally. The switching power supply is used for converting the 5V direct current into the 3.3V direct current, the output end of the switching power supply is respectively and electrically connected with the power supply end of the corresponding level conversion circuit and the power supply end of the corresponding ARM processor, and the switching power supply is used for respectively providing working power supply for the corresponding level conversion circuit and the corresponding ARM processor. In the embodiment of the invention, the second short-wave circuit can output 13.8V direct current, the third short-wave circuit can output 13.8V direct current, at the moment, the direct current output end of the second short-wave circuit is electrically connected with the input end of the corresponding voltage stabilizing circuit, the direct current output end of the third short-wave circuit is electrically connected with the input end of the corresponding voltage stabilizing circuit, and the voltage stabilizing circuit of each letter forwarding module can work normally.
In the embodiment of the invention, when a first short-wave radio station sends a signal to a fourth short-wave radio station, the first short-wave radio station firstly transmits the data or voice signal to be sent to a second short-wave radio station in a wireless mode through an antenna, the second short-wave radio station gives the signal to a first signal transmission module for processing, and then transmits the signal to a second signal transmission module in a wired mode through a twisted pair, the second signal transmission module gives the signal to a third short-wave radio station, and the third short-wave radio station transmits the signal to the fourth short-wave radio station in a wireless mode through the antenna. The processing of two letter modules to the signal is automatic to be accomplished completely, and second short wave radio station, third short wave radio station and two letter modules of transferring can place in unmanned on duty's environment completely, for example: two locations, either at the top and bottom of the bag, or one in a complex electromagnetic environment and one remote from the other in the environment (the separation between the two locations does not exceed 5km), can place two relay stations (i.e. a second short wave station and a third short wave station) respectively. In the embodiment of the invention, the two letter transfer modules are the key points for realizing signal letter transfer and are the main contents of the implementation of the invention, and other components are only indispensable components for verifying the realization effect of the letter transfer device. In the embodiment of the invention, when the fourth short-wave radio station needs to transmit signals to the first short-wave radio station, the reverse process of transmitting signals from the first short-wave radio station to the fourth short-wave radio station is performed. It should be noted that the communication between the first short-wave radio station and the fourth short-wave radio station is actually realized by the communication between the first short-wave radio station and the second short-wave radio station and the communication between the third short-wave radio station and the fourth short-wave radio station through the relay device as a bridge, so that when the first short-wave radio station and the second short-wave radio station use a certain communication frequency and rate, the third short-wave radio station and the fourth short-wave radio station can use another communication frequency and rate different from the former (i.e., the first short-wave radio station and the second short-wave radio station).
In the embodiment of the invention, based on the message forwarding device suitable for the communication of the short-wave radio station, a message forwarding method suitable for the communication of the short-wave radio station is also provided. Referring to fig. 3, a schematic diagram of data transmission in a short-wave radio station communication method according to the present invention is shown. Fig. 4 is a schematic diagram illustrating transmission of a transceiving instruction in the relay method for short-wave radio communication according to the present invention. The letter transfer method suitable for short-wave radio station communication comprises the following steps:
when the first short-wave radio station sends out radio frequency signals, the second short-wave radio station receives the radio frequency signals from the first short-wave radio station, and the second short-wave radio station processes the received radio frequency signals and converts the received radio frequency signals into audio signals. The second short-wave radio station sends the audio signal to a receiving end (marked as UART2_ RX in fig. 3) of a second UART interface of the ARM processor of the first transponding module, the ARM processor of the first transponding module transmits the signal from the receiving end of the second UART interface thereof to a transmitting end (marked as UART4_ TX in fig. 3) of a fourth UART interface, and the transmitting end of the fourth UART interface of the ARM processor of the first transponding module sends the received signal to the receiving end of the modulator of the modem module of the first transponding module; the modulator of the modulation and demodulation module of the first signal conversion module modulates the received signal and sends the modulated signal out through a sending end of the modulator and demodulation module; the transmitting end of the modulator of the modulation and demodulation module of the first signal conversion module transmits the received signal to the receiving end of the demodulator of the modulation and demodulation module of the second signal conversion module through the twisted pair.
The demodulator of the modulation and demodulation module of the second signal forwarding module demodulates the received signal and sends the demodulated audio signal to the sending end of the demodulator of the modulation and demodulation module of the second signal forwarding module; a transmitting end of a demodulator of a modem module of the second letter forwarding module transmits a received audio signal to a receiving end (marked as UART4_ RX in fig. 3) of a fourth UART interface of an ARM processor of the second letter forwarding module, the ARM processor of the second letter forwarding module transmits the audio signal from the receiving end of the fourth UART interface thereof to the transmitting end (marked as UART2_ TX in fig. 3) of the second UART interface, and the transmitting end of the second UART interface of the ARM processor of the second letter forwarding module transmits the received audio signal to an audio signal input end of a third short-wave radio station; the third short-wave radio station converts the received audio signals into radio frequency signals and transmits the radio frequency signals generated by conversion to the outside, and the fourth short-wave radio station receives the radio frequency signals from the third short-wave radio station.
When the fourth short-wave radio station sends out radio frequency signals, the third short-wave radio station receives the radio frequency signals from the fourth short-wave radio station, and the third short-wave radio station processes the received radio frequency signals and converts the received radio frequency signals into audio signals; the third short wave radio station sends the audio signal to a receiving end of a second UART interface of an ARM processor of the second letter transferring module, the ARM processor of the second letter transferring module transmits the signal from the receiving end of the second UART interface to a sending end of a fourth UART interface, and the sending end of the fourth UART interface of the ARM processor of the second letter transferring module sends the received signal to the receiving end of a modulator of a modulation and demodulation module of the second letter transferring module; the modulator of the modulation and demodulation module of the second signal transfer module modulates the received signal and sends the modulated signal out through the sending end of the modulator and demodulation module; and the transmitting end of the modulator of the modulation and demodulation module of the second signal transmission module transmits the received signal to the receiving end of the demodulator of the modulation and demodulation module of the first signal transmission module through the twisted pair.
The demodulator of the modulation and demodulation module of the first communication module demodulates the received signal and sends the demodulated audio signal to the sending end of the demodulator of the modulation and demodulation module of the first communication module; the transmitting end of the demodulator of the modulation and demodulation module of the first communication module transmits the received audio signal to the receiving end of the fourth UART interface of the ARM processor of the first communication module, the ARM processor of the first communication module transmits the audio signal from the receiving end of the fourth UART interface to the transmitting end of the second UART interface, and the transmitting end of the second UART interface of the ARM processor of the first communication module transmits the received audio signal to the audio signal input end of the second short-wave radio station; the second short-wave radio station converts the received audio signals into radio frequency signals and transmits the radio frequency signals generated by conversion to the outside, and the first short-wave radio station receives the radio frequency signals from the third short-wave radio station.
When the second short-wave radio station outputs an audio signal outwards, the SLIP protocol data packet which accords with the RS-232 level is output at the same time, the SLIP protocol data packet which accords with the RS-232 level and is output by the second short-wave radio station comprises a sending signal instruction and useful data (the transmission is carried out in the frame format of the SLIP packet, the SLIP is a link layer transmission protocol and is widely applied to the communication of an asynchronous serial port, a UART serial interface receives or sends a frame of data each time, and the instructions for controlling frame transmission comprise a request data sending instruction, an end data sending instruction, a start data receiving instruction, an end data receiving instruction, an allowance data sending instruction and a prohibition data sending instruction, and the instructions for controlling the state of the short-wave radio station comprise a sending signal instruction and a receiving signal instruction, wherein the level conversion circuit of the first communication module receives the SLIP protocol data packet output by the second short-wave radio station, converts the SLIP protocol data packet which accords with the RS-232 level into a TTL protocol, transmitting the SLIP protocol data packet conforming to the TTL level to a receiving end (marked as UART1_ RX in fig. 4) of a first UART interface of the ARM processor of the first signaling module; an ARM processor of the first communication module extracts a signal sending instruction which accords with TTL level from a SLIP protocol data packet received by a receiving end of a first UART interface of the ARM processor; the ARM processor of the first signaling module sends the sending signal instruction meeting the TTL level to a sending end (marked as UART3_ TX in fig. 4) of a third UART interface thereof, and the sending end of the third UART interface of the ARM processor of the first signaling module sends the sending signal instruction meeting the TTL level to a receiving end of a modulator of a modem module of the first signaling module; a modulator of the modem module of the first relay module modulates the transmission signal instruction meeting the TTL level, and transmits the modulated transmission signal instruction meeting the TTL level to a demodulator of the modem module of the second relay module, and a demodulator of the modem module of the second relay module demodulates the modulated transmission signal instruction meeting the TTL level, and transmits the demodulated transmission signal instruction meeting the TTL level to a receiving end (labeled as UART3_ RX in fig. 4) of a third UART interface of an ARM processor of the second relay module; an ARM processor of the second signal transferring module generates a received signal instruction which accords with the TTL level according to a demodulated sent signal instruction which accords with the TTL level and is received by a receiving end of a third UART interface of the ARM processor; the ARM processor of the second relay module sends a received signal instruction conforming to the TTL level to the level conversion circuit of the second relay module through the sending end (marked as UART1_ TX in fig. 4) of the first UART interface, the level conversion circuit of the second relay module converts the received signal instruction conforming to the TTL level into a received signal instruction conforming to the RS-232 level, and sends the received signal instruction conforming to the RS-232 level to the third short wave radio station; and the third short wave radio station receives the demodulated audio signal from the transmitting end of the demodulator of the modulation and demodulation module of the second message forwarding module according to the received signal instruction.
When the first communication module sends data to the second communication module, if the SLIP packet received by the receiving end of the fourth UART interface of the ARM processor of the second communication device module is data (useful data) to be communicated, the SLIP packet is cached, and if the received SLIP packet is a "start data receiving" instruction, a data sending request instruction is sent by the sending end of the second UART interface of the ARM processor of the second communication device module until the receiving end of the second UART interface of the ARM processor of the second communication device module receives a response allowing the data sending instruction, and then the cached SLIP packet is sent one by the sending end of the second UART interface of the ARM processor of the second communication device module. In the data transmission process, when the receiving end of the second UART interface of the ARM processor of the second credit extension module receives the data transmission prohibition instruction, the transmission of the SLIP packet is temporarily stopped, and the received SLIP packet is cached continuously through the receiving end of the fourth UART interface of the ARM processor of the second credit extension module. When the receiving end of the fourth UART interface of the ARM processor of the second forwarding module receives the data receiving end instruction, it indicates that all the SLIP data packets have been transmitted.
When the third short-wave radio station outputs an audio signal outwards, the SLIP protocol data packet which accords with the RS-232 level is output at the same time, and the SLIP protocol data packet which accords with the RS-232 level and is output by the third short-wave radio station comprises a signal sending instruction; a level conversion circuit of the second letter conversion module receives a SLIP protocol data packet output by a third short-wave radio station, converts the SLIP protocol data packet conforming to the RS-232 level into a SLIP protocol data packet conforming to the TTL level, and sends the SLIP protocol data packet conforming to the TTL level to a receiving end of a first UART interface of an ARM processor of the second letter conversion module; an ARM processor of the second signal forwarding module extracts a signal sending instruction which accords with TTL level from a SLIP protocol data packet received by a receiving end of a first UART interface of the ARM processor; the transmitting end of the third UART interface of the ARM processor of the second letter forwarding module transmits the transmitting signal instruction which accords with the TTL level to the receiving end of the modulator of the modulation and demodulation module of the second letter forwarding module; the modulator of the modulation and demodulation module of the second transfer module modulates the sending signal instruction which accords with the TTL level, and sends the modulated sending signal instruction which accords with the TTL level to the demodulator of the modulation and demodulation module of the first transfer module; the ARM processor of the first communication module generates a received signal instruction which accords with the TTL level according to a demodulated sent signal instruction which accords with the TTL level and is received by a receiving end of a third UART interface of the ARM processor; the ARM processor of the first transfer module sends a received signal instruction which accords with a TTL level to a level conversion circuit of the first transfer module through a sending end of a first UART interface of the ARM processor, the level conversion circuit of the first transfer module converts the received signal instruction which accords with the TTL level into a received signal instruction which accords with an RS-232 level, and the level conversion circuit of the first transfer module sends the received signal instruction which accords with the RS-232 level to a second short-wave radio station; and the second short wave radio station receives the demodulated audio signal from the transmitting end of the demodulator of the modulation and demodulation module of the first signal forwarding module according to the received signal instruction.
When a receiving end of a first UART interface of an ARM processor of the first letter forwarding module and a receiving end of a third UART interface of the ARM processor of the first letter forwarding module simultaneously receive a signal sending instruction which accords with TTL level, the ARM processor of the first letter forwarding module clears the audio signal received by the receiving end of the second UART interface, and the ARM processor of the first letter forwarding module clears the audio signal received by the receiving end of the fourth UART interface until only one of the receiving end of the first UART interface of the ARM processor of the first letter forwarding module and the receiving end of the third UART interface of the ARM processor of the first letter forwarding module receives the signal sending instruction, the corresponding audio signal clearing process is stopped, and the letter forwarding function is recovered to be normal.
When the receiving end of the first UART interface of the ARM processor of the second letter forwarding module and the receiving end of the third UART interface of the ARM processor of the second letter forwarding module simultaneously receive the sending signal instruction which accords with the TTL level, the ARM processor of the second letter forwarding module clears the audio signal received by the receiving end of the second UART interface, and the ARM processor of the second letter forwarding module clears the audio signal received by the receiving end of the fourth UART interface until only one of the receiving end of the first UART interface of the ARM processor of the second letter forwarding module and the receiving end of the third UART interface of the ARM processor of the second letter forwarding module receives the sending signal instruction, the corresponding audio signal clearing process is stopped, and the letter forwarding function is recovered to be normal.
In the embodiment of the invention, the four groups of UART ports corresponding to each letter forwarding module have different functions, and for the transmission direction from the first letter forwarding module to the second letter forwarding module, the functions realized by the receiving end of the second UART interface, the transmitting end of the fourth UART interface, the receiving end of the first UART interface and the transmitting end of the third UART interface of the ARM processor of each letter forwarding module are just opposite to the functions realized by the corresponding UART ports in the transmission direction from the second letter forwarding module to the first letter forwarding module; the same letter transfer module can simultaneously meet the application in two directions, and the two letter transfer modules can be used interchangeably, so that the application flexibility is enhanced. Therefore, the invention can realize automatic execution, direction control, conflict detection and function recovery of the transfer.
In the embodiment of the invention, the ARM processor mainly finishes the judgment and the processing of the instruction for controlling the data transmission, the caching, the detection, the classification, the conversion and the like of the data, and the judgment and the processing are finished through the second UART interface and the fourth UART interface. The judgment and processing of the command for controlling the transceiving conversion are carried out by carrying out conflict detection on 'simultaneous transmission' to control the transmission of the transceiving data, and the judgment and processing are finished through the first UART interface and the third UART interface. And the four UART interfaces of each ARM processor work cooperatively and do not influence each other.
In the embodiment of the invention, the ARM processor of each message forwarding module is electrically connected with a light emitting diode for marking the working state of the ARM processor. Specifically, a sending end and a receiving end of the first UART interface of the ARM processor of each letter forwarding module are respectively electrically connected with a light emitting diode, the light emitting diodes are used for indicating the state of the letter forwarding device when receiving or sending data in real time, and when the sending end of the first UART interface of the ARM processor of each letter forwarding module receives a signal sending instruction, the corresponding light emitting diodes are lighted. When the receiving end of the first UART interface of the ARM processor of each signal conversion module receives the signal receiving instruction, the corresponding light emitting diode is lighted.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (3)
1. A letter transfer device suitable for short-wave radio station communication, characterized by comprising: the system comprises a first communication module, a second communication module, a twisted-pair line, a first short-wave radio station and a fourth short-wave radio station, wherein the first short-wave radio station and the second short-wave radio station form two-way wireless communication connection, and the third short-wave radio station and the fourth short-wave radio station form two-way wireless communication connection; the second short wave radio station has an audio signal output and an audio signal input, and the third short wave radio station has an audio signal output and an audio signal input; the first communication module is respectively and electrically connected with an audio signal output end and an audio signal input end of a second short-wave radio station, and the second communication module is respectively and electrically connected with an audio signal output end and an audio signal input end of a third short-wave radio station;
each signal forwarding module comprises a modulation and demodulation module and an ARM processor, each modulation and demodulation module comprises a demodulator and a modulator, the modulator of each modulation and demodulation module is provided with a sending end and a receiving end, the demodulator of each modulation and demodulation module is provided with a sending end and a receiving end, and the ARM processor is provided with a first UART interface to a fourth UART interface; the receiving end of the second UART interface of the ARM processor of each letter forwarding module is electrically connected with the audio signal output end of the corresponding short-wave radio station, the ARM processor of each letter forwarding module is used for transmitting a signal from the receiving end of the second UART interface to the transmitting end of a fourth UART interface, and the transmitting end of the fourth UART interface of the ARM processor of each letter forwarding module is electrically connected with the receiving end of the modulator of the corresponding modulation and demodulation module; the transmitting end of the demodulator of each modulation and demodulation module is electrically connected with the receiving end of the fourth UART interface of the corresponding ARM processor, the ARM processor of each letter forwarding module is used for transmitting a signal from the receiving end of the fourth UART interface to the transmitting end of the second UART interface, and the transmitting end of the second UART interface of the ARM processor of each letter forwarding module is electrically connected with the audio signal input end of the corresponding short-wave radio station;
the transmitting end of the modulator of the modulation and demodulation module of the first relay module is electrically connected with the receiving end of the demodulator of the modulation and demodulation module of the second relay module through a twisted pair, and the receiving end of the demodulator of the modulation and demodulation module of the first relay module is electrically connected with the transmitting end of the modulator of the modulation and demodulation module of the second relay module through a twisted pair;
each letter forwarding module is also provided with an audio processing circuit, and the audio processing circuit of the first letter forwarding module is connected in series between the audio signal output end of the second short-wave radio station and the receiving end of the second UART interface of the ARM processor of the first letter forwarding module, and is connected in series between the audio signal input end of the second short-wave radio station and the transmitting end of the second UART interface of the ARM processor of the first letter forwarding module; the audio processing circuit of the first communication module is used for processing the audio signal output by the second short-wave radio station and processing the audio signal output by the ARM processor of the first communication module;
each transfer module also comprises a level conversion circuit, and the level conversion circuit is used for realizing the mutual conversion between the RS-232 level and the TTL level;
the second short-wave radio station is used for outputting SLIP protocol data packets which accord with RS-232 level when audio signals are output outwards, and the SLIP protocol data packets which accord with RS-232 level and are output by the second short-wave radio station comprise sending signal instructions; the level conversion circuit of the first communication module is used for receiving SLIP protocol data packets output by the second short-wave radio station, converting the SLIP protocol data packets conforming to the RS-232 level into SLIP protocol data packets conforming to the TTL level, and sending the SLIP protocol data packets conforming to the TTL level to the receiving end of the first UART interface of the ARM processor of the first communication module; the ARM processor of the first communication module is used for extracting a sending signal instruction which accords with TTL level from a SLIP protocol data packet received by a receiving end of a first UART interface of the ARM processor; the ARM processor of the first transfer module is used for sending a signal sending instruction which accords with TTL level to a sending end of a third UART interface of the ARM processor of the first transfer module, and the sending end of the third UART interface of the ARM processor of the first transfer module is electrically connected with a receiving end of a modulator of a modulation and demodulation module of the first transfer module; the modulator of the modulation and demodulation module of the first relay module is used for modulating the received sending signal instruction which accords with the TTL level, and sending the modulated sending signal instruction which accords with the TTL level to the demodulator of the modulation and demodulation module of the second relay module; the ARM processor of the second signal transferring module is used for generating a received signal instruction which accords with the TTL level according to a demodulated sent signal instruction which accords with the TTL level and is received by a receiving end of a third UART interface of the ARM processor; the ARM processor of the second letter forwarding module is used for sending a received signal instruction meeting the TTL level to a level conversion circuit of the second letter forwarding module through a sending end of a first UART interface of the ARM processor, the level conversion circuit of the second letter forwarding module is used for converting the received signal instruction meeting the TTL level into a received signal instruction meeting the RS-232 level, and the level conversion circuit of the second letter forwarding module is used for sending the received signal instruction meeting the RS-232 level to a third short-wave radio station; the third short wave radio station is used for receiving the demodulated audio signal from the sending end of the demodulator of the modulation and demodulation module of the second message forwarding module according to the received signal instruction;
the third short-wave radio station is used for outputting SLIP protocol data packets which accord with RS-232 level when audio signals are output outwards, and the SLIP protocol data packets which accord with RS-232 level and are output by the third short-wave radio station comprise sending signal instructions; the level conversion circuit of the second letter conversion module is used for receiving SLIP protocol data packets output by a third shortwave radio station, converting the SLIP protocol data packets conforming to the RS-232 level into SLIP protocol data packets conforming to the TTL level, and sending the SLIP protocol data packets conforming to the TTL level to the receiving end of the first UART interface of the ARM processor of the second letter conversion module; the ARM processor of the second message forwarding module is used for extracting a sending signal instruction which accords with TTL level from a SLIP protocol data packet received by a receiving end of the first UART interface; the ARM processor of the second letter forwarding module is used for sending a signal sending instruction which accords with the TTL level to a sending end of a third UART interface of the ARM processor of the second letter forwarding module, and the sending end of the third UART interface of the ARM processor of the second letter forwarding module is electrically connected with a receiving end of a modulator of a modulation and demodulation module of the second letter forwarding module; the modulator of the modulation and demodulation module of the second transfer module is used for modulating the received sending signal instruction which accords with the TTL level, and sending the modulated sending signal instruction which accords with the TTL level to the demodulator of the modulation and demodulation module of the first transfer module; the ARM processor of the first communication module is used for generating a received signal instruction which accords with the TTL level according to a demodulated sent signal instruction which accords with the TTL level and is received by a receiving end of a third UART interface of the ARM processor; the ARM processor of the first transfer module is used for sending a received signal instruction meeting the TTL level to a level conversion circuit of the first transfer module through a sending end of a first UART interface of the ARM processor, the level conversion circuit of the first transfer module is used for converting the received signal instruction meeting the TTL level into a received signal instruction meeting the RS-232 level, and the level conversion circuit of the first transfer module is used for sending the received signal instruction meeting the RS-232 level to a second short-wave radio station; the second short wave radio station is used for receiving the demodulated audio signal from the sending end of the demodulator of the modulation and demodulation module of the first signal forwarding module according to the received signal instruction;
and the ARM processor of each message forwarding module is electrically connected with a light-emitting diode for marking the working state of the message forwarding module.
2. A letter forwarding method suitable for short-wave radio communication, based on claim 1, the letter forwarding device suitable for short-wave radio communication, characterized by comprising:
when the first short-wave radio station sends out a radio frequency signal, the second short-wave radio station receives the radio frequency signal from the first short-wave radio station, and the second short-wave radio station processes the received radio frequency signal and converts the received radio frequency signal into an audio signal; the second short wave radio station sends the audio signal to a receiving end of a second UART interface of an ARM processor of the first communication module, the ARM processor of the first communication module transmits the signal from the receiving end of the second UART interface to a sending end of a fourth UART interface, and the sending end of the fourth UART interface of the ARM processor of the first communication module sends the received signal to the receiving end of a modulator of a modulation and demodulation module of the first communication module; the modulator of the modulation and demodulation module of the first signal conversion module modulates the received signal and sends the modulated signal out through a sending end of the modulator and demodulation module; the transmitting end of the modulator of the modulation and demodulation module of the first signal conversion module transmits the received signal to the receiving end of the demodulator of the modulation and demodulation module of the second signal conversion module through a twisted pair;
the demodulator of the modulation and demodulation module of the second signal forwarding module demodulates the received signal and sends the demodulated audio signal to the sending end of the demodulator of the modulation and demodulation module of the second signal forwarding module; the transmitting end of the demodulator of the modulation and demodulation module of the second letter forwarding module transmits the received audio signal to the receiving end of the fourth UART interface of the ARM processor of the second letter forwarding module, the ARM processor of the second letter forwarding module transmits the audio signal from the receiving end of the fourth UART interface to the transmitting end of the second UART interface, and the transmitting end of the second UART interface of the ARM processor of the second letter forwarding module transmits the received audio signal to the audio signal input end of the third short-wave radio station; the third short-wave radio station converts the received audio signals into radio frequency signals and sends the radio frequency signals generated by conversion to the outside, and the fourth short-wave radio station receives the radio frequency signals from the third short-wave radio station;
when the fourth short-wave radio station sends out radio frequency signals, the third short-wave radio station receives the radio frequency signals from the fourth short-wave radio station, and the third short-wave radio station processes the received radio frequency signals and converts the received radio frequency signals into audio signals; the third short wave radio station sends the audio signal to a receiving end of a second UART interface of an ARM processor of the second letter transferring module, the ARM processor of the second letter transferring module transmits the signal from the receiving end of the second UART interface to a sending end of a fourth UART interface, and the sending end of the fourth UART interface of the ARM processor of the second letter transferring module sends the received signal to the receiving end of a modulator of a modulation and demodulation module of the second letter transferring module; the modulator of the modulation and demodulation module of the second signal transfer module modulates the received signal and sends the modulated signal out through the sending end of the modulator and demodulation module; the transmitting end of the modulator of the modulation and demodulation module of the second signal transferring module transmits the received signal to the receiving end of the demodulator of the modulation and demodulation module of the first signal transferring module through the twisted pair;
the demodulator of the modulation and demodulation module of the first communication module demodulates the received signal and sends the demodulated audio signal to the sending end of the demodulator of the modulation and demodulation module of the first communication module; the transmitting end of the demodulator of the modulation and demodulation module of the first communication module transmits the received audio signal to the receiving end of the fourth UART interface of the ARM processor of the first communication module, the ARM processor of the first communication module transmits the audio signal from the receiving end of the fourth UART interface to the transmitting end of the second UART interface, and the transmitting end of the second UART interface of the ARM processor of the first communication module transmits the received audio signal to the audio signal input end of the second short-wave radio station; the second short-wave radio station converts the received audio signals into radio frequency signals and transmits the radio frequency signals generated by conversion to the outside, and the first short-wave radio station receives the radio frequency signals from the third short-wave radio station.
3. The signal relaying method for short wave radio communication of claim 2, wherein when the receiving end of the first UART interface of the ARM processor of the first signal relaying module and the receiving end of the third UART interface of the ARM processor of the first signal relaying module simultaneously receive the signal transmitting command conforming to the TTL level, the ARM processor of the first signal relaying module clears the audio signal received by the receiving end of the second UART interface, and the ARM processor of the first signal relaying module clears the audio signal received by the receiving end of the fourth UART interface;
when the receiving end of the first UART interface of the ARM processor of the second letter forwarding module and the receiving end of the third UART interface of the ARM processor of the second letter forwarding module simultaneously receive a signal sending instruction which accords with the TTL level, the ARM processor of the second letter forwarding module clears the audio signal received by the receiving end of the second UART interface, and the ARM processor of the second letter forwarding module clears the audio signal received by the receiving end of the fourth UART interface.
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| CN106162525A (en) * | 2016-06-28 | 2016-11-23 | 施玥 | Shortwave MANET chain-circuit system |
| CN109462530B (en) * | 2018-10-23 | 2021-05-18 | 中电科航空电子有限公司 | Airplane digital audio transmission method based on RS422 bus and Slip protocol |
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