CN201388238Y - Dual network fully switched wireless communication system - Google Patents

Abstract

The utility model provides a dual-network full-switching wireless communication system, which is characterized in that: the communication system includes at least two communication hosts, and each two communication hosts are connected together through two parallel switching networks to form a communication device; Each communication host contains at least one dual-network switching unit connected to the switching network; the dual-network switching unit mainly includes a wireless board, an external line board, a seat board and two switching boards; the wireless board and the external line board pass through two parallel communication networks The data lines are connected to two parallel switching boards, and the two switching boards are jointly connected to the seat board; the two switching boards are simultaneously connected to two parallel switching networks. The utility model has simple and reasonable equipment and strong practicability, and is more suitable for application in the field of civil aviation.

Description

Dual network fully switched wireless communication system

Technical field:

The utility model provides a wireless communication system applied to civil aviation systems, in particular to a dual-network full-switching wireless communication system.

Background technique:

The wireless communication system is the most important link in the production and operation of civil aviation. For a long time, China's main ground-air communication equipment has relied on imports. Single and many other problems; and the traditional wireless communication system, for ground-air communication, cannot realize local one-to-multipoint, and local and foreign one-to-multipoint communication, for example: in the past, the radio station was directly connected to the remote control box , to carry out wireless communication, and the remote control box forms a control seat. In this way, if wireless control with multiple parties is required, multiple remote control boxes need to be configured at one seat end. This makes the seat configuration extremely complicated, which brings great inconvenience to both use and maintenance. Great inconvenience. In addition, the communication system in the past is a single-line connection. Once the connection is interrupted, the entire system will be paralyzed, and the communication system in the past has poor compatibility and single function; If the central processing unit stops working, it will also cause the entire system to be paralyzed; and the aviation communication system is an essential system to maintain flight safety.

Invention content:

Purpose of the invention: This utility model provides a dual-network full-switching wireless communication system. Its purpose is to solve the problems of the previous communication systems, such as small capacity, complex seat configuration, easy damage and inconvenient maintenance due to single-line connection.

Technical solution: the utility model is realized through the following technical solutions:

A dual-network full-switching wireless communication system is characterized in that: the communication system includes at least two communication hosts, and each two communication hosts are connected together through two parallel switching networks to form a communication device; each communication host Contains at least one dual-network switching unit connected to the switching network; the dual-network switching unit mainly includes a wireless board, an external line board, a seat board and two switching boards; the wireless board and the external line board are connected to the Two parallel switching boards, the two switching boards are connected to the seat board; the two switching boards are connected to two parallel switching networks at the same time.

The dual network switching unit also includes a monitoring board, a GPS board, a voice board and a recording board; the monitoring board, the GPS board, the voice board and the recording board are connected to the two switching boards through two parallel communication network data lines.

All be provided with audio isolation converter, digital isolator, two network driver modules and independent CPU and FPGA on described wireless board, outside line board, seat board; Two network drivers are connected with CPU by circuit, and CPU is connected with CPU by circuit. FPGA connection, on the one hand, the FPGA is connected to the audio isolation converter through the digital-to-analog converter, and on the other hand, it is directly connected to the digital isolator; the audio isolation converter digital isolator is connected to the external device port, and the two network drive modules are connected through communication The network data cable is connected to the two switching boards.

The transmission media of the two parallel switching networks are optical fiber, coaxial cable, twisted pair, VLAN, VPN, protocol conversion ATS-QSIG, NO.7 and wireless bridge.

The switching board is provided with a plurality of interfaces connected to each functional board and connected to the full switching network, all interfaces are connected to the switching unit through an audio isolation converter and a digital isolator, and the switching unit is judged by the control and routing protocol module connection.

Digital isolators use optocouplers or relays.

Multiple dual-network switching unit arrays in the communication host are arranged in the housing; and wireless boards, external line boards, seat boards, monitoring boards, GPS boards, voice boards, recording boards and switching boards in each dual-network switching unit The boards are all plugged into the board slots in the casing, and the switching boards are plugged into both ends of the board slots.

The wireless board is connected to the VHF radio station when in use; the outside line board is connected to the local telephone or the program-controlled switchboard when in use; the seat board is connected to the user seat through the seat terminal board when in use.

Advantages and effects: the utility model provides a dual-network full-switching wireless communication system, which connects multiple communication hosts using two parallel full-switching networks to form an overall communication structure; and each communication host includes Multiple dual-network switching units, the information conversion and exchange between the entire system is based on each dual-network switching unit, and then multiple dual-network switching units are organically connected through two parallel full switching networks Together, form the system host; then distribute the system host at different control points to realize the information communication between the hosts; two parallel fully switched networks can choose many carriers for interconnection (such as: network cable, twisted pair, optical fiber , coaxial cable, etc.), and there are many mature and stable networking and routing solutions to choose from (such as: LAN VLAN networking, WAN VPN, DDN dedicated line, wireless bridge, etc.), which can provide 100M, 1000M switching speed, so While improving the information conversion rate of the whole system, the capacity of the system is greatly improved; and the structure of each dual-network switching unit in the system host is a wireless board, an external line board, a seat board, a monitoring board, a GPS board, and a voice board. 1. The recording board is connected to two switching boards through two parallel communication network data lines, the seat board is connected to the seat terminal board, and the seat terminal board is connected to the user seat to form a communication device. When the unit is in use, The wireless board 3 is connected with the external VHF very high frequency radio station, so that the external wireless communication system can communicate with the seat, so that the seat can communicate and control the external communication system wirelessly; and the wireless board can communicate with multiple external VHF very high frequency radio stations In this way, the purpose of multi-point wireless call control can be realized through the conversion between one seat, so that the seat configuration is extremely simple and reasonable; at the same time, because each dual-network switching unit corresponds to one seat, in this case, in each communication host There are multiple seats inside, so that the seats in the communication host can freely communicate with each other, and the multiple seats between the communication host and the communication host can also communicate freely.

In addition, there are other functional boards configured in the dual network switching unit, for example: the external line board is connected to the local telephone or the program-controlled switchboard to realize the connection between the system and the external wired telephone; the monitoring board is used to connect with the monitoring configuration terminal to monitor the security of the system and send an alarm signal; the GPS board is connected with an external clock source to realize clock synchronization; the voice board is used to store the voice information sent to each corresponding function board of the dual network switching unit; the recording board 12 is used for local recording of remote seats . In addition, on each functional board of the dual-network switching unit of the system, there are integrated two mutually isolated full-switching networks for redundant operation. The system adopts a decentralized control structure. There is no central processing unit in the entire communication host, and all functions All are controlled by the independent CPU and FPGA on each function board. The distributed control structure can limit the fault to the minimum range. The fault of any function board will not affect the normal operation of the whole system, which greatly improves the reliability. .

In addition, the utility model also has the following advantages:

Due to the adoption of the decentralized control structure and the dual-network parallel redundant working mode, the data exchange is unimpeded and the system runs stably. provided strong support;

After the analog-to-digital conversion of the corresponding function board, the external voice information is exchanged through the two networks in the format of data frames. The ratio of the designed broadband (10M) to the actual used broadband (128K) reaches 10:0.128, effectively improving the data quality. Exchange reliability and truly achieve non-blocking communication.

Multiple dual-network switching units (maximum 255, can be expanded to 1023 as required) form the communication host of the system through two parallel full-switching networks. Then through two parallel full-switching networks, multiple communication hosts in local or remote places are connected together to form a complete dual-network full-switching wireless communication system, which makes the resource utilization between different places more reasonable and the connection between regions closer. Control scheduling is safer and more reliable.

The utility model adopts two redundant parallel full-switching network architectures, and the two networks work in parallel, which can facilitate capacity expansion, make the use of local resources more reasonable, and make the connection between regions closer, so as to truly achieve non-blocking communication. , The capacity of this system exceeds the maximum capacity of similar international systems by more than 2 times.

Each functional board of the utility model is integrated with a fully redundant network to work in parallel, providing a data exchange capability of not less than 10Mpbs between any two functional boards, and exchanging between multiple units. With the rapid development of today's network technology, this system The communication host will have a very powerful expansion capability. Under such exchange capacity, the number of various interfaces such as seats, analog users, and digital users can be expanded almost unlimitedly. It can adopt rich networking solutions, and can realize inter-regional multi-platform full-featured networking, so that resource shared.

In addition, many imported products do not provide data conversion protocols and technologies, so it is very difficult to interconnect multiple systems. However, the utility model adopts different communication protocols, uses the self-developed communication protocol, can make the communication protocols between different communication hosts convert each other, and has strong compatibility with different products.

The utility model can be externally connected to various VHF, HF, differential turntables and wireless intercom equipment currently used in China, and the normal operation of these equipment is directly related to the safe production of civil aviation. Once the access equipment is damaged due to the internal failure of the system, the loss is immeasurable. Therefore, all the input and output ports of each function board of this system are completely isolated during design. All audio input and output signals (RX, TX and telephone signals) are isolated through audio isolation converters; digital signals (PTT, SQL, ALM) are isolated through photocouplers and relays. The fully isolated access method can ensure that even if a serious failure occurs in the system, it will not have any impact on the connected VHF and other equipment, effectively improving the overall reliability and security of the ground-to-air communication system.

The utility model also adopts an adaptive interface. When an external device is connected, the CPU and FPGA on each function board will automatically judge the polarity and level of the signal, and output a standard control signal for processing after internal polarity and level conversion. For the output signal of the system, each function board also performs intelligent processing to make the output signal meet the needs of the access equipment. This processing method can meet the grounding/dry contact/+5V/+12V/-48V of digital signals, etc., which greatly facilitates the connection of VHF devices with different protocols and improves the adaptability of the system.

The utility model adopts independent CPU decentralized control, and each function board has a high-performance 32-bit intelligent processor (CPU) NIOSII, which is used to process functions such as redundant communication protocols, audio collection and audio synthesis. During the entire application and maintenance process, the structure of the distributed control system can limit the failure to a minimum range, and the failure of any function board will not affect the normal operation of the entire system. The reliability of the system has been further improved compared with the system using the traditional core host control mode, and the operation is stable, which provides strong support for ensuring flight safety.

The utility model adopts the full switching network technology, and has obvious advantages compared with the traditional PCM switching technology. The comparison of the two technologies is as follows:

PCM switching technology is a digital signal switching method before the network technology is perfected. It is similar to the switching method of analog switch matrix conversion, and the switching capacity has limitations; the whole network switching technology is a new type of digital signal switching technology. Born out of the rapid development of technology, it has the characteristics of large switching capacity, large transmission bandwidth, and flexible control, especially the full switching network structure using fault-tolerant coding technology, which has the characteristics of accurate and timely data transmission during data exchange. It is more in line with the special requirements of the civil aviation industry for the safety and reliability of communication systems.

PCM switching technology uses a control chip to control the switching on or off of the switching chip channel. The data of the full switching network technology is transmitted in frame format, and the head of each data frame has a definite destination address, and the switching chip performs data frame exchange according to the destination address. The information processing ability of PCM switching depends on the speed of the processor, while the full switching network distributes all signaling processing to each port and does not depend on the speed of the processor.

PCM switching needs a synchronous clock. If the synchronous clock is lost, the PCM switching will be paralyzed, but the full switching network does not need a synchronous clock. Compared with PCM switching technology, full switching network technology can provide more networking methods.

in terms of use and maintenance. After the utility model is adopted, the radio station is connected to the wireless board, and the seats in the communication host are directly connected to the wireless board through the switching board, so the use and maintenance are relatively simple and convenient, and the safety is also greatly improved, which effectively guarantees the flight safety .

In addition, the board card of the utility model can be hot swapped. Any board (including the switching board) can be hot-swapped in the power-on state, which is convenient for users to maintain without affecting the use.

The utility model has a comprehensive operation supervision and control platform. It can detect any data information in the system, intelligently judge the fault and have sound and light alarm.

remote maintenance. The system provides the maintenance function of remote dialing. The maintenance personnel of the manufacturer can connect to the system through dialing with the permission of the user to help the user in fault diagnosis and information configuration.

Fully redundant design of the switching system. It enables the user to turn off or unplug any switching board for switching during the use of the system without affecting the normal use of the system.

The utility model can seamlessly switch between the active and standby VHF radio stations, that is to say, when two active and standby radio stations of the same frequency are configured on the same seat, if the active radio station fails (ALARM alarm), The system will automatically switch to the standby radio station for sending and receiving. Even if the user is in the middle of a call and the main machine fails, it will switch to the standby machine without interruption. This action is almost imperceptible to the receiver. The user can also distinguish between the main and standby machines by adjusting the volume.

The full switching network technology of the utility model can also adopt a self-developed communication protocol, and interconnect with intercom equipment using other communication protocols through a protocol conversion unit.

The utility model has simple and reasonable equipment and strong practicability, and is more suitable for application in the field of civil aviation.

Description of drawings:

Fig. 1 shows the overall structure schematic diagram of the utility model;

Fig. 2 shows the structural representation of the utility model communication host computer;

Fig. 3 shows the schematic diagram of the dual network switching unit of the present utility model;

Fig. 4 represents the schematic diagram of the utility model exchange medium;

Fig. 5 represents the structural block diagram of the utility model wireless board;

Fig. 6 shows the circuit board diagram of the utility model wireless board;

Fig. 7 represents the circuit diagram with the audio isolation converter of the utility model wireless board;

Fig. 8 shows the overall structural schematic diagram of the communication host of the present invention;

Fig. 9 shows a structural principle block diagram of the exchange board of the present invention.

Detailed ways:

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Figure 1, the utility model provides a dual-network full-switching wireless communication system, the communication system includes at least two communication hosts 1, and each two communication hosts 1 pass through two external parallel full-switching networks 111 connected to form a complete communication device; in this way, free communication through two full switching networks 111 can be realized between every two communication hosts 1; each communication host 1 contains at least one dual network switching unit 2; if multiple dual The network switching unit 2 is also connected together through two full switching networks 111 between multiple dual network switching units 2; the dual network switching unit 2 mainly includes a wireless board 3, an external line board 5, a seat board 6, and a seat terminal board 7 and two switching boards 8; as shown in Figures 2 and 3, the wireless board 3 and the outside line board 5 are connected to the two switching boards 8 through two parallel communication network data lines, and the two switching boards 8 are connected to the seat board 6 The seat board 6 is connected to the seat terminal board 7; two switching boards 8 are connected with two external full switching networks 111 at the same time; when in use, the wireless board 3 is connected with a plurality of external VHF very high frequency radio stations 17 through the external equipment port, so that The seat realizes the connection and control with the external VHF very high frequency radio station 17; the outside line board is also connected with the local telephone or the program-controlled switchboard through the external equipment port, and the seat terminal board 7 is connected with the user seat 15, so that in each dual-network exchange unit It will realize that one seat can control one or more points wirelessly, and control other multiple functions; and because there are multiple dual-network switching units 2 in the communication host 1, so that the multiple communication units in the same communication host 1 Free information exchange can be realized between the 15 user seats and the line equipment connected to the inner line board.

And as shown in Figure 2, described double network switching unit 2 also includes monitoring board 9, GPS board 10, voice board 11 and recording board 12; Monitoring board 9, GPS board 10, voice board 11 and recording board 12 pass The two internal communication networks 222 are connected with two switching boards 8; when in use, the monitoring board 9 is used to connect with the monitoring configuration terminal; the GPS board 10 is connected with an external clock source; and the voice board 11 is used for storing two-way The voice information sent by each corresponding functional board of the network switching unit 2; the recording board 12 is used for local recording of remote seats; and the switching board 8 is provided with a plurality of ports for corresponding connection with each functional board.

Fig. 9 shows a simple block diagram of the structure and principle of the switching board 8. After digital and audio isolation, the information in the switching board 8 enters the switching unit and the control and land routing protocol judgment module for processing, and then sends it out. That is to say that the exchange board 8 is made up of a plurality of ports connected with each function board, exchange unit and control and land routing protocol judgment module, and each port is connected with the exchange unit through an audio isolation converter and a digital isolator, and the exchange unit is connected with the control unit. And the land is connected with the protocol judging module.

Audio isolation converters, digital isolators, and two network Driver module and independent CPU 18 and FPGA 19; As shown in Figure 5 and 6, take wireless board 3 as example, audio frequency isolation converter, digital isolator, two network driver modules and independent CPU 18 and FPGA 19 are all set On the printed circuit board, the network driver module is connected to two parallel communication network data lines inside, and then connected to the switch board 8; the two network drivers 20 are connected to the CPU through a circuit, and the CPU is connected to the FPGA through a circuit, and the CPU and the FPGA form a Control unit; the FPGA is connected with the audio isolation converter 22 through two digital-to-analog converters with opposite conversion directions on the one hand, and is connected with the digital isolator on the other hand, and the audio isolation converter and the digital isolator are connected with the external device port; and Digital isolators can be optocouplers or relays. FPGA is Field Programmable Gate Array.

As shown in Figure 8, a plurality of dual-network switching units 2 arrays in the communication host 1 are arranged in a housing 14; , monitoring board 9, GPS board 10, voice board 11, switching board 8 and recording board 12 are all plugged in the board slot 24 of housing 14, and switching board 8 is plugged in the two ends of board slot 24. Various external devices including user seats 15 and VHF radios 17 are directly connected to function boards corresponding to each dual-network switching unit 2 in the housing 14 through lines.

As shown in Figure 3, it is a simple block diagram of the connection form of the present utility model, the connection situation of each function board and power supply has been shown in the figure, the connection situation of each function board and power supply is the same as the existing known circuit board, no longer here repeat.

Because this system can be externally connected to various VHF, HF, differential turntables, wireless intercom and various ground wired communication equipment currently used in China, and the normal operation of these equipment is directly related to the safety of civil aviation production. Once the access equipment is damaged due to the internal failure of the system, the loss is immeasurable. Therefore, all the input and output ports of the system are partially isolated when designing each function board. All audio input and output signals (RX, TX, and telephone signals) are isolated through audio isolation converters; digital signals (PTT, SQL, ALM) are isolated through digital isolators, that is, photocouplers or relays. The fully isolated access method can ensure that even if a serious failure occurs in the system, it will not have any impact on the connected VHF and other equipment, effectively improving the overall reliability and security of the ground-to-air communication system. When the system is in use, the communication host can be set in different places to transmit information to each other.

In addition, as shown in FIGS. 5 , 6 and 7 , it is the construction principle of the inner cable board 4 .

The interface of the utility model adopts an adaptive type. When an external device is connected, the CPU and FPGA on each function board will automatically judge the polarity and level of the signal, and output a standard control signal for processing after internal polarity and level conversion. For the output signal of the system, each function board also performs intelligent processing through the AD converter, so that the output signal meets the needs of the access device. This processing method can meet the grounding/dry contact/+5V/+12V/-48V of digital signals, etc., which greatly facilitates the connection of VHF devices with different protocols and improves the adaptability of the system.

When the utility model is in use, information is collected through each functional board, and then through the switching board 8 and two parallel full switching networks 111, the communication between the dual-network switching units 2 and between the local communication host 1 and the remote communication host 1 is realized. Information exchange, so as to realize inter-regional multi-platform full-featured networking and resource sharing.

The platform architecture of the utility model adopts the full switching network technology, which has obvious advantages compared with the traditional PCM switching technology. The PCM circuit switching hardware design and the full switching network hardware design are shown in the figure.

The comparison of the two technologies is as follows:

PCM switching technology is a digital signal switching method before the network technology is perfected. It is similar to the switching method of analog switch matrix conversion, and the switching capacity has limitations; the whole network switching technology is a new type of digital signal switching technology. Born out of the rapid development of technology, it has the characteristics of large switching capacity, large transmission bandwidth, and flexible control, especially the full switching network structure using fault-tolerant coding technology, which has the characteristics of accurate and timely data transmission during data exchange. It is more in line with the special requirements of the civil aviation industry for the safety and reliability of communication systems.

PCM switching technology uses a control chip to control the switching on or off of the switching chip channel. The data of the full switching network technology is transmitted in frame format, and the head of each data frame has a definite destination address, and the switching chip performs data frame exchange according to the destination address. The information processing ability of PCM switching depends on the speed of the processor, while the full switching network distributes all signaling processing to each port and does not depend on the speed of the processor. PCM switching needs a synchronous clock. If the synchronous clock is lost, the PCM switching will be paralyzed, but the full switching network does not need a synchronous clock. Compared with PCM switching technology, full switching network technology can provide more networking methods.

After adopting the utility model, the user seat 15 is also directly connected to the wireless board 3 in the communication host 1 through the exchange board 8, so that the radio station 17 is directly connected to the user seat 15; its use and maintenance are all relatively simple and convenient, and the safety also follows It has been greatly improved and has effectively guaranteed flight safety.

On each function board, there are integrated two mutually isolated full-switching networks for redundant operation.

When the utility model is in use, the corresponding function boards of each dual network switching unit 2 will convert the external voice information through the analog-to-digital conversion, and then exchange the data in the form of a data frame through two communication network data lines, and design broadband (10M ) and the actual broadband (128K) ratio reaches 10:0.128, which effectively improves the reliability of data exchange and truly achieves non-blocking communication.

The utility model adopts a redundant full-switching network architecture, dual networks work in parallel, can easily expand capacity, and make resource utilization more reasonable, inter-regional connections closer, and truly achieve non-blocking communication. At present, the capacity of this system exceeds The maximum capacity of similar international systems is more than double.

The function boards of the utility model are all integrated with a fully redundant network to work in parallel, providing a data exchange capability of not less than 10Mpbs between any two function boards, exchanging between multiple communication hosts 1, and providing exchange rates of 100M and 1000M, With the rapid development of today's network technology, this system will have a very powerful capacity expansion. Under such a switching capability, the number of various interfaces such as seats, analog users, and digital users can be expanded almost unlimitedly.

With the construction of regional management in the field of air traffic control, the extension of airline bases, and the integration of airport group companies, the demand for regional networking for voice dispatch management is becoming more and more urgent. The research and development of this system has successfully solved this problem. The networking solution, the remote seat can use the transmission medium to realize the networking with the remote intercom system through the switching network. As shown in Figure 4, transmission media include optical fiber, coaxial cable, twisted pair, VLAN, VPN, protocol conversion ATS-QSIG, NO.7 and wireless bridge.

Since different communication hosts use different communication protocols, and many imported products do not provide data conversion protocols and technologies, it is very difficult to interconnect multiple systems. The communication protocol independently developed by this system can make the communication protocols between different platforms convert each other, and has strong compatibility with different products.

The utility model adopts independent CPU decentralized control, and each function board has a high-performance 32-bit intelligent processor (CPU) NIOSII, which is used to process functions such as redundant communication protocols, audio collection and audio synthesis. During the entire application and maintenance process, the structure of the distributed control system can limit the failure to a minimum range, and the failure of any function board will not affect the normal operation of the entire system. The reliability of the system has been further improved compared with the system using the traditional core host control mode, and the operation is stable, which provides strong support for ensuring flight safety.

The utility model also has high efficiency and maintainability, which is mainly reflected in the following points:

1. The board is hot-swappable. Any board (including the switching board) can be hot-swapped in the power-on state, which is convenient for users to maintain without affecting the use.

2. Comprehensive operation supervision and control platform. It can detect any data information in the system, intelligently judge the fault and have sound and light alarm.

3. Remote maintenance. The system provides the maintenance function of remote dialing. The maintenance personnel of the manufacturer can connect to the system through dialing with the permission of the user to help the user in fault diagnosis and information configuration.

4. Fully redundant design of the switching system. It enables the user to turn off or unplug any switching board for switching during the use of the system without affecting the normal use of the system.

This utility model can also realize the seamless switching of the active and standby VHF radio stations, for example: when two active and standby radio stations of the same frequency are configured on the same user seat 15, if the active radio station fails (ALARM alarm), The system will automatically switch to the standby radio station for sending and receiving. Even if the user is in the middle of a call and the main machine fails, it will switch to the standby machine without interruption. This action is almost imperceptible to the receiver. The user can also distinguish between the main and standby machines by adjusting the volume.

With the dual-network full-switching wireless communication system of the present invention, different communication hosts 1 can be interconnected through many carriers (such as: network cable, twisted pair, optical fiber, coaxial cable, etc.), and there are many mature and stable Various networking and routing schemes can be selected (such as: LAN VLAN networking, WAN VPN, DDN dedicated line, wireless bridge, etc.), and self-developed communication protocols can also be used to communicate with intercom devices using other communication protocols through the protocol conversion unit interconnected.

The utility model has simple and reasonable equipment and strong practicability, and is more suitable for application in the field of civil aviation.

Claims (8)

1. A dual-network fully switched wireless communication system, characterized in that: the communication system includes at least two communication hosts (1), and two parallel switching networks (111) are passed between each two communication hosts (1) connected together to form a communication device; each communication host (1) includes at least one dual network switching unit (2) connected to the switching network (111); the dual network switching unit (2) mainly includes a wireless board (3), an external board (5), the seat board (6) and two switching boards (8); the wireless board (3) and the external line board (5) are connected to two parallel switching boards (8) through two parallel communication network data lines , the two switching boards (8) are jointly connected to the seat board (6); the two switching boards (8) are simultaneously connected to two parallel switching networks (111). 2. The dual-network full-switching wireless communication system according to claim 1, characterized in that: said dual-network switching unit (2) also includes a monitoring board (9), a GPS board (10), a voice board (11 ) and recording board (12); monitoring board (9), GPS board (10), voice board (11) and recording board (12) are connected with two switching boards (8) by two parallel communication network data lines. 3. The dual-network full-switching wireless communication system according to claim 1, characterized in that: audio isolation converters, Digital isolator, two network driver modules and independent CPU and FPGA; two network drivers (14) are connected with CPU through circuit, CPU is connected with FPGA through circuit, and FPGA is connected with audio frequency isolation converter through digital-to-analog converter on the one hand , and on the other hand, directly connected to the digital isolator; the digital isolator of the audio isolation converter is connected to the port of the external device, and the two network drive modules are connected to the two switching boards (8) through the communication network data lines. 4. A kind of dual-network fully switched wireless communication system according to claim 1, characterized in that: the transmission media of the two parallel switching networks (111) are optical fiber, coaxial cable, twisted pair, VLAN, VPN, Protocol conversion ATS-QSIG, NO.7 and wireless bridge. 5. The dual-network full-switch wireless communication system according to claim 2, characterized in that: the switch board is provided with a plurality of interfaces connected to each function board and interfaces connected to the full-switch network (111), all The interfaces are all connected to the switching unit through the audio isolation converter and the digital isolator, and the switching unit is connected to the control and routing protocol judgment module. 6. A dual-network full-switching network communication system according to claim 3 or 5, wherein the digital isolator adopts a photocoupler or a relay. 7. The dual-network full-switching wireless communication system according to claim 2, characterized in that: the plurality of dual-network switching units (2) arrays in the communication host (1) are arranged in the housing (14); And the wireless board (3), outside line board (5), seat board (6), monitoring board (9), GPS board (10), voice board (11), recording board in each dual network switching unit (2) (12) and switching board (8) are all plugged in the board slot (15) in the casing (14), and switching board (8) is plugged in the two ends of board slot (15). 8. The dual-network fully switched wireless communication system according to claim 1, characterized in that: the wireless board (3) is connected to the VHF radio when in use; the outside line board (5) is connected to the local telephone or the program-controlled exchange Connection; the seat plate (6) is connected with the user seat through the seat terminal plate (7) when in use.

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