A method and system for enhancing air traffic control voice communication

Abstract

The application discloses an air traffic control voice communication method and system, the method comprises the following steps: obtaining voice information of an air traffic control voice sending end, performing hidden conversion on the voice information to add a digital signature and obtain a voice data packet; transmitting the voice data packet to an air traffic control voice receiving end through an IP packet network and performing recovery conversion to extract the digital signature and recover the voice information; identifying the communication type of the voice information according to the digital signature, and selecting a corresponding communication channel to forward the voice information according to the communication type. The application adds a digital signature to the voice information to realize information hiding, realizes ground-ground voice communication and ground-air voice communication forwarding according to different channels, saves air-ground voice communication frequency resources, reduces interference between multiple subjects in the same frequency band, changes the communication between ground controllers into a point-to-point visible mode, enhances the privacy and security of voice communication, and supports more communication channels.

Description

Technical Field

[0001] This invention relates to the field of air traffic control voice communication technology, and specifically to a method and system for enhancing air traffic control voice communication. Background Technology

[0002] In the aviation system, the air traffic control center is a key institution responsible for issuing various instructions to aircraft to ensure flight safety. Voice communication is a convenient, fast, and efficient method of communication for air traffic control centers, and it is also an important one. Based on the operational needs of the air traffic control center, the voice communication system should meet the needs of controllers for internal, external, and wireless communication, enabling them to complete daily aircraft command and dispatch.

[0003] The civil aviation air traffic control voice communication system is an important component and infrastructure of the civil aviation air traffic control information system, providing reliable support for air traffic control services. In order to enable aircraft to communicate by voice, the VHF band is the most commonly used band in civil aviation. Its available frequency range is between 118MHz and 137MHz. The actual frequency band starts from 108MHz, but the first 10MHz is reserved for non-voice operations. In many countries, the channel spacing is 25kHz, while Europe uses an 8.33kHz channel, which shows that the frequency channel range is relatively narrow.

[0004] The air traffic control voice communication system comprises two main parts: ground-to-ground and ground-to-air communication. Voice communication includes VHF, HF, and satellite voice. Ground-to-ground and ground-to-air radio communication frequencies follow agreed-upon rules; the frequencies required for a given airspace are pre-defined, and monitoring on several frequencies is guaranteed regardless of the flight passing through that airspace. To effectively centralize and integrate various communication resources and facilitate accurate and efficient air traffic control command, coordination, and information dissemination by air traffic controllers, the Civil Air Traffic Control Voice Communication Exchange System (VCSS, i.e., the intercom system) was developed. The intercom system integrates, configures, and flexibly schedules wired and wireless communication resources to achieve accurate, reliable, and efficient information exchange between various voice information types. However, traditional air traffic control voice communication technology has the following drawbacks: the air traffic control intercom system currently does not distinguish between ground-to-ground and air-to-ground communication types. Both ground-to-ground and air-to-ground voice communications use a unified method and communicate according to the established VHF frequency rules of civil aviation. Given the already scarce spectrum resources, the increase in flight traffic leads to a decline in call quality, which is prone to call congestion, strong noise interference, and makes it difficult for controllers and pilots to identify the specific person they are talking to. They need to spend a lot of effort to identify the content of the voice, and there is also the problem of obtaining incorrect call instructions, which affects air traffic control command.

[0005] The reasons for the above shortcomings are: the voice communication technology is simple, mainly VHF communication, and the communication spectrum bandwidth is narrow, with insufficient available channels. In the absence of the ability to distinguish between ground-to-ground and air-to-ground channel resources, the voice communication aliasing within the same frequency is too high, making it difficult for controllers and pilots to identify their own relevant instructions. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a method and system for enhancing air traffic control voice communication.

[0007] Firstly, an enhanced air traffic control voice communication method includes:

[0008] The voice information from the air traffic control voice transmitter is obtained, and the voice information is hidden and converted to add a digital signature and obtain a voice data packet.

[0009] The voice data packets are transmitted to the air traffic control voice receiver via an IP packet network and then restored and converted to extract the digital signature and restore the voice information.

[0010] The communication type of the voice information is identified based on the digital signature, and the corresponding communication channel is selected based on the communication type to forward the voice information.

[0011] Furthermore, the step of obtaining the voice information from the air traffic control voice transmitter, performing a hidden transformation on the voice information to add a digital signature and obtain a voice data packet specifically involves:

[0012] Acquire voice information from the air traffic control voice transmitter and identify whether the voice information is a digital signal. If not, perform A / D conversion on the voice information to convert the voice information into digital voice information.

[0013] A digital signature is added to the digital voice information, and it is compressed and encoded for hidden conversion to obtain a voice data frame;

[0014] Add header information to the voice data frame to form a voice data packet.

[0015] Furthermore, the step of transmitting the voice data packets to the air traffic control voice receiver via the IP packet network and performing restoration conversion to extract the digital signature and restore the voice information specifically involves:

[0016] The voice data packets are transmitted to the air traffic control voice receiver via different network IP routes through the IP packet network.

[0017] The voice data packets received by the air traffic control voice receiver are placed into a buffer, and the voice data packets are arranged in the order of reception.

[0018] The voice data packets in the buffer are decompressed and decoded, and the digital signature is extracted for restoration conversion to recover the digital voice information.

[0019] Furthermore, the step of identifying the communication type of the voice information based on the digital signature, and selecting the corresponding communication channel to forward the voice information based on the communication type, specifically involves:

[0020] The communication type of the digital voice information is identified based on the digital signature, and the communication type includes ground-to-ground voice communication and ground-to-air voice communication.

[0021] If the communication type is ground-to-air voice communication, the digital voice information is converted from digital to analog voice information, and the corresponding ground-to-air voice communication channel is selected to forward the analog voice communication.

[0022] If the communication type is ground-to-ground voice communication, then the corresponding ground-to-ground voice communication channel is selected to forward the digital voice communication.

[0023] Furthermore, the step of selecting a corresponding ground-to-air voice communication channel to forward the analog voice communication specifically involves:

[0024] If the communication type is ground-to-air voice communication, then a VHF link is selected as the communication channel to forward the analog voice.

[0025] Furthermore, the step of selecting a corresponding ground-to-ground voice communication channel to forward the digital voice communication specifically involves:

[0026] If the communication type is ground-to-ground voice communication, then an IP packet network link is selected as the communication channel to forward the digital voice communication;

[0027] When the IP packet network link fails, the VHF link will be used as an emergency communication channel for the ground-to-ground voice communication.

[0028] Secondly, an enhanced air traffic control voice communication system includes a voice input / output unit, a voice processing unit, and a voice communication unit.

[0029] The voice input / output unit is used for receiving and transmitting voice information between the air traffic control voice transmitter and the air traffic control voice receiver.

[0030] The voice communication unit is used to convert the voice information between digital signals and analog signals;

[0031] The speech processing unit is used to perform hidden conversion and restored conversion on the speech information;

[0032] The voice communication unit is also used to identify the communication type of the voice information, and select the corresponding communication channel based on the communication type to forward the voice information.

[0033] Furthermore, the voice communication unit includes a Radio gateway device, and the voice processing unit includes a digital signature server and a central voice server;

[0034] The voice input / output unit acquires the voice information from the air traffic control voice transmitter and identifies whether the voice information is a digital signal. If not, the Radio gateway device performs A / D conversion on the voice information to convert the voice information into digital voice information.

[0035] The digital signature server adds a digital signature to the digital voice information, and the central voice server compresses and encodes the digital voice information to perform hidden conversion, thereby obtaining a voice data frame.

[0036] The central voice server adds header information to the voice data frames to form voice data packets.

[0037] Furthermore,

[0038] The voice input / output unit transmits the voice data packets to the air traffic control voice receiver via different network IP routes through an IP packet network.

[0039] The central voice server puts the voice data packets received by the air traffic control voice receiver into a buffer and arranges the voice data packets according to the order of reception.

[0040] The central voice server decompresses and decodes the voice data packets in the buffer, and the digital signature server extracts the digital signature for restoration conversion to recover the digital voice information.

[0041] Furthermore, the voice communication unit is specifically used for:

[0042] The Radio Gateway device identifies the communication type of the digital voice information based on the digital signature, and the communication type includes ground-to-ground voice communication and ground-to-air voice communication.

[0043] If the communication type is ground-to-air voice communication, the Radio gateway device will convert the digital voice information into analog voice information by D / A conversion, and select the corresponding ground-to-air voice communication channel to forward the analog voice communication.

[0044] If the communication type is ground-to-ground voice communication, the Radio gateway device selects the corresponding ground-to-ground voice communication channel to forward the digital voice communication.

[0045] The beneficial effects of this invention are as follows: By adding digital signatures to voice information for information hiding, the communication type of voice information is identified based on the digital signature during air traffic control voice communication, and the corresponding communication channel is selected for communication forwarding based on the identification result. This enables ground-to-ground voice communication to use IP packet network links and ground-to-air voice communication to use VHF links, realizing ground-to-ground and ground-to-air voice communication forwarding on different channels; it saves air-to-ground voice communication frequency resources, reduces interference between multiple entities' voice communication in the same frequency band, and can effectively reduce the workload of controllers and pilots; communication between ground controllers changes from a traditional semi-public mode to a point-to-point visible mode, enhancing the privacy and security of voice communication, improving the safety level of air traffic control, and increasing the flexibility of ground-to-ground and ground-to-air voice communication, supporting further reduction of communication frequency spacing, and thus supporting more communication channels. Attached Figure Description

[0046] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0047] Figure 1 A flowchart of an enhanced air traffic control voice communication method provided in Embodiment 1 of the present invention;

[0048] Figure 2 This is a schematic diagram of an enhanced air traffic control voice communication method provided in Embodiment 1 of the present invention;

[0049] Figure 3 This is a block diagram of an enhanced air traffic control voice communication system provided in Embodiment 2 of the present invention;

[0050] Figure 4 This is a schematic diagram of an enhanced air traffic control voice communication system provided in Embodiment 2 of the present invention. Detailed Implementation

[0051] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0052] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0053] Example 1

[0054] Air traffic control voice communication generally includes ground-to-ground voice communication and ground-to-air voice communication. Ground-to-ground voice communication primarily meets the communication needs between ground controllers. For example, in the event of emergencies or severe weather, or when flight conditions change, timely coordination with ground personnel such as meteorologists, operations support personnel, and release personnel is required. Ground-to-ground voice communication mainly meets the communication needs between aircraft and ground controllers during flight. Aircraft in flight are always within the "line of sight" of the air traffic control center. When encountering special circumstances, such as weather impacts, air traffic control issues, or aircraft malfunctions, communication and coordination with the ground are necessary, and this voice communication system is used to establish a solid foundation for flight safety.

[0055] like Figure 1 and Figure 2 As shown, this embodiment provides a method for enhancing air traffic control voice communication, including:

[0056] S1: Obtain the voice information from the air traffic control voice transmitter, perform a hidden transformation on the voice information, add a digital signature, and obtain a voice data packet;

[0057] Specifically, the same communication channel is used to acquire the voice information from the air traffic control voice transmitter. The voice information includes both analog and digital signals. The system identifies whether the voice information is a digital signal. If not, it performs A / D conversion to digitize the analog voice signal, thereby uniformly converting the voice information into digital voice information.

[0058] A digital signature is added to the acquired digital voice information. This digital signature refers to embedding a digital watermark into the digital voice information using a watermark embedding algorithm. In this embodiment, the digital signature employs a complex cepstral method-based digital watermarking technology to perform information hiding processing on the digital voice information. The complex cepstral is a homomorphic mapping, which is an effective feature extraction method in speech recognition. Because the complex cepstral transform preserves all the information of the signal, it can reconstruct the signal to meet the basic requirements of the digital watermark transform domain.

[0059] For ease of understanding, this embodiment uses signal h(n) as an example, and its one-dimensional complex cepstrum a n (m) is defined as follows:

[0060] The inverse Z-transform of the logarithm of the Z-transform of h(n) is expressed as:

[0061]

[0062] The complex cepstrum can be calculated by replacing the Z-transform with the Fourier transform, that is:

[0063]

[0064] In the formula, It is the Fourier transform of the signal h(n), Z1[·] and F1[·] and F2[·] represent the one-dimensional Z-transform and the one-dimensional inverse Z-transform, respectively. These represent the one-dimensional Fourier transform and the one-dimensional inverse Fourier transform, respectively.

[0065] When adding a digital signature to digital voice information, the original audio signal is first divided into several frames, with 8 sampling points taken from each frame. The aforementioned one-dimensional complex cepstral transform is then applied to each frame to obtain 2N+1 complex cepstral coefficients. Finally, mean interpolation is performed on the even-numbered complex cepstral coefficients. The specific process is as follows:

[0066] (1) Let the original audio signal of the digital speech information be A={a(n),0≤n≤N-1}, where a(n)∈{0,1,2,…,2 p-1 The original audio signal A is divided into several frames, each containing L sampling points. Preferably, to ensure the transparency and robustness of the embedded digital watermark, L is recommended to be 8.

[0067] (2) Perform a one-dimensional complex cepstral transform on each frame of the original audio signal to obtain the first 2N+1 complex cepstral coefficients. Preferably, N can be 2.

[0068] (3) Perform the following mean interpolation operation on the complex cepstral coefficients at even-numbered points:

[0069]

[0070] The watermark embedding process is as follows:

[0071]

[0072] In the formula, ∝ is the embedding parameter (which can be 0.02), w(i) is the information to be embedded, the modified coefficients are obtained, and the modified coefficients are inversely transformed to obtain the audio signal containing the watermark.

[0073] After adding a digital signature to the digital voice information, it is compressed and encoded to hide the digital voice information and obtain a voice data frame. The voice data frame is the text data of the digital voice information. A header information is added to the voice data frame to form a voice data packet. The header information includes, but is not limited to, IP information and port information.

[0074] S2: The voice data packet is transmitted to the air traffic control voice receiver via the IP packet network and restored and converted to extract the digital signature and restore the voice information;

[0075] Specifically, VoIP technology is a communication technology that uses internet technology to transmit voice information. It digitizes analog voice signals and transmits them in real time over an IP network in the form of data packets, i.e., IP-based voice transmission. After the voice data packets are formed, they are transmitted through different network IP routes to the air traffic control voice receiving end via an IP packet network and placed in a buffer. At the same time, the voice data packets are arranged according to the order of reception.

[0076] The voice data packets in the buffer are decompressed and decoded, and their digital signatures are extracted for restoration conversion to recover the digital voice information. Preferably, the extraction of digital signatures includes:

[0077] (1) Let the digital audio signal to be recovered be A. s The digital audio signal to be recovered is divided into frames, each with a length of L, consistent with the segment length when embedding the watermark. Let the i-th segment of the digital audio signal to be recovered be A. s (i)={a s (i), 0≤i≤L-1};

[0078] (2) Perform a complex cepstral transform on each audio signal, take the first 2N+1 coefficients, and perform interpolation on the even coefficients of the complex cepstral transform:

[0079]

[0080] (3) Extract the embedding coefficients. The calculation formula is as follows:

[0081]

[0082] A threshold T is selected based on the actual air traffic control voice communication needs, where:

[0083]

[0084] (4) The obtained watermark sequence w * Inverting the sequence yields a new sequence w. p For sequence W p ={w p Upgrading (k)} yields a binary watermark sequence W, which is the extracted digital signature information.

[0085] S3: Identify the communication type of the voice information based on the digital signature, and select the corresponding communication channel based on the communication type to forward the voice information;

[0086] Specifically, the communication type of the digital voice information is identified based on the extracted digital signature, and the communication type includes ground-to-ground voice communication and ground-to-air voice communication.

[0087] If the communication type is ground-to-air voice communication, the digital voice information is converted from digital to analog voice information, and the corresponding ground-to-air voice communication channel is selected to forward the analog voice information. If the communication type is ground-to-ground voice communication, the corresponding ground-to-ground voice communication channel is directly selected to forward the digital voice information.

[0088] Furthermore, if the communication type is ground-to-air voice communication, a VHF link is selected as the communication channel to forward the analog voice; if the communication type is ground-to-ground voice communication, an IP packet network link is selected as the communication channel to forward the digital voice. Preferably, when the IP packet network link fails, the VHF link is used as the emergency communication channel for the ground-to-ground voice communication.

[0089] By using VHF links for air-to-ground communication and terrestrial IP packet network links for ground-to-ground voice communication, and by using VHF links as an emergency communication method for ground-to-ground voice communication, voice communication between ground controllers is isolated on separate channels, and there is no multi-channel aliasing problem in communication between ground controllers.

[0090] Preferably, while using VHF links for communication, ground-to-air voice communication can also utilize some of the channel resources saved by ground-to-ground voice communication channels, promoting the channel spacing from the conventional 25kHz to 8.33kHz, thereby avoiding the problem of audio aliasing between pilots and controllers in the same communication channel, and further improving the quality of ground-to-air communication.

[0091] It should be noted that the enhanced air traffic control voice communication method provided in this embodiment is scalable and can be applied to satellite voice communication, as well as urban air traffic, general aviation and other fields.

[0092] Example 2

[0093] like Figure 3 As shown, an enhanced air traffic control voice communication system includes: a voice input / output unit, a voice processing unit, and a voice communication unit;

[0094] The voice input / output unit is used to transmit voice information between the air traffic control voice transmitter and the air traffic control voice receiver;

[0095] The voice communication unit is used to convert the voice information between digital and analog signals.

[0096] The speech processing unit is used to perform hidden conversion and restored conversion on the speech information;

[0097] The voice communication unit is also used to identify the communication type of the voice information, and select the corresponding communication channel based on the communication type to forward the voice information.

[0098] Furthermore, the voice communication unit includes a Radio gateway device, and the voice processing unit includes a digital signature server and a central voice server;

[0099] The voice input / output unit acquires the voice information from the air traffic control voice transmitter and identifies whether the voice information is a digital signal. If not, the Radio gateway device performs A / D conversion on the voice information to convert the voice information into digital voice information.

[0100] The digital signature server adds a digital signature to the digital voice information, and the central voice server compresses and encodes the digital voice information to perform hidden conversion, thereby obtaining a voice data frame.

[0101] The central voice server adds header information to the voice data frames to form voice data packets.

[0102] Furthermore,

[0103] The voice input / output unit transmits the voice data packets to the air traffic control voice receiver via different network IP routes through an IP packet network.

[0104] The central voice server puts the voice data packets received by the air traffic control voice receiver into a buffer and arranges the voice data packets according to the order of reception.

[0105] The central voice server decompresses and decodes the voice data packets in the buffer, and the digital signature server extracts the digital signature for restoration conversion to recover the digital voice information.

[0106] Furthermore, the voice communication unit is specifically used for:

[0107] The Radio Gateway device identifies the communication type of the digital voice information based on the digital signature, and the communication type includes ground-to-ground voice communication and ground-to-air voice communication.

[0108] If the communication type is ground-to-air voice communication, the Radio gateway device will convert the digital voice information into analog voice information by D / A conversion, and select the corresponding ground-to-air voice communication channel to forward the analog voice communication.

[0109] If the communication type is ground-to-ground voice communication, the Radio gateway device selects the corresponding ground-to-ground voice communication channel to forward the digital voice communication.

[0110] Furthermore, such as Figure 4 As shown, the voice input / output unit consists of a traditional intercom unit and a VoIP intercom unit, including but not limited to a line interface module, a terminal communication module, and a telephone standby. The line interface module includes an IP packet network and a network switch.

[0111] Furthermore, it also includes a monitoring and maintenance unit, which provides functions for modifying system adaptation parameters, as well as functions for monitoring and controlling the status of each component.

[0112] It should be noted that for a more detailed description of the workflow of the enhanced air traffic control voice communication system, please refer to the aforementioned method implementation section, which will not be repeated here.

[0113] This invention hides information by adding digital signatures to voice information. During air traffic control voice communication, the communication type of the voice information is identified based on the digital signature, and the corresponding communication channel is selected for communication forwarding based on the identification result. This allows ground-to-ground voice communication to use IP packet network links and ground-to-air voice communication to use VHF links, enabling ground-to-ground and ground-to-air voice communication to be forwarded on different channels. This saves air-to-ground voice communication frequency resources, reduces interference between multiple entities in the same frequency band, and effectively reduces the workload of controllers and pilots. Communication between ground controllers changes from a traditional semi-public mode to a point-to-point visible mode, enhancing the privacy and security of voice communication, improving the safety level of air traffic control, and increasing the flexibility of ground-to-ground and ground-to-air voice communication. It also supports further reduction of communication frequency spacing, thereby supporting more communication channels.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A method for enhancing air traffic control voice communication, characterized in that, include: The voice information from the air traffic control voice transmitter is obtained, and the voice information is hidden and transformed to add a digital signature and obtain a voice data packet. The voice data packets are transmitted to the air traffic control voice receiver via an IP packet network and then restored and converted to extract the digital signature and restore the voice information. The communication type of the voice information is identified based on the digital signature, and the corresponding communication channel is selected based on the communication type to forward the voice information. The process of acquiring voice information from the air traffic control voice transmitter, performing a hidden transformation on the voice information to add a digital signature, and obtaining a voice data packet specifically involves: Acquire voice information from the air traffic control voice transmitter and identify whether the voice information is a digital signal. If not, perform A / D conversion on the voice information to convert the voice information into digital voice information. A digital signature is added to the digital voice information, and it is compressed and encoded for hidden conversion to obtain voice data frames; Add header information to the voice data frame to form a voice data packet; The process of transmitting the voice data packets to the air traffic control voice receiver via an IP packet network and performing restoration conversion to extract the digital signature and restore the voice information specifically involves: The voice data packets are transmitted to the air traffic control voice receiver via different network IP routes through the IP packet network. The voice data packets received by the air traffic control voice receiver are placed into a buffer, and the voice data packets are arranged in the order of reception. The voice data packets in the buffer are decompressed and decoded, and the digital signature is extracted for restoration conversion to recover the digital voice information; The step of identifying the communication type of the voice information based on the digital signature and selecting the corresponding communication channel to forward the voice information based on the communication type specifically includes: The communication type of the digital voice information is identified based on the digital signature, and the communication type includes ground-to-ground voice communication and ground-to-air voice communication; If the communication type is ground-to-air voice communication, the digital voice information is converted from digital to analog voice information, and the corresponding ground-to-air voice communication channel is selected to forward the analog voice communication. If the communication type is ground-to-ground voice communication, then the corresponding ground-to-ground voice communication channel is selected to forward the digital voice communication.

2. The method for enhancing air traffic control voice communication according to claim 1, characterized in that, The step of selecting the corresponding ground-to-air voice communication channel to forward the analog voice communication is specifically as follows: If the communication type is ground-to-air voice communication, then a VHF link is selected as the communication channel to forward the analog voice.

3. The method for enhancing air traffic control voice communication according to claim 1, characterized in that, The step of selecting the corresponding ground-to-ground voice communication channel to forward the digital voice communication is specifically as follows: If the communication type is ground-to-ground voice communication, then an IP packet network link is selected as the communication channel to forward the digital voice communication; When the IP packet network link fails, the VHF link will be used as an emergency communication channel for the ground-to-ground voice communication.

4. An enhanced air traffic control voice communication system, characterized in that, It includes a voice input / output unit, a voice processing unit, and a voice communication unit; The voice input / output unit is used to transmit voice information between the air traffic control voice transmitter and the air traffic control voice receiver; The voice communication unit is used to convert the voice information between digital and analog signals. The speech processing unit is used to perform hidden conversion and restored conversion on the speech information; The voice communication unit is also used to identify the communication type of the voice information, and select the corresponding communication channel based on the communication type to forward the voice information. The voice communication unit includes a Radio gateway device, and the voice processing unit includes a digital signature server and a central voice server. The voice input / output unit acquires the voice information from the air traffic control voice transmitter and identifies whether the voice information is a digital signal. If not, the Radio gateway device performs A / D conversion on the voice information to convert the voice information into digital voice information. The digital signature server adds a digital signature to the digital voice information, and the central voice server compresses and encodes the digital voice information to perform hidden conversion, thereby obtaining a voice data frame. The central voice server adds header information to the voice data frame to form a voice data packet. The voice input / output unit transmits the voice data packets to the air traffic control voice receiver via different network IP routes through an IP packet network. The central voice server puts the voice data packets received by the air traffic control voice receiver into a buffer and arranges the voice data packets according to the order of reception. The central voice server decompresses and decodes the voice data packets in the buffer, and the digital signature server extracts the digital signature for restoration conversion to recover the digital voice information; The voice communication unit is specifically used for: The Radio Gateway device identifies the communication type of the digital voice information based on the digital signature, and the communication type includes ground-to-ground voice communication and ground-to-air voice communication. If the communication type is ground-to-air voice communication, the Radio gateway device will convert the digital voice information into analog voice information by D / A conversion, and select the corresponding ground-to-air voice communication channel to forward the analog voice communication. If the communication type is ground-to-ground voice communication, the Radio gateway device selects the corresponding ground-to-ground voice communication channel to forward the digital voice communication.

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