IP data networking communication system and method based on very low rate satellite channel

Abstract

The invention provides an IP data networking communication system and method based on a very-low-rate satellite channel, and belongs to the technical field of low-rate satellite communication. According to the method, a satellite communication network is established, a network manager enables standard IP data transmission protocols such as an IP address and an MAC address of a terminal to correspond to a terminal number, and the terminal number is used as a communication address, so that the overhead of channel occupation of the transmission protocols is reduced; the requirement of a user for using a standard IP transmission protocol is met through protocol cheating of the channel terminal on the host; a network management storage and forwarding function is designed, so that the requirement of a user for randomly sending IP data can be met; and a Ku / C frequency band satellite control channel is designed, so that the time for synchronously replacing satellites by the master station and the slave station is shortened. According to the invention, the utilization efficiency of the low-rate satellite channel is improved, and the transmission delay of the IP data is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of low-rate satellite communication, and in particular to an IP data networking communication system and method based on a very low-rate satellite channel. Background Art

[0002] Traditional point-to-point satellite communication systems require many manual interventions or operations during system activation or business communication, such as manually switching frequencies and adjusting transmission power. The system is complex to use and slow to activate. In satellite communication systems, each earth station is hundreds or even thousands of kilometers apart. When the system needs to replace a satellite, the master station and the slave station can only switch satellites according to a pre-agreed plan without other means of communication. The satellite switching method is inflexible.

[0003] The satellite communication system based on synchronous orbit satellites has an orbital altitude of about 36,000 kilometers from the ground. Only one satellite is needed to complete long-distance communication of more than 10,000 kilometers. The round-trip time of wireless signals between the ground station and the satellite is about 260ms, and the transmission delay is relatively large. In traditional IP data communication, the sender needs to send an ARP request first. The request content mainly includes the source MAC address, source IP address, and destination IP address; after the receiver receives the ARP request, it replies to the ARP request. The reply content mainly includes the source MAC address, source IP address, destination MAC address, and destination IP address; two round-trip processes are required, which takes at least 520ms to start transmitting IP data. The protocol frame for sending data includes the source MAC address, destination MAC address, frame type, etc. Generally, the source MAC address is 6 bytes, the destination MAC address is 6 bytes, and the protocol type is 2 bytes, totaling 14 bytes. For low-rate satellite communication systems, the channel rate is only a few kbps, or even hundreds or tens of bps, and more than a dozen bytes already occupy a large channel overhead.

[0004] Based on the IP data networking communication of low-speed satellite channels, the network management protocol and IP communication protocol overhead occupy a large amount of channel resources, affecting the communication efficiency of the system. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the above-mentioned background technology and to provide an IP data networking communication system and method based on a very low-rate satellite channel, which can effectively improve the system activation speed and system application flexibility, reduce IP data transmission delay, and improve channel resource utilization efficiency.

[0006] The technical solution adopted by the present invention is:

[0007] An IP data networking communication system based on a very low rate satellite channel comprises a network management, a master station, a satellite and a slave station, wherein the master station and the slave station each comprise a user host, a channel terminal and a servo antenna, and the slave station further comprises a wide beam antenna, the network management communicates with the channel terminal of the master station via a cable, and the master station and the slave station both communicate with the satellite via an antenna;

[0008] Before joining the network, the master station and the slave station set their own numbers and the network access parameters of the channel terminal according to the planning of the network management, including: network number, carrier receiving frequency, system time, terminal number, terminal IP address;

[0009] The network manager sends the satellite's orbital position and beacon frequency information to the master station through a cable. The master station aligns its own servo antenna with the satellite based on the orbital position and beacon frequency information, and then sends the orbital position and beacon frequency information to the satellite through the servo antenna, which is broadcast by the satellite. The slave station receives the orbital position and beacon frequency information broadcast by the satellite through a wide-beam antenna, and then aligns its own servo antenna with the satellite based on the orbital position and beacon frequency information.

[0010] After the servo antennas of the master station and the slave station have completed the alignment with the satellite, the master station receives the notification frame from the network manager through the cable, initiates the network access application, completes the network access, and then sends the network manager's notification frame to the satellite through the servo antenna. The slave station receives the notification frame forwarded by the satellite through its own servo antenna, initiates the network access application, and completes the network access.

[0011] After the master station and the slave station are connected to the network, the transmission frequency and transmission power parameters are adjusted to carry out IP data communication based on protocol deception; two-line voice and IP data communication are carried out simultaneously by dialing a telephone number.

[0012] Furthermore, the servo antennas of the master station and the slave station are multi-band large-aperture antennas, and the wide-beam antenna of the slave station is a multi-band wide-beam antenna.

[0013] An IP data networking communication method based on a very low rate satellite channel comprises the following steps:

[0014] Step 1: The master station and the slave station set the network access parameters of their respective channel terminals according to the planning of the network management, including: network number, carrier receiving frequency, system time, terminal number, and terminal IP address;

[0015] Step 2: The network manager sends the satellite's orbital position and beacon frequency information to the master station through a cable. The master station aligns its own servo antenna with the satellite based on the orbital position and beacon frequency information, and then sends the orbital position and beacon frequency information to the satellite through the servo antenna, which is broadcast by the satellite. The slave station receives the orbital position and beacon frequency information broadcast by the satellite through a wide-beam antenna, and then aligns its own servo antenna with the satellite based on the orbital position and beacon frequency information.

[0016] Step 3: After the servo antennas of the master station and the slave station have completed the alignment with the satellite, the master station receives the notification frame from the network management through the cable, adjusts the transmission frequency and transmission power parameters, initiates the network access application, and completes the network access;

[0017] Step 4: After the master station joins the network, it sends the notification frame of the network management to the satellite through the servo antenna. The slave station receives the notification frame forwarded by the satellite through its own servo antenna, and then adjusts the transmission frequency and transmission power parameters, initiates the network access application, and completes the network access;

[0018] Step 5: After the master station and the slave station are connected to the network, the transmission frequency and transmission power parameters are adjusted to perform IP data communication based on protocol deception; two-line voice and IP data communication are performed simultaneously by dialing a telephone number.

[0019] Furthermore, the value range of the network number N is 1 to 99;

[0020] The value range of network capacity M is 10 to 99;

[0021] The master terminal number is (N-1)*M+1;

[0022] The slave terminal number is (N-1)*M+X, where X ranges from 2 to M;

[0023] The telephone number has 4 digits in total, the upper two digits and the lower two digits are the numbers of the corresponding channel terminals.

[0024] Furthermore, the IP address of the channel terminal is consistent with the IP address of the user host connected thereto, and the network number of the channel terminal is consistent with the network number of the network management;

[0025] The transmission frequency of the channel terminal of the master station is:

[0026] Satellite transponder center frequency - 11500MHz - BW / 2,

[0027] The transmission frequency of the channel terminal of the slave station is:

[0028] Satellite transponder center frequency -11500MHz+BW / 2,

[0029] Among them, the value range of BW is 2MHz to 18MHz;

[0030] The receiving frequencies of the channel terminals of the master and slave stations are:

[0031] Satellite transponder center frequency -11500MHz.

[0032] Furthermore, the specific method of step 3 is:

[0033] After receiving the notification frame from the network manager, the master station sends a network access application to the network manager;

[0034] After the network management detects that the received network number and the terminal number of the master station channel terminal are consistent with the network number and the terminal number of the master station channel terminal planned for this network, the master station is allowed to access the network;

[0035] After the master station is connected to the network, the terminal IP address of the master station channel terminal is sent to the network manager, and the network manager binds the terminal number of the master station channel terminal with the terminal IP address.

[0036] Furthermore, the specific method of step 4 is:

[0037] After the master station completes the network access, the slave station receives the notification frame from the network manager and then sends a network access application to the network manager;

[0038] After the network management detects that the received network number and the terminal number of the slave channel terminal are consistent with the network number and the terminal number of the slave channel terminal planned for the network, the slave is allowed to access the network;

[0039] After the slave station is connected to the network, the terminal IP address of the slave station channel terminal is sent to the network manager, and the network manager binds the terminal number of the slave station channel terminal with the terminal IP address;

[0040] The network management stores the correspondence between the terminal number and the terminal IP address of each station channel terminal in the routing table and notifies it to each channel terminal in the network.

[0041] Furthermore, in step 5, the method of IP data communication based on protocol spoofing is:

[0042] In the source slave station, the host selects the terminal IP address of the channel terminal of the destination slave station as the destination IP address according to the routing table;

[0043] The host periodically sends an ARP request to the channel terminal. The ARP request includes the source IP address, destination IP address, and source MAC address. The channel terminal replies its own MAC address to the host.

[0044] The channel terminal periodically sends an ARP request to the host. The ARP request includes the source IP address, destination IP address, and source MAC address. The host replies its own MAC address to the channel terminal.

[0045] The host sends IP data to the channel terminal, including source IP address, destination IP address, source MAC address, destination MAC address, protocol type, and data;

[0046] The channel terminal removes the source IP address, the destination IP address, the source MAC address, and the destination MAC address, and reframes the frame using the terminal number of the channel terminal corresponding to the source IP address as the source address and the terminal number of the channel terminal corresponding to the destination IP address as the destination address.

[0047] The channel terminal searches the routing table. If the channel terminal of the destination slave station has been connected to the network, the reframed IP data is forwarded to the destination slave station. Otherwise, the reframed IP data is forwarded to the network manager. The network manager stores the received IP data and forwards the IP data to the destination slave station after the channel terminal of the destination slave station has been connected to the network.

[0048] In the destination slave station, the host periodically sends an ARP request to the channel terminal. The ARP request includes the source IP address, the destination IP address, and the source MAC address. The channel terminal replies its own MAC address to the host.

[0049] The channel terminal periodically sends an ARP request to the host. The ARP request includes the source IP address, destination IP address, and source MAC address. The host replies its own MAC address to the channel terminal.

[0050] The channel terminal recovers the source IP address, destination IP address, source MAC address, and destination MAC address based on the source address and destination address in the received IP data, reframes the IP data, and sends the reframed IP data to the host.

[0051] Furthermore, when the user initiates a voice service, in order to ensure real-time transmission of IP data, the IP data and the voice service are transmitted simultaneously on one carrier in a time-division multiplexing manner, and different service types use different type identifiers; after the master station decomposes the IP data, it sends them to different destination slave stations respectively, so that the same slave station can communicate IP data with the master station or slave station while communicating voice services with another slave station.

[0052] Compared with the background technology, the present invention has the following advantages:

[0053] 1. The present invention adopts a satellite networking communication mode, which improves the system opening speed, simplifies the business communication process, and can meet the needs of rapid response of emergency satellite communications.

[0054] 2. The present invention utilizes a multi-band satellite-specific control channel that is not limited by satellites to control the slave station and the master station to synchronously replace satellites, thereby solving the problem of the traditional method of relying on a predetermined plan to replace satellites in a long time.

[0055] 3. The present invention adopts protocol deception technology to reduce the amount of protocol data actually transmitted by the satellite channel, reduce the delay of service transmission, and improve the utilization efficiency of the channel.

[0056] 4. The present invention supports the host online and offline data communication functions, meets the user's demand for random data transmission, and improves the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1It is a schematic diagram of a low-speed satellite channel IP data networking communication system based on protocol deception in an embodiment of the present invention.

[0058] Figure 2 It is a schematic diagram of the satellite coded transmission control channel.

[0059] Figure 3 It is a schematic diagram of the IP data communication principle based on protocol deception. DETAILED DESCRIPTION

[0060] The present invention will be further described below in conjunction with the accompanying drawings.

[0061] An IP data networking communication system based on a very low rate satellite channel, such as Figure 1 As shown, it includes a network management, a master station, a satellite and a slave station. The master station and the slave station each include a user host, a channel terminal and a servo antenna. The slave station also includes a wide beam antenna. The network management communicates with the channel terminal of the master station through a cable, and the master station and the slave station both communicate with the satellite through an antenna. The network management automatically controls the parameters such as the transmission power and transmission frequency of each channel terminal to establish a reliable communication link. After the link is established, automatic power control is performed to optimize the power utilization efficiency of the system.

[0062] Before joining the network, the master station and the slave station set their own numbers and the network access parameters of the channel terminal according to the planning of the network management, including: network number, carrier receiving frequency, system time, terminal number, terminal IP address;

[0063] The network manager sends the satellite's orbital position and beacon frequency information to the master station through a cable. The master station aligns its own servo antenna with the satellite based on the orbital position and beacon frequency information, and then sends the orbital position and beacon frequency information to the satellite through the servo antenna, which is broadcast by the satellite. The slave station receives the orbital position and beacon frequency information broadcast by the satellite through a wide-beam antenna, and then aligns its own servo antenna with the satellite based on the orbital position and beacon frequency information.

[0064] After the servo antennas of the master station and the slave station have completed the alignment with the satellite, the master station receives the notification frame from the network manager through the cable, initiates the network access application, completes the network access, and then sends the network manager's notification frame to the satellite through the servo antenna. The slave station receives the notification frame forwarded by the satellite through its own servo antenna, initiates the network access application, and completes the network access.

[0065] After the master station and the slave station are connected to the network, the transmission frequency and transmission power parameters are adjusted to carry out IP data communication based on protocol deception; two-line voice and IP data communication are carried out simultaneously by dialing a telephone number.

[0066] Furthermore, the servo antennas of the master station and the slave station are multi-band large-aperture antennas, and the wide-beam antenna of the slave station is a multi-band wide-beam antenna.

[0067] An IP data networking communication method based on a very low rate satellite channel comprises the following steps:

[0068] Step 1: The master station and the slave station set the network access parameters of their respective channel terminals in the channel terminal monitoring interface according to the planning of the network management, including: network number, carrier receiving frequency, system time, terminal number, and terminal IP address; the parameters planned by the network management mainly include satellite orbit position, satellite beacon frequency, satellite G / T value, satellite transponder center frequency, network number, network capacity, terminal number, system time, etc. The satellite orbit position, satellite beacon frequency, satellite G / T value, and satellite transponder center frequency are pre-stored in the satellite resource database of the network management, and satellite resources that meet the communication requirements are retrieved from the satellite resource database according to the communication guarantee task requirements;

[0069] The system time is based on the network management time, and its changing pattern is consistent with Beijing time. The start time is the time when each task is planned.

[0070] The setting rules for network access parameters are as follows:

[0071] The value range of network number N is 1 to 99;

[0072] The value range of network capacity M is 10 to 99;

[0073] The master terminal number is (N-1)*M+1;

[0074] The slave terminal number is (N-1)*M+X, where X ranges from 2 to M;

[0075] The telephone number has 4 digits in total, the upper two digits and the lower two digits are the numbers of the corresponding channel terminals.

[0076] The terminal network access parameter setting method is:

[0077] Set the network access parameters in the channel terminal monitoring interface. The IP address of the channel terminal should be consistent with the IP address of the user host connected to it, and the network number of the channel terminal should be consistent with the network number of the network management.

[0078] The transmission frequency of the channel terminal of the master station is:

[0079] Satellite transponder center frequency - 11500MHz - BW / 2,

[0080] The transmission frequency of the channel terminal of the slave station is:

[0081] Satellite transponder center frequency -11500MHz+BW / 2,

[0082] Among them, the value range of BW is 2MHz to 18MHz;

[0083] The receiving frequencies of the channel terminals of the master and slave stations are:

[0084] Satellite transponder center frequency -11500MHz.

[0085] The system time is only set at the initial stage of the task, and the time setting accuracy error is at the minute level. After that, under the power supply of the built-in battery of the channel terminal, the channel terminal can maintain consistency with the network management time even if the channel terminal is powered off.

[0086] Step 2: The network manager sends the satellite's orbital position and beacon frequency information to the master station via a cable.

[0087] like Figure 2 In order to reduce the amount of data transmitted through the channel, the main basic parameters such as satellite name, satellite orbit, satellite beacon frequency, polarization mode, etc. are encoded as shown in the following table:

[0088]

[0089] The network management, the master station channel terminal and the slave station channel terminal store the satellite parameter table.

[0090] In order to improve the reliability and adaptability of the dedicated control channel, a dual-band control channel receiving system is designed. The master station selects Ku-band or C-band to transmit control instructions according to the satellite status in the mission area.

[0091] The network manager selects the satellite to be used from the satellite parameter table and sends the satellite code to the master station through the wired channel. The master station searches for the satellite's orbital position, beacon frequency, polarization mode and other information based on the satellite code, and controls the servo antenna to complete the alignment. The master station uses a Ku or C band transmitter and a large-diameter antenna with an antenna diameter of no less than 2.4 meters to send the satellite code to the slave station; the slave station uses a wide-beam antenna to receive the satellite code, and the antenna beam width is no less than 120 degrees. The receiver supports simultaneous duty in the Ku and C dual bands. After receiving the satellite code, the receiver searches for the satellite's orbital position, beacon frequency, polarization mode and other information based on the satellite code, and then controls the servo antenna to complete the alignment.

[0092] The slave station is equipped with a wide-beam antenna to avoid the problem of satellite search. The slave station can receive the satellite code transmitted by the master station from any satellite.

[0093] Step 3: After the servo antennas of the master station and the slave station have completed the alignment with the satellite, the master station receives the notification frame from the network management through the cable, adjusts the transmission frequency and transmission power parameters, initiates the network access application, and completes the network access; the specific method is:

[0094] After receiving the notification frame from the network manager, the master station sends a network access application to the network manager;

[0095] After the network management detects that the received network number and the terminal number of the master station channel terminal are consistent with the network number and the terminal number of the master station channel terminal planned for this network, the master station is allowed to access the network;

[0096] After the master station is connected to the network, the terminal IP address of the master station channel terminal is sent to the network manager, and the network manager binds the terminal number of the master station channel terminal with the terminal IP address.

[0097] Step 4: After the master station joins the network, it sends the network management notification frame to the satellite through the servo antenna. The slave station receives the notification frame forwarded by the satellite through its own servo antenna, and then adjusts the transmission frequency and transmission power parameters, initiates the network access application, and completes the network access. The specific method is:

[0098] After the master station completes the network access, the slave station receives the notification frame from the network manager and then sends a network access application to the network manager;

[0099] After the network management detects that the received network number and the terminal number of the slave channel terminal are consistent with the network number and the terminal number of the slave channel terminal planned for the network, the slave is allowed to access the network;

[0100] After the slave station is connected to the network, the terminal IP address of the slave station channel terminal is sent to the network manager, and the network manager binds the terminal number of the slave station channel terminal with the terminal IP address;

[0101] The network management stores the correspondence between the terminal number and the terminal IP address of each station channel terminal in the routing table and notifies it to each channel terminal in the network.

[0102] Step 5: After the master station and the slave station are connected to the network, the master station and the slave station, and the slave stations can communicate online or offline, that is, IP data communication based on protocol spoofing, and two-line voice and IP data communication can be carried out simultaneously by dialing a phone number. Figure 3 As shown, the specific method is:

[0103] In the source slave station, the host selects the terminal IP address of the channel terminal of the destination slave station as the destination IP address according to the routing table;

[0104] The host periodically sends an ARP request to the channel terminal. The ARP request includes the source IP address, destination IP address, and source MAC address. The channel terminal replies its own MAC address to the host.

[0105] The channel terminal periodically sends an ARP request to the host. The ARP request includes the source IP address, destination IP address, and source MAC address. The host replies its own MAC address to the channel terminal.

[0106] The host sends IP data to the channel terminal, including source IP address, destination IP address, source MAC address, destination MAC address, protocol type, and data;

[0107] The channel terminal removes the source IP address, destination IP address, source MAC address, and destination MAC address, and reframes the frame using the terminal number corresponding to the source IP address as the source address and the terminal number corresponding to the destination IP address as the destination address.

[0108] The channel terminal searches the routing table. If the channel terminal of the destination slave station has been connected to the network, the reframed IP data is forwarded to the destination slave station. Otherwise, the reframed IP data is forwarded to the network manager. The network manager stores the received IP data and forwards the IP data to the destination slave station after the channel terminal of the destination slave station has been connected to the network.

[0109] In the destination slave station, the host periodically sends an ARP request to the channel terminal. The ARP request includes the source IP address, the destination IP address, and the source MAC address. The channel terminal replies its own MAC address to the host.

[0110] The channel terminal periodically sends an ARP request to the host. The ARP request includes the source IP address, destination IP address, and source MAC address. The host replies its own MAC address to the channel terminal.

[0111] The channel terminal recovers the source IP address, destination IP address, source MAC address, and destination MAC address based on the source address and destination address in the received IP data, reframes the IP data, and sends the reframed IP data to the host.

[0112] When the user initiates a voice service, the network management automatically switches the transmission power, transmission frequency and other parameters of the master station channel terminal and the slave station channel terminal to establish a reliable communication link; after the link is established, automatic power control is performed to optimize the system power utilization efficiency; when the voice service is over, the network management switches the master station channel terminal and the slave station channel terminal back to the transmission power and transmission frequency of IP data, and performs power control in real time to optimize power utilization. Power control can reduce the power consumption of portable stations when they are powered by batteries in the field, extend the standby time of portable stations, and improve the communication guarantee capability of portable stations.

[0113] When performing voice services, in order to ensure real-time transmission of IP data, IP data and voice services are transmitted simultaneously on one carrier in a time-division multiplexing manner, and different service types use different type identifiers; after data decomposition, the master station sends different data to different slave stations respectively, so that the same slave station can communicate IP data with the master station or slave station while communicating voice services with another slave station.

[0114] The present invention designs the sending frequency and the receiving frequency relative to the central frequency of the satellite transponder, so that one-channel hardware design can support multi-channel signal reception.

[0115] The system time is only set at the initial stage of the task, and the time setting accuracy error is at the minute level. After that, under the power supply of the built-in battery of the terminal, even if the channel terminal is powered off, it can maintain consistency with the network management time.

[0116] The present invention uses terminal numbers instead of IP addresses and MAC addresses, simplifies the complexity of IP data communication protocols, reduces the extra overhead of low-speed channel transmission, and improves the utilization rate of channel resources. By reducing network capacity, the transmission capacity of each station in the network can be improved, and the communication needs of key users can be effectively guaranteed.

[0117] The present invention adopts the mutual deception technology of channel terminal and host protocol, simplifies the process of protocol interaction between two earth stations (i.e., master station or slave station), and reduces the delay of IP data transmission.

[0118] The master station and slave stations, and slave stations and slave stations planned in the network can communicate online or offline. Through online or offline data communication, the user's needs for random IP data transmission are met, which can be applied to emergency satellite communications.

[0119] The present invention realizes networking IP data communication under the condition of low satellite channel rate, improves the automation degree of system operation, and improves the communication guarantee capability of the system; uses a 1-byte terminal number to replace more than ten bytes such as source MAC address, destination MAC address, source IP address, destination IP address, frame type, etc., reduces the protocol overhead of channel transmission, improves channel resource utilization, and reduces IP data transmission delay; the protocol deception between the host and the channel terminal enables the standard IP data transmission protocol to be applied to the low-speed satellite communication system.

[0120] In summary, the present invention forms a satellite communication network, and the network management matches the standard IP data transmission protocols such as the IP address and MAC address of the channel terminal with the terminal number, and uses the terminal number as the communication address, thereby reducing the overhead of the transmission protocol occupying the channel; through the protocol deception of the channel terminal to the host, the user's demand for using the standard IP transmission protocol is met; the network management storage and forwarding function is designed to meet the user's demand for sending IP data at will; the Ku / C frequency band satellite control channel is designed to reduce the time for the master station and the slave station to synchronously replace the satellite. The present invention improves the utilization efficiency of the low-speed satellite channel and reduces the transmission delay of IP data.

Claims

1. An IP data networking communication system based on a very low rate satellite channel, characterized in that: It includes a network management, a master station, a satellite and a slave station. The master station and the slave station each include a user host, a channel terminal and a servo antenna. The slave station also includes a wide beam antenna. The network management communicates with the channel terminal of the master station through a cable. The master station and the slave station both communicate with the satellite through an antenna. Before joining the network, the master station and the slave station set their own numbers and the network access parameters of the channel terminal according to the planning of the network management, including: network number, carrier receiving frequency, system time, terminal number, terminal IP address; The network manager sends the satellite's orbital position and beacon frequency information to the master station through a cable. The master station aligns its own servo antenna with the satellite based on the orbital position and beacon frequency information, and then sends the orbital position and beacon frequency information to the satellite through the servo antenna, which is broadcast by the satellite. The slave station receives the orbital position and beacon frequency information broadcast by the satellite through a wide-beam antenna, and then aligns its own servo antenna with the satellite based on the orbital position and beacon frequency information. After the servo antennas of the master station and the slave station have completed the alignment with the satellite, the master station receives the notification frame from the network manager through the cable, initiates the network access application, completes the network access, and then sends the network manager's notification frame to the satellite through the servo antenna. The slave station receives the notification frame forwarded by the satellite through its own servo antenna, initiates the network access application, and completes the network access. After the master station and the slave station are connected to the network, the transmission frequency and transmission power parameters are adjusted to carry out IP data communication based on protocol deception; two-line voice and IP data communication are carried out simultaneously by dialing a telephone number.

2. The IP data networking communication system based on a very low rate satellite channel according to claim 1, characterized in that: The servo antennas of the master station and the slave station are multi-band large-aperture antennas, and the wide-beam antenna of the slave station is a multi-band wide-beam antenna.

3. A method for IP data networking communication based on a very low rate satellite channel, characterized in that: The following steps are involved: Step 1: The master station and the slave station set the network access parameters of their respective channel terminals according to the planning of the network management, including: network number, carrier receiving frequency, system time, terminal number, and terminal IP address; Step 2: The network manager sends the satellite's orbital position and beacon frequency information to the master station through a cable. The master station aligns its own servo antenna with the satellite based on the orbital position and beacon frequency information, and then sends the orbital position and beacon frequency information to the satellite through the servo antenna, which is broadcast by the satellite. The slave station receives the orbital position and beacon frequency information broadcast by the satellite through a wide-beam antenna, and then aligns its own servo antenna with the satellite based on the orbital position and beacon frequency information. Step 3: After the servo antennas of the master station and the slave station have completed the alignment with the satellite, the master station receives the notification frame from the network management through the cable, adjusts the transmission frequency and transmission power parameters, initiates the network access application, and completes the network access; Step 4: After the master station joins the network, it sends the notification frame of the network management to the satellite through the servo antenna. The slave station receives the notification frame forwarded by the satellite through its own servo antenna, and then adjusts the transmission frequency and transmission power parameters, initiates the network access application, and completes the network access; Step 5: After the master station and the slave station are connected to the network, the transmission frequency and transmission power parameters are adjusted to perform IP data communication based on protocol deception; two-line voice and IP data communication are performed simultaneously by dialing a telephone number.

4. The IP data networking communication method based on a very low rate satellite channel according to claim 3, characterized in that: The value range of network number N is 1 to 99; The value range of network capacity M is 10 to 99; The master station channel terminal number is (N-1)*M+1; The slave channel terminal number is (N-1)*M+X, where X ranges from 2 to M; The telephone number has 4 digits in total, the upper two digits and the lower two digits are the numbers of the corresponding channel terminals.

5. The IP data networking communication method based on a very low rate satellite channel according to claim 3, characterized in that: The IP address of the channel terminal is consistent with the IP address of the user host connected to it, and the network number of the channel terminal is consistent with the network number of the network management; The transmission frequency of the channel terminal of the master station is: Satellite transponder center frequency - 11500MHz - BW / 2, The transmission frequency of the channel terminal of the slave station is: Satellite transponder center frequency -11500MHz+BW / 2, Among them, the value range of BW is 2MHz to 18MHz; The receiving frequencies of the channel terminals of the master and slave stations are: Satellite transponder center frequency -11500MHz.

6. The IP data networking communication method based on a very low rate satellite channel according to claim 3, characterized in that: The specific method of step 3 is: After receiving the notification frame from the network manager, the master station sends a network access application to the network manager; After the network management detects that the received network number and master station terminal number are consistent with the network number and master station terminal number planned for the network, the master station is allowed to access the network; After the master station is connected to the network, the IP address of the channel terminal of the master station is sent to the network manager, and the network manager binds the terminal number of the channel terminal of the master station with the terminal IP address.

7. The IP data networking communication method based on a very low rate satellite channel according to claim 3, characterized in that: The specific method of step 4 is: After the master station completes the network access, the slave station receives the notification frame from the network manager and then sends a network access application to the network manager; After the network management detects that the received network number and the terminal number of the slave channel terminal are consistent with the network number and the terminal number of the slave channel terminal planned for the network, the slave is allowed to access the network; After the slave station is connected to the network, the IP address of the slave station's channel terminal is sent to the network manager, and the network manager binds the terminal number of the slave station's channel terminal with the terminal IP address; The network management stores the correspondence between the terminal number and the terminal IP address of the channel terminal of each station in the routing table and notifies it to each channel terminal in the network.

8. The IP data networking communication method based on a very low rate satellite channel according to claim 3, characterized in that: In step 5, the IP data communication method based on protocol spoofing is: In the source slave station, the host selects the IP address of the channel terminal of the destination slave station as the destination IP address according to the routing table; The host periodically sends an ARP request to the channel terminal. The ARP request includes the source IP address, destination IP address, and source MAC address. The channel terminal replies its own MAC address to the host; The channel terminal periodically sends an ARP request to the host. The ARP request includes the source IP address, destination IP address, and source MAC address. The host replies its own MAC address to the channel terminal. The host sends IP data to the channel terminal, including source IP address, destination IP address, source MAC address, destination MAC address, protocol type, and data; The channel terminal removes the source IP address, the destination IP address, the source MAC address, and the destination MAC address, and reframes the frame using the terminal number of the channel terminal corresponding to the source IP address as the source address and the terminal number of the channel terminal corresponding to the destination IP address as the destination address. The channel terminal searches the routing table, and if the channel terminal of the destination slave station has been connected to the network, the reframed IP data is forwarded to the destination slave station; Otherwise, the reframed IP data is forwarded to the network management; the network management stores the received IP data, and after the channel terminal of the destination slave station is connected to the network, the IP data is forwarded to the destination slave station; In the destination slave station, the host periodically sends an ARP request to the channel terminal. The ARP request includes the source IP address, the destination IP address, and the source MAC address; The channel terminal replies its own MAC address to the host; The channel terminal periodically sends an ARP request to the host. The ARP request includes the source IP address, destination IP address, and source MAC address. The host replies its own MAC address to the channel terminal. The channel terminal recovers the source IP address, destination IP address, source MAC address, and destination MAC address based on the source address and destination address in the received IP data, reframes the IP data, and sends the reframed IP data to the host.

9. The IP data networking communication method based on a very low rate satellite channel according to claim 3, characterized in that: When a user initiates a voice service, in order to ensure real-time transmission of IP data, the IP data and voice service are transmitted simultaneously on one carrier in a time-division multiplexing manner, and different service types use different type identifiers; after the master station decomposes the IP data, it sends them to different destination slave stations respectively, so that the same slave station can communicate IP data with the master station or slave station while communicating voice service with another slave station.

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