A low-speed user multi-dimensional multi-address networking communication method for efficient utilization of satellite resources

Abstract

The present invention proposes a low-speed user multi-dimensional multi-address networking communication method for efficient use of satellite resources, and belongs to the field of satellite communication technology. The present invention includes: according to the number of users and communication service requirements, the network management plans the satellite transponder resources used in the communication process; the master station transmits a network access signal to the satellite, and the master station receives the master station network access signal forwarded by the satellite; the small station transmits a network access signal to the satellite, and the master station receives the small station network access signal forwarded by the satellite; after the master station and the small station are connected to the network, the master station and the small station transmit business communication signals to perform low-speed networking communication. The present invention is suitable for emergency low-speed communication needs. When satellite resources are in short supply and dedicated satellite resources cannot be applied for, a space-visible satellite transparent transponder can be used to form an emergency communication network for communication.

Description

Technical Field

[0001] The present invention relates to the field of satellite communication technology, and in particular to a low-speed user multi-dimensional multi-address networking communication method for efficient use of satellite resources. Background Art

[0002] Satellite communication has the advantages of wide coverage, good channel quality and low communication cost. As the application of satellite communication becomes more and more extensive, the problem of satellite resource shortage is becoming more and more obvious. The traditional satellite communication system mainly includes FDMA system, TDMA system and CDMA system.

[0003] In the FDMA frequency division multiple access transmission system, each user is allocated a frequency resource. Different users are distinguished based on satellite frequency resources. The more users there are, the more satellite frequency resources they occupy. Satellite resources for different users are separated by protection bands. The more users there are, the more protection bands there are, and the efficiency of satellite frequency resources decreases.

[0004] In the TDMA time division multiple access transmission system, each user occupies a time slot, and different users are distinguished based on the time slots. Since different ground stations are at different distances from the satellite, in order to avoid collision and mutual interference between the signals transmitted by each station on the satellite, protection time slots are added between adjacent time slots, resulting in reduced communication efficiency of the TDMA transmission system.

[0005] In CDMA code division multiple access, each user is assigned an address code, and different users are distinguished based on the address code. Multiple users share a segment of satellite frequency resources. The more users there are, the more obvious the impact of multiple access interference between signals, and the lower the utilization rate of satellite resources.

[0006] Therefore, there is an urgent need to improve the utilization efficiency of satellite resources.

[0007] In emergency situations such as earthquake relief, it may not be possible to apply for satellite resources in a short period of time, and an emergency satellite communication method is needed. During the opening process of a general low-speed point-to-point satellite communication system, it is necessary to manually adjust the terminal's signal power, address code, transmission frequency and other parameters. The operation is complicated and the opening time is long. It is difficult to meet the requirements of earthquake relief and other occasions with high opening speed requirements, and it is not convenient for multiple users. Summary of the invention

[0008] The purpose of the present invention is to overcome the shortcomings of the above-mentioned background technology and to provide a low-speed user multi-dimensional multi-address networking communication method with efficient utilization of satellite resources. Under the condition that dedicated satellite resources cannot be applied for, visible and transparent satellite resources in space are used to form a satellite communication network for low-speed emergency communications.

[0009] The technical solution adopted by the present invention is:

[0010] A low-speed user multi-dimensional multi-address networking communication method for efficient use of satellite resources comprises the following steps:

[0011] Step 1: Based on the number of users and communication service requirements, the network manager plans the satellite transponder resources used in the communication process;

[0012] Step 2: The master station transmits a network access signal to the satellite, and the master station receives the master station network access signal forwarded by the satellite;

[0013] Step 3: The small station transmits a network access signal to the satellite, and the main station receives the small station network access signal forwarded by the satellite;

[0014] Step 4: After the master station and the small station are connected to the network, the master station and the small station transmit business communication signals to carry out low-speed networking communication.

[0015] Furthermore, in step 1, the satellite transponder resource usage method is:

[0016] The satellite transponder is a transparent satellite transponder, and the communication frequency band is the Ku band; there is a signal on the transponder that can cooperate with the communication; during the use of satellite resources, the loss of the signal-to-noise ratio of the cooperative communication signal caused by the low-speed communication signal is less than dB, is the value agreed with the satellite company;

[0017] The network manager divides the satellite transponder frequency resources into multiple frequency bands;

[0018] The network management divides satellite resources of one or more frequency bands into network control time slots and service time slots in a time division multiple access manner for small stations to access the network and non-real-time service communications. The number and position of network control time slots and service time slots can be adjusted dynamically; each time slot supports multiple address codes for code division multiple access communications, and the communication capacity of the corresponding user is adjusted by adjusting the spread spectrum sequence length and information rate corresponding to the address code;

[0019] The network manager divides one or more frequency band satellite resources into multiple real-time channels with equal bandwidth using code division multiple access for real-time business communications.

[0020] Furthermore, in step 2, the power control method of the master station transmitting the network access signal is:

[0021] The master station receives the master station network access signal, estimates the signal-to-noise ratio of the master station network access signal and reports it to the network management. The network management calculates the loss of the cooperative communication signal-to-noise ratio caused by the master station network access signal based on the signal-to-noise ratio of the master station network access signal. , the specific calculation method is:

[0022]

[0023] in, is the signal-to-noise ratio of the low-speed signal, The value range is 5dB~6.5dB; is the low signal information rate, The value range is 300bps~2.4kbps; is the low-speed signal bandwidth, The value range is 2MHz~18MHz; is the error correction caused by signal processing, The value range is 0dB~1dB;

[0024] The network management shall determine the signal-to-noise ratio loss of the cooperative communication signal according to the agreement between the network management and the partner. , adjust the transmission power of the master station.

[0025] Furthermore, in step 3, the power control method of the small base station transmitting the network access signal is:

[0026] The master station receives the small station network access signal, estimates the signal-to-noise ratio of the small station network access signal and reports it to the network management. The network management calculates the loss of the cooperative communication signal-to-noise ratio caused by the small station network access signal based on the signal-to-noise ratio of the small station network access signal. , the specific calculation method is:

[0027]

[0028] in, is the signal-to-noise ratio of the low-speed signal, The value range is 5dB~6.5dB; is the number of CDMA low-speed signal paths, The value range of is 1 to 8; is the low signal information rate, The value range is 300bps~2.4kbps; is the low-speed signal bandwidth, The value range is 2MHz~18MHz; is the error correction caused by signal processing, The value range is 0dB~1dB;

[0029] The network management shall determine the signal-to-noise ratio loss of the cooperative communication signal according to the agreement between the network management and the partner. , adjust the transmission power of the small station.

[0030] Furthermore, in step 3, the frequency correction method of the small base station transmitting the network access signal is:

[0031] The master station receives the master station network access signal and estimates the frequency deviation of the master station uplink and downlink And send it to the small station through the main station network access signal;

[0032] The small station receives the main station network access signal and estimates the frequency deviation of the small station receiving the main station network access signal , and analyze the frequency deviation of the master station uplink and downlink ;

[0033] In order to reduce the impact of clock jitter on system frequency calibration and improve the stability of frequency deviation compensation, the small station and After smoothing, the frequency correction value of the small station network access signal is calculated , and make real-time compensation for the transmission frequency of the small station; the small station transmission frequency compensation method is:

[0034]

[0035] in, is the frequency change multiple of the small station uplink, is the frequency change multiple of the small station downlink;

[0036] During system operation, the system clock source will drift, causing the system frequency deviation to change. Therefore, the master station needs to track the frequency deviation in real time and perform real-time correction.

[0037] Furthermore, in step 4, the method of networking communication is:

[0038] The master station and the small stations realize mesh network communication or star network communication with one master station and multiple small stations. The master station and the small stations directly carry out two-way communication; the small stations communicate with each other through forwarding by the master station;

[0039] The master station and the small station package the business data to be sent into data frames through multiple layers of station number layer, port layer, user layer, and type layer, and then send them to the channel; each station in the network filters the received data frames layer by layer, parses the frames with the same station number, port number, user number, and type number in the frame header, and retains them, while other frames are discarded.

[0040] Compared with the background technology, the present invention has the following advantages:

[0041] (1) The present invention transmits low-rate signals and cooperative signals of satellite transponders in the same frequency band, thereby improving the utilization efficiency of satellite transponders and meeting the demand for emergency communications when dedicated satellite resources cannot be applied for.

[0042] (2) The present invention integrates frequency / time / code / packet systems in multiple dimensions and multiple addresses, allocates transmission bandwidth on demand according to user communication needs, and realizes networking communication under low-speed channel conditions, meeting the needs of multiple users for concurrent communication, real-time business communication, and non-real-time business communication.

[0043] (3) The present invention addresses the problem that traditional TDMA requires protection time slots and combines time division multiple access with code division multiple access, thereby solving the problem of mutual influence between two time slot signals after a TDMA time slot collision and improving the time slot transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of satellite networking communications based on cooperative signals.

[0045] Figure 2 It is a schematic diagram of multi-dimensional multi-access fusion based on frequency / time / code, etc.

[0046] Figure 3 It is a schematic diagram of efficient multiple access fusion based on time / code, etc.

[0047] Figure 4 This is a schematic diagram of a packet-based multi-layer multiple access network. DETAILED DESCRIPTION

[0048] The present invention will be further described below in conjunction with the accompanying drawings.

[0049] A low-speed user multi-dimensional multi-address networking communication method for efficient use of satellite resources comprises the following steps:

[0050] Step 1: Based on the number of users and communication service requirements, the network management plans the satellite transponder resources used in the communication process; the satellite transponder resources are used as follows:

[0051] The satellite transponder is a transparent satellite transponder, and the communication frequency band is the Ku band; there is a signal on the transponder that can cooperate with the communication; during the use of satellite resources, the loss of the signal-to-noise ratio of the cooperative communication signal caused by the low-speed communication signal is less than dB, is the value agreed with the satellite company;

[0052] The network manager divides the satellite transponder frequency resources into multiple frequency bands;

[0053] The network management divides satellite resources of one or more frequency bands into network control time slots and service time slots in a time division multiple access manner for small stations to access the network and non-real-time service communications. The number and position of network control time slots and service time slots can be adjusted dynamically; each time slot supports multiple address codes for code division multiple access communications, and the communication capacity of the corresponding user is adjusted by adjusting the spread spectrum sequence length and information rate corresponding to the address code;

[0054] The network manager divides one or more frequency band satellite resources into multiple real-time channels with equal bandwidth using code division multiple access for real-time business communications.

[0055] Step 2: The master station transmits a network access signal to the satellite, and the master station receives the network access signal forwarded by the satellite. The power control method of the network access signal transmitted by the master station is:

[0056] The master station receives the master station network access signal, estimates the signal-to-noise ratio of the master station network access signal and reports it to the network management. The network management calculates the loss of the cooperative communication signal-to-noise ratio caused by the master station network access signal based on the signal-to-noise ratio of the master station network access signal. , the specific calculation method is:

[0057]

[0058] in, is the signal-to-noise ratio of the low-speed signal, The value range is 5dB~6.5dB; is the low signal information rate, The value range is 300bps~2.4kbps; is the low-speed signal bandwidth, The value range is 2MHz~18MHz; To correct errors caused by signal processing, etc. The value range is 0dB~1dB;

[0059] The network management shall determine the signal-to-noise ratio loss of the cooperative communication signal according to the agreement between the network management and the partner. , adjust the transmission power of the master station.

[0060] Step 3: The small station transmits a network access signal to the satellite, and the main station receives the network access signal of the small station forwarded by the satellite; the power control method of the network access signal transmitted by the small station is:

[0061] The master station receives the small station network access signal, estimates the signal-to-noise ratio of the small station network access signal and reports it to the network management. The network management calculates the loss of the cooperative communication signal-to-noise ratio caused by the small station network access signal based on the signal-to-noise ratio of the small station network access signal. , the specific calculation method is:

[0062]

[0063] in, is the signal-to-noise ratio of the low-speed signal, The value range is 5dB~6.5dB; is the number of CDMA low-speed signal paths, The value range of is 1 to 8; is the low signal information rate, The value range is 300bps~2.4kbps; is the low-speed signal bandwidth, The value range is 2MHz~18MHz; To correct errors caused by signal processing, etc. The value range is 0dB~1dB;

[0064] The network management shall determine the signal-to-noise ratio loss of the cooperative communication signal according to the agreement between the network management and the partner. , adjust the transmission power of the small station.

[0065] The frequency correction method for the small station to transmit the network signal is as follows:

[0066] The master station receives the master station network access signal and estimates the frequency deviation of the master station uplink and downlink And send it to the small station through the main station network access signal;

[0067] The small station receives the main station network access signal and estimates the frequency deviation of the small station receiving the main station network access signal , and analyze the frequency deviation of the master station uplink and downlink ;

[0068] In order to reduce the impact of clock jitter on system frequency calibration and improve the stability of frequency deviation compensation, the small station and After smoothing, the frequency correction value of the small station network access signal is calculated , and make real-time compensation for the transmission frequency of the small station; the small station transmission frequency compensation method is:

[0069]

[0070] in, is the frequency change multiple of the small station uplink, is the frequency change multiple of the small station downlink;

[0071] During system operation, the system clock source will drift, causing the system frequency deviation to change. Therefore, the master station needs to track the frequency deviation in real time and perform real-time correction.

[0072] Step 4: After the master station and the small station are connected to the network, the master station and the small station transmit service communication signals to perform low-speed networking communication; the method of networking communication is:

[0073] The power control method of the business communication signal transmitted by the master station and the small station is the same as that of the network access signal; the frequency correction method of the business communication signal transmitted by the small station and the network access signal is the same;

[0074] The master station and the small stations realize mesh network communication or star network communication with one master station and multiple small stations. The master station and the small stations directly carry out two-way communication; the small stations communicate with each other through forwarding by the master station;

[0075] The master station and the small station package the business data to be sent into data frames through multiple layers of station number layer, port layer, user layer, and type layer, and then send them to the channel; each station in the network filters the received data frames layer by layer, parses the frames with the same station number, port number, user number, and type number in the frame header, and retains them, while other frames are discarded.

[0076] The main innovations of the present invention are as follows:

[0077] (1) Design for efficient utilization of satellite resources

[0078] Apply to satellite companies for satellite transponder resources for cooperative communications.

[0079] like Figure 1 As shown, the network manager divides the satellite transponder frequency resources into multiple unit frequency bands; plans the number of satellite resources to be allocated based on the current network capacity and business needs; and plans the satellite resources occupied by the forward link and return link.

[0080] The forward link refers to the link from the main station to the small station; the reverse link refers to the link from the small station to the main station.

[0081] After the low-rate information is spread by direct sequence, it occupies a unit frequency band satellite resource and is transmitted in the same frequency band as one or more cooperative signals that are communicating on the transparent satellite transponder.

[0082] The master station transmits a low-speed forward link signal, receives a forward link signal, estimates the signal-to-noise ratio of the forward link signal and reports it to the network management. The network management calculates the impact of the forward link signal on the signal-to-noise ratio of the cooperative signal based on the signal-to-noise ratio of the forward link signal, and the impact of the low-speed signal on the signal-to-noise ratio of the cooperative signal. Calculation method:

[0083]

[0084] in is the signal-to-noise ratio of the low-speed signal, is the low signal information rate, is the low-speed signal bandwidth, Correction for errors caused by signal processing and temperature changes.

[0085] According to the cooperative signal performance loss agreed with the partner, the network manager adjusts the transmission power of the master station.

[0086] After receiving the forward link signal, the small station transmits a low-speed return link signal. The master station receives the return link signal, estimates the signal-to-noise ratio of the return link signal and reports it to the network management. The network management calculates the impact of the return link signal on the signal-to-noise ratio of the cooperative signal based on the signal-to-noise ratio of the return link signal; the impact of the low-speed signal on the signal-to-noise ratio of the cooperative signal Calculation method:

[0087]

[0088] in is the signal-to-noise ratio of the low-speed signal, is the number of CDMA low-speed signal paths, is the low signal information rate, is the low-speed signal bandwidth, Correction for errors caused by signal processing and temperature changes.

[0089] According to the cooperative signal performance loss agreed with the partner, the network manager adjusts the transmission power of the small base station.

[0090] (2) Non-real-time channel design based on frequency / time multiple access fusion

[0091] like Figure 2 As shown, the network manager divides the satellite resources of one or more unit frequency bands into network control time slots and service time slots in a time division multiple access manner for the network access of small stations and non-real-time business communications. The number and position of network control time slots and business time slots can be adjusted dynamically. Small stations access the network through network control time slots, and apply for satellite resources according to business needs after access. If it is a non-real-time business, the network manager allocates one or more business time slots to the small station based on the current remaining time slot resources. The network manager notifies the small station of the number of time slots, time slot positions, and time slot references allocated to each small station through the forward link. After receiving the time slot reference, the small station starts timing. When the timing reaches the network control time slot or business time slot allocated by the network manager, the network control frame or business frame is sent.

[0092] According to the network capacity and communication capability requirements, the network manager plans multiple unit frequency band satellite resources as non-real-time channels in the form of time slots, and each small station can only be allocated time slots within the same unit frequency band. In general, the network manager will adopt the principle of equal distribution and evenly distribute all time slots to the small stations that have already joined the network; if there are small stations that have withdrawn from the network or newly joined the network, the network manager will reallocate the time slots evenly. For small stations with special needs, the network manager can pre-allocate a certain number of time slots for the small station, and other small stations will evenly distribute the remaining time slots. In order to reduce the collision probability of small stations using network control time slots, the network control time slots are grouped based on the ALOHA method. Each group shares a network control time slot. The small stations in the group randomly use the allocated network control time slots before joining the network. After joining the network, they will only use the network control time slots after receiving inquiries from the network manager.

[0093] (3) Real-time channel design based on frequency / code multiple access fusion

[0094] like Figure 2As shown in the figure, the network manager divides one or more unit frequency band satellite resources into multiple real-time channels with equal bandwidth in a code division multiple access manner, which are called unit real-time channels and are used for real-time business communications such as voice. According to business requirements, the network manager divides real-time channels into normalized duty channels and business-triggered channels. For normalized duty channels, the network manager allocates address codes and communication frequencies to the master station and small stations that need to communicate. The small stations can initiate business communications at any time. The master station is always on duty and can receive business from the small stations at any time. For business-triggered channels, the master station and small stations that need to communicate apply for business through the network control time slot. After the application is successful, the network manager allocates address codes and communication frequencies to the communicating parties according to the remaining conditions of the real-time channels; after the business communication is completed, the network manager recovers the allocated address codes and communication frequencies. If the bandwidth of a unit real-time channel cannot meet the communication requirements, the network manager can merge multiple unit real-time channels into a channel with a wider bandwidth by adjusting the length of the address code and the information rate.

[0095] (4) Efficient design based on time / code multi-access fusion

[0096] like Figure 2 , Figure 3 As shown in the figure, the network manager assigns the time slot reference information and the time slot starting address code number at the same time. The small station uses the time slot reference information as the starting point for timing. Every time a time slot passes, the address code number changes. When it reaches the time slot assigned by the network manager, it communicates with the corresponding code word number. The main station uses the same time slot reference as the starting point for timing, and receives the data of the first time slot with the first numbered address code. After the time slot ends, the address code is switched synchronously when the time slot is switched. Unlike the small station, the main station needs to receive data from all time slots. Different time slots use different address codes. In this way, at the location where the time slots collide, code division multiple access is used to reduce mutual interference between different time slots, thereby improving the receiving performance of the time slot collision part. The use of time / code multiple access fusion avoids the problem of the traditional TDMA system requiring a large protection time slot, and improves the communication efficiency of users.

[0097] (5) Packet-based multi-layer, multi-access, multi-type networking design

[0098] The communication technology based on the main station receiving secondary transmission, multi-layer packaging and multi-dimensional addressing is adopted to realize mesh network communication or star network communication with one main station and multiple small stations.

[0099] The low-speed network supports a certain network capacity, and each station in the network can communicate with each other. The main station and the small station package the business data to be sent into data frames through the station number layer, port layer, user layer, and type layer, and then send them to the channel; each station in the network filters the received data frames layer by layer, parses the frames with the same station number, port number, user number, and type number in the frame header, and retains them, while other frames are discarded.

[0100] The main station sends data packets to the small station through the forward link, and the small station sends data packets to the main station through the return link. After the main station receives the data packet from the small station, it parses the packet. If the destination station of the data packet is the small station, the main station sends the data packet to each small station through the forward link; after each small station receives the packet forwarded by the main station, it parses the packet and extracts the data of its own station number, thereby realizing communication between the small stations.

[0101] like Figure 4 As shown in the figure, station 1 multiplexes and packages the data and sends it to stations 2 and 3 via the satellite channel; after station 2 receives the data packet, it only parses out the data information of station 2 and discards the data information of station 3; similarly, after station 3 receives the data packet, it only parses out the data information of station 3 and discards the data information of station 2. For the packet parsed as this station, after further parsing, the packet belonging to which port is sent to the corresponding port.

[0102] (6) Design of joint large-scale frequency deviation correction for forward and return links

[0103] In order to reduce the impact of system frequency deviation and improve the transmission efficiency of the system, a system frequency correction method based on forward link frequency deviation estimation and return link real-time correction is designed. The master station estimates the frequency deviation of the master station uplink and downlink by transmitting and receiving forward link signals. and sends it to the small station through the forward link; the small station receives the forward link signal and estimates the frequency deviation of the received forward link , and analyze the frequency deviation of the master station uplink and downlink ; In order to reduce the impact of clock jitter on system frequency calibration and improve the stability of frequency deviation compensation, the small station and After smoothing, the return link signal frequency correction value is calculated , and perform real-time compensation on the intermediate frequency sending frequency of the small station terminal.

[0104]

[0105] in, is the frequency change multiple of the small station uplink, It is the frequency change multiple of the downlink of the small station. During the operation of the system, the system clock source will drift, causing the system frequency deviation to change. Therefore, the master station small station tracks the frequency deviation in real time and compensates to eliminate the impact of the frequency deviation.

[0106] In summary, the present invention performs co-band communication based on satellite transponder cooperative signals. When dedicated satellite resources cannot be applied for due to a shortage of satellite resources, emergency satellite communications are performed by using satellite transponders through the cooperation of low-speed signals with the existing communication signals of the transponder.

[0107] The present invention improves the utilization efficiency of satellite resources while controlling the transmission power of low-speed signals to reduce the impact of high-speed signals on cooperative signals. The invention utilizes multi-dimensional multi-address fusion design based on frequency division multiple access, time division multiple access, code division multiple access, packet division multi-layer multiple access, etc. to realize the networking communication of low-speed users and the parallel communication of multiple users and multiple services, improve the transmission efficiency of TDMA time slots, design a joint large-scale frequency deviation correction method for forward and return links, and reduce the synchronization overhead of the return link.

[0108] The present invention is applicable to emergency low-speed communication needs. When satellite resources are in short supply and dedicated satellite resources cannot be applied for, an emergency communication network can be established using space visible transparent satellites for communication.

Claims

1. A low-speed user multi-dimensional multi-address networking communication method for efficient use of satellite resources, characterized in that: The following steps are involved: Step 1: According to the number of users and communication service requirements, the network management plans the satellite transponder resources used in the communication process; wherein the satellite transponder is a transparent satellite transponder, and the communication frequency band is the Ku band; there is a signal on the transponder that can be used for cooperative communication; during the use of satellite resources, the loss of the signal-to-noise ratio of the cooperative communication signal caused by the low-speed communication signal is less than dB, is the value agreed with the satellite company; The network manager divides the satellite transponder frequency resources into multiple frequency bands; The network management divides satellite resources of one or more frequency bands into network control time slots and service time slots in a time division multiple access manner for small stations to access the network and non-real-time service communications. The number and position of network control time slots and service time slots can be adjusted dynamically; each time slot supports multiple address codes for code division multiple access communications, and the communication capacity of the corresponding user is adjusted by adjusting the spread spectrum sequence length and information rate corresponding to the address code; The network management divides one or more frequency band satellite resources into multiple real-time channels with equal bandwidth in a code division multiple access manner for real-time business communications; After the low-rate information is spread by direct sequence, it occupies a unit frequency band satellite resource and is transmitted in the same frequency band as one or more signals that can cooperate with each other in communication on the transparent satellite transponder; Step 2: The master station transmits a network access signal to the satellite, and the master station receives the master station network access signal forwarded by the satellite; Step 3: The small station transmits a network access signal to the satellite, and the main station receives the small station network access signal forwarded by the satellite; Step 4: After the master station and the small station are connected to the network, the master station and the small station transmit business communication signals to carry out low-speed networking communication.

2. The low-speed user multi-dimensional multi-address networking communication method for efficient utilization of satellite resources according to claim 1, characterized in that: In step 2, the power control method of the master station transmitting the network access signal is: The master station receives the master station network access signal, estimates the signal-to-noise ratio of the master station network access signal and reports it to the network management. The network management calculates the loss of the cooperative communication signal-to-noise ratio caused by the master station network access signal based on the signal-to-noise ratio of the master station network access signal. , the specific calculation method is: in, is the signal-to-noise ratio of the low-speed signal, The value range is 5dB~6.5dB; is the low signal information rate, The value range is 300bps~2.4kbps; is the low-speed signal bandwidth, The value range is 2MHz~18MHz; is the error correction caused by signal processing, The value range is 0dB~1dB; The network management shall determine the signal-to-noise ratio loss of the cooperative communication signal according to the agreement between the network management and the partner. , adjust the transmission power of the master station.

3. The low-speed user multi-dimensional multi-address networking communication method for efficient utilization of satellite resources according to claim 1, characterized in that: In step 3, the power control method of the small station transmitting the network access signal is: The master station receives the small station network access signal, estimates the signal-to-noise ratio of the small station network access signal and reports it to the network management. The network management calculates the loss of the cooperative communication signal-to-noise ratio caused by the small station network access signal based on the signal-to-noise ratio of the small station network access signal. , the specific calculation method is: in, is the signal-to-noise ratio of the low-speed signal, The value range is 5dB~6.5dB; is the number of CDMA low-speed signal paths, The value range of is 1 to 8; is the low signal information rate, The value range is 300bps~2.4kbps; is the low-speed signal bandwidth, The value range is 2MHz~18MHz; is the error correction caused by signal processing, The value range is 0dB~1dB; The network management shall determine the signal-to-noise ratio loss of the cooperative communication signal according to the agreement between the network management and the partner. , adjust the transmission power of the small station.

4. The low-speed user multi-dimensional multi-address networking communication method for efficient utilization of satellite resources according to claim 1, characterized in that: In step 3, the frequency correction method for the small station to transmit the network access signal is: The master station receives the master station network access signal and estimates the frequency deviation of the master station uplink and downlink And send it to the small station through the main station network access signal; The small station receives the main station network access signal and estimates the frequency deviation of the small station receiving the main station network access signal , and analyze the frequency deviation of the master station uplink and downlink ; In order to reduce the impact of clock jitter on system frequency calibration and improve the stability of frequency deviation compensation, the small station and After smoothing, the frequency correction value of the small station network access signal is calculated , and make real-time compensation for the transmission frequency of the small station; the small station transmission frequency compensation method is: in, is the frequency change multiple of the small station uplink, is the frequency change multiple of the small station downlink; During system operation, the system clock source will drift, causing the system frequency deviation to change. Therefore, the master station needs to track the frequency deviation in real time and perform real-time correction.

5. The low-speed user multi-dimensional multi-address networking communication method for efficient utilization of satellite resources according to claim 1, characterized in that: In step 4, the method of networking communication is: The master station and the small stations realize mesh network communication or star network communication with one master station and multiple small stations. The master station and the small stations directly carry out two-way communication; the small stations communicate with each other through forwarding by the master station; The master station and the small station package the service data to be sent into data frames through the station number layer, port layer, user layer, and type layer, and then send them to the channel; Each station in the network filters the received data frames layer by layer, parses the frames with the same station number, port number, user number and type number in the frame header and retains them, while discarding other frames.

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