WO2023279481A1

WO2023279481A1 - Satellite networking system, satellite networking method, and communication method

Info

Publication number: WO2023279481A1
Application number: PCT/CN2021/112920
Authority: WO
Inventors: 李玮; 顾捷; 吴继平
Original assignee: 南京中网卫星通信股份有限公司
Priority date: 2021-07-06
Filing date: 2021-08-17
Publication date: 2023-01-12
Also published as: CN113328792A; CN113328792B

Abstract

Provided in the present invention are a satellite networking system, a satellite networking method, and a communication method. The satellite networking system comprises at least one high-orbit satellite, at least two low-orbit satellites, which are connected to the high-orbit satellite, a plurality of pseudo satellites and feeder terminals, which are arranged on the ground, and a pseudo satellite monitoring station and a control center, which are respectively connected to the pseudo satellites and the feeder terminals, wherein the low-orbit satellites comprise a central low-orbit satellite and a plurality of common low-orbit satellites, and the common low-orbit satellites are in communication connection with the central low-orbit satellite in a code division multiple access modulation manner. By means of the present invention, a plurality of satellite networking modes are realized, and an optimal networking mode is selected, such that the time delay of satellite networking is effectively reduced, and the reliability of satellite networking is improved.

Description

A satellite networking system, networking method and communication method

technical field

The present invention relates to the technical field of communication, in particular, to a satellite networking system, a networking method and a communication method.

Background technique

With the rapid development of satellite communication technology, more and more satellite communication devices have been widely used. Satellite communication uses the transponder of the satellite as a relay station to forward radio waves to realize communication between two or more earth stations. Satellite communication has the characteristics of seamless coverage, wide coverage, long communication distance, stable communication lines, communication frequency bandwidth, and large capacity. As the expansion, extension, supplement and backup of land mobile communication, it is widely used in remote areas, rural areas, and mountainous areas. , islands, disaster areas, and ocean-going fleets and long-distance aircraft and other areas where land communications are not easily covered.

However, when the existing satellite communication is close to the transmission terminal, it is greatly affected by the surrounding environment. For example, in complex environments such as indoors, mines, and tunnels, the signal quality of satellite communication is low, which cannot meet the needs of large-scale user terminals. need.

Contents of the invention

In view of the above problems, the present invention provides a satellite networking system, a networking method and a communication method.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

In a first aspect, the present invention provides a satellite networking system, including at least one high-orbit satellite, at least two low-orbit satellites connected to the high-orbit satellite, a plurality of pseudolites and feeder terminals arranged on the ground, and A pseudolite monitoring station and a control center respectively connected to the pseudolite and the feeder terminal; multiple low-orbit satellites form a ring structure network, a mesh structure network or a master-slave structure network to communicate with each other.

As a preferred solution, when a plurality of low-orbit satellites form a master-slave structure, the low-orbit satellites are divided into a central low-orbit satellite and a plurality of common low-orbit satellites, and the common low-orbit satellites use code division multiple The address modulation mode is connected with the center low-orbit satellite communication; the code division multiple access modulation mode is to distribute an address code on the carrier wave sent by each common low-orbit satellite at the same time and in the same frequency band to carry out spread spectrum processing, and the center low-orbit satellite receives the carrier Perform despreading processing on it.

In a second aspect, the present invention provides a satellite networking method, comprising the steps of: obtaining the working parameters of a plurality of preset satellites, the preset satellites including high-orbit satellites, low-orbit satellites and pseudolites; Parameter calculation The characteristic parameters of preset satellites in different networking modes, wherein the characteristic parameters at least include network connectivity parameters, network cost parameters and communication quality parameters; weighted summation and sorting are performed on the characteristic parameters to obtain evaluation Index; select a corresponding networking mode according to the evaluation index, and perform networking on multiple preset satellites.

As a preferred solution, the networking method includes: a ring structure network, a mesh structure network and a master-slave structure network, and each structure network is divided into two types according to whether it includes pseudolites.

As a preferred solution, in the networking mode including the pseudolite, the pseudolite communicates with the user terminal in a time division multiple access manner.

In a third aspect, the present invention provides a communication method for a satellite networking system, which is used to realize communication between two user terminals, including the following steps: the low-orbit satellite A receives a task request sent by the user terminal A, and the task request includes; Send out the address of user terminal A and receive the address of user terminal B; use the addresses of user terminal A and user terminal B to calculate the distance between the two user terminals; select and forward the task request to the high-orbit satellite A or the feeder terminal according to the distance A; when the task request is forwarded to the high-orbit satellite A, the high-orbit satellite A transmits the task request to the high-orbit satellite B through the inter-satellite link, and then transmits the task request to the user terminal B through the low-orbit satellite B connected to the high-orbit satellite B; when After the task request is forwarded to the feeder terminal A, it is transmitted to the feeder terminal B through the control center, and then transmitted to the user terminal B through the low-orbit satellite B connected to the feeder terminal B.

As a preferred solution, when an abnormality occurs in the communication between the low-orbit satellite and the user terminal, a pseudolite link is established between the low-orbit satellite and the user terminal to realize reliable communication.

Compared with the prior art, the beneficial effects of the present invention include: setting up a plurality of pseudolites and feeder terminals on the ground, establishing communication links between pseudolites and low-orbit satellites, and feeder terminals and low-orbit satellites, realizing A variety of satellite networking methods, and by calculating the characteristic parameters of the preset satellites in different networking methods, the evaluation index is obtained to select the optimal networking method, which effectively reduces the delay of satellite networking and improves satellite networking. reliability. When the distance between the user terminal and the pseudolite is relatively short, since the power of the signal received by the user terminal from the pseudolite is much greater than the power of the low-orbit satellite, the user terminal cannot receive the signal from the low-orbit satellite. The signal is sent out in the pulse time slot, and no signal is sent out in other time periods. The signal does not exist or only has a small amount of overlap with the low-orbit satellite in the time domain, which effectively reduces the interference between signals.

Description of drawings

The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are only for illustration purposes, and are not intended to limit the protection scope of the present invention. In the drawings, the same reference numerals are used to refer to the same parts. in:

FIG. 1 is a schematic structural diagram of a satellite networking system according to an embodiment of the present invention;

FIG. 2 is a schematic flowchart of a satellite networking method according to an embodiment of the present invention;

FIG. 3 is a schematic flowchart of a communication method of a satellite networking system according to an embodiment of the present invention.

detailed description

It is easy to understand that, according to the technical solution of the present invention, those skilled in the art can propose multiple structural modes and implementation modes that can be replaced without changing the essence and spirit of the present invention. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the entirety of the present invention or as a limitation or restriction on the technical solution of the present invention.

An embodiment according to the present invention is shown in conjunction with FIG. 1 . The invention provides a satellite networking system, comprising at least one high-orbit satellite, at least two low-orbit satellites connected to the high-orbit satellite, a plurality of pseudolites and feeder terminals arranged on the ground, and connected to pseudolites and feeder terminals respectively. The pseudolite monitoring station and control center connected to the terminal; the low-orbit satellite includes a central low-orbit satellite and multiple ordinary low-orbit satellites. The ordinary low-orbit satellites are connected to the central low-orbit satellites by code division multiple access modulation.

It should be understood that a high-orbit satellite refers to a geosynchronous orbit communication satellite, which has the advantage of wide coverage. Low-orbit satellites refer to low-orbit satellite systems, which have the advantages of short transmission delay and small path loss.

In the embodiment of the present invention, a communication link is established between the ordinary low-orbit satellite and the center low-orbit satellite, and the code division multiple access modulation method is to assign an address code on the carrier wave sent by each ordinary low-orbit satellite at the same time and in the same frequency band. Spread spectrum processing, the central low-orbit satellite receives the carrier and despreads it, so that each ordinary low-orbit satellite transmits to the central low-orbit satellite and does not interfere with each other during transmission.

Referring to Fig. 2, the present invention provides a kind of satellite networking method, comprises the following steps:

S101. Obtain working parameters of a plurality of preset satellites, where the preset satellites include high-orbit satellites, low-orbit satellites, and pseudolites.

S102. Calculate characteristic parameters of preset satellites in different networking modes according to the working parameters, wherein the characteristic parameters at least include network connectivity parameters, network cost parameters and communication quality parameters.

In the embodiment of the present invention, the networking method includes: a ring structure network, a mesh structure network and a master-slave structure network, and each structure network is divided into two types according to whether it includes pseudolites.

Specifically, in a ring structure network, a plurality of low-orbit satellites form a ring structure, each low-orbit satellite is in an equal state, and a low-orbit satellite establishes a channel with an adjacent low-orbit satellite to complete communication. In the mesh structure network, multiple low-orbit satellites form a mesh structure, each low-orbit satellite is in an equal state, and the low-orbit satellite establishes a channel with any other low-orbit satellite to complete communication. In the master-slave structure network, the low-orbit satellite includes a central low-orbit satellite and multiple ordinary low-orbit satellites, and the communication between ordinary satellites is mainly completed through the control and forwarding of the central low-orbit satellite.

In the networking mode including pseudolite, when the user terminal is close to the pseudolite, the user terminal cannot receive the low-orbit satellite signal because the signal power received by the user terminal from the pseudolite is much greater than the power of the low-orbit satellite. The satellite uses time division multiple access to communicate with the user terminal. Under the control and management of the same time synchronization system of the network, each pseudolite node accesses the channel in the assigned time slot to forward data. By adopting the time division multiple access method, the pseudolite only sends out a signal in a specific pulse time slot, and does not send out a signal in other time periods. The signal does not exist or has only a small amount of overlap with the low-orbit satellite in the time domain, effectively reducing the interference between signals.

S103. Perform weighted summation and sorting of the characteristic parameters to obtain an evaluation index.

S104. Select a corresponding networking mode according to the evaluation index, and perform networking on a plurality of preset satellites.

Referring to Fig. 3, the present invention provides a communication method of a satellite networking system, which is used to realize communication between two user terminals, including the following steps:

S201, the low-orbit satellite A receives a task request sent by the user terminal A, and the task request includes: sending the address of the user terminal A and receiving the address of the user terminal B.

S202. Calculate the distance between the two user terminals by using the addresses of the user terminal A and the user terminal B.

S203. Select and forward the task request to the high-orbit satellite A or the feeder terminal A according to the distance.

S204, after the task request is forwarded to the high-orbit satellite A, the high-orbit satellite A transmits the task request to the high-orbit satellite B through the inter-satellite link, and then transmits the task request to the user terminal B through the low-orbit satellite B connected to the high-orbit satellite B.

S205. After the task request is forwarded to the feeder terminal A, it is transmitted to the feeder terminal B through the control center, and then transmitted to the user terminal B through the low-orbit satellite B connected to the feeder terminal B.

Furthermore, when an abnormality occurs in the communication between the low-orbit satellite and the user terminal, a pseudolite link is established between the low-orbit satellite and the user terminal to realize reliable communication.

In summary, the beneficial effects of the present invention include: setting up a plurality of pseudolites and feeder terminals on the ground, establishing communication links between pseudolites and low-orbit satellites, and feeder terminals and low-orbit satellites, realizing various Satellite networking mode, and by calculating the characteristic parameters of the preset satellites in different networking modes, the evaluation index is obtained to select the optimal networking mode, which effectively reduces the delay of satellite networking and improves the reliability of satellite networking sex. When the distance between the user terminal and the pseudolite is relatively short, since the power of the signal received by the user terminal from the pseudolite is much greater than the power of the low-orbit satellite, the user terminal cannot receive the signal from the low-orbit satellite. The signal is sent out in the pulse time slot, and no signal is sent out in other time periods. The signal does not exist or only has a small amount of overlap with the low-orbit satellite in the time domain, which effectively reduces the interference between signals.

The technical scope of the present invention is not limited to the content in the above description. Those skilled in the art can carry out various deformations and modifications to the above-mentioned embodiments without departing from the technical idea of the present invention, and these deformations and modifications should belong to Within the protection scope of the present invention.

Claims

A satellite networking system, characterized in that it includes at least one high-orbit satellite, at least two low-orbit satellites connected to the high-orbit satellite, a plurality of pseudolites and feeder terminals arranged on the ground, and pseudolites connected to the pseudolites respectively Pseudo-satellite monitoring stations and control centers connected to feeder terminals;

A plurality of low-orbit satellites form a ring structure network, a mesh structure network or a master-slave structure network to communicate with each other.
The satellite networking system according to claim 1, wherein when a plurality of low-orbit satellites form a master-slave structure, the low-orbit satellites are divided into a central low-orbit satellite and a plurality of common low-orbit satellites Satellites, the common low-orbit satellites communicate with the central low-orbit satellites using code division multiple access modulation;

The code division multiple access modulation method is to assign an address code to the carrier sent by each common low-orbit satellite at the same time and in the same frequency band for spread spectrum processing, and the center low-orbit satellite receives the carrier to perform despread spectrum processing.
A satellite networking method, is characterized in that, comprises the steps:

Obtaining working parameters of a plurality of preset satellites, the preset satellites include high-orbit satellites, low-orbit satellites and pseudolites;

Calculate characteristic parameters of preset satellites in different networking modes according to the working parameters, wherein the characteristic parameters at least include network connectivity parameters, network cost parameters and communication quality parameters;

Performing weighted summation and sorting on the characteristic parameters to obtain an evaluation index;

A corresponding networking mode is selected according to the evaluation index, and a plurality of preset satellites are networked.
The satellite networking method according to claim 3, wherein the networking method includes: a ring structure network, a mesh structure network, and a master-slave structure network, and each structure network is classified according to whether pseudolites are included. into two categories.
The satellite networking method according to claim 4, characterized in that, in the networking mode including pseudolites, the pseudolites communicate with user terminals in a time division multiple access manner.
A communication method for a satellite networking system, used to realize communication between two user terminals, is characterized in that it includes the following steps:

The low-orbit satellite A receives the task request sent by the user terminal A, and the task request includes: sending the address of the user terminal A and receiving the address of the user terminal B;

Using the addresses of user terminal A and user terminal B to calculate the distance between the two user terminals;

Select and forward the task request to the high-orbit satellite A or the feeder terminal A according to the distance;

When the task request is forwarded to the high-orbit satellite A, the high-orbit satellite A transmits the task request to the high-orbit satellite B through the inter-satellite link, and then transmits the task request to the user terminal B through the low-orbit satellite B connected to the high-orbit satellite B;

After the task request is forwarded to the feeder terminal A, it is transmitted to the feeder terminal B through the control center, and then transmitted to the user terminal B through the low-orbit satellite B connected to the feeder terminal B.
The communication method of the satellite networking system according to claim 6, wherein when an abnormality occurs in the communication between the low-orbit satellite and the user terminal, a pseudolite link is established between the low-orbit satellite and the user terminal communication.