CN101795493B - Satellite onboard processing exchange system suitable for GEO satellite mobile communication system - Google Patents

Abstract

The invention relates to a satellite onboard processing exchange system suitable for a GEO satellite mobile communication system, which belongs to the technical field of satellite mobile communications. The invention is characterized by comprising a wave beam receiving unit, a feeding chain circuit transmitting unit, a received signal exchange unit, a fixed configuration signal receiving processing unit, a global signal receiving processing unit, a business processing unit, a fixed configuration signal transmitting processing unit, a global signal transmitting processing unit, a transmitted signal processing unit, a feeding chain circuit receiving unit, a satellite onboard control unit, a signal superimposer and a wave beam transmitting unit. The invention enables both sides in the network to complete processing on the satellite, thereby realizing one-hop communications; the internetwork business is transparently transmitted to a ground gateway for direct processing; and optimizing configuration of the resources processed on the satellite is carried out through dynamic configuration by utilizing an extensible nonsymmetrical satellite onboard exchange structure.

Description

An Onboard Processing and Switching System Applicable to GEO Satellite Mobile Communication System

technical field

The invention belongs to the technical field of satellite communication, in particular to an on-board processing and switching system in a satellite mobile communication system.

Background technique

Satellite mobile communication can achieve true global coverage and is an important part of the third generation mobile communication system. Especially in the special case of failure of ground communication means, satellite mobile communication has become the only choice, which was particularly prominent in the Wenchuan earthquake relief in 2008. Satellite mobile communications have played an irreplaceable and important role in major events such as Olympic communication support and the celebration of the 60th anniversary of the founding of the People's Republic of China.

With the development of terrestrial networks, 3G and 4G technologies will become the main technical means of terrestrial communication networks. In order to seamlessly integrate with the terrestrial network, the application of 3G and 4G technologies to satellite mobile communications has gradually become an inevitable development trend. At the same time, the GEO (Geosynchronous Orbit) satellite communication delay is relatively long (single-hop transmission delay ≈ 0.25 seconds), if the traditional double-hop application mode of transparent forwarding on the satellite and processing by the ground center station will result in a delay of 0.5 seconds One-way transmission delay cannot meet the needs of mobile users. Therefore, the GEO satellite mobile communication system must adopt a single-hop communication mode based on on-board processing. However, the resources on the satellite are strictly limited, and the processing complexity of the 3G and 4G communication systems is relatively high. The current satellite payload is not enough to complete the full demodulation of all signals. On the other hand, in the GEO satellite mobile communication system, there are two types of services, intra-network communication and inter-network communication. According to statistics, the intra-network service only accounts for about 10% of the communication services of the entire network, and only the intra-network service needs to be real-time on the satellite. demodulation. In view of this characteristic, the new technology of on-board processing and switching suitable for satellite mobile communication can be used to solve the contradiction between performance requirements and processing capabilities.

The purpose of the present invention is to propose a system in which resources are dynamically configured on a star and transparent forwarding on a star is compatible with processing and switching. The invention realizes the compatibility of two modes of on-star transparent forwarding and on-star processing and switching; designs a special layered and extensible switching structure; adopts a dynamic configuration scheme, and improves the utilization rate of on-star processing resources.

Contents of the invention

The purpose of the present invention is to propose a technical solution for dynamic configuration of on-board resources, transparent forwarding on-board and compatibility of processing and switching. The core idea of the present invention is to realize the collaborative work of on-star transparent forwarding and on-star processing and switching, real-time processing and switching of intra-network services on the star to realize one-hop communication, and transparent forwarding of inter-network services to the ground gateway to complete processing, still only one hop delay hour. The invention designs a special layered and extensible on-star switching structure, and optimizes the configuration of on-star processing resources through dynamic configuration.

The present invention is characterized in that it includes: a beam receiving unit, a feeder link transmitting unit, a receiving signal switching unit, a fixed configuration signal receiving and processing unit, a global signal receiving and processing unit, a service switching unit, a fixed configuration signal transmitting and processing unit, a global signal The transmission processing unit, the signal exchange unit, the feeder link receiving unit, the on-board control unit, the signal superimposer and the beam transmitting unit are all composed of digital integrated circuit chips, among which:

The beam receiving unit is provided with: Y input terminals, forming Y beam channels, each beam contains multiple user data, and inputting all sampled data Y _D of Y beams includes two kinds of sampled data in the network and the Internet, and is provided with : Three output terminals: the first output terminal, Y in total, outputs the data Y _D1 of each channel that does not need to be processed on the star after being judged by the built-in judgment module in the Y _D beam sampling data, and the second channel There are Y output terminals, which output multi-channel data Y _D2 within the processing range of the fixed configuration signal receiving and processing unit after being judged by the decision module in the Y _D beam sampling data, and the third output terminal, There are Y ones, and output the multi-channel data Y _D3 that needs to be processed on the star after being judged by the judgment module in the Y _D beam sampling data, and the remaining multi-channel data that needs to be processed on the satellite is outside the processing capacity of the fixed configuration signal receiving and processing unit. Y _D = Y _D1 + Y _D2 + Y _D3 ; the feeder link transmitting unit has Y data input terminals, which are connected with the first output terminals of the beam receiving unit, and are also provided with: satellite-ground network management control signal command input, in order to forward the multi-channel data Y _D1 to the ground station according to the control signal of the star-ground network management control unit;

There are YP fixedly configured signal receiving and processing units, Y is the total number of beams, P is the number of fixedly configured signal receiving and processing units configured for each beam, and the input from the second output of the beam receiving unit is within the scope of its own processing capability. The second data Y _D2 processed in the network outputs the YP subgrade data;

The receiving signal switching unit, at least one, is provided with Y input terminals, which are respectively connected to the output terminals of the third output terminal in the beam receiving unit, and the receiving signal switching unit adopts a scalable layered switching structure, including: a There are two types of modules, the first-level module and the second-level module, which are realized by digital integrated circuit chips, among which:

M是所述全局信号接收处理单元的个数，设Y_D3是在所述Y_D路采样数据中所述YP个固定配置信号接收处理单元处理能力范围外的用户多路数据中用户的数目，在数值上等于所述用户多路数据的数目，在所述Y个波束通道中传输，第n个所述子一级模块对应的多个波束的采样数据所对应的波束数I＝[Y/N]，在第n个所述子一级模块中：The first-level module contains N sub-level-1 modules, and each sub-level-1 module is formed by connecting a first-level multiplexer and N second-level multiplexers, wherein,

M is the number of the global signal receiving and processing units, and Y _D3 is the number of users in the multi-channel data of users outside the processing capability range of the YP fixed configuration signal receiving and processing units in the YD channel _sampling data, Numerically equal to the number of multi-channel data of the user, transmitted in the Y beam channels, the number of beams corresponding to the sampling data of multiple beams corresponding to the nth sub-level module I=[Y/ N], in the nth sub-level module:

The first-stage multiplexer has only one, and I input terminals are arranged to input the following data respectively: Input _n×1 ,…, Input _n×1 ,…, Input _n×1 , wherein, subscript n represents described The serial number of the first-stage multiplexer, n=1, 2, ..., N, the subscript i represents the serial number of the sampled data in the i-th beam input terminal included in the n-th first-level submodule, There are N in total, and the total number of output terminals is N ² .

表示，N second-stage multiplexers, each second-stage multiplexer has N output terminals corresponding to the first-stage multiplexer, N destination address output terminals, and the N A total of N ² destination address output terminals in the second stage multiplexer, with Road ₁ , Road ₂ , ...,

express,

The secondary module is composed of N sub-secondary modules, and each sub-secondary module is a multiplexer, and each input terminal of each multiplexer is connected to the sub-level N in the sub-level module of the corresponding serial number in the first-level module. Each output end of a second-stage multiplexer is connected, and there are N ² in total, and the whole secondary module inputs N×N ² destination addresses in total, and each is used as the multiplexer n of the sub-secondary module. Output N ² destination addresses, expressed as: Output _1×1 , Output _1×2 ,..., Output _1×n ,...,

The receiving signal exchange unit completes the scheduling of input data according to the following steps, so as to complete the exchange between input data and output data,

Step (1). The nth sub-level module inputs the number of user data in the sampling data in the beam of the total I road,

Step (2). Determine whether X ₁ ≤ Y ₁ exists, where:

X ₁ is the number of user data input to the total I beams of the nth sub-level module in the first level module,

Y ₁ is the number of vacant output ports in the sub-level module corresponding to the nth sub-level module in the second level module, which is numerically equal to the number of destination addresses,

If: X ₁ ≤ Y ₁ , then the first-stage multiplexer in the nth sub-level-1 module directly outputs the number of user data X ₁ in the sampling data in the total I beams, and each A piece of user data includes the destination address, and directly passes through the sub-two corresponding to the serial number of the second-stage multiplexer in the n-th sub-level one module corresponding to the sub-secondary module serial number. level module output,

If: X ₁ >Y ₁ ,

Then: the first-level multiplexer in the first-level module copies the number of user data in the total I beams of k shares to N second-level multiplexers in the first-level module The input terminals of the k second-stage multiplexers corresponding to the sequence in the sequence are forwarded, wherein: 1≤k≤N, the conditional inequality starts to be calculated from the first module, and accumulates downwards in order before the condition of the inequality is not satisfied until the value of k is obtained.

个采样数据，整个二级模块输入信号为N个第Road₁至第

个采样数据，而总输出则有N²个采样数据Output_1×1、Output_1×2、...、Output_1×n、...、

Step (3). The nth sub-level module receives the output of the nth sub-level module from step (2) corresponding to the Input _n×1 , ..., Input _n×1 , .. ., N address signals Road ₁ , Road ₂ ,..., Input _n×1 sampling data After that, directly output the first Output _1×1 , Output _1×2 , ..., Output _1×n , ..., through the N ² output port addresses in one-to-one correspondence,

sampled data, the input signal of the entire secondary module is N road ₁ to road

sampled data, and the total output has N ² sampled data Output _1×1 , Output _1×2 ,..., Output _1×n ,...,

Global signal receiving and processing units, a total of M processing the sampling data input from the receiving signal switching unit into baseband data and then sending it to the business switching unit,

The service switching unit is implemented by a time-division bus, and sends the baseband data received from the fixed configuration signal receiving and processing unit to the fixed configuration signal transmitting unit, and sends the data received from the global signal transmitting and processing unit to the The global signal transmission processing unit,

The fixed configuration signal transmission processing unit is configured with Q units for each beam, a total of YQ units, and sends the received baseband data within the processing capacity of the fixed configuration signal reception processing unit to the signal superimposer,

A global signal transmission processing unit, L in total, sends the baseband data received from the service switching unit to the signaling switching unit,

The signaling switching unit is composed of the first-level and second-level modules of signaling switching in series, wherein:

符号“’”表示为发信号交换单元的分路通过一个加法器后再分别送入一个多路选择器，所述的加法器中，第一个加法器的输出，其中一路送到第二个加法器，第二个加法器的输出其中的一路送到第三个加法器，以此类推，一直到第N²个加法器位置，而第n个所述子一级模块中共N²个输出送到第n+1个所述子一级模块中的第一个加法器，所述多路选择器输出N²个地址信号Road₁、Road₂、...、

直接送到发信号交换单元的二级模块对应子二级模块的各输入端，完成N个N²输入到N个N²输出的交换，The first-level module for signal exchange is composed of N sub-level-one modules, The nth primary switching module has N ² sampled data, expressed as Input' _n×1 ,...,

The symbol "'" indicates that the branch of the signal switching unit is sent to a multiplexer after passing through an adder. In the adder, the output of the first adder is sent to the second An adder, one of the outputs of the second adder is sent to the third adder, and so on until the ^N2th adder position, and the nth sub-level module has a total of ^N2 outputs sent to the first adder in the n+1th sub-level module, and the multiplexer outputs N ² address signals Road ₁ , Road ₂ , . . .

Directly sent to each input terminal of the secondary module corresponding to the sub-secondary module of the signal exchange unit, and completes the exchange of N N ² inputs to N N ² outputs,

1≤K≤N，完成N个N²输入到I′个输出的交换，The secondary module of signaling exchange unit is made of N sub-secondary modules, and the sub-secondary module is also a multiplexer output I ' road sampling data

1≤K≤N, complete the exchange of N N ² inputs to I' outputs,

At the same time, the signaling exchange unit is also an asymmetric structure in which the number of input sampling data channels is greater than the number of output sampling data channels;

The feeder link receiving unit directly sends the one-hop sampling data sent by the ground station to the signal superimposer according to the satellite-ground network management signaling sent by the on-board control unit,

The signal superimposer superimposes the received sampling data of the ground station and the sampling data sent by the signaling switching unit, and sends them to the beam transmitting unit.

Fig. 1 is a schematic diagram of the system structure of the present invention, wherein:

The internal structure of the signaling exchange unit 1 and the receiving signal exchange unit 7 is designed and realized according to a specific scalable hierarchical switching structure, and the specific method is as follows:

求出参数N值，从而得到参数

然后，利用参数N、I设计结构如下：一级模块共N个，每个完成I到N²的交换；二级模块共N个，每个完成N²到N²的交换。其中，一级模块内部结构如图4所示：一级模块内部含有N个N输入N输出的基本交换模块，基本模块可由多路选择器实现，一级模块的输入与基本模块的输入间由多路选择器连接。二级模块由N²输入N²输出的多路选择器实现。最后，确定一级模块的输出与二级模块的输入的连接关系为：第1个一级模块的1至N路输出按顺序分别连接到各个二级模块的第1路输入，第k个一级模块的1至N路输出按顺序分别连接到各个二级模块的第k路输入(1≤k≤n)；第1个一级模块的(m-1)N+1至mN路输出按顺序分别连接到各个二级模块的第(m-1)N+1路输入，第k个一级模块的(m-1)N+1至mN路输出按顺序分别连接到各个二级模块的第(m-1)N+k路输入(1≤k≤N，1≤m≤N)。1. receive signal switching unit structure and realize (Fig. 3): described receiving signal switching unit structure is an asymmetric switching structure, according to Fig. 1 can know that the input of receiving signal switching unit is I road beam, and output is N ³ road data. Since each input beam contains multiple channels of output user data, the number of inputs is smaller than the number of outputs. First, using the formula

Find the value of parameter N, so as to get the parameter

Then, use the parameters N and I to design the structure as follows: a total of N primary modules, each of which completes the exchange from I to ^N2 ; a total of N secondary modules, each of which completes the exchange from ^N2 to ^N2 . Among them, the internal structure of the first-level module is shown in Figure 4: the first-level module contains N basic switching modules with N input and N output, and the basic module can be realized by a multiplexer. multiplexer connection. The secondary module is realized by a multiplexer with ^N2 input and ^N2 output. Finally, determine the connection relationship between the output of the first-level module and the input of the second-level module: the outputs 1 to N of the first first-level module are respectively connected to the first input of each second-level module in sequence, and the k-th one Outputs 1 to N of the first-level module are respectively connected to the k-th input of each second-level module (1≤k≤n) in sequence; (m-1)N+1 to mN outputs of the first first-level module are connected in sequence They are respectively connected to the (m-1)N+1th input of each secondary module in sequence, and the (m-1)N+1 to mN outputs of the kth primary module are connected to the respective secondary modules in sequence. (m-1)N+k-th channel input (1≤k≤N, 1≤m≤N).

The receiving signal exchange unit completes the scheduling of input data according to the following steps, so as to complete the exchange between input data and output data,

Step (1). The number of user data in the sampled data in the total I road beam inputted with n sub-level modules,

Step (2). Determine whether X ₁ ≤ Y ₁ exists, where:

X ₁ is the number of user data input to the total I beams of the nth sub-level module in the first level module,

Y ₁ is the number of vacant output ports in the sub-level module corresponding to the nth sub-level module in the second level module, which is numerically equal to the number of destination addresses,

If: X ₁ ≤ Y ₁ , then the first-stage multiplexer in the nth sub-level one module directly outputs the number of user data X ₁ in the sampling data in the total I beams, and each user The data includes the destination address, and directly passes through the sub-secondary module of the corresponding serial number of the second-stage multiplexer in the nth sub-level one module corresponding to the sub-secondary module serial number output,

If: X ₁ >Y ₁ ,

Y₁，1≤k≤N，该条件不等式从第一个模块开始计算，在该不等式条件未满足前顺序向下累加，直至求出k值，Then: the first-level multiplexer in the first-level module replicates the number of user data in the total I-way beam of k shares to be the same as the N second-level multiplexers in the first-level module The input forwarding ends of the k second-stage multiplexers corresponding to the sequence in the middle, wherein:

Y ₁ , 1≤k≤N, the conditional inequality starts to be calculated from the first module, and accumulates downwards sequentially until the value of k is obtained before the condition of the inequality is not met.

后，一一对应地直接通过N²个输出端口地址输出第Output_1×1、Output_1×2、...、Output_1×n、...、，

个采样数据，整个二级模块输入信号为N个第Road₁至第

个采样数据，而总输出则有N²个采样数据Output_1×1、Output_1×2、...、Output_1×n、...、

Step (3). The nth sub-level module receives the output of the nth sub-level module from step (2) corresponding to the Input _n×1 , ..., Input _n×1 , .. ., N address signals Road ₁ , Road ₂ , ...., Input _n×1 sampling data

After that, directly output the first Output _1×1 , Output _1×2 , ..., Output _1×n , ..., through the N ² output port addresses in one-to-one correspondence,

sampled data, the input signal of the entire secondary module is N road ₁ to road

sampled data, and the total output has N ² sampled data Output _1×1 , Output _1×2 ,..., Output _1×n ,...,

求出参数N，利用公式

求出参数I。将参数N、I代入特定可扩展分层交换结构设计原理图。则：每个一级模块由N个N²输入N²输出的模块组成，完成N²到N²的交换；每个二级模块由N个N²输入I输出的模块组成，完成N²到I的交换。由于发信号交换单元需要将多路数据合并到一路波束内，因此发信号交换单元二级模块(对应于特定可扩展分层交换结构的一级模块)内部结构变更为图5所示。其余结构不变。2. Realization of the structure of the signaling switching unit (FIG. 6): According to FIG. 1, it can be seen that the input of the signaling switching unit is the sampling data from L global signal transmission processing units, and the output is K beams. Since multiple input data of the signaling switching unit is added to one output beam, the switching structure is an asymmetric structure in which the number of inputs is greater than the number of outputs. Therefore, the structure of the switching unit for sending signals adopts the opposite structure of the switching unit for receiving signals. use the formula

To find the parameter N, use the formula

Find the parameter I. Substitute the parameters N and I into the design schematic diagram of a specific scalable layered switching structure. Then: each primary module is composed of N modules with N ² input and N ² output, completing the exchange from N ² to N ² ; each secondary module is composed of N modules with N ² input and I output, completing N ^{2 to N 2} I exchange. Since the signaling switching unit needs to merge multiple channels of data into one beam, the internal structure of the secondary module of the signaling switching unit (corresponding to the primary module of a specific scalable layered switching structure) is changed as shown in FIG. 5 . The rest of the structure remains unchanged.

The signal exchange unit uses the adder inside the first-level module to weight the sampling data of the same target beam to one of the output terminals of the first-level module, and then sends it to the second-level module to which the corresponding output belongs according to the destination address. Then it is sent to the corresponding output terminal according to the destination address.

3. Business switching unit: perform full switching processing on business-level data, which can be realized by using switching structures based on time-division bus, shared memory or Crossbar. Figure 2 is an example of using a time-division bus structure.

The on-star processing and switching system applicable to the GEO satellite mobile communication system of the present invention is realized in the following steps (Fig. 1):

Step (1) The beam receiving unit 9 uses its internal decision device to send the data that does not require on-board processing in the received beam sampling data to the feeder link transmitting unit 11, and the processing capacity of the fixedly configured signal receiving and processing unit The data within the range is sent to the fixed configuration signal receiving and processing unit 2, and the rest of the data that needs to be processed on the star is sent to the receiving signal switching unit 1;

Step (2) The on-star control unit 13 responsible for controlling the feeder link uses the star-ground network management signaling to control the feeder link transmitting unit 11 to directly and transparently forward the received beam sampling data to the ground station;

Step (3) The fixed configuration signal receiving processing unit 2 processes the received sampling data into baseband data and then sends it to the service switching unit 4;

Step (4) receiving signal switching unit 1 exchanges the received sampling data to global signal receiving processing unit 3 and processes it as baseband data and then sends it to service switching unit 4;

Step (5) The service exchange unit 4 sends the baseband data within the processing capacity of the beam internal signal transmission processing unit 5 to the fixed configuration signal transmission processing unit 5 among the received baseband data, and sends other baseband data to the global signal transmission processing Unit 6;

Step (6) The fixed configuration signal transmission processing unit 5 processes the received baseband data into sampling data and then sends it to the signal superimposed device 8, and the global signal transmission processing unit 6 processes the received baseband data into sampling data and then sends it to the transmission signal Exchange unit 7;

Step (7) The signal exchange unit 7 sends the received sampling data to the signal adder 8 after being exchanged according to user requirements;

Step (8) The on-star control unit 13 responsible for controlling the feeder link uses the star-ground network management signaling to control the feeder link receiving unit 12 to directly send the beam sampling data sent by the ground station to the signal superimposer 8;

Step (9) The signal superimposer 8 superimposes the received sampling data into each beam and sends it out.

Compared with prior art, the present invention has following advantage:

1. The present invention realizes the simultaneous support of two modes of digital transparent forwarding and processing switching on the star. There are different processing schemes for different user needs, which not only guarantees the communication quality, but also greatly optimizes the configuration and utilization of on-board resources.

2. The on-board processing part of the present invention uses a layered exchange design to decompose the exchange pressure.

3. A specific extensible layered switching structure is designed, and the switching structure is used to realize the dynamic configuration of on-board processing resources of GEO satellites, reducing the complexity of the on-board structure.

Description of drawings

Figure 1 is a schematic diagram of the GEO satellite on-board switching processing structure

Figure 2 is a schematic diagram of an example of a service switching unit

Figure 3 is a schematic diagram of the receiving signal exchange unit

Figure 4 is a schematic diagram of the internal structure of the first-level module of the receiving signal switching unit

Figure 5 is a schematic diagram of the internal structure of the first-level module of the signaling switching unit

Figure 6 is a schematic diagram of the signaling switching unit

Detailed ways

Below we will further describe in detail specific implementations of the present invention in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

Example 1: The embodiment of the present invention takes the on-board processing and switching structure of the GEO satellite communication system based on 3G technology as an example to illustrate the high-speed on-board processing and switching method of the GEO satellite proposed by the present invention.

Application background: GEO satellite mobile communication system consists of GEO satellite S-band satellite payload, central station (network management center, operation control center), gateway station and various user stations/terminals. The satellite employs a large deployable mesh antenna, producing 100 spot beams. Spot beams meet the needs of handheld terminals for higher G/T (figure of merit) and higher EIRP (equivalent isotropic radiated power).

Functional requirements for on-board exchange preprocessing:

(1) Support two working modes of digital transparency and on-board processing and switching;

(2) Complete the processing of uplink multi-channel signals on the star (receiving raised cosine filter, correlator, PN code generator, channel estimator, phase rotator, delay equalizer and multipath combining module, Viterbi decoding, CRC check );

(3) Complete the processing of downlink multi-channel signals on the satellite (add CRC check digit, 1/3 rate convolution code, OVSF code spread spectrum, QPSK modulation);

(4) At least 10 on-board user services must be guaranteed for each beam, and a maximum of 1330 on-board processing services must be completed simultaneously in the entire network;

(5) The upper limit of the number of IO ports of the basic device is 100.

Utilize system structural diagram (Fig. 1) of the present invention, apply the concrete scheme of the present invention and implement as follows:

1. Design the receiving signal switching unit and the sending signal switching unit:

Set parameters according to functional requirements (4): P=Q=10. And because the number of satellite spot beams is 100, the parameter I=100 is obtained, and then the parameter: M=L=1330-100×10=330 is obtained.

According to the functional requirements (4)(5) and the values of M and N, the design of the switching structure is as follows:

则该结构由7个16输入49输出的一级模块和7个49输入49输出的二级模块构成。模块内部结构及模块间连接根据原理结构实现。该结构交换能力：总交换能力为112输入、343输出。Design of the receiving signal switching structure (Figure 6): According to the characteristics of the receiving signal structure, use the structure shown in Figure 3 to design the receiving signal switching structure, and use the formula to find

Then the structure consists of seven primary modules with 16 inputs and 49 outputs and seven secondary modules with 49 inputs and 49 outputs. The internal structure of the module and the connection between the modules are realized according to the principle structure. The switching capacity of this structure: the total switching capacity is 112 inputs and 343 outputs.

Signal switching structure design (Figure 6): according to the characteristics of the signaling structure, use the formula to find Then the structure consists of seven primary modules with 49 inputs and 49 outputs and seven secondary modules with 49 inputs and 16 outputs. The network structure is opposite to the signal receiving structure. The internal structure of the module and the connection between the modules are realized according to the principle structure. Structural switching capacity: The total switching capacity is 343 for input and 112 for output.

2. Combined with the example background to complete the scheme design (Figure 1):

The beam receiving unit 9 is realized by the S-band multi-beam receiving antenna system (100 beams), the beam transmitting unit 8 is realized by the S-band multi-beam transmitting antenna system (100 beams), and the feed link transmitting unit 11 is realized by the S-band single-beam transmitting antenna System implementation, the feeder link receiving unit 12 is implemented by an S-band single-beam receiving antenna system.

The rest is implemented with FPGA (Xilinx's anti-radiation version FPGA: XQR4VFX60-10CF1144V can be selected). Wherein: the internal logic structure of receiving signal switching unit 1 and sending signal switching unit 7 is realized according to the design in the first part (each first-level and second-level module is formed by a slice of FPGA), and business switching unit 4 is realized by a time-division bus structure, The inside of the signal superimposer 8 can be realized by using a frame synchronization scheme based on the WCDMA common channel. The beam internal signal receiving processing unit 2 and the global signal receiving processing unit 3 can fulfill the functional requirement (2). The beam internal signal transmitting processing unit 5 and the global The signal transmission processing unit 6 internally fulfills the functional requirement (3), and the on-board control unit 13 completes the global control CPU function.

The specific embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and those skilled in the art can make various modifications without departing from the spirit and scope of the claims of the application. modification or modification.

Claims (1)

1. processing and exchanging system on the star that is applicable to GEO (geostationary orbit) satellite mobile communication system; It is characterized in that; Contain: wave beam receiving element, feeding link transmitter unit, collection of letters crosspoint, fixed configurations signal processing unit, overall signal receive control unit, signal superimposer and beam transmission unit on processing unit, operation exchange unit, fixed configurations signal emission processing unit, overall signal's emission processing unit, signalling crosspoint, feeding link receiving element, the star; All constitute by digital integrated circuit chip, wherein:

The wave beam receiving element is provided with: Y input, constitute Y wave beam passage, and each wave beam contains the multichannel user data, whole sampled data Y of Y wave beam of input _DComprise in the net and internet two kinds of sampled datas, be provided with again: three road outputs: first via output, total Y, output is at said Y _DAfter the judgement of built-in judging module, do not need each circuit-switched data Y of on star, handling in the individual wave beam sampled data _D1, the second road output has Y, and output is at said Y _DIn the individual wave beam sampled data after the judgement of said judging module the multichannel data Y in said fixed configurations signal processing unit process range _D2, the Third Road output has Y, and output is at said Y _DAll the other need be the multichannel data Y that handles on the star outside said fixed configurations signal processing unit disposal ability scope after said judging module judgement in the individual wave beam sampled data _D3, said Y _D=Y _D1+ Y _D2+ Y _D3

The feeding link transmitter unit has Y data input, links to each other with each output of the first via of said wave beam receiving element, also is provided with: star earth mat management and control system signaling input so that according to the control signal of star earth mat management and control system unit with multichannel data Y _D1Be forwarded to ground station;

The fixed configurations signal processing unit; Total YP; Y is the wave beam sum, and P is the fixed configurations signal processing unit number of each beam configuration, imports the second circuit-switched data Y that supplies processing in the net in the own disposal ability scope from the second road output of said wave beam receiving element _D2, output YP roadbed band data;

Collection of letters crosspoint; At least one is provided with Y input, links to each other with each output of Third Road output in the said wave beam receiving element respectively; Said collection of letters crosspoint adopts can expand the layering switching fabric; Contain: one-level module and secondary module be totally two generic modules, realize with digital integrated circuit chip, wherein:

The one-level module contains N sub-one-level module, and each sub-one-level module is formed by connecting first order MUX and N second level MUX, wherein,

M is the number that said overall signal receives processing unit, establishes Y _D3Be at said Y _DUser's number in YP extraneous user's multichannel data of fixed configurations signal processing unit disposal ability described in the sampled data of road; Be numerically equal to the number of said user's multichannel data; In said Y wave beam passage, transmit; The pairing numbers of beams I=of sampled data [Y/N] of a plurality of wave beams of n said sub-one-level module correspondence, in n said sub-one-level module:

First order MUX has only one, and I input arranged, and imports following data: Input respectively _{N * 1}, Input _{N * 1}..., Input _{N * 1}, wherein: subscript n is represented the sequence number of said first order MUX, n=1,2 ..., N; Sampled data sequence number in i the wave beam input that subscript i representes to be comprised in n the said one-level submodule, total N, the output sum has N ²It is individual,

N second level MUX, each second level MUX have N N output corresponding to said first order MUX, and N destination address output arranged, and said N second level MUX amounts to total N ²Individual destination address output is used Road ₁, Road ₂...,

Expression,

The secondary module; Constitute by N sub-secondary module; Each sub-secondary module is a MUX, in each input of each MUX and the said one-level module in the sub-one-level module of corresponding sequence number each output of N second level MUX link to each other, amount to N ²Individual, whole secondary module is imported N * N altogether ²Individual destination address, each is as the said MUX n output N of said sub-secondary module ²Individual destination address is expressed as: Output _{1 * 1}, Output _{1 * 2}..., Output _{1 * n}...,

,

Said collection of letters crosspoint is accomplished the scheduling of input data according to the following steps, with the exchange between completion input data and the dateout,

Step (1). said n sub-one-level module input is total to the user data number in the sampled data in the wave beam of I road,

Step (2). differentiate whether there is X ₁≤Y ₁, wherein:

X ₁Be the interior user data number of common I road wave beam that is input to said n sub-one-level module in the said one-level module,

Y ₁Being that said secondary module is interior equals the destination address number in number corresponding to vacant output port number in the said sub-secondary module of said n sub-one-level module,

If: X ₁≤Y ₁, said first order MUX is directly exported the user data number X in the sampled data in the said I road wave beam altogether in then said n the sub-one-level module ₁, said each user data all includes destination address interior, directly through said sub-secondary module output corresponding to the corresponding sequence number of second level MUX in n said n sub-one-level module of said sub-secondary module sequence number,

If: X ₁＞Y ₁,

Then: the first order MUX in the said one-level module duplicates the said interior user data number of I road wave beam that is total to of k part and holds with the input forwarding of k corresponding second level MUX of order in N in the said one-level module the said second level MUX; Wherein:

1≤k≤N; This conditional inquality begins to calculate from first module; Add up downwards at this inequality condition unmet front sequence; Until obtaining the k value

Step (3). said n sub-secondary module receive said n sub-one-level module output that step (2) sends corresponding to said Input _{N * 1}..., Input _{N * 1}..., Input _{N * 1}The N of sampled data address signal Road ₁, Road ₂..., After, directly pass through N correspondingly ²Individual output port address is exported Output _{1 * 1}, Output _{1 * 2}..., Output _{1 * n}...,,

Individual sampled data, whole secondary module input signal are N Road ₁To

Individual sampled data, total output then has N ²Individual sampled data Output _{1 * 1}, Output _{1 * 2}..., Output _{1 * n}...,

Overall signal receives processing unit, delivers to the operation exchange unit after M the sampled data from said collection of letters crosspoint input is treated to base band data altogether,

The operation exchange unit; Realize with time-shared bus; Deliver to said fixed configurations signal transmitter unit to the base band data of receiving from said fixed configurations signal processing unit, deliver to said overall signal emission processing unit to the data of receiving from said overall signal emission processing unit

Fixed configurations signal emission processing unit to each beam configuration Q, amounts to YQ, delivers to said signal superimposer to the base band data in said fixed configurations signal processing unit disposal ability scope that receives,

Overall signal's emission processing unit, L altogether, deliver to the signalling crosspoint to the base band data of receiving from said operation exchange unit,

The signalling crosspoint is in series by the firsts and seconds module that exchanges of signaling, wherein:

The one-level module of the exchange usefulness of signaling is made up of N sub-one-level module,

N said one-level Switching Module has N ²Individual sampled data is expressed as Input ' _{N * 1}...,

Symbol " ' " shunt that is expressed as the signalling crosspoint sends into a MUX respectively after through an adder again; In the described adder; The output of first adder wherein one the tunnel is delivered to second adder, the output of second adder wherein a road deliver to the 3rd adder; By that analogy, until N ²Individual adder position, and be total to N in n said sub-one-level module ²N+1 first adder in the said sub-one-level module delivered in individual output, said MUX output N ²Individual address signal Road ₁, Road ₂...,

, directly deliver to each input of the corresponding sub-secondary module of secondary module of signalling crosspoint, accomplish N N ²Be input to N N ²The exchange of output,

The secondary module of signalling crosspoint is made up of N sub-secondary module, and sub-secondary module also is a MUX output I ' road sampled data

1≤K≤N accomplishes N N ²Be input to the exchange of the individual output of I ',

Simultaneously, said signalling crosspoint also is the unsymmetric structure of an input sampling data way greater than output sampled data way;

The feeding link receiving element is directly delivered to said signal superimposer to the jumping sampled data that ground station sends up according to the star ground webmaster signaling that control unit on the said star sends,

The signal superimposer, the sampled data of sending the ground station's sampled data that receives and signalling crosspoint here superposes, and is sent to the beam transmission unit.

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