CN101335564B - TDMA method, server and system for VSAT station - Google Patents
TDMA method, server and system for VSAT station Download PDFInfo
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Abstract
本发明公开了一种VSAT站时分多址的方法、服务器和系统，属于卫星通信领域。所述方法包括：为VSAT站设置一个信道时隙；当所述VSAT站接收到发送数据请求时，所述VSAT站读取系统时钟，得到第一时间点，判断所述第一时间点是否在所述信道时隙内，如果在所述信道时隙内，则允许发送所述数据；否则，阻止发送所述数据。所述服务器包括：设置模块和第一处理模块。所述系统包括：服务器、卫星调制解调器、室外单元和天线；本发明实现了多个VSAT站共用一个卫星信道，并且在无需主站的情况下实现时分多址，具有设备简单、造价低廉、当地球站数目不多时性价比较高等特点。
The invention discloses a time division multiple access method, server and system of a VSAT station, belonging to the field of satellite communication. The method includes: setting a channel time slot for the VSAT station; when the VSAT station receives a request to send data, the VSAT station reads the system clock to obtain a first time point, and judges whether the first time point is in In the channel time slot, if it is in the channel time slot, the data is allowed to be sent; otherwise, the data is prevented from being sent. The server includes: a setting module and a first processing module. The system includes: a server, a satellite modem, an outdoor unit and an antenna; the invention realizes that a plurality of VSAT stations share one satellite channel, and realizes time division multiple access without a master station, and has the advantages of simple equipment, low cost, local When the number of stations is small, the cost performance is relatively high.
Description
技术领域 technical field
本发明涉及卫星通信领域，特别涉及一种VSAT站时分多址的方法、服务器和系统。The invention relates to the field of satellite communication, in particular to a method, server and system for time division multiple access of a VSAT station.
背景技术 Background technique
VSAT(Very Small Aperture Terminal，甚小口径终端)是指一类具有甚小口径天线的、非常廉价的智能化小型或微型地球站，可以方便地安装在用户处。VSAT卫星通信网一般是由大量VSAT小站与一个主站协同工作，共同构成的一个广域稀路由(站多，各站业务量小)的卫星通信网。利用VSAT用户数据终端可直接和计算机联网，完成数据传递、文件交换、图像传输等通信任务，从而摆脱了远距离通信地面中断站的问题，使用VSAT作为专用远距离通信系统是一种很好的选择。VSAT (Very Small Aperture Terminal, Very Small Aperture Terminal) refers to a type of very cheap intelligent small or micro earth station with a very small aperture antenna, which can be easily installed at the user's place. The VSAT satellite communication network generally consists of a large number of VSAT small stations and a main station working together to form a satellite communication network with wide-area sparse routing (many stations and small traffic volume of each station). The VSAT user data terminal can be directly connected to the computer network to complete communication tasks such as data transmission, file exchange, and image transmission, thereby getting rid of the problem of long-distance communication ground interruption stations. Using VSAT as a dedicated long-distance communication system is a good solution choose.
多址技术的目的是为了让不同用户使用同一信道。按照信号空间划分的方法分为时分多址，频分多址，码分多址，空分多址等。按照信道分配方法分成固定多址，竞争多址，预约多址等。The purpose of multiple access technology is to allow different users to use the same channel. According to the method of signal space division, it is divided into time division multiple access, frequency division multiple access, code division multiple access, space division multiple access and so on. According to the channel allocation method, it can be divided into fixed multiple access, contention multiple access, reserved multiple access, etc.
在现行的使用TDMA(Time Division Multiple Access，时分多址)的VSAT网中，所有的VSAT站在卫星内占有的整个时间间隔称为帧，每个VSAT站占有的时隙叫子帧。子帧之间留有一定的时间间隔防止重叠。由主站发射基准子帧，其他地球站发射的子帧的周期要和基准子帧相同，发射时间要互相错开。保证各子帧的高度同步需要主站提供标准时钟和标准频率，所以具有设备复杂、造价高昂及当地球站数目不多时性价比不高等缺点。In the current VSAT network using TDMA (Time Division Multiple Access, Time Division Multiple Access), the entire time interval occupied by all VSAT stations in the satellite is called a frame, and the time slot occupied by each VSAT station is called a subframe. There is a certain time interval between subframes to prevent overlapping. The master station transmits the reference subframe, and the periods of the subframes transmitted by other earth stations should be the same as the reference subframe, and the transmission times should be staggered from each other. To ensure the high degree of synchronization of each subframe requires the master station to provide a standard clock and standard frequency, so it has the disadvantages of complex equipment, high cost, and low cost performance when the number of earth stations is small.
发明内容 Contents of the invention
为了在不需要主站提供标准时钟情况下，实现VSAT站时分多址，本发明实施例提供了一种VSAT站时分多址的方法、服务器和系统。所述技术方案如下：In order to realize the time division multiple access of the VSAT station without the master station providing a standard clock, the embodiment of the present invention provides a method, server and system for the time division multiple access of the VSAT station. Described technical scheme is as follows:
一方面，本发明实施例提供了一种VSAT站时分多址的方法，所述方法包括：On the one hand, an embodiment of the present invention provides a method for time division multiple access of a VSAT station, the method comprising:
为VSAT站设置一个信道时隙；Set a channel time slot for the VSAT station;
当所述VSAT站接收到发送数据请求时，所述VSAT站读取系统时钟，得到第一时间点，判断所述第一时间点是否在所述信道时隙内，如果在所述信道时隙内，则允许发送所述数据；否则，阻止发送所述数据；When the VSAT station receives the request to send data, the VSAT station reads the system clock to obtain the first time point, and judges whether the first time point is in the channel time slot, if in the channel time slot within, the data is allowed to be sent; otherwise, the data is prevented from being sent;
在允许发送所述数据之后，所述VSAT站把所述数据发送给所述VSAT站的卫星调制解调器，并设置一个小的时间段，每隔所述一个小的时间段，读取所述系统时钟，得到第二时间点，判断所述第二时间点是否在所述信道时隙内，如果在所述信道时隙内，则继续发送所述数据；否则，阻止发送所述数据。After allowing to send the data, the VSAT station sends the data to the satellite modem of the VSAT station, and sets a small time period, and reads the system clock every described a small time period , to obtain a second time point, judge whether the second time point is within the channel time slot, if it is within the channel time slot, continue to send the data; otherwise, stop sending the data.
另一方面，本发明实施例还提供了一种VSAT站时分多址的服务器，所述服务器包括：On the other hand, the embodiment of the present invention also provides a VSAT station time division multiple access server, and the server includes:
设置模块，用于为VSAT站设置一个信道时隙；A setting module is used to set a channel time slot for the VSAT station;
第一处理模块，用于所述设置模块为VSAT站设置信道时隙后，当所述VSAT站接收到发送数据请求时，读取系统时钟，得到第一时间点，判断所述第一时间点是否在所述信道时隙内，如果在所述信道时隙内，则允许发送所述数据；否则，阻止发送所述数据；The first processing module is used for after the setting module sets the channel time slot for the VSAT station, when the VSAT station receives the data transmission request, reads the system clock, obtains the first time point, and judges the first time point Whether it is within the channel time slot, if it is within the channel time slot, the data is allowed to be sent; otherwise, the data is prevented from being sent;
第二处理模块，用于所述第一处理模块允许发送所述数据后，把所述数据发送给所述VSAT站的卫星调制解调器，并设置一个小的时间段，每隔所述一个小的时间段，读取所述系统时钟，得到第二时间点，判断所述第二时间点是否在所述信道时隙内，如果在所述信道时隙内，则继续发送所述数据；否则，阻止发送所述数据。The second processing module is used for the first processing module to send the data to the satellite modem of the VSAT station after the first processing module allows sending the data, and set a small time period, every a small time section, read the system clock, get the second time point, judge whether the second time point is within the channel time slot, if it is within the channel time slot, continue to send the data; otherwise, prevent Send the data.
另一方面，本发明实施例还提供了一种VSAT站时分多址的系统，所述系统包括服务器、卫星调制解调器、室外单元和天线；On the other hand, the embodiment of the present invention also provides a VSAT station time division multiple access system, the system includes a server, a satellite modem, an outdoor unit and an antenna;
所述服务器包括：The servers include:
设置模块，用于为VSAT站设置一个信道时隙；A setting module is used to set a channel time slot for the VSAT station;
第一处理模块，用于所述设置模块为VSAT站设置信道时隙后，当所述VSAT站接收到发送数据请求时，读取系统时钟，得到第一时间点，判断所述第一时间点是否在所述信道时隙内，如果在所述信道时隙内，则允许发送所述数据；否则，阻止发送所述数据；The first processing module is used for after the setting module sets the channel time slot for the VSAT station, when the VSAT station receives the data transmission request, reads the system clock, obtains the first time point, and judges the first time point Whether it is within the channel time slot, if it is within the channel time slot, the data is allowed to be sent; otherwise, the data is prevented from being sent;
第二处理模块，用于所述第一处理模块允许发送所述数据后，把所述数据发送给所述VSAT站的卫星调制解调器，并设置一个小的时间段，每隔所述一个小的时间段，读取所述系统时钟，得到第二时间点，判断所述第二时间点是否在所述信道时隙内，如果在所述信道时隙内，则继续发送所述数据；否则，阻止发送所述数据；The second processing module is used for the first processing module to send the data to the satellite modem of the VSAT station after the first processing module allows sending the data, and set a small time period, every a small time section, read the system clock, get the second time point, judge whether the second time point is within the channel time slot, if it is within the channel time slot, continue to send the data; otherwise, prevent send said data;
所述卫星调制解调器，用于对中频载波进行调制；The satellite modem is used to modulate the intermediate frequency carrier;
所述室外单元，用于把所述卫星调制解调器调制的所述中频载波变换为射频信号；The outdoor unit is used to convert the intermediate frequency carrier modulated by the satellite modem into a radio frequency signal;
所述天线，用于把所述室外单元的射频信号经功率放大后发向卫星。The antenna is used to amplify the radio frequency signal of the outdoor unit and send it to the satellite.
本发明实施例提供的技术方案的有益效果是：The beneficial effects of the technical solution provided by the embodiments of the present invention are:
通过为VSAT站设置一个信道时隙，并且通过VSAT站自带的时钟代替主站提供时钟，实现了多个VSAT站共用一个卫星信道，并且在无需主站的情况下实现时分多址，具有设备简单、造价低廉、当地球站数目不多时性价比较高等特点。By setting a channel time slot for the VSAT station, and using the clock provided by the VSAT station instead of the master station to provide the clock, multiple VSAT stations share a satellite channel, and realize time division multiple access without the master station, with equipment Simple, low cost, and high cost performance when the number of earth stations is small.
附图说明 Description of drawings
图1是本发明实施例1提供的VSAT站时分多址的方法流程图；Fig. 1 is the method flowchart of the time division multiple access of VSAT station that embodiment 1 of the present invention provides;
图2是本发明实施例2提供的VSAT站时分多址的服务器结构图；Fig. 2 is the server structural diagram of the VSAT station time division multiple access that the embodiment of the present invention 2 provides;
图3是本发明实施例3提供的VSAT站时分多址的系统结构图。Fig. 3 is a system structure diagram of time division multiple access of a VSAT station provided by Embodiment 3 of the present invention.
具体实施方式 Detailed ways
为使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明实施方式作进一步地详细描述。In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
本发明实施例提供了一种VSAT站时分多址的方法，具体包括：为VSAT站设置一个信道时隙；当VSAT站接收到发送数据请求时，VSAT站读取系统时钟，得到第一时间点，判断第一时间点是否在信道时隙内，如果在信道时隙内，则允许发送数据；否则，阻止发送数据。The embodiment of the present invention provides a method for time division multiple access of a VSAT station, which specifically includes: setting a channel time slot for the VSAT station; when the VSAT station receives a request to send data, the VSAT station reads the system clock to obtain the first time point , judging whether the first time point is within the channel time slot, if it is within the channel time slot, allowing data to be sent; otherwise, preventing data from being sent.
本发明实施例中多个VSAT站共用一个卫星信道，为了使同一个时刻最多只有一个VSAT站向卫星发送数据，为每个VSAT站设置一个信道时隙。每个VSAT站均具有服务器、卫星modem(调制解调器)、ODU(outdoor unit，室外单元)、天线。In the embodiment of the present invention, multiple VSAT stations share one satellite channel. In order to make at most one VSAT station send data to the satellite at the same time, a channel time slot is set for each VSAT station. Each VSAT station has a server, a satellite modem (modem), an ODU (outdoor unit, outdoor unit), and an antenna.
本发明实施例以一个VSAT站向卫星发送数据为例进行说明，当有多个VSAT站向卫星发送数据时，通过设置各个VSAT站的信道时隙，使各个VSAT站的信道时隙均无重复，从而使同一个时刻最多只有一个VSAT站向卫星发送数据，其发送过程详见实施例所述。The embodiment of the present invention takes a VSAT station sending data to a satellite as an example for illustration. When multiple VSAT stations send data to a satellite, the channel time slots of each VSAT station are set so that the channel time slots of each VSAT station are not repeated. , so that at most one VSAT station can send data to the satellite at the same time, and the sending process can be seen in the embodiment.
例如一个VSAT站的信道时隙设置为早上10:00到11:00，其他的VSAT站的信道时隙就不可以设置在这个区间任何一个时间段了。For example, the channel time slot of a VSAT station is set from 10:00 to 11:00 in the morning, and the channel time slots of other VSAT stations cannot be set in any time period of this interval.
实施例1Example 1
参见图1，为本发明实施例提供的一种VSAT站时分多址的方法，具体包括：Referring to Fig. 1, a kind of VSAT station time division multiple access method that the embodiment of the present invention provides, specifically comprises:
101：在VSAT站服务器的控制软件中，为VSAT站设置一个信道时隙，例如：早上10:00到11:00。为了保证数据有充分的时隙完整地发送出去，信道时隙一般设置在30分钟以上，并且只要多个VSAT站信道时隙之间没有冲突，VSAT站信道时隙可以自由更改。101: In the control software of the VSAT station server, set a channel time slot for the VSAT station, for example: 10:00 to 11:00 in the morning. In order to ensure that the data has sufficient time slots to be sent out completely, the channel time slots are generally set at more than 30 minutes, and as long as there is no conflict between the channel time slots of multiple VSAT stations, the channel time slots of the VSAT stations can be changed freely.
102：当VSAT站接收到发送数据请求时，VSAT站中的服务器读取服务器的系统时钟，得到第一时间点，然后查询输入控制软件的设置中的信道时隙，根据查询到的信道时隙，服务器判断第一时间点是否在信道时隙内，如果在信道时隙内，则执行103；否则，执行105。102: When the VSAT station receives the request to send data, the server in the VSAT station reads the system clock of the server to obtain the first time point, and then inquires the channel time slot in the setting of the input control software, according to the inquired channel time slot , the server judges whether the first time point is within the channel time slot, and if it is within the channel time slot, go to step 103; otherwise, go to step 105.
例如：VSAT站中的服务器读取服务器的系统时钟，得到第一时间点是早上10:30，然后查询输入控制软件的设置中的信道时隙是早上10:00到11:00，服务器判断第一时间点在信道时隙内。For example: the server in the VSAT station reads the system clock of the server, and the first time point is 10:30 in the morning, and then inquires and inputs the channel time slot in the setting of the control software as 10:00 to 11:00 in the morning, and the server judges the first A point in time is within a channel slot.
103：服务器允许发送数据，把数据发送给卫星modem并启用一个定时器，定时器根据实际应用需要已设置一个小的时间段(如1秒)，每过一个小的时间段服务器读取其系统时钟，并判断是否在信道时隙内，如果在信道时隙内则执行104；否则，执行105。103: The server allows to send data, send the data to the satellite modem and enable a timer, the timer has set a small time period (such as 1 second) according to the actual application needs, and the server reads its system every time a small time period passes Clock, and judge whether it is in the channel time slot, if it is in the channel time slot, go to 104; otherwise, go to 105.
本实施例中，卫星modem具备PAMA(Pulse Address Multiple Access，脉冲地址多路存取)on demand功能，当一段时间没有IP数据包送到其RJ45接口时会自动关闭载波，释放信道。In this embodiment, the satellite modem has the PAMA (Pulse Address Multiple Access) on demand function, and when no IP packet is sent to its RJ45 interface for a period of time, it will automatically close the carrier and release the channel.
104：服务器继续发送数据给卫星modem，卫星modem对中频载波进行调制，ODU把中频载波变换为射频信号，射频信号经功率放大，由天线把射频信号发向卫星，然后结束。104: The server continues to send data to the satellite modem, the satellite modem modulates the IF carrier, the ODU converts the IF carrier into a radio frequency signal, the radio frequency signal is amplified by power, the radio frequency signal is sent to the satellite by the antenna, and then ends.
105：阻止发送数据，然后结束。105: Block sending data, then end.
本发明实施例通过为VSAT站设置一个信道时隙，并且通过VSAT站自带的时钟代替主站提供时钟，实现了多个VSAT站共用一个卫星信道，并且在无需主站的情况下实现时分多址，具有设备简单、造价低廉、当地球站数目不多时性价比较高等特点。In the embodiment of the present invention, by setting a channel time slot for the VSAT station, and using the clock provided by the VSAT station instead of the master station to provide the clock, multiple VSAT stations share a satellite channel, and realize time-division multiplexing without the master station. It has the characteristics of simple equipment, low cost, and high cost performance when the number of earth stations is small.
实施例2Example 2
参见图2，为本发明实施例提供的一种VSAT站时分多址的服务器，具体包括：Referring to Fig. 2, a kind of server of VSAT station time division multiple address provided for the embodiment of the present invention, specifically comprises:
设置模块，用于为VSAT站设置一个信道时隙；A setting module is used to set a channel time slot for the VSAT station;
第一处理模块，用于所述设置模块为VSAT站设置信道时隙后，当所述VSAT站接收到发送数据请求时，所述VSAT站读取系统时钟，得到第一时间点，判断所述第一时间点是否在所述信道时隙内，如果在所述信道时隙内，则允许发送所述数据；否则，阻止发送所述数据。The first processing module is used for after the setting module sets the channel time slot for the VSAT station, when the VSAT station receives a request to send data, the VSAT station reads the system clock, obtains the first time point, and judges the Whether the first time point is within the channel time slot, if it is within the channel time slot, the data is allowed to be sent; otherwise, the data is prevented from being sent.
进一步地，图2所示的服务器还包括：Further, the server shown in Figure 2 also includes:
第二处理模块，用于所述第一处理模块允许发送所述数据后，把所述数据发送给所述VSAT站的卫星调制解调器，并设置一个小的时间段，每隔所述一个小的时间段，读取所述系统时钟，得到第二时间点，判断所述第二时间点是否在所述信道时隙内，如果在所述信道时隙内，则继续发送所述数据；否则，阻止发送所述数据。The second processing module is used for the first processing module to send the data to the satellite modem of the VSAT station after the first processing module allows sending the data, and set a small time period, every a small time section, read the system clock, get the second time point, judge whether the second time point is within the channel time slot, if it is within the channel time slot, continue to send the data; otherwise, prevent Send the data.
本发明实施例通过为VSAT站设置一个信道时隙，并且通过VSAT站自带的时钟代替主站提供时钟，实现了多个VSAT站共用一个卫星信道，并且在无需主站的情况下实现时分多址，具有设备简单、造价低廉、当地球站数目不多时性价比较高等特点。In the embodiment of the present invention, by setting a channel time slot for the VSAT station, and using the clock provided by the VSAT station instead of the master station to provide the clock, multiple VSAT stations share a satellite channel, and realize time-division multiplexing without the master station. It has the characteristics of simple equipment, low cost, and high cost performance when the number of earth stations is small.
实施例3Example 3
参见图3，为本发明实施例提供的一种VSAT站时分多址的系统，具体包括：服务器、卫星调制解调器、室外单元和天线；Referring to FIG. 3 , a VSAT station time division multiple access system provided by an embodiment of the present invention specifically includes: a server, a satellite modem, an outdoor unit, and an antenna;
所述服务器包括：The servers include:
设置模块，用于为VSAT站设置一个信道时隙；A setting module is used to set a channel time slot for the VSAT station;
第一处理模块，用于所述设置模块为VSAT站设置信道时隙后，当所述VSAT站接收到发送数据请求时，所述VSAT站读取系统时钟，得到第一时间点，判断所述第一时间点是否在所述信道时隙内，如果在所述信道时隙内，则允许发送所述数据；否则，阻止发送所述数据；The first processing module is used for after the setting module sets the channel time slot for the VSAT station, when the VSAT station receives a request to send data, the VSAT station reads the system clock, obtains the first time point, and judges the Whether the first time point is within the channel time slot, if it is within the channel time slot, the data is allowed to be sent; otherwise, the data is prevented from being sent;
第二处理模块，用于所述第一处理模块允许发送所述数据后，把所述数据发送给所述VSAT站的卫星调制解调器，并设置一个小的时间段，每隔所述一个小的时间段，读取所述系统时钟，得到第二时间点，判断所述第二时间点是否在所述信道时隙内，如果在所述信道时隙内，则继续发送所述数据；否则，阻止发送所述数据；The second processing module is used for the first processing module to send the data to the satellite modem of the VSAT station after the first processing module allows sending the data, and set a small time period, every the small time section, read the system clock, get the second time point, judge whether the second time point is within the channel time slot, if it is within the channel time slot, continue to send the data; otherwise, prevent send said data;
所述卫星调制解调器，用于对中频载波进行调制；The satellite modem is used to modulate the intermediate frequency carrier;
所述室外单元，用于把所述卫星调制解调器调制的所述中频载波变换为射频信号；The outdoor unit is used to convert the intermediate frequency carrier modulated by the satellite modem into a radio frequency signal;
所述天线，用于把所述室外单元的射频信号经功率放大后发向卫星。The antenna is used to amplify the radio frequency signal of the outdoor unit and send it to the satellite.
本发明实施例通过为VSAT站设置一个信道时隙，并且通过VSAT站自带的时钟代替主站提供时钟，实现了多个VSAT站共用一个卫星信道，并且在无需主站的情况下实现时分多址，具有设备简单、造价低廉、当地球站数目不多时性价比较高等特点。In the embodiment of the present invention, by setting a channel time slot for the VSAT station, and using the clock provided by the VSAT station instead of the master station to provide the clock, multiple VSAT stations share a satellite channel, and realize time-division multiplexing without the master station. It has the characteristics of simple equipment, low cost, and high cost performance when the number of earth stations is small.
以上实施例提供的技术方案中的全部或部分内容可以通过软件编程实现，其软件程序存储在可读取的存储介质中，存储介质例如：计算机中的硬盘、光盘或软盘。All or part of the technical solutions provided by the above embodiments can be realized by software programming, and the software program is stored in a readable storage medium, such as a hard disk, an optical disk or a floppy disk in a computer.
以上所述仅为本发明的较佳实施例，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.
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| US5867490A (en) * | 1996-11-05 | 1999-02-02 | Worldspace International Network, Inc. | Direct radio broadcast receiver for providing frame synchronization and correlation for time division multiplexed transmissions |
| CN1223039A (en) * | 1997-04-09 | 1999-07-14 | Ge基本太空网络服务公司 | Methods and apparatus for controlling earth-station transmitted power in VSAT network |
| CN1378348A (en) * | 2001-03-28 | 2002-11-06 | 日本电气株式会社 | Satellite communication transmission system and small global station |
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| US5867490A (en) * | 1996-11-05 | 1999-02-02 | Worldspace International Network, Inc. | Direct radio broadcast receiver for providing frame synchronization and correlation for time division multiplexed transmissions |
| CN1223039A (en) * | 1997-04-09 | 1999-07-14 | Ge基本太空网络服务公司 | Methods and apparatus for controlling earth-station transmitted power in VSAT network |
| CN1378348A (en) * | 2001-03-28 | 2002-11-06 | 日本电气株式会社 | Satellite communication transmission system and small global station |
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