CN1032563C - 卫星蜂窝状电话和数据通信系统 - Google Patents
卫星蜂窝状电话和数据通信系统 Download PDFInfo
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Abstract
本发明系统允许用手持移动式蜂窝状电话进行通信,允许在地面上任何地方或地面上空离地几百海里的高空上进行双向通信。该系统采用围绕地球旋转的大量低地球轨道卫星,从这些卫星上直接对用户提供链路,并通过公共交换电话网对其他的用户提供链路。这些卫星通过链路相互连接,形成围绕地球的环路结构。交换由每颗卫星来实施。此外,每颗卫星当它运转离开特定用户所在的区域时,它将该用户的呼叫切换出去。
Description
本发明涉及全球移动通信,尤其涉及卫星蜂窝状电话和数据通信系统。
现有的通信卫星的通信系统允许进行点对点的通信。也就是,卫星的作用好象一个中断站或者一条“弯曲管道”。该卫星从地球上某一地点接收信息,并把此信息发送到地球上另一个固定地点。
这样的点对点的卫星通信系统之一发布在4,720,873号美国专利中。这种系统通过一颗卫星进行多路点对点的通信,它使用于传送蜂窝状节目的广告。
在一个卫星通信系统的一些卫星内,可提供某些基本的复用功能。这种系统之一发布在4,480,328号美国专利中,这个专利讲述了一种卫星通信系统,该系统中,卫星是一个时分多址方式的复用数据中断站。
上述系统和其它系统都讲述了采用单颗卫星进行一点到另一点的通信。这类卫星系统中,在大量用户之间不进行数据的选择或交换。
因此,本发明的目的是要提供一种全球的低地球轨道多路卫星蜂窝状通信系统,它直接接通大量蜂窝状电话和配备有数据传输的用户,也可将这些用户连接到公共交换电话网(PSTN)上。
为达到本发明的目的,推出了一种新型的卫星蜂窝状电话和数据通信系统。
卫星蜂窝状电话通信系统可在大量用户之间建立起通信。这种卫星通信系统包括有位于低地球轨道上的卫星交换器。由无线通信链路将用户连接到该卫星交换器。该卫星交换器在选定的一些用户之间建立起通信链路。
每个用户的当前地址由卫星判定;并使该系统的存储周期地更新。然后,卫星将这些地址转发给专有的基础数据库予以存储。当一个移动用户发出呼叫时,在邻近空间内的卫星就处理这个呼叫。当一个移动用户被呼叫时,卫星交换器通过相应的卫星将这个呼叫发送到被呼叫用户的当时地址处。其它的用户特有数据也可存储在同样的这些数据库存储器位置上。
图1表明本发明的卫星交换系统结构的布局图。
图2是示明卫星交换单元与其所属的移动用户间的连接以及连接到公共交换电话网上的方框图。
图3是全球性蜂窝状卫星交换用的服务区域规划平面图。
图4是卫星蜂窝状通信系统用的数据库布置方框图。
参看图1,它是用于卫星蜂窝状电话通信系统的卫星组合布局。在这个组合布局里,在地球的低轨道位置上有许多卫星,其中在每个轨道平面上放置了多个卫星。如图所示,有着几个卫星轨道平面(3至8号),它个实际上是高度倾斜的,这为整个地球提供出可交换的覆盖。
这种卫星蜂窝状结构有点类似于目前的蜂窝状移动电话系统。在那种系统中,蜂窝状位置是固定的,而用户是可移动的。当用户从一个网孔位置移动到另一个网孔位置时,他的电话通话就从一个网孔交换单元切换到另一个网孔交换单元。
在本发明中,各个卫星单元是不断运转的,而在任一给定时间下各用户是相对地固定的,它们即为各网孔。借助于手持式或者移动式蜂窝状电话接通图1所示的卫星交换单元之一时,是将手持移动式电话或遥控固定电话直接连接到最近的一个卫星交换单元上来实现的。每颗卫星在绕地球运转。当本来为某一特定用户起交换单元作用的那颗卫星离开该交换网孔时,该用户的呼叫就切换到合适的相邻网孔上。相邻网孔可以是同一颗卫星内的一些网孔,或者是位于一个特定轨道平面或一个相邻轨道平面内的其他卫星的网孔。用户可以漫游,但这种漫游距离与卫星交换单元的移动距离相比是相当小的。
与蜂窝状移动电话系统相类似,卫星蜂窝状通信系统提高了频谱交率。这意味着相同的频率可同时供不同的卫星交换单元使用。卫星交换单元和用户之间的空间集提高了频谱效率。
用户可以处在陆地上、海洋中的任何地方,或者处在高度低于低地球轨道卫星的空间。例如,在一块陆地上的人可以与另一块陆地上、船上或飞机上的人通道。
在此系统中,可采用低功率的手持移动式或固定式无线电话。按现有技术,功率要求低于10瓦。
在此系统中,所示的每颗卫星是一个交换单元。目前的卫星通信系统主要起中继站或“弯曲管道”作用。也就是,它们提供出固定的点对点的通信。本发明中,在每颗轨道卫星内提供出交换功能。
如上述所述,在本发明的优选实施例中,卫星的每个轨道平面是高度倾斜的。较低地倾斜的卫星轨道平面也能工作。然而,实现对全球的覆盖时,较低地倾斜比之高度倾斜的卫星轨道结构需要更多的卫星交换单元和/或较高的轨道高度。
在优选实施例也即高度倾斜的轨道结构中,可以发现,采用48颗低地球轨道卫星可满意地实现全球覆盖。这些卫星可布置成6个高度倾斜的轨道平面,每个平面上有8颗卫星。也可以采用其它的构成。采用另外的低倾斜轨道布置时,将需要多得多的卫星来使之与高度倾斜结构式有相同的全球覆盖。
每颗卫星包含下列几部分:一个卫星交换单元,一些合适的天线11(例如,上行/下行链路用的螺旋天线和交叉链路用的透镜天线),太阳能电池非折叠阵列12,以及连接到太阳能电池为交换单元提供电能的存储蓄电池(图中未画出)。卫星运载舱或飞行器本身例如是那些可供商用的低地球轨道卫星,它们由发射火箭送入轨道。卫星进入轨道后,本阳能电池阵列打开,于是对交换单元供电。通过标准的遥测、跟踪和控制信道,使卫星分别地上线运行以构成网络。
如图1所示,备有手持式电话机的用户A挂电话时,对信道的这一通信请求由图中的一颗特定的卫星1接收。将一个频道分配给该用户,通过系统把呼叫者所拨的号码按路由发送出去。每颗卫星是一个分配于本地的信息处理机,它决定如何交换此呼叫。卫星1把该呼叫或是交换到它自已网孔组内的合适网孔上,或是交换到合适卫星的网孔组上。由每个卫星切换单元确定通话路径,直至该呼叫被卫星2接收到。然后卫星2按路由将该呼叫发送到图1中所示的特定的手持式电话机用户B。
虽然图中示出了两个手持式电话机用户,但用户可以在海洋上、在行驶的车辆内,在飞机中,或是通过长途台链路的公共交换电话网的一部分。每颗卫星是一个本地信息处理机,由系统确定将呼叫交换到那个合适的卫星或网孔上。每颗卫星确定出从它本身到下一颗合适卫星的一个最佳通路。这些决定可以是根据被呼叫用户电话号码中的支局代码部分作出的。
一般,每颗卫星可在地球上投身射出4个或者更多个波瓣,因而包含有4个或更多个相应的网孔以共交换。这些波瓣的有效覆盖是通过天线(通常为螺旋天线)来实现的,它们具有与波瓣数相适应的固定的波束宽度。应用本蜂窝状技术,重叠的网孔可以被区分开。图3示出关于地球卫星的一个特定轨道平面上的这类区域或波瓣。此图示出了一个高度倾斜轨道卫星的蜂窝状交换单元。每颗卫星确定出从它本身到下一颗卫星的最佳通路,特定的呼叫或数据传输通过此最佳通路发送。这些卫星交换单元以数据包进行工作,因此可以传输数字声或数据。下行线路和上行线路的数据/数字声按频分多路方式接收,经解调后组成数据包,供卫星对卫星的通信使用。
图2示明一个卫星轨道平面上一部分的相互连接。此外,示出了卫星到该卫星相应的移动用户的连接和卫星到公共交换电话网的连接,图中示出了三颗卫星,即卫星40、卫星50和卫星60。卫星40通过链路i与卫星50相连接,卫星50通过链i+1与卫星60相连接,卫星60通过链路i+2连接到该卫星轨道平面上后一序号的卫星(未画出),卫星40通过链路i-1连接到前一序号的卫星(未画出)。每个卫星轨道平面形成一个围绕地球被连接的卫星环路。
如上所述,图2示出了一个卫星轨道平面。此外,每颗卫星与其它一些轨道平面上的一颗或几颗卫星相连接。也就是,每颗卫星连接到它本身轨道平面内的前一颗和后一颗卫星,也连接到其它一些轨道平面内的一颗或几颗卫星。
卫星之间的链路即链路i-1、莲路i等的组成可通过微波线路或激光线路的数据传输来实现。现有技术广泛地提供出这种数据传送。
卫星与其移动用户之间的连接通过,例如,波束j-1和j+1来实现。这些波束对应于图3中所示的波瓣,并对应于上述的交换网孔。这些波束由卫星上行/下行线路的天线给出。通过用户的全向天线由卫星波束向用户提供通信。在同一时刻一个特定卫星可以容纳的用户数目的限制,取决于卫星分配到的带宽和可用的功率。通常,每颗卫星可容纳50,000个用户。
如图所示,卫星40通过波束j-1连接到一个中继站或长途台10。任意一颗卫星,例如卫星40,能与一个长途台例如长途台10进行数据收发。类似于卫星到卫星的链路,这个长途台链路可按数据包形式组成。
长途台10包括有连接到公共交换电话网20的一些单元。所有的公共交换电话网用户30都连接到该公共交换电话网20。由于卫星40通过长途台10连接到公共交换电话网20,所以经由一个波束直接与卫星连接的卫星蜂窝状系统中的移动用户可通过卫星结构网(经由相应链路的卫星到卫星)发送声音或数据,通过长途台10和公共交换电话网20来接通选定的公共交换电话网用户30,或者实现相反的接通。
每颗卫星提供出几个数据发射波束。这些数据发射波束投射出图3中示明的几个覆盖波瓣,图中给出的是4个波束。每颗卫星投射出4个这样的波束。如图2所示,一颗卫星可使用其一个或更多波束向长途台提供接口。为了在每个长途台与卫星之间建立起一条链路,至少需要有一个波束。一般,一颗卫星仅连接到一个长途台。一个长途台可提供出足够的长途干线段将大量移动用户连接到公共交换电话网20上。
每颗卫星可在其4个波瓣或网孔之间进行内部切换,这与通常的电信系统中的支局内交换是相类似的。
例如,卫星与其移动用户或长途台之间通过波束的上行/下行线路可以在大约2.1至3.9GHZ范围内发射和接收数据。现有技术和可用频带使得这个频带成为优选的数据传输范围。然而,本发明的应用不仅仅局限于在这个频带范围内进行的数据传输。
如上所述,数据(数字声或数据)以数据包形式传送。因此,通过本卫星系统既可实现高速声音数据传输,也可实现高速数据传输。根据给定的现有的可用带宽,数据传输速率至少是1200波特。然而,展宽带宽时,这个系统可达到高得多的数据传输速率。
图4示出一个卫星交换单元100,它通过波束102与移动用户120直接连接。该卫星100通过波束104与数据库计算机110相连,它又通过波束106与数据库计算机130相连。这种与数据库计算机130的连接可如图4所示通过波束106直接进行,或者通过另一颗卫星间接进行。
移动用户可在本地区内漫游或旅行。本地区可以是个城市,例如纽约、洛杉矶等。数据库计算机110内包含有关于其每个移动用户的所有信息。只要特定的移动用户在其本地区内进行通信,有关该用户的所有可用信息在本地区的数据库计算机内均可得到。
例如,如果洛杉矶市的一个本地区用户旅行到纽约城,试图使用其卫星蜂窝状电话进行通信,该用户的新区域即纽约城的数据库计算机是不会知道他的存在的。如果数据库计算机110是在该移动用户的本地区即洛杉矶市,则数据库计算机110内有这个特定移动用户的全部信息。因此,该移动用户在纽约城不允许发出呼叫,因为该地区的本地区数据库计算机不认识他。
为了解决这个问题,由系统周期性地访问每个移动用户的地址,当他挂电话时,其业务呼叫就可被识别并按路由接通。然而由于一个特定用户的数据库通过卫星系统存储在其本地区数据库计算机内,所以,该卫星系统首先访问该地区来确定他不再这里,并获得该用户的交换信息。当作出这种判定后,新地区的数据库计算机便能更新数据,将这个“漫游”的用户包括进来。因此,这个用户便可在其新地区内发出呼叫和接收呼叫。由于该卫星系统访问用户的本地区数据库计算机来确定其地址,所以,通过整个卫星系统可找到该用户。这样,该系统具有寻找漫游的用户并建立起与他们进行通信的能力。
为了便于跟踪每个移动用户,每部移动电话提供出一个控制信号,它周期性地被监测,因而当出现电话用户发出呼叫时,最靠近的卫星就能跟踪他,通过卫星网络访问该用户的本地区数据库计算机,以确定其有关的客户信息。该移动电话能自动地对卫星网络指明新的地址,供数据库计算机更新数据。这种控制信号能使漫游用户进入的呼叫通过卫星到卫星连接至本地区的数据库计算机,因而该呼叫有效地被接受。
卫星蜂窝状通信系统中的每颗卫星是自导航的。也就是,它使用地球定位卫星系统(GPS)或者时间和星历表数据,由此来计算其位置信息。此外,根据地球定位卫星系统或别的飞行器固定位置,每颗卫星能确定它本身的位置,从而相应地变更其航线以保持在应有的轨道内,同时提供出交换服务。
每颗卫星可对本卫星内(特定交换单元或网孔之内)的呼叫进行交换,或者可以通过微波或激光线路(链路i、i+1)将该呼叫切换到其轨道平面内或其轨道平面外(相邻轨道平面)的另一颗卫星上。每颗卫星能识别特定的电话号码,并确定此电话号码是否在其自已的通话区内,或者另一颗卫星的通话区内。如果这个电话号码在另一颗卫星的通话区内,则该呼叫切换到下一个合适的卫星或网孔上,再做同样的判定,直至某颗卫星能对这个电话号码提供服务。那颗卫星便通过下行线路接通寻找的、被呼叫的特定移动用户。由于这样的结构,该卫星网络提供出一种分配结点的交换能力。每颗卫星对一个特定区域而言是一个本地交换单元,但这个区域是在不断变化的。因此,当卫星运转出特定电话用户所在的区域时,呼叫就切换出去。
各种复用技术(即频分地址、进分多路、码分多址等)可用于增强图2中所示的链路上各颗卫星之间的传输能力。
由于这个系统的交换单元围绕地球运转和比较可靠地抗外来干扰,所该系统通过采用众所周知的数据加密和解密技术能提供出可靠地传送声音和数据的能力。由于这些切换单元在离地球几百英里上空可靠地工作,因此该系统也可应用于军事通信。
虽然已说明了本发明当前的优选实施例,并详细地描述了它的构成,但显而易见,本专业的熟练人员可做出它的各种变型而并不离开本发明的精神或没离开本发明提出的权利要求范围。
Claims (20)
1.一种用在多个用户之间通信的卫星蜂窝通信系统,它包括:
多个正在轨道上定位的多个卫星交换装置;
链路装置,用以将上述用户连接到上述多个卫星交换装置中至少一个卫星交换装置上以通过上述卫星交换装置在选定的一些上述用户之间建立通信链路;
所述的卫星蜂窝通信系统,其特征在于:
上述的多个卫星交换装置中的每一个都包括第一装置,用以在上述的卫星交换装置之间转接通信链路;
上述的多个卫星交换装置中的每一个都包括多个网孔装置,用以提供通信链路;及
上述的多个交换装置中的每一个都包括第二装置,用以在同一个卫星交换装置内,将通信链路从第一网孔装置转换到第二个网孔装置上。
2.根据权利要求1所述的卫星蜂窝通信系统,其特征在于,所述的卫星交换装置包括:
位于地球周围低地球轨道上的多个卫星交换单元装置;和
在某一卫星交换单元装置与任一相邻的卫星交换单元装置之间进行多方向通信的第二链路装置。
3.根据权利要求2所述的卫星蜂窝通信系统,其特征在于,所述第二链路装置包括微波通信装置。
4.根据权利要求2所述的卫星蜂窝通信系统,其特征在于,所述第二链路装置包括激光通信装置。
5.根据权利要求2所述的卫星蜂窝通信系统,其特征在于,所述卫星交换单元装置包括:
连接到所述多个用户上的天线装置,用以在上述用户与卫星交换单元装置之间建立通信;
为上述卫星交换单元装置提供电能的太阳能电池装置;和
连接到上述太阳能电池装置以存储上述电能的存储蓄电池装置。
6.根据权利要求1所述的卫星蜂窝通信系统,其特征在于,上述卫星交换装置包括相互连接的多个网孔装置,上述一个网孔装置将用户之间已建立的上述通信链路转接到上述网孔装置中的另一个网孔装置上。
7.根据权利要求1所述的卫星蜂窝通信系统,其特征在于,由蜂窝状电话装置将每个上述用户连接到上述链路装置上。
8.根据权利要求1所述的卫星蜂窝通信系统,其特征在于,还包括:
上述链路装置还将上述卫星交换装置连接到一个公共交换电话网络装置上,上述用户之中的另一些用户被连接到上述公共交换电话网络装置上,上述公共交换电话网络装置装置工作以通过上述链路装置有选择性地将上述公共交换电话网络装置的用户连接到直接与上述卫星交换装置相连的用户上。
9.根据权利要求8所述的卫星蜂窝通信系统,其特征在于,还包括:
连接装置,以将上述链路装置连接到上述公共交换电话网络装置上,该连接装置在上述卫星交换装置与上述公共交换电话网络装置之间提供汇接设备服务。
10.根据权利要求1所述的卫星蜂窝通信系统,其特征在于,所述链路装置包括:
第一链路装置,将上述用户连接到上述卫星交换装置上,通过上述卫星交换装置在选定的上述一些用户之间建立通信链路;和
第二链路装置,允许在某一卫星交换装置与任意一相邻的卫星交换装置之间的进行多方向通信。
11.根据权利要求1所述的卫星蜂窝通信系统,其特征在于,还包括:
数据库装置,连接到上述卫星交换装置上,该数据库装置存储和传送表征上述多个用户的每一个用户的交换信息。
12.根据权利要求1所述的卫星蜂窝通信系统,其特征在于,还包括:
带有控制信号的蜂窝状电话装置,利用上述链路装置将每个上述用户连接到上述卫星交换装置上;
数据库装置,通过上述链路装置连接到上述卫星交换装置上,用以存储和传送表征上述多个用户中的每一个用户的交换信息;及
上述卫星交换装置,工作以响应每个上述用户的蜂窝电话装置的上述控制装置,根据每个用户的当前地址来更新上述数据库装置。
13.根据权利要求1所述的卫星蜂窝通信系统,其特征在于,每个上述卫星交换装置都包括分布式本地处理器装置,用以确定一个呼叫在上述用户之间的交换。
14.根据权利要求1所述的卫星蜂窝通信系统,其特征在于,每个上述卫星交换装置都包括分布节点交换装置。
15.根据权利要求1所述的卫星蜂窝通信系统,其特征在于,
所述卫星交换装置一个卫星,该卫星定位在地球轨道上的并且具有至少两个网孔,每个网孔包括一个通信信道;
所述的链路装置用以将该用户连接到该卫星的第一网孔上;及
与该第一网孔相连接用以在通信期间将通信交换到第二网孔上的装置。
16.根据权利要求15所述的卫星蜂窝通信系统,其特征在于,该系统包括至少两颗卫星,并在这两颗卫星之间产生交换。
17.根据权利要求1的卫星蜂窝通信系统,其特征在于,所述的转接装置还包括:
第一装置,用以在至少两个所述用户之间将通信链路从第一卫星交换装置转接到与第一卫星交换装置相同的轨道面上的第二卫星交换装置;和
第二装置,用以在所述的用户之间将通信链路从所述的第一卫星交换装置转接到在相邻轨道上的第三卫星交换装置。
18.根据权利要求17的卫星蜂窝通信系统,其特征在于,包括:
第三装置,用以将该通信链路从所述第一卫星交换装置转换到与所述卫星交换装置反向运行并在一相邻轨道平面的第四卫星交换装置。
19.根据权利要求1的卫星蜂窝通信系统,其特征在于,包括:
对于所述卫星交换装置的多个用户单元,每个所述的用户单元通过所述卫星交换装置与所述用户单元中的其它单元进行保密通信。
20.根据权利要求1的卫星蜂窝通信系统,其特征在于,包括在多个轨道平面的每个轨道平面上的多颗卫星。
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