US20020132578A1 - Interactive fixed and mobile satellite network - Google Patents

Interactive fixed and mobile satellite network Download PDF

Info

Publication number
US20020132578A1
US20020132578A1 US10/103,070 US10307002A US2002132578A1 US 20020132578 A1 US20020132578 A1 US 20020132578A1 US 10307002 A US10307002 A US 10307002A US 2002132578 A1 US2002132578 A1 US 2002132578A1
Authority
US
United States
Prior art keywords
satellite
transceiver
gateway
communications system
user
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/103,070
Inventor
Robert Wiedeman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Globalstar LP
Original Assignee
Globalstar LP
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US08/772,073 priority Critical patent/US5896558A/en
Priority to US09/090,521 priority patent/US6160994A/en
Priority to US52691900A priority
Application filed by Globalstar LP filed Critical Globalstar LP
Priority to US10/103,070 priority patent/US20020132578A1/en
Publication of US20020132578A1 publication Critical patent/US20020132578A1/en
Application status is Abandoned legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/14Relay systems
    • H04B7/15Active relay systems
    • H04B7/185Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18558Arrangements for managing communications, i.e. for setting up, maintaining or releasing a call between stations
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/14Relay systems
    • H04B7/15Active relay systems
    • H04B7/185Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851Systems using a satellite or space-based relay
    • H04B7/18515Transmission equipment in satellites or space-based relays
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/14Relay systems
    • H04B7/15Active relay systems
    • H04B7/185Space-based or airborne stations; Stations for satellite systems
    • H04B7/195Non-synchronous stations
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/14Relay systems
    • H04B7/15Active relay systems
    • H04B7/204Multiple access
    • H04B7/216Code division or spread-spectrum multiple access

Abstract

A communications system includes at least one low earth orbit first satellite (10), at least one second satellite (11) in other than a low earth orbit, and a ground segment (12) that includes a plurality of user transceivers (78, 80, 82, 84) and at least one gateway (76) coupled to a publicly-accessible terrestrial communications system, such as a PSTN and/or a fiber optic network. The first satellite includes a first transceiver for communication with the at least one gateway, a second transceiver for communication with at least one user transceiver, and a third transceiver for communication with the at least one second satellite. The first, second and third transceivers are switchably coupled together on-board the first satellite by on-board processors and a switching matrix for relaying a user communication between the at least one gateway and the at least one user transceiver via the at least one second satellite. The plurality of user transceivers can include a plurality of data processors which are interconnected into a network through the at least one first satellite. This network can be considered as a virtual network, and can have a mesh, star, or other topology. In a presently preferred, but not limiting embodiment of this invention, the user transceivers are adapted to transmit and receive direct sequence, code division/multiple access communications. Transmission of signals to and from the user transceivers is accomplished by spreading a digital data stream (e.g., voice, data, image, video) with assigned spreading codes.

Description

    FIELD OF THE INVENTION
  • This invention relates generally to communications systems and, in particular, to communications systems that employ one or more satellites to direct user communications through the system. [0001]
  • BACKGROUND OF THE INVENTION
  • Satellite delivered individual services are emerging as a new global enterprise. These systems utilize or are proposed to utilize many individual circuits routed through one satellite or a constellation of many satellites to effect communications. One value of the satellite system is that it provides ubiquitous coverage of large areas of the earth without the construction of ground-based infrastructure. Since the recent availability of portions of the frequency spectrum for these services, several proposals have been advanced by a number of organizations. One proposal would use Time Division Multiple Access (TDMA), while several others would employ Code Division Multiple access (CDMA). A feature of the CDMA systems is an ability to share the available frequencies by co-frequency operation, while experiencing only a percentage decrease in the capacity of each system. [0002]
  • Furthermore, Low Earth Orbiting Satellite (LEOS) systems, also referred to as Non-GSO (geosynchronous orbit) satellite systems, offer a new dimension in communications. For example, the LEOS systems can provide diversity, as described in U.S. Pat. No.: 5,233,626, issued Aug. 3, 1993, entitled “Repeater Diversity Spread Spectrum Communication System”, to Stephen A. Ames. Another capability provided by the LEOS systems is an ability to interconnect users to a fixed point, typically referred to as a Public Switched Telephone Network (PSTN). [0003]
  • High capacity, fiber optic-based communications is currently being deployed world-wide, and in particular in the United States, to directly connect to subscribers in their homes. In addition to providing conventional voice communication capability, the fiber optic-based networks can also provide video and high speed data capabilities. The proliferation of networked personal computers having multimedia capabilities can take advantage of the increased speed and capacity provided by the fiber optic based networks. However, the significant costs involved in providing fiber optic lines is not economical in every locale, and it can be expected that large non-urban areas will not be in a position to benefit from the advantages provided by fiber optic networks within a reasonable period of time. [0004]
  • OBJECTS OF THE INVENTION
  • It is a first object of this invention to provide a system and a method for providing communications services to regions which are not currently economical to serve with fiber optics. [0005]
  • It is a further object of this invention to provide a satellite-based communications system that provides, in addition to mobile and fixed voice and data service, a capability to provide high speed video and data service. [0006]
  • SUMMARY OF THE INVENTION
  • The foregoing and other problems are overcome and the objects of the invention are realized by a communications system that is constructed and operated in accordance with this invention. The communications system includes at least one low earth orbit first satellite, and preferably a constellation of multiple low earth orbit repeater satellites. The satellites of the constellation are preferably in inclined circular orbits operating at an altitude of less than 2000 kilometers. The communications system also includes at least one, and preferably a plurality of second satellites in other than a low earth orbit, such as a geosynchronous orbit. The communications system also includes a ground segment having a plurality of user transceivers and at least one gateway coupled to a publicly-accessible terrestrial communications system and/or to various private networks, such as a PSTN and/or a fiber optic network. The first satellite(s) include a first transceiver for communication with the at least one gateway, a second transceiver for communication with at least one user transceiver, and a third transceiver for communication with the at least one second satellite. The first, second and third transceivers are switchably coupled together on-board the first satellite for relaying user communications, such as voice, data, image, and video, between the at least one gateway and the at least one user transceiver via the at least one second satellite. [0007]
  • The at least one first satellite further includes a first on-board processor that is bidirectionally coupled to the first transceiver; a second on-board processor that is bidirectionally coupled to the second transceiver; and a switching network that is bidirectionally coupled to the first and second on-board processors and to the third transceiver for selectively establishing communication paths between the first and second on-board processors and the third transceiver. [0008]
  • The plurality of user transceivers can include a plurality of data processors which are interconnected into a network through the at least one first satellite. This network can be considered as a virtual network, and can have a mesh, star, or other topology. In a presently preferred, but not limiting embodiment of this invention, the user transceivers are adapted to transmit and receive direct sequence, code division/multiple access (DS-CDMA) communications, wherein the transmission of signals to and from the user transceivers is accomplished by spreading a digital data stream (e.g., voice, data, image, video) with predetermined spreading codes.[0009]
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The above-set forth and other features of the invention are made more apparent in the ensuing Detailed Description of the Invention when read in conjunction with the attached Drawings, wherein: [0010]
  • FIG. 1 is a block diagram of a satellite-based communications system in accordance with this invention; [0011]
  • FIG. 2 is a block diagram of one of the gateways illustrated in FIG. 1; [0012]
  • FIG. 3 illustrates a constellation of LEO satellites having inter-satellite links with a constellation of GSO, MEO, or other, higher orbiting, satellites; [0013]
  • FIG. 4 illustrates various service types and their connectivity through the LEO and GSO satellite constellations; [0014]
  • FIG. 5 schematically illustrates various geographical regions having extensive, medium, and non-existent fiber optic service; and [0015]
  • FIG. 6 schematically illustrates a plurality of data processors that are connected directly and indirectly (through a satellite and gateway) to a fiber optic network.[0016]
  • DETAILED DESCRIPTION OF THE INVENTION
  • Reference is made to FIG. 1 for illustrating an exemplary embodiment of this invention. At least one and preferably a plurality of satellites [0017] 10 are provided in earth orbit. The satellites 10 may form a constellation of low earth orbit satellites (LEOS), such as a constellation of 48 satellites orbiting at less than 2000 kilometers, such as about 1400 kilometers, in several inclined orbital planes. The orbits may be circular, although the teaching of this invention is not limited for use only with circular orbits. Coupled to the satellites 10 via uplink and downlink RF signals and associated transceivers is a terrestrial or ground segment 12. The satellites 10 operate so as to interconnect various elements of the ground segment 12 through different portions of the frequency spectrum via a plurality of RF transmitters and receivers (transceivers), on-board processors, and a switching matrix capable of interconnecting any one of the on-board processors to another. A provision is also made for coupling to other satellites of the same and/or a different constellation though inter-satellite links (ISL), such as RF or optical links.
  • In the presently preferred embodiment of this invention the satellites [0018] 10 include circuitry 14 and antennas 16 and 18 for providing inter-satellite links with other satellites 11, such as a higher-orbiting geosynchronous orbit (GSO), medium earth orbit (MEO), or Molniya constellation of satellites. In this manner a given communication signal can be uplinked from a portion of the ground segment 12 to one of the satellites 10, and can then be routed through one or more other satellites 11 before being downlinked back to the ground segment 12, either directly or through another LEO satellite 10. This link may be bidirectional (e.g., full duplex).
  • The antennas [0019] 16 and 18 may be either non-deployed phased arrays or deployed reflectors with multiple beam feed assemblies located in a reflector focal plane.
  • Describing FIG. 1 now in greater detail, the satellite [0020] 10 includes an S-band receive antenna 20, an S-band transmit antenna 22, an L-band receive antenna 24 and an S-band transmit antenna 26. S-band antennas 20 and 22 may operate at frequencies of 2.2 and 1.9 GHz, respectively, with a bandwidth of 30 MHz. The L-band antenna 24 may operate at 1.6 GHz, while the downlink S-band antenna 26 may operate at 2.5 GHz. The antennas 20 and 22 may be either non-deployed phased arrays, deployed phased arrays, or deployed reflectors with multiple beam feeds located at the focal plane of the reflector. The bandwidth of the L-band and S-band transmissions through antennas 24 and 26 may be 16.5 MHz. Coupled to antennas 20-26 are respective RF circuit blocks 28-34 respectively. The RF circuit blocks 28-34 include suitable signal modulators and demodulators, as appropriate. A presently preferred access technique employs a direct sequence (DS), code division/multiple access (CDMA) technique. This invention is not, however, limited to only a DS-CDMA approach. By example, a suitable time division/multiple access (TDMA) technique can also be used.
  • In the case of DS-CDMA, each RF circuit block includes circuitry for phase demodulating and despreading received communications using user-assigned pseudo-noise (PN) spreading codes to separate a plurality of user signals that occupy a same portion of the bandwidth of the uplinked RF signal. The result is a plurality of digital data streams that are input to an on-board processor (OBP) [0021] 36 for processing and routing. Transmission of signals to the users is accomplished by spreading a digital data stream (e.g., voice, data, image, video) that is received from the OBP 36 with assigned spreading codes, and then phase modulating the spread communications prior to transmission.
  • Bidirectionally coupled to the S-band antenna/RF block pair [0022] 20, 22, 28 and 30 is the first on-board processor (OBP) 36. Coupled to the L-band, S-band antenna/RF block pair 24, 26, 32 and 34 is a second on-board processor 38. As was indicated above, the on-board processors 36 and 38 receive communications signals that have been down-converted to baseband and demodulated (i.e., taken down to bits) within the respective RF blocks 28 and 32. Routing and other information within the communications, for example destination addresses associated with data packets of speech, video, or data, is examined by the OBP for destination and other information, and is thence routed through an interconnector-router (ICR) block 70 to another OBP for completing a required circuit. The ICR block 70 can be comprised of a cross-bar or similar switching arrangement that is programmed by the OBPs so as to establish and maintain non-blocking communication paths between its various input and output (I/O) ports 70 a-70 f. The ICR block 70 is thus able to controllably route communication signals to and from the various ones of the OBPs and also, if provided, other satellites 10 via the inter-satellite links block 14 and its associated antennas 16 and 18, via the satellite(s) 11. This interconnection capability enables a variety of ground segment terminal and equipment types to be coupled together, and to be coupled to an underlying communications infrastructure (e.g., PSTN and/or fiber optic network) through one or more satellites 10 and/or 11.
  • The satellite [0023] 10 further includes a first Ka-band (user-link) transmit antenna 40, a first Ka-band (user-link) receive antenna 42, a second Ka-band (feederlink) transmit antenna 44, and a second Ka-band (feederlink) receive antenna 46. The Ka-band antennas may operate at about 19 GHz (receive) and about 28 GHz (transmit), bandwidth 400 MHz, and provide the high speed, high capacity user links that are a feature of this invention. These antennas may be either non-deployed phased arrays, deployed phased arrays, or deployed reflectors with multiple beam feeds located at the focal plane of the reflector. Coupled to antennas 40-46 are respective RF circuit blocks 48-54 respectively. The RF circuit blocks 48-54 include suitable signal modulators and demodulators, as appropriate. OBPs 56 and 58 are bidirectionally connected to the RF circuit blocks 48, 50 and 52, 54, respectively, and also to the ICR 70.
  • The satellite [0024] 10 also includes, by example, a Ka-band or a C-band (feederlink) transmit antenna 60 and a Ka-band or a C-band receive (feederlink) antenna 62. For a presently preferred C-band embodiment the feederlinks operate in the range of 3 GHz to 7 GHz. Coupled to antennas 60 and 62 are respective RF circuit blocks 64 and 66, respectively. The RF circuit blocks 64 and 66 include suitable signal modulators and demodulators, as appropriate. The OBP 68 is bidirectionally connected to the RF circuit blocks 64 and 66, and also to the ICR 70.
  • Turning now the ground segment [0025] 12, there are provided a plurality of terrestrial data, or data and/or voice networks and also fixed and mobile user terminals. The ground segment 12 includes first gateways 72 having transceivers for communicating with the satellite C-band antennas 60 and 62. These transmissions are feederlinks through which voice and data communications can be directed to and from a terrestrial public switched telephone network 74 (PSTN) and, by example, the user terminals 82 and 84. The various terminals and other equipment designated as 78, 80, 82 and 84 may all be considered to be subscriber or user terminals or transceivers.
  • FIG. 2 shows the gateway [0026] 72 in greater detail, it being realized that typically a plurality of the gateways are provided for serving different geographical areas. Each gateway 72 includes up to four dual polarization RF C-band sub-systems each comprising an antenna 90, antenna driver 92 and pedestal 94, low noise receivers 96, and high power amplifiers 98. All of these components may be located within a radome structure to provide environmental protection.
  • The gateway [0027] 72 further includes down converters 100 and up converters 102 for processing the received and transmitted RF carrier signals, respectively. The down converters 100 and the up converters 102 are connected to a CDMA sub-system 104 which, in turn, is coupled to the Public Switched Telephone Network (PSTN) though a PSTN interface 106. As an option, the PSTN could be bypassed by using satellite-to-satellite links.
  • The CDMA sub-system [0028] 104 includes a signal summer/switch unit 104 a, a Gateway Transceiver Subsystem (GTS) 104 b, a GTS Controller 104 c, a CDMA Interconnect Subsystem (CIS) 104 d, and a Selector Bank Subsystem (SBS) 104 e. The CDMA sub-system 104 is controlled by a Base Station Manager (BSM) 104 f and functions in a manner similar to a CDMA-compatible (for example, an IS-95 compatible) base station. The CDMA sub-system 104 also includes the required frequency synthesizer 104 g and possibly a Global Positioning System (GPS) receiver 104 h.
  • The PSTN interface [0029] 106 includes a PSTN Service Switch Point (SSP) 106 a, a Call Control Processor (CCP) 106 b, a Visitor Location Register (VLR) 106 c, and a protocol interface 106 d to a Home Location Register (HLR). The HLR may be located in a cellular gateway or in the PSTN interface 106.
  • The gateway [0030] 72 is connected to telecommunication networks through a standard interface made through the SSP 106 a. The gateway 72 provides an interface and connects to the PSTN via a Primary Rate Interface (PRI), or other suitable means. The gateway 72 is further capable of providing a direct connection to a Mobile Switching Center (MSC).
  • The gateway [0031] 72 may provide SS-7 ISDN fixed signalling to the CCP 106 b. On the gateway-side of this interface, the CCP 106 b interfaces with the CIS 106 d and hence to the CDMA sub-system 104. The CCP 106 b provides protocol translation functions for the system Air Interface (AI), which may be similar to the IS-95 Interim Standard for CDMA communications.
  • Blocks [0032] 106 c and 106 d generally provide an interface between the gateway 72 and an external cellular telephone network that is compatible, for example, with the IS-41 (North American Standard, AMPS) or the GSM (European Standard, MAP) cellular systems and, in particular, to the specified methods for handling roamers, that is, users who place calls outside of their home system.
  • Overall gateway control is provided by a gateway controller [0033] 108 which includes an interface 108 a to a Ground Data Network (GDN) 110 which interconnects the various gateways one to another and to Ground Operations Control Center (GOCC) 112. An interface 108 b to a Service Provider Control Center (SPCC) 114 can also be provided. The gateway controller 108 is generally interconnected to the gateway 72 through the BSM 104 f and through RF controllers 116 associated with each of the antennas 90. The gateway controller 108 is further coupled to a database 118, such as a database of users, satellite ephemeris data, etc., and to an I/O unit 120 that enables service personnel to gain access to the gateway controller 108.
  • Referring now again to FIG. 1, the ground segment [0034] 12 further includes a fixed terrestrial network having a second gateway 76 that is bidirectionally connected to the Ka-band antennas 44 and 46 of the satellite 10. Gateway 76 is also connected to the PSTN 74 and is also connected to a fiber optic network 75 through a suitable fiber optic interface. The gateway 76 can communicate with a number of different types of equipment such as data processors (e.g., multimedia PCs 78 having a suitable RF interface 78 a connected to a suitable RF front end 78 b and a Ka-band antenna 78 c). Other devices, such as user entertainment equipment 80 (e.g. television) can also be accommodated. The other devices can also be interfaces to a wireless local loop (WLL) of a type that serves an office building, residential area, etc. In these cases the other equipment 80 is also provided with suitable RF circuitry and a Ka-band antenna 80 a. The units 78 and 80 can be considered to form one or more virtual mesh, star or other network types having a capability to be interconnected via the satellites 10, gateway 76, the PSTN 74, and the fiber optic network 75. By example only, a 400 MHz bandwidth, 1 MB/sec data link capability is provided between the units 78, 80 and the second gateway 76, thereby enabling the delivery of, by example, video, image and Internet services.
  • In accordance with an aspect of this invention the system disclosed in FIG. 1 can provide a global, wideband Internet access capability with negligible connectivity time. The invention also enables a direct video download to a TV/PC, enables the use of interactive video, and also enables 2-way videophone capability. Interoperability with mobile communication devices [0035] 82 and 84 (e.g., handheld or fixed user terminals) is also provided (via the first gateway 72 or the second gateway 76), as is interoperability with various terrestrial wireless local loop systems.
  • Reference is now made to FIG. 3 for illustrating a further aspect of the instant invention. The sphere generally indicates the surface of the earth over which traverse a plurality of the LEO satellites [0036] 10. Each satellite 10 has a beam coverage area on the surface of the earth indicated generally as 10 a. The beam coverage areas may overlap, thus providing for diversity reception by user terminals and other equipment located within the overlap region. Also shown are a plurality of the other satellites 11 which are in a higher orbit, such a geosynchronous orbit (GSO) or a medium-earth orbit (MEO). Other orbits, such as a Molniya orbit, can also be used. Each satellite 11 has a corresponding larger coverage region indicated by 11 a.
  • In this aspect of the invention the LEO satellites [0037] 10 are connected to, by example, the GSO satellites 11 via the inter-satellite links (ISL). In this manner transmissions from the region 10 a can be relayed to the larger region 11 a, and vice versa. The regions can be closely spaced apart, or can be located on opposite sides of the earth.
  • Reference in this regard can also be made to FIG. 4 for illustrating various types of interconnectivity between and functionality of the various terrestrial terminals and the LEO constellation, either directly or via the synchronous or other constellation type. By example, the block [0038] 122, designated First Mobile Circuit Switched, communicates using the L-band and S-band satellite antennas 24 and 26 of FIG. 1, and can include mobile voice, cellular extension, GSM compatibility, and world roaming. The block 124, designated Second Mobile Circuit Switched, communicates using the S-band satellite antennas 20 and 22 of FIG. 1, and can include mobile voice, PCS extension, FPLMTS compatibility, and world roaming. The block 126, designated Fixed Circuit Switched, communicates using the Ka-band satellite antennas 40 and 42 of FIG. 1, and can include fixed voice and data, fiber optics extension, medium speed data, private networks, and internet services. The block 128 (also Ka-band), designated International Circuit Switched, communicates via, by example, the GSO constellation and can provide a transport facility, an extended circuit switched network, international long lines, private networks, and international Internet. The block 130, designated International Wideband and Video, can include international video and wideband data distribution, regional video, and wideband data. The block 132, designated Domestic Wideband and Video, can provide domestic video and wideband data distribution. All of these various functions and features can be simultaneously active and interconnected through the constellation of LEO satellites 10 and the GSO (or other constellation type) satellites 11 via the ISL. It should be noted in FIG. 4 that inter-satellite links are also preferably provided between the GSO satellites 11.
  • FIG. 5 illustrates an exemplary case where fiber optic cables are routed between major cities and metropolitan areas. Within the major cities and metropolitan areas an extensive fiber optic infrastructure may exist. Between these areas the fiber optic service is only marginally provided, such as in the smaller city and town regions that are tapped into the fiber optic trunks that interconnect the larger cities and metropolitan areas. Other areas have no local fiber optic service. However, and in accordance with an aspect of this invention, the satellite service area [0039] 10 a covers this region of little or no fiber optic service and provides an equivalent service via the fixed portion of the ground network 12 shown in FIG. 1 (i.e., the gateway 76, Ka links, satellites 10, and terminals 78 and 80).
  • FIG. 6 illustrates the connectivity between various digital TV/computers, the satellite [0040] 10, and local and long distance fiber optic networks. As can be seen, the digital TV/computer designated 140 has a direct connection (DC) to a local fiber-optic line and network which in turn is connected through a telephone or cable company 142 to a regional fiber network. The regional fiber network is connected via a long distance or cable company 144 to a long distance fiber network. The long distance fiber network is connected to a further telephone or cable company 146 (or other entity) which in turn is connected to a distribution node 148. The distribution node 148 includes the gateway 76 and is thereby connected via one or more of the satellites 10 (or one of the GSO or MEO satellites 11) to the antenna 78 c, RF section 78 b and interface 78 a of the PC 78 (refer also to FIG. 1). The connection between the antenna 78 c and the RF section 78 b can be a wired or a wireless connection. In this manner, the PC 78 is enabled to be coupled to the fiber network in essentially the same manner as the digital TV/computer 140 which has a direct connection to the fiber-optic network, and is thus enabled to avail itself of network and other services that are best served by the higher data rates made available by fiber optic lines.
  • The PC [0041] 78 can thus be connected to others of similar type in a mesh network, or in a star network, to the distribution node 148 and thence to the serving entity such as the telephone or cable company. Further connections to the PSTN can also be made. The further connections can be to other computers of similar type, to servers and/or to larger computers providing network (e.g., Internet) services.
  • The antenna [0042] 78 c may be directional, but is preferably omni-directional with hemispherical or semi-hemispherical coverage.
  • The use of the LEO constellation of satellites [0043] 10 provides unique advantages when employed with the teaching of this invention. Consider a mobile terminal which is moving under a tree (or other RF obstacle, such as a building) and is blocked to one of several satellites 10 serving the user (i.e., assume that the mobile terminal is located in the overlap region of the coverage areas shown in FIG. 3). The use of diversity combining from those satellites that are not blocked provides improved service and connectivity to the satellite constellation. It can be shown that this performance increase is significant and provides mitigation of shadowing and blocking due to movement of the user terminal. In this regard the disclosure of U.S. Pat. No.: 5,233,626, issued Aug. 3, 1993, entitled “Repeater Diversity Spread Spectrum Communication System”, to Stephen A. Ames is incorporated by reference herein in its entirety for illustrating suitable embodiments of a receiver employing diversity combining.
  • When considering a LEO fixed system, the rain attenuation can be severe in the frequency bands above 3 GHz, and especially above 10 GHz. Rain fades of 20 db or more occur in the Ka band frequencies. It is widely known that the availability of satellite systems to deliver signals of the desired strength is affected by these rain fades. It is also known by experimentation that the duration and fade depth is affected by the rainfall zone that the user is in (deserts have much improved availability as compared to tropical forest areas). Furthermore, “rain cells”, i.e., local rain zones around the user, have characteristics which cause rapidly changing conditions near user sites. In fact, for fixed locations operating with GSO satellites a significant amount of analysis has been done in predicting the availability of signals due to rain attenuation. Since the rain cells cannot be avoided a certain percentage of the time from coming between the fixed user and a GSO satellite there is not much the fixed user can do to compensate for the rain fade. In the past, it has been known to provide excessive margin to partially overcome theses attenuations, and in some cases to utilize another site located 35 to 50 or more miles away, to provide a “diversity” site. Switching between these two sites can increase the system signal availability. However, for a home or office user it is not practical to provide such a diversity site. [0044]
  • In accordance with an aspect of this invention, by providing more signal paths to the user from two or more of the satellites [0045] 10 at different and changing azimuth and elevation angles, the effect is to provide the “diversity site” at a single location. In effect it is the opposite of the mobile user moving under the blocking obstruction, as the rain cell moves with respect to the user terminal site. One suitable diversity-type of receiver is described in the above-mentioned U.S. Pat. No.: 5,233,626, issued Aug. 3, 1993, entitled “Repeater Diversity Spread Spectrum Communication System, to Stephen A. Ames.
  • Although described above in the context of specific frequency bands, bandwidths, data rates and the like, it should be realized that these are exemplary, and not limiting, embodiments of this invention. By example only, one or more of the Ka-band links shown in FIG. 1 could be replaced by a Ku-band link. Furthermore, the teaching of this invention can be practiced with but one LEO satellite, or with one LEO satellite and one GSO or MEO satellite. However, it is preferred to use larger numbers of satellites to provide a wide area coverage, while also enabling the use of the above-mentioned diversity reception techniques by the subscriber terminals and equipment. [0046]
  • Thus, while the invention has been particularly shown and described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that changes in form and details may be made therein without departing from the scope and spirit of the invention. [0047]

Claims (17)

What is claimed is:
1. A communications system, comprising:
at least one low earth orbit first satellite;
at least one second satellite in other than a low earth orbit; and
a ground segment comprising a plurality of user transceivers and at least one gateway coupled to a terrestrial communications system; wherein
said first satellite comprises a first transceiver for communication with said at least one gateway, a second transceiver for communication with at least one user transceiver, and a third transceiver for communication with said at least one second satellite, said first, second and third transceivers being switchably coupled together on-board said first satellite for relaying a user communication between said at least one gateway and said at least one user transceiver via said at least one second satellite.
2. A communications system as set forth in claim 1, wherein said at least one first satellite further comprises a first on-board processor that is bidirectionally coupled to said first transceiver; a second on-board processor that is bidirectionally coupled to said second transceiver; and a switching network that is bidirectionally coupled to said first and second on-board processors and to said third transceiver for selectively establishing communication paths between said first and second on-board processors and said third transceiver.
3. A communications system as set forth in claim 1, wherein said publicly-accessible terrestrial communications system is comprised of a fiber optic network that is bidirectionally coupled to said at least one gateway.
4. A communications system as set forth in claim 1, wherein said plurality of user transceivers are comprised of a plurality of data processors, and wherein said plurality of data processors are interconnected into a network through said at least one first satellite.
5. A communications system as set forth in claim 1, wherein said plurality of user transceivers are adapted to transmit and receive direct sequence, code division/multiple access communications.
6. A communications system, comprising:
at least one low earth orbit first satellite;
at least one second satellite in other than a low earth orbit; and
a ground segment comprising a plurality of user transceivers and at least one gateway coupled to a terrestrial communications system comprised of fiber optic infrastructure, said at least one gateway comprising a gateway transceiver for bidirectionally coupling said gateway to said at least one first satellite; wherein
a plurality of said user transceivers each comprise a data processor that is bidirectionally coupled to said fiber optic infrastructure through at least one of said first and second satellites and said at least one gateway.
7. A communication system as set forth in claim 6, wherein said at least one first satellite comprises a first transceiver for communication with said at least one gateway, a second transceiver for communication with at least one user transceiver, and a third transceiver for communication with said at least one second satellite, said first, second and third transceivers being switchably coupled together on-board said first satellite for relaying a user communication between said at least one gateway and said at least one user transceiver via said at least one second satellite.
8. A communications system as set forth in claim 6, wherein said at least one gateway transmits digital information to and receives digital information from said at least one satellite, the digital information being comprised of at least one of voice, data, video and image.
9. A communications system as set forth in claim 7, wherein said at least one first satellite further comprises a first on-board processor that is bidirectionally coupled to said first transceiver; a second on-board processor that is bidirectionally coupled to said second transceiver; and a switching network that is bidirectionally coupled to said first and second on-board processors and to said third transceiver for selectively establishing communication paths between said first and second on-board processors and said third transceiver.
10. A communications system as set forth in claim 6, wherein said terrestrial communications system is comprised of a public switched telephone network.
11. A communications system as set forth in claim 8, wherein said at least one gateway transmits and receives the digital information using a direct sequence, code division/multiple access technique.
12. A communications system, comprising:
a first constellation of earth orbiting satellites;
a second constellation of earth orbiting satellites, said second constellation orbiting at a higher altitude than said first constellation;
a plurality of terrestrial mobile user terminals each comprising a transceiver for bidirectionally coupling said mobile user terminal to at least one satellite of said first constellation using a first band of frequencies;
a plurality of terrestrial fixed user terminals each comprising a transceiver for bidirectionally coupling said fixed user terminal to at least one satellite of said first constellation using a second band of frequencies;
at least one first gateway that is bidirectionally coupled to a first terrestrial communication network, said at least one first gateway comprising a transceiver for bidirectionally coupling said first gateway to at least one satellite of said first constellation using a third band of frequencies; and
at least one second gateway that is bidirectionally coupled to a second terrestrial communication network that comprises a fiber optic infrastructure portion, said at least one second gateway comprising a transceiver for bidirectionally coupling said second gateway to at least one satellite of said first constellation using a fourth band of frequencies;
wherein each of said satellites of said first constellation is comprised of a plurality of transceivers operable within said first, second, third, and fourth frequency bands, a further transceiver operable for providing an inter-satellite link with said at least one satellite of said second constellation, a plurality of on-board processors that are bidirectionally coupled to said plurality of transceivers, a switching matrix that is bidirectionally coupled to each of said plurality of on-board processors and to said further transceiver for selectably coupling individual ones of said plurality of on-board processors and said further transceiver together for routing communication signals between said plurality of transceivers and said further transceiver.
13. A communications system as set forth in claim 12, wherein said first band of frequencies includes frequencies in at least one of S-band and L-band, wherein said second band of frequencies includes frequencies in at least one of Ka-band and Ku-band, wherein said third band of frequencies includes frequencies in a C-band or Ka band, and wherein said fourth band of frequencies includes frequencies in at least one of Ka-band and Ku-band.
14. A communications system as set forth in claim 12, wherein said first terrestrial communications system is comprised of a public switched telephone network.
15. A communications system as set forth in claim 12, wherein said transceivers of said at least one first and second gateways transmit and receive RF signals using a direct sequence, code division/multiple access technique.
16. A communications system as set forth in claim 12, wherein said transceivers of said at least one first and second gateways transmit and receive RF signals that are modulated to convey digital information comprised of at least one of voice, data, video and image.
17. A fiber optic communications network, comprising:
a terrestrially-based fiber optic network segment having at least one gateway bidirectionally coupled thereto; and
a space-based fiber optic network segment comprised of a constellation of low earth orbit satellites; at least one other satellite in other than a low earth orbit; inter-satellite links between said constellation of low earth orbit satellites and said at least one other satellite; a first transceiver on-board each of said low earth orbit satellites for bidirectional communication with said terrestrially-based fiber optic network segment via said at least one gateway; and a second transceiver on-board each of said low earth orbit satellites for bidirectional communication with a terrestrial subscriber transceiver, said first and second transceivers being coupled together and to said inter-satellite links on-board each of said low earth orbit satellites.
US10/103,070 1996-12-19 2002-03-21 Interactive fixed and mobile satellite network Abandoned US20020132578A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US08/772,073 US5896558A (en) 1996-12-19 1996-12-19 Interactive fixed and mobile satellite network
US09/090,521 US6160994A (en) 1996-12-19 1998-06-04 Interactive fixed and mobile satellite network
US52691900A true 2000-03-16 2000-03-16
US10/103,070 US20020132578A1 (en) 1996-12-19 2002-03-21 Interactive fixed and mobile satellite network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10/103,070 US20020132578A1 (en) 1996-12-19 2002-03-21 Interactive fixed and mobile satellite network

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US52691900A Continuation 2000-03-16 2000-03-16

Publications (1)

Publication Number Publication Date
US20020132578A1 true US20020132578A1 (en) 2002-09-19

Family

ID=25093826

Family Applications (3)

Application Number Title Priority Date Filing Date
US08/772,073 Expired - Lifetime US5896558A (en) 1996-12-19 1996-12-19 Interactive fixed and mobile satellite network
US09/090,521 Expired - Lifetime US6160994A (en) 1996-12-19 1998-06-04 Interactive fixed and mobile satellite network
US10/103,070 Abandoned US20020132578A1 (en) 1996-12-19 2002-03-21 Interactive fixed and mobile satellite network

Family Applications Before (2)

Application Number Title Priority Date Filing Date
US08/772,073 Expired - Lifetime US5896558A (en) 1996-12-19 1996-12-19 Interactive fixed and mobile satellite network
US09/090,521 Expired - Lifetime US6160994A (en) 1996-12-19 1998-06-04 Interactive fixed and mobile satellite network

Country Status (8)

Country Link
US (3) US5896558A (en)
EP (1) EP0849890A3 (en)
JP (1) JPH10271057A (en)
KR (1) KR19980064390A (en)
AU (1) AU5456298A (en)
CA (1) CA2222388A1 (en)
ID (1) ID19219A (en)
WO (1) WO1998027672A1 (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060284775A1 (en) * 2004-06-10 2006-12-21 Raysat, Inc. Applications for low profile two way satellite antenna system
US20070053314A1 (en) * 2004-08-26 2007-03-08 Yoel Gat Method and apparatus for providing satellite television and other data to mobile antennas
US20080018545A1 (en) * 2004-01-07 2008-01-24 Ilan Kaplan Applications for low profile two-way satellite antenna system
US20080189747A1 (en) * 2004-08-26 2008-08-07 Raysat Antenna Systems, L.L.C. System For Concurrent Mobile Two-Way Data Communications And TV Reception
US20080220771A1 (en) * 2007-03-08 2008-09-11 Viasat, Inc. Satellite reference terminal systems and methods
US20100183050A1 (en) * 2005-02-07 2010-07-22 Raysat Inc Method and Apparatus for Providing Satellite Television and Other Data to Mobile Antennas
US20100218224A1 (en) * 2005-02-07 2010-08-26 Raysat, Inc. System and Method for Low Cost Mobile TV
US20110140884A1 (en) * 2009-10-23 2011-06-16 Globalstar, Inc. Simplex Personal and Asset Tracker
US20110217976A1 (en) * 2004-01-07 2011-09-08 Raysat Antenna Systems, L.L.C. Antenna System
US20110215985A1 (en) * 2004-06-10 2011-09-08 Raysat Antenna Systems, L.L.C. Applications for Low Profile Two Way Satellite Antenna System
WO2012171809A1 (en) * 2011-06-16 2012-12-20 Astrium Sas Satellite communication system, leo satellite relaying communications between a geo satellite and terrestrial stations, the uplinks and downlinks using the same frequency band and time-division multiplexing
US20130101293A1 (en) * 2011-10-03 2013-04-25 William M. Johnson World-wide, wide-band, low-latency, mobile internet and system therefor
US8676121B1 (en) 2011-05-31 2014-03-18 Globalstar, Inc. Method and apparatus for transmitting message from short-range wireless device over a satellite network
US20180019809A1 (en) * 2016-07-13 2018-01-18 Space Systems/Loral, Llc Satellite System That Produces Optical Inter-Satellite Link (ISL) Beam Based On RF Feeder Uplink Beam
US9979465B2 (en) 2016-07-13 2018-05-22 Space Systems/Loral, Llc Satellite system that produces optical inter-satellite link (ISL) beam based on optical feeder uplink beam
US10050699B2 (en) 2016-07-13 2018-08-14 Space Systems/Loral, Llc Satellite system that produces optical inter-satellite link (ISL) beam based on optical ISL received from another satellite
US20190052361A1 (en) * 2017-02-03 2019-02-14 Space Systems/Loral, Llc Ground based subsystems, for inclusion in optical gateway, and that interface with optical networks external to optical gateway

Families Citing this family (174)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5915207A (en) 1996-01-22 1999-06-22 Hughes Electronics Corporation Mobile and wireless information dissemination architecture and protocols
US5896558A (en) * 1996-12-19 1999-04-20 Globalstar L.P. Interactive fixed and mobile satellite network
US6032041A (en) * 1997-06-02 2000-02-29 Hughes Electronics Corporation Method and system for providing wideband communications to mobile users in a satellite-based network
US6708029B2 (en) * 1997-06-02 2004-03-16 Hughes Electronics Corporation Broadband communication system for mobile users in a satellite-based network
US6292659B1 (en) * 1997-06-12 2001-09-18 Motorola, Inc. Global telecommunications system with distributed virtual networks and method of operation therefor
US6560461B1 (en) 1997-08-04 2003-05-06 Mundi Fomukong Authorized location reporting paging system
US6580906B2 (en) * 1997-12-10 2003-06-17 Intel Corporation Authentication and security in wireless communication system
US7171463B1 (en) * 1998-05-20 2007-01-30 Lucent Technologies Inc. System and method for denoting and communicating with computer network mobile sites
US6131811A (en) 1998-05-29 2000-10-17 E-Micro Corporation Wallet consolidator
US6661996B1 (en) * 1998-07-14 2003-12-09 Globalstar L.P. Satellite communication system providing multi-gateway diversity to a mobile user terminal
US6480510B1 (en) * 1998-07-28 2002-11-12 Serconet Ltd. Local area network of serial intelligent cells
US6654344B1 (en) 1999-02-02 2003-11-25 Mentat Inc. Method and system for controlling data flow in an internet over satellite connection
US6460085B1 (en) 1999-02-02 2002-10-01 Mentat Inc. Method and system for managing memory in an internet over satellite connection
IL144658D0 (en) * 1999-02-02 2002-05-23 Mentat Inc Internet over satellite
US6529477B1 (en) 1999-02-02 2003-03-04 Mentat Inc. Internet over satellite system
US6934255B1 (en) 1999-02-02 2005-08-23 Packeteer, Inc. Internet over satellite apparatus
US6584083B1 (en) 1999-02-02 2003-06-24 Mentat Inc. Internet over satellite method
US6337980B1 (en) 1999-03-18 2002-01-08 Hughes Electronics Corporation Multiple satellite mobile communications method and apparatus for hand-held terminals
US6912075B1 (en) 1999-05-17 2005-06-28 The Directv Group, Inc. Ring architecture for an optical satellite communication network with passive optical routing
US7103280B1 (en) 1999-06-05 2006-09-05 The Directv Group, Inc. Architecture for an optical satellite communication network
US6816682B1 (en) * 1999-06-07 2004-11-09 The Directv Group, Inc. Global gateway architecture for interconnecting regional satellites into a communication network
US6192217B1 (en) * 1999-07-01 2001-02-20 Assuresat, Inc. Universal replacement communications satellite
US7174127B2 (en) * 1999-08-10 2007-02-06 Atc Technologies, Llc Data communications systems and methods using different wireless links for inbound and outbound data
US6522865B1 (en) * 1999-08-10 2003-02-18 David D. Otten Hybrid satellite communications system
US6556828B1 (en) * 1999-08-31 2003-04-29 Loral Spacecom Corp. Network architectures for LEO/GEO satellite-based communications systems
US8923766B2 (en) 1999-12-15 2014-12-30 Nokia Corporation Wireless electronic couponing technique
US7308254B1 (en) * 1999-12-15 2007-12-11 Nokia Corporation Wireless electronic couponing technique
US7373085B2 (en) * 1999-12-28 2008-05-13 The Directv Group, Inc. Hybrid satellite and fiber communications system
US6511020B2 (en) * 2000-01-07 2003-01-28 The Boeing Company Method for limiting interference between satellite communications systems
US6741841B1 (en) * 2000-01-28 2004-05-25 Rockwell Collins Dual receiver for a on-board entertainment system
RU2158003C1 (en) * 2000-03-23 2000-10-20 Айнбиндер Иосиф Миронович System for global automatic monitoring of vehicles in normal and extreme conditions
US6633745B1 (en) 2000-03-29 2003-10-14 Societe Europeenne Des Satellites S.A. Satellite cluster comprising a plurality of modular satellites
US7027769B1 (en) 2000-03-31 2006-04-11 The Directv Group, Inc. GEO stationary communications system with minimal delay
JP3456189B2 (en) * 2000-03-31 2003-10-14 日本電気株式会社 Mobile communication system
US6684056B1 (en) * 2000-04-10 2004-01-27 Motorola, Inc. System for providing optimal satellite communication via a MEO/LEO satellite constellation
US6711398B1 (en) * 2000-04-19 2004-03-23 Hughes Electronics Corporation Radio signal broadcast system and method
US20020031103A1 (en) * 2000-05-02 2002-03-14 Globalstar L.P. User terminal employing quality of service path determination and bandwidth saving mode for a satellite ISP system using non-geosynchronous orbit satellites
US7366463B1 (en) * 2000-05-05 2008-04-29 The Directv Group, Inc. Military UHF and commercial Geo-mobile system combination for radio signal relay
US7200360B1 (en) 2000-06-15 2007-04-03 The Directv Group, Inc. Communication system as a secondary platform with frequency reuse
US6711407B1 (en) * 2000-07-13 2004-03-23 Motorola, Inc. Array of processors architecture for a space-based network router
US6829479B1 (en) 2000-07-14 2004-12-07 The Directv Group. Inc. Fixed wireless back haul for mobile communications using stratospheric platforms
AU2001284688B2 (en) 2000-08-02 2006-07-06 Atc Technologies, Llc Coordinated satellite-terrestrial frequency reuse
US7792488B2 (en) 2000-12-04 2010-09-07 Atc Technologies, Llc Systems and methods for transmitting electromagnetic energy over a wireless channel having sufficiently weak measured signal strength
US8265637B2 (en) 2000-08-02 2012-09-11 Atc Technologies, Llc Systems and methods for modifying antenna radiation patterns of peripheral base stations of a terrestrial network to allow reduced interference
US6859652B2 (en) 2000-08-02 2005-02-22 Mobile Satellite Ventures, Lp Integrated or autonomous system and method of satellite-terrestrial frequency reuse using signal attenuation and/or blockage, dynamic assignment of frequencies and/or hysteresis
US7450901B2 (en) * 2000-08-16 2008-11-11 The Boeing Company Methods and apparatus for path discovery between a mobile platform and a ground segment
US6895217B1 (en) 2000-08-21 2005-05-17 The Directv Group, Inc. Stratospheric-based communication system for mobile users having adaptive interference rejection
US6567645B1 (en) 2000-08-28 2003-05-20 Globalstar L.P. Multiple satellite repeater management system using frame error rate for diversity selection
US6594469B1 (en) 2000-08-29 2003-07-15 Globalstar L.P. Methods and apparatus for broadcasting regional information over a satellite communication system
US7317916B1 (en) 2000-09-14 2008-01-08 The Directv Group, Inc. Stratospheric-based communication system for mobile users using additional phased array elements for interference rejection
US7180873B1 (en) 2000-10-06 2007-02-20 Globalstar, Inc. Spread spectrum code division destination access (SS-CDDA) for satellite communication system with distributed gateways
US20040014430A1 (en) * 2001-07-11 2004-01-22 Raviv Melamed Multiple antenna system for wireless communication
US7809403B2 (en) 2001-01-19 2010-10-05 The Directv Group, Inc. Stratospheric platforms communication system using adaptive antennas
US8396513B2 (en) 2001-01-19 2013-03-12 The Directv Group, Inc. Communication system for mobile users using adaptive antenna
US7187949B2 (en) 2001-01-19 2007-03-06 The Directv Group, Inc. Multiple basestation communication system having adaptive antennas
US6745006B2 (en) * 2001-01-29 2004-06-01 Motorola, Inc. Communication system utilizing a constellation of satellites and method therefor
US20020159399A1 (en) * 2001-04-27 2002-10-31 Stephenson Gary V. Combined fixed satellite service and mobile platform satellite service communication system
FR2825207B1 (en) * 2001-05-22 2003-08-29 Cit Alcatel Mf-tdma type telecommunication system and terminal for such a system
US7447501B2 (en) 2001-09-14 2008-11-04 Atc Technologies, Llc Systems and methods for monitoring selected terrestrially used satellite frequency signals to reduce potential interference
US7113778B2 (en) 2001-09-14 2006-09-26 Atc Technologies, Llc Aggregate radiated power control for multi-band/multi-mode satellite radiotelephone communications systems and methods
US7623859B2 (en) 2001-09-14 2009-11-24 Atc Technologies, Llc Additional aggregate radiated power control for multi-band/multi-mode satellite radiotelephone communications systems and methods
US7603081B2 (en) 2001-09-14 2009-10-13 Atc Technologies, Llc Radiotelephones and operating methods that use a single radio frequency chain and a single baseband processor for space-based and terrestrial communications
US7593691B2 (en) 2002-02-12 2009-09-22 Atc Technologies, Llc Systems and methods for controlling a level of interference to a wireless receiver responsive to a power level associated with a wireless transmitter
US7181161B2 (en) 2001-09-14 2007-02-20 Atc Technologies, Llc Multi-band/multi-mode satellite radiotelephone communications systems and methods
US7593724B2 (en) 2001-09-14 2009-09-22 Atc Technologies, Llc Systems and methods for terrestrial reuse of cellular satellite frequency spectrum in a time-division duplex mode
US7664460B2 (en) 2001-09-14 2010-02-16 Atc Technologies, Llc Systems and methods for terrestrial reuse of cellular satellite frequency spectrum in a time-division duplex and/or frequency-division duplex mode
US7062267B2 (en) 2001-09-14 2006-06-13 Atc Technologies, Llc Methods and systems for modifying satellite antenna cell patterns in response to terrestrial reuse of satellite frequencies
US8270898B2 (en) 2001-09-14 2012-09-18 Atc Technologies, Llc Satellite-band spectrum utilization for reduced or minimum interference
US7603117B2 (en) 2001-09-14 2009-10-13 Atc Technologies, Llc Systems and methods for terrestrial use of cellular satellite frequency spectrum
USRE45107E1 (en) 2002-07-02 2014-09-02 Atc Technologies, Llc Filters for combined radiotelephone/GPS terminals
US7155340B2 (en) 2001-09-14 2006-12-26 Atc Technologies, Llc Network-assisted global positioning systems, methods and terminals including doppler shift and code phase estimates
USRE43137E1 (en) 2001-09-14 2012-01-24 Atc Technologies, Llc Filters for combined radiotelephone/GPS terminals
US7890098B2 (en) 2001-09-14 2011-02-15 Atc Technologies, Llc Staggered sectorization for terrestrial reuse of satellite frequencies
US6999720B2 (en) 2001-09-14 2006-02-14 Atc Technologies, Llc Spatial guardbands for terrestrial reuse of satellite frequencies
US7421342B2 (en) 2003-01-09 2008-09-02 Atc Technologies, Llc Network-assisted global positioning systems, methods and terminals including doppler shift and code phase estimates
US7006789B2 (en) 2001-09-14 2006-02-28 Atc Technologies, Llc Space-based network architectures for satellite radiotelephone systems
US7792069B2 (en) 2001-09-14 2010-09-07 Atc Technologies, Llc Systems and methods for terrestrial reuse of cellular satellite frequency spectrum using different channel separation technologies in forward and reverse links
US7218931B2 (en) 2001-09-14 2007-05-15 Atc Technologies, Llc Satellite radiotelephone systems providing staggered sectorization for terrestrial reuse of satellite frequencies and related methods and radiotelephone systems
US7054902B2 (en) * 2001-10-23 2006-05-30 Packeteer, Inc. Multicast delivery systems and methods
AUPR910301A0 (en) * 2001-11-26 2001-12-20 Marine-Watch Limited Satellite system for vessel identification
US6856787B2 (en) 2002-02-12 2005-02-15 Mobile Satellite Ventures, Lp Wireless communications systems and methods using satellite-linked remote terminal interface subsystems
US7024158B2 (en) * 2002-04-25 2006-04-04 Northrop Grumman Corporation Broadband communication satellite
US6937857B2 (en) 2002-05-28 2005-08-30 Mobile Satellite Ventures, Lp Systems and methods for reducing satellite feeder link bandwidth/carriers in cellular satellite systems
US7343398B1 (en) 2002-09-04 2008-03-11 Packeteer, Inc. Methods, apparatuses and systems for transparently intermediating network traffic over connection-based authentication protocols
US7900229B2 (en) 2002-10-15 2011-03-01 Opentv, Inc. Convergence of interactive television and wireless technologies
US7415130B1 (en) * 2002-10-30 2008-08-19 Lockheed Martin Corporation Mail image profiling and handwriting matching
US7672639B2 (en) * 2003-01-29 2010-03-02 Globalstar, Inc. Method and system for routing telemetry in a simplex mode
US7444170B2 (en) 2003-03-24 2008-10-28 Atc Technologies, Llc Co-channel wireless communication methods and systems using nonsymmetrical alphabets
US7203490B2 (en) 2003-03-24 2007-04-10 Atc Technologies, Llc Satellite assisted push-to-send radioterminal systems and methods
US8655398B2 (en) 2004-03-08 2014-02-18 Atc Technologies, Llc Communications systems and methods including emission detection
US6879829B2 (en) 2003-05-16 2005-04-12 Mobile Satellite Ventures, Lp Systems and methods for handover between space based and terrestrial radioterminal communications, and for monitoring terrestrially reused satellite frequencies at a radioterminal to reduce potential interference
US7132953B2 (en) * 2003-06-26 2006-11-07 Lear Corporation Spring sensor assembly for a vehicle seat cushion
KR100958926B1 (en) * 2003-07-23 2010-05-19 주식회사 케이티 wireless internet access repeater and method thereof
US7558568B2 (en) 2003-07-28 2009-07-07 Atc Technologies, Llc Systems and methods for modifying antenna radiation patterns of peripheral base stations of a terrestrial network to allow reduced interference
US8670705B2 (en) 2003-07-30 2014-03-11 Atc Technologies, Llc Additional intra-and/or inter-system interference reducing systems and methods for satellite communications systems
US7340213B2 (en) 2003-07-30 2008-03-04 Atc Technologies, Llc Intra- and/or inter-system interference reducing systems and methods for satellite communications systems
US7113743B2 (en) 2003-09-11 2006-09-26 Atc Technologies, Llc Systems and methods for inter-system sharing of satellite communications frequencies within a common footprint
WO2005032170A2 (en) 2003-09-23 2005-04-07 Atc Technologies, Llc Systems and methods for mobility management in overlaid satellite and terrestrial communications systems
US20050080620A1 (en) * 2003-10-09 2005-04-14 General Electric Company Digitization of work processes using wearable wireless devices capable of vocal command recognition in noisy environments
US8380186B2 (en) 2004-01-22 2013-02-19 Atc Technologies, Llc Satellite with different size service link antennas and radioterminal communication methods using same
IL160417A (en) * 2004-02-16 2011-04-28 Mosaid Technologies Inc Outlet add-on module
US7453920B2 (en) 2004-03-09 2008-11-18 Atc Technologies, Llc Code synchronization in CDMA satellite wireless communications system using uplink channel detection
US7933552B2 (en) 2004-03-22 2011-04-26 Atc Technologies, Llc Multi-band satellite and/or ancillary terrestrial component radioterminal communications systems and methods with combining operation
US7606590B2 (en) 2004-04-07 2009-10-20 Atc Technologies, Llc Satellite/hands-free interlock systems and/or companion devices for radioterminals and related methods
US7636566B2 (en) 2004-04-12 2009-12-22 Atc Technologies, Llc Systems and method with different utilization of satellite frequency bands by a space-based network and an ancillary terrestrial network
US7418236B2 (en) 2004-04-20 2008-08-26 Mobile Satellite Ventures, Lp Extraterrestrial communications systems and methods including ancillary extraterrestrial components
US8265549B2 (en) 2004-05-18 2012-09-11 Atc Technologies, Llc Satellite communications systems and methods using radiotelephone
WO2006012348A2 (en) 2004-06-25 2006-02-02 Atc Technologies, Llc Method and system for frequency translation on-board a communications satellite
US7957694B2 (en) 2004-08-11 2011-06-07 Atc Technologies, Llc Satellite-band spectrum utilization for reduced or minimum interference
US7639981B2 (en) 2004-11-02 2009-12-29 Atc Technologies, Llc Apparatus and methods for power control in satellite communications systems with satellite-linked terrestrial stations
EP1813036B1 (en) 2004-11-16 2012-05-02 ATC Technologies, LLC Satellite communications systems, components and methods for operating shared satellite gateways
US7747229B2 (en) 2004-11-19 2010-06-29 Atc Technologies, Llc Electronic antenna beam steering using ancillary receivers and related methods
US7454175B2 (en) 2004-12-07 2008-11-18 Atc Technologies, Llc Broadband wireless communications systems and methods using multiple non-contiguous frequency bands/segments
US8594704B2 (en) 2004-12-16 2013-11-26 Atc Technologies, Llc Location-based broadcast messaging for radioterminal users
CN101980456A (en) 2005-01-05 2011-02-23 Atc科技有限责任公司 Adaptive beam forming with multi-user detection and interference reduction in satellite communiation systems and methods
KR100673406B1 (en) * 2005-01-26 2007-01-24 아태위성산업 주식회사 Apparatus and method for satellite communication installed in terrestrial potable phone and similar ground terminal
US7596111B2 (en) 2005-01-27 2009-09-29 Atc Technologies, Llc Satellite/terrestrial wireless communications systems and methods using disparate channel separation codes
US7636546B2 (en) 2005-02-22 2009-12-22 Atc Technologies, Llc Satellite communications systems and methods using diverse polarizations
US7738837B2 (en) 2005-02-22 2010-06-15 Atc Technologies, Llc Satellites using inter-satellite links to create indirect feeder link paths
EP1851877A2 (en) 2005-02-22 2007-11-07 ATC Technologies, LLC Reusing frequencies of a fixed and/or mobile communications system
US7756490B2 (en) 2005-03-08 2010-07-13 Atc Technologies, Llc Methods, radioterminals, and ancillary terrestrial components for communicating using spectrum allocated to another satellite operator
US7587171B2 (en) * 2005-03-09 2009-09-08 Atc Technologies, Llc Reducing interference in a wireless communications signal in the frequency domain
US7796986B2 (en) 2005-03-11 2010-09-14 Atc Technologies, Llc Modification of transmission values to compensate for interference in a satellite down-link communications
US7627285B2 (en) 2005-03-14 2009-12-01 Atc Technologies, Llc Satellite communications systems and methods with distributed and/or centralized architecture including ground-based beam forming
WO2006099443A1 (en) 2005-03-15 2006-09-21 Atc Technologies, Llc Intra-system and/or inter-system reuse of feeder link frequencies including interference suppression systems and methods
WO2006099501A1 (en) 2005-03-15 2006-09-21 Atc Technologies, Llc Methods and systems providing adaptive feeder links for ground based beam forming and related systems and satellites
US7453396B2 (en) 2005-04-04 2008-11-18 Atc Technologies, Llc Radioterminals and associated operating methods that alternate transmission of wireless communications and processing of global positioning system signals
US7817967B2 (en) 2005-06-21 2010-10-19 Atc Technologies, Llc Communications systems including adaptive antenna systems and methods for inter-system and intra-system interference reduction
US7970345B2 (en) * 2005-06-22 2011-06-28 Atc Technologies, Llc Systems and methods of waveform and/or information splitting for wireless transmission of information to one or more radioterminals over a plurality of transmission paths and/or system elements
US7907944B2 (en) 2005-07-05 2011-03-15 Atc Technologies, Llc Methods, apparatus and computer program products for joint decoding of access probes in a CDMA communications system
US8190114B2 (en) 2005-07-20 2012-05-29 Atc Technologies, Llc Frequency-dependent filtering for wireless communications transmitters
US7623867B2 (en) 2005-07-29 2009-11-24 Atc Technologies, Llc Satellite communications apparatus and methods using asymmetrical forward and return link frequency reuse
AT466417T (en) * 2005-08-09 2010-05-15 Atc Tech Llc Satellite communication systems and methods using essentially adjustable radio connectivity antennas
WO2007047370A2 (en) 2005-10-12 2007-04-26 Atc Technologies, Llc Systems, methods and computer program products for mobility management in hybrid satellite/terrestrial wireless communications systems
US20080045146A1 (en) * 2006-01-18 2008-02-21 Per Wahlberg Systems and methods for establishing modular and flexible satellite communications networks
US8713324B2 (en) 2006-01-18 2014-04-29 Overhorizon (Cyprus) Plc Systems and methods for tracking mobile terrestrial terminals for satellite communications
US8326217B2 (en) * 2006-01-18 2012-12-04 Overhorizon (Cyprus) Plc Systems and methods for satellite communications with mobile terrestrial terminals
US8078141B2 (en) * 2006-01-18 2011-12-13 Overhorizon (Cyprus) Plc Systems and methods for collecting and processing satellite communications network usage information
US7962134B2 (en) * 2006-01-18 2011-06-14 M.N.C. Microsat Networks (Cyprus) Limited Systems and methods for communicating with satellites via non-compliant antennas
US8090041B2 (en) 2006-01-20 2012-01-03 Atc Technologies Llc Systems and methods for forward link closed loop beamforming
US8705436B2 (en) 2006-02-15 2014-04-22 Atc Technologies, Llc Adaptive spotbeam broadcasting, systems, methods and devices for high bandwidth content distribution over satellite
US7751823B2 (en) 2006-04-13 2010-07-06 Atc Technologies, Llc Systems and methods for controlling a level of interference to a wireless receiver responsive to an activity factor associated with a wireless transmitter
US8923850B2 (en) 2006-04-13 2014-12-30 Atc Technologies, Llc Systems and methods for controlling base station sectors to reduce potential interference with low elevation satellites
US9014619B2 (en) 2006-05-30 2015-04-21 Atc Technologies, Llc Methods and systems for satellite communications employing ground-based beam forming with spatially distributed hybrid matrix amplifiers
US8169955B2 (en) 2006-06-19 2012-05-01 Atc Technologies, Llc Systems and methods for orthogonal frequency division multiple access (OFDMA) communications over satellite links
US8526941B2 (en) 2006-06-29 2013-09-03 Atc Technologies, Llc Apparatus and methods for mobility management in hybrid terrestrial-satellite mobile communications systems
FR2906423B1 (en) * 2006-09-27 2008-12-26 Astrium Sas Soc Par Actions Si Method and system for transmitting data between a satellite and a base station, and sailing stack with relay terminal and base station for implementing the method
PT2087623E (en) 2006-11-03 2010-10-21 Rf Magic Inc Satellite signal frequency translation and stacking
US7840180B2 (en) * 2006-12-22 2010-11-23 The Boeing Company Molniya orbit satellite systems, apparatus, and methods
US8016240B2 (en) * 2007-03-29 2011-09-13 The Boeing Company Satellites and satellite fleet implementation methods and apparatus
US8031646B2 (en) 2007-05-15 2011-10-04 Atc Technologies, Llc Systems, methods and devices for reusing spectrum of another operator
US8064824B2 (en) 2007-07-03 2011-11-22 Atc Technologies, Llc Systems and methods for reducing power robbing impact of interference to a satellite
US8050628B2 (en) * 2007-07-17 2011-11-01 M.N.C. Microsat Networks (Cyprus) Limited Systems and methods for mitigating radio relay link interference in mobile satellite communications
US8948080B2 (en) 2007-07-17 2015-02-03 Overhorizon (Cyprus) Plc Methods comprising satellites having a regenerative payload, onboard computer, payload interface and interference elimination system
US7978135B2 (en) 2008-02-15 2011-07-12 Atc Technologies, Llc Antenna beam forming systems/methods using unconstrained phase response
US8433241B2 (en) 2008-08-06 2013-04-30 Atc Technologies, Llc Systems, methods and devices for overlaid operations of satellite and terrestrial wireless communications systems
EP2340624B1 (en) * 2008-10-28 2018-08-22 Intelsat Global Service LLC Space based local area network (sblan)
US8193975B2 (en) 2008-11-12 2012-06-05 Atc Technologies Iterative antenna beam forming systems/methods
US7945206B2 (en) * 2009-02-04 2011-05-17 Telefonaktiebolaget L M Ericsson (Publ) Data packet transmission scheduling in a mobile communication system
US8339308B2 (en) 2009-03-16 2012-12-25 Atc Technologies Llc Antenna beam forming systems, methods and devices using phase adjusted least squares beam forming
US8520561B2 (en) 2009-06-09 2013-08-27 Atc Technologies, Llc Systems, methods and network components that provide different satellite spot beam return carrier groupings and reuse patterns
US8576769B2 (en) 2009-09-28 2013-11-05 Atc Technologies, Llc Systems and methods for adaptive interference cancellation beamforming
US10110288B2 (en) 2009-11-04 2018-10-23 Atc Technologies, Llc Frequency division duplex (FDD) return link transmit diversity systems, methods and devices using forward link side information
FR2954635B1 (en) * 2009-12-17 2016-03-11 Astrium Sas Hybrid spatial system based on a constellation of satellites in low orbit acting as space repeaters to improve the emission and reception of geostationary signals
US8274925B2 (en) 2010-01-05 2012-09-25 Atc Technologies, Llc Retaining traffic channel assignments for satellite terminals to provide lower latency communication services
JP6091595B2 (en) 2012-03-19 2017-03-08 ロバート ケイ. バックル, Apparatus, method and system for integrating mobile and satellite telephone services
US8913894B2 (en) 2012-07-13 2014-12-16 Raytheon Company High-bandwidth optical communications relay architecture
US8953946B2 (en) 2012-07-13 2015-02-10 Raytheon Company High-bandwidth optical communications relay payload
RU2677634C2 (en) 2014-03-07 2019-01-18 Глобалстар, Инк. Cell tower functionality with satellite access to allow cellular device to roam on satellite network or perform call forwarding in satellite communication network
FR3027173B1 (en) * 2014-10-14 2017-11-03 Thales Sa Architecture of a telecommunication network
JP6386674B2 (en) * 2015-02-03 2018-09-05 クラウド コンステレーション コーポレイション Space-based electronic data storage and transfer network system
US9800915B2 (en) 2016-02-10 2017-10-24 At&T Intellectual Property I, L.P. Method and apparatus for satellite television service with alternate delivery capabilities
US10361773B2 (en) * 2017-04-24 2019-07-23 Blue Digs LLC Satellite constellation having multiple orbital inclinations
FR3069990A1 (en) * 2017-08-03 2019-02-08 Thales Flexible useful load architecture for vhts and hts applications

Family Cites Families (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US32905A (en) * 1861-07-23 Daniel B Waite Watch and socket rim
USRE32905F1 (en) * 1980-10-20 1992-11-10 Satellite communications system and apparatus
US4901307A (en) * 1986-10-17 1990-02-13 Qualcomm, Inc. Spread spectrum multiple access communication system using satellite or terrestrial repeaters
GB8801008D0 (en) * 1988-01-18 1988-02-17 British Aerospace Acquisition system for multiple access optical communication system
IL91529D0 (en) * 1988-10-28 1990-04-29 Motorola Inc Satellite cellular telephone and data communication system
AU5813090A (en) * 1989-04-25 1990-11-16 Geostar Corporation Communication system employing multiple relay satellites operating on common downlink frequency
US5161248A (en) * 1989-10-02 1992-11-03 Motorola, Inc. Method of predicting cell-to-cell hand-offs for a satellite cellular communications system
US5265119A (en) * 1989-11-07 1993-11-23 Qualcomm Incorporated Method and apparatus for controlling transmission power in a CDMA cellular mobile telephone system
US5109390A (en) * 1989-11-07 1992-04-28 Qualcomm Incorporated Diversity receiver in a cdma cellular telephone system
US5010317A (en) * 1989-11-30 1991-04-23 Motorola, Inc. Satellite based simulcast paging system
EP0505489B1 (en) * 1989-12-14 1997-11-05 Motorola, Inc. Satellite based acknowledge-back paging system
US5073900A (en) * 1990-03-19 1991-12-17 Mallinckrodt Albert J Integrated cellular communications system
US5446756A (en) * 1990-03-19 1995-08-29 Celsat America, Inc. Integrated cellular communications system
US5081703A (en) * 1990-06-27 1992-01-14 Pactel Corporation Satellite mobile communication system for rural service areas
US5216427A (en) * 1990-11-01 1993-06-01 California Institute Of Technology Land-mobile satellite communication system
US5239671A (en) * 1990-11-13 1993-08-24 Pagemart, Inc. Simulcast satellite paging system with provision for signal interruption
US5303286A (en) * 1991-03-29 1994-04-12 Space Systems/Loral, Inc. Wireless telephone/satellite roaming system
US5439190A (en) * 1991-04-22 1995-08-08 Trw Inc. Medium-earth-altitude satellite-based cellular telecommunications
US5433726A (en) * 1991-04-22 1995-07-18 Trw Inc. Medium-earth-altitude satellite-based cellular telecommunications system
US5526404A (en) * 1991-10-10 1996-06-11 Space Systems/Loral, Inc. Worldwide satellite telephone system and a network coordinating gateway for allocating satellite and terrestrial gateway resources
EP0935349A3 (en) * 1991-10-28 1999-09-08 Teledesic LLC Satellite communication system
US5233626A (en) * 1992-05-11 1993-08-03 Space Systems/Loral Inc. Repeater diversity spread spectrum communication system
US5363368A (en) * 1992-05-26 1994-11-08 Motorola, Inc. Simultaneous TDMA communication system
US5422647A (en) * 1993-05-07 1995-06-06 Space Systems/Loral, Inc. Mobile communication satellite payload
US5617100A (en) * 1994-04-07 1997-04-01 Matsushita Electric Industrial Co., Ltd. Accurate position measuring system
US5579536A (en) * 1994-06-13 1996-11-26 Motorola, Inc. Method and apparatus for establishing communication links between non-stationary communication units
US5602838A (en) * 1994-12-21 1997-02-11 Lucent Technologies Inc. Global multi-satellite network
JPH08213945A (en) * 1995-02-06 1996-08-20 Atr Kodenpa Tsushin Kenkyusho:Kk Satellite communication system
US5640386A (en) * 1995-06-06 1997-06-17 Globalstar L.P. Two-system protocol conversion transceiver repeater
US5619525A (en) * 1995-06-06 1997-04-08 Globalstar L.P. Closed loop power control for low earth orbit satellite communications system
US5664006A (en) * 1995-06-07 1997-09-02 Globalstar L.P. Method for accounting for user terminal connection to a satellite communications system
US5802445A (en) * 1995-07-13 1998-09-01 Globalstar L.P. Methods and apparatus for providing user RF exposure monitoring and control in a satellite communications system
US5581390A (en) * 1995-08-01 1996-12-03 Motorola, Inc. Apparatus and method for conveying frame timing, data timing, and data
US5758293A (en) * 1996-03-06 1998-05-26 Motorola Inc. Subscriber unit and delivery system for wireless information retrieval
US5890679A (en) * 1996-09-26 1999-04-06 Loral Aerospace Corp. Medium earth orbit communication satellite system
US5896558A (en) * 1996-12-19 1999-04-20 Globalstar L.P. Interactive fixed and mobile satellite network

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7911400B2 (en) 2004-01-07 2011-03-22 Raysat Antenna Systems, L.L.C. Applications for low profile two-way satellite antenna system
US20080018545A1 (en) * 2004-01-07 2008-01-24 Ilan Kaplan Applications for low profile two-way satellite antenna system
US20110217976A1 (en) * 2004-01-07 2011-09-08 Raysat Antenna Systems, L.L.C. Antenna System
US8761663B2 (en) 2004-01-07 2014-06-24 Gilat Satellite Networks, Ltd Antenna system
US20060284775A1 (en) * 2004-06-10 2006-12-21 Raysat, Inc. Applications for low profile two way satellite antenna system
US20110215985A1 (en) * 2004-06-10 2011-09-08 Raysat Antenna Systems, L.L.C. Applications for Low Profile Two Way Satellite Antenna System
US20080189747A1 (en) * 2004-08-26 2008-08-07 Raysat Antenna Systems, L.L.C. System For Concurrent Mobile Two-Way Data Communications And TV Reception
US20070053314A1 (en) * 2004-08-26 2007-03-08 Yoel Gat Method and apparatus for providing satellite television and other data to mobile antennas
US20100218224A1 (en) * 2005-02-07 2010-08-26 Raysat, Inc. System and Method for Low Cost Mobile TV
US20100183050A1 (en) * 2005-02-07 2010-07-22 Raysat Inc Method and Apparatus for Providing Satellite Television and Other Data to Mobile Antennas
US20080219266A1 (en) * 2007-03-08 2008-09-11 Viasat, Inc. Routing paths onboard satellite with reference terminal functionality
US20080219206A1 (en) * 2007-03-08 2008-09-11 Viasat, Inc. Distribution of routing tables for satellite with reference terminal functionality
US20080220771A1 (en) * 2007-03-08 2008-09-11 Viasat, Inc. Satellite reference terminal systems and methods
US8159992B2 (en) * 2007-03-08 2012-04-17 Viasat, Inc. Routing paths onboard satellite with reference terminal functionality
US8159964B2 (en) 2007-03-08 2012-04-17 Viasat, Inc. Distribution of routing tables for satellite with reference terminal functionality
US20110140884A1 (en) * 2009-10-23 2011-06-16 Globalstar, Inc. Simplex Personal and Asset Tracker
US8604925B2 (en) 2009-10-23 2013-12-10 Globalstar, Inc. Simplex personal and asset tracker
US8676121B1 (en) 2011-05-31 2014-03-18 Globalstar, Inc. Method and apparatus for transmitting message from short-range wireless device over a satellite network
US9847829B2 (en) * 2011-06-16 2017-12-19 Airbus Defence And Space Sas Satellite communication system, LEO satellite relaying communications between a GEO satellite and terrestrial stations, the uplinks and downlinks using the same frequency band and time-division multiplexing
FR2976750A1 (en) * 2011-06-16 2012-12-21 Astrium Sas Useful satellite repeater charge, system and method for satellite telecommunications.
US20140105100A1 (en) * 2011-06-16 2014-04-17 Astrium Sas Satellite communication system, leo satellite relaying communications between a geo satellite and terrestrial stations, the uplinks and downlinks using the same frequency band and time-division multiplexing
WO2012171809A1 (en) * 2011-06-16 2012-12-20 Astrium Sas Satellite communication system, leo satellite relaying communications between a geo satellite and terrestrial stations, the uplinks and downlinks using the same frequency band and time-division multiplexing
US9065564B2 (en) * 2011-10-03 2015-06-23 Kara Whitney Johnson World-wide, wide-band, low-latency, mobile internet and system therefor
US20150326304A1 (en) * 2011-10-03 2015-11-12 William M. Johnson World-wide, wide-band, low-latency, mobile internet and system therefor
US20130101293A1 (en) * 2011-10-03 2013-04-25 William M. Johnson World-wide, wide-band, low-latency, mobile internet and system therefor
US20180019809A1 (en) * 2016-07-13 2018-01-18 Space Systems/Loral, Llc Satellite System That Produces Optical Inter-Satellite Link (ISL) Beam Based On RF Feeder Uplink Beam
US9923625B2 (en) * 2016-07-13 2018-03-20 Space Systems/Loral, Llc Satellite system that produces optical inter-satellite link (ISL) beam based on RF feeder uplink beam
US9979465B2 (en) 2016-07-13 2018-05-22 Space Systems/Loral, Llc Satellite system that produces optical inter-satellite link (ISL) beam based on optical feeder uplink beam
US10050699B2 (en) 2016-07-13 2018-08-14 Space Systems/Loral, Llc Satellite system that produces optical inter-satellite link (ISL) beam based on optical ISL received from another satellite
US20190052361A1 (en) * 2017-02-03 2019-02-14 Space Systems/Loral, Llc Ground based subsystems, for inclusion in optical gateway, and that interface with optical networks external to optical gateway
US10476595B2 (en) * 2017-02-03 2019-11-12 Space Systems/Loral, Llc Ground based subsystems, for inclusion in optical gateway, and that interface with optical networks external to optical gateway

Also Published As

Publication number Publication date
EP0849890A3 (en) 2001-02-07
JPH10271057A (en) 1998-10-09
CA2222388A1 (en) 1998-06-19
EP0849890A2 (en) 1998-06-24
US6160994A (en) 2000-12-12
ID19219A (en) 1998-06-28
KR19980064390A (en) 1998-10-07
AU5456298A (en) 1998-07-15
US5896558A (en) 1999-04-20
WO1998027672A1 (en) 1998-06-25

Similar Documents

Publication Publication Date Title
EP1826920B1 (en) Wireless communication using an airborne switching node
EP1247353B1 (en) Multi-beam satellite communications system
EP0748061B1 (en) Method and system for accounting resources used by a user terminal connection in a satellite communications system
DE69732078T2 (en) Aircraft based broadband communication network
US9793977B2 (en) Systems for recovery communications via airborne platforms
US7460830B2 (en) Inter-satellite crosslink communications system, apparatus, method and computer program product
EP0883252B1 (en) Method and system for providing wideband communications to mobile users in a satellite-based network
US5765098A (en) Method and system for transmitting radio signals between a fixed terrestrial station and user mobile terminals via a network of satellites
US5552920A (en) Optically crosslinked communication system (OCCS)
DE60218871T3 (en) Method and device for path detection between a mobile platform and a ground segment
US6272317B1 (en) Method and system for providing satellite coverage using fixed spot beams and scanned spot beams
US5926758A (en) Radio frequency sharing methods for satellite systems
EP1062747B1 (en) Method and apparatus for providing wideband services using medium and low earth orbit satellites
KR100407483B1 (en) Fixed and mobile satellite radiotelephone systems and methods with capacity sharing
US5839053A (en) System for transmitting radio signals from mobile terminals to provide space diversity for uplink signals via geostationary communication satellites
CA2440609C (en) Communications apparatus and method
US5884142A (en) Low earth orbit distributed gateway communication system
US7174127B2 (en) Data communications systems and methods using different wireless links for inbound and outbound data
US6950625B2 (en) Communications apparatus and method
US6735440B2 (en) Low earth orbit distributed gateway communication system
RU2153225C2 (en) Method for feedback power control in communication system using low-orbiting satellites
Colella et al. The HALO network/sup TM
Maral VSAT networks
US6628919B1 (en) Low-cost multi-mission broadband communications payload
EP1569363A1 (en) Communications apparatus and method

Legal Events

Date Code Title Description
STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION