• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The mobile satellite communication terminal 2 of the present invention includes a portable computer 68, an interface card 8 including an intermediate frequency (IF) conversion circuit 28 and 52, and a high frequency (RF) conversion circuit 34 ( Antenna assembly 10 including antenna 50 and antenna 44. The interface card 8 is connected to the antenna assembly 10 by a detachable cable, which carries an intermediate frequency signal. Such a structure reduces high frequency power loss and interference. The antenna 44 may be manually adjusted to face the earth geostationary or similar earth geostationary satellite 12. The navigation signal antenna 56 is mounted to the antenna assembly 10 and can be adjusted separately from the antenna 44 so that it can be aligned vertically, which is an optimal position to receive navigation signals. Antenna assembly 10 includes direction detectors 70 and 75 which calculate the difference between the current direction of antenna 44 and the correct direction. This difference is visible to the user and allows the user to manually adjust the antenna 44.
    公开号:KR20010012612A
    申请号:KR1019997010571
    申请日:1998-05-13
    公开日:2001-02-15
    发明作者:브로턴죤윌리엄
    申请人:인마샛 리미티드；
    IPC主号:
    专利说明:

    Satellite device with omni-directional and manually adjustable directional antenna {SATELLITE APPARATUS WITH OMNIDIRECTIONAL AND MANUALLY STEERABLE DIRECTIONAL ANTENNA}
    The term 'quasi-geostationary' includes, individually or collectively, satellites that do not move too much to the user during communication and satellites that the user does not need to know exactly about the location of the satellite as a function of time. do. Thus, even if the satellites have the same stationary orbit with slight orbital inclination relative to the equator, the latitude deviation of the satellites is not important to the user. In addition, satellites can stay for several hours in an area of the Earth's surface near the origin in an elliptical orbit, such as the LOOPUS orbit. If the call is handed off to another satellite so that the satellite available to the user is always within the range of position covered by the user antenna without any adjustments during communication, the satellites in such an orbit are Can move badly against.
    In a satellite communication system using a geostationary orbit satellite, the user terminal usually communicates with the satellite using a directional antenna to provide satisfactory gains in the communication link with the satellite. The directional antenna must be pointed towards the earth geostationary satellite.
    One example of such a system is the Inmarsat-B ™ system, which is primarily designed for ship terminals. Such antenna assemblies for terminals are large and typically include parabolic antennas of 0.9 m diameter with stabilizers and automatic satellite tracking devices.
    Another example of such a system is the Inmarsat-M ™ system, which is identical in many respects to the Inmarsat-B ™ design architecture, but can support smaller user terminals, including briefcase size portable terminals.
    The advent of multiple spot beams passing through the satellites and earth geostationary satellites, such as the Inmarsat-3 TM satellites, which have high power and sensitivity, have reduced the minimum gain required for user terminals for use with satellites . Thus, it is possible to provide a high bandwidth communication service to a user terminal of a laptop computer size. However, the instruments required for satellite tracking cannot be scaled down that much. Therefore, the antenna for the portable satellite terminal is adjusted to face the satellite by manual operation.
    In patent EP 0 570 325 a portable satellite communication terminal is disclosed wherein the antenna is planar and lies in a briefcase lid with a high frequency transmitter receiver, which lid is connected to a laptop computer. The briefcase lid can be maintained at another inclination to point to the antenna facing the satellite, and the azimuth direction is obtained by rotating the briefcase. When the user's longitude and latitude are entered into the computer to manually point in the direction, the computer displays the correct orientation and altitude for the antenna. However, even if the user knows the azimuth and altitude of the satellite, it is not a simple matter to point the antenna in that direction.
    The patent US 5,347,286 discloses another approach in which the antenna pointing satellite is automated by a GPS receiver and two GPS antennas mounted on the communication antenna. This approach requires at least two servo motors and their associated gear assemblies to direct the antenna to the air. The entire antenna assembly is sized to fit in the suitcase, while the communication terminal must be carried in another suitcase. Thus, the necessary equipment is inconvenient for personal mobile communication.
    The present invention relates to a satellite communication device and method, but in particular it is not exclusively related to a satellite communication device connectable or connected to a communication terminal and capable of communicating with an earth geostationary or pseudo earth geostationary satellite.
    1 illustrates a satellite communication system capable of communicating with a mobile terminal.
    FIG. 2 shows components of a mobile terminal for use with the system shown in FIG.
    3A to 3D show a front view, a side view, a back view, and a side view when the antenna assembly of the user terminal is in the operating position, respectively.
    4A-4D show a top view, a side view, a top view of a cable with a user interface card attached thereto, and a front view of an interface card inserted into a portable computer.
    Fig. 5 shows a screen of a portable computer for manually installing an antenna.
    6 illustrates a screen of a portable computer that allows a user to enter the terminal location.
    7 shows an arrangement for electronically determining the tilt of an antenna.
    8 shows an arrangement for electronically determining the azimuth angle of the antenna.
    9 is a flow chart of how a user points to an antenna.
    10 shows a display located in an antenna housing for a user to point at the antenna.
    The portable satellite communication antenna according to the present invention for achieving the above object is further equipped with an antenna to receive a navigation signal such as GPS or GLONASS signal. The inclination of the communication antenna is manually adjusted to point to the earth geostationary orbital earth orbit, and the navigation antenna is directly adjusted upward.
    With the above structure, the satellite communication and the navigation equipment can be easily integrated, and the navigation antenna and the communication antenna can point to the optimum direction.
    Preferably, the navigation antenna can be leaned on or placed in a communication antenna assembly to facilitate transportation or storage.
    In the satellite communication apparatus according to the present invention for achieving the above object, the high frequency transceiver is divided into two separate parts. One is an intermediate frequency part that converts a baseband signal into an intermediate frequency signal and vice versa, and the other is a high frequency conversion part that converts an intermediate frequency signal into a high frequency signal or vice versa. The intermediate frequency part is integrated with the interface circuit to be connected to the general purpose computer, and the high frequency conversion part can be integrated with the satellite antenna assembly. Intermediate frequency signals are carried between each part by means of cables and appropriate connection means such as the appropriate cable connectors provided in each part.
    Separation of the intermediate frequency part and the high frequency part as described above is advantageous for the following reasons. Keeping the high frequency part close to the antenna reduces the loss of passing high frequency signals through the cable and the need to use expensive coaxial cables required for such connections. The request for power amplification at high frequency is also reduced. Moreover, separating the high frequency stage from the interface stage reduces the interference of the high frequency stage from the computer internal circuitry. It can also be used in portable computers by making the intermediate frequency step small enough to fit in a small interface card such as a PCMCIA card.
    In addition, the same intermediate frequency step may be connected to different high frequency steps and antennas, and the high frequency steps and antennas may be necessary if the same communication terminal is used with different systems or in different countries using different frequency bands for satellite communication. have.
    The satellite communication apparatus according to the present invention for achieving the above object senses the orientation of the satellite communication antenna, compares the orientation with the correct orientation for satellite communication, and displays to the user how to adjust the orientation to obtain the correct orientation. Such a structure facilitates the installation of the satellite communication antenna since the user does not have to deal with the absolute value of the direction and only needs to adjust the antenna until it is indicated exactly as indicated. The indications are displayed using a separate indicator located near the antenna or display of the computer connected to the communication device, so that the user does not need to look at the computer display while adjusting the antenna.
    System overview
    1 shows a satellite communication system disclosed in British patent GB9625475.0, to which reference is made here.
    1 shows a mobile terminal 2 connected to a network management center 18 via a satellite 12, which allocates bandwidth to the mobile terminal and connects the mobile terminal to the terrestrial network 22. FIG. Connect to In this embodiment, the mobile terminal 2 comprises a portable computer, which can execute a number of different communication applications (4a) (4b) 4c (4d). For example, the application may be a voice telephony application, an internet based application, a facsimile application and an ATM network based application. Each application uses standard application programming interfaces (APIs) such as Winsock for Internet access, TAPI for telephony applications, and CAPI for ISDN applications. The interface to such an application is shown at I2 in FIG. The drive software 6 converts the API protocol into an appropriate protocol designed for a satellite communication system. The mobile terminal 2 supplies the physical interface I4 to the interface card 8, such as a PC (formally PCMCIA) card. The drive software 6 can be executed by a processor in the interface card 8 and / or by a processor in the mobile terminal.
    The interface card 8 is connected to the antenna assembly 10 via a high frequency modulator. The high frequency modulator may be received on the first frequency channel and simultaneously transmitted on the second frequency channel.
    The antenna assembly 10 is located in an area that the spot beam B generated by the satellite 12 can cover, and the satellite 12 has a multi-beam transmit / receive antenna, for example, so that a plurality of spot beams B Earth geostationary satellite for transmitting and receiving signals in the). Each spot beam B carries a number of frequency channels in the forward and reverse directions. The satellite also transmits and receives a global beam (G), which has a cover area sufficiently or completely beyond the area covered by the spot beam (B). The global beam G carries at least one forward and one reverse frequency channel.
    The high frequency signal transmitted between the antenna assembly 10 and the satellite 12 conforms to the air interface protocol I3, which is detailed in British patent GB 9625475.0. The satellite 12 acts as a relay and converts the channel from the multi-spot beam B to the channel in the feeder beam F and vice versa. The feeder beam F links between the satellite 12 and the ground station 16 via the ground station antenna 14. The air interface protocol for the feeder beam F is indicated by I3F in FIG.
    The network management center 18 is connected with the ground station 16 and provides a number of different service adapters 20a, 20b, 20c that provide an interface to the terrestrial network 22, such as a PSTN, ATM network, or ISDN ( 20d). For example, the service adapter 20 may include a telephony adapter 20a that includes a codec that converts the voice signal on the PSTN to data or vice versa at the network management center 18. The facsimile service adapter 20b may implement a facsimile protocol as defined in ITU Recommendations T.30 and T.40, and may include a modem capable of communicating with the PSTN. The Internet service adapter 20c implements TCP / IP and the ATM service adapter 20d implements the ATM protocol. The standard protocols and interfaces are shown overall in I1 in FIG.
    The mobile terminal 2 allows a number of different communication types to be installed in satellite communication systems such as telephony, the Internet, fax and ATM. These applications can run concurrently. The bandwidth allocated to each application can vary independently in the forward and reverse directions during the call period, as disclosed in British patent GB9625475.0.
    Antenna and Interface Components
    2 shows the components of the interface card 8 and the antenna assembly 10 in more detail. The interface card 8 includes input / output circuitry 24 that complies with the PC card standard, through which baseband communication signals are transferred between a portable computer and a variable bit rate (VBR) interface 26. Exchanged. The VBR interface 26 may be implemented by a DSP that buffers the received data and the data to be transmitted, and implements a communication protocol compatible with the drive software 6. The operation of the VBR interface 26 and the interface card 8 is controlled by the control processor 27.
    When the baseband signal B O is output by the VBR interface 26 to the modulator 36 and then to the IF up converter 28, the intermediate frequency up converter performs channel selection. do. Thus, the baseband signal B O is upconverted to an intermediate frequency signal IF O in the frequency range of about 65 MHz.
    Intermediate frequency signal (IF O) are output to the cable 32 via a cable connector (not shown), the cable is removably connected to the cable connector. The other end of the cable 32 is connected to the cable connector of the antenna assembly 10 so as to be removable. In the antenna assembly 10, the intermediate frequency signal IF O is upconverted to high frequency by a high frequency upconverter 34 that generates a high frequency signal RF O in the about 3 GHz frequency range. The high frequency upconverter 34 may include one stage mixer with a low pass filter.
    The high frequency signal RF O is then amplified by the power amplifier 38 and output through the diplexer 42 to the antenna 44. The antenna 44 includes an array fixed with a microstrip patch having four elements mounted as described below.
    The high frequency signal RF I received by the antenna 44 passes through the diplexer 42 and amplified by the low noise amplifier 48 and provides a gain of 15-20 dB and a 1 dB noise value. The amplified and received high frequency signal RF I includes a post amplifier and is down-converted by a high frequency downconverter for generating a received intermediate frequency signal IF I of about 65 MHz and outputted to the cable 32. .
    In the interface card 8, the received intermediate frequency signal IF I is down-converted by the down converter 52 which performs channel selection and demodulated by the demodulator 30 and input to the baseband processor 26. It generates a reception baseband signal (I B).
    The interface card 8 and antenna assembly 10 are powered by the battery of a laptop computer. The power connection is not shown for clarity. In addition, the antenna assembly 10 may be powered by a separate battery mounted therein.
    Optionally, the antenna assembly may include a omnidirectional antenna 56 capable of receiving signals from GPS / NAVSTAR and / or GLONASS satellites, and a navigation modulating and decoding navigation signal to generate navigation information, such as in the NEMA standard format. And a signal receiver 59. The navigation information is output via the cable 32 and processed by the control processor 27 for selecting the necessary information, which is output through the input / output circuit 24 to the portable computer. In addition, the navigation information can be output directly to the portable computer via the input / output circuit 24, so that the navigation information can be used for other applications.
    Antenna and Interface Structure
    Physical shapes and structures of the antenna assembly 10 are shown in FIGS. 3 (a) -3 (d). The antenna assembly 10 includes a housing 54 made of one plate made of plastic poured in a size of 21 cm x 30 cm x 2.5 cm. An array of four microstrip patch antennas 44a to 44d is mounted on the front of the housing 54 to form the antenna 44. The beam width of the antenna is approximately 30 ° to 40 °.
    The patch antenna can be planar with the front face of the housing 54 as shown in FIG. 3 (a) or beneath the housing surface and covered by the surface of the housing, thereby being protected by the housing and invisible to the user. Thus, the surface appears to be a flat, flat plastic surface that is resistant to damage and dirt.
    The GPS patch antenna 56 is mounted to a support 58, which is attached to the top surface of the housing 54 by a hinge. The GPS patch antenna 56 has a beam pattern that is omnidirectional with respect to the A axis that is perpendicular to the patch and perpendicular to the front of the support 58 so that it is sufficient above the horizon when the A axis of the GPS antenna 56 is approximately vertical. A signal can be received from any NAVSTAR satellite with an elevation angle. However, if the beam pattern is not isotropic, for example given a beam width of approximately 160 °, the beam pattern does not reach the minimum elevation angle when the A axis is vertical. Instead of a patch antenna, a helix antenna can be mounted and used in a stick-shaped housing.
    In use, the antenna assembly 10 is angled such that the boresight B of the antenna 44 is tilted at the correct angle i to point to the satellite 12. The antenna assembly 10 is supported in an inclined position by a U-shaped support arm 60 made of a metal tube or other suitably rigid material. The support arm 60 is connected to either side of the housing by a rotary joint 62 to cause the support arm 60 to rotate in a horizontal axis with respect to the housing 54. The friction value of the rotary joint can be set or adjustable so that the antenna assembly can be safely in a tilted position, but the tilt angle can be easily adjusted. In use, scale B is tilted within the range between the minimum operable altitude angle of satellite 12, such as 10 °, and the ceiling with housing 54 flat on the back.
    Other components of the antenna assembly 10 are mounted to the back of the housing 54. The relative positions of diplexer 40, power amplifier 38, low voltage amplifier 48 and GPS receiver 59 are shown in FIG. 3C. The location of the control and regulation circuit 64 for the power amplifier 38 is also shown. The upper portion of the rear of the housing 54 has a storage space 66, which can be stored with the cable 32 when the interface card 8 is not used.
    When not in use, the GPS antenna support 58 may be folded and closely attached to the back of the housing 54 as shown in FIG. 3C. Thus, the entire antenna assembly 10 and the interface card 8 can be stored in a small space, such as a bag into which a laptop computer fits, so that the satellite communication terminal is the same size or smaller than the bag carrying the laptop computer. I can carry it in a bag of the size.
    The appearance of the interface card 8 is shown in Figs. 4A to 4D. The interface card 8 has a width and a thickness of the second type PC card and has a first portion 8a for transmitting the input / output connector to the distal end portion, and a second portion 8b thicker than the first portion and for transferring the cable connector to the distal end portion 8b. Has The second portion 8b has components of an interface card that cannot fit into the first portion 8a. As shown in Fig. 4D, the first portion 8a fits into the PC card slot of the laptop computer 68, while the second portion 8b pops out of the slot. As the components required for the interface card 8 are minimized and the power consumption increases, the components can also enter the first potion 8a so that the interface card 8 is a standard length PC card with a cable connector at its outer end. Can be made.
    Alternatively, the interface card 8 where the desktop computer is used instead of the laptop computer 68 may be an ISA or PCI card mounted to the desktop computer.
    Antenna orientation calculation methods
    Adjustment of the satellite antenna 44 is made manually by positioning the antenna assembly 10 in the correct azimuth direction and adjusting the inclination, so that the scale B is within a certain angle along the beam width of the antenna 44. 12). If one or more satellites 12 are at a position above the minimum elevation angle, one satellite 12 is selected. The method for causing the user to execute the function will be described in detail.
    In one embodiment, the current position of the terminal 2 can be calculated once the output from the GPS receiver 59 is input to the laptop computer 68 via the interface card 8. The calculation is performed by the GPS receiver 59 and the longitude and latitude information is output to the laptop computer 68 via the interface card 8. The software running on the laptop computer 68 determines which satellite 12 has the highest elevation angle at the location determined by the GPS receiver, calculates the altitude and horizontal direction for the satellite, and provides this information to the user. Display. One example of a display when using the Windows-95 ™ user interface is shown in FIG. The 'ocean' entry identifies which satellite is selected.
    The display also indicates the current strength of the signal, which allows the user to confirm that the antenna 44 is pointing in the correct direction. In addition to this, the laptop computer 68 may generate a sound indicating the signal strength.
    In another embodiment where GPS information is not needed, laptop computer 68 displays a world map with a cover area that overlaps with the position of satellite 12 as shown in FIG. The user uses the pointing device to move until the cross-shaped pointer is at the user's location and then clicks on the pointing device to enter the location. The exact horizontal direction and altitude for the satellite 12 is displayed to the user as shown in the example of FIG.
    Pointing aids
    Reference will be made to the improvement of the antenna assembly 10 to help the user correctly point the antenna 44.
    In one embodiment, there is a scale near one rotary joint 62 to visually indicate the scale elevation angle of the antenna 44. In addition, as shown in Fig. 7, a rotation position sensor 70 including a rotatable potentiometer is mounted on one rotary joint 62 and the slider is connected to the support arm 60, and a resistance wire is provided. Is connected to the housing 54 and vice versa. The voltage of the slider is amplified by the amplifier 72 and converted into digital values by an A / D converter 72 mounted in the housing 54. The output of the A / D converter 72 is fed through the line of cable 32 to the interface card 8 and then to the laptop computer 68.
    The compass 74 may be mounted on the antenna assembly 10 to indicate the azimuth direction. In addition, an electronic compass comprising a Hall effect magnetometer 75 is mounted at a suitable location such as on the GPS antenna support 58 as shown in FIG. The controller 76 reads the voltage of the magnetometer 75 and outputs data indicating the orientation. The data is output to laptop computer 68 via cable 32 and interface card 8.
    Software running on the laptop computer 68 performs a method such as that shown in FIG. 9 to point the user at the antenna 44. Initially during installation, GPS data is input at the GPS receiver (step 80) and the correct horizontal orientation and tilt of the preferred satellite 12 is calculated (step 82). Direction data is input from the controller 76 and the A / D converter 72 to determine the actual current position of the antenna 44 (step 84). The difference between the actual position and the correct orientation is calculated (step 88). This difference is displayed to the user (step 90). The process from step 84 to step 90 is repeated, rotating the entire antenna assembly 10 at an azimuth angle, and rotating the support arm 60 until the difference displayed to the user in step 90 is sufficiently small to allow the housing 54 to be rotated. By adjusting the tilt, the user can adjust the antenna.
    In order to indicate the difference in step 90 one or more of the following forms are required. The difference can be displayed on the screen of the laptop computer 68 in the form of a graphic such that the arrow points up or down if the tilt increases or decreases and the size of the arrow changes proportionally according to the required adjustment. Likewise, the necessary change in azimuth is displayed by arrows pointing left and right.
    The difference can be displayed by a display device mounted in an LED, LCD, or other housing 54 and controlled by the output of the laptop computer 68 via the interface card 8. For example, FIG. 10 shows an LCD display on the top surface of a housing 54 having an arrow display element 94 and an inclined display element 96. One of the arrow display elements 94 is activated at any one time to point in the horizontal direction relative to the satellite 12, and the tilt display element 96 indicates how many degrees the tilt will increase or decrease.
    The difference may be known to the user by sound means generated by the laptop computer, such as a tone or synthesized verbal command.
    The current signal strength is also displayed on the display mounted to the housing to confirm that it is pointing correctly to the antenna 44.
    Instead of the examples mentioned above, other devices may be used that detect the direction electronically. For example, the potentiometer 70 has the disadvantage of measuring only the inclination along the plane in which the antenna assembly is located, without measuring the true inclination of the antenna. An electronic inclinometer can be used instead to read the absolute value of the inclination.
    The GPS antenna support 58 is mounted and weighted freely to rotate so that it has a vertically aligned GPS antenna axis position due to the effects of gravity. This eliminates the need for the user to adjust the GPS antenna instead of adding more weight. When not in use, the GPS antenna support is supported in the housing 54.
    The GPS antenna support 58 may rest on or in the housing 54 in a number of different ways. For example, housing 54 may include an exhaust plate or groove where the support will be when the support 58 is not in use.
    The antenna assembly 10 may have a separate antenna for transmission and reception instead of one antenna 44 and a diplexer, which eliminates the need for a diplexer and additionally requires a surface area for the antenna.
    The above-mentioned device may be modified to receive a navigation signal different from the GPS signal, such as a GLONASS signal and / or a different correction signal transmitted by a ground station or satellite. Other navigational signals may be received from satellite 12 by antenna 44.
    The user terminal 2 has been described in accordance with a conventional laptop computer, with rapid reference development in displays, processors, storage, batteries and other areas enabling smaller and more powerful portable computers, with more speech recognition and touch input. It is obvious that it will be universal. It is also clear that new operating systems and interface standards will emerge. The above embodiments can be modified to accommodate the advantages of technical development without departing from the gist of the present invention.
    权利要求:
    Claims (18)
    [1" claim-type="Currently amended] A satellite antenna device connectable to or connected to a satellite communication terminal,
    A manually adjustable directional antenna for communicating with an earth geostationary or quasi earth geostationary satellite; And
    A omnidirectional antenna having an axis in which the reception characteristic of the omnidirectional antenna is omnidirectional;
    And the omnidirectional antenna is mounted to the directional antenna to rotate in at least one direction independent of the direction of the directional antenna when the omnidirectional antenna axis is in use to align the omnidirectional antenna axis to a substantially vertical axis.
    [2" claim-type="Currently amended] The method of claim 1,
    And the omnidirectional antenna is connected to the directional antenna via a hinged coupling.
    [3" claim-type="Currently amended] The method according to claim 1 or 2,
    The directional antenna is mounted in the housing, the omnidirectional antenna can be leaned on or loaded into the housing when not in use.
    [4" claim-type="Currently amended] The method according to any one of claims 1 to 3,
    And the omnidirectional antenna is a navigation antenna for receiving navigation signals.
    [5" claim-type="Currently amended] The method according to any one of claims 1 to 4,
    And a support structure for supporting the directional antenna at a tilt angle set manually within a tilt range.
    [6" claim-type="Currently amended] An interface unit having an intermediate frequency converter for converting the baseband transmission signal into an intermediate frequency transmission signal and converting the intermediate frequency reception signal into a baseband reception signal, the interface unit being connected to the satellite communication terminal; And
    A high frequency unit converting the intermediate frequency transmission signal into a high frequency transmission signal and converting a high frequency reception signal into the intermediate frequency reception signal
    Including,
    The high frequency unit includes an integrated antenna device for transmitting the high frequency transmission signal and receiving the high frequency reception signal,
    The interface unit and the high frequency unit are arranged in a unit that can be separated separately,
    The interface unit has an input for the intermediate frequency reception signal and an output for the intermediate frequency transmission signal,
    The high frequency unit has an input for the intermediate frequency transmission signal and an output for the intermediate frequency reception signal.
    Satellite communication device.
    [7" claim-type="Currently amended] The method of claim 6,
    The interface unit input may be detachably connected to the high frequency unit output and the interface unit output may be detachably connected to the high frequency unit output by a cable.
    [8" claim-type="Currently amended] The method according to claim 6 or 7,
    And a interface card detachable from the interface unit.
    [9" claim-type="Currently amended] The method according to any one of claims 6 to 8,
    And an interface processor for processing the output data from the satellite communication terminal to generate the baseband transmission signal, and processing the baseband reception signal to generate input data for input to the communication terminal. Device.
    [10" claim-type="Currently amended] The method according to any one of claims 6 to 9,
    And an integrated navigation signal receiver for receiving the navigation signal by the high frequency unit and outputting navigation information to the interface unit for input to the communication terminal.
    [11" claim-type="Currently amended] An apparatus for assisting a satellite communication terminal user to direct a manually operable antenna to an earth geostationary or quasi earth geostationary satellite.
    Means for inputting data indicative of the antenna position;
    Means for determining orientation in at least one satellite communication antenna direction;
    Means for deriving a difference between the determined orientation of the antenna and a desired orientation for directing the antenna toward the satellite at an angle; And
    Means for displaying the difference to a user.
    [12" claim-type="Currently amended] The method of claim 11,
    And said input means comprises a navigation signal receiver.
    [13" claim-type="Currently amended] The method of claim 11,
    And a user input device to which the input means is connected to the satellite communication terminal.
    [14" claim-type="Currently amended] The method according to claim 12 or 13,
    And said display means comprises a display coupled to said communication terminal.
    [15" claim-type="Currently amended] The method according to any one of claims 11 to 14,
    And the display means is located in the housing for the antenna.
    [16" claim-type="Currently amended] The method according to any one of claims 11 to 15,
    And said determining and deriving means comprises a processor in said communication terminal.
    [17" claim-type="Currently amended] 17. A satellite communications terminal user assistance device according to any one of claims 11 to 16 comprising the antenna.
    [18" claim-type="Currently amended] A satellite communication terminal comprising the device of any one of claims 1 to 17.
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    同族专利:
    公开号 | 公开日
    GB2325347B|2002-07-17|
    CA2289646A1|1998-11-19|
    WO1998052301A3|1999-03-18|
    AU739911B2|2001-10-25|
    AU7346398A|1998-12-08|
    GB9709795D0|1997-07-09|
    WO1998052301A2|1998-11-19|
    EP0981913A2|2000-03-01|
    JP2001506102A|2001-05-08|
    US6542117B1|2003-04-01|
    EP0981913B1|2002-02-20|
    DE69803926D1|2002-03-28|
    GB2325347A|1998-11-18|
    DE69803926T2|2002-10-10|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1997-05-14|Priority to GB9709795.0
    1997-05-14|Priority to GB9709795A
    1998-05-13|Application filed by 인마샛 리미티드
    2001-02-15|Publication of KR20010012612A
    优先权:
    申请号 | 申请日 | 专利标题
    GB9709795.0|1997-05-14|
    GB9709795A|GB2325347B|1997-05-14|1997-05-14|Satellite communications apparatus and method|
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