公开(公告)号：JPH08331030A

公开(公告)日：1996-12-13

申请号：JP9977396

申请日：1996-04-22

Applicant: GLOBALSTAR LP ,  QUALCOMM INC

Inventor： WIEDEMAN ROBERT A ,  MONTE PAUL A ,  CARTER STEPHEN S ,  AMES WILLIAM

IPC: H04B7/26 ,  H04B7/15 ,  H04B7/155 ,  H04B7/185 ,  H04B7/195 ,  H04Q7/36

Abstract: PROBLEM TO BE SOLVED: To obtain a method which allocates communication links via plural satellites that are arranged on low earth orbits in response to a service request, by determining whether a satellite having a maximum elevation angle can be allocated to a new communication link, and if it is not allocated, then allocating it to a satellite having an elevation angle smaller than the maximum elevation angle. SOLUTION: Each satellite 12, 12' and 12" is separately provided with a receiver, which receives a communication link from a gateway 18 of a ground station and a transmitter which transmits a communication link to a user terminal 13. A ground operation control center GOCC 38 responds to a service request, determines whether a satellite 12 that has a maximum elevation angle is allocated to a new communication link or not and allocates the satellite 12 to the new communication link, when it is possible to allocate it. When it is not possible, it allocates a satellite 12' to the new communication link, after having determined whether the satellite 12' which has an elevation angle that is smaller than the maximum elevation angle can be allocated. If it cannot be allocated, it allocates a satellite 12" after similarly determining it.

公开(公告)号：MX9709884A

公开(公告)日：1998-08-30

申请号：MX9709884

申请日：1997-12-08

Applicant: GLOBALSTAR LP ,  QUALCOMM INC

Inventor： WIEDEMAN ROBERT A ,  MONTE PAUL A ,  CARTER STEPHEN S ,  AMES WILLIAM

IPC: H04B7/15 ,  H04B7/26 ,  H04B7/155 ,  H04B7/185 ,  H04B7/195 ,  H04Q7/36

Abstract: Un sistema y método para asignar tráfico de comunicacion a través de satélites en orbita terrestre baja; cada satélite es orientado, en cualquier momento dado cuando está a la vista de una estacion terrestre, a un ángulo de elevacion particular; el método incluye: proveer cada satélite con un receptor para recibir comunicacion de la estacion terrestre y un transmisor para transmitir comunicacion a terminales de usuario; en respuesta a una solicitud por servicio, determinar si un satélite con ángulo de elevacion mayor puede ser asignado un enlace nuevo de comunicacion; de ser así, asignar un enlace nuevo de comunicacion al satélite con ángulo de elevacion mayor; de no ser así, determinar si un segundo satélite con ángulo de elevacion mayor puede ser asignado un enlace nuevo de comunicacion; y de ser así, asignar un enlace nuevo de comunicacion al segundo satélite con ángulo de elevacion mayor; la asignacion depende del numero de enlaces de comunicacion y/o nivel de energía del haz del satélite; de preferencia, las terminales de usuario emplean recepcion de diversidad.

公开(公告)号：AT424663T

公开(公告)日：2009-03-15

申请号：AT99937339

申请日：1999-07-21

Applicant: QUALCOMM INC

Inventor： ANTONIO FRANKLIN ,  MARSH GENE ,  STEWART RICHARD ,  BJEREDE MARIE ,  CHOCKALINGAM ANANTHANARAYANAN ,  KERNS ARTHUR ,  BUTLER BRIAN ,  GROB MATTHEW ,  DETERMAN JAMES ,  GROVER DOUGLAS ,  SCHIFF LEONARD ,  AMES WILLIAM

IPC: H04B7/02 ,  H04B7/26 ,  H04B7/185 ,  H04Q7/36

Abstract: A method for reducing call dropping rates in a multi-beam communication system. The multi-beam communication system includes a user terminal, a gateway, and a plurality of beam sources, where each beam source projects a plurality of beams, and where a communication link between the user terminal and the gateway is established on one or more beams. The method according to the present invention relies on a messaging protocol between the gateway and the user terminal. Based on messages sent from the user terminal to the gateway, preferably on a preselected periodic basis, the gateway can determine the more desirable beam(s) for transmitting data or information to the user terminal. The messages sent from the user terminal to the gateway contain values representing beam strengths as measured at the user terminal. The gateway uses the user terminal measured beam strengths to select the beams that should be used for transmitting data or information to the user terminal. The beams that should be used are the beams that if used will decrease the call dropping rates and provide a desired level of beam source diversity.

公开(公告)号：BR9608951A

公开(公告)日：1999-12-14

申请号：BR9608951

申请日：1996-03-12

Applicant: GLOBALSTAR LIMITED PARTNERSHIP ,  QUALCOMM INC

Inventor： WIEDEMAN ROBERT A ,  MONTE PAUL A ,  CARTER STEPHEN S ,  AMES WILLIAM

IPC: H04B7/26 ,  H04B7/15 ,  H04B7/155 ,  H04B7/185 ,  H04B7/195 ,  H04Q7/36

Abstract: A communication system (10), and a method executed by same, for allocating communications traffic through a plurality of satellites (12) of a constellation of low earth orbit satellites. Each of the plurality of satellites is oriented, at any given time when in view of a ground station (18), at a particular elevation angle. The method comprises the steps of: (a) providing each of the plurality of satellites with a receiver for receiving communication links from the ground station and a transmitter for transmitting communication links to user terminals; (b) in response to a request for service, determining if a highest elevation angle satellite can be assigned a new communications link; (c) if yes, assigning a new communication link to the highest elevation angle satellite; (d) if no, determining if a second highest elevation angle satellite can be assigned a new communications link; and (e) if yes, assigning a new communication link to the second highest elevation angle satellite. A number of different criteria can be employed in determining if a satellite can be assigned a new communication link, including: determining if the associated satellite has already been assigned a predetermined maximum number of communication links; and determining if the associated satellite, or a particular beam, is transmitting at or near to a power level that corresponds to a maximum peak flux density at the surface of the earth. Each of the steps of assigning is preferably accomplished such that the communication link is simultaneously established through at least two of the satellites to provide for diversity reception at a user's terminal (13).

公开(公告)号：DE69032664T2

公开(公告)日：1999-05-12

申请号：DE69032664

申请日：1990-11-30

Applicant: QUALCOMM INC

Inventor： AMES WILLIAM ,  JACOBS IRWIN ,  WEAVER LINDSAY ,  GILHOUSEN KLEIN

IPC: G01S5/12 ,  G01S5/14 ,  G01S13/87 ,  G01S19/00 ,  G01S19/01 ,  G01S19/38 ,  G01S19/48 ,  H04B7/185 ,  G01S5/00 ,  G01S1/02

Abstract: A method and system for determining the position of an object using a fixed station and a plurality of earth orbit satellites whose positions are known. Separate periodic signals are transmitted from the fixed station via first and second satellites to the object whose postion is to be determined. The phase offset in periodic characteristics of the periodic signals as received from the first and second satellites is measured at the object. The phase offset corresponds to a relative time difference in propagation of the signals traveling two different paths to the object. The object transmits via the first satellite a return signal indicative of the measured relative time difference. This return signal is activated some time in the future according to the object local time, which is slaved to receipt of the periodic signal sent through the first satellite. This future time is the start of the particular time period as decided by the fixed station's schedule. At the fixed station, an instantaneous round trip delay, determined by the time offset of the current transmission clock time relative to the receive clock time of reception of the return signal, along with the measured relative time difference sent back on the return signal, is used to calculate the distances between the first and second satellites to the object. From these distances the position of the object is calculated.

公开(公告)号：CA2172303A1

公开(公告)日：1996-12-07

申请号：CA2172303

申请日：1996-03-21

Applicant: GLOBALSTAR LP ,  QUALCOMM INC

Inventor： WIEDEMAN ROBERT A ,  MONTE PAUL A ,  CARTER STEPHEN S ,  AMES WILLIAM

IPC: H04B7/26 ,  H04B7/15 ,  H04B7/155 ,  H04B7/185 ,  H04B7/195 ,  H04Q7/36 ,  H04B1/69

Abstract: A communication system (10), and a method executed by same, for allocating communications traffic through a plurality of satellites (12) of a constellation of low earth orbit satellites. Each of the plurality of satellites is oriented, at any given time when in view of a ground station (18), at a particular elevation angle. The method comprises the steps of: (a) providing each of the plurality of satellites with a receiver for receiving communication links from the ground station and a transmitter for transmitting communication links to user terminals; (b) in response to a request for service, determining if a highest elevation angle satellite can be assigned a new communications link; (c) if yes, assigning a new communication link to the highest elevation angle satellite; (d) if no, determining if a second highest elevation angle satellite can be assigned a new communications link; and (e) if yes, assigning a new communication link to the second highest elevation angle satellite. A number of different criteria can be employed in determining if a satellite can be assigned a new communication link, including: determining if the associated satellite has already been assigned a predetermined maximum number of communication links; and determining if the associated satellite, or a particular beam, is transmitting at or near to a power level that corresponds to a maximum peak flux density at the surface of the earth. Each of the steps of assigning is preferably accomplished such that the communication link is simultaneously established through at least two of the satellites to provide for diversity reception at a user's terminal (13).

公开(公告)号：AU5309196A

公开(公告)日：1996-12-24

申请号：AU5309196

申请日：1996-03-12

Applicant: GLOBALSTAR LP ,  QUALCOMM INC

Inventor： WIEDEMAN ROBERT A ,  MONTE PAUL A ,  CARTER STEPHEN S ,  AMES WILLIAM

IPC: H04B7/26 ,  H04B7/15 ,  H04B7/155 ,  H04B7/185 ,  H04B7/195 ,  H04Q7/36

Abstract: A communication system (10), and a method executed by same, for allocating communications traffic through a plurality of satellites (12) of a constellation of low earth orbit satellites. Each of the plurality of satellites is oriented, at any given time when in view of a ground station (18), at a particular elevation angle. The method comprises the steps of: (a) providing each of the plurality of satellites with a receiver for receiving communication links from the ground station and a transmitter for transmitting communication links to user terminals; (b) in response to a request for service, determining if a highest elevation angle satellite can be assigned a new communications link; (c) if yes, assigning a new communication link to the highest elevation angle satellite; (d) if no, determining if a second highest elevation angle satellite can be assigned a new communications link; and (e) if yes, assigning a new communication link to the second highest elevation angle satellite. A number of different criteria can be employed in determining if a satellite can be assigned a new communication link, including: determining if the associated satellite has already been assigned a predetermined maximum number of communication links; and determining if the associated satellite, or a particular beam, is transmitting at or near to a power level that corresponds to a maximum peak flux density at the surface of the earth. Each of the steps of assigning is preferably accomplished such that the communication link is simultaneously established through at least two of the satellites to provide for diversity reception at a user's terminal (13).

公开(公告)号：UA42068C2

公开(公告)日：2001-10-15

申请号：UA97125823

申请日：1996-03-12

Applicant: GLOBALSTAR LP ,  QUALCOMM INC

Inventor： VIDMAN ROBERT A ,  MONTY PAUL A ,  KARTER STEVEN S ,  AMES WILLIAM

IPC: H04B7/26 ,  H04B7/15 ,  H04B7/155 ,  H04B7/185 ,  H04B7/195 ,  H04Q7/36

Abstract: Винахідвзагалівідноситьсядоретранслюючихсистемзв'язку. Спосіброзподілуканалівзв'язкуміжсупутникамисукупності, щостворюєнизькоорбітальнесузір'я, коженз якиху кожниймоментчасузнаходженняу полізоруназемноїстанціїі абонентамаєпевнийкутпіднесення, причомувключаєзабезпеченнякожногоз сукупностісупутниківприймачемдляприйомуповідомленьвідназемноїстанції, передавачемдляпередачіповідомленьдоабонентів, приймачемдляприйомуповідомленьвідабонентіві передавачемдляпередачіповідомленьдоназемноїстанції, зазапитомнаобслуговуваннявизначенняможливостіпризначенняновогоканалузв'язкусупутнику, щомаєнайвищийкутпіднесення, якщоцеможливо, призначенняновогоканалузв'язкусупутнику, щомаєнайвищийкутпіднесення, якщотакепризначеннянеможливе, визначенняможливостіпризначенняновогоканалузв'язкусупутнику, щомаєнижчийкутпіднесення; іякщоцеможливо, призначенняновогоканалузв'язкусупутнику, щомаєнижчийкутпіднесення, іу якомукожназ стадійвизначеннявключаєстадіювизначення, чибудесупутникзнаходитисьу полізоруякабонента, такі наземноїстанціїпротягомзаздалегідьвизначеногочасуі, якщоні, супутникє неприйнятнимдляпризначенняновогоканалузв'язку.

公开(公告)号：DE69032664D1

公开(公告)日：1998-10-22

申请号：DE69032664

申请日：1990-11-30

Applicant: QUALCOMM INC

Inventor： AMES WILLIAM ,  JACOBS IRWIN ,  WEAVER LINDSAY ,  GILHOUSEN KLEIN

IPC: G01S5/12 ,  G01S5/14 ,  G01S13/87 ,  G01S19/00 ,  G01S19/01 ,  G01S19/38 ,  G01S19/48 ,  H04B7/185 ,  G01S5/00 ,  G01S1/02

Abstract: A method and system for determining the position of an object using a fixed station and a plurality of earth orbit satellites whose positions are known. Separate periodic signals are transmitted from the fixed station via first and second satellites to the object whose postion is to be determined. The phase offset in periodic characteristics of the periodic signals as received from the first and second satellites is measured at the object. The phase offset corresponds to a relative time difference in propagation of the signals traveling two different paths to the object. The object transmits via the first satellite a return signal indicative of the measured relative time difference. This return signal is activated some time in the future according to the object local time, which is slaved to receipt of the periodic signal sent through the first satellite. This future time is the start of the particular time period as decided by the fixed station's schedule. At the fixed station, an instantaneous round trip delay, determined by the time offset of the current transmission clock time relative to the receive clock time of reception of the return signal, along with the measured relative time difference sent back on the return signal, is used to calculate the distances between the first and second satellites to the object. From these distances the position of the object is calculated.

公开(公告)号：AU695589B2

公开(公告)日：1998-08-20

申请号：AU5309196

申请日：1996-03-12

Applicant: GLOBALSTAR LP ,  QUALCOMM INC

Inventor： WIEDEMAN ROBERT A ,  MONTE PAUL A ,  CARTER STEPHEN S ,  AMES WILLIAM

IPC: H04B7/26 ,  H04B7/15 ,  H04B7/155 ,  H04B7/185 ,  H04B7/195 ,  H04Q7/36

Abstract: A communication system (10), and a method executed by same, for allocating communications traffic through a plurality of satellites (12) of a constellation of low earth orbit satellites. Each of the plurality of satellites is oriented, at any given time when in view of a ground station (18), at a particular elevation angle. The method comprises the steps of: (a) providing each of the plurality of satellites with a receiver for receiving communication links from the ground station and a transmitter for transmitting communication links to user terminals; (b) in response to a request for service, determining if a highest elevation angle satellite can be assigned a new communications link; (c) if yes, assigning a new communication link to the highest elevation angle satellite; (d) if no, determining if a second highest elevation angle satellite can be assigned a new communications link; and (e) if yes, assigning a new communication link to the second highest elevation angle satellite. A number of different criteria can be employed in determining if a satellite can be assigned a new communication link, including: determining if the associated satellite has already been assigned a predetermined maximum number of communication links; and determining if the associated satellite, or a particular beam, is transmitting at or near to a power level that corresponds to a maximum peak flux density at the surface of the earth. Each of the steps of assigning is preferably accomplished such that the communication link is simultaneously established through at least two of the satellites to provide for diversity reception at a user's terminal (13).