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公开(公告)号：JPH08146111A
公开(公告)日：1996-06-07
申请号：JP11525295
申请日：1995-04-18
Applicant: WESTERN ATLAS INT INC
Inventor： COUNSELMAN CHARLES C III
Abstract: PURPOSE: To measure the power and carrier wave phase of a radio signal received from an artificial satellite by combining signal simultaneously received from a plurality of artificial satellites into a composite signal. CONSTITUTION: In order to a base line vector, interferometer field terminals 13-1 and 13-2 having computers are situated on each end of a base line. Before a measurement is started, for example, data from first and second data memory devices 17, 19 showing the orbits of artificial satellites GPS1, GPS2 are inputted into a computer 15 together with the proximity data of positions of measurement marks SM1, SM2. The computer 15 generates a predicted value of Dappler frequency transition in table form as the function of time from these artificial satellite orbits and measuring position data. The power and phase of a carrier wave latent in the signal received from each artificial satellite GPS1, 2 are determined, and the data is stored in the field terminal 13-1, 13-2, and finally returned to the central computer 15.
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2.发明授权
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公开(公告)号：AU629728B2
公开(公告)日：1992-10-08
申请号：AU6994991
申请日：1991-01-24
Applicant: WESTERN ATLAS INT INC
Inventor： COUNSELMAN CHARLES C III
IPC: G01C15/00 , G01S1/00 , G01S5/02 , G01S5/14 , G01S19/11 , G01S19/32 , G01S19/37 , G01S19/40 , G01S5/10 , H04B7/185
Abstract: Method and apparatus are disclosed for accurately deter- mining position from GPS satellites (12, 13, 14) and received on a ship (10) using the following observable signals: C/A code group delay observable tau ; 308 f0 implicit carrier phase observable phi ; L1 band implicit f0 carrier residual phase observable psi L1; and L2 band implicit f0 carrier residual phase observable psi L2. A precise measurement of the group-phase delay range to each satellite is made based upon the L1 center frequency carrier phase. A correction for ionospheric effects is determined by simultaneous observation of the group delays of the wide bandwidth P code modulations in both the L1 and L2 bands. These group delays are determined by measuring the phases of carrier waves implicit in the spread-spectrum signals received in both bands. These carriers are reconstructed from both the L1 and L2 band signals from each satellite without using knowledge of the P code. The unknown biases in the L1 center frequency carrier phase range measurements are determined from simultaneous, pseudorange measurements, with time averaging. The instantaneous position of the ship (10) may then be determined from the ranges so determined, with both the bias and the ionospheric effects having been eliminated.
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公开(公告)号：SE460685B
公开(公告)日：1989-11-06
申请号：SE8301066
申请日：1983-02-25
Applicant: WESTERN ATLAS INT INC
Inventor： COUNSELMAN CHARLES C III
Abstract: A method and a system are disclosed for measuring the baseline vector b between a pair of survey marks on the ground by radio interferometry using radio signals broadcast from the earth orbiting satellites of the NAVSTAR Global Positioning System (GPS), the radio signals broadcast by the satellites being double-sideband modulated with their carriers suppressed. An antenna is positioned at each survey mark. The signals received by one antenna during a predetermined time span are separated into upper and lower sideband components. These separate components are filtered, converted to digital form, and then multiplied together. Their product is analyzed digitally by means of correlation with quadrature outputs of a local oscillator to determine the power, and the phase relative to that local oscillator, of the carrier wave that is implicit in the double-sideband signal being received from each satellite. Differences in Doppler shift are utilized to distinguish the carriers of different satellites. The signals received at the same time by the other antenna are processed in the same manner. Thus, the powers and carrier phases of the signals from a plurality of satellites are measured simultaneously and numerical data representing the measurement results are obtained at each survey mark. The measurements are performed in real time at each mark without reference to signals that are received at any other place and without knowledge of any of the coded signals that modulate the GPS carriers. The data from the measurements performed simultaneously but independently at the two survey marks.
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公开(公告)号：SE8802377D0
公开(公告)日：1988-06-23
申请号：SE8802377
申请日：1988-06-23
Applicant: WESTERN ATLAS INT INC
Inventor： COUNSELMAN CHARLES C III
Abstract: A method and a system are disclosed for measuring the baseline vector b between a pair of survey marks on the ground by radio interferometry using radio signals broadcast from the earth orbiting satellites of the NAVSTAR Global Positioning System (GPS), the radio signals broadcast by the satellites being double-sideband modulated with their carriers suppressed. An antenna is positioned at each survey mark. The signals received by one antenna during a predetermined time span are separated into upper and lower sideband components. These separate components are filtered, converted to digital form, and then multiplied together. Their product is analyzed digitally by means of correlation with quadrature outputs of a local oscillator to determine the power, and the phase relative to that local oscillator, of the carrier wave that is implicit in the double-sideband signal being received from each satellite. Differences in Doppler shift are utilized to distinguish the carriers of different satellites. The signals received at the same time by the other antenna are processed in the same manner. Thus, the powers and carrier phases of the signals from a plurality of satellites are measured simultaneously and numerical data representing the measurement results are obtained at each survey mark. The measurements are performed in real time at each mark without reference to signals that are received at any other place and without knowledge of any of the coded signals that modulate the GPS carriers. The data from the measurements performed simultaneously but independently at the two survey marks.
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Patent Agency Ranking
公开(公告)号：DK163197B
公开(公告)日：1992-02-03
申请号：DK85983
申请日：1983-02-24
Applicant: WESTERN ATLAS INT INC
Inventor： COUNSELMAN CHARLES C III
Abstract: A method and a system are disclosed for measuring the baseline vector b between a pair of survey marks on the ground by radio interferometry using radio signals broadcast from the earth orbiting satellites of the NAVSTAR Global Positioning System (GPS), the radio signals broadcast by the satellites being double-sideband modulated with their carriers suppressed. An antenna is positioned at each survey mark. The signals received by one antenna during a predetermined time span are separated into upper and lower sideband components. These separate components are filtered, converted to digital form, and then multiplied together. Their product is analyzed digitally by means of correlation with quadrature outputs of a local oscillator to determine the power, and the phase relative to that local oscillator, of the carrier wave that is implicit in the double-sideband signal being received from each satellite. Differences in Doppler shift are utilized to distinguish the carriers of different satellites. The signals received at the same time by the other antenna are processed in the same manner. Thus, the powers and carrier phases of the signals from a plurality of satellites are measured simultaneously and numerical data representing the measurement results are obtained at each survey mark. The measurements are performed in real time at each mark without reference to signals that are received at any other place and without knowledge of any of the coded signals that modulate the GPS carriers. The data from the measurements performed simultaneously but independently at the two survey marks.
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7.发明专利
公开(公告)号：FI82556C
公开(公告)日：1991-03-11
申请号：FI830619
申请日：1983-02-24
Applicant: WESTERN ATLAS INT INC
Inventor： COUNSELMAN CHARLES C III
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公开(公告)号：CA1291252C
公开(公告)日：1991-10-22
申请号：CA533208
申请日：1987-03-27
Applicant: WESTERN ATLAS INT INC
Inventor： COUNSELMAN CHARLES C III
IPC: G01C15/00 , G01S1/00 , G01S5/02 , G01S5/14 , G01S19/11 , G01S19/32 , G01S19/37 , G01S19/40 , G01S5/10 , G01S5/12
Abstract: Method and apparatus are disclosed for accurately determining position from GPS satellites and received on a ship using C/A code group delay observable ?, 308 fo implicit carrier phase observable ?, L1 band implicit fo carrier residual phase observable ?L1, and L2 band implicit fo carrier residual phase observable ?L2. A precise measurement of the group-phase delay range to each satellite is made based upon the L1 center frequency carrier phase. A correction for ionospheric effects is determined by simultaneous observation of the group delays of the wide bandwidth P code modulations in both the L1 and L2 bands. These group delays are determined by measuring the phases of carrier waves implicit in the spread-spectrum signals received in both bands. These carriers are reconstructed from both the L1 and L2 band signals from each satellite without using knowledge of the P code. The unknown biases in the L1 center frequency carrier phase range measurements are determined from simultaneous, pseudorange measurements, with time averaging. The instantaneous position of the ship may then be determined from the ranges so determined, with both the bias and the ionospheric effects having been eliminated.
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公开(公告)号：FI82556B
公开(公告)日：1990-11-30
申请号：FI830619
申请日：1983-02-24
Applicant: WESTERN ATLAS INT INC
Inventor： COUNSELMAN CHARLES C III
Abstract: A method and a system are disclosed for measuring the baseline vector b between a pair of survey marks on the ground by radio interferometry using radio signals broadcast from the earth orbiting satellites of the NAVSTAR Global Positioning System (GPS), the radio signals broadcast by the satellites being double-sideband modulated with their carriers suppressed. An antenna is positioned at each survey mark. The signals received by one antenna during a predetermined time span are separated into upper and lower sideband components. These separate components are filtered, converted to digital form, and then multiplied together. Their product is analyzed digitally by means of correlation with quadrature outputs of a local oscillator to determine the power, and the phase relative to that local oscillator, of the carrier wave that is implicit in the double-sideband signal being received from each satellite. Differences in Doppler shift are utilized to distinguish the carriers of different satellites. The signals received at the same time by the other antenna are processed in the same manner. Thus, the powers and carrier phases of the signals from a plurality of satellites are measured simultaneously and numerical data representing the measurement results are obtained at each survey mark. The measurements are performed in real time at each mark without reference to signals that are received at any other place and without knowledge of any of the coded signals that modulate the GPS carriers. The data from the measurements performed simultaneously but independently at the two survey marks.
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公开(公告)号：NO871042L
公开(公告)日：1987-10-15
申请号：NO871042
申请日：1987-03-13
Applicant: WESTERN ATLAS INT INC
Inventor： COUNSELMAN CHARLES C III
IPC: G01C15/00 , G01S1/00 , G01S5/02 , G01S5/14 , G01S19/11 , G01S19/32 , G01S19/37 , G01S19/40 , G01S
Abstract: Method and apparatus are disclosed for accurately deter- mining position from GPS satellites (12, 13, 14) and received on a ship (10) using the following observable signals: C/A code group delay observable tau ; 308 f0 implicit carrier phase observable phi ; L1 band implicit f0 carrier residual phase observable psi L1; and L2 band implicit f0 carrier residual phase observable psi L2. A precise measurement of the group-phase delay range to each satellite is made based upon the L1 center frequency carrier phase. A correction for ionospheric effects is determined by simultaneous observation of the group delays of the wide bandwidth P code modulations in both the L1 and L2 bands. These group delays are determined by measuring the phases of carrier waves implicit in the spread-spectrum signals received in both bands. These carriers are reconstructed from both the L1 and L2 band signals from each satellite without using knowledge of the P code. The unknown biases in the L1 center frequency carrier phase range measurements are determined from simultaneous, pseudorange measurements, with time averaging. The instantaneous position of the ship (10) may then be determined from the ranges so determined, with both the bias and the ionospheric effects having been eliminated.
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