Patent US2299942A successfully refreshed from Google Patents.
US5014066A
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System for simultaneously deriving position information from a plurality of satellite transmissions
Assignee: Western Atlas International Inc
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Filing: 1989-07-20
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Granted: 1991-05-07
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Expires: 2009-07-20
Abstract
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. 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. Differences in Doppler shift are utilized to distinguish the carriers of different satellites. 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.
Inventors
- 👤 Charles C. Counselman, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:32
CPC Classifications
G; G01; G01S; G01S19/00; G01S19/38; G01S19/39; G01S19/42; G01S19/43; G01S19/44; G01C; G01C15/00; G01S19/01; G01S19/13; G01S19/35
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
122 words
A method of determining position information from a composite of spread spectrum, suppressed carrier signals transmitted simultaneously at the same frequencies by a plurality of orbiting satellites and received simultaneously from different directions by an antenna, comprising: (a) forming a digital representation of said composite; (b) applying said digital representation to a plurality of logic circuits, each said logic circuit being responsive to the signal transmitted by a different selected satellite and operating synchronously in response to a common clock; (c) deriving simultaneously, in each said logic circuit, data representing the signal transmitted by the satellite to which each said logic circuit is responsive; and (d) combining the simultaneously derived data from a plurality of said logic circuits to determined position information.
Claim 2
Independent Claim
122 words
A method of determining position information from a composite of spread spectrum, suppressed carrier signals transmitted simultaneously at the same frequencies by a plurality of orbiting satellites and received simultaneously from different directions by an antenna, comprising: (a) forming a digital representation of said composite; (b) applying said digital representation to a plurality of logic circuits, each said logic circuit being responsive to the signal transmitted by a different selected satellite and operating synchronously in response to a common clock; (c) deriving simultaneously, in each said logic circuit, data representing the signal transmitted by the satellite to which each said logic circuit is responsive; and (d) combining the simultaneously derived data from a plurality of said logic circuits to determined position information.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein the simultaneously derived data are related to the phases of carrier waves implicit in the signals received from the satellites.
Claim 4
Dependent Claim
22 words
The method of claim 2 wherein the digital representation of the composite is derived by sampling an analog representation of the composite.
Claim 5
Dependent Claim
20 words
The method of claim 3 wherein the analog representation is a spread spectrum signal received from a plurality of satellites.
Claim 6
Dependent Claim
13 words
The method of claim 4 wherein the analog representation is a baseband signal.
Claim 7
Dependent Claim
27 words
The method of claim 5 wherein the signal received from each said satellite is a double sideband signal and the baseband signal represents a selected sideband thereof.
Claim 8
Dependent Claim
126 words
Apparatus for determining position information from a composite of spread spectrum, suppressed carrier signals transmitted simultaneously at the same frequencies by a plurality of orbiting satellites and received simultaneously from different directions by an antenna, comprising: (a) means for forming a digital representation of said composite; (b) a plurality of logic circuits operating synchronously in response to a common clock, each said logic circuit being responsive to a signal transmitted by a different selected satellite included in said digital representation; (c) means in each said logic circuit for deriving simultaneously data representing the signal transmitted by the satellite to which each said logic circuit is responsive; and (d) means for combining the simultaneously derived data from a plurality of said logic circuits to determine position information.
Claim 9
Dependent Claim
126 words
Apparatus for determining position information from a composite of spread spectrum, suppressed carrier signals transmitted simultaneously at the same frequencies by a plurality of orbiting satellites and received simultaneously from different directions by an antenna, comprising: (a) means for forming a digital representation of said composite; (b) a plurality of logic circuits operating synchronously in response to a common clock, each said logic circuit being responsive to a signal transmitted by a different selected satellite included in said digital representation; (c) means in each said logic circuit for deriving simultaneously data representing the signal transmitted by the satellite to which each said logic circuit is responsive; and (d) means for combining the simultaneously derived data from a plurality of said logic circuits to determine position information.
Claim 10
Dependent Claim
39 words
The apparatus of claim 7 wherein the means in each logic circuit for simultaneously deriving data includes means for simultaneously deriving data related to the phase of a carrier wave implicit in the signal received from the selected satellite.
Claim 11
Dependent Claim
26 words
The apparatus of claim 8 wherein the means for forming a digital representation of the composite includes means for sampling an analog representation of the composite.
Claim 12
Dependent Claim
20 words
The apparatus of claim 9 wherein the analog representation is a spread spectrum signal received from a plurality of satellites.
Claim 13
Dependent Claim
13 words
The apparatus of claim 10 wherein the analog representation is a baseband signal.
Claim 14
Dependent Claim
27 words
The apparatus of claim 11 wherein the signal received from each said satellite is a double sideband signal and the baseband signal represents a selected sideband thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |