System for determining position from suppressed carrier radio waves
First Claim
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1. A method of determining position information from orbiting satellites, comprising the steps of:
- forming a digital representation of a composite of overlapping spread spectrum signals received at a first position from a plurality of orbiting satellites;
distributing said digital representation to a plurality of parallel circuits operating synchronously in response to a common clock; and
observing each of a plurality of satellite specific signals in a different one of said parallel circuits to determine position information related to said first position.
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Abstract
Method and system for determining position from suppressed carrier signals transmitted by satellites in which a digital representation of the satellite signals is sampled and distributed for simultaneous measurement in synchronous parallel circuits. The phases of suppressed carriers implicit in the signals are combined in a time series of measurements with phase data from a second receiver to determine position.
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Citations
137 Claims
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1. A method of determining position information from orbiting satellites, comprising the steps of:
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forming a digital representation of a composite of overlapping spread spectrum signals received at a first position from a plurality of orbiting satellites; distributing said digital representation to a plurality of parallel circuits operating synchronously in response to a common clock; and observing each of a plurality of satellite specific signals in a different one of said parallel circuits to determine position information related to said first position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A system for determining position information comprising:
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an analog to digital converter responsive to a composite of overlapping spread spectrum signals received at a first position from a plurality of earth orbiting satellites for forming a digital representation of said composite; and a plurality of parallel circuits for determining position information related to said first position from said digital representation, each of said parallel circuits observing a satellite specific signal from a different one of said satellites. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78)
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79. A system for determining position information from orbiting satellites, comprising:
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means for forming a digital representation of a composite of overlapping spread spectrum signals received at a first position from a plurality of orbiting satellites; means for distributing said digital representation to a plurality of parallel circuits operating synchronously in response to a common clock; and means for observing each of a plurality of satellite specific signals in a different one of said parallel circuits to determine position information related to said first position. - View Dependent Claims (80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117)
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118. A method of determining receiver position information from a composite of spread spectrum signals received from a plurality of orbiting satellites, comprising the steps of:
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forming a digital representation of the composite of spread spectrum signals at a first receiver; applying said digital representation substantially simultaneously to a plurality of logic circuits operating synchronously in response to a common clock; substantially simultaneously measuring the signal received from each of said plurality of satellites in a separate one of said plurality of separate logic circuits to derive measurements of said signals with respect to a common reference signal; and determining receiver position information from a combination of said measurements. - View Dependent Claims (119, 120, 121, 122, 123, 124, 125, 126, 127)
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128. A system for determining receiver position information from a composite of spread spectrum signals received from a plurality of orbiting satellites, comprising:
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means for forming a digital representation of the composite of spread spectrum signals at a first receiver; means for applying said digital representation substantially simultaneously to a plurality of logic circuits operating synchronously in response to a common clock; means for substantially simultaneously measuring the signal received from each of said plurality of satellites in a separate one of said plurality of separate logic circuits to derive measurements of said signals with respect to a common reference signal; and means for determining receiver position information from a combination of said measurements. - View Dependent Claims (129, 130, 131, 132, 133, 134, 135, 136, 137)
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Specification