Structure of a position processing apparatus
First Claim
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1. A global positioning system receiver, comprising:
- a local clock generator circuit generating a clock signal;
a local code synchronizer circuit generating a local code;
a carrier clock recovery circuit generating a carrier clock signal;
a plurality of antennae installed at different locations for receiving a plurality of ranging signals;
a processing circuit for processing said ranging signals and for determining carrier phase differences between said ranging signals, said signal processing circuit being coupled to receive said clock signal, said local code, and said carrier clock signal; and
an attitude determination computer for determining an attitude of said platform based on said carrier phase differences.
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Abstract
A method and apparatus for determining attitude information using a down conversion reference and a carrier phase and code phase generator. The apparatus uses individual phase registers for signal received from each antenna to solve the phase difference concurrently. The invention also discloses an attitude sensing method where only one receiving antenna is required. A method and structure for using variable correlation width is also disclosed to optimize noise cancellation under different noise environment.
44 Citations
23 Claims
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1. A global positioning system receiver, comprising:
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a local clock generator circuit generating a clock signal; a local code synchronizer circuit generating a local code; a carrier clock recovery circuit generating a carrier clock signal; a plurality of antennae installed at different locations for receiving a plurality of ranging signals; a processing circuit for processing said ranging signals and for determining carrier phase differences between said ranging signals, said signal processing circuit being coupled to receive said clock signal, said local code, and said carrier clock signal; and an attitude determination computer for determining an attitude of said platform based on said carrier phase differences. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A global positioning system receiver capable of measuring attitude, comprising:
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an antenna for receiving a plurality of ranging signals; antenna attenuating means for selectively attenuating signal reception from a selected direction, an attitude determination circuit for comparing an amplitude of received signal without using said attenuating means and an amplitude with said attenuating means to determine the direction from which the signals originate and thus an estimate of the attitude of the receiver. - View Dependent Claims (10)
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11. A global positioning system receiver, comprising:
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a digital signal processing circuit for down converting and correlating a plurality of ranging signals; a local code synchronizer circuit coupled to said digital signal processing circuit for providing locally generated code sequences to said digital signal processing circuit, said local code synchronizer dynamically adjusts the time difference between an early and a late codes to optimize code sequence matching and satellite lock up. - View Dependent Claims (12, 13, 14)
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- 15. A digital wireless communication processing circuit comprising a plurality of digital processing channels each being dynamically assignable to one of a plurality of signal input leads for receiving and processing a plurality of down converted IF global positioning system signals, global positioning system differential correction signal, and communication signal.
Specification