NAVIGATIONAL POSITIONING WITHOUT TIMING INFORMATION
First Claim
1. A method of determining position of a navigation receiver, comprising:
- resolving an integer ambiguity in a pseudorange measurement at the receiver;
reconstructing the pseudorange measurement with the resolved integer ambiguity; and
using the reconstructed pseudorange measurement to determine the position of the receiver.
4 Assignments
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Accused Products
Abstract
Provided herein are systems and methods that enable a navigation receiver to determine receiver position using a low ppm (Parts Per Million) Real Time Clock (RTC) under weak satellite signal reception conditions without the need for timing information from navigation satellites or aiding systems. Under weak signal conditions, the receiver is unable to demodulate navigation data bits but may be able to synchronize with the one ms PN sequences and 20 ms data bit edges of a received signal. In this case, the receiver is unable to determine the signal travel time from the navigation data bits resulting in one ms and/or 20 ms integer ambiguities in the travel time. Systems and methods are provided for resolving these one ms and/or 20 ms integer ambiguities and correct or reconstruct the pseudorange measurements accordingly. The reconstructed pseudorange measurements are used to accurately determine the receiver position.
26 Citations
32 Claims
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1. A method of determining position of a navigation receiver, comprising:
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resolving an integer ambiguity in a pseudorange measurement at the receiver; reconstructing the pseudorange measurement with the resolved integer ambiguity; and using the reconstructed pseudorange measurement to determine the position of the receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A navigation receiver, comprising:
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a satellite signal receiver, wherein the satellite signal receiver receives navigation signals from satellites and makes pseudorange measurements on the received navigation signals; a computation modules coupled to the satellite signal receiver, wherein the computation module resolves an integer ambiguity in a pseudorange measurement from the satellite signal receiver, and reconstructs the pseudorange measurement using the resolved integer ambiguity; and a position determination module coupled to the computation module, wherein the position determination module uses the reconstructed pseudorange measurement to determine a position of the receiver. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification