System and method for geo-locating a receiver with reduced power consumption
First Claim
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1. A system for determining a position estimate for a remote asset comprising:
- at least one receiver located on the remote asset for collecting GPS signal information from multiple space vehicles and generating a signal delay for each of the multiple space vehicles, the receiver including an upload filter to select generated signal delays for transmission using predetermined criteria;
at least one transmitter located on the remote asset for transmitting the selected signal delays;
a ground station including a geo-location processor and a navigation database for receiving the transmitted signal delays and computing a position estimate for the remote asset.
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Abstract
A system and process for the geo-location of an asset given no a priori knowledge regarding time and location of the asset with minimized power consumption is disclosed. In the preferred embodiment, the system is accurate to about 30 meters CEP (50% circular error probable) using just a short segment, e.g., 100-200 ms, of digitized GPS L1 signal data.
30 Citations
18 Claims
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1. A system for determining a position estimate for a remote asset comprising:
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at least one receiver located on the remote asset for collecting GPS signal information from multiple space vehicles and generating a signal delay for each of the multiple space vehicles, the receiver including an upload filter to select generated signal delays for transmission using predetermined criteria; at least one transmitter located on the remote asset for transmitting the selected signal delays; a ground station including a geo-location processor and a navigation database for receiving the transmitted signal delays and computing a position estimate for the remote asset. - View Dependent Claims (2, 3, 4, 5)
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6. A method for determining a position estimate for a remote asset comprising:
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collecting GPS signal information from multiple space vehicles at the remote asset, the GPS signal information being transmitted from each of the multiple space vehicles at a known signal frequency; extracting a signal delay for each of the multiple space vehicles; selecting, by an upload filter at the remote asset, signal delays for transmission using predetermined criteria; transmitting the selected signal delays and identification information for each of the multiple space vehicles corresponding to the selected signal delays to a ground station; receiving at a ground station the transmitted signal delays and identification information from the remote asset; retrieving information from a navigation database; and computing a position estimate for the remote asset using the transmitted signal delays, the transmitted identification information corresponding to the signal delays, the information from the navigation database, and an estimated time of data collection at the remote asset. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification