Method for improving clock accuracy in a wide area positioning pseudolite receiver system architecture
First Claim
1. A computer-implemented method of determining a frequency drift of a clock of a mobile communication device, comprising:
- receiving a first positioning signal at a first receiver of the mobile communication device controlled by the clock;
receiving a second positioning signal at a second receiver of the mobile communication device controlled by the clock;
determining a first position from the first positioning signal, wherein the first position indicates a first geographic position of the mobile communication device;
determining a second position from the second positioning signal, wherein the second position indicates a second geographic position of the mobile communication device;
determining a difference between the first position and the second position; and
determining the frequency drift from the difference between the first position and the second position.
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Accused Products
Abstract
A method, apparatus and computer-readable medium for determining a frequency drift of clock of a mobile communication device is disclosed. A first positioning signal, such as M-LMS signals, is received at a first positioning engine of the mobile communication device controlled by the clock. A second positioning signal, such as GNSS signals, is received at a second positioning engine of the mobile communication device controlled by the clock. A first position is determined from the first positioning signal, and a second position is determined from the second positioning signal. A difference between the first position and the second position is determined, and the frequency drift of the clock is determined from the difference between the first position and the second position. The frequency drift determined may be subsequently applied to the clock, and thus enhance the accuracy of M-LMS positioning when GNSS signals are unreliable.
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Citations
20 Claims
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1. A computer-implemented method of determining a frequency drift of a clock of a mobile communication device, comprising:
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receiving a first positioning signal at a first receiver of the mobile communication device controlled by the clock; receiving a second positioning signal at a second receiver of the mobile communication device controlled by the clock; determining a first position from the first positioning signal, wherein the first position indicates a first geographic position of the mobile communication device; determining a second position from the second positioning signal, wherein the second position indicates a second geographic position of the mobile communication device; determining a difference between the first position and the second position; and determining the frequency drift from the difference between the first position and the second position. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for determining a frequency drift of a clock of a mobile communication device, comprising:
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a first receiver of the mobile communication device configured to determine a first position of the mobile communication device using a terrestrial-based positioning signal received at the mobile communication device, wherein the first position indicates a first geographic position of the mobile communication device; a second receiver of the mobile communication device configured to determine a second position of the mobile communication device using a Global Navigation Satellite System (GNSS) positioning signal received at the mobile communication device, wherein the second position indicates a second geographic position of the mobile communication device; a clock configured to control the first receiver and the second receiver; and a processor configured to; determine a difference between the first position and the second position, and determine a frequency drift of the clock from the difference between the first position and the second position. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A non-transitory computer-readable medium having stored thereon a set of instructions that when accessed by a processor enable the processor to perform a method for determining a frequency drift of a clock in a mobile communication device, the method comprising:
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receiving a first positioning signal at a first receiver of the mobile communication device controlled by the clock; receiving a second positioning signal at a second receiver of the mobile communication device controlled by the clock; determining a first position from the first positioning signal, wherein the first position indicates a first geographic position of the mobile communication device; determining a second position from the second positioning signal, wherein the second position indicates a second geographic position of the mobile communication device; determining a difference between the first position and the second position; determining the frequency drift from the difference between the first position and the second position. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification