Fast GNSS receiver convergence by relative positioning
First Claim
1. A method of implementing GNSS convergence by relative positioning, the method comprising:
- shutting down a GNSS receiver, wherein the GNSS receiver is coupled with a GNSS antenna attached to a mobile machine, and wherein the GNSS receiver is in a converged state and the GNSS antenna is at a first location at shut down;
storing the first location of the GNSS antenna at shut down;
monitoring a movement sensor to determine whether a net movement of the GNSS antenna, while the GNSS receiver is shut down, exceeds a threshold net movement parameter; and
upon power up of the GNSS receiver, initiating a first convergence algorithm in response to determining that the net movement of the GNSS antenna, while the GNSS receiver is shut down, does not exceed the threshold net movement parameter, or that the net movement of the GNSS antenna, while the GNSS receiver is shut down, meets or exceeds the threshold net movement parameter but information from the movement sensor has been used to update a location of the GNSS antenna since shut down, wherein the first convergence algorithm comprises;
generating ionosphere-free phase observations based on code and phase observations received by the GNSS receiver upon power up;
generating ionosphere-free time delta phase observations based on the ionosphere-free phase observations, wherein integer ambiguity is cancelled in the ionosphere-free time delta phase observations;
generating least square estimations based on the ionosphere-free time delta phase observations and ephemeris satellite orbit and clock data received from a network of GNSS reference receivers, wherein the least square estimations result in one or more values, each value representing a change of the GNSS antenna'"'"'s position in a respective time interval of (t−
1, t); and
estimating a current location of the GNSS antenna by obtaining a sum of the one or more values resulted from the least square estimations and adding the stored first location of the GNSS antenna at shut down to the sum.
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Accused Products
Abstract
A method of implementing fast GNSS convergence by relative positioning is disclosed. A GNSS receiver which is coupled with a mobile machine is shut down. The GNSS receiver is in a converged state at shut down. A movement sensor is monitored to determine if net movement of a GNSS antenna coupled with the mobile machine exceeds a threshold net movement parameter while the GNSS receiver is shut down. Upon power up of the GNSS receiver, a shorter convergence algorithm is initiated in response to determining that the threshold net movement parameter has not been exceeded. The shorter convergence algorithm is also initiated upon power up of the GNSS receiver in response to determining that the threshold net movement parameter has been exceeded but information from the movement sensor has been used to update the location of the GNSS receiver since said shut down.
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Citations
20 Claims
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1. A method of implementing GNSS convergence by relative positioning, the method comprising:
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shutting down a GNSS receiver, wherein the GNSS receiver is coupled with a GNSS antenna attached to a mobile machine, and wherein the GNSS receiver is in a converged state and the GNSS antenna is at a first location at shut down; storing the first location of the GNSS antenna at shut down; monitoring a movement sensor to determine whether a net movement of the GNSS antenna, while the GNSS receiver is shut down, exceeds a threshold net movement parameter; and upon power up of the GNSS receiver, initiating a first convergence algorithm in response to determining that the net movement of the GNSS antenna, while the GNSS receiver is shut down, does not exceed the threshold net movement parameter, or that the net movement of the GNSS antenna, while the GNSS receiver is shut down, meets or exceeds the threshold net movement parameter but information from the movement sensor has been used to update a location of the GNSS antenna since shut down, wherein the first convergence algorithm comprises; generating ionosphere-free phase observations based on code and phase observations received by the GNSS receiver upon power up; generating ionosphere-free time delta phase observations based on the ionosphere-free phase observations, wherein integer ambiguity is cancelled in the ionosphere-free time delta phase observations; generating least square estimations based on the ionosphere-free time delta phase observations and ephemeris satellite orbit and clock data received from a network of GNSS reference receivers, wherein the least square estimations result in one or more values, each value representing a change of the GNSS antenna'"'"'s position in a respective time interval of (t−
1, t); andestimating a current location of the GNSS antenna by obtaining a sum of the one or more values resulted from the least square estimations and adding the stored first location of the GNSS antenna at shut down to the sum. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A non-transitory computer readable storage medium having computer readable instructions stored thereon for causing a computer system to perform a method of implementing GNSS convergence by relative positioning, the method comprising:
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shutting down a GNSS receiver, wherein the GNSS receiver is coupled with a GNSS antenna attached to a mobile machine, and wherein the GNSS receiver is in a converged state and the GNSS antenna is at a first location at shut down; storing the first location of the GNSS antenna at shut down; monitoring a movement sensor to determine whether a net movement of the GNSS antenna, while the GNSS receiver is shut down, exceeds a threshold net movement parameter; and upon power up of the GNSS receiver, initiating a first convergence algorithm in response to determining that the net movement of the GNSS antenna, while the GNSS receiver is shut down, does not exceed the threshold net movement parameter, or that the net movement of the GNSS antenna, while the GNSS receiver is shut down, meets or exceeds the threshold net movement parameter but information from the movement sensor has been used to update a location of the GNSS antenna since shut down, wherein the first convergence algorithm comprises; generating ionosphere-free phase observations based on code and phase observations received by the GNSS receiver upon power up; generating ionosphere-free time delta phase observations based on the ionosphere-free phase observations, wherein integer ambiguity is cancelled in the ionosphere-free time delta phase observations; generating least square estimations based on the ionosphere-free time delta phase observations and ephemeris satellite orbit and clock data received from a network of GNSS reference receivers, wherein the least square estimations result in one or more values, each value representing a change of the GNSS antenna'"'"'s position in a respective time interval of (t−
1, t); andestimating a current location of the GNSS antenna by obtaining a sum of the one or more values resulted from the least square estimations and adding the stored first location of the GNSS antenna at shut down to the sum. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A navigation system comprising:
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a Global Navigation Satellite System (GNSS) receiver coupled with a GNSS antenna which is attached to a mobile machine; a movement sensor configured to monitor movement of the GNSS antenna; and a processor configured to; cause the GNSS receiver to transition into a shut down state from a converged state where the GNSS antenna is at a first location; store the first location of the GNSS antenna at shut down; upon subsequent power up of the GNSS receiver, monitor a net movement of the GNSS antenna, while the GNSS receiver is shut down, using the movement sensor to determine whether the net movement of the GNSS antenna, while the GNSS receiver is shut down, exceeds a threshold net movement parameter; and initiate a first convergence algorithm in response to determining that the net movement of the GNSS antenna, while the GNSS receiver is shut down, does not exceed the threshold net movement parameter, or that the net movement of the GNSS antenna, while the GNSS receiver is shut down, meets or exceeds the threshold net movement parameter but information from the movement sensor has been used to update a location of the GNSS antenna since shut down, wherein the first convergence algorithm comprises; generating ionosphere-free phase observations based on code and phase observations received by the GNSS receiver upon power up; generating ionosphere-free time delta phase observations based on the ionosphere-free phase observations, wherein integer ambiguity is cancelled in the ionosphere-free time delta phase observations; generating least square estimations based on the ionosphere-free time delta phase observations and ephemeris satellite orbit and clock data received from a network of GNSS reference receivers, wherein the least square estimations result in one or more values, each value representing a change of the GNSS antenna'"'"'s position in a respective time interval of (t−
1, t); andestimating a current location of the GNSS antenna by obtaining a sum of the one or more values resulted from the least square estimations and adding the stored first location of the GNSS antenna at shut down to the sum. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification