PVT Optimization Architecture for Low-Power GPS
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Solution Overview
Problem
Conventional GPS receivers in battery-operated devices face power consumption constraints, limiting their ability to operate continuously and accurately in all conditions, especially under weak or absent satellite signals.
Innovation Solution
A Position-Velocity-Time (PVT) optimization architecture that reduces power consumption by preselecting appropriate satellites, processing pseudorange signals with reduced capacity, and utilizing 'hot zones' to optimize satellite visibility, allowing for continuous operation with minimal power usage even with fewer satellites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GPS receivers operate continuously with full processing capacity to maintain accurate position updates, then position accuracy and reliability are improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts processing capacity between two states: full capacity for initial position calculation and reduced capacity for updated position calculations. This dynamic adaptation allows the receiver to maintain position accuracy while reducing power consumption during continuous operation.
Solution Approach 2:
The system performs partial processing by using a limited number of pseudorange signals (less than all available signals) for updated position calculations. This partial action approach maintains sufficient position accuracy while significantly reducing the computational load and power consumption.
2Use of energy by moving object
If GPS receivers use reduced processing capacity to minimize power consumption, then power consumption is reduced, but ability to handle weak or absent satellite signals deteriorates
Solution Approach 1:
The system performs preliminary action by calculating the initial position and time bias using full processing capacity before transitioning to reduced capacity operation. This preliminary full-capacity calculation establishes accurate baseline values that enable subsequent reduced-capacity operations to maintain reliability even in weak signal conditions.
Solution Approach 2:
The system uses feedback by comparing updated position calculations with the initial position to determine whether to switch between full and reduced processing capacities. This feedback mechanism ensures that the receiver maintains appropriate processing capability based on current signal conditions while optimizing power consumption.
Data Source
AI summary
A method to reduce power consumption in a device is disclosed. The method generally includes the steps of (A) generating a plurality of pseudorange signals by tracking a plurality of position signals received from a plurality of satellites in a positioning system, at least one of the position signals from each one of the satellites respectively, (B) calculating both an initial position and an initial time bias from the pseudorange signals using a processing capability of the device at a normal capacity and (C) calculating both an updated position and an updated time bias using the processing capability reduced to a first capacity, wherein the first capacity (i) consumes less power than the normal capacity and (ii) is suitable to process the updated position and the updated time bias using a limited number comprising less than all of the pseudorange signals.