GPS Receiver Sampling Rate Dynamics for Power and Accuracy
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Solution Overview
Problem
Existing GPS receivers face a trade-off between power consumption reduction and position calculation accuracy, as methods that reduce power consumption, such as sampling at an integer multiple of the chip rate, result in broader correlation calculation peaks and lower measurement data accuracy.
Innovation Solution
A method that involves generating two data strings from received satellite signals, one sampled at a non-integer multiple of the chip rate for tracking and another at an integer multiple for capturing, allowing for prioritization of power reduction during capture and accuracy during tracking, with the latter data string being generated through conversion calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the received signals are sampled at a sampling rate of an integer multiple of the chip rate of C/A codes, then power consumption is reduced, but accuracy of measurement data deteriorates
Solution Approach 1:
The patent dynamically switches between two sampling modes: integer multiple sampling rate for power-saving operation and non-integer multiple sampling rate for high-accuracy measurement. This dynamic adjustment allows the system to optimize between power consumption and measurement accuracy based on operational requirements
Solution Approach 2:
The patent changes the sampling rate parameter between two specific values: an integer multiple of the chip rate for low-power operation and a non-integer multiple for high-accuracy measurement. This parameter switching resolves the contradiction by allowing the system to adapt to different operational states
2Measurement precision
If the received signals are sampled at a sampling rate of a non-integer multiple of the chip rate of C/A codes, then accuracy of measurement data is improved, but power consumption increases
Solution Approach 1:
The system dynamically selects the sampling rate based on the current operational phase (acquisition vs. tracking), using non-integer multiple sampling during tracking for accuracy while switching to integer multiple sampling during acquisition for power savings
Solution Approach 2:
The patent performs preliminary acquisition using integer multiple sampling to quickly capture the satellite signal, then switches to non-integer multiple sampling for precise tracking and measurement, avoiding the need to maintain high-accuracy sampling throughout the entire operation
Data Source
AI summary
A method includes tracking positioning satellite signal using a first data string obtained by sampling received signal of the positioning satellite signal at a first sampling rate that is a non-integer multiple of a chip rate, and capturing the positioning satellite signal using a second data string obtained by sampling the received signal at a second sampling rate that is an integer multiple of the chip rate.