GNSS Cross-Correlation Detection for Low-Power Signal Tracking
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Solution Overview
Problem
GNSS receivers face cross-correlation issues when tracking multiple signals from a satellite, leading to inaccurate geographic location determination due to energy from untracked signals being erroneously detected as signals from different satellites, which degrades accuracy and increases power consumption.
Innovation Solution
Implementing methods for cross-correlation detection by tracking both signals simultaneously in separate channels, time-sharing, switching between signals, or deriving measurements from a tracked signal to reduce the number of tracking channels and power consumption, including constant-value, calibration-value, and peak-value derivations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a receiver tracks only one signal from a satellite to reduce the number of tracking channels and power consumption, then hardware resources and energy usage are reduced, but cross-correlation errors increase causing false alarms and degraded positioning accuracy
Solution Approach 1:
The patent introduces a cross-correlation detection mechanism that acts as an intermediary between the tracked signal and the positioning function. This detector monitors for cross-correlation effects caused by untracked signals and provides correction information, allowing the system to track only one signal while maintaining positioning accuracy through the mediating detection and correction process
2Reliability
If a receiver tracks both signals from a satellite simultaneously to eliminate cross-correlation issues, then positioning accuracy is improved, but the number of tracking channels and power consumption increase
Solution Approach 1:
The patent extracts the cross-correlation detection function from the full signal tracking process. Instead of tracking both signals completely, the system extracts only the necessary cross-correlation information by processing the tracked signal through a dedicated detection mechanism that identifies cross-correlation effects, thereby achieving accuracy improvement without the full complexity of dual signal tracking
3Reliability
If a receiver tracks both signals from a satellite simultaneously to eliminate cross-correlation issues, then positioning accuracy is improved, but power consumption increases
Solution Approach 1:
The patent applies partial action by implementing cross-correlation detection that processes only the necessary information from the tracked signal to identify cross-correlation effects. The detection mechanism performs partial processing (monitoring for cross-correlation patterns rather than full signal analysis) to achieve accuracy improvement with minimal additional power consumption compared to tracking both signals fully
Data Source
AI summary
A system and a method are disclosed for cross-correlation detection. The method includes receiving, by a receiver, a first signal of a first satellite and a second signal of the first satellite, selecting, by the receiver, the first signal to be a tracked signal, selecting, by the receiver, the second signal to be an untracked signal, tracking, by the receiver, the first signal, generating, by the receiver, a first measurement based on the tracking of the first signal, determining, by the receiver, a second measurement of the second signal based on the first measurement, and performing an operation on the receiver based on the second measurement.