Dynamic Coherent Integration for GNSS Signal Acquisition
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Solution Overview
Problem
Mobile devices face challenges in acquiring and tracking GNSS signals due to poor antenna efficiency, harsh signal environments, jamming, and strict power consumption requirements, which degrade the signal-to-noise ratio and affect location determination accuracy.
Innovation Solution
Dynamic coherent integration techniques are employed, adjusting the coherent integration interval based on user activity, dynamics, and clock stability to enhance signal-to-noise ratio, compensate for interference, and conserve power without sacrificing location accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coherent integration interval is extended to improve signal-to-noise ratio, then sensitivity is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of coherent integration interval based on real-time signal conditions, user motion state, and clock stability. The system transitions from fixed integration intervals to variable intervals that adapt to changing environmental conditions, allowing extension only when necessary to improve signal-to-noise ratio while conserving power in favorable conditions.
Solution Approach 2:
The system changes multiple parameters simultaneously including coherent integration interval, non-coherent integration interval, and tracking loop bandwidth based on signal quality metrics, carrier-to-noise density measurements, and motion detection data. This multi-parameter adaptation allows optimization of the balance between signal acquisition performance and power consumption.
2Measurement precision
If coherent integration interval is extended to compensate for poor antenna gain, then sensitivity is improved, but acquisition time increases
Solution Approach 1:
The system dynamically adjusts coherent integration interval based on real-time carrier-to-noise density measurements and signal quality assessments. When signal quality is poor (indicating poor antenna gain or harsh environment), the system extends coherent integration to improve sensitivity. When signal quality is good, the system uses shorter intervals to reduce acquisition time, creating a dynamic balance between sensitivity improvement and acquisition speed.
3Measurement precision
If coherent integration is used to improve sensitivity in harsh environments, then signal acquisition is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service mechanisms where the GNSS receiver automatically monitors its own signal quality, carrier-to-noise density, and tracking performance, then autonomously adjusts coherent and non-coherent integration intervals without external intervention. The system also uses onboard sensors (accelerometers, gyroscopes) to detect user motion and automatically compensates for motion-induced signal degradation, reducing the need for complex external compensation systems.
4Ease of operation
If fixed coherent integration interval is used, then implementation is simple, but adaptability to different signal conditions is poor
Solution Approach 1:
The system transitions from static fixed integration intervals to dynamic variable intervals that automatically adapt to different signal conditions. The receiver continuously monitors signal quality, carrier-to-noise density, and environmental factors, then adjusts coherent and non-coherent integration intervals in real-time to optimize performance across varying conditions including indoor environments, urban canyons, and jamming scenarios.
Data Source
AI summary
Systems, methods and computer program products for determining extended coherent integration intervals based on information about user activity, dynamics and clock stability. Dynamically extending the coherent integration interval increases the signal-to-noise ratio during signal acquisition and tracking, thereby providing a benefit when antenna gain is poor, in weak signal conditions, and when being jammed, or when power needs to be conserved, compared to extending the coherent integration interval for a fixed amount of time.