Dynamic Correlation Scheduling for GNSS Power Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
GNSS devices face challenges in power management, particularly in conditions with rapid variations, where they may fail to process signals effectively while in sleep mode, necessitating a more flexible architecture to balance power savings with operational reliability.
Innovation Solution
Implementing a dynamic correlation schedule for each correlation channel in a GNSS device, where the duty cycle is adjusted based on signal quality, device dynamics, dilution of precision, and fixed accuracy, allowing for periodic activation and deactivation of correlation channels to optimize power usage while ensuring continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the GNSS device enters sleep mode with correlation channels turned off periodically, then power consumption is minimized, but the device may be unable to process signals effectively in conditions with rapid variation
Solution Approach 1:
The patent segments the correlation channels into multiple independent units, each with its own correlation schedule. This allows individual channels to be turned on or off based on local signal conditions rather than shutting down all channels uniformly, enabling the device to maintain processing capability in specific frequency bands while saving power overall.
Solution Approach 2:
The patent implements dynamic correlation schedules that adapt to changing signal conditions. The schedules are adjusted based on signal quality metrics, allowing the system to transition between sleep mode and active processing modes flexibly, rather than using fixed periodic scheduling that cannot respond to rapid variations.
2Reliability
If the GNSS device uses a fixed wake up schedule with all components turned on, then the device can reliably process signals, but power consumption increases significantly
Solution Approach 1:
The patent divides the full correlation channel set into multiple independent schedules, allowing the system to activate only the necessary subset of channels based on signal conditions. This segmented approach enables reliable processing when needed while minimizing power consumption by keeping unrelated channels in sleep mode.
Solution Approach 2:
The patent applies different correlation schedules to different correlation channels based on their individual signal quality and requirements. Channels with strong, stable signals can use more aggressive power saving schedules, while channels with weak or varying signals maintain more continuous operation, optimizing the balance between power consumption and processing reliability.
3Use of energy by moving object
If the GNSS device turns off correlation channels to save power, then power consumption decreases, but the device complexity increases due to schedule management
Solution Approach 1:
The patent creates a universal correlation schedule management framework that handles multiple channels through standardized scheduling logic. This unified approach simplifies complexity by providing a single set of management rules that apply across all channels, rather than requiring separate management mechanisms for each channel.
Data Source
AI summary
A method and system for navigation are provided to locate a GNSS device. The GNSS device comprises a RF front end receiving satellite signals of a plurality of satellites, and a GNSS device comprising a plurality of correlation channels each performing a correlation process to generate a correlation result from satellite signals corresponding to a satellite, a memory device for storage of the correlation results, and a processor performing acquisition and tracking based on the correlation results.