GNSS Signal Acquisition Adaptive Doppler Search
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Solution Overview
Problem
Current global navigation satellite systems (GNSS) face challenges in reducing the time required to acquire satellite signals, which affects their performance.
Innovation Solution
A method and apparatus that adjust the Doppler frequency search start value and interval values in a 2D search area formed by Doppler frequency and code delay, with adaptive changes based on detection thresholds and conditions to optimize satellite signal acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a fixed Doppler frequency search start value and interval are used, then the signal acquisition process is simple, but the time required to acquire satellite signals increases
Solution Approach 1:
The patent applies dynamics by making the Doppler frequency search start value and interval variable rather than fixed. The system dynamically adjusts these parameters based on the number of satellites successfully detected, transitioning from a static search process to an adaptive one that responds to real-time signal acquisition results
Solution Approach 2:
The patent implements parameter changes by modifying the Doppler frequency search start value and interval based on detection conditions. When the number of detected satellites meets a threshold, the system changes these parameters to optimize the search process, directly addressing the time-loss issue through parameter optimization
2Productivity
If the Doppler frequency search start value is changed adaptively, then the satellite signal acquisition time is reduced, but the control complexity increases
Solution Approach 1:
The patent implements feedback by using the detection result (number of successfully detected satellites) to control subsequent search parameter adjustments. The controller monitors acquisition results and feeds this information back to modify the Doppler frequency search parameters, creating a closed-loop system that improves productivity through intelligent adaptation
Solution Approach 2:
The system applies self-service by automatically adjusting its own search parameters based on detected satellite conditions. The controller autonomously modifies the Doppler frequency search start value and interval without external intervention, enabling the system to optimize its own performance and improve acquisition speed
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the time needed to acquire satellite signals by dynamically adjusting search parameters, improving the overall performance of the GNSS system.
Implementation Method 1
performing a first satellite signal acquiring operation based on an initially set Doppler frequency search start value and an initially set Doppler frequency search interval value
Data Source
AI summary
A method and an apparatus for acquiring a signal of a global navigation satellite system (GNSS) are provided. The method includes: performing a first satellite signal acquiring operation based on an initially set Doppler frequency search start value and an initially set Doppler frequency search interval value; and changing the initially set Doppler frequency search start value and performing a second satellite signal acquiring operation when a satellite signal is not found through the first satellite signal acquiring operation.