GNSS Antenna Tuning States for Thermal-Stable Signal Acquisition
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Solution Overview
Problem
Global navigation satellite system (GNSS) devices face challenges in achieving precise timing during signal acquisition due to temperature fluctuations, which affect the accuracy of location determination, as crystal oscillators' frequency varies with temperature changes, leading to interference between L1 and L5 antennas and inefficient signal processing.
Innovation Solution
Implementing thermal management techniques to stabilize the mobile device's temperature by identifying and controlling thermal processes, assigning thermal scores, and dynamically adjusting antenna tuning states based on thermal states and signal types to optimize antenna performance for accurate GNSS signal acquisition and tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple antennas (L1 and L5) are used for GNSS signal reception, then location accuracy is improved, but antenna interference increases and tuning independence is reduced
Solution Approach 1:
The patent segments the antenna system into independent L1 and L5 antenna elements with separate tuning circuits. Each antenna can be tuned independently to its optimal frequency range, preventing mutual interference while maintaining the ability to receive both L1 and L5 GNSS signals for improved location accuracy
Solution Approach 2:
The patent applies local quality by optimizing each antenna element for its specific frequency range. The L1 antenna is tuned specifically for L1 frequency signals while the L5 antenna is tuned for L5 frequency signals, allowing each component to have specialized properties that maximize its performance without affecting the other
2Measurement precision
If temperature stabilization is implemented during GNSS acquisition, then timing accuracy is improved, but device complexity increases
Solution Approach 1:
The patent implements preliminary thermal management actions before GNSS signal acquisition begins. The system proactively stabilizes the temperature of the crystal oscillator and identifies/controls thermal processes in advance, ensuring temperature stability is achieved before the critical acquisition phase starts, thereby improving timing accuracy without requiring complex real-time thermal control during acquisition
Solution Approach 2:
The system uses self-service by monitoring its own thermal state and automatically adjusting thermal management processes. The mobile device tracks its own temperature fluctuations and activates thermal control mechanisms when needed, enabling the system to maintain timing accuracy through self-regulation rather than requiring external complex control systems
Data Source
AI summary
In some implementations, the disclosed techniques may include tuning a first antenna element to a first tuning state during an acquisition mode for establishing communication channels with satellites. The first tuning state can configure the first antenna element to receive signals in a first frequency range. The techniques may include establishing the communication channels using the first antenna element in the first tuning state during the acquisition mode. The techniques may include transitioning from the acquisition mode to a tracking mode. The techniques may include changing the tuning state of the first antenna element. The techniques may include determining a location of the mobile device during the tracking mode: (1) using the first antenna element and a second antenna element of the mobile device or (2) not using the first antenna element and using the second antenna element that is configured to receive signals in a second frequency range.