Multi-Antenna GNSS Motion Calculation with Shared Clock Synchronization
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Solution Overview
Problem
Existing movement information calculating devices experience varying estimation accuracy due to the number of GNSS signals receivable by each antenna, leading to reduced accuracy when some antennas have fewer signals.
Innovation Solution
A movement information calculating device utilizing a common clock signal for multiple GNSS receivers, allowing them to combine GNSS signals from different satellites, and employing an arithmetic logical unit to estimate movement information with high accuracy by integrating GNSS and IMU data using an extended Kalman filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple antennas are used to receive GNSS signals, then the system can calculate movement information, but the estimation accuracy varies when the number of receivable signals differs among antennas
Solution Approach 1:
The patent combines GNSS signals from multiple antennas with different signal counts into a unified processing system. The signal combining unit integrates signals from all antennas regardless of individual signal quality, allowing the system to utilize all available GNSS signals collectively rather than being limited by the antenna with the fewest signals.
Solution Approach 2:
The patent introduces a signal combining unit as an intermediary between the multiple antennas and the movement information calculation unit. This intermediary component processes and integrates signals from all antennas, mediating the difference in signal reception quality and enabling consistent processing of combined signals for accurate movement information estimation.
2Device complexity
If each antenna processes GNSS signals independently, then signal processing is simplified, but overall estimation accuracy decreases due to unequal signal availability
Solution Approach 1:
The patent merges the processing of GNSS signals from multiple antennas into a unified calculation process. Instead of independent processing, the signal combining unit aggregates signals from all antennas and feeds them to a single movement information calculation unit, improving accuracy while maintaining manageable system complexity.
Solution Approach 2:
The movement information calculation unit is designed to handle combined signals from multiple antennas with different signal counts. This universal processing capability allows the same calculation unit to process integrated signals regardless of the varying reception conditions of individual antennas, achieving both simplicity and accuracy.
3Adaptability or versatility
If a common clock signal is used for multiple GNSS receivers, then signal integration is enabled, but synchronization requirements increase
Solution Approach 1:
The patent merges the clock synchronization system by providing a common clock signal to all GNSS receivers. This unified timing source enables the integration of signals from multiple antennas and receivers, allowing coherent processing and accurate movement information calculation while simplifying the overall synchronization architecture.
Data Source
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AI summary
Movement information is calculated with high accuracy, without being influenced by the number of GNSS signals receivable by each of a plurality of antennas. A movement information calculating device 10 includes a plurality of antennas 21 and 22, a clock generator 30, a plurality of GNSS receivers 41 and 42, and an arithmetic logical unit 60. The plurality of antennas 21 and 22, each receives a GNSS signal. The clock generator 30 generates a clock signal. The plurality of GNSS receivers 41 and 42 are connected to the respective antennas 21 and 22, and share the clock signal from the clock generator 30 and calculate GNSS observed values by using the shared clock signal and the GNSS signals, respectively. The arithmetic logical unit 60 calculates movement information including a speed of a movable body based on the GNSS observed values from the plurality of GNSS receivers 41 and 42.