Time synchronization method and apparatus for vehicle-mounted device, vehicle-mounted device, and storage medium
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Solution Overview
Problem
Signal time synchronization issues between vehicle-mounted devices in intelligent driving systems lead to positioning errors, affecting the safety of autonomous driving.
Innovation Solution
A time synchronization method involving coarse time alignment and Kalman filter-based error correction is employed to synchronize vehicle-mounted devices, utilizing communication data generation and receiving times to calculate synchronization times without requiring hardware changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hardware-based time synchronization is implemented, then synchronization accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces hardware-based time synchronization mechanisms with a software-based solution using Kalman filter algorithms. The method uses communication data timestamps and computational filtering to achieve time synchronization without additional hardware components, thereby substituting mechanical/physical systems with information-processing systems.
Solution Approach 2:
The patent changes the approach from fixed hardware timing to dynamic software-based time calculation. By using Kalman filter to continuously estimate and adjust synchronization parameters based on communication data, the system adapts time synchronization to actual transmission conditions rather than relying on predetermined hardware timing.
2Measurement precision
If hardware-based time synchronization is implemented, then synchronization accuracy is improved, but implementation cost increases
Solution Approach 1:
The patent replaces expensive hardware time synchronization components with software-based Kalman filter processing. This substitution eliminates the need for additional hardware infrastructure while achieving comparable or superior synchronization accuracy through algorithmic computation.
Solution Approach 2:
The patent uses readily available communication data timestamps that are already generated during normal device operation. Instead of requiring expensive dedicated synchronization hardware, the system repurposes existing communication protocols and data structures for time synchronization purposes.
3Stability of the object's composition
If coarse time alignment is performed first, then synchronization stability is improved, but total synchronization time increases
Solution Approach 1:
The patent performs coarse time alignment as a preliminary step before applying Kalman filter refinement. This preliminary action establishes a stable baseline synchronization state, which then allows the more sophisticated Kalman filter to focus on fine-tuning rather than working from scratch, ultimately reducing total processing time.
Solution Approach 2:
The patent divides the time synchronization process into two distinct stages: coarse time alignment and Kalman filter-based fine synchronization. This segmentation allows each stage to optimize for its specific function, with coarse alignment providing quick initial synchronization and the filter providing precise long-term stability.
Data Source
AI summary
Disclosed are a time synchronization method and an apparatus for a vehicle-mounted device, a vehicle-mounted device, and a storage medium. The time synchronization method including: receiving first communication data transmitted by the second vehicle-mounted device, and recording a first receiving time; performing coarse time alignment on the first vehicle-mounted device based on the data generation time in the first communication data; after coarse time alignment is performed on the first vehicle-mounted device, receiving second communication data transmitted by the second vehicle-mounted device, and recording a second receiving time; determining, based on the first receiving time, the second receiving time, and the data transmitting time, a synchronization time at which the first vehicle-mounted device and the second vehicle-mounted device are synchronized; performing time synchronization on the first vehicle-mounted device based on the synchronization time.