LiDAR Frame Synchronization Control for Timestamp Jump Compensation
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Solution Overview
Problem
Timestamp jumps in LiDAR systems due to variations in clock crystal oscillator precision degrade frame synchronization and measurement accuracy, particularly affecting systems without mechanical components like solid-state array LiDARs.
Innovation Solution
A frame synchronization control method that updates the frame start timestamp upon detecting a jump, recalculates the next frame's timestamp based on the adjusted current frame timestamp, and triggers a synchronization pulse signal to align frame starts, incorporating a receiving chip with modules for timestamp detection, calculation, and pulse generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic clock calibration is performed via gPTP to align system time with real-time, then clock synchronization is improved, but timestamp jumps occur which degrade frame synchronization and measurement accuracy
Solution Approach 1:
The patent performs preliminary detection of timestamp jumps before they affect frame synchronization. By monitoring timestamp continuity and detecting jumps in advance, the system can prepare compensation measures (adjusting frame start timestamps) before the jumps degrade measurement accuracy, thus resolving the contradiction between maintaining clock synchronization and preserving frame synchronization accuracy
2Adaptability or versatility
If timestamp jumps are allowed to occur during clock calibration, then clock synchronization flexibility is improved, but frame synchronization results are compromised
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors timestamp values and detects jumps. When a jump is detected, the system provides feedback by adjusting the frame start timestamp compensation values, which then feeds back into the frame synchronization process. This closed-loop feedback allows the system to adapt to clock calibration flexibility while maintaining frame synchronization accuracy through automatic compensation
3Measurement precision
If frame start timestamp is updated based on timestamp jump detection, then frame synchronization accuracy is improved, but system complexity increases
Solution Approach 1:
The receiving chip performs self-service by autonomously detecting timestamp jumps and automatically compensating for them through frame start timestamp adjustments. The system uses its own timestamp resources to detect jumps and generates compensation values without requiring external intervention. This self-service approach improves frame synchronization accuracy while minimizing system complexity by eliminating the need for complex external synchronization controllers
Data Source
AI summary
A frame synchronization control method, a receiving chip, a terminal device, and a storage medium are provided. The frame synchronization control method includes: upon detecting a timestamp jump based on an input clock signal, updating a frame start timestamp of a current frame according to the timestamp jump value; determining a frame start timestamp of a next frame based on the updated frame start timestamp of the current frame and a frame interval; outputting a frame synchronization pulse signal when a timestamp reaches the frame start timestamp of the next frame, where the frame synchronization pulse signal is configured to trigger a LiDAR system to perform a next frame scan.