Scanning LiDAR Error Correction via TDC Feedback
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Solution Overview
Problem
Scanning LiDAR systems experience distortion in measurement results due to errors in measurement time intervals, caused by excessive timer interrupt tasks or decreased semiconductor operation speed, leading to inaccurate location information.
Innovation Solution
A method using a Time to Digital Converter (TDC) to determine and correct measurement time interval errors in scanning LiDAR systems, which involves setting initial and designated laser light emission time points, calculating error ratios, and applying correction algorithms to adjust laser light emission angles and time intervals to prevent distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser light is emitted at very short time intervals to accurately determine object location, then measurement precision is improved, but timing errors occur due to excessive interrupt tasks or decreased semiconductor operation speed
Solution Approach 1:
The patent implements a feedback mechanism where the actual time interval measurement value is continuously compared with the expected time interval value, and correction values are generated based on the detected errors to adjust subsequent measurements, thereby resolving the contradiction between short measurement intervals and timing reliability
Solution Approach 2:
The patent changes the parameter of time interval emission by dynamically adjusting the emission timing based on detected errors. The system modifies the actual time interval parameters to compensate for timing errors, allowing short intervals to be maintained while correcting for reliability issues through parameter adaptation
2Productivity
If timer interrupt tasks are increased to improve measurement frequency, then productivity is improved, but distortion is generated in location information due to excessive interrupt overhead
Solution Approach 1:
The patent converts the harmful effect of excessive interrupt tasks into a beneficial correction mechanism. By detecting the timing errors caused by interrupt overhead and using these error patterns to generate correction values, the system transforms the harm of high-frequency interrupts into a means to improve overall measurement accuracy through error compensation
3Use of energy by moving object
If semiconductor operation speed is decreased to reduce power consumption, then energy efficiency is improved, but time interval measurement accuracy deteriorates
Solution Approach 1:
The patent uses feedback to monitor actual time interval measurements and compare them with expected values, generating correction values that compensate for timing errors caused by reduced semiconductor operation speed, thereby maintaining measurement precision while operating at lower power consumption levels
Data Source
AI summary
A method of correcting an error of a scanning LiDAR, may include: an initial value setting operation of designating an initial emission time point among a plurality of laser light emission time points of the scanning LiDAR; a designated value increasing operation of designating a laser light emission time point after the initial emission time point among the plurality of laser light emission time points; an error determining operation of determining whether an error is generated in the measurement time interval by applying the designated laser light emission time point to a pre-prepared error algorithm; and an error correcting operation of correcting the error of the measurement time interval by use of a pre-prepared correcting algorithm when it is determined that the error is generated in the measurement time interval.