Ranging Device Dynamic Resolution Switching
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Solution Overview
Problem
Existing ranging devices face a trade-off between reducing storage capacity and maintaining high ranging accuracy, as increasing the storage capacity to accommodate multiple frequency distributions with different temporal resolutions can compromise accuracy.
Innovation Solution
A ranging device that dynamically switches between different temporal resolutions for frequency distribution acquisition based on peak detection information, allowing for selective generation of frequency distributions with varying time intervals, thereby optimizing storage capacity while maintaining high accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple frequency distributions with different temporal resolutions are stored to maintain high ranging accuracy, then ranging precision is improved, but storage capacity increases
Solution Approach 1:
The patent applies dynamics by making the temporal resolution of frequency distribution acquisition changeable based on detection results. The system dynamically switches between first temporal resolution (for initial peak detection) and second temporal resolution (for refined peak detection), allowing the storage requirements to adapt to actual ranging needs rather than maintaining fixed high-resolution storage for all cases
Solution Approach 2:
The patent applies local quality by using different temporal resolutions for different portions of the frequency distribution acquisition process. The first frequency distribution uses a first temporal resolution for broad peak location identification, while the second frequency distribution uses a second temporal resolution (higher than the first) for precise peak measurement only in the relevant time range, optimizing storage efficiency while maintaining accuracy where needed
2Quantity of substance
If the second temporal resolution is set higher than the first temporal resolution to reduce circuit area, then storage capacity is reduced, but ranging accuracy may deteriorate
Solution Approach 1:
The patent applies preliminary action by first acquiring a frequency distribution at the first temporal resolution to identify the rough peak location. Based on this preliminary detection, the system then determines the appropriate second temporal resolution and acquires a refined frequency distribution only in the relevant time range, ensuring high accuracy is maintained where needed while reducing overall storage requirements
Solution Approach 2:
The patent applies parameter changes by adjusting the temporal resolution parameter based on the detection stage and peak location. The system changes from using the first temporal resolution for initial detection to using the second temporal resolution (higher than the first) for refined measurement, optimizing the balance between storage capacity and ranging accuracy through parameter adaptation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces storage capacity requirements while preventing a decrease in ranging accuracy, even when peaks occur near resolution boundaries, enabling both efficient storage and precise distance measurement.
Implementation Method 1
a pulse generation unit configured to generate a signal including a pulse based on light including reflected light from an object
Data Source
AI summary
A ranging device selectively generates, for each frame period, either a first frequency distribution generated at a first time interval or a second frequency distribution generated at a second time interval shorter than the first time interval, determines a second parameter used for acquiring the second frequency distribution based on first time information indicating a time corresponding to a peak of the number of pulses in the first frequency distribution, and determines a first parameter used for acquiring the first frequency distribution based on second time information indicating a time corresponding to a peak of the number of pulses in the second frequency distribution.