Ranging Device Dual-Resolution Frequency Distribution Ambient Light
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Solution Overview
Problem
Existing ranging devices face challenges in accurately calculating ambient light information, which affects the accuracy of distance measurements, particularly when using multiple frequency distributions with different temporal resolutions.
Innovation Solution
A ranging device is designed with a time counting unit, pulse generation unit, decoder units, peak detection units, and ambient light information generation units to generate and process frequency distributions at varying resolutions, allowing for improved ambient light information calculation and reduced storage requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a method of calculating ambient light information from frequency distribution bins is applied in multi-resolution ranging, then the circuit area for storing frequency distribution can be reduced, but the accuracy of ambient light information may not be sufficiently obtained
Solution Approach 1:
The frequency distribution calculation is segmented into two resolutions: a first frequency distribution with lower temporal resolution for ambient light information, and a second frequency distribution with higher temporal resolution for distance measurement. This segmentation allows each distribution to serve its specific purpose optimally while managing circuit area constraints.
Solution Approach 2:
Different parts of the frequency distribution are assigned different qualities (resolutions). The first frequency distribution uses coarser bins suitable for ambient light characterization, while the second uses finer bins for precise distance measurement. This local differentiation of quality optimizes both accuracy and resource usage.
2Area of stationary object
If a second temporal resolution higher than the first temporal resolution is used, then the circuit area for storing the frequency distribution can be reduced, but the accuracy of ambient light information calculation deteriorates
Solution Approach 1:
The system dynamically selects which frequency distribution to use based on the information needed: the first frequency distribution is used for ambient light information calculation, while the second is used for distance measurement. This dynamic selection optimizes both circuit area usage and measurement accuracy for each specific task.
Solution Approach 2:
The temporal resolution parameter is changed between the two frequency distributions. The first distribution uses a lower temporal resolution (coarser bins) to reduce circuit area, while the second uses a higher temporal resolution (finer bins) for accurate distance measurement. This parameter differentiation resolves the contradiction between area and accuracy.
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
The device enhances the accuracy of ambient light information calculation and reduces storage needs by using a combination of low and high resolution frequency distributions, improving the overall reliability of distance measurements.
Implementation Method 1
a pulse generation unit configured to generate a signal including a pulse based on incident light
Data Source
AI summary
A ranging device includes: a pulse generation unit configured to generate a signal including a pulse based on incident light; a first decoder unit configured to generate a first frequency distribution having a first class width based on the time count value and the number of pulses; a second decoder unit configured to generate a second frequency distribution having a second class width narrower than the first class width based on the time count value and the number of pulses; a first ambient light information generation unit configured to generate first ambient light information based on the first frequency distribution; and a distance calculation unit configured to calculate distance information based on the second frequency distribution.