Ranging Device Dynamic Frame Period for Response Speed
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Solution Overview
Problem
Existing ranging devices face challenges in achieving high responsiveness for quick distance measurement results, particularly in applications like collision avoidance, where sudden changes in obstacles or vehicle speed require immediate distance measurement. Current techniques either compromise on accuracy or increase power consumption, or result in delayed measurement due to altered output frequencies or extended measurement periods.
Innovation Solution
A ranging device that includes a light receiving unit, a frequency distribution generation unit, a control unit, and a distance measurement result calculation unit, which generates a frequency distribution of distance data and determines a distance range based on a threshold value, allowing for immediate output of distance measurement results when the frequency exceeds a predetermined threshold, thereby ending the frame period prematurely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measurement period is extended to improve measurement accuracy, then measurement precision is improved, but responsiveness deteriorates
Solution Approach 1:
The patent applies dynamics by making the frame period adjustable rather than fixed. The control unit dynamically shortens the frame period when distance measurement results need to be output quickly, allowing the system to adapt between measurement accuracy and responsiveness based on real-time needs. This resolves the contradiction by enabling the system to switch between long frame periods for accuracy and short frame periods for speed.
Solution Approach 2:
The patent changes the parameter of frame period duration based on measurement requirements. By modifying this key parameter dynamically, the system can optimize between measurement precision (longer frame period) and responsiveness (shorter frame period), directly addressing the technical contradiction without requiring multiple hardware configurations.
2Speed
If the output frequency is increased to improve responsiveness, then responsiveness is improved, but measurement precision deteriorates
Solution Approach 1:
The system dynamically adjusts the frame period based on whether quick response is needed. When responsiveness is prioritized, the control unit shortens the frame period, allowing more frequent outputs. When measurement precision is prioritized, the frame period is extended. This dynamic adjustment resolves the contradiction between output frequency and measurement quality.
3Speed
If the measurement period is shortened to improve responsiveness, then responsiveness is improved, but measurement precision deteriorates
Solution Approach 1:
The patent implements a dynamic frame period mechanism that can shorten the measurement period when responsiveness is critical. The control unit monitors measurement needs and adjusts the frame period accordingly, allowing the system to accept reduced precision in exchange for improved response speed when necessary, while maintaining high precision when time is not constrained.
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 solution enables a high-response ranging device capable of quickly outputting distance measurement results according to state changes in the measurement region, improving responsiveness without compromising accuracy or increasing power consumption.
Implementation Method 1
a light receiving unit including a light receiving element, a frequency distribution generation unit configured to generate a frequency distribution indicating a relationship between a distance and a frequency based on a timing at which light irradiated to an object is detected by the light receiving element
Data Source
AI summary
A ranging device includes a light receiving unit, a frequency distribution generation unit that generates a frequency distribution based on a timing at which light irradiated to an object is detected, a control unit that controls a frame period for counting of distance data, and a distance measurement result calculation unit that calculates a distance measurement result based on the frequency distribution. The distance measurement result calculation unit periodically acquires the frequency distribution during a predetermined period set as a frame period. When the frequency of any of the classes in the acquired frequency distribution exceeds a threshold value, the distance measurement result calculation unit determines a distance range of the class in which the frequency exceeds the threshold value as a distance measurement result, and the control unit outputs the distance measurement result before the predetermined period of time to end the frame period.