Ranging Device Using Segmented Pulse Sets for Dynamic Distance Measurement
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Solution Overview
Problem
Existing ranging devices face challenges in accurately measuring distances due to erroneous calculations caused by changes in object position and limited ranging range, leading to incorrect association of reference and reflected pulses.
Innovation Solution
A ranging device that projects a reference pulse set row with multiple sub-pulses and varying pulse intervals, allowing for accurate identification and calculation of distance based on delay time differences between projected and reflected pulses, enabling higher accuracy and increased repetition frequency without distance limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single reference pulse is projected for distance measurement, then the device structure is simple, but the measurement accuracy is low due to erroneous calculation when object position changes
Solution Approach 1:
The reference pulse is segmented into multiple sub-pulses (first sub-pulse, second sub-pulse, third sub-pulse) with different pulse intervals. Each sub-pulse serves as an independent reference for distance measurement, allowing the system to select the most appropriate sub-pulse based on object position, thereby improving measurement accuracy without requiring multiple separate transmitting units.
Solution Approach 2:
The pulse intervals between sub-pulses are dynamically adjusted based on object distance. The first pulse interval is set shorter for nearby objects, while the second and third pulse intervals are progressively longer for distant objects. This dynamic adjustment allows the system to adapt to varying object positions and maintain high measurement accuracy across different ranges.
2Productivity
If the pulse repetition frequency is increased to improve measurement speed, then productivity increases, but the ranging range is limited due to pulse overlap
Solution Approach 1:
The reference pulse is divided into multiple sub-pulses with different pulse intervals. This segmentation allows the system to handle multiple distance ranges simultaneously within a single repetition cycle, effectively extending the maximum ranging distance while maintaining high repetition frequency and preventing pulse overlap errors.
Solution Approach 2:
The system employs periodic transmission of pulse sets with varying pulse intervals. By periodically alternating between different pulse interval configurations (first, second, and third pulse intervals), the system can maintain high repetition frequency while ensuring that reflected pulses from different distance ranges do not overlap, thus extending the effective ranging range.
3Measurement precision
If multiple reference pulse set rows with different pulse intervals are projected, then the measurement accuracy across large dynamic range is improved, but the device complexity increases
Solution Approach 1:
The pulse intervals are dynamically configured based on object distance: the first pulse interval for nearby objects, the second pulse interval for intermediate distances, and the third pulse interval for distant objects. This dynamic configuration allows a single transmitting unit to handle multiple distance ranges effectively, reducing the need for separate systems while maintaining high measurement accuracy.
Solution Approach 2:
The identifying unit compares the reflected pulse set with stored reference pulse set rows to identify the matching reference pulse. This feedback mechanism allows the system to automatically select the appropriate reference pulse based on the actual object distance, thereby managing signal processing complexity through intelligent pattern recognition rather than requiring complex hardware for each distance range.
4Measurement precision
If a fixed pulse interval is used for ranging, then the device operation is simple, but the measurement accuracy deteriorates when object position changes during measurement
Solution Approach 1:
The reference pulse is segmented into multiple sub-pulses with different pulse intervals. This segmentation provides the system with multiple reference options without complicating the basic transmission mechanism. The identifying unit simply needs to match the reflected pulse pattern against stored references, maintaining operational simplicity while improving accuracy for moving objects.
Solution Approach 2:
The system dynamically selects which pulse interval to use based on object distance and movement. By having pre-configured pulse intervals (first, second, third) with different durations, the system can adapt to object position changes during measurement without requiring complex real-time control adjustments, thus maintaining ease of operation while improving measurement 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
This solution enables more accurate distance measurement and increased repetition frequency, reducing errors and allowing for high-density, high-accuracy two-dimensional ranging across a large dynamic range without the need for separate systems based on distance.
Implementation Method 1
a light projecting unit for projecting a reference pulse set row including a main pulse and at least one sub pulse
Implementation Method 2
a light receiving unit for receiving a reflected pulse set row obtained by reflection of the reference pulse set row by an object to be measured
Implementation Method 3
a calculating unit for calculating a distance to the object to be measured on the basis of a delay time difference between the reference pulse set row and the reflected pulse set row corresponding to the reference pulse set row
Data Source
AI summary
A ranging device provided with a light projecting unit for projecting a reference pulse set row including a main pulse and at least one sub pulse, a light receiving unit for receiving a reflected pulse set row obtained by reflection of the reference pulse set row by an object to be measured, and an identifying unit for identifying the reflected pulse set row corresponding to the reference pulse set row. The ranging device is further provided with a calculating unit for calculating a distance to the object to be measured on the basis of a delay time difference between the reference pulse set row and the reflected pulse set row corresponding to the reference pulse set row. The light projecting unit projects a plurality of reference pulse set rows having different pulse intervals.