Laser Radar Timing Coordination for False Detection Reduction
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Solution Overview
Problem
When multiple laser radar devices are used for monitoring surroundings, they can erroneously detect objects due to reflected light from other devices, leading to false detections.
Innovation Solution
The laser radar devices are configured to emit pulses such that adjacent devices scan overlap regions at matching timings, allowing the control device to accurately detect objects by comparing results from adjacent sensors and distinguishing actual objects from false detections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple laser radar devices are used to monitor surroundings, then the coverage area is improved, but erroneous detections increase due to reflected light from other devices
Solution Approach 1:
The patent applies periodic action by controlling laser radar devices to emit laser beams in alternating periods rather than continuously. Each device has designated light-emitting periods and off periods, creating a time-division multiplexed scanning pattern. This periodic emission scheme allows multiple devices to share the same spatial coverage without simultaneous interference, resolving the contradiction between expanded coverage and detection accuracy.
Solution Approach 2:
The patent implements preliminary action by pre-configuring the control unit with timing information about when each laser radar device should emit and when it should be off. The control unit determines light-emitting timings in advance based on device positions and scanning patterns, ensuring that devices operate in coordinated periods before any erroneous detection can occur. This preliminary timing coordination prevents reflected light interference while maintaining comprehensive coverage.
2Speed
If laser radar devices operate continuously, then detection speed is improved, but interference from reflected light between devices increases
Solution Approach 1:
The patent converts continuous operation into periodic pulsed operation, where each laser radar device emits laser beams in discrete light-emitting periods separated by off periods. This periodic action maintains high detection speed by ensuring that at least one device is actively scanning at any given moment, while simultaneously preventing reflected light interference by ensuring no two devices emit simultaneously in overlapping regions.
Solution Approach 2:
The patent maintains continuity of useful action by coordinating the periodic operation of multiple laser radar devices so that while one device is in its off period, another device is in its light-emitting period. This ensures that the monitoring coverage remains continuous without gaps, preserving detection speed and effectiveness while avoiding interference through temporal separation of emissions.
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 configuration reduces erroneous detections and enhances the accuracy of object detection, minimizing blind spots around vehicles or buildings, thereby providing a safer monitoring system.
Implementation Method 1
a laser radar device Mi that measures positional information regarding an object by scanning a scan range while emitting pulses of laser light and receiving reflected light
Data Source
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AI summary
An object detection apparatus includes: a first measurement unit configured to measure first positional information regarding a first object existing in a first scan range on the basis of first reflected wave of first wave radiated onto the first scan range including a first region; a second measurement unit configured to measure second positional information regarding a second object existing in a second scan range on the basis of second reflected wave of second wave radiated onto the second scan range including the first region and a second region, which is located outside the first scan range, the second wave being radiated in such a way as to scan the first region in a direction opposite a direction in which the first measurement unit radiates the first wave at a timing at which the first measurement unit scans the first region; and a detection unit configured to detect a third object existing in the first region on the basis of the first positional information obtained from the first measurement unit and the second positional information obtained from the second measurement unit.