Ranging System Crosstalk Reduction via Wavelength Segmentation
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Solution Overview
Problem
Crosstalk between multiple LIDAR ranging apparatuses mounted on mobile platforms, such as cars or UAVs, leads to noise interference in measurement results due to optical signals being received by unintended devices, affecting the accuracy of obstacle detection and navigation.
Innovation Solution
Implementing a ranging system where at least two ranging apparatuses emit laser pulse sequences with different time sequences or random repetition frequencies, or use distinct wavelengths to differentiate and reduce crosstalk, allowing for effective filtering and elimination of noise points through algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple ranging apparatuses are mounted on mobile platforms for navigation and obstacle detection, then the coverage and detection capability are improved, but crosstalk noise is generated among the apparatuses affecting measurement precision
Solution Approach 1:
The patent divides the optical signal space by assigning different wavelengths to different ranging apparatuses. Each apparatus operates at a distinct wavelength, effectively segmenting the shared optical environment and preventing crosstalk interference while maintaining comprehensive detection coverage
Solution Approach 2:
Optical filters are introduced as intermediary components in the detection path of each ranging apparatus. These filters selectively transmit only the intended wavelength while blocking other wavelengths, acting as mediators that eliminate crosstalk noise from other apparatuses and preserve measurement precision
2Measurement precision
If laser pulse sequences are emitted with longer flight time to reduce crosstalk probability, then the energy scattering is reduced and signal quality is improved, but the time required for ranging increases
Solution Approach 1:
The patent changes the wavelength parameter of the laser pulses emitted by different ranging apparatuses. By operating at different wavelengths, the system allows simultaneous emission of multiple pulse sequences without crosstalk, eliminating the need to extend flight time for noise reduction while maintaining high signal quality and rapid ranging
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 the probability of crosstalk noise by increasing the flight time of laser pulses, scattering energy, and using optical filters to isolate signals, thereby enhancing the accuracy of object detection and navigation systems.
Implementation Method 1
Each of the plurality of ranging apparatuses is configured to emit a laser pulse sequence, receive a laser pulse sequence reflected by an object, and detect the object according to the laser pulse sequence emitted and the laser pulse sequence received
Implementation Method 2
A LIDAR plays an important role in a plurality of fields, for example, the LIDAR can be applied to a mobile platform or a non-mobile platform for remote sensing, obstacle avoidance, surveying and mapping, modeling, etc
Implementation Method 3
using optical filters to isolate signals
Data Source
AI summary
A ranging system includes a plurality of ranging apparatuses. Each of the plurality of ranging apparatuses is configured to emit a laser pulse sequence, receive a laser pulse sequence reflected by an object, and detect the object according to the laser pulse sequence emitted and the laser pulse sequence received. The two or more ranging apparatuses of the plurality of ranging apparatuses are configured to emit laser pulse sequence with different time sequences and/or to emit different laser pulse sequences.