LiDAR Laser Receiver Isolation for Crosstalk Reduction
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Solution Overview
Problem
In multi-line LiDAR systems, the decreasing volume and densely arranged sensor arrays lead to a low signal-to-noise ratio due to increased noise crosstalk between signal receiving channels, affecting detection accuracy.
Innovation Solution
A laser receiving device is designed with independent current loops for each parallel receiving channel, achieved through electromagnetic shielding between adjacent sensor and amplifier groups, and a shared ground plane to reduce noise crosstalk and improve signal processing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the LiDAR volume is decreased and sensor arrays are densely arranged, then the compactness of the device is improved, but the signal-to-noise ratio deteriorates due to increased noise crosstalk between channels
Solution Approach 1:
The sensor array is divided into multiple independent sensor groups, each with its own dedicated amplifier group and power supply unit. This segmentation creates independent current loops for each receiving channel, preventing noise crosstalk between channels while maintaining compact arrangement. Each segment operates independently with isolated power supply and signal processing paths.
Solution Approach 2:
Different regions of the device are assigned different functions with localized optimization. Sensor groups are positioned to receive specific laser lines, amplifier groups are locally coupled to their corresponding sensors, and power supply units are distributed to specific groups. This local quality approach ensures that each channel has dedicated resources while maintaining overall system compactness.
2Device complexity
If multiple sensor groups are arranged on the same sensor plate, then the device complexity is reduced, but the noise crosstalk between adjacent channels increases
Solution Approach 1:
The sensor plate is segmented into multiple independent regions, each containing a sensor group with its own amplifier group. The isolation components create electrical and electromagnetic boundaries between these segments, allowing multiple sensor groups to coexist on the same plate without significant noise crosstalk. This segmentation maintains structural simplicity while preventing interference.
Solution Approach 2:
Isolation components are introduced as intermediary elements between adjacent sensor groups and amplifier groups on the same plate. These isolation components act as electromagnetic shields and electrical isolators, blocking noise crosstalk while allowing the sensor groups to remain closely arranged on the same substrate, thus reducing overall device complexity.
3Length of stationary object
If adjacent sensor groups and amplifier groups are arranged on the same plate, then the connection length is reduced, but the electromagnetic interference between groups increases
Solution Approach 1:
Isolation components are placed between adjacent sensor groups and amplifier groups on the same plate, serving as electromagnetic shields. These intermediaries block electromagnetic fields from coupling between neighboring groups, allowing short connection lengths while preventing electromagnetic interference. The isolation components are strategically positioned at critical coupling points.
Solution Approach 2:
The electromagnetic shielding properties are applied locally at specific positions where sensor groups and amplifier groups are adjacent. Rather than shielding the entire plate, isolation components are selectively placed only where interference is most likely to occur, maintaining short connection lengths while providing targeted electromagnetic interference protection.
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 solution effectively reduces noise crosstalk, enhances the signal-to-noise ratio, and improves the accuracy of laser detection by isolating each signal receiving channel, allowing for a more compact and efficient LiDAR design.
Implementation Method 1
a first isolation part for electromagnetic shielding is arranged between the two adjacent sensor groups... a second isolation part for electromagnetic shielding is provided between the two adjacent amplifier groups
Data Source
AI summary
The present disclosure relates to a laser receiving device and a LiDAR. An isolation component is provided between a plurality of parallel sensor groups, and an isolation component is provided between a plurality of amplifier groups in parallel, so that a plurality of parallel receiving channels each form an independent current loop, thereby reducing noise crosstalk among signal receiving channels and improving the signal-to-noise ratio of the laser receiving device.