LIDAR Multipulse Signal Segmentation for Noise Distinguishability
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Solution Overview
Problem
Current LIDAR systems face challenges in distinguishing multipulse signals from noise and achieving high spatial resolution in monitoring surroundings, particularly due to limitations in signal identification and resolution.
Innovation Solution
The method involves generating and emitting multipulse signals with temporally separate peaks and superimposed peak flanks, using semiconductor lasers, and controlling light sources to produce double pulse signals with specific peak widths and temporal spacing, enhancing signal distinguishability and spatial resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single pulse signals are used for illuminating the visual field, then the device complexity is low, but the signal identification from noise and spatial resolution deteriorate
Solution Approach 1:
The single pulse signal is segmented into multiple temporally separated peaks within a multipulse signal structure. Each peak can be independently analyzed, allowing the receiver to distinguish multiple return signals corresponding to different distance ranges, thereby improving signal identification from noise while maintaining a relatively simple device architecture
Solution Approach 2:
The transmitter emits periodic multipulse signals with specific temporal spacing between peaks. This periodic structure creates distinct time windows for receiving reflected signals from different distance ranges, enabling the system to differentiate between signals from various spatial positions and improve measurement precision without significantly increasing device complexity
2Measurement precision
If multipulse signals with multiple peaks are used, then spatial resolution improves, but the difficulty of detecting and measuring increases
Solution Approach 1:
The system transitions from analyzing single-pulse temporal profiles to analyzing the temporal sequence of multiple peaks. By adding the dimension of peak sequence analysis, the receiver can distinguish signals from different distance ranges based on their temporal ordering, improving spatial resolution while providing a systematic method for detecting and measuring multiple objects
3Reliability
If multipulse signals with temporally superimposed peak flanks are used, then signal distinguishability from noise improves, but the device complexity increases
Solution Approach 1:
The transmitter is designed to generate multipulse signals with predetermined temporal spacing and superimposed peak flanks before emission. This preliminary structuring of the signal ensures that reflected signals from different distance ranges arrive at the receiver with distinct temporal patterns, improving signal distinguishability from noise while avoiding the need for complex real-time signal processing
Solution Approach 2:
The receiver analyzes the temporal pattern of received signals, including the superimposed peak flanks, and uses this information to distinguish valid reflected signals from background noise. The system correlates the received signal patterns with the transmitted multipulse structure, providing feedback-based noise rejection and improving reliability
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 significantly improves signal identification from noise and spatial resolution by using multipulse signals with controlled peak widths and temporal spacing, allowing for better detection and evaluation of visual field data.
Implementation Method 1
an optical multipulse signal with multiple, in particular temporally separate, peaks and temporally superimposed peak flanks of temporally directly succeeding peaks is generated on the transmitter side
Data Source
AI summary
An operating method for a LIDAR system. An optical multipulse signal with multiple temporally separate peaks and temporally superimposed peak flanks of temporally directly succeeding peaks is generated on the transmitter side, and is emitted into a visual field as an optical transmission signal. A corresponding control unit, a LIDAR system, and a working device, in particular a vehicle, are also described.