Dual-Scanner LIDAR Angle Modulation for Range Precision
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Solution Overview
Problem
LIDAR systems face challenges in accurately determining the range and velocity of objects due to positional changes between the transmission and reception of laser beams, particularly in applications like autonomous trucking where long-range detection is required, leading to difficulties in signal processing and noise interference.
Innovation Solution
The implementation of a LIDAR system using at least two scanning devices to control the angle of the transmitted beam, approximating a step function over time, to better relate the transmitted and return beams, thereby improving signal-to-noise ratio, maximum range, and effective duty cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single scanner is used in the LIDAR system, then the device complexity is low, but the measurement precision of object range and velocity deteriorates due to positional changes between transmission and reception
Solution Approach 1:
The scanning function is divided into two independent scanners: a first scanner that modulates the transmitted beam angle and a second scanner that modulates the received beam angle. This segmentation allows each scanner to independently control angular positions, enabling precise tracking of object position changes between transmission and reception without requiring a single complex scanning mechanism.
Solution Approach 2:
The system introduces a temporal dimension to the scanning process by applying angle modulation over time. The first scanner modulates the transmitted beam angle as a function of time, and the second scanner applies corresponding angle modulation to the received beam, creating a time-correlated angular relationship that compensates for object motion during the measurement interval.
2Length of stationary object
If the LIDAR system uses long-range detection capability, then the detection range is improved, but noise interference increases making signal processing difficult
Solution Approach 1:
The system uses feedback through correlated angle modulation between transmission and reception. The second scanner applies angle modulation that corresponds to the first scanner's modulation pattern, creating a feedback mechanism that enhances the signal-to-noise ratio by selectively amplifying returns from the intended spatial-temporal window while rejecting noise from other directions and times.
Solution Approach 2:
The angle modulation applied by both scanners occurs periodically over time, creating a time-varying angular pattern that encodes the transmission signal. This periodic modulation allows the system to distinguish the desired signal from random noise through correlation detection, improving signal-to-noise ratio at long ranges.
3Measurement precision
If the LIDAR system applies angle modulation to track moving objects, then the velocity measurement capability is improved, but the device complexity increases
Solution Approach 1:
The system implements dynamic angle modulation where both scanners continuously adjust their beam angles as functions of time. The first scanner dynamically modulates the transmitted beam angle, and the second scanner dynamically modulates the received beam angle in correspondence, enabling real-time tracking of moving objects and extraction of velocity information from the angular position changes over time.
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 enhances the LIDAR system's ability to accurately determine object parameters, such as range and velocity, even at long ranges, and reduces noise interference, leading to improved safety and efficiency in autonomous vehicle operations.
Implementation Method 1
A light detection and ranging (LIDAR) system includes a laser source, a first scanner, and a second scanner. The first scanner receives a first beam from the laser source
Implementation Method 2
LIDAR provides finer scale range resolution with smaller beam sizes than conventional microwave ranging systems, such as radio-wave detection and ranging (RADAR)
Data Source
AI summary
A LIDAR system includes a laser source, a first scanner, and a second scanner. The first scanner receives a first beam from the laser source and applies a first angle modulation to the first beam to output a second beam at a first angle. The second scanner receives the second beam and applies a second angle modulation to the second beam to output a third beam at a second angle.