FMCW LiDAR Scanning Modes for Resolution and Long-Range Detection
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Solution Overview
Problem
FMCW LiDARs face challenges in maintaining resolution and long-distance measurement capability due to the decrease in detection points for distant targets and reduced signal-to-noise ratio with increased scanning speed, leading to poor target classification and recognition.
Innovation Solution
The FMCW LiDAR employs a transceiver device with multiple ports, a beam shaper, a scanner device, and a controller to switch between scanning modes with varying rotation speeds and swing amplitudes, allowing for adjustable FOV and improved detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the scanning speed of the scanning mirror is increased to increase the FOV, then the FOV is improved, but the long-distance measurement capability is reduced
Solution Approach 1:
The patent implements multiple scanning modes with different rotation speeds and swing amplitudes that can be dynamically switched based on detection requirements. The controller device adjusts the scanning mirror's operational parameters in real-time, allowing the system to adapt between wide FOV scanning and high-precision long-distance measurement modes, resolving the contradiction between FOV size and measurement capability.
2Speed
If the scanning speed is increased, then the FOV is improved, but the signal-to-noise ratio is reduced
Solution Approach 1:
The system dynamically adjusts the scanning mirror's rotation speed based on the required FOV and detection conditions. When high signal-to-noise ratio is needed for long-distance targets, the system switches to lower rotation speeds, allowing sufficient time for echo light to return while maintaining acceptable scanning efficiency.
3Productivity
If the scanning mirror rotates faster, then the FOV coverage is improved, but the delay angle increases
Solution Approach 1:
The controller device dynamically adjusts the swing amplitude and rotation speed of the scanning mirror based on the required FOV coverage. By optimizing these parameters in real-time, the system achieves efficient FOV coverage while minimizing the delay angle between transmitted and received light beams, thereby maintaining measurement precision.
4Productivity
If the rotation speed is increased, then the scanning efficiency is improved, but the detection resolution is reduced
Solution Approach 1:
The patent implements multiple scanning modes with different rotation speeds that can be switched based on detection requirements. For distant targets requiring high resolution, the system uses lower rotation speeds to maintain detection quality. For closer targets or when rapid scanning is needed, higher rotation speeds are employed to improve scanning efficiency.
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 detection resolution and long-distance measurement capabilities by optimizing scanning modes based on detection requirements, reducing complexity in controlling the light source and transceiver device.
Implementation Method 1
The beam shaper device is configured to collimate the detection light and converge the echo light onto the transceiver device
Implementation Method 2
The beam shaper device is configured to collimate the detection light and converge the echo light onto the transceiver device
Implementation Method 3
The scanner device is configured to rotate around at least one axis to reflect the detection light from the beam shaper device to a target space, and reflect the echo light to the beam shaper device
Data Source
AI summary
An FMCW LiDAR includes a transceiver, a beam shaper, a scanner, and a controller. The transceiver includes multiple ports arranged at least along a first direction. The transceiver is configured to transmit a detection light at a predetermined time sequence and receive an echo light of the detection light being reflected off an object. The beam shaper is configured to collimate the detection light and converge the echo light onto the transceiver. The scanner is configured to be rotate around an axis to reflect the detection light from the beam shaper to a target space, and reflect the echo light to the beam shaper. The controller electrically connected to the scanner, and configured to control the scanner to switch between multiple scanning modes. The scanner has different rotation speeds and/or swing amplitudes in different scanning modes. The adjacent-time ports transmit the detection light at a same predetermined time interval.