16 patents in this list

Updated: February 06, 2024

Explore patented methodologies designed to resolve interference challenges in LiDAR systems. This collection features inventive approaches for ensuring signal clarity and precision in LiDAR devices by addressing interference avoidance, crucial for optimal functionality in environments populated with multiple sensors.

1. Adaptive Filtering in LiDAR Systems for Enhanced Interference Mitigation


(Summary) LiDAR system with tunable filters to avoid interference from sunlight and other radiation sources. The system uses wavelength monitoring to track the laser's output wavelength and then tunes the filters in the receive path to match that wavelength. This filters out background light at other wavelengths while passing the laser light. This allows using narrower filters to reduce interference while still accommodating the laser's temperature-induced wavelength drift.

2. Improved Scanning and Detection Methods for LIDAR Interference Avoidance

Suteng Innovation Technology Co., Ltd., 2023

(Summary) Enhancing accuracy and reliability of LIDAR devices for applications like autonomous vehicles through improved scanning, detection and control methods. The methods include scanning selected regions, refining regions based on detection results, and using sensors to monitor and adjust scanning. This allows focusing resources on areas of interest and improving accuracy.


3. Doppler Shift Compensation in LIDAR Systems for Enhanced Object Detection


(Summary) LIDAR system that cancels out Doppler frequency shifts due to target movement to improve object detection accuracy for autonomous vehicles. The system uses a reference channel that measures the unshifted Doppler signal. It then uses mathematical properties of signal mixing to shift the frequency of the imaging channels to cancel or reduce the Doppler shift. This allows extracting the Doppler-shifted information from the imaging channels while suppressing the Doppler shift.


4. Adaptive Mitigation of External Light Interference in LIDAR Devices

Waymo LLC, 2023

(Summary) Protecting a LIDAR device from external light sources that could interfere with its operation, by using proactive and reactive mitigation procedures. The proactive procedure involves operating the LIDAR to emit and detect light with specific timing, wavelengths, intensities, etc., and then adjusting those characteristics if external light is detected to match. The reactive procedure involves activating a shutter or varying emitted/detected light characteristics upon detecting external light. The LIDAR device may also include filters like interference, absorptive, adaptive, or spatial filters to block unwanted wavelengths or light angles.

5. Adaptive Scanning Parameter Adjustment for Interference Mitigation in Mechanical Scanning LiDAR Systems

Seagate Technology LLC, 2023

(Summary) Mitigating interference in mechanical scanning LiDAR systems. The method involves detecting interference from another non-co-located light source and adjusting the LiDAR scanning parameters to avoid interference. When interference is detected, the LiDAR system randomly modifies its scanning trajectory and timing to differentiate its own light from the interfering source.


6. Multi-Board Lidar System Design for Improved Heat Dissipation and Electromagnetic Interference Reduction


(Summary) Lidar system design that improves heat dissipation and reduces electromagnetic interference for better performance and reliability. The Lidar design separates functions onto multiple boards inside the housing - analog processing, digital processing, emitting, receiving, and interfaces - to isolate signals and prevent heat buildup. The emitting and receiving boards are shielded to reduce interference. Heat generating components are attached to the housing for better dissipation.

7. Fusion of Radar, Lidar, and Camera Data for Enhanced Target Detection in Autonomous Vehicles

Quanzhou Equipment Manufacturing Research Institute, 2022

(Summary) Target detection using radar, lidar and camera sensors for applications like autonomous vehicles. The targets detected by radar and camera are used as anchor points to generate 3D regions of interest. The lidar point cloud and camera image are projected onto the regions of interest and fused together. This fused image is processed to output the final detection result.


8. Vehicle Lidar System with Interference Source Detection and Localization

Robert Bosch GmbH, 2022

(Summary) Lidar system for vehicles that can detect and locate interference sources on its window that can impair performance. The system uses secondary detectors positioned on the window to capture scattered light from defects like scratches, dirt or drops inside the window. It compares the scattered light intensity detected by the secondary detectors to locate and identify interference sources.


9. Electromagnetic Isolation in LiDAR Systems for Crosstalk Reduction and Signal Quality Improvement


(Summary) Laser receiving device for LIDAR systems that mitigates crosstalk and increases signal-to-noise ratio. The device has multiple parallel sensor-amplifier-collector-power supply channels for receiving laser echoes. It uses electromagnetic isolation between parallel sensors and amplifiers to prevent noise coupling. The parallel channels are arranged such that each forms an independent current loop, reducing crosstalk and improving signal quality compared to densely packed parallel channels without isolation. The device is used in LiDAR systems for autonomous vehicles and other applications.


10. Wavelength Locking Techniques for Crosstalk Reduction in LIDAR Systems

Waymo LLC, 2021

(Summary) Techniques for reducing crosstalk between adjacent channels of a LIDAR system to ensure accurate detection. The techniques involve locking the wavelengths of adjacent channel's light emitters to different values using feedback signals. For example, volume Bragg gratings or optical filters can be used to select and feedback a narrowband portion of each emitter's output. This prevents adjacent channels from interfering with each other's detection. The gratings/filters can also narrow the emitter bandwidth and reduce temperature dependence.

11. Randomized Timing Technique for Lidar Interference Mitigation

12. Two-Dimensional Multi-Beam LiDAR Transmission with Integrated Optical Phased Array for Interference Avoidance

13. Unique Pulse Pattern Generation and Coherence Filtering for LIDAR Interference Reduction

14. Pulsed LIDAR Interference Detection and Mitigation Method

15. Diffractive Optical Element Integration for Reduced Lidar Crosstalk and Enhanced Autonomous Driving Performance

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