LIDAR Position Detection With Ambient-Light Polarization Adaptation
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Solution Overview
Problem
Existing LIDAR devices suffer from varying signal-to-noise ratios due to ambient light polarization changes throughout the day, affecting system performance and range.
Innovation Solution
Incorporation of a passive polarization adaptation unit with a polarization filter matrix and an active polarization adaptation unit, which control the reception and transmission light signals respectively, to maintain optimal polarization alignment with ambient light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laser source emits linearly polarized light as transmission light signal, then the system can operate with conventional LIDAR technology, but the signal-to-noise ratio varies as a function of time of day due to ambient light polarization changes
Solution Approach 1:
The patent implements dynamic polarization adaptation by switching between different polarization states (linear and circular) based on the time of day and ambient light conditions. The system transitions from static linear polarization to dynamic polarization switching, allowing the transmission light signal to adapt to changing ambient polarization patterns throughout the day, thereby maintaining stable signal-to-noise ratio
Solution Approach 2:
The patent changes the polarization parameter of the transmission light signal from fixed linear polarization to variable polarization states. By modifying the polarization angle and type (linear/circular) based on ambient conditions, the system optimizes the signal-to-noise ratio at different times of day, resolving the contradiction between measurement precision and reliability
2Reliability
If conventional LIDAR devices are used without polarization adaptation, then the device complexity remains low, but the range and detection reliability deteriorate due to varying ambient light polarization
Solution Approach 1:
The patent segments the polarization control into distinct functional modules: a polarization generation unit that creates different polarization states, and a polarization selection unit that chooses the appropriate state based on time of day. This segmentation allows the system to achieve high detection reliability through intelligent polarization management while keeping the overall device architecture organized and manageable
Solution Approach 2:
The system implements self-service polarization adaptation by automatically detecting the time of day and selecting appropriate polarization states without external intervention. The control unit autonomously manages the polarization switching based on pre-programmed temporal patterns, reducing the need for complex external control mechanisms while maintaining high detection reliability
3Ease of manufacture
If the polarization of the transmission light signal is fixed, then the emitter design is simple, but the system performance varies as a function of time of day due to scattering of sunlight at air molecules
Solution Approach 1:
The patent transforms the fixed polarization emitter design into a dynamic system that can switch between different polarization states. By introducing controllable polarization elements that can change the transmission light signal's polarization based on time of day, the system maintains ease of manufacture through modular additions while achieving stable performance across varying environmental conditions
Solution Approach 2:
The system performs preliminary polarization selection based on the time of day before the light signal is transmitted. The control unit pre-determines the appropriate polarization state according to anticipated ambient light conditions, allowing the emitter to be designed with straightforward polarization generation capabilities while achieving reliable performance through advance polarization configuration
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
Stabilizes system performance and improves signal-to-noise ratio by 25% to 100%, enabling reliable detection of distant objects regardless of time of day.
Implementation Method 1
a passive polarization adaptation unit that is configured to control a polarization of the reception light signal as a function of an ambient light signal
Implementation Method 2
The change in the predominant polarization of the ambient light with the time of day takes place due to the scattering of sunlight at the air molecules in the atmosphere
Implementation Method 3
an active polarization adaptation unit, which control the reception and transmission light signals respectively, to maintain optimal polarization alignment with ambient light conditions
Data Source
AI summary
A device for determining a position of an object is provided. The device includes at least one first emitter configured to emit a first transmission light signal that travels from the device to the object, and at least one detector that is configured to detect a reception light signal that travels from the object to the detector. The detector includes at least one pixel matrix that includes at least one pixel. The device includes at least one passive polarization adaptation unit configured to control a polarization of the reception light signal as a function of an ambient light signal. A method for determining a position of at least one object with the aid of such a device is also described, in which the measuring-control element measures a first signal-to-noise ratio at a first measuring point in time, and a second signal-to-noise ratio at a second measuring point in time.