Ranging Device Sensitivity Adjustment and Noise Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Light ranging devices face challenges in maintaining accurate ranging when the quantity of reflected light is decreased due to interference attacks or blind spots, leading to increased noise components in the electric signal, which complicates distance measurement.
Innovation Solution
A ranging device with a sensitivity adjustment unit to enhance the responsivity of the light receiving element and a noise removal unit to analyze the temporal transition of phase differences between emitted and received light, removing noise components from the signal to ensure accurate ranging even under low light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the responsivity of the light receiving element is heightened to counter blind attack, then the sensitivity to reflected light is improved, but the noise components in the electric signal increase
Solution Approach 1:
The patent extracts and removes noise components from the electric signal generated by the light receiving element. The noise removal unit processes the signal to separate and eliminate noise, allowing the system to maintain high sensitivity while mitigating the harmful effect of increased noise components.
Solution Approach 2:
The patent employs feedback mechanisms where the control unit monitors the electric signal from the light receiving element and adjusts the bias voltage accordingly. This feedback loop allows the system to maintain optimal operating conditions, balancing sensitivity enhancement with noise control through dynamic adjustment.
2Power
If the bias voltage is increased to heighten responsivity, then the signal strength is improved, but the noise components increase
Solution Approach 1:
The patent dynamically changes the bias voltage parameter based on operating conditions. The control unit adjusts the bias voltage to optimize the balance between signal strength and noise levels, rather than maintaining a fixed high voltage. This parameter adjustment allows the system to achieve high signal strength while controlling noise through optimized voltage levels.
3Device complexity
If a single sensor is used for ranging, then the device complexity is reduced, but the system becomes vulnerable to interference attacks
Solution Approach 1:
The patent introduces an intermediary processing system that includes a control unit and noise removal unit. These intermediary components process the signal from the single sensor, enabling the system to resist interference attacks through signal processing rather than through multiple sensors. The intermediary processing layer compensates for the vulnerability of single-sensor 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
Enables correct ranging even when the light quantity of reflected light is decreased, effectively managing noise and maintaining a high signal-to-noise ratio by adjusting responsivity and removing noise components.
Implementation Method 1
a light receiving element 400 that receives the reflected light 401
Implementation Method 2
The APD is a light receiving element capable of heightening the sensitivity of a photodiode, using an avalanche amplification principle
Data Source
AI summary
A sensitivity adjustment unit (102) adjusts a responsivity of a light receiving element (400) so that the responsivity becomes high. A noise removal unit (103) analyzes, after the responsivity is adjusted by the sensitivity adjustment unit (102), a temporal transition of a phase difference between an irradiation light emitted from a light emitting element (300) paired with the light receiving element (400) and a light received by the light receiving element (400) including a reflected light reflected by a ranging target (200) being a target of ranging, and removes a noise component included in the light received by the light receiving element (400).