Active Optical Sensor Array Filtering for False-Positive Scanning Points
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Solution Overview
Problem
Active optical sensor systems, such as lidar systems, face issues with false-positive scanning points caused by noise or crosstalk, which existing methods cannot effectively address without falsifying measured signal times of flight and distances.
Innovation Solution
The method involves comparing measurement signals from different detectors in the sensor system. If one measurement signal indicates a light pulse with a specified minimum energy, the other measurement signal can be partially discarded based on the comparison, thereby reducing false-positive scanning points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measurement signals from neighboring detectors are reduced to eliminate crosstalk, then false-positive scanning points are reduced, but the measured signal time of flight and distance are falsified
Solution Approach 1:
The patent extracts and removes only the crosstalk components from measurement signals of neighboring detectors, rather than reducing the entire signal. By identifying and separating the harmful crosstalk portion from the valid measurement portion, the method eliminates false-positive scanning points while preserving the accuracy of genuine distance measurements.
Solution Approach 2:
The patent applies different processing treatments to different parts of the measurement data. Valid measurement signals are preserved with their original characteristics, while only the crosstalk components identified in neighboring detectors are removed. This localized processing ensures that each part of the signal is treated according to its actual nature.
2Reliability
If measurement signals are filtered to remove crosstalk, then the quality of measurement data is improved, but the complexity of signal processing increases
Solution Approach 1:
The patent employs a self-service mechanism where each detector's measurement signal automatically triggers the evaluation and potential removal of crosstalk in neighboring detectors. The system uses the presence of a valid measurement signal as its own criterion to identify and remove corresponding crosstalk components, eliminating the need for external complex filtering algorithms.
Solution Approach 2:
The patent implements a feedback mechanism where the measurement signal from one detector provides information about potential crosstalk in neighboring detectors. This feedback loop allows the system to dynamically identify and remove crosstalk components based on the actual measurement data, improving signal quality adaptively without requiring predetermined complex filtering parameters.
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 improves the quality of measurement data by reducing false-positive scanning points while minimizing the risk of false-negative determinations, thus providing more accurate distance measurements.
Implementation Method 1
light pulses reflected in an environment of the sensor system are captured by means of an array of optical detectors of the sensor system and a multiplicity of measurement signals are generated by means of the array based on the captured light pulses
Data Source
AI summary
According to a method for filtering measurement data of a sensor system (2), light pulses (5) reflected in the environment of the sensor system (2) are captured by means of an array (7) of optical detectors (8, 9, 10). A multiplicity of measurement signals (11, 12) are generated by means of the array (7) based on the captured light pulses. A computing unit (3) identifies a first measurement signal (11) whose pulse energy is greater than a specified minimum energy, wherein the first measurement signal (11) was generated by a first detector (8). A second measurement signal (12) is compared with the first measurement signal (11) by means of the computing unit (3), wherein the second measurement signal (12) was generated by a second detector (9), which is at a distance from the first detector (8) that is less than or equal to a specified maximum distance. The computing unit discards at least a part of the second measurement signal depending on a result of the comparison.