Laser Radar Echo Processing for Higher Signal-to-Noise Detection
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Solution Overview
Problem
Existing laser radars face interference from irrelevant signals such as solar light and white noise, affecting the accuracy of echo information and reducing the signal-to-noise ratio.
Innovation Solution
A method involving a scanning-type reflection module to reflect laser light at a specific angle, converging electrical signals from multiple detection units to identify characteristic signals, determining target distances, and selecting relevant detection units to enhance signal accuracy by reducing interference and increasing the signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a scanning-type laser radar uses a transmission technology in which a transmitting path and a receiving path are not coaxial, then the field of view can be expanded through scanning, but the receiving field of view becomes large and echo information is easily affected by irrelevant signals such as solar light and white noise
Solution Approach 1:
The patent segments the detection process by dividing the field of view into multiple detection areas and using multiple detection units (first detection unit and second detection unit) to detect different areas separately. This segmentation allows the system to focus on specific regions, reducing the impact of irrelevant signals from other areas while maintaining an expanded field of view through coordinated scanning of multiple units.
2Area of moving object
If the receive end covers an entire field of view corresponding to a scanning angle of the transmit end, then the field of view is expanded, but the signal-to-noise ratio of the received signal decreases due to interference from irrelevant signals
Solution Approach 1:
The patent applies local quality by assigning different detection units to detect specific local areas (first detection area and second detection area) rather than having a single receiver cover the entire field of view. Each detection unit is optimized for its specific region, which improves the signal-to-noise ratio by reducing interference from irrelevant signals in other areas while collectively maintaining an expanded receiving field of view.
3Area of moving object
If multiple detection units are used to expand the field of view, then the detection coverage is increased, but the complexity of signal processing and identification of relevant echo information increases
Solution Approach 1:
The patent implements preliminary action by pre-establishing correspondence relationships between detection units, detection areas, and reflection modules before actual detection begins. The processor is configured with predetermined rules for determining which detection unit corresponds to which detection area and which reflection module should reflect laser light to which area. This preliminary configuration simplifies the real-time signal processing by providing a structured framework for identifying relevant echo information among multiple detection units.
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
Accurately determines echo information by reducing irrelevant signal interference and improving the signal-to-noise ratio, enabling precise laser radar detection.
Implementation Method 1
reflecting first laser light to a detection area at a first angle by using a scanning-type reflection module
Implementation Method 2
an array detector is used at a receive end to receive an optical signal returned from the field of view and convert the optical signal into an electrical signal
Data Source
Figure 1
Figure 2~3
Figure 4(a)~4(d)
AI summary
This application provides a signal processing method and a related apparatus, and in particular, relates to a laser radar. The method includes: reflecting first laser light to a detection area at a first angle by using a scanning-type reflection module (S201); determining a first converged electrical signal based on at least two electrical signals from at least two detection units (S202), where the first converged electrical signal includes at least one characteristic signal; determining at least one target distance corresponding to the detection area based on time information of the at least one characteristic signal (S203); determining at least one detection unit group based on the at least one target distance and the first angle (S204), where detection units included in a detection unit group in the at least one detection unit group belong to at least two detection units; and determining at least one piece of echo information in the detection area based on a first electrical signal obtained based on at least one electrical signal from a first detection unit group in the at least one detection unit group (S205). The method and apparatus can reduce interference of irrelevant signals in radar echo information, and improve a signal-to-noise ratio of received signals.