Radar Ranging With Time-Varying Detection Field of View
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Solution Overview
Problem
Lidar systems face challenges in extending measuring range due to rapid energy decay of echoes with distance, leading to signal saturation from short-distance targets, which affects measurement precision and dynamic range.
Innovation Solution
A radar system and method that adjusts control parameters and detection field-of-view according to preset rules within a specific duration to improve measurement precision at short distances while avoiding signal saturation, maintaining long-distance detection capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the lidar emits strong light to extend measuring range, then long-distance detection capability is improved, but short-distance echo signals cause severe saturation distortion
Solution Approach 1:
The patent applies dynamics by making the detection field-of-view adjustable and variable over time. The field-of-view is dynamically changed according to a preset rule, with larger field-of-view at earlier times and smaller field-of-view at later times, allowing the system to adapt to different distance requirements and avoid saturation while maintaining long-distance detection capability
Solution Approach 2:
The patent changes the detection field-of-view parameter over time according to a preset rule. By adjusting the field-of-view parameter dynamically during the detection process, the system can handle both strong short-distance echoes and weak long-distance echoes without saturation distortion
2Length of stationary object
If the lidar emits strong light to extend measuring range, then long-distance detection capability is improved, but signal saturation occurs at short distances
Solution Approach 1:
The patent applies preliminary action by proactively adjusting the detection field-of-view according to a preset rule before saturation can occur. The field-of-view is reduced at specific time points in advance, preventing saturation distortion before it happens while maintaining the ability to detect long-distance targets
Solution Approach 2:
The system dynamically adjusts the detection field-of-view over time, making it variable rather than fixed. This dynamic adjustment allows the system to avoid saturation from strong short-distance echoes while maintaining sensitivity for weak long-distance echoes
3Measurement precision
If the detection field-of-view is reduced to improve short-distance precision, then measurement precision is improved, but long-distance detection capability deteriorates
Solution Approach 1:
The patent resolves this contradiction by making the field-of-view dynamic rather than static. The field-of-view is adjusted according to a preset rule that reduces it at specific time points, allowing the system to achieve high short-distance precision when needed while maintaining long-distance detection capability at other times
Solution Approach 2:
The system performs preliminary adjustment of the field-of-view based on predicted echo arrival times. By reducing the field-of-view at appropriate time points before saturation occurs, the system prevents distortion while preserving long-distance detection capability for echoes arriving at different times
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
Enhances measurement precision and dynamic range by dynamically adjusting control parameters and detection field-of-view, preventing signal saturation at short distances without compromising long-range detection.
Implementation Method 1
receiving reflected light after the emitted light is reflected by a target object, and converting the reflected light into a received electrical signal
Data Source
AI summary
A radar system and a radar ranging method. The radar system comprises: a light emission assembly (100), which successively emits a plurality of groups of emitted light; a receiving end assembly (200), which receives reflected light after the emission light is reflected by a target object and converts the reflected light into a received electrical signal; a light scanning member (300); and a processor (600), which determines the distance to the target object according to the received electrical signal, and adjusts control parameters related to the received electrical signal and a detection field-of-view angle, such that the control parameters change according to a first preset rule starting from an emission start moment; or the detection field-of-view angle changes according to a second preset rule starting from the emission start moment.