Autonomous Obstacle Detection Using Synthetic Aperture Radar
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Solution Overview
Problem
Existing autonomous moving objects face challenges in reliably detecting obstacles using single radar sensors due to ambiguity in object localization and complexity issues with multi-antenna arrays, particularly in real-world environments with multi-path fading.
Innovation Solution
Implementing a radar-based system with a single radar sensor that uses synthetic aperture radar processing to acquire a sequence of radar responses at different positions, creating a virtual antenna array for spatially resolved obstacle detection, allowing for reliable obstacle detection and avoidance without trilateration or multi-antenna arrays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple distance sensors are used with trilateration or beamforming to resolve spatial ambiguity, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies synthetic aperture radar processing to transform a single sensor's temporal sequence of measurements into spatial information. By moving the sensor through space and processing the sequence of radar responses, the system creates a virtual array that provides angular resolution without requiring multiple physical antennas. This dimensional transformation from temporal to spatial domain resolves the contradiction by achieving high measurement precision through signal processing rather than hardware complexity.
2Measurement precision
If beamforming techniques are used to achieve high spatial resolution, then measurement precision is improved, but device complexity increases due to phase coherent requirements and multiple receiver antennas
Solution Approach 1:
The patent creates a virtual copy of a multi-antenna array system through synthetic aperture radar processing. Instead of physically implementing multiple receiver antennas with phase coherent signal paths, the system uses a single antenna that moves through space, capturing radar responses that are then processed to simulate the spatial resolution of a multi-antenna array. This virtual copying approach achieves the same measurement precision without the hardware complexity of actual antenna arrays.
3Device complexity
If a single radar sensor is used, then device complexity is reduced, but measurement precision deteriorates due to inability to distinguish different directions
Solution Approach 1:
The patent transforms a static single-sensor system into a dynamic measurement system. By moving the single radar sensor through space along a movement path and processing the temporal sequence of radar responses, the system dynamically generates spatial resolution. The motion of the sensor creates different viewing angles over time, and the synthetic aperture radar processing combines these dynamic measurements to achieve angular resolution that would otherwise require multiple static sensors.
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 accurate and robust obstacle detection, including obstacles above the movement path, with improved signal-to-noise ratio and reduced complexity, facilitating better decision-making for obstacle avoidance.
Implementation Method 1
a radar sensor mounted on the autonomous moving object and configured to scan a volume in front of the object
Data Source
AI summary
The disclosure relates to an autonomous moving object comprising: a radar sensor configured to scan a volume in front of the object, and a radar signal processor configured to: acquire a sequence of radar responses, each radar response of the sequence being acquired at a different position (P) of the autonomous moving object, and perform synthetic aperture radar processing of at least parts of the acquired sequence of radar responses to obtain a synthetic aperture radar image representing response amplitude as a function of at least distance and angle with respect to the radar sensor, the autonomous moving object further comprising: a controller configured to detect presence of a potential obstacle within a pre-defined sub-volume in front of the autonomous moving object by analyzing the synthetic aperture radar image and, in response to detecting presence of a potential obstacle, output a control command configured to cause a changed movement of the autonomous moving object.