Distributed Vehicle Radar With Optical Links for Micro-Doppler Detection
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Solution Overview
Problem
Existing radar systems for vehicles have low resolution and are time-consuming in data transmission and processing, especially when multiple radar devices are used, and they struggle to provide reliable movement information about surrounding vehicles under adverse weather conditions.
Innovation Solution
A radar system with multiple distributed radar devices and a central control device uses optical transmission techniques for fast data exchange, employing micro-Doppler analysis to determine the movement of surrounding vehicles, allowing for real-time, high-resolution movement information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple radar devices are used to improve detection coverage and reliability, then the resolution and processing speed deteriorate due to data transmission and processing time consumption
Solution Approach 1:
The patent combines multiple radar devices into a unified radar system with a central control device that coordinates signal transmission and reception across all devices. This merging approach allows the system to process radar returns from multiple devices simultaneously through a single central unit, eliminating the need for each device to independently process data. The central control device aggregates signals from multiple radar devices, enabling improved detection reliability through combined data while maintaining efficient processing speeds through centralized coordination.
2Area of stationary object
If multiple radar devices are distributed around the vehicle to capture environment data, then the measurement precision deteriorates due to low resolution of individual radar devices
Solution Approach 1:
The patent divides the environment monitoring task into multiple segments, with each radar device responsible for capturing data from a specific spatial zone around the vehicle. The front radar device monitors the forward area, side devices monitor lateral zones, and rear devices monitor the backward area. Each segmented radar device focuses its detection capabilities on its designated zone, allowing the system to achieve comprehensive environmental coverage while maintaining measurement precision through specialized, zone-specific detection rather than requiring every device to provide high-resolution data for all areas.
Solution Approach 2:
The patent transitions from two-dimensional radar detection (single plane) to three-dimensional spatial detection by distributing radar devices throughout the vehicle's environment. Devices are positioned at different locations (front, sides, rear) and orientations, creating a three-dimensional detection network. This dimensional expansion allows the system to capture environmental data from multiple spatial perspectives simultaneously, achieving comprehensive coverage while each individual device maintains its resolution capabilities for its specific viewing angle and distance zone.
3Speed
If micro-Doppler analysis is applied to determine movement information, then the speed of obtaining movement information improves, but the device complexity increases
Solution Approach 1:
The patent implements a universal central control device that performs multiple functions: coordinating signal transmission across multiple radar devices, processing radar returns from all devices, applying micro-Doppler analysis to extract movement information, and generating control commands. This single multi-functional unit eliminates the need for separate specialized processors for each radar device and for the micro-Doppler analysis itself. The central control device's multi-functionality reduces overall system complexity despite the advanced processing capabilities required for rapid movement information extraction.
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
The system provides quick and reliable movement information about surrounding vehicles, enabling accurate control commands for driving, braking, and steering, even in adverse weather conditions, supporting semi-automatic or fully automatic driving.
Implementation Method 1
at least one radar device configured to capture at least one object in an environment of the vehicle
Implementation Method 2
The micro-Doppler signature is caused by the micro-Doppler effect that occurs during rotation of at least a part of a moving object. The rotating part of the moving object introduces a frequency shift in the echo captured by the at least one receiving antenna of the radar device due to the micro-Doppler effect.
Data Source
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AI summary
The invention relates to a method to provide a movement information (14) about at least one second vehicle (5) by a first vehicle (1), comprising: capturing radar information (11) describing at least a part of an environment (6) of the first vehicle (1) in which the at least one second vehicle (5) is located, by a radar system (2) of the first vehicle (1) comprising multiple radar devices (3); determining a micro-Doppler information (12) describing at least one micro-Doppler signature in the captured radar information (11); determining a movement information (14) describing a movement of the at least one second vehicle (5); and providing the determined movement information (14). The radar system (2) captures the radar information (11) by using at least partially optical transmission techniques for radar system internal transmission of data between the individual radar devices (3) and a central control device (4) of the radar system (2).