Radar Sensor Synchronization via Overlapping Detection Ranges
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Solution Overview
Problem
Existing radar systems for motor vehicles face challenges in synchronizing multiple sensor modules efficiently, leading to increased costs and latency issues due to the need for dedicated cabling or data bus systems, which can result in interference and reduced communication capabilities.
Innovation Solution
The method involves overlapping the detection ranges of sensor modules to allow one module to receive transmission signals from another, using frequency modulated continuous wave (FMCW) signals for synchronization, and employing controllable directional characteristics to minimize interference, enabling precise synchronization without dedicated synchronization lines or high bus loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dedicated synchronization lines are used to synchronize sensor modules, then synchronization precision is improved, but system cost and complexity increase due to additional cabling and assembly requirements
Solution Approach 1:
The patent combines the synchronization function with the existing radar detection function by having sensor modules transmit radar signals that serve dual purposes: normal obstacle detection and synchronization information transmission. This eliminates the need for separate synchronization lines while maintaining synchronization precision.
Solution Approach 2:
The radar transmission signals are designed to serve multiple functions simultaneously: they perform normal obstacle detection and also convey synchronization information to other sensor modules. This multi-functionality removes the need for dedicated synchronization infrastructure.
2Device complexity
If a data bus is used to transmit synchronization signals between sensor modules, then system cost is reduced, but synchronization precision deteriorates due to long latency times and bus load increases
Solution Approach 1:
The patent replaces the electrical data bus transmission mechanism with an electromagnetic wave-based synchronization approach. Radar signals transmitted through space provide synchronization information with minimal latency, eliminating the bottleneck of electrical bus systems.
Solution Approach 2:
The patent introduces electromagnetic waves (radar signals) as an intermediary medium for transmitting synchronization information between sensor modules. This intermediary enables direct, high-speed communication without relying on the constrained data bus infrastructure.
3Object-affected harmful factors
If sensor modules operate with non-overlapping detection ranges to avoid mutual interference, then interference is minimized, but synchronization capability is lost
Solution Approach 1:
The patent applies different operational modes to different spatial zones: in non-overlapping regions, modules operate in normal detection mode without interference concerns; in overlapping regions, modules switch to synchronization mode where transmitted signals are evaluated by neighboring modules for synchronization information.
Solution Approach 2:
The patent changes the operational parameters of sensor modules based on their spatial relationship. Modules in overlapping detection ranges adjust their signal transmission and evaluation parameters to enable synchronization while managing interference, whereas modules in non-overlapping ranges maintain standard operation.
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 allows for simple, cost-effective, and flexible synchronization of sensor modules, reducing interference and maintaining system performance by allowing sensor modules to adjust their operations based on the state of adjacent modules, while also enabling continuous obstacle detection and reduced latency.
Implementation Method 1
the first sensor module receives a transmission signal emitted by the additional sensor module in a monitoring mode in order to obtain information about the operating state of the additional sensor module
Implementation Method 2
an FMCW (frequency modulated continuous wave) signal is used as the transmission signal, in which the frequency is changed over time between a start frequency and a stop frequency
Data Source
Figure 1
Figure 2
Figure 3a~4
AI summary
The invention relates to a method for operating a radar system (100) especially of a motor vehicle (200), comprising at least one first sensor module (110a) and at least one additional sensor module (110b). A detection range (A) of the first sensor module (100a) at least partly overlaps a detection range (B) of the additional sensor module (110b) while the first sensor module (100a) receives a transmit signal transmitted by the additional sensor module (110b) in a monitoring mode (305) in order to obtain information about the operating condition of the additional sensor module (110b).