Synchronized Radar Sensor System for Bistatic Object Detection
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Solution Overview
Problem
Current radar sensors for advanced driver assistance and automated driving require high processing power and memory due to extensive internal data processing, and struggle with wave propagation issues that mask less reflective objects, particularly in parking scenarios.
Innovation Solution
A radar sensor system comprising at least two radar sensors with synchronized transmission and reception, allowing for bistatic evaluation by overlapping detection ranges and compensating for frequency offsets to enhance object classification, particularly in short-range applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If extensive internal data processing is performed in radar sensors, then object-level data is provided for further analysis, but processing power and memory capacity requirements increase
Solution Approach 1:
The system divides the data processing task between multiple radar sensors and a central evaluation device. Each sensor performs initial signal processing and transmits raw or partially processed data, while the central evaluation device performs the computationally intensive object classification and analysis. This segmentation allows sensors to remain relatively simple while achieving sophisticated object-level recognition through distributed processing.
2Length of stationary object
If wave propagation is used for detection, then detection range is extended, but less reflective objects are masked by strong reflections from walls
Solution Approach 1:
The system uses multiple radar sensors as intermediaries to detect objects that would otherwise be masked. By positioning sensors at different locations and evaluating their combined data, the system can identify less reflective objects (such as posts) that are obscured by strong reflections from walls in single-sensor configurations. The multiple sensors provide complementary viewing angles that reveal objects hidden from any single sensor's perspective.
3Measurement precision
If multiple radar sensors are used to improve detection, then object classification is enhanced, but system complexity and synchronization requirements increase
Solution Approach 1:
The system employs feedback mechanisms to manage synchronization between multiple radar sensors. The central evaluation device coordinates the operation of individual sensors, adjusting their timing and parameters based on detected conditions and performance feedback. This allows the system to maintain optimal synchronization without requiring overly complex predetermined coordination protocols, as the system adapts its synchronization based on actual operating conditions.
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 improved object detection and classification with reduced computational requirements, optimizing synchronization and minimizing errors for accurate distance estimation in parking and similar scenarios.
Implementation Method 1
Vehicles with advanced driver assistance or automated driving functions are increasingly being equipped with radar sensors
Implementation Method 2
walls reflect strongly and thus less reflective objects, such as posts, are masked
Implementation Method 3
Bistastatic analyses in connection with ultrasound are known. These involve evaluating the time-of-flight differences between acoustic and electrical signals
Data Source
Figure 1~2
AI summary
The invention relates to a radar sensor system (100) having: - at least two radar sensors (10, 20) each having at least one transmitter and at least one receiver, wherein detection regions of the two radar sensors (10, 20) at least partly overlap, wherein the two radar sensors (10, 20) are spaced apart in a defined manner, wherein transmitted signals from the two radar sensors (10, 20) can be synchronised in such a way that radiation emitted by a radar sensor (10, 20) and reflected by an object (200), which radiation has been emitted by the respective other radar sensor (10, 20), can be evaluated by means of an evaluation device (30).