Vehicle Radar Code Sequence Interference Management
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Solution Overview
Problem
Radar systems in advanced driver-assistance systems (ADAS) face interference issues when multiple vehicles use the same code sequence for object detection, leading to errors in distance calculation due to overlapping transmission signals, which can obstruct vehicle operations.
Innovation Solution
An object detection apparatus and method that changes the code sequence used by a vehicle when interference is detected, utilizing a processor and communicator to switch to a target code sequence with low correlation to existing sequences, thereby minimizing interference and ensuring accurate object detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple vehicles use the same code sequence for radar transmission, then the radar system can operate with simple configuration, but interference occurs leading to errors in distance calculation
Solution Approach 1:
The patent changes the code sequence parameter dynamically. When interference is detected through correlation analysis, the radar system switches from a current code sequence to a different code sequence from a pre-stored set, thereby changing the transmission signal characteristics to eliminate interference and improve measurement precision
Solution Approach 2:
The patent implements a feedback mechanism where the radar system continuously monitors received signals for interference by calculating correlation values. When the correlation value exceeds a threshold indicating interference, the system triggers a code sequence change, creating a closed-loop control that maintains measurement accuracy
2Measurement precision
If the radar system continuously monitors for interference, then object detection accuracy is maintained, but system complexity and processing load increase
Solution Approach 1:
The patent performs preliminary actions by pre-storing multiple code sequences in the radar system before operation. This preparation allows the system to quickly switch code sequences when interference is detected, avoiding the need for complex real-time code generation or selection algorithms
Solution Approach 2:
The patent changes the monitoring threshold parameter dynamically. The correlation threshold for detecting interference is set based on predefined criteria, allowing the system to adjust its sensitivity and balance between detection accuracy and false alarm rates, thereby controlling system complexity
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 solution effectively reduces interference from other vehicles using the same code sequence, enhancing the accuracy of object detection and preventing errors in distance calculation, thereby improving the reliability of ADAS operations.
Implementation Method 1
a transmitter that transmits a signal
Implementation Method 2
detecting a signal reflected by the object
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A method performed by an apparatus included in a vehicle to detect an object using a radar includes: propagating, in a normal mode period of an operating period for detecting objects, a normal mode transmission signal generated based on a default code sequence including at least two codes; receiving a normal mode reception signal in the normal mode period; detecting, in the normal mode period, an object based on the default code sequence and the normal mode reception signal; receiving a listening mode reception signal in a listening mode period of the operating period; acquiring a correlation between the listening mode reception signal and the default code sequence; and changing the default code sequence based on the correlation.