Radar Device Direct Wave Failure Detection
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Solution Overview
Problem
Conventional radar devices struggle to stably detect failures during operation without relying on reflected waves, which are prone to fluctuations due to varying distances, speeds, and environmental conditions.
Innovation Solution
A radar device that includes at least one transmission module generating a synchronized transmission chirp signal, and at least two reception modules receiving both the reflected wave and a direct wave of the transmission chirp signal. The device performs mixing using a reception chirp signal and detects the target based on a beat signal, while also determining device failure by comparing the level of the direct wave component with a threshold set without reflected waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reflected waves are used to detect failure, then failure detection capability is provided, but stability of detection deteriorates due to signal level fluctuations from varying distances, speeds, and environmental conditions
Solution Approach 1:
The invention extracts and utilizes the direct wave component from the transmission chirp signal, separating it from the reflected wave detection method. By measuring the direct wave level that travels directly from transmission to reception modules without reflecting off targets, the system obtains a stable reference signal that is independent of target distance, speed, and environmental conditions, thereby resolving the stability issue while maintaining failure detection capability
Solution Approach 2:
The direct wave serves as an intermediary reference signal between the transmission and reception modules. This intermediary provides a stable baseline measurement that mediates the failure detection process, allowing the system to compare expected direct wave levels against actual measurements to detect failures without being influenced by reflected wave variations
2Reliability
If reflected waves are used for failure detection, then failure detection is enabled, but device versatility is limited due to need to avoid false determination and impose limitations on reflected wave conditions
Solution Approach 1:
The invention makes the failure detection system universal by using the direct wave, which is inherently present in all radar operations regardless of target conditions. This approach eliminates the need for specific reflected wave conditions or restrictions on detection scenarios, allowing the radar to function versatilely in diverse environments without imposing limitations on target types, distances, or speeds
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 stable failure detection during operation without using reflected waves, thereby improving the radar device's versatility and accuracy in determining device malfunctions.
Implementation Method 1
perform mixing on a received signal, using a reception chirp signal
Data Source
AI summary
A radar device includes a transmission module that generates a transmission chirp signal, and reception modules that each receive a reflected wave and a direct wave of the transmission chirp signal, and perform mixing on a received signal, using a reception chirp signal. The radar device includes a signal processing unit that detects a target on the basis of a beat signal resulting from the mixing performed by the reception modules. The signal processing unit detects a level of the beat signal generated from the received direct wave. The signal processing unit determines a failure of the radar device by comparing the detected level with a threshold set on the basis of a beat signal level measurement under an environment that eliminates the reflected wave in advance. The transmitted chirp signal distributed from the transmission module is used as the reception chirp signal.