Radar Hardware Fault Detection Using Down-Converted Phase Analysis
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Solution Overview
Problem
Radar systems face challenges in detecting hardware faults such as ball breaks or conduction defects in transmitting and receiving paths, which cause phase deviations and reduce sensor performance, particularly in MIMO systems used for precise object detection.
Innovation Solution
A radar device and method that utilizes a fault detection circuit to analyze the phase of down-converted reception signals, employing techniques like discrete Fourier transform and Goertzel algorithm to detect hardware faults based on phase changes, using frequency-modulated continuous wave radar signals and crosstalk between transmitting and receiving antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional DC resistance measurement is used to detect ball breaks, then hardware faults can be detected, but noise figure deteriorates significantly
Solution Approach 1:
The patent replaces the conventional DC resistance measurement method with an RF-based detection method using phase noise analysis. Instead of measuring DC resistance directly at the Rx input pad, the system uses the RF oscillator signal transmitted through the Tx path, measures its phase noise characteristics after transmission, and detects ball breaks based on phase deviations. This substitution eliminates the need to introduce DC measurement circuits into the sensitive RF reception path, thereby avoiding noise figure deterioration while maintaining ball break detection capability.
2Measurement precision
If MIMO radar systems use multiple transmitting and receiving channels for precise object detection, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent makes the RF oscillator signal serve multiple functions: it acts as the transmission signal for the MIMO radar system and simultaneously serves as the test signal for ball break detection. The same oscillator signal is used for both normal radar operation and hardware fault detection, eliminating the need for separate test signals or dedicated detection circuits. This multi-functionality approach maintains measurement precision while reducing device complexity.
Solution Approach 2:
The MIMO radar system performs self-diagnosis by using its own transmitted RF oscillator signal to detect hardware faults. The system monitors the phase noise characteristics of its own transmission signal after it passes through the transmission path and solder balls, enabling autonomous detection of ball breaks without external testing equipment. This self-service capability reduces overall system complexity while maintaining high detection precision.
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 robust detection of conduction defects and solder joint issues by identifying constant phase deviations, even during normal radar operation, improving sensor performance and reliability.
Implementation Method 1
a transmitter circuit (Tx circuit), configured to generate a microwave or radiofrequency oscillator signal (RF oscillator signal) and to transmit an RF fault detection signal based on the RF oscillator signal
Implementation Method 2
a receiver circuit (Rx circuit) configured to receive an RF reception signal based on the RF fault detection signal and to mix the RF reception signal with the RF oscillator signal in order to obtain a down-converted reception signal
Implementation Method 3
a fault detection circuit (fault detection unit) configured to detect a hardware fault of the radar device based on a phase of the down-converted reception signal
Data Source
AI summary
The present disclosure relates to a radar device, including a transmitter circuit configured to generate an RF oscillator signal and to transmit an RF fault detection signal based on the RF oscillator signal, a receiver circuit configured to receive an RF reception signal based on the RF fault detection signal and to mix the RF reception signal with the RF oscillator signal in order to obtain a down-converted reception signal, and a fault detection circuit configured to detect a hardware fault of the radar device based on a phase of the down-converted reception signal.