Radar Self-Diagnosis Using Delay Line Waveform Comparison
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Solution Overview
Problem
Existing radar systems require complex and expensive structures for self-diagnosis, including displacement oscillation circuits and analysis processing units, making them costly and intricate.
Innovation Solution
A radar system utilizing a delay line to delay radar waves by a predetermined amount, with a detection circuit to identify abnormal waveforms that differ from expected delayed waveforms, allowing for self-diagnosis using a simple and inexpensive structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If displacement oscillation circuits and analysis processing circuits are used for self-diagnosis, then abnormality detection capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts only the essential diagnostic function by removing complex displacement oscillation circuits and analysis processing circuits. Instead, it uses a simple delay line to generate expected delayed waveforms and a detection circuit to identify abnormalities, keeping only the minimum necessary components for self-diagnosis.
Solution Approach 2:
The patent replaces expensive, complex diagnostic circuits with inexpensive components. The delay line and detection circuit are much simpler and cheaper than displacement oscillation circuits, achieving the same abnormality detection function at lower cost and complexity.
2Reliability
If displacement oscillation circuits and analysis processing circuits are used for self-diagnosis, then abnormality detection capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent substitutes expensive displacement oscillation circuits and analysis processing circuits with inexpensive delay lines and simple detection circuits. This dramatically reduces manufacturing cost while maintaining the ability to detect abnormalities in the radar system.
Solution Approach 2:
The patent removes costly complex diagnostic components and retains only the essential function using simpler, cheaper components. The delay line and detection circuit provide adequate abnormality detection at a fraction of the cost of traditional approaches.
3Measurement precision
If complex diagnostic circuits are used, then measurement precision of abnormality detection is improved, but device complexity increases
Solution Approach 1:
The radar system performs self-diagnosis using its own transmitted waveform and a simple delay line to generate the expected delayed waveform. The detection circuit compares the actual received waveform with the expected waveform, enabling the system to self-diagnose without external complex diagnostic equipment.
Solution Approach 2:
The delay line serves multiple functions: it generates the expected delayed waveform for comparison and acts as a reference for abnormality detection. This multi-functional approach eliminates the need for separate complex diagnostic circuits while maintaining 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 easy detection of system abnormalities using a cost-effective and straightforward setup, distinguishing normal from abnormal waveforms without the need for complex diagnostic circuits, thus reducing system size and cost.
Implementation Method 1
a delay line which has an end connected to an output port of the transmission circuit and an other end connected to an input port of the receiving circuit, and which delays the radar wave by a predetermined delay amount
Data Source
AI summary
The radar system includes: a transmission circuit transmitting the radar waves via a transmission antenna; a receiving circuit receiving the reflected waves via a receiving antenna; a delay line having an end connected to aid transmission circuit and the other end connected to said receiving circuit, which delays the radar waves by a predetermined delay amount; a correlation circuit/coherent detection circuit which detects a waveform having a strength equal to or higher than a predetermined strength, from a signal provided from said receiving circuit which obtains the signal from the reflected waves or the delayed radar waves; and a level decision circuit which judges, during self-diagnosis, whether or not the detected waveform is a waveform of the delayed radar wave according to the predetermined delay amount, and if the waveform is not the waveform of the delayed radar wave, determines that abnormality occurs in said radar system.