FMCW Radar Blockage Detection via Frequency Offset Signal Segmentation
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Solution Overview
Problem
Existing radar devices face challenges in accurately detecting blockages caused by foreign matter accumulation, such as mud, ice, or snow, which can degrade their performance over time, making it difficult to identify antenna blockages due to gradual changes in signal levels.
Innovation Solution
A method and device for detecting blockages in frequency-modulated continuous-wave (FMCW) radar systems by transmitting a first object detection signal and a second frequency offset signal, with a controller identifying blocking patterns in the received signal, even in the presence of high pass filtering, to ensure quick and accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional radar signal processing is used, then object detection function is maintained, but blockage detection capability is lost due to gradual signal level changes
Solution Approach 1:
The radar signal is segmented into two distinct components: a first signal for object detection and a second signal for blockage detection. This segmentation allows each signal to be optimized for its specific purpose, with the second signal specifically designed to detect blockages by comparing its received level against a threshold, thereby resolving the contradiction between maintaining object detection reliability and achieving precise blockage detection.
Solution Approach 2:
A threshold value serves as an intermediary reference for comparing the received level of the second signal. This threshold acts as a mediator between the transmitted and received second signals, enabling reliable blockage detection by providing a clear decision boundary that overcomes the difficulty of detecting gradual signal level changes in conventional radar processing.
2Measurement precision
If a second frequency offset signal is transmitted for blockage detection, then blockage detection precision is improved, but device complexity increases
Solution Approach 1:
The second signal with frequency offset serves multiple functions: it enables blockage detection while its processing integrates with the existing radar signal processing chain. The frequency offset property allows the second signal to be distinguished from the first signal during processing, achieving precise blockage detection without requiring completely separate processing hardware, thus improving precision while limiting complexity increase.
Solution Approach 2:
The second signal is designed with a specific frequency offset parameter that distinguishes it from the first object detection signal. This parameter change enables the receiver to separate and process the second signal specifically for blockage detection purposes. By changing only the frequency parameter rather than the entire signal structure, the invention achieves improved blockage detection precision while minimizing the increase in device 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
Enables precise and rapid detection of blockages, improving the reliability of radar systems by using known blocking patterns and sideband frequencies that propagate through existing signal processing paths, enhancing performance even in adverse environmental conditions.
Implementation Method 1
detecting blockage of a radar device, and particularly to detecting blockage of a frequency-modulated continuous-wave, FMCW, radar device
Implementation Method 2
transmitting a first signal being a first transmission signal, the first signal comprising an object detection signal
Data Source
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AI summary
There is provided detection of blocking of a frequency-modulated continuous-wave, FMCW, radar device. A first signal being a first transmission signal comprising an object detection signal is transmitted. A a second signal being a frequency offset signal relative the first signal is transmitted. A reception signal comprising at least a received version of the second signal is received. Blocking of the FMCW radar device is determined by identifying a blocking pattern in the received version of the second reception signal.