Radar Sensor Precipitation Detection via Object Peak Filtering
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Solution Overview
Problem
Conventional radar sensor systems for motor vehicles struggle to reliably detect precipitation due to interference from genuine objects, leading to inaccurate integration of locating signals and reduced functionality in the presence of rain or spray.
Innovation Solution
A filtering procedure is applied to the locating signal to suppress peaks caused by objects, allowing only background noise and rain clutter to be integrated, with a detection threshold determined through noise estimation to differentiate between object peaks and noise background, thereby enhancing the method's robustness and independence from modulation ramp parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the locating signal is integrated across a distance range to detect precipitation, then the detection sensitivity to rain clutter is improved, but the measurement accuracy deteriorates due to interference from genuine objects such as preceding vehicles
Solution Approach 1:
The patent extracts and removes the harmful interference components (genuine object peaks) from the locating signal before integration. By applying a filtering procedure that identifies and suppresses peaks caused by genuine objects like preceding vehicles, the method isolates only the rain clutter components for integration, thereby resolving the contradiction between detection sensitivity and measurement accuracy
Solution Approach 2:
The patent introduces a filtering procedure as an intermediary step between signal reception and integration. This mediator selectively processes the locating signal by suppressing genuine object peaks while preserving rain clutter signals, enabling accurate precipitation detection without interference from other objects in the distance range
2Measurement precision
If the radar sensor system operates in precipitation conditions, then the detection of rain clutter is improved, but the range and locating depth are reduced due to signal reflection by raindrops and spray
Solution Approach 1:
The patent segments the locating signal into different distance ranges, specifically integrating only across a defined distance range that captures rain clutter while excluding distant genuine objects. This segmentation allows the system to maintain precipitation detection capability while mitigating the overall signal attenuation effect on locating depth
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
This approach enables more reliable detection of precipitation, even in scenarios with genuine objects present, by isolating rain clutter and noise levels, ensuring accurate integration and improved radar sensor functionality.
Implementation Method 1
Precipitation in the form of rain or spray splashed up from the road may reflect a portion of the emitted radar beam
Implementation Method 2
the frequency of the mixed product is thus a function of the signal transit time and accordingly the distance of the object but also of the relative velocity of the reflecting object due to the Doppler Effect
Data Source
AI summary
A method for detecting precipitation using a radar sensor system for motor vehicles designed for locating objects in the surroundings of the vehicle, in which method a locating signal that is a measure of the received power density as a function of the distance is integrated across a specific distance range lying below a limit distance for detecting precipitation. The locating signal is subjected to a filtering procedure before being integrated, the filtering procedure suppressing the peaks caused by located objects so that the filtered signal forms a measure of the noise level as a function of the distance.