Radar Sidewall Reflection Removal Circuit
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Solution Overview
Problem
Radar devices used for obstacle detection around vehicles face inaccuracies when operating on roads with sidewalls, as reflected radar waves from the sidewalls can lead to erroneous detection of obstacles due to multiple reflections, making it difficult to accurately detect objects near the front lateral side of the vehicle.
Innovation Solution
An object detection device with sidewall detection circuitry that determines the presence of a sidewall based on azimuth angles, distances, Doppler velocities, and reflection intensities, and uses multiple reflection position detection and exclusion range setting circuitry to remove multiple reflection components from radar signals, allowing for accurate object detection by the object detection circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radar operation is stopped on the front lateral side when a vehicle runs on a road having a sidewall, then the erroneous detection of obstacles is reduced, but the detection capability of obstacles near the front lateral side is degraded
Solution Approach 1:
The patent extracts and removes multiple reflection wave components from the radar signals by identifying them through specific detection circuitry and excluding them from further processing. This separates the harmful reflected signals from useful detection signals, allowing the radar to maintain operation while eliminating false detections caused by sidewall reflections
Solution Approach 2:
The patent introduces an intermediary processing stage between signal reception and obstacle detection. The multiple reflection position detection circuitry and detection exclusion range setting circuitry act as intermediaries that identify and filter out reflected signals before they can cause erroneous obstacle detections, thereby maintaining both reliability and detection capability
2Productivity
If the radar continues operation on the front lateral side when a vehicle runs on a road having a sidewall, then the detection capability of obstacles near the front lateral side is maintained, but erroneous detection of obstacles occurs due to multiple reflections
Solution Approach 1:
The patent converts the harmful multiple reflection waves into useful information by detecting their specific characteristics (azimuth angles, distances, Doppler velocities). The system identifies the presence and position of sidewalls through these reflected signals and uses this information to exclude them from obstacle detection, thereby transforming a source of error into a means of improving detection accuracy
3Measurement precision
If multiple reflection wave components are removed from radar signals, then the accuracy of obstacle detection is improved, but the complexity of the radar system increases
Solution Approach 1:
The patent performs preliminary detection and identification of multiple reflection wave components before the main obstacle detection process. By pre-identifying the azimuth angles, distances, and Doppler velocities of reflected signals and setting exclusion ranges in advance, the system simplifies the subsequent obstacle detection process and avoids the need for complex real-time analysis during normal operation
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 high-accuracy obstacle detection even when a vehicle is on a road with a sidewall by identifying and removing multiple reflection wave components, thereby improving the reliability of object detection around the vehicle.
Implementation Method 1
a radar device mounted in a vehicle... a transmission signal reflected by a plurality of objects... a plurality of Doppler velocities of a plurality of reflection signals
Implementation Method 2
a plurality of Doppler velocities of a plurality of reflection signals
Implementation Method 3
a transmission signal reflected by the plurality of objects, the transmission signal which is transmitted by the radar device mounted in the vehicle... multiple reflection position detection circuitry which, in operation, detects a plurality of multiple reflection wave components caused by the sidewall and the vehicle
Data Source
AI summary
An object detection device that detects an obstacle in an object by transmitting a signal by a transmission unit, and using reflection signals by a receiving unit, the device including: a sidewall detection circuit that determines whether the vehicle is running on a road having the sidewall, based on an azimuth angle of the object, a distance from the vehicle to the object, Doppler velocities of the reflection signals, and intensities of the reflection signals; a multiple reflection position detection circuit that detects multiple reflection wave components from the reflection signals, based on the Doppler velocities, the azimuth angle, and the reflection intensities when the road is determined to have the sidewall; a detection exclusion range setting circuit that removes the detected multiple reflection wave components from the reflection signals; and an object detection circuit that detects the object using the reflection signals with the multiple reflection wave components removed.