Radar Object Detection Velocity Comparison
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Solution Overview
Problem
Conventional object detection devices cannot accurately determine whether a target is a static object when a moving object and a static object have equal relative distances and equal angles of incidence.
Innovation Solution
The object detection device processes wave data from a radar device to estimate the relative distance, angle of incidence, and velocities between the radar device and the target, allowing it to differentiate between moving and static objects by comparing first and second relative velocities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional object detection devices use multipath environment model and non-multipath environment model to determine whether a target is static, then the determination can be made based on relative distance and angle of incidence differences, but it becomes impossible to correctly determine when a moving object and static object have equal relative distances and equal angles of incidence
Solution Approach 1:
The patent introduces a new dimension of measurement by incorporating relative velocity information in addition to the existing relative distance and angle of incidence parameters. By estimating the relative velocity between the radar device and the target, and comparing it with the moving velocity of the radar device, the system can determine whether a target is static even when multiple targets share the same distance and angle characteristics. This dimensional expansion resolves the ambiguity in distinguishing moving objects from static objects in previously indistinguishable scenarios.
2Measurement precision
If the observation time period is extended to improve velocity resolution, then the measurement precision of relative velocity increases, but the time required for object determination increases
Solution Approach 1:
The patent changes the observation time period dynamically based on the velocity resolution requirements and the moving velocity of the radar device. By adjusting the observation time period parameter, the system optimizes the balance between velocity measurement precision and determination speed. The processing circuitry is configured to set the observation time period such that velocity resolution is less than the average moving velocity of moving objects, achieving sufficient precision without excessive time consumption.
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 accurate determination of static objects even in cases where moving and static objects have equal relative distances and angles of incidence, improving the accuracy of object detection.
Implementation Method 1
vehicle-mounted radar devices emits an electric wave, e.g., a millimeter wave, to outside a vehicle, receive a reflected wave of the electric wave, the reflected wave being reflected by a target present outside the vehicle
Implementation Method 2
receive a reflected wave of the electric wave, the reflected wave being reflected by a target
Implementation Method 3
estimate a first relative velocity between the radar device and the target by using the wave data; and estimate a second relative velocity between the radar device and the target in a case where the target is a static object
Data Source
AI summary
An object detection device includes processing circuitry configured to acquire wave data; acquire the moving velocity of a radar device; estimate a relative distance between the radar device and a target, angle of incidence of a reflection signal from the target, and a first relative velocity between the radar device and the target, by using the wave data; and estimate a second relative velocity between the radar device and the target in a case where the target is a static object, on the basis of the acquired moving velocity and the relative distance and the angle of incidence, and determine whether the target is a static object by comparing the first relative velocity and the second relative velocity.