Radar Speed Estimation Using Azimuth-Based Point Selection
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Solution Overview
Problem
Existing radar-based systems for estimating the traveling speed of a moving object often suffer from inaccuracies due to reflections from stationary objects, leading to decreased accuracy in speed estimation.
Innovation Solution
A traveling speed estimation device that includes an information acquisition unit to gather observation point information, a selection unit to select relevant data points, and an estimation unit to calculate the true speed based on relative speed and azimuth angles, while excluding data from stationary objects and large angular deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar waves are used to estimate the traveling speed of a moving object by reflecting off stationary objects, then the speed can be estimated, but the accuracy of the speed estimation decreases
Solution Approach 1:
The patent extracts and removes erroneous observation point information items from the dataset. By identifying and excluding data points that cause estimation errors (such as reflections from stationary objects or data with large azimuth angle deviations), the system maintains measurement precision while improving reliability.
Solution Approach 2:
The patent implements a feedback mechanism where the estimation unit uses the true value of traveling speed (when available) to evaluate and select observation point information items. This feedback loop allows the system to iteratively improve accuracy by learning from previous estimation results and adjusting the selection criteria for valid data points.
2Quantity of substance
If all observation point information items are used for speed estimation, then more data is available, but erroneous data points reduce estimation accuracy
Solution Approach 1:
The patent selectively extracts only the valid observation point information items that contribute to accurate speed estimation. By removing erroneous data points while retaining useful information, the system maintains an adequate quantity of valid data for estimation while preventing accuracy degradation from contaminated data.
Solution Approach 2:
The patent applies different quality criteria to different observation point information items based on their specific characteristics (such as azimuth angle, relative speed, and reliability). Each data point is evaluated individually against specific criteria, allowing the system to maximize the quality of included data while maintaining sufficient quantity for accurate estimation.
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
Improves the accuracy of traveling speed estimation by reducing the influence of erroneous data points, thereby providing a more precise speed estimation for moving objects.
Implementation Method 1
a radar device mounted on a moving object and transmitting and receiving radar waves
Data Source
AI summary
A traveling speed estimation device includes an information acquisition unit, a selection unit, and an estimation unit. The information acquisition unit repeatedly acquires, from a radar device mounted on a moving object and transmitting and receiving radar waves, observation point information items including at least an observation point relative speed, which is a relative speed between an observation point that reflects the radar wave and the radar device, and an observation point azimuth angle, which is an azimuth angle at which the observation point exists. The selection unit selects observation point information items from which a traveling speed of the moving object can be estimated that is closest to a true value from among a plurality of observation point information items. The estimation unit estimates the true value of the traveling speed based on the observation point relative speed and the observation point azimuth angle of one or more of the observation point information items selected by the selection unit.