Vehicle Radar Position Detection Using Speed Ratio Projection
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Solution Overview
Problem
Existing radar systems require significant workload and memory to store reference data for estimating the height of reflecting objects, increasing the complexity of implementing position detection functions.
Innovation Solution
A position detecting apparatus that uses a radar apparatus mounted on a vehicle to calculate the position of objects by determining the speed ratio and projection distance based on radar wave reflections, eliminating the need for pre-measured reference data by using a microcomputer to process radar and vehicle speed information, and calculating the height of objects using approximation curves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pre-measured reference data is used for estimating object height, then measurement precision is improved, but device complexity and memory requirements increase
Solution Approach 1:
The radar apparatus performs self-calibration by using the mobile body's own travel information (speed and position) to calculate reference values for object height estimation. The system generates its own reference data dynamically through the projection distance calculation unit, which computes expected radar cross-section values based on the relationship between relative speed, distance, and object height, eliminating the need for external pre-measured reference data storage
Solution Approach 2:
The system transforms the approach from storing static reference data to dynamically calculating reference values based on changing parameters (relative speed, distance, and angle of arrival). The calculation unit generates speed ratio information and projection distance values that adapt to real-time operating conditions, replacing the need for extensive pre-measured reference databases
2Measurement precision
If pre-measured reference data is stored for position detection, then measurement precision is improved, but loss of substance (memory resources) increases
Solution Approach 1:
The radar apparatus generates its own reference data on-demand using the projection distance calculation unit, which computes expected radar cross-section values based on the mobile body's travel information and geometric relationships. This eliminates the need to store large amounts of pre-measured reference data in memory, as the system calculates reference values dynamically during operation
Solution Approach 2:
The patent replaces the mechanical approach of storing physical reference data in memory with a computational approach that generates reference values through mathematical calculations. The calculation unit uses the relationship between relative speed, distance, and angle of arrival to compute projection distances and expected radar cross-sections, substituting memory storage with real-time computation
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
Reduces the workload and memory requirements for position detection, improves calculation accuracy, and enhances collision avoidance reliability by accurately determining the position of reflecting objects without pre-measured reference data.
Implementation Method 1
a radar apparatus, mounted on a mobile body, transmits radar waves towards outside the mobile body and receives reflected waves of the radar waves
Implementation Method 2
receives reflected waves of the radar waves
Data Source
AI summary
The position detecting apparatus repeatedly acquires, from a radar apparatus, object information including at least an object distance as a distance between the radar apparatus and a reflecting object and a relative speed between the radar apparatus and a reflecting object. The position detecting apparatus calculates a speed ratio as a ratio between the relative speed and the travelling speed. The position detecting apparatus calculates, based on the speed ratio, a projection distance between a projected position of the reflecting object projected onto a projection plane and a position of the radar apparatus on the projection plane, the projection plane having a predetermined angle with respect to a center axis indicating a direction along which the radar waves are transmitted by the radar apparatus and including the radar apparatus. The position detection apparatus calculates the position of the reflecting object based on the calculated projection distance.