Radar Apparatus Predicting Vehicle Rear End Position
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Solution Overview
Problem
Radar systems face challenges in accurately deriving the position of a preceding vehicle's rear end portion when it is out of the transmission range, leading to inaccurate distance calculation and potential vehicle collisions.
Innovation Solution
The radar apparatus calculates a distance difference between the rear end portion and another portion of the vehicle within the transmission range, and predicts the rear end portion's position using this difference, even if the rear end portion's target information is not derived, thereby reducing processing load and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the radar apparatus uses the conventional method of deriving target information only from received reflection waves, then the processing load is reduced, but the measurement precision of the rear end portion position deteriorates when it is out of transmission range
Solution Approach 1:
The system performs preliminary association between the rear end portion and other vehicle portions when both are detectable. This pre-established relationship enables prediction of the rear end portion position even when it becomes undetectable, ensuring continuous accurate measurement without increasing real-time processing complexity
Solution Approach 2:
The system uses other detectable portions of the vehicle (such as the bottom portion) as intermediaries to indirectly determine the position of the rear end portion. By measuring the distance difference between the intermediary portion and the rear end portion, the system can predict the rear end position without directly detecting it
2Reliability
If the radar apparatus derives target information of the rear end portion directly, then the position accuracy is improved, but the reliability deteriorates when the rear end portion is out of transmission range
Solution Approach 1:
The system performs preliminary association between the rear end portion and other vehicle portions when both are detectable. This pre-established relationship enables prediction of the rear end portion position even when it becomes undetectable, ensuring continuous accurate measurement without increasing real-time processing complexity
Solution Approach 2:
The system creates a predictive copy of the rear end portion target information by using the distance difference relationship established from other detectable portions. This copied information maintains the same positional relationship patterns, ensuring reliable target information availability even when direct detection is impossible
3Measurement precision
If the radar apparatus processes target information from multiple portions of the vehicle, then the measurement precision is improved, but the processing load increases
Solution Approach 1:
The system performs preliminary association between the rear end portion and other vehicle portions when both are detectable. This pre-established relationship enables prediction of the rear end portion position even when it becomes undetectable, ensuring continuous accurate measurement without increasing real-time processing complexity
Solution Approach 2:
The system uses the detectable portions of the vehicle to serve the purpose of determining the rear end portion position. By calculating the distance difference between detectable portions and applying this difference to predict the rear end position, the system makes the detectable portions self-sufficient for determining all vehicle positions including undetectable ones
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 allows for accurate prediction and output of the rear end portion's target information, enhancing safety by preventing collisions and reducing processing load, especially at low host vehicle speeds.
Implementation Method 1
a radar apparatus transmits a transmission wave within a transmission range that is an outside of a vehicle, and then acquires target information of a target, such as a preceding vehicle, by receiving a reflection wave reflected by the target
Implementation Method 2
calculate a distance difference between the first target and the second target
Data Source
AI summary
A radar apparatus derives (i) first target information of a first target existing in the transmission range of the transmission wave, the first target being a rear end portion of a vehicle and (ii) second target information of a second target existing in the transmission range of the transmission wave, the second target being a portion of the vehicle other than the rear end portion of the vehicle. The radar apparatus calculates a distance difference between the first target and the second target, and predicts, in a case where the first target information of the first target derived in a previous target information derivation process is not derived in a latest target information derivation process, a position of the first target, using the distance difference and the second target information of the second target derived in the latest target information derivation process.