Vehicle Radar Interference Control via Diagonal Transmission Timing
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Solution Overview
Problem
Vehicle surroundings monitoring systems equipped with multiple radars face interference issues due to overlapping detection areas, leading to reduced accuracy and potential delays in detecting objects, particularly when radars with identical frequencies transmit waves simultaneously.
Innovation Solution
Implementing a transmission timing control mechanism that alternates the transmission periods and stop periods of radars disposed at diagonal corners, ensuring that transmission periods of first and second diagonal radars do not overlap, thereby preventing wave interference and reducing detection time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmission periods of all four radars are made mutually exclusive to prevent interference, then wave interference is eliminated, but the time required for completing radio wave transmission becomes relatively long
Solution Approach 1:
The four radars are divided into two groups: first diagonal radars (front right and rear left) and second diagonal radars (front left and rear right). Each group transmits radio waves in alternating periods, with the transmission period of one group being mutually exclusive to the transmission period of the other group. This segmentation allows for more efficient time management compared to making all four radars transmit mutually exclusively.
Solution Approach 2:
The radars transmit radio waves periodically with alternating transmission and stop periods. The transmission timing control unit coordinates the periodic transmission of the two groups of diagonal radars, ensuring that when one group is transmitting, the other group is in its stop period, and vice versa. This periodic action pattern prevents interference while maintaining efficient detection cycles.
2Adaptability or versatility
If detection angle ranges of radars are widened to reduce blind areas, then blind area coverage is improved, but detection areas of adjacent radars overlap more, increasing interference
Solution Approach 1:
By implementing periodic transmission with alternating periods for diagonal radars, the system allows each radar to have a wider detection angle range without causing interference. The transmission timing control unit ensures that radio waves from different radars do not overlap in time, even when their spatial detection areas overlap, thus resolving the contradiction between wide coverage and interference prevention.
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 enhances the accuracy of object detection by avoiding wave interference and shortening the time required for completing radio wave transmission, allowing for quicker and more reliable drive assist controls.
Implementation Method 1
Each of the radars transmits a radio wave and receives a reflected wave generated by an object reflecting the transmitted wave, to thereby detect a relative position, a relative speed, and the like of the object with respect to the own vehicle.
Implementation Method 2
receives a reflected wave generated by an object reflecting the transmitted wave
Implementation Method 3
In the overlapping areas X where two detection areas A overlap with each other, the radio waves transmitted by the radars interfere with each other
Data Source
AI summary
If a vehicle surroundings monitoring apparatus is equipped with four radars disposed at each of the four corners of the body of a vehicle in order to detect an object around the vehicle, the interfere of the radio waves of the radars likely to occur. As a result, the accuracy for detecting an object by the radars will deteriorate. Specifically, if two of detection areas are adjacent to each other of the radars overlaps with each other and the two of the radars transmits radio waves at the same time, the interfere of the radio waves will occur in the overlapping area. In view of this, the four radars are divided into two groups such that the detection areas of two radars within the group aren't adjacent to each other and transmission period of one of the groups and that of the other of the groups are repeated alternately.