Vehicle Radar Sub-Band Assignment for Interference Control
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Solution Overview
Problem
Existing vehicular radar systems experience interference due to uncoordinated transmission in the same frequency band, which affects the reliability and efficiency of radar operations.
Innovation Solution
A radar system with a control unit that divides a dedicated frequency band into sub-bands and assigns them to radar transceivers based on the vehicle's heading, using hysteresis to avoid unwanted toggling and interference, and employs non-overlapping or time-multiplexed sub-bands to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple radar transceivers transmit in the same frequency band uncoordinatedly, then the system complexity is reduced and ease of operation is improved, but interference between transceivers increases and reliability deteriorates
Solution Approach 1:
The patent changes the frequency parameter by dividing the dedicated frequency band into multiple sub-bands and dynamically assigning different sub-bands to different radar transceivers based on vehicle heading. This parameter change allows multiple transceivers to operate simultaneously without interference while maintaining ease of operation through automated control.
Solution Approach 2:
The patent implements dynamic sub-band assignment that adapts to changing vehicle heading. The control unit continuously monitors vehicle orientation and reassigns sub-bands accordingly, creating a dynamic interference avoidance mechanism that maintains reliability without requiring complex manual coordination.
2Reliability
If sub-bands are dynamically assigned based on vehicle heading, then interference is reduced and reliability is improved, but device complexity increases
Solution Approach 1:
The control unit serves multiple functions: it determines vehicle heading, manages sub-band division, assigns sub-bands to transceivers, and applies hysteresis logic. This multi-functionality consolidates complexity into a single control unit rather than requiring separate systems for each function.
Solution Approach 2:
The radar system automatically manages its own frequency allocation based on vehicle heading without external intervention. The control unit self-determines the optimal sub-band assignment and implements it autonomously, reducing the need for external coordination systems.
3Object-affected harmful factors
If sub-bands are assigned to radar transceivers based on heading intervals, then interference is reduced, but unwanted sub-band toggling occurs near border limits
Solution Approach 1:
The patent applies hysteresis as a cushioning mechanism near sub-band transition borders. When the vehicle heading approaches a border limit, the hysteresis mechanism prevents premature or oscillating sub-band switches by requiring the heading to cross the border by a certain margin, thereby stabilizing the sub-band assignment and preventing unwanted toggling.
4Object-affected harmful factors
If the dedicated frequency band is divided into non-overlapping sub-bands, then interference between transceivers is minimized, but the available frequency resources for each transceiver are reduced
Solution Approach 1:
The patent implements periodic reassignment of sub-bands as the vehicle heading changes. Each transceiver periodically receives a different sub-band assignment based on the current heading interval, allowing all transceivers to access the full frequency band over time while avoiding simultaneous interference through non-overlapping assignments at any given moment.
Data Source
Figure 1~2
Figure 3
Figure 4A~4F
AI summary
The present disclosure relates to a radar system (210) for a vehicle (200), comprising a plurality of radar transceivers (202, 203, 204, 205) and a control unit (208). Each radar transceiver (202, 203, 204, 205) is associated with a main pointing direction (PI, P2, P3, P4) and a certain frequency sub-band (A, B, C, D), where the subbands (A, B, C, D) together form a certain dedicated frequency band. The control unit (208) is adapted to: - define heading intervals which divide a full turn interval 0° - 360° into sections, - assign a corresponding sub-band (A, B, C, D) to each heading interval, - determine a present vehicle heading (F), and to - assign a corresponding sub-band (A, B, C, D) to each one of the radar transceivers (202, 203, 204, 205) in dependence of the heading interval that comprises the present vehicle heading (F).