In-Vehicle Radar Time Slot Allocation for Interference Reduction
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Solution Overview
Problem
The increasing mutual interference between in-vehicle millimeter wave radars in advanced driving assistance systems (ADAS) reduces detection probability and increases false alarm probability, impacting driving safety and comfort.
Innovation Solution
A radar signal sending method that determines specific time domain ranges for each radar detection apparatus, ensuring that the absolute difference between time domain start locations of overlapping ranges falls within thresholds based on echo and propagation delays, preventing interference by ensuring only one radar signal is processed by each apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple in-vehicle millimeter wave radars are deployed for comprehensive detection coverage, then detection capability and safety are improved, but mutual interference between radars increases
Solution Approach 1:
The patent segments the time domain into multiple non-overlapping ranges, assigning each radar detection apparatus a specific time slot for signal transmission. This temporal segmentation prevents multiple radars from transmitting simultaneously, thereby eliminating mutual interference while maintaining comprehensive detection coverage through coordinated operation across different time slots.
Solution Approach 2:
The patent implements periodic time-domain segmentation where radars transmit signals in alternating periodic time slots. Each radar transmits during its assigned period and remains silent during other periods, creating a periodic transmission pattern that prevents interference while ensuring continuous monitoring capability across all time periods.
2Reliability
If radars transmit continuously for high detection probability, then detection reliability is improved, but interference with other radars increases
Solution Approach 1:
The patent employs periodic time-slot allocation where each radar transmits continuously during its assigned time slot and remains silent during other slots. This periodic transmission pattern ensures high detection probability within each radar's active period while preventing interference with other radars during their respective transmission periods.
Solution Approach 2:
The patent segments the continuous time domain into discrete non-overlapping slots, assigning each radar a specific segment for transmission. This segmentation transforms continuous transmission into structured periodic transmission, maintaining high detection capability within each segment while eliminating inter-radar interference through temporal separation.
3Object-generated harmful factors
If time domain ranges are completely non-overlapping to avoid interference, then interference is reduced, but time resource utilization decreases
Solution Approach 1:
The patent segments the time domain into multiple non-overlapping ranges for different radars, ensuring complete temporal separation to eliminate interference. While this prevents overlapping transmissions, the systematic segmentation allows for efficient coordination and maximizes time resource utilization within the constraints of interference-free operation.
Data Source
AI summary
A radar signal sending method and a device provides for the sending of the radar signal to cooperative radars. A first time domain range in L time domain ranges is determined. A first radar signal is sent in the first time domain range. Any one of the L time domain ranges partially overlaps at least one of the other (L−1) time domain ranges, and an absolute value of a difference between time domain start locations of any two of the L time domain ranges is greater than or equal to a first threshold and less than or equal to a second threshold.