Vehicular Radar Interference Management via BSM Time Slots
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Solution Overview
Problem
Radar interference among onboard systems in modern vehicles leads to inaccurate environmental sensing, rendering Advanced Driver Assistance Systems (ADAS) non-functional and potentially dangerous due to the identification of ghost objects.
Innovation Solution
A method implemented by an onboard vehicle computer that observes the order of Basic Safety Messages (BSMs) received and broadcasted by DSRC-enabled vehicles, building a data structure to assign radar parameters in a distributed manner, allowing vehicles to operate on the same parameters without wireless confirmation, thus minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple vehicles execute onboard radar systems simultaneously, then environmental sensing coverage is improved, but radar interference increases causing inaccurate sensing
Solution Approach 1:
The patent implements periodic time-division multiplexing where radar systems in different vehicles are activated in alternating time slots. Each vehicle executes radar sensing only during its assigned time window, creating periodic action patterns that prevent simultaneous radar transmissions and eliminate interference while maintaining comprehensive environmental coverage across the vehicle cluster.
Solution Approach 2:
The patent segments the continuous radar operation of multiple vehicles into discrete, non-overlapping time intervals. By dividing the time domain into separate slots assigned to different vehicles, the system allows each vehicle to contribute to environmental sensing coverage without causing interference, thus segmenting the sensing function across both space and time dimensions.
2Quantity of substance
If radar systems operate simultaneously in clustered vehicles, then sensing redundancy is improved, but interference causes ghost object identification
Solution Approach 1:
The patent uses periodic time-division multiplexing to activate radar systems in different vehicles during separate time slots. This periodic activation pattern maintains sensing redundancy across the vehicle cluster while preventing simultaneous transmissions that cause interference and ghost object identification, as each vehicle's radar operates independently during its assigned window.
3Loss of energy
If vehicles use distributed parameter assignment without wireless confirmation, then communication overhead is reduced, but parameter synchronization complexity increases
Solution Approach 1:
The patent implements a self-service mechanism where each vehicle autonomously determines its radar parameters (such as time slots, frequencies, or codes) based on pre-established protocols and locally available information from BSMs. This self-assignment approach eliminates the need for complex wireless confirmation exchanges, reducing communication overhead while maintaining synchronization through protocol-based consensus.
Solution Approach 2:
The patent uses Basic Safety Messages (BSMs) as an intermediary carrier that conveys necessary identification and position information between vehicles. Rather than requiring direct confirmation exchanges for parameter assignment, the BSMs serve as a mediator that enables vehicles to independently determine appropriate radar parameters based on protocol rules, simplifying the synchronization process.
Data Source
AI summary
The disclosure includes embodiments for minimizing radar interference. In some embodiments, a method includes observing, for a time frame, an order in which Basic Safety Messages (“BSMs”) are received by a DSRC radio of the ego vehicle and broadcasted by the DSRC radio of the ego vehicle. In some embodiments, the method includes building a data structure that includes digital data that describes the order in which the BSMs were received and transmitted by the DSRC radio during the time frame. In some embodiments, the method includes assigning, by the onboard computer of the ego vehicle, radar parameters to the one or more other DSRC-enabled vehicles and the ego vehicle based on the order described by the digital data included in the data structure.