Automotive Radar Passive Multistatic Processing for Cross-Interference
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Solution Overview
Problem
Cross-radar interference between autonomous vehicles' radar systems is exacerbated by the lack of effective solutions for the lack of effective solutions to mitigate the interference, which impacts the operation of radar systems and autonomous vehicles, particularly when vehicles are in close proximity and their radar systems are time-synchronized.
Innovation Solution
Implementing opportunistic passive multistatic radar processing by controlling radar systems to operate in active or passive modes based on interference likelihood, using server computing systems or vehicle-to-vehicle communication to manage mode transitions and sharing transmission information, thereby mitigating interference and enhancing radar perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radar systems of multiple autonomous vehicles operate in active mode simultaneously, then detection coverage and reliability are improved, but cross-radar interference increases
Solution Approach 1:
The radar system dynamically switches between active and passive modes based on detected interference conditions. When cross-radar interference is detected, the system transitions from active transmission to passive reception, adapting its operational state to environmental conditions while maintaining detection capability through multistatic processing of received signals
Solution Approach 2:
The radar system uses reflected signals from other vehicles' transmitters to perform detection when in passive mode. By leveraging transmission information from other autonomous vehicles and processing their reflected signals, the system provides self-service detection capability without requiring its own transmitter, thereby reducing interference while maintaining reliability
2Ease of operation
If radar systems are time-synchronized for fleet operation, then coordination and communication efficiency are improved, but instances of cross-radar interference increase
Solution Approach 1:
The radar system employs periodic switching between active and passive modes based on synchronized timing information from other fleet vehicles. By coordinating mode switching periods with fleet synchronization signals, the system maintains ease of fleet operation while creating temporal separation that reduces cross-radar interference through opportunistic passive processing windows
3Object-affected harmful factors
If the radar system operates in passive mode to reduce interference, then cross-radar interference is reduced, but active detection capability is limited
Solution Approach 1:
The radar receiver is designed to perform multiple functions: it can receive and process signals from the vehicle's own transmitter during active mode, and simultaneously receive and process reflected signals from other vehicles' transmitters during passive mode. This multi-functionality allows the system to reduce interference while maintaining detection capability through opportunistic use of external transmission sources
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 reduces cross-radar interference and enhances radar detection capabilities by leveraging passive mode operations and multistatic radar techniques, allowing vehicles to detect objects effectively without direct transmission, thus improving overall radar performance and vehicle navigation.
Implementation Method 1
A first transmitter of the first radar system of the first autonomous vehicle and a second transmitter of the second radar system of the second autonomous vehicle can both transmit radar signals into a driving environment
Implementation Method 2
a first receiver of the first radar system can receive, from the driving environment, a reflected radar signal responsive to the radar signal transmitted by the first transmitter
Data Source
AI summary
Various technologies described herein pertain to opportunistically employing passive multistatic radar processing in automotive radar systems. A radar system of an autonomous vehicle is controlled to operate in an active mode during a first time period as the autonomous vehicle travels along a route. A transmitter and receiver of the radar system are enabled in the active mode. The radar system is controlled to operate in a passive mode during a second time period as the autonomous vehicle travels along the route. The transmitter is disabled and receiver is enabled in the passive mode. While in the passive mode, the receiver of the radar system receives a reflected radar signal responsive to a radar signal transmitted by a differing radar system of a differing autonomous vehicle. An object is detected based on the reflected radar signal and transmission information pertaining to the differing radar system of the differing autonomous vehicle.