Automotive Radar Interference Mitigation via Random Jitter
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Solution Overview
Problem
Automotive radar systems face interference issues due to multiple sensors operating on the same vehicle or nearby, which degrades detection performance and can lead to false target identification and hazardous false track indications.
Innovation Solution
The implementation of an automotive radar system with waveform generators that control transmitted signals to include random inter-pulse jitter, alternating ramp directions, and intra-pulse jitter, reducing interference by distinguishing true reflections from false targets and spreading false targets in range and Doppler velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radar sensors operate on the same vehicle, then the radar system can detect objects in multiple regions, but interference between sensors degrades detection performance
Solution Approach 1:
The patent applies parameter changes by introducing random variations in pulse separation time and frequency range for different radar sensors. Specifically, each sensor uses different statistical parameters for pulse timing and frequency modulation, which transforms the identical waveform parameters into differentiated parameters across sensors, thereby reducing mutual interference while maintaining multi-region coverage
Solution Approach 2:
The patent implements asymmetry by assigning different waveform characteristics to different sensors. Instead of using identical pulse repetition intervals and frequency ranges across all sensors, each sensor employs asymmetric parameters such as different mean pulse separation times and different frequency sweep ranges, creating distinguishable signal patterns that reduce interference
2Ease of operation
If radar sensors use fixed pulse separation time and frequency range, then the system operation is simple, but interference from other sensors causes false target identification
Solution Approach 1:
The patent applies dynamics by transitioning from fixed, static waveform parameters to dynamic, randomly varying parameters. The pulse separation time and frequency range are no longer constant but change randomly according to specified statistical distributions, making the waveform adaptive and time-variant, which helps distinguish true targets from interference while maintaining operational simplicity through automated randomization
3Reliability
If random jitter is introduced in pulse separation time and frequency range, then interference is reduced, but waveform generation complexity increases
Solution Approach 1:
The patent implements self-service by using automated random number generation and statistical distribution functions within the waveform generator. The system self-adjusts pulse separation time and frequency range based on pre-defined statistical parameters without requiring manual configuration or complex external control, reducing waveform generation complexity while maintaining interference reduction benefits
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
Substantially reduces interference effects, preventing false targets from forming tracks and improving radar system performance by accurately identifying true targets and reducing false indications.
Implementation Method 1
at least one first signal transmitter for transmitting a first type of transmitted signal into a region
Implementation Method 2
a receiver for receiving a reflected signal generated by reflection of the transmitted signal from an object
Data Source
AI summary
A system and method for mitigating interference in a frequency-modulated continuous-wave radar processing system is defined. Random inter-pulse jitter is implemented in a transmitted radar signal to prevent identification of false tracks due to interfering radar signals. Random intra-pulse jitter of time and/or frequency is implanted to create spreading of false targets and provide a method to distinguish false targets from true targets. Adjacent sensors in a multi-sensor radar system are alternatingly configured to transmit either upward ramping or downward ramping frequencies to mitigate interference between adjacent sensors in the same radar system.