Cascaded Radar Frequency Offset Bumper Reflection Mitigation
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Solution Overview
Problem
Automotive radar systems face interference from vehicle structures like bumpers, leading to ghost targets and intermodulation products that degrade the accuracy of distance and speed measurements.
Innovation Solution
Implementing a frequency offset in the timing signal between leader and follower radar devices to convert bumper reflection signals into direct current offsets, which can be filtered out, thereby reducing the generation of intermodulation products and improving radar system accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar signals are transmitted and received to detect objects, then distance and speed measurements are obtained, but vehicle structures like bumpers reflect signals creating interference and ghost targets
Solution Approach 1:
The patent measures the frequency of bumper reflection signals and uses this harmful reflection information to generate a compensating frequency offset in the follower radar device. By converting the harmful reflection frequency into a useful calibration parameter, the system eliminates ghost targets while maintaining the benefit of using existing vehicle structures as reference points for synchronization
Solution Approach 2:
The patent changes the frequency parameter of the follower radar device by applying a frequency offset that is determined based on the measured bumper reflection frequency. This parameter change shifts the follower's operating frequency away from the problematic reflection frequencies, thereby eliminating intermodulation products and ghost targets while preserving measurement capabilities
2Measurement precision
If multiple radar devices are used in cascaded topology for high resolution imaging, then radar imaging resolution is improved, but synchronization and phase coherence become more complex
Solution Approach 1:
The patent implements a feedback mechanism where the follower radar device measures the frequency of its own bumper reflections and uses this measured information to automatically adjust its operating frequency through a frequency offset. This closed-loop feedback approach simplifies synchronization by allowing each device to self-calibrate based on its environmental reflections, reducing the complexity of manual phase coherence maintenance
Solution Approach 2:
Each radar device in the cascaded system performs self-synchronization by measuring its own bumper reflection frequency and applying the appropriate frequency offset independently. This self-service approach eliminates the need for complex external synchronization infrastructure, as each device autonomously maintains phase coherence with the leader device through its own measurements and adjustments
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 effectively minimizes the impact of bumper reflections, enhancing the radar system's performance by reducing false targets and improving the accuracy of distance and speed measurements.
Implementation Method 1
A radar system transmits an electromagnetic signal and receives back reflections of the transmitted signal. The time delay and/or time delay variation between the transmitted and received signals can be determined and used to calculate the distance and/or the speed of objects causing the reflections
Implementation Method 2
Implementing a frequency offset in the timing signal between leader and follower radar devices to convert bumper reflection signals into direct current offsets, which can be filtered out
Data Source
AI summary
A system and method for processing radar signals is presented. A first transmitted radar signal is transmitted by a first transmitter using a first local oscillator signal having a first frequency. The first transmitter is coupled to a structure of a vehicle. A first received radar signal is received using a first receiver. The first received radar signal is processed using a second local oscillator signal having a second frequency to generate a processed radar signal. The second frequency is offset from the first frequency by a predetermined offset value. An output signal is generated by executing a fast Fourier transform on the processed radar signal to generate a frequency-domain output signal.