Radar Interference Detection via Dual Signal Path Architecture
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Solution Overview
Problem
Radar systems in automotive applications face interference issues due to multiple devices operating in the same frequency range, leading to increased noise floors and difficulty in detecting objects, potentially causing ghost targets.
Innovation Solution
A method and system that utilize a dual signal path in radar systems, where one path processes reflected radar signals and another path measures interfering signals by sweeping the local oscillator frequency and detecting power across a wide bandwidth, allowing for the identification of interference and selection of non-interfering frequency ranges for operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radar devices operate in the same frequency range, then radar coverage and detection capability are improved, but interference between devices increases and noise floor rises
Solution Approach 1:
The system performs preliminary interference detection by sweeping the local oscillator frequency across a wide bandwidth before normal radar operation to identify interfering signals from other radar devices, allowing the system to select operating frequencies that avoid interference
Solution Approach 2:
The system dynamically changes the local oscillator frequency parameter during the detection phase to sweep across different frequency bands, enabling identification of interfering signals and selection of optimal operating frequencies that minimize interference while maintaining radar coverage
2Measurement precision
If a wide bandwidth is used to detect interfering signals, then interference detection capability is improved, but signal processing complexity increases
Solution Approach 1:
The system segments the wide frequency bandwidth into multiple frequency bands and processes each band separately using the dual signal path architecture, where the first path handles reflected radar signals and the second path measures interfering signals, reducing the complexity of processing the entire wide bandwidth at once
Solution Approach 2:
The local oscillator serves as an intermediary that is swept across different frequencies to downconvert both reflected radar signals and interfering signals to a common intermediate frequency, allowing the receiver to detect interfering signals across a wide bandwidth through frequency translation rather than direct wideband processing
3Measurement precision
If the transmitter is deactivated to measure interfering signals, then interference measurement accuracy is improved, but radar operation time is reduced
Solution Approach 1:
The system employs periodic action by alternating between transmission phases (where the transmitter is active and reflected radar signals are received) and detection phases (where the transmitter is deactivated and interfering signals are measured), allowing both radar operation and interference detection to be performed in alternating time slots
Solution Approach 2:
The system maintains continuity of useful action by continuously sweeping the local oscillator frequency across the bandwidth during detection phases and continuously transmitting radar signals during transmission phases, ensuring that both interference detection and radar coverage functions are continuously performed over time through the periodic alternation
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
Enables quick detection of interfering signals and efficient selection of operating frequencies, maintaining high radar performance by avoiding interference, thus enhancing safety in automotive radar and collision avoidance systems.
Implementation Method 1
a downconverter having a first input configured to be coupled to a radar antenna and a second input configured to receive a local oscillator (LO) signal
Data Source
AI summary
In accordance with an embodiment, a method of operating a radar system includes activating a transmitter to transmit a radar signal during a first time period, receiving a reflection of the radar signal from a radar antenna, downconverting the reflected radar signal, and digitally processing the downconverted reflected radar signal within a first frequency bandwidth using a first signal path. The method also includes deactivating the transmitter during a second time period, receiving a second signal from the radar antenna during the second time period, downconverting the second signal, measuring a power of the downconverted second signal within a second frequency bandwidth using a second signal path different from the first signal path, and determining an interference metric based on measuring the power.