Discontinuous Radar Transmission for Chirp Interference Mitigation
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Solution Overview
Problem
Radar systems experience interference due to frequency chirps crossing or coming close to each other, leading to a raised noise floor that reduces range and accuracy, and existing interference suppression methods are inadequate.
Innovation Solution
A method for suppressing interference by transmitting radar signals, monitoring adjacent frequencies for interference, pausing transmission during a calculated cross-over time duration, and resuming transmission when interference is no longer present, using techniques such as filtering, wavelet or Fourier transforming, and predicting missing signal sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar signals are transmitted continuously, then radar system productivity is maintained, but interference from other radars raises the noise floor and reduces measurement precision
Solution Approach 1:
The radar transceiver implements periodic transmission with intentional pauses. The method monitors adjacent frequencies and pauses transmission during detected interference events, creating a periodic on-off pattern that avoids continuous transmission while maintaining operational effectiveness. This resolves the contradiction by making transmission periodic rather than continuous, reducing interference exposure while preserving radar functionality.
Solution Approach 2:
The radar system performs preliminary monitoring of adjacent frequencies before transmitting radar signals. By detecting interference in advance through frequency monitoring and estimating cross-over time duration, the system can preemptively pause transmission to avoid interference. This preliminary detection and preparation action prevents interference before it degrades measurement precision.
2Measurement precision
If radar transmission is paused during interference, then measurement precision is improved, but transmission time is lost and productivity decreases
Solution Approach 1:
The radar system estimates the cross-over time duration of interference and pauses transmission only for the minimum necessary period to skip through the interference event. By calculating when interference will cease and resuming transmission immediately afterward, the system rushes through the interference period efficiently, minimizing time loss while ensuring measurement precision during critical data collection periods.
Solution Approach 2:
The transmission pause duration is dynamically adjusted based on real-time interference characteristics. The system monitors adjacent frequencies, detects interference onset and cessation, and adapts the pause length to match the actual interference duration. This dynamic approach ensures pauses are neither too long (wasting time) nor too short (failing to protect precision), optimizing the trade-off adaptively.
3Difficulty of detecting and measuring
If frequency monitoring is performed to detect interference, then interference detection capability is improved, but device complexity increases
Solution Approach 1:
The radar system replaces complex physical interference mitigation hardware with signal processing and computational methods. Instead of adding physical filters or shielding, the system uses software-based frequency monitoring, Fourier transforming, wavelet transforming, and filtering algorithms to detect and respond to interference. This substitution reduces hardware complexity while maintaining or improving detection capability.
Solution Approach 2:
The radar transceiver performs self-monitoring of adjacent frequencies and self-adjustment of transmission based on detected interference conditions. The system autonomously detects interference, estimates cross-over time duration, and pauses/resumes transmission without external control or complex coordinated systems. This self-service approach simplifies the overall device architecture by eliminating the need for additional control systems or inter-radar communication infrastructure.
Data Source
AI summary
A radar transceiver (400) including a transmit branch (450, 455, TX) arranged to transmit a radar signal at a frequency F(t), and a receive branch (RX, 405, 410, 420, 430, 460) arranged to receive a radar signal, wherein the receive branch comprises an interference monitoring circuit (430) configured to monitor frequencies adjacent to the frequency F(t) for interference, and to generate a control signal (440) if interference is detected at the adjacent frequencies, wherein the transmit branch is arranged to be paused in response to the control signal (440).