Microwave Radar Interference Filtering With Trapezoidal Waveforms
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Solution Overview
Problem
Existing microwave radar systems face challenges in effectively filtering out interference signals between multiple radars, particularly when time synchronization is not possible, leading to interference within the useful signal bandwidth.
Innovation Solution
The implementation of a microwave radar system that uses trapezoidal modulation waveforms, allowing for the transmission and reception of signals with a frequency rising part, a frequency falling part, and a fixed frequency part. This system determines whether received signals are interference based on intermediate frequency signals and updates UAV trajectories accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time synchronization is implemented between multiple microwave radars, then interference signals can be filtered out effectively, but system complexity and synchronization requirements increase
Solution Approach 1:
The patent changes the waveform parameter from traditional triangular wave to trapezoidal wave with a fixed frequency platform section. This parameter change allows the radar to identify and filter interference signals based on the unique characteristics of the trapezoidal waveform's fixed frequency section, eliminating the need for complex time synchronization systems while maintaining effective interference filtering
Solution Approach 2:
The fixed frequency platform section of the trapezoidal waveform acts as an intermediary characteristic that enables interference signal identification without requiring time synchronization. The platform section provides a distinct frequency signature that allows the radar to differentiate between target echoes and interference signals from other radars
2Device complexity
If traditional triangular wave modulation is used, then the radar system is simpler, but interference signals from other radars cannot be effectively distinguished from target signals
Solution Approach 1:
The patent modifies the modulation waveform parameters by introducing a fixed frequency platform section in the middle of the frequency sweep. This creates a distinctive frequency-time signature that allows the radar to identify interference signals from other radars and distinguish them from legitimate target echoes, thereby improving target detection accuracy without significantly increasing system complexity
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 enables effective filtering of interference signals without the need for time synchronization between multiple microwave radars, improving the accuracy of UAV navigation and target detection.
Implementation Method 1
an antenna device to transmit microwave signals and/or obtain received signals
Implementation Method 2
obtain an intermediate frequency signal mixed by a frequency of the microwave transmission signal and the received signal
Data Source
AI summary
A microwave radar includes an antenna device and a radar controller in communication with the antenna device, and configured to: control the antenna device to transmit a microwave transmission signal and obtain a received signal, obtain an intermediate frequency signal mixed by a frequency of the microwave transmission signal and the received signal to the radar controller, and determine whether the received signal is an interference signal based on the intermediate frequency signal, including: determining change information of a signal frequency and a signal amplitude of the intermediate frequency signal based on the intermediate frequency signal, and determining whether the received signal is the interference signal based on the change information of the signal frequency and the signal amplitude of the intermediate frequency signal. The microwave transmission signal and the received signal both are trapezoidal modulation waveforms.