UAV Microwave Radar Waveform Control for Interference Filtering
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Solution Overview
Problem
Conventional microwave radar anti-interference methods struggle to effectively filter out interference signals between multiple radars that are not time-synchronized, particularly those with frequencies lower than the maximum receiving frequency, which cannot be filtered out by existing filters.
Innovation Solution
The implementation of trapezoidal modulation waveforms with different fixed frequency delays in microwave radars, allowing for the identification and filtering of interference signals by comparing the frequency differences between the rising and falling edges of the intermediate frequency signals, and setting specific delay relationships to ensure interference signals are outside the filter bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional filter bandwidth control is used to filter interference signals, then interference outside the bandwidth can be filtered out, but interference signals with frequencies lower than the maximum receiving frequency cannot be filtered out
Solution Approach 1:
The patent changes the modulation waveform parameter from traditional triangular wave to trapezoidal wave, introducing a fixed frequency part with specific delay relationships. This parameter change creates distinct frequency characteristics that enable differentiation between target signals and interference signals, allowing effective filtering of low-frequency interference that conventional bandwidth control cannot reject
Solution Approach 2:
Instead of trying to broaden the filter bandwidth to include all possible target signals (which would let more interference in), the patent inverts the approach by using specific delay relationships in the trapezoidal waveform to create unique frequency signatures. This allows the system to identify and filter interference based on its frequency characteristics rather than relying solely on bandwidth control
2Productivity
If multiple microwave radars operate simultaneously, then radar coverage and detection capability are improved, but interference between radars increases
Solution Approach 1:
The patent applies local quality by introducing specific delay relationships only in the fixed frequency part of the trapezoidal waveform, while maintaining standard modulation characteristics in other parts. This localized modification creates distinctive frequency signatures for each radar without fundamentally changing the overall radar operation, enabling interference differentiation while maintaining detection capability
Solution Approach 2:
The patent uses periodic trapezoidal modulation waveforms with specific delay relationships in the fixed frequency part. This periodic action creates predictable, repeating frequency patterns that can be easily identified and differentiated from interference signals, allowing multiple radars to operate simultaneously with reduced mutual interference
3Object-generated harmful factors
If strict time synchronization is enforced between multiple radars, then interference can be controlled, but system complexity and synchronization requirements increase
Solution Approach 1:
The patent enables radars to self-identify interference signals through the unique frequency characteristics created by the trapezoidal waveform's fixed frequency part. Each radar can autonomously detect and filter interference based on frequency differentiation without requiring complex inter-radar communication or centralized synchronization control, thereby reducing 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 allows for effective filtering of interference signals, even when there is no fixed delay relationship between radars, improving the ability to distinguish between target and interference signals and simplifying the synchronization requirements for microwave radar systems.
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
The present disclosure provides a UAV control method. The method includes controlling an antenna device of a microwave radar of the UAV to transmit a microwave transmission signal and obtain a received signal, the microwave transmission signal and the received signal both being trapezoidal modulation waveforms, and one cycle of the trapezoidal modulation waveform including a frequency rising part, a frequency falling part, and a fixed frequency part; obtaining an intermediate frequency signal mixed by a frequency of the microwave transmission signal and the received signal to the radar controller, and determining whether the received signal is an interference signal based on the intermediate frequency signal; determining coordinate information of a detection target corresponding to the received signal if the received signal is not the interference signal; and updating a trajectory of the UAV based on the coordinate information of the detection target.