Microwave Radar Interference Detection Using Trapezoidal Modulation
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Solution Overview
Problem
Existing microwave radar systems face challenges in effectively filtering out interference signals from other radars, particularly those with frequencies lower than the maximum receiving frequency, due to the difficulty in synchronizing signal transmission times and the limitations of conventional anti-interference methods.
Innovation Solution
The implementation of a microwave radar system that uses trapezoidal modulation waveforms with a fixed frequency delay, allowing the radar controller to determine whether received signals are interference based on frequency differences and amplitude changes, and automatically setting delays to distinguish between echo and interference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional triangular-wave modulation is used with filter-based anti-interference, then interference filtering is possible, but time synchronization between multiple radars is required which increases system complexity
Solution Approach 1:
The patent changes the modulation waveform from triangular-wave to trapezoidal-wave, introducing a fixed frequency delay segment. This parameter change in the waveform structure enables interference signals to have distinct frequency characteristics without requiring time synchronization between radars
Solution Approach 2:
The patent extracts the frequency delay characteristic from the modulation waveform itself, rather than relying on external time synchronization mechanisms. The fixed frequency delay segment is extracted as a key feature that enables interference identification
2Measurement precision
If triangular-wave modulation is used, then echo signals can be detected, but interference signals with frequency below maximum receiving frequency cannot be filtered out
Solution Approach 1:
The patent modifies the frequency characteristics of the modulation waveform by introducing a fixed frequency delay segment in the trapezoidal-wave, creating distinct frequency signatures for echo versus interference signals that enable differentiation without losing low-frequency echo detection capability
Solution Approach 2:
The fixed frequency delay segment acts as an intermediary feature that mediates between echo signals and interference signals, creating a frequency characteristic gap that allows the radar to distinguish between them using frequency comparison
3Ease of operation
If trapezoidal modulation with fixed frequency delay is used, then interference identification is simplified, but modulation waveform complexity increases
Solution Approach 1:
The trapezoidal modulation waveform is self-identifying through its fixed frequency delay characteristic. The radar controller can identify interference signals by comparing frequency characteristics without requiring complex external synchronization systems, as the waveform itself carries the identification information
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 simplifies the process of identifying and filtering out interference signals without the need for precise time synchronization, effectively addressing the limitations of conventional methods and improving the radar's ability to distinguish between echo and interference signals.
Implementation Method 1
an antenna device configured to transmit a microwave transmission signal and/or obtain a received signal
Implementation Method 2
the antenna device being configured to send an intermediate frequency signal mixed by a frequency of the microwave transmission signal and the received signal
Data Source
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AI summary
The present disclosure provides a microwave radar and an unmanned aerial vehicle. The microwave radar includes an antenna device configured to transmit a microwave transmission signal and/or 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; and a radar controller in communication connection with the antenna device, the antenna device being configured to send an intermediate frequency signal mixed by a frequency of the microwave transmission signal and the received signal to the radar controller, and the radar controller being configured to determine whether the received signal is an interference signal based on the intermediate frequency signal. By using the technical solution of the present disclosure, there is no need to artificially strictly control the time of each microwave radar transmits signal, the implementation is simpler and convenient, and the application range is wide.