UAV Detection via GPS Leakage Signal Harmonics
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Solution Overview
Problem
Detecting small unmanned aerial vehicles (UAVs) is challenging due to the need for sensitive radar systems to distinguish them from other moving objects like swaying trees and flying birds, and differentiating between fixed-wing and quadcopter UAVs.
Innovation Solution
A method and system utilizing GPS leakage signals generated by UAVs, specifically detecting harmonic frequency signals such as second and third harmonic frequencies using a circular cylindrical active array (CCAA) antenna to identify and display information about detected UAVs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a radar system is used to detect small UAVs, then detection capability is improved, but it becomes difficult to distinguish UAVs from other moving objects like trees and birds
Solution Approach 1:
The patent uses GPS leakage signals as an intermediary characteristic to distinguish UAVs from other moving objects. Instead of relying solely on radar cross-section which is similar for all small moving objects, the system detects the unique GPS signal emissions from UAVs, providing a reliable differentiation mechanism that resolves the contradiction between detection capability and target distinction accuracy
Solution Approach 2:
The patent detects the unique 'electromagnetic color' or frequency signature of GPS leakage signals emitted by UAVs. By identifying signals at specific GPS frequencies (L1: 1575.42 MHz, L2: 1227.60 MHz, L5: 1176.45 MHz), the system can distinguish UAVs from other objects that may have similar radar reflectivity but different electromagnetic emissions
2Measurement precision
If radar sensitivity is increased to detect small UAVs, then detection range is improved, but false detection from other moving objects increases
Solution Approach 1:
The GPS leakage signal serves as a mediator that confirms true UAV detection. The system first identifies potential targets using radar, then verifies them by detecting the presence of GPS signals at characteristic frequencies, thereby reducing false detections from trees and birds that do not emit GPS signals
Solution Approach 2:
The system uses feedback from GPS signal detection to confirm or reject radar detections. When radar detects a potential UAV, the system checks for corresponding GPS leakage signals; if GPS signals are present at the expected frequencies, the detection is confirmed as true, otherwise it is rejected as false alarm
3Reliability
If GPS leakage signal detection is used to identify UAVs, then target distinction accuracy is improved, but detection system complexity increases
Solution Approach 1:
The radar system is designed to perform multiple functions: traditional radar detection and GPS leakage signal detection. By integrating GPS frequency reception capabilities into the existing radar infrastructure, the system achieves enhanced UAV identification without requiring completely separate detection systems, thereby limiting the increase in 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
Accurately detects UAVs within a radar range, differentiating them from other moving objects and various types of UAVs, enhancing detection capabilities.
Implementation Method 1
receiving a radio signal from air
Implementation Method 2
detecting a global positioning system (GPS) leakage signal of a predetermined frequency from the received radio signal, wherein the detecting of the GPS leakage signal includes detecting a harmonic frequency signal
Data Source
AI summary
An unmanned aerial vehicle (UAV) detection method and a system therefor are provided. The UAV detection method includes receiving a radio signal from air, detecting a global positioning system (GPS) leakage signal of a predetermined frequency from the received radio signal, and determining that a UAV is detected when the GPS leakage signal is detected.