CRPA Neutralization Using Passive Propagation Mirrors
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Solution Overview
Problem
Current technologies face difficulties in neutralizing controlled reception pattern antennas (CRPA) on small, illegal unmanned aerial vehicles (UAVs) due to the limited number of radio wave interference sources that can be effectively operated, which is constrained by the degree of freedom (DOF) condition, and require large-capacity, high-power RF equipment for jamming, making it challenging to disable the CRPA's signal processing algorithm.
Innovation Solution
The use of a system comprising interference signal generators and passive propagation mirrors, which transmit and reflect interference signals in different directions to neutralize the CRPA with fewer physical RF interference signal sources than the DOF condition, allowing for efficient neutralization of illegal UAVs without the need for additional high-power amplifiers or extensive equipment deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of physical RF interference signal sources is increased to meet the DOF condition (N-1), then the CRPA neutralization effectiveness is improved, but the equipment complexity and operational difficulty increase significantly
Solution Approach 1:
The patent introduces passive propagation mirrors as intermediary elements that reflect RF interference signals toward the CRPA. These mirrors act as mediators between the interference signal sources and the target CRPA, enabling the system to achieve neutralization with fewer physical transmitters by utilizing reflected signal paths
Solution Approach 2:
The patent adds spatial dimensionality to the interference signal delivery system by deploying passive propagation mirrors at different locations and orientations. This creates multiple signal paths (direct and reflected) from fewer sources, effectively increasing the dimensionality of the interference field without proportionally increasing the number of transmitters
2Power
If large-capacity high-power RF equipment is deployed to overcome the DOF limit, then the interference signal strength is improved, but the power consumption and equipment size increase
Solution Approach 1:
Passive propagation mirrors serve as energy-efficient intermediaries that redirect RF signals without requiring active power amplification. The mirrors reflect interference signals from lower-power sources with sufficient strength to neutralize the CRPA, eliminating the need for high-power amplifiers
Solution Approach 2:
The system creates multiple copies of interference signals through reflection off passive mirrors. A single transmitted signal is copied and redirected multiple times to reach the CRPA from different angles, effectively multiplying the interference impact without proportionally increasing the transmitted power
3Adaptability or versatility
If more than N-1 interference signals are transmitted simultaneously, then the CRPA neutralization capability exceeds the DOF condition, but the signal processing complexity and operational limitations increase
Solution Approach 1:
Passive propagation mirrors simplify the operational complexity by providing fixed, pre-positioned reflection paths. Operators only need to position mirrors strategically rather than managing complex multi-transmitter coordination, making it easier to achieve neutralization capability beyond the DOF condition
Solution Approach 2:
The system performs preliminary action by pre-deploying passive propagation mirrors in strategic positions before operation. These mirrors are positioned in advance to create optimal reflection paths, eliminating the need for real-time complex signal coordination and simplifying operational procedures
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 effectively neutralizes CRPA-equipped UAVs by increasing the number of interference signal sources beyond the DOF limit, providing a non-powered and maintenance-free solution to protect against illegal UAV threats using fewer jammers and radio wave reflection mirrors, thereby safeguarding national assets and human life.
Implementation Method 1
a first passive propagation mirror reflecting the first reflected wave inducing signal toward the illegal UAV so that the first reflected wave propagates toward the CRPA of the illegal UAV
Data Source
AI summary
An apparatus of controlled reception pattern antenna (CRPA) neutralization for an illegal unmanned aerial vehicle (UAV) includes an interference signal generator transmitting a direct wave toward a CRPA of an illegal UAV through a first transmission antenna and transmitting a first reflected wave inducing signal through a second transmission antenna and a first passive propagation mirror reflecting the first reflected wave inducing signal toward the illegal UAV so that the first reflected wave propagates toward the CRPA of the illegal UAV.