Nonlinear Junction Detection Using Tunable Frequency Scanning
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Solution Overview
Problem
Current non-linear junction detection systems have limited detection range due to signal noise behavior and frequency mismatch issues, resulting in reduced effectiveness in detecting shielded electronic components or circuits, particularly in improvised explosive devices (IEDs).
Innovation Solution
Integration of tunable transmitters and receivers using a narrow-band signal with variable frequency between 10-1000 MHz to optimize coupling and reduce attenuation and coupling losses, allowing for enhanced detection of 2nd and 3rd harmonics and improved detection distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed frequency is used for transmission, then the device complexity is reduced, but the detection range and effectiveness are significantly limited due to frequency mismatch with transmission windows
Solution Approach 1:
The patent implements dynamic frequency tuning capability in both transmitter and receiver, allowing them to scan and adapt to different frequency ranges (10-1000 MHz) to match the transmission windows of the target system. This dynamic adjustment resolves the contradiction by enabling frequency adaptability while managing complexity through coordinated tuning mechanisms.
Solution Approach 2:
The patent changes the frequency parameter of both transmitter and receiver to optimize detection. By varying the transmission frequency and corresponding reception frequency across a wide range, the system can identify and exploit transmission windows in shielded targets, transforming a static fixed-frequency system into a dynamic parameter-adjustable system.
2Length of stationary object
If transmission power is increased to extend detection range, then safety regulations for personal protection are violated, but if transmission power is limited, then detection range is significantly reduced
Solution Approach 1:
The patent changes the frequency parameter to optimize signal coupling and reduce transmission losses. By finding the optimal frequency match with transmission windows, the system achieves maximum detection range with limited transmission power, avoiding safety hazards while extending effective detection distance.
Solution Approach 2:
The patent replaces brute-force power increase with intelligent frequency matching. Instead of increasing transmission power mechanically, the system uses frequency parameter optimization to achieve better signal penetration and detection range within safe power limits.
3Measurement precision
If simple circuits are detected, then the signal-to-noise ratio is adequate, but when high-quality shielded circuits are detected, the detection range is reduced by a factor of 8 to 12 times
Solution Approach 1:
The patent implements frequency parameter changes to match transmission windows in shielded circuits. By scanning and identifying optimal frequencies where shielded circuits transmit signals, the system maintains detection precision for high-quality shielded targets while extending detection range, overcoming the 8-12 times reduction caused by shielding.
Solution Approach 2:
The patent uses dynamic frequency scanning and adjustment to adapt to different target types. For shielded circuits, the system dynamically searches for transmission windows and adjusts operating frequencies accordingly, maintaining detection capability across diverse target conditions.
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
Significantly increases detection range and accuracy by finding the optimal frequency for maximum signal strength, enabling the detection of shielded electronic components and precise localization of targets, while minimizing errors from interfering frequencies.
Implementation Method 1
through which a narrowband signal f1 within a bandwidth of several hundred MHz can be radiated
Implementation Method 2
Due to their nonlinear behavior, signals coupled into the circuit at a fixed frequency are converted into signals with multiples of the incident frequency and then re-emitted
Implementation Method 3
evaluating a second and a third harmonic of the primary frequency reflected at the target
Data Source
Figure 1
AI summary
The invention relates to a device and a method wherein tunable transmitters (1.1) and detectors (receivers) (1.2) are integrated into a non-linear detection system (1) and a narrow-band signal having a variable frequency (f1) is used. The scannable frequency range should be between 10 - 1000 MHz. The frequency acceptance range for the second (f2) and third (f3) harmonic is adjusted according to the transmit frequency (f1).