Harmonic Radar Battery Detection in Cluttered RF Environments
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Solution Overview
Problem
Existing methods for detecting batteries in cluttered environments are expensive and computationally intensive, and traditional radar systems struggle to differentiate battery reflections from other linear responses, especially in environments with hidden or obscured devices.
Innovation Solution
A harmonic radar system that generates and analyzes RF signals at a known frequency, leveraging the nonlinear response of batteries to detect them by identifying harmonic frequencies reflected or re-radiated by metal oxides in battery cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional radar systems are used to detect batteries, then detection capability is provided, but the system cannot differentiate battery reflections from other linear responses in cluttered environments
Solution Approach 1:
The patent changes the frequency parameter by transmitting at a fundamental frequency and detecting at harmonic frequencies (e.g., 2x, 3x the fundamental frequency). This parameter transformation allows the system to distinguish battery reflections from linear clutter, as batteries exhibit nonlinear frequency multiplication while other objects do not.
Solution Approach 2:
Instead of detecting the fundamental frequency as traditional radar does, the patent inverts the approach by detecting harmonic frequencies that are integer multiples of the fundamental frequency. This inversion enables differentiation of nonlinear battery responses from linear environmental reflections.
2Measurement precision
If expensive X-ray machines and machine-learning techniques are used for battery detection, then detection accuracy improves, but cost and computational requirements increase significantly
Solution Approach 1:
The patent replaces expensive X-ray machines with inexpensive RF transmitters and receivers. The system uses off-the-shelf components operating at standard radio frequencies, eliminating the need for costly specialized equipment while achieving comparable or superior detection accuracy through harmonic frequency analysis.
Solution Approach 2:
The patent substitutes complex machine-learning computational systems with a simpler physics-based harmonic detection method. By leveraging the natural nonlinear electromagnetic response of batteries at harmonic frequencies, the system eliminates the need for computationally intensive algorithms while maintaining high detection accuracy.
3Difficulty of detecting and measuring
If hidden or obscured devices are present in the environment, then device presence is concealed, but detection difficulty increases for traditional systems
Solution Approach 1:
The patent transforms the detection parameter from spatial location (where traditional radar looks for reflections) to frequency domain (where harmonic frequencies are detected). This parameter change allows detection of obscured batteries because their nonlinear harmonic response persists regardless of physical concealment, as long as they are within RF range.
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
Effectively detects batteries with high accuracy by distinguishing their nonlinear response from other environmental clutter, using less expensive equipment and simpler signal processing, suitable for environments with hidden or obscured devices.
Implementation Method 1
leveraging the nonlinear response of batteries to detect them by identifying harmonic frequencies reflected or re-radiated by metal oxides in battery cells
Implementation Method 2
identifying a harmonic frequency of the transmit RF signals in the filtered signals
Implementation Method 3
receiving a signal reflected or re-radiated by the battery in response to the TX carrier frequency signal
Data Source
AI summary
A harmonic radar system for detecting a battery may include a signal generator for generating one or more transmit radio frequency (RF) signals, one or more low-pass filters for removing harmonics from the transmit RF signals, a transmitting antenna for sending the transmit RF signals into an environment, a receiving antenna for receiving signals reflected or re-radiated by the battery in the environment in response to the transmit RF signals, one or more high-pass filters for filtering the received signals, and a spectrum analyzer for identifying a harmonic frequency of the transmit RF signals in the filtered signals.