Autocorrelation Radar Spin Measurement
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Solution Overview
Problem
Existing systems for spin measurement of projectiles, such as baseballs and tennis balls, are expensive and provide error-prone results, making them difficult to use effectively for athletes seeking to improve their performance by understanding spin dynamics.
Innovation Solution
A method using electromagnetic radar signals to measure the spin of projectiles by performing an autocorrelation process on the reflected signals, which estimates the spin rate based on the periodic nature of the signals received as the projectile rotates, combined with Doppler shift analysis for precise spin determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photographic data systems are used to determine spin, then spin measurement can be achieved, but the system becomes expensive and error-prone
Solution Approach 1:
The patent replaces the mechanical/optical photographic system with an electromagnetic radar-based system. Instead of using high-speed cameras and photographic analysis to measure spin, the invention uses electromagnetic waves to detect the projectile's rotation through Doppler shift and autocorrelation analysis, thereby reducing system complexity and cost while maintaining measurement capability
Solution Approach 2:
The patent changes the measurement parameter from visual/image-based detection to electromagnetic signal-based detection. By measuring the frequency shift and autocorrelation of reflected radar signals rather than analyzing photographic sequences, the system achieves spin measurement with simpler, more reliable equipment
2Measurement precision
If photographic data systems are used to determine spin, then spin measurement can be achieved, but the system becomes difficult to use
Solution Approach 1:
The radar system automatically processes the reflected signals through autocorrelation analysis to determine spin rate, eliminating the need for manual image analysis or complex photographic setup. The system performs self-calibration and automatic measurement, making it much easier to operate while maintaining accurate spin detection
Solution Approach 2:
The patent implements automatic feedback processing where the radar system continuously receives reflected signals, performs real-time autocorrelation analysis, and provides immediate spin rate feedback. This automated feedback loop eliminates the complexity of manual measurement and interpretation required by photographic systems
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 provides accurate and cost-effective spin measurement, enabling athletes to receive immediate feedback and improve their performance by understanding the dynamics of spin variation versus flight path.
Implementation Method 1
A reflected electromagnetic radar signal is received from the projectile... An autocorrelation process is performed on the reflected electromagnetic radar signal using the component to generate an estimate of a spin of the projectile
Data Source
AI summary
A method for determining spin of a projectile comprising generating an electromagnetic radar signal and transmitting the electromagnetic radar signal towards a projectile. Receiving a reflected electromagnetic radar signal from the projectile. Identifying a component of the reflected electromagnetic radar signal, and performing an autocorrelation process on the reflected electromagnetic radar signal using the component to generate an estimate of a spin of the projectile as a function of the autocorrelation process.