Staring Imaging Grating Spectrometer for Missile Detection
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Solution Overview
Problem
Current missile warning systems are costly and ineffective in high-clutter urban environments, particularly against man-portable air defense systems (MANPADS) and other projectiles, necessitating a low-cost, technologically advanced solution capable of operating in complex settings.
Innovation Solution
A staring imaging grating spectrometer with a diffraction grating within an optical train, employing detection processing, spectral discrimination, and temporal tracking to detect and declare missile launches by isolating discrete spectral features, such as the potassium doublet, using a single camera and adaptive thresholding to reduce false alarms and improve detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional missile warning systems are used, then detection capability is provided, but cost is high and effectiveness in high-clutter environments is poor
Solution Approach 1:
The patent replaces traditional mechanical/optical missile warning systems with a spectrometer-based detection system that uses spectral analysis of light. The spectrometer detects characteristic spectral signatures (such as the potassium doublet at 766.49 nm and 769.896 nm) emitted by rocket motors, substituting complex optical tracking with simpler spectral measurement that is more effective in cluttered environments.
Solution Approach 2:
The invention changes the detection parameter from general optical signal detection to specific spectral wavelength detection. By focusing on narrow spectral bands characteristic of rocket motor emissions, the system achieves higher reliability in distinguishing missiles from background clutter while using more affordable spectrometer technology.
2Measurement precision
If spectral discrimination is used to improve detection accuracy, then false alarms are reduced, but processing complexity increases
Solution Approach 1:
The patent extracts and isolates specific spectral features (the potassium doublet lines at 766.49 nm and 769.896 nm) from the full spectrum. By focusing detection on these specific wavelength regions rather than analyzing the entire spectrum, the system achieves high detection accuracy while keeping processing requirements manageable through targeted spectral measurement.
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
The solution provides a cost-effective, high-clutter capable missile warning system with reduced false alarms and improved detection accuracy, capable of discriminating between missile launches and background clutter, while being simple to set up and align, thus addressing the need for affordable and effective protection against various projectiles.
Implementation Method 1
The present invention employs a reflection grating or transmission grating to disperse light into individual wavelengths, from which spectral information is obtained for detection of projectile launches.
Data Source
AI summary
A detection system comprising detection processing means, spectral discrimination means, and temporal tracking and declaration processing means which cooperate to detect and declare a missile launch. A spatial filter isolates discrete spectral features in an image from a detector array. The discrete spectral features must pass a threshold, which may be adaptive. In a spectral discrimination step, the pixel-to-pixel separation for those pixels passing the spatial filter step is compared to a predetermined pixel spacing. The predetermined pixel spacing is determined from the optical setup and a spectral feature of interest that is contained within the emission from, for example, an ignited rocket motor or other fired projectile. In a temporal step, the pixels that have met the other criteria are tracked as candidate detections, which are declared a threat if they display characteristics of a moving threat, e.g., a MANPADS missile, RPG, mortar or the like.