Outdoor Gunshot Detection Using Correlated NIR and Acoustic Sensing
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Solution Overview
Problem
Accurate outdoor gunshot detection is complicated by environmental factors such as lightning, sirens, and loud music, and existing systems struggle to differentiate between gunshots and other loud events, leading to false positives.
Innovation Solution
A single unit outdoor gunshot sensor device utilizing near-infrared (NIR) band sensing for muzzle flash detection and acoustic sensors for high-intensity sound detection, with cable-free communication and embedded processing to correlate acoustic and infrared data, minimizing false positives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If acoustic sensors alone are used for gunshot detection, then the system is simple, but false positives increase due to environmental factors like sirens and loud music
Solution Approach 1:
The patent combines acoustic sensors with infrared sensors into an integrated detection system. The acoustic sensors detect gunshot sounds while the infrared sensors detect the thermal signature of muzzle flashes. By merging these two different sensing modalities, the system achieves more reliable gunshot detection with reduced false positives, as both acoustic and infrared signatures must coincide to confirm a gunshot event.
Solution Approach 2:
The detection system performs multiple functions using a single integrated platform. It simultaneously detects acoustic signals, infrared radiation, and correlates these data streams to identify gunshots. The system can also differentiate between gunshots and other environmental events, providing both detection and classification capabilities in one universal device.
2Reliability
If multiple sensors are used to improve detection accuracy, then false positives are reduced, but device complexity increases
Solution Approach 1:
The patent merges acoustic and infrared sensing capabilities into a single integrated detection unit. This consolidation allows the system to utilize multiple sensor types for improved accuracy while managing complexity through unified system architecture, shared processing resources, and coordinated sensor operation within one device platform.
3Measurement precision
If environmental factors are monitored to reduce false positives, then detection precision improves, but processing requirements and complexity increase
Solution Approach 1:
The system performs self-verification by cross-checking acoustic and infrared detections against each other. When an acoustic gunshot detection is made, the system automatically searches for corresponding infrared muzzle flash signatures, and vice versa. This self-service correlation approach improves precision without requiring external calibration or complex environmental modeling, as the system uses its own dual-sensor data to verify detections.
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
Enables rapid and accurate gunshot detection with minimal false alarms, maintaining privacy by excluding low sound pressure level conversations and ignoring reverberations, and providing gunshot localization without environmental calibration.
Implementation Method 1
collecting infrared information using a gunshot sensor device, wherein the collecting infrared information is performed by at least two infrared sensors co located in a single gunshot sensor device unit, and wherein the infrared information is collected using near-infrared (NIR) band sensing
Implementation Method 2
collecting acoustic information using the gunshot sensor device, wherein the collecting acoustic information is performed by at least two acoustic sensors also co-located in the single gunshot sensor device unit
Data Source
AI summary
Techniques for single unit outdoor gunshot detection are disclosed. Near-infrared band sensing collects infrared information using a gunshot sensor device. The collecting is performed by at least two infrared sensors in a single gunshot sensor device unit. Acoustic information is collected using the gunshot sensor device. The collecting acoustic information is performed by at least two acoustic sensors also co-located in the single gunshot sensor device unit. The infrared sensors and acoustic sensors provide a 180° gunshot detection field. At least two additional infrared sensors and at least two additional acoustic sensors are added to the gunshot sensor device to augment the collecting. The additional infrared sensors and acoustic sensors enable a 360° gunshot detection field. A gunshot is detected using the gunshot sensor device. The detecting is based on analysis of the infrared and the acoustic information. The gunshot sensor device is powered using a solar panel.