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The sun illuminates layers of the Earth’s atmosphere, as viewed from the International Space Station. A solar geoengineering proposal to reduce global warming’s effects would target an upper layer of the atmosphere. For decades, climate scientist David Keith of Harvard University has been trying to get people to take his research seriously. He's a pioneer in the field of geoengineering, which aims to combat climate change through a range of technological fixes. Over the years, ideas have included sprinkling iron in the ocean to stimulate plankton to suck up more carbon from the atmosphere or capturing carbon straight out of the air. Keith founded a company that develops technology to remove carbon from the air, but his specialty is solar geoengineering, which involves reflecting sunlight away from Earth to reduce the amount of heat that gets trapped in the atmosphere by greenhouse gases. The strategy hasn't been proven, but modeling suggests it will work.|In this study, we propose an innovative method for the real-time detection of GPS spoofing attacks targeting drones, based on the video stream captured by a drone’s camera. The proposed method collects frames from the video stream and their location (GPS); by calculating the correlation between each frame, our method can identify an attack on a drone. We first analyze the performance of the suggested method in a controlled environment by conducting experiments on a flight simulator that we developed. Then, we analyze its performance in the real world using a DJI drone. Our method can provide different levels of security against GPS spoofing attacks, depending on the detection interval required; for example, it can provide a high level of security to a drone flying at an altitude of 50-100 meters over an urban area at an average speed of 4 km/h in conditions of low ambient light; in this scenario, the method can provide a level of security that detects any GPS spoofing attack in which the spoofed location is a distance of 1-4 meters (an average of 2.5 meters) from the real location.




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