Abstract:

After the GPS signals reflected from the sea surface is analyzed, the effects on the correlation power of GPS C/A code caused by marine targets passing through the first Fresnel zone are studied. With this understanding, a passive detection of marine targets based on GPS signals reflected from the sea surface is presented. Ground experiments based on the method have been made with a GPS LHCP antenna and a software receiver. Results show that the correlation power of the reflected GPS C/A code varies obviously as the target passes through the first Fresnel zone, the variation can be measured by accumulation and average, and thus the target is detected.