Space debris detection over intersatellite communication signals

In this paper, we apply a space-borne radar and communications (SBRC) concept for detecting space debris over signals that are designed solely for communication purposes. By using a hidden capability of intersatellite communications signals to act as a radar signal as well, we propose a new approach for debris detection that can be used to address the challenges of long-distance and ground-based detection without introducing a separate space-borne radar infrastructure. The performance of the proposed SBRC approach is evaluated from the two timely perspectives in emerging satellite communications, i.e. high-density constellations and 5G satellites. Several new findings are discovered and demonstrated via sophisticated simulations. These include the effect of system-level cooperation gain in small debris detection and link-level estimation of high-velocity debris motion.