Passive Ubiquitous Perception System Oriented to Aerospace-Ground Internet of Things Communication

Because the aerospace-ground Internet no longer relies on deploying infrastructure such as base stations, it has the advantage of all-weather full coverage services that traditional terrestrial networks do not have. However, the traditional global navigation satellite system does not support communication services. The newly developing aerospace network system is still in the construction stage, and there is no applicable solution yet. Passive communication technology is an important method to solve the contradiction between the low battery capacity of the Internet of things (IoT) node and the high energy consumption of communication. It is the development trend of the IoT. However, the current passive technology based on Wi-Fi and other signals cannot achieve arbitrary communication due to the excitation signal acquisition problem. To solve the above two major problems, this paper proposes a passive system design for aerospace-ground IoT communication. The system can use the global navigation signal as excitation signal for backscatter communication. Because the global navigation signal has the characteristics of all-weather and full coverage, this design solves the carrier acquisition problem in previous work. In addition, this paper also proposes a low-power signal detection technology that can detect navigation signals with high precision on passive devices. We evaluate system performance through simulation experiments. The experimental results show that the backscatter system based on global navigation satellite signals can realize efficient communication of IoT nodes.