Performance evaluation by MIMO transmission in small rocket

摘要

Development of rockets without people which is represented by Hayabusa etc. has attracted much attention. In the rockets which are frequently re-used, health monitoring system which supervises inside rockets is one of key important issue for improvement in operability and/or urgent return judgment [1]. Although communication between the sensors inside the rocket are connected by wires in the current system, in order to accurately check the state in the rocket, the weight of the rocket becomes very heavy due to a large number of sensors. In this paper, we solve this problem by employing a wireless communication in the small rocket. Moreover, MIMO (Multiple Input Multiple Output) transmission [2] is incorporated in the wireless system inside the small rocket for further improvement on bit rate. However, since the propagation characteristics are not clarified inside the small rockets, in this paper we investigate the characteristics of 2×2 MIMO transmission by using a ray-tracing simulation and measurement using the small rocket which is actually used in health monitoring system.