Analysis of tracking-pointing error and platform vibration effect in inter-satellite terahertz communication system

Combining the current development of high-gain antenna technology, the inter-satellite terahertz communication system's demand for acquisition pointing and tracking (Acquisition Pointing Tracking, APT) technology are analyzed based on the inter-satellite terahertz communication application. The tracking-pointing error has a major influence on the received power of the communication system by simulating and calculating the tracking-pointing error of APT subsystem. The higher the terahertz wave frequency, the greater influence of the tracking-pointing error. The influence of the vibration of the satellite platform on the terahertz communication are analyzed by simulation calculation. There is almost no influence on the terahertz communication when the frequency is 0.34THz, while the influence becomes larger when the frequency increases to 1.5 THz and above. The signal-to-noise ratio of the system changes periodically with the vibration of the satellite platform. This research provides the basis for the design of beam tracing and platform vibration controller of space terahertz communication system.