The Design Principle Of X-band Data Transmission System For Micro-nano Satellite

Because of its miniaturization,compactness and diversification,micro-nano satellites have become hotspots in the field of aerospace in recent years.Due to the limitation of its volume,weight,power consumption and cost,the data transmission link of micro-nano satellites generally do not meet the needs of equivalent isotropic radiated power(EIRP)of conventional satellites.Therefore it is necessary to find a higher cost-effective design scheme of data transmission system.This paper is based on the micro-nano satellite engineering model.According to the load data transmission needs and through theoretical analysis and engineering demonstration,the operation frequency,encoding mode and modulation mode of data transmission system are optimized.X-band is selected as the system operation frequency and cascading RS(255,223)and 4D-8PSK-TCM2.0 as the encoding modulation.The paper accomplishes the link calculation and index decomposition and puts forward the system design scheme and studies the implementation of single in the system.Through the combination of Ethernet protocol,SATA interface,SSD,satellite data processing and modulated emission technique,the system design scheme not only achieves the interaction of Ethernet protocol,CCSDS AOS protocol and SATA protocol,but also implements the data synthesis,storage management,joint code modulation and other core functions.Through the exploration of the application of MMIC、MEMS、Si P and Ga N power amplifier,the data processor and data transmitter have been miniaturized and high-function integrated.At last,the paper presents the system testing scheme and verifies its soundness and correctness.This paper covers the link design of micro-nano satellite data transmission,scheme design of micro-nano satellite data transmission system,the design and implementation of single in data transmission system and the verification of system.