Research on time synchronization technology of virtual radio

Abstract

Abstract-The time synchronization in the virtual radio system is determined as one of thorny technical problems. Especially in TT&C (Telemetry、Tracking and Command) system, it requires incredible precision with time. A novel method for time synchronization by high-precision in a unified virtual radio model specially designed is derived based on AD/DA cache and software cache in the present study. The unified virtual radio model with distributed frame is designed for most applications of virtual radio. And on this basis, the time synchronization strategy is detailed on time synchronization strategy from two designs of daughter card and front-end computer software. Finally, it is also discussed preliminary that time delay of demodulation for this model have an effect on radio system (TT&C).

Communication and ranging composite system based on parallel combinatory spread spectrum technology

“…Therefore, spread spectrum technology is usually used to implement the composite system. Wang (2015) used Direct Sequence Spread Spectrum (DSSS) technology to design the composite system, but there are some problems such as the technical parameters contradiction. Yi (2007) proposed a composite system based on Tamed Spread Spectrum (TSS) technology, which can solve the contradiction between ranging range and communication rate, but cannot meet the demands of high efficiency information transmission.…”