基于星型链路的飞行器高码率数据采集传输系统设计与实现

Design and Application of Collection and Transmission System Based on Star Topology Links

摘要:

数据采集系统是飞行器遥测系统的关键组成部分，在高码率传输情况下防止出现数据误码率偏高和遥测参数精度恶化是十分重要的研究课题。针对采集传数据系统的多参数快速切换，在多种网络拓扑结构分析的基础上，设计了一种适用于飞行器上的星型链路高码率数据采集传输系统，消除了异源晶振频率漂移积累的时间误差。实践表明，该系统能有效地满足航天飞行器高码率数据隔离采集、存储、传输和故障隔离的要求，其隔离信号绝缘电阻在100MΩ以上，隔离采集精度不超过1%，以7Mbps码率传输时在约0.2个采样周期内可以快速稳定到采样电压值，实现大容量数据的高可靠采集和传输。

Abstract:

Data collection and transmission system is the key subject for aerocraft telemetry system. Avoiding high bit error rate and telemetry precision deterioration is the crucial subject under high bit-rate transmission. For the multi-parameter rapid switch of collection and transmission system, a star topology links collection and transmission system suitable for aircraft is introduced on the basis of multiple network topology structures, which can eliminate time error created by different crystal oscillator. Practice indicates that the system can effectively meet the demands of isolated acquisition and transmission and fault isolation, and the signal insulation resistance is above 100MΩ and the isolation acquisition accuracy is within 1%, acquisition voltage can be rapidly achieved within the first 0.2 acquisition period under 7Mbps transmission condition. This data collection and transmission system can satisfy the requirements of large capacity and high reliability.