基于帧同步的深空极低码速率数据回溯方法  

A Backtracking Method Based on Frame Synchronization for Deep Space Super Low Bit Rate Data

作　　者：陈少伍[1] 刘敏[1] 王静温 强立 卢欧欣 CHEN Shaowu;LIU Min;WANG Jinwen;QIANG Li;LU Ouxin(Beijing Institute of Tracking and Telecommunication Technology,Beijing 100094,China;Beijing Institute of Telemetry Technology,Beijing 100094,China;Xi’an Satellite Control Center,Xi’an 721000,China;Southwest China Institute of Electronic Technology,Chengdu 610036,China)

机构地区：[1]北京跟踪与通信技术研究所,北京100094 [2]北京遥测技术研究所,北京100094 [3]西安卫星测控中心,西安721000 [4]中国西南电子技术研究所,成都610036

出　　处：《深空探测学报（中英文）》2021年第6期608-613,共6页Journal Of Deep Space Exploration

基　　金：首次火星探测任务测控系统研究资助项目。

摘　　要：深空探测任务中遥测数传码速率极低、传输时间受限、数据接收总量有限,为获取尽可能多的数据,需减少不必要的流量传输并提高数据接收效率。针对传统帧同步中过程中三态逻辑转换中的数据损失问题,提出了一种适用于深空极低码速率条件下的帧同步回溯方法。利用有效的帧同步锁定状态信息,对帧同步过程中三态逻辑转换时的数据帧进行回溯,能够有效获取多帧可靠的遥测数据。在“天问一号”火星探测任务,提出的方法成功应用于环绕器和火星车极低码速率条件下遥测数据接收,结果表明引入该方法后接收的有效数据帧比传统方式多2~4帧,传输效率比传统方法提高了13%~40%。提出的方法能获取更多有效的数据并提高传输效率,适用于深空低码速率的数据接收,可用于后续小行星、木星及太阳系边际探测任务中。Due to the super low telemetry bit rate and limited transmitting time for deep space mission,the total received telemetry data is precious;it is necessary to obtain as much telemetry data as possible,and decrease overhead and increase the efficiency of data receiving.A backtracking method(BTM)for deep space super low bit rate frame synchronization data was proposed in this paper for the data loss in the process of three-state transfer in traditional frame synchronization.The data frames in the process of three-state transfer in frame synchronization were backtracked,and multiple valid telemetry data frames were obtained by using the valid frame synchronization information.The method was successfully applied to the super low telemetry data receiving for orbiter and rover in Tianwen-1 Mars exploration mission.The result shows that 2~4 more valid data frames were obtained with the method proposed compared with the traditional method,and transfer efficiency was improved by 13%~40%.More valid data frames and higher transfer efficiency could be obtained by using the method.The method proposed in this paper can be particularly useful for deep space super low bit rate telemetry data receiving,and could be used in the further exploration of asteroids,Jupiter and the boundary of the solar system.

关 键 词：深空探测 极低码速率 帧同步 传输效率 数据回溯 

分 类 号：V566[航空宇航科学技术]