摘要
在卫星分包遥测静态分配适应单一遥测信道的方案基础上,提出了一种改进型动态自适应遥测信道速率的遥测分包方法,将包传输的控制参数由绝对参数优化为相对参数,从而满足不同信道速率、不同包源速率下的包传输适应性。该方法通过将遥测包周期计数与遥测包静态分配的传输周期的比值作为遥测包传输等待迫切比例系数,用相对的传输迫切比例系数值对全部遥测包进行排序,从大到小组入遥测信道下传。通过这种遥测包调度策略解决了遥测信道速率变换对包传输控制的影响。此外通过调节遥测包传输比例系数也能很好地解决遥测包数据率变化对信道传输的适应能力的影响,如数据率增加时整体降低包传输频率、数据率减少时整体加快包传输频率。
Based on the method that satellite packet telemetry adapts to single telemetry channel with static allocation, this paper proposes an improved dynamic packet telemetry method with an adaptive telemetry channel rate. This method opti-mizes the control parameters of packet transmission from absolute parameters to relative parameter to meet the required a- daptability of packet transmission under different rate of channel and packet source. The method takes the ratio of the te-lemetry packet period and the allocated static period of telemetry packet as the scale coefficient of the urgency degree of te-lemetry packet transmission. All telemetry packets are reordered using the sacle coefficient of the urgency degree and trans- mitted in the telemetry channel accordingly. By using this packet scheduling policy, the influence of the rate changing of the telemetry channel is solved. Furthermore） by adjusting the transmission ratio coefficient of the telemetry packets, the influ-ence of the rate changing of the telemetry packet on the adaptablility of the transmission channel is also minimized. For ex- ample,the transmission frequency of the packet decreases when the data rate increases and the transmission frequency of the packet increases when the data rate decreases.
出处
《飞行器测控学报》
CSCD
2016年第4期316-322,共7页
Journal of Spacecraft TT&C Technology
关键词
自适应遥测信道速率
静态遥测包调度策略
迫切比例系数
分包遥测
adaptive telemetry channel rate
static telemetry packet scheduling policy
urgency degree
packet te-lemetry
