一种基于再生伪码测距的遥测信号测距方法

A Telemetry Signal Ranging Method Based on Regenerative PN Ranging

为了简化深空探测器无线测量系统设计,解决下行系统受功率、带宽等因素限制遥测信号和测距信号权衡设计问题,在再生伪码测距技术的基础上,提出了一种基于遥测信号测距的新方法,以遥测数据符号代替测距伪码的功能,利用地面跟踪环路对遥测信号的跟踪测量实现下行测距,减少了独立的下行测距信号。分析和仿真结果表明:新方法简化了下行信号形式,降低了系统实现复杂度,在遥测码速率为100 kbit/s左右时,随机测距误差优于传统再生伪码测距模式,且随着遥测码速率的增加测距精度进一步改善。

To simplify the complexity of the deep space probe and solve the problem of the balance design between the downlink telemetry and ranging signal under the constraint of the limited power and band- width, a novel telemetry signal ranging method is proposed in this paper based on the regenerative pseudo noise （PN） ranging technique. The PN code is replaced by telemetry data symbol, and the downlink range measurement is realized by tracking telemetry signal at the ground tracking loops to save an independent ranging signal. The results of the analysis and simulation show that the proposed method can simplify the downlink signal and reduce the complexity of the system, and the stochastic ranging error is better than that of traditional method when the telemetry rate exceeds 100 kbit/s. With the higher telemetry rate, the better ranging accuracy can be achieved.