摘要
为了精确解算星间距离及距离变化率,从而恢复地球重力场,介绍了一种在K波段测距系统中的基带信号跟踪处理方法.这种方法依据数字锁相理论,给出了环路的结构框图及KBR基带信号模型.同时给出了KBR基带信号跟踪环设计方法和仿真参数的具体确定.最后以图和表格的形式给出了Matlab仿真结果,结果表明这种方法能很好地跟踪重力卫星动态,精确地提取载波相位,可使得静态相位跟踪误差小于10-4Hz,动态情况下能保持稳定跟踪,对恢复地球重力场有重要意义.
In order to calculate the inter-satellite range and range change rate precisely and recover the gravitational field of the earth, this paper introduced a processing method of base band signal tracking of KBR（K-band ranging） system. This method was based on the theory of digital phase lock loop. It gave the block diagram of the loop and the base-band signal model of KBR. Meanwhile the paper gave the design method of base band signal tracking loop of KBR and the definition method of the simulation parameter. At last the simulation results of Matlab were shown in the form of figures and tables. This method can track the dynamic situation of gravity satellite well, extract the quantity of carrier phase exactly and ensure that the static phase tracking error is less than 10^-4Hz and keep tracking stably in dynamic situation. This is significant for recovering the gravitational field of the earth.
出处
《应用科技》
CAS
2009年第4期11-14,共4页
Applied Science and Technology
关键词
微波测距系统
多普勒频移
跟踪环
microwave ranging system
Doppler frequency shift
tracking loop
