Arnon S
Department of Electrical and Computer Engineering, Ben Gurion University of the Negev, Post Office Box 653, Beer Sheva 84105, Israel.
Appl Opt. 1999 May 20;38(15):3229-33. doi: 10.1364/ao.38.003229.
To establish optical communication between any two satellites, the lines of sight of their optics must be aligned for the duration of the communication. The satellite pointing and tracking systems perform the alignment. The satellite pointing systems vibrate because of tracking noise and mechanical impacts (such as thruster operation, the antenna pointing mechanism, the solar array driver, navigation noise, tracking noise). These vibrations increase the bit error rate (BER) of the communication system. An expression is derived for adaptive transmitter power that compensates for vibration effects in heterodyne laser satellite links. This compensation makes it possible to keep the link BER performance constant for changes in vibration amplitudes. The motivation for constant BER is derived from the requirement for future satellite communication networks with high quality of service. A practical situation of a two-low-Earth-orbit satellite communication link is given. From the results of the example it is seen that the required power for a given BER increases almost exponentially for linear increase in vibration amplitude.
为了在任意两颗卫星之间建立光通信，在通信持续期间，它们光学系统的视线必须对齐。卫星指向和跟踪系统执行这种对齐操作。卫星指向系统会因跟踪噪声和机械冲击（如推进器运行、天线指向机构、太阳能电池阵列驱动器、导航噪声、跟踪噪声）而产生振动。这些振动会增加通信系统的误码率（BER）。本文推导了一种自适应发射机功率的表达式，用于补偿外差激光卫星链路中的振动影响。这种补偿使得在振动幅度变化时能够保持链路的误码率性能恒定。恒定误码率的动机源于对未来具有高质量服务的卫星通信网络的要求。给出了一个双低地球轨道卫星通信链路的实际情况。从示例结果可以看出，对于给定的误码率，随着振动幅度线性增加，所需功率几乎呈指数增长。
