Comparison of microwave and light wave communication systems in space applications
Comparison of microwave and light wave communication systems in space applications
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DOI：
10.1117/12.625153
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发表时间：
2005-09
期刊：
影响因子：
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通讯作者：
M. Toyoshima;W. Leeb;H. Kunimori;T. Takano
中科院分区：
文献类型：
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作者：
M. Toyoshima;W. Leeb;H. Kunimori;T. Takano
光学和射频通信系统的性能针对长距离应用进行了比较，例如：深空通信，信噪比至关重要。我们比较了使用强度调制和雪崩光电二极管直接检测在 0.8 μm 下运行的光通信系统、使用开关键控和光学前置放大器在 1.5 μm 下运行的光通信系统以及在 X 波段运行的射频通信系统。假设链路预算分析的典型系统参数，我们发现，当发射和接收天线之间的距离（R）为106 km时，光学系统的信噪比与R-4成正比，射频系统的信噪比与R-2成正比。对于超过 107 公里的距离，射频系统可实现的最大数据速率高于光学系统。对于与低地球轨道链路以及地球静止地球轨道链路相对应的距离，当数据速率高于几Gbit/s时，具有光学前置放大功能的光学系统是优选的。
The performances of optical and radio frequency communication systems are compared for long distance applications, e.g. deep space communications, where the signal-to-noise ratio is crucial. We compare an optical communication system operating at 0.8 μm using intensity modulation and direct detection with an avalanche photodiode, an optical communication system operating at 1.5 μm using on-off keying and an optical preamplifier, and a radio frequency communication system operating in the X-band. Assuming typical system parameters for the link budget analysis, we find that for distances between the transmitting and receiving antennas (R) of 106 km the signal-to-noise ratios for the optical systems are proportional to R-4, and that for the radio frequency system is proportional to R-2. For distances beyond 107 km, the maximum data rate achievable with the radio frequency system is higher than that with the optical systems. For distances corresponding to low earth orbit links as well as for geostationary earth orbit links, an optical system with optical preamplification is preferable when the data rate is higher than several Gbit/s.