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摘要:
数据传输及处理能力是月基平台构建中的一个重要问题，如何高效准确地传输海量对地观测数据至地球供后续研究是开展月基对地观测的关键环节。通过STK和MATLAB软件联合仿真，模拟月基平台对地观测数据传输链路，首次提出适用于月基平台的下行链路通信方案：通过构建中纬度地球站、最小间隔经度值为40°的2颗中继卫星组的设计方案，可以最大程度地实现全天候、无时断的信号传输，满足下行链路接收端获取足够强度和低误码率的信息，从而保障月基平台的运行。
Abstract:The ability of data transmission and processing is an important factor in the construction of the moon-based platform. How to transmit the observation data to the earth station efficiently and accurately is a critical step to carry out the further researches. Through the joint simulation of STK and MATLAB, we simulate data transmission link from Moon-based platform to Earth and put forward a downlink communication scheme for the platform. It has been proved that the scheme of two relay satellites with 40 degrees apart and of utilizing the middle latitude earth station can receive reliable information all the time. It could make the downlink receiver get information with enough power and low bit error rate, so as to ensure the operation of the moon-based earth observation platform.
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Key words:
- moon-based platform /
- earth observation /
- deep space communication /
- data transmission /
- link
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表 1 位置参数
Table 1. Position parameter
类型 名称 位置 地球站 Llat 16°52′N，112°20′E Mlat 39°54′N，116°23′E Hlat 73°15′N，115°05′E 月球站 MBPoint 0°S，0°E 
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表 2 直传模式地球站可见性概率
Table 2. Visibility probability of earth station in direct transmission mode
% 地球站 月球投影位置 南半球 北半球 由北向南过赤道 由南向北过赤道 Llat 42.94 56.12 46.76 48.11 Mlat 34.03 64.66 46.76 45.58 Hlat 0 100 47.73 34.55
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表 3 直传模式地球站有效通信概率
Table 3. Effective communication probability of earth station in direct transmission mode
% 地球站 月球投影位置 南半球 北半球 由北向南过赤道 由南向北过赤道 Llat 29.41 38.96 30.74 39.71 Mlat 29.28 49.11 29.03 41.89 Hlat 0 72.17 5.48 23.81
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表 4 单颗中继卫星模式地球站可见性概率
Table 4. Visibility probability of earth station in single relay satellite mode
% 地球站 月球投影位置 南半球 北半球 由北向南过赤道 由南向北过赤道 Llat 100 100 94.76 95.59 Mlat 100 100 94.76 95.59 Hlat 100 100 94.76 95.59
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