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本文(ITU-R QUESTION 149-17-1993 Frequency utilization on the far side of the Moon《月球远端的频率利用率》.pdf)为本站会员(appealoxygen216)主动上传,麦多课文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文库(发送邮件至master@mydoc123.com或直接QQ联系客服),我们立即给予删除!

ITU-R QUESTION 149-17-1993 Frequency utilization on the far side of the Moon《月球远端的频率利用率》.pdf

1、QUESTION ITU-R 149-1/7*Frequency utilization on the far side of the Moon (1990-1993) The ITU Radiocommunication Assembly, considering a) that some radioastronomical and other scientific experiments are difficult, and perhaps impossible, to carry out on the surface of the Earth by reason of troposphe

2、ric and ionospheric absorption and scintillation; b) that the development of spacecraft will enable experiments to be carried out in the relatively quiet environment on the far side of the Moon; c) that in addition to the establishment of line-of-sight communication links for scientific and other pu

3、rposes between the Earth and spacecraft, it may be necessary to establish links between stations on the far side of the Moon and other stations either on or visible from the Earth; d) that on the far side of the Moon a great degree of isolation from terrestrial radiation is provided at all radio fre

4、quencies; e) that Nos. 22.22 22.25 of the Radio Regulations recognize the necessity of maintaining the shielded zone of the Moon as an area of great potential for observations by the radio astronomy service and for passive space research and, consequently, as free as possible from transmissions; f)

5、that the optimum utilization of frequencies on the far side of the Moon requires better understanding of the shielding effects due to the presence of the Moon, decides that the following Question should be studied 1 In what way does the shielding caused by the Moon vary, as a function of frequency,

6、angular distance from the limb of the Moon towards the centre of the far side, and distance above the surface of the Moon? 2 What are the preferred means and routes for communicating between a station on the far side of the Moon and an earth station? 3 In what frequency bands would radioastronomical

7、 measurements have marked advantages as compared with observations from the surface of the Earth, if carried out on the far side of the Moon? 4 What frequency protection criteria should be adopted for a station on the far side of the Moon? further decides 1 that the results of the above studies should be included in (a) Recommendation(s); 2 that the above studies should be completed by 2011. NOTE 1 See Recommendation ITU-R RA.479. _ *In the year 2009, Radiocommunication Study Group 7 extended the completion date of studies for this Question.

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