ITU-R S 1592-2002 Methodology to assess compliance of non-geostationary fixed-satellite service satellite systems in circular orbits with the additional operational limits on downl22 o.pdf
《ITU-R S 1592-2002 Methodology to assess compliance of non-geostationary fixed-satellite service satellite systems in circular orbits with the additional operational limits on downl22 o.pdf》由会员分享,可在线阅读,更多相关《ITU-R S 1592-2002 Methodology to assess compliance of non-geostationary fixed-satellite service satellite systems in circular orbits with the additional operational limits on downl22 o.pdf(28页珍藏版)》请在麦多课文档分享上搜索。
1、 Rec. ITU-R S.1592 1 RECOMMENDATION ITU-R S.1592 Methodology to assess compliance of non-geostationary fixed-satellite service satellite systems in circular orbits with the additional operational limits on downlink equivalent power flux-density in Article 22 of the Radio Regulations (2002) The ITU R
2、adiocommunication Assembly, considering a) that the World Radiocommunication Conference (Istanbul, 2000) (WRC-2000) adopted, in Article 22 of the Radio Regulations (RR), limits to the downlink equivalent power flux-density (epfd) radiated by non-geostationary (GSO) fixed-satellite service (FSS) syst
3、ems in certain frequency bands, to protect GSO FSS and broadcasting-satellite service (BSS) networks operating in the same frequency bands; b) that RR Article 22 includes single-entry validation limits to the epfdin RR Tables 22-1A to 22-1D, single-entry operational limits to the epfdin RR Tables 22
4、-4A, 22-4B and 22-4C, and single-entry additional operational limits to the epfdinto antennas of certain sizes in RR Table 22-4A1, which apply to non-GSO FSS systems for the protection of GSO FSS networks; c) that compliance of a proposed non-GSO FSS system with the single-entry validation limits wi
5、ll be evaluated by the Radiocommunication Bureau (BR), under RR Nos. 9.35 and 11.31, based on masks of pfd provided by the non-GSO FSS operator, using software defined in Recommen-dation ITU-R S.1503; d) that compliance of a proposed non-GSO FSS system with the single-entry operational limits to the
6、 epfd and, for certain antenna sizes, single-entry additional operational limits to the epfdis subject to verification by administrations; e) that RR Appendix 4, as modified by WRC-2000, requires an administration responsible for a non-GSO FSS system to ensure that the single-entry additional operat
7、ional limits to the epfdare met, recognizing a) that administrations with assignments to GSO FSS networks in frequency bands where additional operational limits to the epfdhave been established require a reliable and independent means to determine whether a particular non-GSO FSS system is in compli
8、ance with the single-entry additional operational limits to the epfd, for their GSO FSS networks, 2 Rec. ITU-R S.1592 recommends 1 that the methodology defined in Annex 1 to this Recommendation, based on a full simu-lation of downlinks in a non-GSO FSS satellite system interfering into an operating
9、GSO FSS earth station with a 3 m or 10 m antenna, be used to assess the levels of interference generated by the non-GSO FSS system, in order to verify compliance by the non-GSO FSS system with the additional operational limits to epfdin RR Article 22; 2 that the methodology in Annex 1 to this Recomm
10、endation, based on full simulation of downlinks in a non-GSO FSS satellite system interfering into a GSO FSS network, be used by GSO operators as guidance to assess the levels of interference generated by non-GSO systems into any diameter antenna of planned or operational GSO FSS networks. NOTE 1 An
11、nex 2 discusses an approach that could be used to demonstrate that additional operational limits are met by an operational non-GSO system interfering into an operational GSO FSS earth station. In contrast with Annex 1, which is based on a full simulation approach, Annex 2 is based on the pfd mask ap
12、proach adopted in Recommendation ITU-R S.1503. ANNEX 1 Methodology to assess compliance with additional operational limits of the interference generated by non-GSO FSS systems*sharing frequency bands with GSO FSS networks 1 Introduction This methodology is based on modelling the satellite systems in
13、 their orbits and allows each space station and earth station to track their respective targets, while taking into account the Earths rotation. A simulation of this model is sampled over a period of time at a suitably fine sampling rate, and at each sample the range gain product is computed. This ra
14、nge gain product can be related directly to the level of interference, and the sampled data can be evaluated to determine the percentage of time that the range gain product for all interference paths exceeds a given level. _ *The methodology defined in Annex 1 currently applies to only non-GSO syste
15、ms using circular orbits. Further study is needed for non-circular orbits. Rec. ITU-R S.1592 3 TABLE 1 Symbols and definitions used in this Annex a Angular velocity of satellite in Earth-fixed coordinates degrees/s Bt Transmit bandwidth Hz Ctraffic Traffic coefficient depending on local time D Anten
16、na diameter m E Argument of latitude degrees epfdDownlink equivalent power flux-density into earth station dB(W/m2) in reference bandwidth g Acceleration due to Earths gravity M/s2 G Universal (Newtonian) gravitational constant Nm2/kg2 Gt Relative gain of transmit antenna GrRelative gain of receive
17、antenna Grmax Maximum gain of GSO FSS earth station receiving antenna Grw Maximum gain of wanted receive antenna I Inclination of satellite orbit degrees I0 Interference power W J2 Second harmonic Earth potential constant k Boltzmanns constant J/K Lp Polarization isolation factor msMass of satellite
18、 kg Me Mass of the Earth kg N0 Noise power W NaNumber of transmitting non-GSO satellites visible from GSO FSS receiving earth station Ncoarse Integer ratio of coarse time step size to fine step size to define dual time step simulations Nhits Number of mainbeam-to-mainbeam coupling events between non
19、-GSO satellite antenna and GSO FSS earth station antenna PtRF power at input to transmitting antenna W r Orbital radius of satellite km rcRadius of non-GSO service area cell km rg Radius of GSO km rn Orbital radius of non-GSO satellite km R Range between non-GSO satellite and GSO FSS earth station m
20、 Re Radius of perfectly spherical Earth km T Receiver noise temperature K 4 Rec. ITU-R S.1592 TABLE 1 (end) 2 Input parameters required In order for this methodology to be applied, the following input parameters will need to be provided by the non-GSO operator. Note that, in the absence of complete
21、information on all these parameters, this Recommendation gives some guidance on, for example, possible distributions of non-GSO FSS earth stations to be modelled in the simulations. 2.1 Orbit parameters Number of space stations Number of planes To Orbit period s Tw Wanted receiver noise temperature
22、K t Simulation time increment s Earth station elevation angle degrees Topocentric angle defining exclusion zone for non-GSO satellite switching strategy degrees coarse Topocentric angle defining coarse step size in dual time-step simulation degrees FSR-1 Topocentric angle defining fine step region (
23、FSR) degrees FSR-2 Topocentric angle defining boundary of exclusion zone degrees Antenna off-boresight angle degrees 3Antenna 3 dB beamwidth degrees Wavelength m Earth attraction constant km3/s2 v Constant velocity of satellite degrees/s ve Orbital velocity of the Earth degrees/m vr Orbital velocity
24、 of non-GSO satellite relative to the Earths surface degrees/s vn Orbital velocity of non-GSO satellite degrees/s Angular velocity of satellite degrees/s Right ascension of the ascending node (RAAN) degrees 0 RAAN at time t0 degrees e Rotational angular velocity of the Earth degrees/s r Orbital prec
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ITURS15922002METHODOLOGYTOASSESSCOMPLIANCEOFNONGEOSTATIONARYFIXEDSATELLITESERVICESATELLITESYSTEMSINCIRCULARORBITSWITHTHEADDITIONALOPERATIONALLIMITSONDOWNL22OPDF

链接地址:http://www.mydoc123.com/p-793504.html