卫星导航系统与射电天文兼容性分析

Analysis on Compatibility of Radio-Navigation Satellite Service and Radio Astronomy Service

基于国际电联对射电天文业务的特殊保护要求，介绍了《无线电规则》决议739射电天文业务（1610～1618 MHz）邻近频段内的RNSS业务（1559～1610 MHz）带外发射的门限要求。采用ITU-R M？1583建议书对非GSO系统在射电天文站址处产生的无用发射电平的分析方法进行评估。通过仿真计算，提出北斗卫星导航系统MEO、 IGSO和GEO卫星带外抑制限值，在确保北斗卫星导航系统自身系统稳定运行的条件下，满足对射电天文业务的特殊保护要求。

Based on special protection requirements of ITU for Radio Astronomy Service （RAS）,this paper introduces the out-band emission threshold requirements of RNSS service （ 1 559~1 610 MHz） in the adjacent bands to the RAS （ 1 610~1 618 MHz） . In ITU-R M.1583,the analysis on unwanted emission level of non-GSO system generated outside the radio astronomy station is evalua-ted.Through simulation calculation,the MEO,IGSO and GEO satellite out-of-band rejection limit values of Beidou satellite navigation system are proposed to ensure the stable operation of system and meet the special protection requirements of radio astronomy service.