摘要
导航卫星面向特定区域播发点波束功率增强信号,是提高导航信号抗干扰性能的一种有效措施。针对点波束功率增强信号具有波束宽度窄、指向可变的特点,研究了信号功率增强幅度、半波束角和扫描角等工作参数对覆盖性能的影响。分析结果表明,功率增强幅度在0~20dB变化时,等效载噪比线性增加,具有最好的增强效果。当高轨地球同步轨道(geosynchronous earth orbit,GEO)/倾斜地球同步轨道(inclined geosynchronous earth orbit,IGSO)卫星和中轨道(medium earth orbit,MEO)天线半波束角分别为0.86°和1.31°时,在卫星发射总功率不变的条件下可实现20dB的点波束功率增强,对应的作用区半径分别为542km和494km。当GEO/IGSO卫星和MEO卫星天线扫描角分别取7.79°和11.90°时,最大功率增强覆盖范围半径可达到9046km和8538km。
It is an effective measure to improve the anti-jamming performance of navigation signals that navigation satellites transmit spot beam power enhancement signals for specific regions.In view of the narrow beam width and variable direction of the spot beam power enhancement signal,the effects of working parameters such as power enhanced amplitude,half-beam angle and sweep angle on the coverage performance are studied.The analysis results show that when the amplitude of power enhancement varies from 0 to 20 dB,the equivalent noise ratio increases linearly and has the best enhancement effect.When the half-beam angles of geosynchronous earth orbit(GEO)/inclined geosynchronous earth orbit(IGSO)and medium earth orbit(MEO)satellite antenna are 0.86°and 1.31°respectively,the 20 dB power enhancement amplitude can be achieved with the corresponding radius of 542 km and 494 km.When the sweep angles of GEO/IGSO and MEO satellite antenna are 7.79°and 11.90°respectively,the maximum coverage radius reaches 9046 km and 8538 km.
作者
吕志成
李蓬蓬
李立勋
LYU Zhicheng;LI Pengpeng;LI Lixun(College of Electronic Science,National University of Denfense Technology,Changsha 410073,China)
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2021年第10期2954-2960,共7页
Systems Engineering and Electronics
基金
青年自然科学基金(62003354)资助课题。
关键词
卫星导航系统
功率增强技术
点波束
satellite navigation system
power-enhanced technology
spot beam
