摘要
文中研究了在低轨卫星星座中,星上处理器利用地面移动用户终端上行信号固有的多普勒频移信息预测切换时间的算法,该算法无需用户终端额外辅助。针对DDBHP算法预测误差大、成功率低等问题,提出了二维切换预测(2-DDUHP)算法,分析了解其唯一性,并给出了低复杂度的求解过程。研究表明:该预测算法能在各种仰角和测量条件下稳定工作,并能容忍较大的多普勒测量误差,有较强的实用价值。
A handover prediction algorithm based on inherent Doppler shift of the uplink signals is proposed and studied,and this algorithm could perform onboard LEO satellites without the aid of earth terminals.The proposed 2-Dimension Doppler-based Uplink Handover Prediction（2-D DUHP） technique solves the problems of DDBHP algorithm as large prediction error and instability,and then the unique of the solution is analyzed and low-complexity solution is given.The research results indicate that the proposed prediction algorithm could work stably with rough restrictions on maximum elevation,measurement time and large Doppler measurement error.
出处
《通信技术》
2010年第5期151-153,216,共4页
Communications Technology
关键词
低轨卫星星座
切换预测
多普勒频偏
球面三角学
LEO constellation
handover prediction
doppler drift
spherical trigonometry
