【摘要】 从陆地移动通信中电波传播的双线模型出发,根据低轨卫星通信的特点,提出了一种适用于低轨卫星通信电波传播的双线模型。通过对模型的分析和计算,得出了自由空间衰减随卫星仰角变化的规律。在仿真过程中,假设了接收机在卫星轨道面内和轨道面外两种情况,分别对TE波和TM波的路径增益进行了讨论。结果表明,由于地面反射的存在,自由空间的衰减在只有直视路径的基础上产生了起伏振荡。合理利用这些规律,对于低轨卫星信道建模和卫星通信接收机设计具有一定价值。更多还原

【Abstract】 Based on the two-ray model for land mobile communication,a new two-ray model which is suitable for the low-orbit satellite communication is presented and the relation of space attenuation with the satellite elevation is deduced in this paper.For two cases of the receiver in and out of the orbit plane,the path gain of TE and TM wave is discussed in the procedure of simulation,respectively.It is proved that the path gain has rippled due to reflection of the ground.The conclusions presented are useful for channel modeling and receiver design of the Low-orbit satellite communications.更多还原