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针对陆地移动卫星系统中体积大、柔性强的星载天线使陆地移动卫星信道传播参数不稳定的问题,提出由星载天线振颤引起天线指向不精确的陆地移动卫星信道模型.研究复时间序列的衰落统计特性及在振颤临界值范围内对一阶统计特性的影响.仿真结果表明,天线振颤对所建信道模型的一阶衰落统计特性影响不明显,而对二阶衰落统计特性影响较大;在临界值范围内,对一阶衰落统计特性的影响小到可以忽略;在精确同步时,对陆地移动卫星系统的误码率影响较小.
Aiming at the problem that the bulk and flexible spaceborne antenna in terrestrial mobile satellite system make the parameters of terrestrial mobile satellite channel unsteady, a terrestrial mobile satellite channel model which is caused by satellite antenna chattering to point inaccuracy is proposed. And the influence on the first-order statistical properties in the critical range of chattering are simulated.The simulation results show that the influence of the antenna chattering on the first-order fading statistic characteristics of the channel model is not obvious, but the second-order fading statistic characteristics In the critical range, the impact on the first-order fading statistic properties is negligible; in the case of precise synchronization, the bit error rate of the terrestrial mobile satellite system is less affected.