航天器地面无线测试链路中断现象分析

摘要

The link outage in the ground spacecraft wireless test caused by the micro-Doppler frequency shift is studied in this paper. Firstly, the mechanism of its influence on the amplitude and the frequency of the received signal due to the Doppler frequency shift in a wireless test circumstance is analyzed, and it is shown that a very small Doppler frequency shift can lead to a distortion of the received signal, and cause the outage of the test link. Then, the space antenna diversity technology is proposed to improve the transmit quality of a wireless test link under a micro-Doppler frequency shift. Finally, the computer simulation verifies the effect of the Doppler frequency shift on test signals.%文章对航天器地面无线测试中微多普勒频移引起测试链路中断的现象进行了研究。首先着重分析了微多普勒频移对无线测试条件下接收信号幅度和频率的影响机理，指出微小的多普勒频移就能使得接收信号产生畸变，引发测试链路中断；然后，提出采用天线分集技术来改善微多普勒环境下无线测试链路的传输质量；最后，通过计算机仿真验证了微多普勒频移对无线测试信号的影响。