这种模式是非常敏感的电离层多普勒调制。
This mode is very sensitive to the ionospheric Doppler modulation.
旋转部件的多普勒调制信息具有良好的姿态角稳定性，是雷达识别直升机的主要信息来源。
Doppler modulated echo information of helicopter rotors has a better stability of the aircraft's attitude, which is the main information source of radar identifying helicopters.
为了提高激光多普勒调制器调制频率的稳定度，通过从光学、机械、电子学等方面的优化，对影响多普勒调制器的各种因素进行了深入的研究。
In order to improve the frequency stabilization of the Doppler modulator, a series of affecting factors are considered in depth and optimized in the aspects of optics, mechanics and electronics.
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