primary amplitude

Introduces the working principle of a non-atmospheric window millimeter wave FMCW short range radar, analyzes the system primary parameters f_0 、 T_M 、Δ F_M and discusses the effect on parameters choice of Doppler result and parasitic amplitude modulation.

介绍了非大气窗口毫米波FMCW（调频连续波）近程雷达的工作原理，对系统的主要参数f0、TM、ΔFM进行了分析，并讨论了多普勒效应和寄生调幅对参数选择的影响。

The subharmonic instability can be found in a wide extent of the frequencies and Reynolds numbers and the growth rates and amplification factors of amplitude are much higher than that of the primary wave. The secondary subharmonic resonance may be an intrinsic transition mechanism of compressible boundary layer.

二次亚谐波在很宽频率和雷诺数范围内不稳定，其增长率和幅值放大因子都远大于初始波，二次亚谐共振是可压缩边界层转捩的内在机制。