UM2000移频信号的调频常数选择

UM2000移频信号是一个多频调制的调频信号,其中调频常数是一个关键的参数。本文分析了调频常数对移频信号频谱带宽以及能量分布的影响,给出了调频常数选择的一般原理。调频常数的值越大,移频信号的频谱能量越分散,带宽也就越宽,但边频所含的能量越多,抗干扰性能越强;调频常数的值越小,移频信号的频谱能量越集中,带宽也就越窄,但边频所含的能量越少,抗干扰性能越弱。所以应在保证带宽合适的前提下选择尽可能大的调频常数。最后根据UM2000移频信号低频信息与带宽的特点,利用卡森公式具体研究了UM2000移频信号的调频常数选择。得出UM2000移频信号的调频常数值选择在6是合理的,并通过与实际信号比较,得到验证。

Selection of Frequency Shift Signal UM2000

The UM2000 frequency shift signal is a multiple frequency-modulated signal,of which the frequency modulated constant is a key parameter.In this paper,the relationship between the frequency modulated constant and the frequency spectrum bandwidth and energy distribution of the frequency shift signal is analyzed,and the general principle of the frequency modulated constant selection is presented.The large the value of the frequency modulated constant,the wider the bandwidth of the frequency spectrum,but the higher interference-free capability;the smaller the value of the frequency modulated constant,the narrower the bandwidth of the frequency spectrum,but the lower the interference-free capability.On the basis the characteristics of the UM2000 frequency shift signal,the author implements a detailed research on the frequency modulated constant selection for the UM2000 frequency shift signal,and determines a theoretical frequency modulated constant value as six(6),which is verified by field data.