相差变化率的无模糊测量

Measurement for Phase Difference Rate Without Phase Ambiguity

首先,描述了基于多通道相差测量的相差变化率表示式,通过将对应于基线长度的时差项从相差变化率中剥离出来,提取得到了一个在单位长度上表征波长整周数和相差的差分特性的函数。随后所做的模拟计算发现,单位长度上的程差差分函数的变化是极有规律的,直接通过对实测获得的相差差分值域的判别,就能确定相应的校正数,由此得到的与波长整周数差分项无关的、且与原程差差分函数等值的函数表示式。本文的研究结果无疑为与相位测量相关的工程实用化设计提供了一种很有力的技术支撑。

Firstly, the expression of phase difference rate is described based on the multi-channel phase difference measurement. With stripping time difference item correspond to the baseline length from phase difference rate, a function is extracted which signifies the differential characteristics of wavelength integer and phase difference in a unit of length. Simulation calculation found that the variation of differential function of path difference in a unit of length is very regular. The corresponding corrected value can is determine directly by distinguishing the range of differential item of phase difference obtained by actual measurement. Thus, the function expression can be obtained that is equivalence with the quondam differential function of path difference and that is nothing to do with the difference item of wavelength integer. The research results in this paper may provide a powerful technical support for engineering practical design related to the phase measuring.