标题:
虚拟基线的相位跳变及校正
Phase Jump of Virtual Baseline as Well as Correction
作者:
郁涛
关键字:
虚拟基线, 相位跳变, 相位干涉仪, 相位模糊
Virtual Baseline; Phase Jump; Phase Interferometer; Phase Ambiguity
期刊名称:
《Journal of Antennas》, Vol.2 No.1, 2013-03-29
摘要:
分析发现，在对相邻两基线采用异侧比值相减方式构造虚拟短基线时，在部分的到达角方向上，波长整周数的差值将不为零，而是存有跳变。并且，在利用虚拟短基线的无模糊测向结果求解长基线的相位模糊值的过程中同样存有相位跳变问题。本文的分析表明，通过对到达角的正弦值进行判别即可实现校正，且修正因子即为两基线差值的比例因子。最后通过应用精确测向公式从理论上说明，若不考虑相差测量误差，则通过校正之后，采用一维双基线阵列即能获得较高的测向准确性。
While the virtual short baseline is constructed by using the ratio subtraction in contrary terminal for adjacent two baselines, the differential of wavelength integer is not to zero in some arrival angle direction and but there is a jump. At the same time, there is also jump problem while using the DF result of virtual short baseline without phase ambiguity solves the phase ambiguity valuation of long baseline. The analysis in this paper shows that the emendation can be realized by distinguishing for the sinusoidal valuation of arrival angle. Also, the modifying factor is namely the proportional factor of differential between two baselines. Finally, applying the accurate DF formula explains in theory that higher accuracy of DF can be obtained by using two baselines arrays after revising without considering the phase error.