Efficient interpolation of high-frequency domain data by phase smoothing
Article first published online: 1 AUG 2008
Copyright 2008 by the American Geophysical Union.
Volume 43, Issue 4, August 2008
How to Cite
2008), Efficient interpolation of high-frequency domain data by phase smoothing, Radio Sci., 43, RS4S16, doi:10.1029/2007RS003804., , , and (
- Issue published online: 1 AUG 2008
- Article first published online: 1 AUG 2008
- Manuscript Accepted: 22 MAY 2008
- Manuscript Revised: 1 MAY 2008
- Manuscript Received: 18 DEC 2007
- phase smoothing;
- matrix pencil
 In this paper, a novel phase-smoothing method is proposed to efficiently interpolate the fine resolution frequency data from sparse samples in the high-frequency range. This is achieved by taking the effect of the complex exponential term e−jkr in the electromagnetic field into account, which causes the oscillation in the system response especially in the high-frequency domain. By phase-smoothing, even though the magnitude of the field quantity is unchanged, both real and imaginary parts of the frequency response become smoother. The interpolation is performed separately for both real and imaginary parts so that the sample rate required for accurate reconstruction is significantly reduced. The interpolation is carried out by the matrix pencil method, the coefficients of which are calculated by using the total least squares implementation to improve accuracy. Several numerical examples are presented to illustrate the applicability of this unique phase-smoothing method in ultra-high-frequency bands.