A. Kavak, G. Xu and W. J. Vogel, “GPS Multipath Fade Measurements to Determine L-Band Ground Reflectivity Properties,” Proceedings of the 20th NASA Propagation Experimenters Meeting, Fairbanks, 4-6 June 1996, pp. 257-263.

has been cited by the following article:

• TITLE: Snow Water Equivalent Estimation for a Snow-Covered Prairie Grass Field by GPS Interferometric Reflectometry

  AUTHORS: Mark D. Jacobson

  KEYWORDS: Global Positioning System (GPS); GPS Interferometric Reflectometry (GPS-IR); Snow Depth;Snow Density; Snow Water Equivalent (SWE); Multipath; Specular Reflection

  JOURNAL NAME: Positioning, Vol.3 No.3, August 30, 2012

  ABSTRACT: The amount of water stored in snowpack is the single most important measurement for the management of water supply and flood control systems. The available water content in snow is called the snow water equivalent (SWE). The product of snow density and depth provides an estimate of SWE. In this paper, snow depth and density are estimated by a nonlinear least squares fitting algorithm. The inputs to this algorithm are global positioning system (GPS) signals and a simple GPS interferometric reflectometry (GPS-IR) model. The elevation angles of interest at the GPS receiving antenna are between 50 and 300. A snow-covered prairie grass field experiment shows potential for inferring snow water equivalent using GPS-IR. For this case study, the average inferred snow depth (17.9 cm) is within the in situ measurement range (17.6 cm ± 1.5 cm). However, the average inferred snow density (0.13 g.cm-3) overestimates the in situ measurements (0.08 g.cm-3 ± 0.02 g.cm-3). Consequently, the average inferred SWE (2.33 g.cm-2) also overestimates the in situ calculations (1.38 g.cm-2 ± 0.36 g.cm-2).