摘要：Although GNSS positioning is accurate in many different settings, indoor positioning remains both elusive and a very active area of current research. New services such as GPS L5 or Galileo E5 may provide a quantum leap in indoor positioning accuracy over earlier signal designs transmitted at E1/L1 or L2 frequencies. In this article, two engineers describe the use of a GNSS reflectometry system to measure deformation of the correlation function of various GNSS signals received indoors. The test results support the position that GNSS signals at L5 and E5 will improve the indoor positioning capabilities of receivers
