GPS meteorology: Reducing systematic errors in geodetic estimates for zenith delay

摘要: Differences between long term precipitable water (PW) time series derived from radiosondes, microwave vapor radiometers, and GPS stations reveal offsets that are often as much 1–2 mm PW. All three techniques thought to suffer systematic errors of order 1 Standard processing algorithms known be sensitive the choice elevation cutoff angle at this level. We present a protocol is shown reduce dependence in geodetic estimates zenith delay and, hence, water. This includes use Niell mapping functions International Service phase center models.