30. Can you explain the benefit of "Interpolation"?
The National Geodetic Survey (NGS) provides GPS observation data at certain sites with a 30 second sampling rate. This rate may too slow for some applications. When a non-default sampling rate is requested, NGS will use the 30-second data to generate a new RINEX-format file with interpolated GPS satellite observations at the user-selected rate. New code range (pseudorange), Doppler, carrier phase, and receiver clock offsets (if available) are interpolated. Error of interpolated code range data seldom exceeds 10 cm. Due to the possibility of cycle slips, interpolated carrier phase must be considered experimental. For more detailed discussion of the accuracy of interpolated data, the applicability of interpolated data to positioning, and the interpolation algorithm, please refer to the user documentation for the interpo program.