The interferometric approach to the calibration problem consists in the use of observation differences of two receivers instead of single observations. Introducing the satellite positions and one receiver position as known we determine delay differences, frequency differences and coordinate differences (baseline components in a horizontal system) in our adjustment procedure.
Numerical results will be presented and optimum strategies for calibration parameter determination (e,g, delay differences, antenna phase center differences) will be discussed.
Since 1581 a JMR-4A Doppler eceiver is used mostly for stationary observations at the Potsdam observatory. The research activities have three main directions: 1. Methodical investigations of satellite interferometry using Doppler receivers and receiver calibration, 2. Computation of regional networks using the orbital program POTSDAM-5, 3. Computation of long global arcs for determination of polar motion and station coordinates.