A statistical study of the differential very long baseline interferometry delay rate error budget
Abstract
The delta differential oneway Doppler (deltaDOD) error budget is assessed by analyzing 12 years of dualfrequency Deep Space Network very long baseline interferometry data. A typical deltaDOD observation is outlined, and the Magellan error budget along with tropospheric effects are considered. Formation of quasarquasar observables, RMS deltaDOD residual, angular source separation and time separation between observations are discussed, along with elevation angle and atmospheric pathlength dependence, solarplasma and ionospheric effects. It is concluded that the weak dependence of the deltaDOD error on angular source separation can mean that quasars with larger angular separation from a spacecraft may be used as navigation reference with little increase in the deltaDOD error. It is also indicated that the deltaDOD errors are dominated by wet troposphere fluctuations, and the results of numerical integrations for the singlestation RMS delay rate at different elevation angles are presented.
 Publication:

Astrodynamics 1989
 Pub Date:
 1990
 Bibcode:
 1990asdy.conf..553E
 Keywords:

 Interplanetary Navigation;
 Orbital Position Estimation;
 Spacecraft Tracking;
 Very Long Base Interferometry;
 Doppler Navigation;
 Magellan Project (Nasa);
 Position Errors;
 Statistical Analysis;
 Time Lag;
 Space Communications, Spacecraft Communications, Command and Tracking