A Precision Acceleration Determination Method Based on Combining GPS Carrier Phase and Doppler

Abstract

There are always disadvantages when GPS carrier phase observations or Doppler is used alone for determination of vehicle acceleration. Therefore, a combination method is developed in this paper, based on combinational using GPS carrier phase and Doppler observations. The basic idea is that two types of observation are combined by adding their normal equations, and their own weights are obtained by strict Helmet variance components estimation. To avoid the influence of outliers, the bi-factor equivalent weights strategy is adopted. To verify the validation of this method, GPS observation data of airborne gravimetry campaign MEXAGE2001 is tested. The results show that the precision of acceleration determination is better than 1 mm/s2, using this combined method.