ИСТИНА

We present an approach to direct determination of the gravity disturbance vector from measurements along an aircraft's flight path. The approach is based on INS/GNSS integration. To improve observability of the gravity horizontal components (deflections of the vertical), we use a spatial model of gravity representing the disturbance potential with the spherical scaling functions. The estimation of the scaling coefficients and the INS systematic errors is performed jointly using the Kalman Filter in the information form. The results obtained from simulated data processing shows that the proposed approach is capable to improve accuracy of the gravity horizontal component determination in comparison with the one-dimensional approach based on modeling each gravity component in the time domain with the Fourier series.