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This paper proposes a position and attitude observer based on INS and GPS. Design and test results of an adaptive dual-rate Extended Kalman Filter(EKF) estimator for fusing data from Global Positioning Systems (GPS) and an Inertial Navigation System (INS) in order to estimate the position, velocity, and attitude. The dual-rate EKF consists of a high-speed filter and a low-speed filter, the high-speed...
Remote sensing using global navigation satellite system reflection signals (GNSS-R) is a new active microwave remote sensing technology. The sensitivity of power waveform to ocean surface wind speed and direction is researched at aircraft altitude in this papar, which bases on numerical simulations of GNSS-R waveform. The results show the peak and slope of waveform is sensitive to the wind speed and...
A PPP algorithm based on original dual-frequency GPS code and carrier-phase observations was presented. By take full advantage of the dispersive nature of ionospheric delay, the new PPP algorithm estimate it along with some other parameters such receiver position, clock bias, and zenith tropospheric delay. This alternative algorithm could avoid the adverse effect of amplified multipath and measurement...
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