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2 Averaged Surface Weather Parameters for DSS ll
5 Electron density at 1 AU from dualfrequency experirnental
Mars Pathﬁnder Mission
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algorithm components computed convergence coordinate frame covariance matrix data points deﬁned Doppler Doppler measurement Earth orientation elevation angle encounter plane Encounter Results epoch error budget error covariance error ellipse error sources estimation error ﬁle Filter ﬁnal ﬁrst geocentric heliocentric heliocentric conic included ionosphere Kalman ﬁlter linearized longitude Mars Pathﬁnder mbar Measurement and NGA Measurement and SRP measurement noise parameter measurement partials method Monte Carlo Results navigation NGA Parameters nominal values Nongrav nutation orbit determination Parameters Adapted Doppler partial derivatives perturbation and error plot in Figure pole motion position and velocity process noise proﬁle propagation Q Q Q Q Q Q range measurement ranging data right ascension scaling factors semimajor axis shown in Figure signiﬁcant error simulation solar pressure solar radiation pressure spacecraft speciﬁed SRP Parameters Adapted station location tracking station transition matrix troposphere unit vectors UTC days Weighting Coefﬁcients weighting factors weights for ﬁlters