By Ludwig Grunwaldt, Thomas K. Meehan (auth.), Professor Dr. Christoph Reigber, Professor Dr. Hermann Lühr, Dr. Peter Schwintzer (eds.)
In the summer time of 2000 the German geo-research satellite tv for pc CHAMP used to be embarked on orbit. Its leading edge payload association and the low intial orbit enable CHAMP to at the same time gather and virtually consistently examine exact info when it comes to gravity and magnetic fields at low altitude. as well as this CHAMP additionally measures the impartial surroundings and ionosphere utilizing GPS techniques.
Eighteen months after the release, CHAMP study teams from world wide met on the Geo-Forschungs-Zentrum in Potsdam for an preliminary trade of reviews and effects. the most final result of this consumer assembly is summarized during this quantity. except technical information regarding the project, the ebook bargains a entire perception into the current prestige of CHAMP facts exploitation for Earth method study and sensible functions in geodesy, geophysics and meteorology.
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Extra resources for First CHAMP Mission Results for Gravity, Magnetic and Atmospheric Studies
Table 1 gives the results. Note the sigma of the mean is a 'formal' one, the actual uncertainty may be a few times larger. From this table one can see that: 1) the mean residual (systematic error) is not very large (not as in the case of GPS 35 and 36, which is around 5 cm); 2) no matter what arc length was used, which GPS orbits were fixed, the mean residuals have no substantial differences. 15 Table 1. Mean residual of SLR fit to CHAMP orbits (in em) 40 Chuang Shi et al The daily (or each 2-d arc) estimates of the antenna offset in the radial direction are listed in Table 2.
2. As expected, the highest amplitudes are observed in the along track direction (X4, X5). Spikes in the signal are caused by thruster activities. 3 Accelerometer Coupling with Heater Activities All three accelerometer control circuits in radial direction are affected by the accelerometer temperature control. As example the pitch angular acceleration signal is discussed. The heater activities around the accelerometer are shown in the upper part of Fig. 3. A strong correlation between the accelerometer temperature control and the accelerometer angular acceleration output was detected.
96 EGI"V'I9S vS C H A f V 1 P _ A C C 3 B 2 S ( T N ) vs CHAI\IIP-ACC:: vs 3 B 2 S ( A T ) Fig. 4. ________ .. ~ ____ .. 97 Table 3. Orbit fit comparison (em) 5 Conclusions The CHAMP accelerometer calibration parameters were estimated from acceleration comparisons, dynamic orbit adjustment and gravity solution using GPS and accelerometer observations. The following conclusions can be drawn: • The initial accelerometer biases can be obtained through comparison of observed accelerations with the accelerations computed using models.
First CHAMP Mission Results for Gravity, Magnetic and Atmospheric Studies by Ludwig Grunwaldt, Thomas K. Meehan (auth.), Professor Dr. Christoph Reigber, Professor Dr. Hermann Lühr, Dr. Peter Schwintzer (eds.)