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- W2090066430 abstract "An in-flight pointing calibration technique developed for the Viking Orbiter high-gain antenna has been validated through actual flight usage. The desired telecommunications performance dictated that the high-gain antenna pointing error be held at 0.7 deg, which would have been exceeded without calibration. The in-flight calibration methodology required the development of a stochastic model of the spacecraft rotational biases and earth-received signal strength measurements. The signal strength measurements, which were performed at X-band frequency, were used as observations to estimate the rotational biases and their corresponding uncertainties. Reducing the uncertainties of these parameters resulted in increased antenna pointing accuracy. The initial pointing offset was estimated to be in excess of 1 deg, and after in-flight calibration it was reduced to about 0.66 deg. About 50% of the original offset could not be calibrated, thus the improvement on the remaining offset is better than 50%." @default.
- W2090066430 created "2016-06-24" @default.
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- W2090066430 date "1980-09-01" @default.
- W2090066430 modified "2023-09-25" @default.
- W2090066430 title "Viking Orbiter In-Flight Pointing Calibration of the High-Gain Antenna" @default.
- W2090066430 cites W1991481731 @default.
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- W2090066430 doi "https://doi.org/10.2514/3.56018" @default.
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