Spin rate estimation of sounding rockets using GPS wind-up |
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| Authors: | M García-Fernández M Markgraf O Montenbruck |
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| Institution: | 1.German Aerospace Center (DLR)/German Space Operations Center (GSOC), Oberpfaffenhofen,We?ling,Germany |
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| Abstract: | Carrier phase wind-up is a well-known effect that arises from the relative rotation between a transmitting and receiving antenna.
In GPS measurements at L1 frequency, this effect translates into an error of 19.029 cm per full relative rotation of antennas.
Since this effect is independent of the satellite elevation for pure rotation about the antenna boresight axis, it is usually
absorbed by the clock estimation in navigation algorithms. Therefore, the impact of wind-up is usually neglected for applications
that do not require accuracies to the cm level like RTK. However, in receiving platforms with high rotation rate, the accumulated
wind-up value can be important and actually be larger than receiver noise or even ionospheric variations. Therefore, in such
scenarios, the wind-up contribution can be isolated and used as a source of information to compute the spin rate of such platforms
using an appropriate combination of GPS observables. This work shows some results of a coarse, yet simple, approach to monitor
the rotation angle and spin-rate of spin stabilized sounding rockets flown by DLR. |
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| Keywords: | GPS Carrier-phase Phase wind-up Receiver noise Ionosphere Sounding rockets |
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