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Magnetic gradiometry using frequency-domain filtering
Russell, Christopher T.; Raymond, Carol A.; Polanskey, Carol A. +7 more
Accurate measurements of ambient planetary and interplanetary magnetic fields using spacecraft magnetometers typically require accounting for interfering magnetic fields generated by the flight system (FS). The most common method for removing FS-generated time-variable magnetic fields is narrow-band and low-pass filtering of magnetic field data in…
A GPU-based phase tracking method for planetary radio science applications
Yan, Jianguo; Barriot, Jean-Pierre; Wang, Guangli +3 more
This paper introduces a phase tracking method with a computational algorithm for planetary radio science implemented on NVIDIA GPUs. In contrast to the phase-locked loop phase counting method used in traditional Doppler data processing, this method fits the tracking data with optimal parameters into the shape expressed by Taylor expansion. The dif…
A real-time, high-accuracy, hardware-based integrated parameter estimator for deep space navigation and planetary radio science experiments
Liu, Wei; Wang, Zhen; Jian, Nianchuan +9 more
Real-time, high-accuracy frequency-phase estimation is the critical mission of Doppler tracking, which is a primary technique for deep space spacecraft navigation and planetary radio science experiments. Usually, the analog intermediate frequency signal is digitalized and converted to baseband by signal processing hardware platforms called digital…
In-flight calibration of the spin axis offset of a fluxgate magnetometer with an electron drift instrument
Russell, C. T.; Torkar, K.; Leinweber, H. K.
We show that the spin axis offset of a fluxgate magnetometer can be calibrated with an electron drift instrument (EDI) and that the required input time interval is relatively short. For missions such as Cluster or the upcoming Magnetospheric Multiscale (MMS) mission the spin axis offset of a fluxgate magnetometer could be determined on an orbital …
Electron optical study of the Venus Express ASPERA-4 Electron Spectrometer (ELS) top-hat electrostatic analyser
Kataria, D. O.; Barabash, Stas; Coates, Andrew J. +6 more
The performance of the Venus Express (VEX) ASPERA-4 Electron Spectrometer (ELS) is different from the nominal response shown by the ASPERA-3 ELS aboard Mars Express due to machining tolerance. Up to now, the precise mechanism for this was unknown and, therefore, the results of the experimental calibration could not be supported with a theoretical …