CASSIOPE orbit and attitude determination using commercial off-the-shelf GPS receivers

Montenbruck, Oliver; Hauschild, André; Langley, Richard B.; Siemes, Christian

doi:10.1007/s10291-019-0907-2

Cited by 17 publications

(11 citation statements)

References 21 publications

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“…Preliminary analysis suggests that the accuracy of the ephemeris is comparable to the values determined by Montenbruck et al (2019). The daily attitude files are in CDF format and contain the q ITRF→CRF quaternions, and the daily ITRF position files are in SP3 format, which is a precise ephemeris format developed by the National Geodetic Survey to store orbit information.…”

Section: Attitude Selection and Reference Field Rotationmentioning

confidence: 87%

In situ calibration of the Swarm-Echo magnetometers

Broadfoot

Miles

Holley

et al. 2022

Geosci. Instrum. Method. Data Syst.

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Abstract. CASSIOPE/e-POP, now known as Swarm-Echo, was launched in 2013 to study polar plasma outflow, neutral escape, and the effects of auroral currents on radio propagation in the ionosphere. The e-POP suite contains an array of eight instruments, including two fluxgate magnetometers on a shared boom. Until now, the two magnetometers relied on a set of preflight calibrations, which limited the accuracy of the magnetic field product and the magnetometers' utility for some applications. Here we present the results of an in situ calibration performed on data from 3 January 2014 to 30 January 2021 and a case study showing the improvements the calibration has made to the data utility. Periodic vector–vector calibration using the CHAOS magnetic field model results achieves an estimated root-mean-square (rms) uncertainty of 9 nT during nominal operation. This data product is now openly available through the ESA Swarm repository.

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Section: Attitude Selection and Reference Field Rotationmentioning

confidence: 87%

In situ calibration of the Swarm-Echo magnetometers

Broadfoot

Miles

Holley

et al. 2022

Geosci. Instrum. Method. Data Syst.

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“…In this study, the precise orbit solutions computed from Montenbruck et al. (2019) are used. The authors computed the precise positions and velocities at a second interval in a reduced‐dynamic approach with float‐ambiguity estimation.…”

Section: Methodsmentioning

confidence: 99%

“…Positioning errors are within the range of a few decimeters and a few millimeters for individual pseudorange and carrier phase measurements, respectively. In this study, the precise orbit solutions computed from Montenbruck et al (2019) are used. The authors computed the precise positions and velocities at a second interval in a reduced-dynamic approach with float-ambiguity estimation.…”

Section: Density Estimation From Cassiope Gnss Precise Orbitsmentioning

confidence: 99%

Thermospheric Mass Density Disturbances Due to Magnetospheric Forcing From 2014–2020 CASSIOPE Precise Orbits

Calabia

Jin

2021

JGR Space Physics

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Long‐term thermospheric mass density disturbances due to magnetospheric forcing are not clear due to a lack of measurement data and imprecise models. In this study, the Global Navigation Satellite System (GNSS) precise orbits of CAScade SmallSat and IOnospheric Polar Explorer (CASSIOPE) are used to infer high‐resolution thermospheric mass densities between the years 2014 and 2020. The CASSIOPE densities are comprehensively validated at altitudes from 325 to 425 km at intervals of 25 km with the High Accuracy Satellite Drag Model (HASDM) density database, and further compared with the Naval Research Laboratory Mass Spectrometer and Incoherent Scatter Radar Exosphere/2000 (NRLMSISE‐00) and the Jacchia‐Bowman/2008 (JB2008) empirical models. The CASSIOPE densities are very similar to the HASDM and JB2008 densities, while the NRLMSISE‐00 largely overestimates (∼150%) during low solar‐flux conditions. For density values above ∼10−12 kg/m3, the correlation of CASSIOPE with HASDM is ∼5% better than the models, and the standard deviation is within 10% of the background density. For density values below ∼10−12 kg/m3, systematic errors have shown to reduce the precision of the CASSIOPE densities. By setting geomagnetic contributions to zero in the models, the density disturbances due to magnetospheric forcing are isolated from the CASSIOPE time‐series, allowing investigation into the correlations and time‐delay responses to the models and to the merging electric field (Em). A new linear dependence of the time delay to the Em was found and then parameterized in this study. Time delays occurred at the 4–7 h range during geomagnetic storms, and at 9–11 h during quiet conditions; neither had significant dependence on altitude. The results represent the validation of the first high‐resolution thermospheric mass density estimates inferred from commercial‐off‐the‐shelf GNSS receivers.

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“…The RRI boresight (perpendicular to the plane of the RRI dipoles away from the satellite) was in the ram direction of the satellite. The attitude uncertainty was 0.06°–0.1° as only a single star sensor was locked (Montenbruck et al., 2019).…”

Section: Data Set and Ray Trace Model Inputsmentioning

confidence: 99%

Polarization Characteristics of a Single Mode Radio Wave Traversing Through the Ionosphere: A Unique Observation From the RRI on ePOP/SWARM‐E

et al. 2022

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The polarization characteristics of radio waves traversing the ionosphere can be determined using the cross‐dipole antennas of Radio Receiver Instrument (RRI) onboard the Enhanced Polar Outflow Probe payload on the CAScade, Smallsat, and Ionospheric Polar Explorer/Swarm‐E satellite. Numerous coordinated ground‐RRI transionospheric propagation experiments have been executed, with the present study using transmitted radio waves from a High Frequency (HF) ground transmitter located in Ottawa, Canada (45.41°N, 75.55°W). Most of these experiments have shown the HF radio waves to propagate with both magnetoionic propagation modes, the O‐ and X‐modes, combined. However, the coordinated ground‐RRI experiment on 12 May 2017 showed only one magnetoionic propagation mode. The observed polarization state had a stable orientation angle, but the ellipticity angle changed from −19° to linear (0°) and finally 30° within a latitude span of 15°. A detailed investigation using magnetoionic ray trace modeling and ground‐based ionogram observations revealed that the HF transmitted frequency and ionospheric conditions were such that only the O‐mode radio waves reached the satellite for the entire pass. This distinct observation is a unique opportunity to examine the radio wave polarization state during a transionospheric propagation of only O‐mode waves.

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CASSIOPE orbit and attitude determination using commercial off-the-shelf GPS receivers

Cited by 17 publications

References 21 publications

In situ calibration of the Swarm-Echo magnetometers

In situ calibration of the Swarm-Echo magnetometers

Thermospheric Mass Density Disturbances Due to Magnetospheric Forcing From 2014–2020 CASSIOPE Precise Orbits

Polarization Characteristics of a Single Mode Radio Wave Traversing Through the Ionosphere: A Unique Observation From the RRI on ePOP/SWARM‐E

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