CONSERT line-of-sight link budget simulator

Hahnel, Ronny; Hegler, Sebastian; Statz, Christoph; Plettemeier, Dirk; Zine, Sonia; Hérique, Alain; Kofman, W.

doi:10.1016/j.pss.2015.03.011

Cited by 5 publications

(5 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We are now starting to update the results presented in Kofman et al (2015) and we expect limited implications on the average permittivity. This improved knowledge of both position and nucleus shape will allow us to study the spatial variability of the permittivity averaged along a propagation pass (Herique et al 1999) and also to model the CONSERT lander antenna pattern to analyse the CONSERT received power (Hahnel et al 2015). This future work is outside the scope of this article.…”

Section: C O N S E Rt 6 7 P / C G P E R M I T T I V I T Y M E a S U R...mentioning

confidence: 99%

Cosmochemical implications of CONSERT permittivity characterization of 67P/CG

Hérique

Kofman

Beck

et al. 2016

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

Analysis of the propagation of the Comet Nucleus Sounding Experiment by Radiowave Transmission (CONSERT) signal throughout the small lobe of the 67P/CG nucleus has permitted us to deduce the real part of the permittivity, at a value of 1.27 ± 0.05. The first interpretation of this value, using the dielectric properties of mixtures of ices (H 2 O, CO 2 ), refractories (i.e. dust) and porosity, led to the conclusion that the comet porosity lies in the range 75-85 per cent. In addition, the dust-to-ice ratio was found to range between 0.4 and 2.6 and the permittivity of dust (including 30 per cent porosity) was determined to be lower than 2.9. This last value corresponds to a permittivity lower than 4 for a material without any porosity. This article is intended to refine the dust permittivity estimate by taking into account updated values of the nucleus densities and dust/ice ratio and to provide further insights into the nature of the constituents of comet 67P/CG. We adopted a systematic approach: determination of the dust permittivity as a function of the volume fraction of ice, dust and vacuum (i.e. porosity) and comparison with the permittivity of meteoritic, mineral and organic materials from literature and laboratory measurements. Then different composition models of the nuclei corresponding to cosmochemical end members of 67P/CG dust are tested. For each of these models, the location in the ice/dust/vacuum ternary diagram is calculated based on available dielectric measurements and confronted to the locus of 67P/CG. The number of compliant models is small and the cosmochemical implications of each of them is discussed, to conclude regarding a preferred model.

show abstract

Section: C O N S E Rt 6 7 P / C G P E R M I T T I V I T Y M E a S U R...mentioning

confidence: 99%

Cosmochemical implications of CONSERT permittivity characterization of 67P/CG

Hérique

Kofman

Beck

et al. 2016

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

show abstract

“…j k ðsÞ is the quantity which is relative to the parameters (such as temperature, density and pressure) of the nodes. The basic principle of LOS method [32,33] is that regard the radiative transfer in the medium as one-dimensional radiative transfer problem. That is to say, when the radiation LOS which parallels to the detection direction intersects with flow field, LOS will transmit continually until meeting the engine components.…”

Section: Basic Principle Of Los Methodsmentioning

confidence: 99%

Three-dimensional imaging simulation of active laser detection based on DLOS method

Zhang

Zhou

Chen

et al. 2016

Infrared Physics & Technology

View full text Add to dashboard Cite

“…OCN is made of two pairs of two cross dipoles, also providing a left-handed elliptic polarized wave 9 . When nominally landed, which was, unfortunately, definitely not the case for the 2014 landing 10 , the main part of the LCN transmitted signal power is directed to the ground, due to coupling with the ground and the platform structure 11 . This ensures the best link budget during the science operations when penetrating through the comet nucleus, but makes this link more difficult when OCN and LCN are operated in visibility.…”

Section: Consert Functioning and Operationmentioning

confidence: 99%