Radio Science Data Analysis in Venus Express and Rosetta

Name: Radio Science Data Analysis in Venus Express and Rosetta
Brand: Sudwestdeutscher Verlag Fur Hochschulschriften AG
SKU: 9783838128436
Price: 430.4 RON
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Autor: Riccardo Mattei

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Editura: Sudwestdeutscher Verlag Fur Hochschulschriften AG

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The deeper layers of the Venus atmosphere penetrated by the RF carrier signal transmitted by the VEX...

Informații despre carte

Autor

Riccardo Mattei

Limbă

engleză

Legare

Carte - Carte broșată

Publicat

2011

Pagini

300

EAN

9783838128436

ISBN

3838128435

Enbook ID

07007026

Editura

Sudwestdeutscher Verlag Fur Hochschulschriften AG

Greutate

440

Dimensiuni

152 x 229 x 17

Descriere completă

The deeper layers of the Venus atmosphere penetrated by the RF carrier signal transmitted by the VEX spacecraft during the atmospheric sounding can cause SNR degradations exceeding 50 dB along with frequency shifts and shift rates up to, respectively, 60 kHz and 2 kHz/s, depending on the observation geometry. Under such conditions, PLL-based receivers are soon driven in out-of-lock and data acquisition stops. Coherent sampling of the antenna voltage eliminates real-time tracking of the incoming signal, hence committing to proper digital post-processing techniques the possibility to recover the weak RF signal sunk in the wide-band receiver thermal noise. The iterative processing strategy outlined in this work is based on progressive reduction of the signal dynamics, realized by means of numeric down-conversion and low-pass filtering. The estimate of the signal frequency (the looked-for parameter) which drives the numeric mixer becomes more accurate at each iteration step, as the noise bandwidth is reduced. In this way, the limit to the achievable maximum accuracy is only set by the thermal noise at the receiver and the frequency stability of the source.

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Radio Science Data Analysis in Venus Express and Rosetta

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