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Set-Top-Box Pluviometric Mesh Service

IP.com Disclosure Number: IPCOM000209216D
Publication Date: 2011-Aug-01
Document File: 5 page(s) / 400K

Publishing Venue

The IP.com Prior Art Database

Related People

Nicolas Gaude: AUTHOR

Abstract

Pluviometric services are based on discrete rain-gauge systems spread in the field. It is proven that satellite to earth transmission signal to noise ratio is directly affected by the overall rain activity across the dish to satellite propagation air medium. According to a physical model of signal to noise effect on satellite transmission, the current solution proposes to use numerous satellite set top boxes as individual efficient rain-gauge and provide a high density Pluviometric mesh services built on top of a given satellite set top boxes network.

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Set-Top-Box Pluviometric Mesh Service

Nicolas Gaude May 2011

Abstract

Pluviometric services are based on discrete rain-gauge systems spread in the field. It is proven that satellite to earth transmission signal to noise ratio is directly affected by the overall rain activity across the dish to satellite propagation air medium. According to a physical model of signal to noise effect on satellite transmission, the current solution proposes to use numerous satellite set top boxes as individual efficient rain-gauge and provide a high density Pluviometric mesh services built on top of a given satellite set top boxes network.

The problem

A pluviometer is the best way for meteorological services to capture the daily level rain. Because satellite imaging using IR channel doesn't give enough info on rainfall to get a precise image of rain level on a given country, the meteorological services need to install operate and support a high density of pluviometer spread in the country at a high cost.

The current solution offers a competitive alternative to physical pluviometer using a each STB as a real-time model of pluviometer.

The Solution in Brief

The ~10GHz bandwidth used by satellite to broadcast audio/video stream is highly dependent on the air transmission medium. Research are showing that the dielectric property of the fusion ice/water layer in cloud affects and diminishes the transmission factor of the DVB most commonly used ~10GHz bandwidth. Using a given model of satellite carrier wave propagation through this ice/water layer, characteristic of a rainfall event, we can correlate rainfall to a part of the level of signal attenuation and noise observed on a DVB receiver such as a STB: using real-time AGC (automatic gain control) and BER (bit error rate) available from the STB drivers, we then model for a given couple STB& dish location the rainfall at any time, turning the STB into a virtual pluviometer.

Using a return path, server collects from all STB virtual pluviometer the rainfall data across time and the STB & dish location. Access to the server collection is then sold as a low cost - high density pluviometric service to any meteorological services. FYI, in France the average number of pluviometers operated by www.meteofrance.com is ~10K, where the number of canal satellite subscribers is >>1M.

As an embodiment, the proposed model can be as robust as possible using the high density of STB receivers: reduce earth- earth disturbance (noise) from earth-satellite disturbance (rainfall).

The Solution in Detail Physics

A "hydrometeor" is a cloud that brings rainfall over the ground. The "hydrometeor" activity is measured in mm/h. The physics objective is to establish the relationship between the hydrometeor activity given in mm/h units and the DVB-S signal to noise ration effect given in dB units.

Rain model

To get link between hydrometeor activity and SNR (signal to noise ratio), we need to establish what are the meaningful rainfall c...