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FINAL YEAR PROJECTS IEEE PROJECTS 2013-2014 CONTACT: 9940098300, 9500075001 E-Mail:zebrosprojects@gmail.com
Office Address: No 4 / Flat No 3D, Sai Kiran Apts, First Main Road, Kasturba Nagar, Chennai-20 web: www.zebros.in e mail : zebrosprojects@gmail.com mob: 99400 98300,9500075001
ZEBROS PROJECTS MONITORING THE MARINE ATMOSPHERIC REFRACTIVITY PROFILES BY GROUND-BASED GPS OCCULTATION ABSTRACT GPS radio occultation has proved to be a powerful tool for remotely sensing the Earth’s neutral atmosphere and ionosphere. We propose a novel approach to retrieving marine tropospheric profiles based on single ground-based GPS occultation observations. A new retrieval method uses the data from a ground-based receiver while the GPS satellites rise or set at the local horizon in the direction of the ocean. The GPS L1 amplitude signals with negative elevation angles are used to retrieve the atmospheric refractivity by artificial neutral networks. The inversion profiles are very consistent with the radiosonde observations. The new method outperforms the Hopfield model, particularly at 0.5–5-km altitude. These results validate the feasibility of retrieving the lower marine atmospheric refractivity from GPS data collected by a single ground-based receiver near the sea surface.
EXSITING SYSTEM In spite of the promise of the technique, recent studies have found that spacebased GPS occultation has poor precision in lower tropospheric studies particularly when a super-refraction (SR) layer exists. Unfortunately, a global climatology analysis from the European Centre for Medium-Range Forecasts indicates that SR occurs in marine areas quite frequently. The observational errors of the refractivity from spacebased occultation show a nearly linear decrease with height in the troposphere and a slight increase above the tropopause.
Office Address: No 4 / Flat No 3D, Sai Kiran Apts, First Main Road, Kasturba Nagar, Chennai-20 web: www.zebros.in e mail : zebrosprojects@gmail.com mob: 99400 98300,9500075001
ZEBROS PROJECTS Compared with space-based GPS occultation, monitoring the lower atmospheric refractivity profiles using ground-based receivers is potentially more available in specific interest areas for regional weather and climate studies. However, attempts to profile the refractivity from ground-based GPS measurements are relatively rare, primarily because of the limitation of the geometry of the source–receiver, which invalidates the Abel transform based on the phase delay measurements. PROPOSED SYSTEM We propose a new approach of retrieving the lower atmospheric refractivity profiles using coastal ground-based GPS RO amplitude data. The new method is based on a coastal experiment with a period of one year and the technique of neural networks. The first results show good performance for lower atmospheric refractivity profiles compared with radiosonde observations. The vertical refractivity profile is retrieved under the assumption of local horizontal homogeneity of refractivity along the propagation path. This technique has the advantage of being independent of the precise phase measurement, high precise orbit determination, or dual frequency, which is needed in space-based occultation using the Abel transform. The results confirmed that the RO amplitude signals received by a single ground-based receiver are sensitive to the vertical refractivity gradients, which are commonly large in the lower troposphere. These signals can be used to reconstruct the marine atmospheric environments. In space-based GPS occultation, the strong variation of the RO signals can cause significant errors or loss of lock in a GPS receiver operating in phase-locked loop mode. The proposed approach may allow more robust reconstruction of the low atmospheric refractivity structure by the open-loop RO.
Office Address: No 4 / Flat No 3D, Sai Kiran Apts, First Main Road, Kasturba Nagar, Chennai-20 web: www.zebros.in e mail : zebrosprojects@gmail.com mob: 99400 98300,9500075001
ZEBROS PROJECTS BLOCK DIAGRAM CONTACT: ZEBROS PROJECTS PHONE: 9940098300, 9500075001 DESCRIPTION GPS RADIO occultation (RO) has been exploited to obtain the Earth’s atmospheric profiles for about two decades. In this method, the extra phase delay is collected by a receiver in low-Earth orbit tracking a GPS satellite while it is setting or rising behind the Earth’s limb. The atmospheric bending angle deduced from the measured extra phase delay can then be converted into a refractivity profile through the Abel transform. The profile can be also obtained by neural networks based on spacebased GPS RO data. Space-based GPS occultation has the advantages of providing a globally distributed set of high-resolution atmospheric profiles, suggesting that the technique will contribute to global weather forecasting The antenna is at an altitude of 15 m above mean sea level, with its bore sight along the horizon direction. The lowest elevation was set to −10◦. Data can be collected at both negative and positive elevation angles relative to the local horizon when GPS satellites set or rise behind the Earth’s limb in the direction of the ocean. We propose a new method of ground-based GPS RO to remotely sense the refractivity profiles of the troposphere. The proposed approach assumes a horizontal stratified atmosphere, which means vertically homogeneity of refractivity along the propagation path. It is desired to assess the feasibility of monitoring the lower marine atmospheric profiles using the amplitude signals.
Office Address: No 4 / Flat No 3D, Sai Kiran Apts, First Main Road, Kasturba Nagar, Chennai-20 web: www.zebros.in e mail : zebrosprojects@gmail.com mob: 99400 98300,9500075001
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Office Address: No 4 / Flat No 3D, Sai Kiran Apts, First Main Road, Kasturba Nagar, Chennai-20 web: www.zebros.in e mail : zebrosprojects@gmail.com mob: 99400 98300,9500075001
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Office Address: No 4 / Flat No 3D, Sai Kiran Apts, First Main Road, Kasturba Nagar, Chennai-20 web: www.zebros.in e mail : zebrosprojects@gmail.com mob: 99400 98300,9500075001
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Office Address: No 4 / Flat No 3D, Sai Kiran Apts, First Main Road, Kasturba Nagar, Chennai-20 web: www.zebros.in e mail : zebrosprojects@gmail.com mob: 99400 98300,9500075001