GPS radio occultation technique has been developed resulting from remote sensing applications in planetary atmospheric limb sounding pioneered by JPL and Stanford University in 1960s. Since the launch of the experimental satellite MicroLab1 on April 3 1995, the primary results from this Low Earth orbiter (LEO) satellite demonstrated potential scienti:c values and practical signi:cance of this i...

Multipath propagation in the lower troposphere plays a very important role in forming the structure of radio signals used for radio occultations. Processing radio occultation data in multipath regions requires the solution of the problem of the reconstruction of the ray structure of a wave eld. Two methods were formerly suggested for processing multipath data: back-propagation and radio-optic (...

However, many existing diagnostics for the tropical belt edge latitudes are subjective, with trends in the width of the tropical belt sensitive to the value of the parameters chosen. Further, it is unknown if widely-used reanalysis products reliably capture the seasonal cycle and interannual variability of the width of the tropical belt. Unfortunately, the dearth of wind observations in the tro...

The ‘statistically optimal’ approach to smoothing bending angles derived from radio occultation (RO) measurements is outlined. This combines a measured bending angle profile with an a priori or background estimate derived from climatology, in order to obtain the most probable bending angle profile. However, the method is only optimal if the error statistics of both the measured and background p...

Introduction Conclusions References

The space-based GPS limb sounding, conventionally known as GPS Radio Occultation, is a remote sensing technique aiming at characterize the Earth atmosphere. The atmospheric profiling is done through the inversion of excess-phase measurements carried-out by a GPS receiver placed on-board a LEO (Low Earth Orbit) satellite. The GPS signal, observed when it emerges from the Earth limb, is refracted...

We present the occultation observation of compact radio source B0019−000 through the plasma tail of comet SchwassmannWachmann 3-B. The observation was made with the Ooty Radio Telescope at 326.5 MHz on 2006 May 26, when the plasma tail of the comet was in front of this source. The scintillation was found to be increased significantly for the target source compared to that of a control source. T...