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# System prepended metadata

title: Fringe 2023 abstract

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# Fringe 2023 abstract

### Section: Atmosphere, Ionosphere & InSAR Meteorology

**Title:** Mitigation of ionospheric signal over Chile
**Authors:** RB,FL,YMA,ML,JE,AH,TW..
**Type:** poster (?)

Effect of ionosphere on interferometric phase has been already well documented, together with its impact on time series. We revisited Sentinel-1 InSAR time series over Chile where we estimated and removed phase due to ionospheric fluctuations using split-spectrum method. While the accuracy was significantly improved for ascending track, the method introduced errors that decreased accuracy of descending track time series. This contribution investigates application of external ionospheric models of CODE and IRI2016.

Additionally, we use the Extended Timing Annotation Dataset (ETAD) provided by the ESA to apply the timing corrections. We specifically use the annotated range delays which were converted to phase offsets to derive phase screens between two repeat pass acquisitions specifically to account for tropospheric and ionospheric effects. We apply the corrections to all interferometric pairs that we used in our time-series analysis. 

We finally compare the performance of the ionospheric corrections (slit-spectrum method, the external ionospheric models and the ETAD approach) on time series inversion using NSBAS method over north of Chile for a period of 4 years.

