Project

SynSent (FFG ASAP-12 ID. 854009)

Updates
0 new
0
Recommendations
0 new
0
Followers
0 new
0
Reads
0 new
2

Project log

Aleksey Sharov
added 2 research items
Three-year-long Sentinel-1-A/B IW SAR time series and timely data recorded at airport meteorological stations were used for the sub-regional analysis of weather-related impacts on the performance of persistent scatterer SAR interferometry (PSI) in European airfields of Longyearbyen, Vienna, Bratislava and Graz. An original correction technique of “better half” was designed and successfully tested on six different runways. The proposed correction lowered the mean influence of local weather on PSI results from approx. 8 mm/a to 2 mm/a. Also the variation of residual errors around zero value was essentially reduced. Typical range shifts between “dry” and “wet” scatterers varied between 0.1 and 0.5 pixel.
Random variations of local weather represent the main limiting factor for practical applications of persistent scatterer interferometry (PSI) at the sub-regional level. 190 Sentinel-1 IW SAR scenes taken over European airfields of Vienna, Bratislava, Graz and Longyearbyen, and timely data recorded at airport meteorological stations were used for the joint interferometric analysis of weather-related impacts on the PSI technique. It was revealed that the most prevalent causes of the weather-related errors were heavy precipitation (50%), strong winds (32%) and thermal effects (8%). Typical range errors due to weather impacts varied between 0.1 and 0.5 pixel. An original correction technique of better half was designed and successfully tested in four lowland test sites. The proposed correction lowered the mean influence of local weather on PSI results from approx. 8 mm/a to 2 mm/a. Also the variation of residual errors around zero value was essentially reduced.