Abstract
This article analyzes the potential synergies between the two German satellites of the TerraSAR-X/TanDEM-X (TSX/TDX) mission and the Spanish PAZ satellite. Since both platforms are almost identical and they were launched in the same orbital plane, comparable images of the same area under the same geometry may be regularly acquired by both systems. This allows the simultaneous exploitation of both missions for building larger time series and improving the revisit time of 11 days for each mission up to 4 or 7 days while combining both. The geometric accuracy and the interferometric performance when combining both sensors are investigated, considering different acquisition parameters and land cover types. For this article several images are acquired over German and Spanish calibration test sites. The results obtained when combining acquisitions from satellites of the TSX/TDX and PAZ missions show no loss of performance with respect to image pairs of the same satellite, indicating that both missions might be exploited synergistically in order to improve current monitoring applications or maybe to allow newer application with tighter requirements in terms of revisit time or temporal coverage. In order to explore all these possibilities, a call for scientific proposals will be jointly opened by the coordinators of the scientific activities of both missions in order to explore the simultaneous exploitation of TSX/TDX and PAZ data.
Highlights
T HE main objective of this article is to analyze the interoperability between sensors from a scheduled experiment between TerraSAR-X/TanDEM-X (TSX/TDX) [1], [2] and PAZManuscript received November 5, 2020; revised February 15, 2021; accepted May 1, 2021
Depending on the repeat time in relation to the changes occurring on the surface the interferometric coherence shows a fast decay and is decorrelating such that no reliable information can be retrieved from the interferometric coherence as well as the interferometric phase
The second satellite, TDX, launched June 21, 2010, is a rebuild of TerraSAR-X satellite (TSX) with only minor modifications like an additional cold gas propulsion system for formation fine tuning, double-sized on-board solid-state memory for increased data recording capacity, and an additional S-band receiver to enable the reception of telemetry and GPS position information broadcast by TSX
Summary
T HE main objective of this article is to analyze the interoperability between sensors from a scheduled experiment between TerraSAR-X/TanDEM-X (TSX/TDX) [1], [2] and PAZ. Depending on the repeat time in relation to the changes occurring on the surface the interferometric coherence shows a fast decay and is decorrelating such that no reliable information can be retrieved from the interferometric coherence as well as the interferometric phase. The main objective of this study is to assess the performance of the interferometric coherence and phase when combining TSX/TDX and PAZ acquisitions in terms of stability and accuracy. For this an own experiment was conducted over two main calibration sites, where calibration devices have been used to quantify the performance of the observables, the location and radiometric accuracy. The experiment, the data and the assessment are presented
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