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SAR interferometry is a well-known technique to produce digital surface models (DSM). In the global scale, the quality of these models significantly increased with the use of bistatic systems as for the TanDEM-X mission. DSM uncertainty can be measured in two scales: a global and a local one. A global scale analysis involves measures for the complete take, characterizing the whole correctness with...
In this letter, the suitability of alternating bistatic (AB) TanDEM-X data for tomographic processing is demonstrated. The AB acquisition mode allows to acquire data from three different phase centers at the same time by means of a single pass of the TSX-1 and TDX-1 satellites. The channels of an AB acquisition present no temporal decorrelation within them. In addition, the atmospheric delay can be...
Spectral estimation is considered in the paper as an additional instrument towards a better understanding of the physical phenomena behind the layover scattering decomposition. A super-resolution technique is employed to derive the fringe frequencies characterizing the layover portion. Due to the limited estimation support, only the dominant frequency is found to be reliable information. The non-linear...
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