Attema, Evert; Snoeij, Paul (European Space Agency, Noordwijk, The Netherlands)
Guarnieri, Andrea Monti; Rocca, Fabio (DEI, Politecnico di Milano, Milano, Italy)
Guccione, Pietro (DEE, Politecnico di Bari, Bari, Italy)
D’Aria, Davide (Aresys srl, Milano, Italy)
Croci, Renato; Olanda, Andrea (Thales Alenia Space Italia, Rome, Italy)
The variable bit rate coding scheme designed for Sentinel-1 and named Flexible Dynamic Block Adaptive Quantizer (FDBAQ) is presented in this paper. FDBAQ technique adapts the number of quantization bits according to a local estimate of the signal-to-noise ratio (SNR) at the receiver. Its performance is shown to be superior to the currently used BAQ compressor in terms of SNR related to the compression rate. An overview of the design optimization, of the on-board and on-ground operations and of the system performances is provided. Results of simulations have been based on a 16-bit mosaic of reflectivity in C-band based on ENVISAT Global Monitoring data.