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RADARSAT-2 Wide Ultra-Fine, Wide Multi-Look Fine and Extra-Fine modes are extended swath modes which employ 2-bit Block Adaptive Quantization (BAQ) compression for data downlink rather than 3-bit BAQ which is used for most other RADARSAT-2 modes. This results in a higher level of quantization noise for these extended swath modes. We have developed a method for simulating 2-bit BAQ derived products by decoding 3-bit BAQ encoded data with alternate decode tables. This method was applied to several multitemporal 3-bit BAQ InSAR stacks to generate corresponding simulated 2-bit datasets. These matching datasets were processed in parallel using Homogenous Distributed Scatterer (HDS)-InSAR to derive multitemporal surface deformation estimates. A comparison of both intermediate and final deformation estimates show substantially similar results with the exception of low backscatter distributed targets such as asphalted surfaces in urban settings.

Impact of BAQ level on InSAR performance of RADARSAT-2 extended swath beam modes.