This page presents relevant documentation for end-user either to assess the performance of the Sentinel-1 mission instrument and products.
Those reports provide the status of Sentinel-1 mission instrument and product performance for the successive years of operations.
The N-Cyclic Performance Reports provide information on product performance on period covering currently 4 cycles. Those reports are available in the Sentinel-1 SAR Document Library here: Sentinel-1 SAR Document Library
They provide interim reporting on product performance between the publication of annual performance reports that contain much more information. Once an annual performance report is available, the N-Cyclic Performance Report covered by the year are then unpublished.
A set of Quality Disclaimers are available on this web site in the Quality Disclaimers section.
The quality disclaimers provide description of the product performance degradation together with information on how to segregate the impacted products (by SAR unit, acquisition time, generation time, etc).
The quality disclaimers contain a "percentage of degradation" of the impacted products. This percentage is an empirical estimation of the level of degradation, considering that a given degradation may have different impact on different users and their specific applications. It does not necessarily relate to the amount of products degraded. The following rule of thumb is used:
Certain quality disclaimers correspond to reporting of specific product degradation on a given period. For instance, invalid annotation of burst ID on TOPS SLC products on a given cycle or product products containing residual RFI in a given month. In those cases, in addition to the "percentage of degradation" field, the quality disclaimer also contains the percentage of impacted products with respect to the total number of products of same processing level in the same period.