The development phase of the SAR Interferometer Radar Altimeter (SIRAL) is in progress in Alcatel Space and during year 2003 the Engineering and the Flight Models will be tested before delivery to the Mission Prime ASTRIUM GmbH. This ESA mission, planned for 2004, will be used to estimate -on a global scale-the fluctuations in mass of sea-ice and landice. This paper gives a detailed presentation of the microwave and processing units developed, followed by a survey of the pre-launch performances.Figure 1 : SIRAL Electronic boxes Engineering Model