This paper presents a new ship monitoring system developed at GMV Aerospace that integrates the reports provided by the Automatic Identification System (AIS) with ship-related information derived from SAR data analysis. In contrast to other proposals, SAR data is considered here to be the main input whereas AIS polls the supporting channel. The system kernel is built by the combination of three independent modules (coastline isolation, ship detection and ship classification) with two main purposes: to increase system independence and automatism. The former tries to limit the dependence on ancillary information (such as AIS), whereas the latter on human operator intervention. The three modules are integrated in a common framework developed with state-of-the-art web technologies. The result is a new concept for ship monitoring (including automatic SAR-based ship classification) that helps to better locate the error sources and reduce their dispersion. The system is able to ingest any type of SAR data for different modes and resolution, for instance ERS, ENVISAT, PALSAR, RADARSAT series or TerraSAR-X. Obviously, the performance would be strongly related with sensor features, but the system is designed to let single-polarimetric images with medium resolution provide reasonable results. This adds multi-sensor capability, which helps to reduce report refreshing time. In the paper, some examples will be processed and the main results analyzed. Preliminary tests for the ship classification module will be also presented, profiting from the ground-truth included within AIS-reports.
The SPOT follow-on system whose French acronym is 35 (Suite du Systeme Spot) is a new CNES (French Space Agency) Earth Observation program with reduced development cost as a major objective. In order to reach this goal, the new satellite architecture must lead to an important reduction of the mass, the target being around 500kg. The reduced mass of the new instrument, that is the essential part with regard to the image quality performances, will have to be taken into account with the aim ofusing as much as possible the R&D studies that are in progress.The present paper describes a new concept of instrument. The optical system based on a TMA (Three-Mirror Anastigmat) telescope with 3 .8° Field Of View (FOV) allows the compact architecture necessary to the mass reduction while keeping high performances.The mechanical architecture realises the deportment of the instrument parts that are submitted to the ground and flight environment while keeping stiffness and stability. The pointing system modifies the direction ofthe image acquisitions within a 30°r ange along track and 45° across. The focal plane is composed of two sensors for the acquisition in one panchromatic and four multispectral bands. The processing electronics converts with a 6 Mpixels/s rate the data to 10 bit words in the entire signal dynamic. Finally, the main performances are shown.
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