Abstract
Under contract to the Canadian Space Agency and in cooperation with the Canadian Department of National Defence, MacDonald Dettwiler and Associates Ltd. will include an experimental ground moving target detection function in RADARSAT-2. The RADARSAT-2 design allows two portions of the full antenna aperture to be used independently with two separate receivers. This configuration provides a temporal (along-track) interferometer (ATI) capability. By appropriate processing of the received echo data from the two apertures, it is possible to detect targets that have a radial motion component and to measure their radial velocities. This element of the RADARSAT-2 spacecraft and ground system design is known as the moving object detection experiment (MODEX). Ongoing research into the properties of unscanned synthetic aperture radar (SAR) ground moving target indication (SAR GMTI) sensors of the RADARSAT-2 class has identified a number of features that are unique to SAR GMTI processing requirements. This paper describes the capabilities of RADARSAT-2 that are relevant to moving target detection and defines moving target detection modes of operation. Potential signal processing algorithms and issues that must be considered in the design of MODEX data processing facilities are introduced. A preliminary conceptual design for a MODEX processor is outlined.
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