Abstract:
Geosynchronous orbit (GEO) satellites are widely used in communications and navigation fields due to their special properties, such as comprehensive ground coverage and f...Show MoreMetadata
Abstract:
Geosynchronous orbit (GEO) satellites are widely used in communications and navigation fields due to their special properties, such as comprehensive ground coverage and fixed subsatellite trajectories. The safety of GEO satellites can be ensured by using space-borne inverse synthetic aperture radar (SBISAR) to achieve high-precision observations or monitoring of uncatalogued targets near the GEO satellites. However, the amount of echo data is significant due to the slow relative motion between the GEO targets and SBISAR during long coherent processing intervals (CPIs). In this work, a variable sampling start echo receiving method is proposed to reduce the amount of redundant echo data, and the timing which combining the radar tracking with imaging is designed. First, the Earth center inertial (ECI) coordinate position vectors of the GEO target can be obtained through the monopulse method and coordinate transformation. Second, the initial orbit parameters of the GEO target are established by the Gibbs method. Third, the slant range of the GEO target is obtained by the interacting multiple model (IMM). Finally, the slant range is used to design the sampling start of the echo window and the timing of tracking imaging integration. Taking GEO satellite imaging as an example, experiments based on simulation data verify the effectiveness of the proposed method.
Published in: IEEE Geoscience and Remote Sensing Letters ( Volume: 22)