In-Orbit Cosmo-SkyMed antenna pattern estimation by a narrowband sweeper receiver

This paper introduces a novel method for antenna pattern estimation in satellites equipped with Synthetic Aperture Radar (SAR), utilizing a Narrowband Sweeper Receiver (NSR). By accurately measuring power across individual frequencies within SAR's inherently broadband spectrum, the NSR significantly enhances antenna pattern extraction accuracy. Analytical models and practical experiments conducted using the Cosmo-SkyMed satellite validate the receiver's performance, demonstrating superior signal-to-noise ratio (SNR) compared to conventional receivers. This research represents a key advancement in SAR technology, offering a robust framework for future satellite calibration and verification methodologies.