Research on the Evaluation Mechanism of Spaceborne SAR system to Ground-Based Radar Co-Frequency Interference

Abstract

Synthetic Aperture Radar (SAR) is an active sensor that can be installed on satellites and other flight platforms to observe the earth with high resolution, which is widely used in environmental monitoring, resource surveying, and military applications and so on. It has become a hot issue to evaluate the time-varying interference of spaceborne SAR system for protecting the ground-based radars from harmful interference. This study proposes a co-frequency interference evaluation mechanism of spaceborne SAR systems to ground-based radars. First, the time-probability based interference evaluation threshold is discussed. Second, the algorithms to calculate the power level of the interfering pulsed signal are introduced and the impacts of the key parameters are analyzed. Finally, simulation results of the interference caused by typical domestic and foreign spaceborne SAR systems to China’s ground-based meteorological radars are provided, and the validity of the proposed mechanism is verified.