A Novel Joint Dimensionality-Reduced Adaptive Clutter Suppression Method for Space-Based Early Warning Radar Utilizing Frequency Diversity Array

Due to the platform characteristics of space-based early warning radar (SBEWR), the system exhibits a high degree of freedom (DOF) in receiving sea and ground clutter, which complicates the achievement of adequate adaptive clutter suppression performance. To address this challenge, this article proposes a joint dimensionality-reduced adaptive clutter suppression method based on a frequency diverse array (FDA) for SBEWR. First, a pulse parameter joint design scheme tailored to FDA-SBEWR is introduced, which mitigates the impact of range ambiguity on received clutter. Second, a joint dimensionality-reduced structure design method is developed, focusing on received clutter data. This approach significantly reduces the computational resource demands of the adaptive system while satisfying the DOF requirements for signal processing, thereby ensuring excellent clutter suppression performance for SBEWR. The simulation results demonstrate the effectiveness of the proposed method.