Correction Method for Digital Beamforming in the Range-Doppler Domain for Tandem Bistatic SAR

This paper investigates a correction method for digital beamforming (DBF) based on tandem bistatic Synthetic Aperture Radar (SAR). Due to its unique geometric configuration and electromagnetic characteristics, the tandem bistatic SAR system offers significant advantages in enhancing resolution and target recognition capabilities. However, traditional DBF techniques encounter performance limitations when processing elevation-direction signals in tandem bistatic SAR systems. To address this issue, the paper first analyzes the imaging principles and characteristics of the tandem bistatic SAR system, and then establishes a linear approximation model for the relationship between point target azimuth angles and transmitter-receiver distances, providing a theoretical foundation for DBF correction. A range-Doppler domain DBF processing method is introduced to enhance elevation-direction signal processing performance. Simulation experiments confirm the effectiveness of the proposed approach.