Channel Imbalance Calibration for Digital Beamforming SAR System in Elevation
摘要
Digital beam forming (DBF) synthetic aperture radar is an important technological approach for achieving high-resolution and wide-swath imaging. However, the unavoidable channel mismatch among received channels is a key issue. Channel imbalance deserves special attention in DBF system since the uncompensated channel errors may cause sidelobes rising, time-variant shift, a broadening of the impulse response, as well as the error of beam-steering direction. Thus, this letter addresses the impact of channel mismatching errors for digital beamforming (DBF) system in elevation and proposes a high accurate calibration method. Simulation experiment shows the effectiveness of the proposed method.