Estimating the Observation Area of a Stripmap SAR via an ISAR Image Sequence

Abstract

The stripmap mode is a basic and important mode for spaceborne synthetic aperture radars (SARs). Estimating the time-varying area observed by spaceborne SARs operating in stripmap mode is a practical but challenging field of research. In this article, we propose a novel method that parameterizes the time-varying area observed by the spaceborne SAR operating in the boresight stripmap mode into a fixed antenna attitude. Based on the principle of minimizing the dihedral angle between the plane containing the ideal estimated scatterers and the plane containing the actual parabolic antenna edge of a spaceborne SAR, an objective function is established for estimating the area observed by a spaceborne SAR operating in the boresight stripmap mode. Then, simulation experiments are designed to validate the feasibility and the robustness of the proposed method. The experimental simulation results show that the proposed method is feasible, and even under low signal-to-noise ratio (SNR) conditions of 10 dB, the proposed method still has good robustness.

A Novel Real-Time Processing Wideband Waveform Generator of Airborne Synthetic Aperture Radar

“…Synthetic aperture radar (SAR) serves as a highly influential and widely used remote sensing system, functioning as a high-resolution microwave imaging radar capable of operating nearly full-time and in almost all weather conditions [1][2][3]. As a significant approach to aerial remote sensing, airborne SAR is extensively utilized in Earth observation, environmental monitoring, strategic target surveillance, disaster monitoring, ground moving target indication (GMTI), and other applications [4][5][6][7]. To obtain high-resolution and wide-swath (HRWS) images, SAR typically transmits a linear frequency modulation (LFM) signal and implements matched filtering in range direction [8,9].…”