Research on ISAR Imaging Algorithm of a Certain Type of Shipborne Aircraft

ISAR imaging technology has become an important tool in fields such as military reconnaissance, earth observation, and disaster monitoring, as it can provide high-resolution two-dimensional images of targets. However, due to the complex motion of targets, traditional ISAR imaging methods often result in blurred and distorted images. The Range-Doppler (RD) algorithm, by performing a two-dimensional Fourier transform on radar echo data, can effectively suppress the impact of the target’s complex motion on the ISAR image, thereby obtaining clearer and more accurate images. However, the RD algorithm has limitations in handling target acceleration and micro-movement. This paper first explains the imaging principle of ISAR, introduces envelope alignment in motion compensation, and, on this basis, proposes an improved envelope alignment method. This method was verified through the imaging of a certain satellite, proving its applicability and flexibility. Applying the improved envelope alignment method to the imaging of a certain type of shipborne aircraft, it was found that this method can effectively improve the quality and resolution of ISAR images.