Signal analysis of bistatic arc array SAR data with an accelerated moving transmitter

Abstract

In the bistatic arc array synthetic aperture radar (AA-BiSAR) with a moving transmitter, the moving transmitter is helpful to improve the flexibility of the imaging system and expand the imaging scene, which has important significance in the field of helicopter assisted landing, emergency rescue and so on. The motion state of the transmitter is closely related to the bistatic arc array SAR echo model and imaging quality. This article establishes the echo signal model under accelerated motion, analyzes the impact of acceleration on echo phase and imaging quality, studies the effect of different accelerations on the approximate expansion phase error of slant range, and provides relevant analysis results through point target simulation experiments. The analysis results have a certain guiding significance for the follow-up moving transmitter bistatic arc array SAR high-precision and accurate imaging and motion error compensation.