Information Acquisition Ability of LFMW for SAR

Abstract

The classical linear frequency modulated waveform (LFMW) for synthetic aperture radar (SAR) can achieve a high range resolution and a superior signal-to-noise ratio (SNR) for point targets. Therefore, numerous researches got increasingly passionate about increasing resolution and SNR, rather than information acquisition of LFMW. This paper quantitatively analyzes and evaluates target information acquisition ability of LFMW, which is conducive to target perception. Firstly, a factor contributing to information acquisition of LFMW, is obtained under the discretized signal model. Secondly, a connection between LFMW and eigenvectors of target feature matrix is derived through the discrete Fourier bases, thus the information acquisition of LFWM is presented. Finally, the numerical simulations are made for the stochastic extended targets information acquisition of LFMW, and the results are employed to verify the theory analysis.