Analysis of Information Acquisition Ability for Chirp Signal

The time bandwidth product (TBP) of Chirp signal has experienced a sustainable growth over the past decades. However, whether to increase TBP can improve information acquisition ability of the interested targets needs to be analyzed. To this end, the relationship between information acquisition and TBP is derived for Chirp signal. Firstly, a quantitative metric for evaluating information acquisition capability is provided. Secondly, the analytical expressions of information acquisition and TBP are derived, under different target scattering models. A larger TBP indicates higher information acquisition ability with a point-like target, while there exists an optimal value of TBP for an extended target as information acquisition increases at first and then declines with the increase of TBP. Finally, numerical examples are employed to verify the theoretical analysis.