Coherent detection method for maneuvering target with complex motions

Abstract

In this study, a coherent detection method is proposed to solve the problems during the coherent integration (CI) process, including the range cell migration (RCM) and Doppler spread (DS) effects which are caused by the complex motions of the maneuvering target. Particularly, this method applies the third-order keystone transform firstly, which could remove the third-order RCM induced by the jerk motion. Then target's defined velocity can be estimated by performing the frequency-shifting cross-correlation function and scaled Fourier transform. Thereafter, utilising the estimated defined velocity to construct a velocity compensation function, which could correct the first-order RCM (FRCM). Subsequently, the matched filtering process is performed to eliminate the second-order RCM and DS effects. Finally, applying the Fourier transform with respect to the slow time to realise the CI.

Keywords

• target tracking
• matched filters
• radar imaging
• fourier transforms
• synthetic aperture radar
• transforms
• third-order rcm
• jerk motion
• frequency-shifting cross-correlation function
• estimated defined velocity
• velocity compensation function
• first-order rcm
• ci
• coherent detection method
• maneuvering target
• complex motions
• coherent integration process
• third-order keystone