PROJECT TITLE :

Wideband distributed coherent aperture radar based on stepped frequency signal: theory and experimental results

ABSTRACT:

As the next generation radar, although the distributed coherent aperture radar (DCAR) has been proposed and a few basic works have been developed in recent years, this new radar technology has not been researched systematically. In this study, the concept and closed-loop workflow of DCAR are described intimately first. Then, the coherent parameters (CPs), that play an necessary role to understand full coherence in DCAR, are estimated based on orthogonal signal and coherent signal. To investigate the boundaries of estimation accuracy of CPs, the Cramer-Rao lower bounds are derived. The estimation values of CPs are filtered using Kalman filter to boost the estimation accuracy. In the subsequent, the wideband full coherence technology based on stepped frequency signal is proposed to improve system robustness to time synchronisation error, that makes the DCAR technology additional realisable in engineering. Furthermore, a grating lobe suppression technique primarily based on modified genetic algorithm in synthetic array pattern of DCAR is presented. Ultimately, the experiments are disbursed using test system to verify the speculation of wideband DCAR.