NUIFFT-RFT: A Novel Coherent Accumulation Method for Frequency agile Radar

Frequency agile radar is difficult to coherently integrate the target echo signal due to amplitude and phase fluctuations caused by frequency changes. In this paper, we propose a novel signal coherent accumulation method based on Non-uniform IFFT and RFT(Radon-Fourier transform), namely NUIFFT-RFT. After exploiting RFT to compensate the movement between pulses, NUIFFT is utilized to achieve fast coherent accumulation between randomly changing frequency signals. The simulation of small volume targets shows that NUIFFT-RFT improves the accumulation performance evidently and reduces the computational complexity significantly.