Abstract
Novel frequency domain extracted method (FDEM) to obtain high range resolution profile (HRRP) for frequency stepped synthetic aperture radar (SAR) is proposed in this paper, and the mathematical principle and formulas of this new HRRP obtaining idea combined with classical fast Fourier transform (FFT), chirp z transform (CZT), and single point Fourier transform (SPFT) are deduced, analyzed, and compared in detail. Based on the HRRP data, precision imaging processing is completed using a data block partition based fast factorized back projection algorithm. Imaging validations are executed and all results proved that the FDEM has a great capability of antijamming. It is more effective than conventional time domain IFFT method (TDM) and shows a great promise in frequency stepped radar imaging and applications.
Highlights
Apart from the classical linear frequency modulated (LFM) waveform widely used in modern radar systems, the frequency stepped waveform acts as an important kind of frequency-coded radar signal for high range resolution profile (HRRP) obtaining [1–22]
Besides providing the ability of synthesizing high resolution range profiles, which improves the range accuracy, reduces the amount of clutter within resolution cell, reduces multipath, and provides HRRP and aids in target classification, it can make targets become visible above the residual clutter and noise along with clutter cancellation, which plays an important role in the detection of low radar cross section (RCS) targets embedded in ambience noise
Conventional HRRP synthesis method is based on time domain inverse fast Fourier transform (IFFT) on data sequence sampled in each burst, which is denoted by time domain IFFT method (TDM) for short in the following
Summary
Apart from the classical linear frequency modulated (LFM) waveform widely used in modern radar systems, the frequency stepped waveform acts as an important kind of frequency-coded radar signal for high range resolution profile (HRRP) obtaining [1–22]. The fine range resolution capability of frequency stepped radar is being exploited to solve the difficult problem of detection of high-speed, low-RCS targets in the presence of large clutter. This class of problems includes detection of cruise missiles, sea skimming antiship missiles, and stealth aircraft. The receiver bandwidth is much smaller, resulting in lower noise bandwidth and a higher signalto-noise ratio (SNR) Another important but less obvious advantage of frequency stepped radar is the rejection of multiple components around clutter, which can be quite large for high-PRF waveforms.
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