The Research Of Azimuth Super-resolution Based On Deconvolution

The technology of target identification is an important aspect for the developmentof modern radar, target identification of radar requires high resolution of radar’s antenna.The azimuth resolution of radar must be advanced with the rapid increase of rangeresolution in order to avoid the mismatching between the range resolution and theazimuth resolution. The problem inherent in the blind area of radar system exists intechnology of synthetic aperture and Doppler beam sharpening. Generally speaking，theazimuth resolution of real aperture radar is restricted by the antenna beam width, it isdifficult to be changed in the hardware. It is becoming more and more important toimprove the azimuth resolution from the aspect of the signal processing with thereceived echo.The technology of radar azimuth super resolution mainly refers to identify theseveral isometric targets in the same beam from the azimuth without changing thehardware of radar’s system. The method of beam sharpening is used to improve theradar azimuth resolution from the perspective of signal processing, at the same time,this article research the factors affecting the azimuth resolution, realizing the highresolution in the target recognition. The main contents are as follows.The basic model of deconvolution is set up on the basic principle of deconvolution.The system about forming radar’s echo has some related physical parameters, such asthe antenna pattern functions and noise modeling. It has an introduction about syntheticaperture technique and Doppler beam sharpening techniques which are widely used inthe modern times. A new technology Scanned Time/Angle Correlation was put forwardin recent years.Basic on the deconvolution model of the time-domain, the algorithm of generalizedinverse filtering which can be realized by linear convolution and circular convolutionrespectively is in order to realize azimuth super resolution in the time domain. Beamsharpening is realized and azimuth resolution is improved, which is certificated by theresult of simulation.Basic on the deconvolution model of the frequency-domain, the algorithm of wiener filtering and wiener filtering after window function which is not the same withthe different value types of antenna pattern can improve the azimuth resolution, at thesame time, the simulation which is based on the two kinds of antenna pattern function isgood.The results of the simulation prove the feasibility and effectiveness of theseapproaches, generalized inverse filtering, wiener filtering and wiener filtering withwindow function can effectively improve the azimuth resolution of radar.