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The tracing radar signal processing with multiple target range and Doppler superresolution

Keywords:

D.S. Grigoryan – Ph.D. (Eng.), professor MA AAD AF RF. E-mail: dan-grigoryan@yandex.ru S.A. Klimov – Ph.D. (Eng.), associate professor, doctoral candidate, MA AAD AF RF. E-mail: zuk_house@rambler.ru D.G. Mitrofanov – Ph.Dr.Sci. (Eng.), senior research associate, MA AAD AF RF. E-mail: mdgvapvo@yandex.ru A.G. Prohorkin – Ph.D. (Eng.), doctoral candidate, MESC «CA AF RF». E-mail: prohorkin@yandex.ru


Now the various directions of development of signals processing methods with superperresolution were created. Great popularity autoregression methods of the digital spectral analysis which important property is superresolution of several harmonious functions which have been set in the form of spatial, temporary or frequency counting today use. One of the developing directions should consider the autoregression spectral analysis with coherent methods of preliminary data processing at the heart of which autoregression parametrical methods of the theory of the multichannel analysis lie. Results of theoretical researches and modeling speak about possibility of application of the digital spectral analysis methods with superperresolution for a number of radar-tracking tasks. Nevertheless, there are the various difficulties connected with distortions of signals in transmit-receive paths of radars, influence of a spreading surface etc. The purpose of work is research of operability of the digital spectral analysis methods with superperresolution on speed and range on the basis of the signals reflected processing from a pair air target, accompanied by the real radar in coherent-pulse and pulse-Doppler operating modes. The main objective of work consists in receiving spectral estimates with superperresolution of the targets on Dopler’s frequency in a mode of quasi-continuous radiation and on range in a mode of radiation of chirp signal with linear frequency modulation. Results of radio signals processing show that the tracking radar provides superperresolution of two targets at the total signal/noise ratio over 40 dB. Artificial deterioration of the signal/noise ratio by addition of noise to a real signal shows the bottom limit of 18 dB for the same conditions. The greatest problem on a way of the targets practical superperresolution consisted in distortions of chirp signals in the transmitting path of radar, being shown in the form of reduction of amplitude of an impulse on average frequencies of deviation. A consequence of it was modulation of a chirp signal range because of what the compressed signal had strong lateral components. The main conclusion is that for effective superperresolution of the targets on a from single chirp signal pulse it is necessary to have the rectangular probing pulse which amplitude isn't distorted, i.e. there was no additional peak modulation.
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