E.A. Antokhin1

1 Saint Petersburg State University of Aerospace Instrumentation (St. Petersburg, Russia)

1 aearabota@yandex.ru

The technological level of analog and digital technology achieved so far makes it possible to create multifunctional integrated radio equipment. One of the functions of modern radio-technical means of observing the surrounding space is radar object recognition. The information contained in the signal reflected by the object is not fully extracted by the radar. The study of the possibility of extracting as much information as possible about the target-noise environment without significantly complicating technical means is of considerable interest. Purpose – to investigate the potential accuracy of estimating the characteristics of a spatially extended object observed by a sum-difference monopulse radar and a radar with an antenna array for radar recognition.

New expressions have been obtained for the Cramer–Rao bounds of estimates of the average power, angular coordinate, and effective angular extension of a spatially extended object observed by two types of radars. A comparison of the obtained families of dependencies of the estimated parameters on the SNR in the range of 0-30 dB at different values of the angular extension of the object shows that the nature of the dependencies of the RMS for the considered systems is identical. The region of low values of the SNR (0...15 dB) is characterized mainly by the influence of internal system noise and corresponds to the case of observing a point target. When the SNR is more than 15dB, the dependence of the RMS is stabilized, which is explained by the fact that measurement errors are determined only by the amplitude and angular noise of the object itself. An increase in the extension of an object is accompanied by an increase in the RMS. Practical relevance – estimates of the parameters of a spatially extended target can be used for radar recognition in multi-position surveillance systems, the components of which are radars of various types.

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