UDC 623.62
The method of determining the mutual time delay
of radar signals with continuous frequency-modulated radiation at the points of
reception of the difference-ranging system
I. F. Kupryashkin, A. V. Evlakov
Military educational and
scientific centre of Military-air forces «Military-air academy
named by prof.
N.E.Zhukovsky and Ju.A.Gagarin», Voronezh 394052,
Russia
The
paper s received on January 26, 2019, after correction – on March 25, 2019
Abstract.
The paper
proposes a method for determination of mutual time delay of signals in the radar
with continuous linear frequency modulated radiation in a differential ranging
measuring system. The method is based on transmission of received signals,
converting to digital form with small number of quantization levels, from
reception points to a processing point. The peculiarity of the method is
pre-filtering of the received signal in the frequency band of a width not
exceeding 10 percent of the total width of the signal spectrum. This ensures its
conversion from continuous form to pulse, and also reduces the bandwidth
requirements of data channels at ten times and more. Another peculiarity of the
method is the use of properties of linear frequency modulation signals in the
evaluation of their mutual time shift. It is to replace the procedure for
calculating their mutual correlation function with a significantly more
productive combination of their multiplication procedure with the fast Fourier
transform followed. It is shown that even if the signal-to-noise ratio is less
than minus 10 decibels, the two quantization levels and the transmission of only
a part of the frequency band (less than 3%), the mean square error of the radar
carrier location is not more than a few tens of meters.
Keywords: different-distance
method, electronic intelligence, determination of location.
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