Influence Of The Displacement Effect
On Compressed LFM Signal Parameters
Author(s)
A. Kawalec, Cz. Leśnik, W. Komorniczak, W. Czarnecki
& J. Pietrasiński
Abstract
This paper deals with the digital signal processing in the application of a modern
radar receiver. The influence of the signal discretization and its side effects on
radar performance are considered. In particular, the paper presents the problem
of the random displacement effect of LFM (linear frequency modulation) radar
echo pulse beginning in accordance with the closest discrete time value. This
effect has an impact on the characteristics of the pulse compression filter output
signal. Its equivalence to the Doppler frequency shift has also been proven. The
shift is responsible for additional, unwanted amplitude modulation of the signal
samples on the output of the matched filter, as a result of the discretization
process. The resulting losses of the signal level (LPG) can reach 4dB. The losses
follow the function of the sampling frequency, whose relation has been
developed. In addition, the displacement effect can significantly decrease the
effectiveness of the MTI process.
In the paper it has been shown that the influence of the displacement effect
and discretization process on the relative level of the side lobes is not significant.
The losses of PSL (Peak Side-lobe Level) do not exceed a fraction of dB.
Characteristics evaluation of the discretization process has been performed on
the basis of the proposed discrete time generation algorithm. The testing results
are shown, as well as a discussion and some practical conclusions.
Keywords: signal processing, linear frequency modulation, radar signal,
ambiguity function, signal discretization.
Keywords
signal processing, linear frequency modulation, radar signal,
ambiguity function, signal discretization.
Related Book
Other papers in this volume
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