Выпуск 4(10), 2017

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Zh. T. Erdyneev, A. A. Geltser, E. P. Velikanova, N. V. Panokin

COMPARATIVE ANALYSIS OF FREQUENCY SCALING
ALGORITHMS FOR SIGNAL PROCESSING IN SMALL-SIZE MOBILE
PLATFORMS

Data of reciept 22.09.2017
Decision on publication 26.10.2017

Introduction. With the development of hardware and computer systems, which im-
prove qualitative characteristics of synthetic aperture radars, with their dimensions limited,
many new systems have appeared that allow using more accessible and widespread mobile
platforms such as a car, quadcopters, unmanned aerial vehicles (UAV).
Problem. The use of new types of platforms leads to additional distortions associated
with features of the geometry of the radar performance and more severe trajectory instabili-
ties. Thus, new synthetic aperture radar systems should have special requirements for both
software and hardware, which differ from classical systems.
Objective. The aim of the work is the comparison various algorithms that are used in
modern radiovision systems to obtain high-quality radar images that can be integrated into
various kinds of mobile platforms.
Methods. The method of frequency scaling and various modifications of this method
are taken as a basic algorithm, including additional algorithms for compensating trajectory
instabilities. For comparison of algorithms, the system geometry for automobiles and aircraft
systems are considered and simulations were performed with the presence of point reflectors
at different distances and the distortion of the platform motion.
Results. The difference of the considered algorithms in the form of flowcharts and
mathematical formulas is shown. Based on results of the simulation the use of the basic fre-
quency scaling algorithm at distances corresponding to the geometry of the automobile sys-
tem leads to the distortion of the response along the azimuth. In addition, the use of the modi-
fied algorithm for compensating trajectory distortion allows correct focusing the targets at dif-
ferent distances.
Conclusion. The proposed combination of modified algorithms of trajectory distortion
and frequency scaling allows focusing the image evenly throughout the frame and improving
the quality of the image in the near zone.

Аutomobile, UAV, radiovision, radiolocation image (RLI), synthetic aperture radars
(SAR), frequency modulated continuous wave (FMCW), frequency scaling algorithm (FSA).

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